threads / patch / 26077

patch, 4 partsdiff.c: pass struct diff_words into find_word_boundaries

Subject: [PATCH 1/4] diff.c: pass struct diff_words into find_word_boundaries

## tl;dr

23 messages between Dec 15, 2010 and Jan 18, 2011. Diffs are folded; open one to read it.

replies: 22people: 4as markdown or json

Thomas Rast· Dec 15, 2010, 15:13 UTC · lore

[PATCH 0/4] --word-regex sanity checking and such

[Forgot the list and Matthijs on the first sending. Sorry for the spam!]

Scott Johnson wrote [trimmed and wraps fixed up]:

Show 16 quoted lines

> Here's the default `git diff --word-diff`:
>         [-<li class="yws-maps"><em></em><a-]{+<li><em></em><a+} href="#">yws-maps</a></li>
>         [-<li class="ydn-delicious"><em></em><a-]{+<li><em></em><a+} href="#">ydn-delicious</a></li>
> 
> Which is correct, but less than ideal because it highlights much more than the 
> actual changes.
> 
> So I create a .gitattributes file with one line:
> *.html diff=html
> 
> And rerun `git diff --word-diff`:
>         <li[-class="yws-maps"-]><em></em><a href="#">yws-maps</a></li>
>         <li><em></em><a href="#">ydn-delicious</a></li>
> 
> Yikes! What happened to the second line of changes? The removed code is not 
> displayed at all.

Michael J Gruber wrote:

> Yep, I just found out myself experimenting with a wordRegex for csv.
> Seems like quite a "Gimme rope" feature...
> 
> So, it's the regex.

Well. Yes. No. Maybe.

Thanks for bringing this to my attention. I currently have enough more serious work to avoid that this actually motivated me to hack up a sanity check. It's just far too error prone as it is now.

But I cannot reproduce the problem! I put Scott's two offending lines (taken from his "straight" diff) into t4034/html/{pre,post}, and I think the output is valid. Also, the word regex for html has long included the |[^[:space:]] safeguard (actually they all do except for bibtex, which is even more lenient on what it matches). So you either found an example that depends on more context (which would be *really* bad) or there is another source of bad regexes. Anyway, the safeguard should easily catch the latter case.

This did unearth a bug in the ruby regex, though, so it's been worth the trouble.

Various small issues with this patch series:

* [4/4] I stole the html test from Scott's mail, and some of the rest
  from various Wikibooks sources on "Hello World" in each language,
  usually extended by a bit of code that tests the world-splitting
  power.  I hope this is ok with Scott and the Copyright overlords.
  There are only so many ways to spell "Hello World", and only so many
  languages I know myself.

* [4/4] Many patterns do not split 1+2, probably because they stick +2
  together as a signed integer literal, even though I think they
  should.  I ran out of time to investigate however.

* [3/4] was actually detected with the help of [4/4], but putting it
  after would require heavy special casing.

* [2/4] It's a weird idiosyncrasy of the word-diff code that the exit
  status of git-diff does not depend on whether word-diff found any
  differences, and in fact the shown hunks do not either.  So the
  tests are "test_must_fail" regardless of word regex, because the
  input files differ at a byte level.  Maybe at least hunks without
  word differences should be suppressed?

Thomas Rast (4):
  diff.c: pass struct diff_words into find_word_boundaries
  diff.c: implement a sanity check for word regexes
  userdiff: fix typo in ruby word regex
  t4034: bulk verify builtin word regex sanity

 Documentation/config.txt |    8 ++++
 diff.c                   |  104 +++++++++++++++++++++++++++++++++++++++++----
 diff.h                   |    1 +
 t/t4034-diff-words.sh    |   85 +++++++++++++++++++++++++++++++++++++-
 t/t4034/bibtex/expect    |   15 +++++++
 t/t4034/bibtex/post      |   10 ++++
 t/t4034/bibtex/pre       |    9 ++++
 t/t4034/cpp/expect       |   10 ++++
 t/t4034/cpp/post         |    5 ++
 t/t4034/cpp/pre          |    4 ++
 t/t4034/csharp/expect    |   12 +++++
 t/t4034/csharp/post      |    8 ++++
 t/t4034/csharp/pre       |    8 ++++
 t/t4034/fortran/expect   |   12 +++++
 t/t4034/fortran/post     |    7 +++
 t/t4034/fortran/pre      |    7 +++
 t/t4034/html/expect      |    7 +++
 t/t4034/html/post        |    2 +
 t/t4034/html/pre         |    2 +
 t/t4034/java/expect      |   11 +++++
 t/t4034/java/post        |    6 +++
 t/t4034/java/pre         |    6 +++
 t/t4034/objc/expect      |   11 +++++
 t/t4034/objc/post        |    7 +++
 t/t4034/objc/pre         |    7 +++
 t/t4034/pascal/expect    |   12 +++++
 t/t4034/pascal/post      |    7 +++
 t/t4034/pascal/pre       |    7 +++
 t/t4034/php/expect       |    7 +++
 t/t4034/php/post         |    2 +
 t/t4034/php/pre          |    2 +
 t/t4034/python/expect    |    8 ++++
 t/t4034/python/post      |    3 +
 t/t4034/python/pre       |    3 +
 t/t4034/ruby/expect      |    7 +++
 t/t4034/ruby/post        |    2 +
 t/t4034/ruby/pre         |    2 +
 t/t4034/tex/expect       |    9 ++++
 t/t4034/tex/post         |    4 ++
 t/t4034/tex/pre          |    4 ++
 userdiff.c               |    2 +-
 41 files changed, 433 insertions(+), 12 deletions(-)
 create mode 100644 t/t4034/bibtex/expect
 create mode 100644 t/t4034/bibtex/post
 create mode 100644 t/t4034/bibtex/pre
 create mode 100644 t/t4034/cpp/expect
 create mode 100644 t/t4034/cpp/post
 create mode 100644 t/t4034/cpp/pre
 create mode 100644 t/t4034/csharp/expect
 create mode 100644 t/t4034/csharp/post
 create mode 100644 t/t4034/csharp/pre
 create mode 100644 t/t4034/fortran/expect
 create mode 100644 t/t4034/fortran/post
 create mode 100644 t/t4034/fortran/pre
 create mode 100644 t/t4034/html/expect
 create mode 100644 t/t4034/html/post
 create mode 100644 t/t4034/html/pre
 create mode 100644 t/t4034/java/expect
 create mode 100644 t/t4034/java/post
 create mode 100644 t/t4034/java/pre
 create mode 100644 t/t4034/objc/expect
 create mode 100644 t/t4034/objc/post
 create mode 100644 t/t4034/objc/pre
 create mode 100644 t/t4034/pascal/expect
 create mode 100644 t/t4034/pascal/post
 create mode 100644 t/t4034/pascal/pre
 create mode 100644 t/t4034/php/expect
 create mode 100644 t/t4034/php/post
 create mode 100644 t/t4034/php/pre
 create mode 100644 t/t4034/python/expect
 create mode 100644 t/t4034/python/post
 create mode 100644 t/t4034/python/pre
 create mode 100644 t/t4034/ruby/expect
 create mode 100644 t/t4034/ruby/post
 create mode 100644 t/t4034/ruby/pre
 create mode 100644 t/t4034/tex/expect
 create mode 100644 t/t4034/tex/post
 create mode 100644 t/t4034/tex/pre

-- 
1.7.3.3.807.g6ee1f

Thomas Rast· Dec 15, 2010, 15:13 UTC · re: Thomas Rast · lore

We need the word_regex_check member. Instead of adding another argument, just pass in the whole struct for future extensibility.

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
---
 diff.c |   11 ++++++-----
 1 files changed, 6 insertions(+), 5 deletions(-)

Show changes to diff.c +6 −5

diff --git a/diff.c b/diff.c
index a16ce69..8758a51 100644
--- a/diff.c
+++ b/diff.c
@@ -778,12 +778,13 @@ static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
 }
 
 /* This function starts looking at *begin, and returns 0 iff a word was found. */
-static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
+static int find_word_boundaries(mmfile_t *buffer, struct diff_words_data *diff_words,
 		int *begin, int *end)
 {
-	if (word_regex && *begin < buffer->size) {
+	if (diff_words->word_regex && *begin < buffer->size) {
 		regmatch_t match[1];
-		if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
+		if (!regexec(diff_words->word_regex, buffer->ptr + *begin,
+			     1, match, 0)) {
 			char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
 					'\n', match[0].rm_eo - match[0].rm_so);
 			*end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
@@ -813,7 +814,7 @@ static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
  * in buffer->orig.
  */
 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
-		regex_t *word_regex)
+		struct diff_words_data *diff_words)
 {
 	int i, j;
 	long alloc = 0;
@@ -827,7 +828,7 @@ static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
 	buffer->orig_nr = 1;
 
 	for (i = 0; i < buffer->text.size; i++) {
-		if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
+		if (find_word_boundaries(&buffer->text, diff_words, &i, &j))
 			return;
 
 		/* store original boundaries */

-- 
1.7.3.3.807.g6ee1f

Thomas Rast· Dec 15, 2010, 15:13 UTC · re: Thomas Rast · lore

[PATCH 2/4] diff.c: implement a sanity check for word regexes

Word regexes are a bit of a dangerous beast, since it is easily possible to not match a non-space part, which is subsequently ignored for the purposes of emitting the word diff. This was clearly stated in the docs, but users still tripped over it.

Implement a safeguard that verifies two basic sanity assumptions:

* The word regex matches anything that is !isspace().

* The word regex does not match '\n'.  (This case is not very harmful,
  but we used to silently cut off at the '\n' which may go against
  user expectations.)

This is configurable via 'diff.wordRegexCheck', and defaults to 'warn'.

Reported-by: Scott Johnson <scottj75074@yahoo.com>
Signed-off-by: Thomas Rast <trast@student.ethz.ch>
---
 Documentation/config.txt |    8 ++++
 diff.c                   |   93 +++++++++++++++++++++++++++++++++++++++++++--
 diff.h                   |    1 +
 t/t4034-diff-words.sh    |   65 +++++++++++++++++++++++++++++++-
 4 files changed, 161 insertions(+), 6 deletions(-)

Show changes to 4 files +161 −6

Documentation/config.txt, diff.c, diff.h, t/t4034-diff-words.sh

diff --git a/Documentation/config.txt b/Documentation/config.txt
index bf9479e..2e033ea 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -897,6 +897,14 @@ diff.wordRegex::
 	sequences that match the regular expression are "words", all other
 	characters are *ignorable* whitespace.
 
+diff.wordRegexCheck::
+	Perform a simple sanity check on matches of the word regex.
+	Currently this check ensures that the word regex matches all
+	non-space characters, and that the word regex does not match a
+	newline.  The setting controls what to do when the check
+	fails: 'false'/'off'/'ignore' ignore, 'true'/'on'/'warn' emit
+	a warning, and 'error' abort with an error message.
+
 fetch.recurseSubmodules::
 	A boolean value which changes the behavior for fetch and pull, the
 	default is to not recursively fetch populated sumodules unless
diff --git a/diff.c b/diff.c
index 8758a51..becefcf 100644
--- a/diff.c
+++ b/diff.c
@@ -22,11 +22,17 @@
 #define FAST_WORKING_DIRECTORY 1
 #endif
 
+#define REGEX_CHECK_UNSET -1
+#define REGEX_CHECK_OFF 0
+#define REGEX_CHECK_WARN 1
+#define REGEX_CHECK_ERROR 2
+
 static int diff_detect_rename_default;
 static int diff_rename_limit_default = 200;
 static int diff_suppress_blank_empty;
 int diff_use_color_default = -1;
 static const char *diff_word_regex_cfg;
+static int diff_word_regex_check_cfg = REGEX_CHECK_UNSET;
 static const char *external_diff_cmd_cfg;
 int diff_auto_refresh_index = 1;
 static int diff_mnemonic_prefix;
@@ -75,6 +81,19 @@ static int git_config_rename(const char *var, const char *value)
 	return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
 }
 
+static int parse_regex_check_level(int *b, const char *k, const char *v)
+{
+	if (v && !strcasecmp(v, "ignore"))
+		*b = REGEX_CHECK_OFF;
+	else if (v && !strcasecmp(v, "warn"))
+		*b = REGEX_CHECK_WARN;
+	else if (v && !strcasecmp(v, "error"))
+		*b = REGEX_CHECK_ERROR;
+	else
+		*b = git_config_bool(k, v);
+	return 1;
+}
+
 /*
  * These are to give UI layer defaults.
  * The core-level commands such as git-diff-files should
@@ -107,6 +126,8 @@ int git_diff_ui_config(const char *var, const char *value, void *cb)
 		return git_config_string(&external_diff_cmd_cfg, var, value);
 	if (!strcmp(var, "diff.wordregex"))
 		return git_config_string(&diff_word_regex_cfg, var, value);
+	if (!strcmp(var, "diff.wordregexcheck"))
+		return parse_regex_check_level(&diff_word_regex_check_cfg, var, value);
 
 	if (!strcmp(var, "diff.ignoresubmodules"))
 		handle_ignore_submodules_arg(&default_diff_options, value);
@@ -777,6 +798,50 @@ static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
 	diff_words->last_minus = minus_first;
 }
 
+
+static void check_word_regex_match(struct diff_words_data *diff_words,
+		char *start, int len, int unmatched)
+{
+	int check = diff_words->opt->word_regex_check;
+	void (*report_fn)(const char *, ...);
+
+	if (check == REGEX_CHECK_OFF)
+		return;
+
+	if (check == REGEX_CHECK_WARN)
+		report_fn = warning;
+	else if (check == REGEX_CHECK_ERROR)
+		report_fn = die;
+	else
+		assert(!"expected REGEX_CHECK_WARN or _ERROR");
+
+	if (unmatched) {
+		int i;
+		char *match_str;
+		for (i = 0; i < len; i++) {
+			if (isspace(start[i]))
+				continue;
+			match_str = xmemdupz(start, len);
+			report_fn("The following snippet contains non-space "
+				  "characters, but was not\nmatched by the "
+				  "word regex:\n'%s'\n"
+				  "They would be ignored for the purposes of "
+				  "the diff, which is\nusually not what you want.",
+				  match_str);
+			free(match_str);
+			break;
+		}
+	} else {
+		if (memchr(start, '\n', len)) {
+			char *match_str = xmemdupz(start, len);
+			report_fn("The following word regex match contains a newline "
+				  "and will be truncated there:\n'%s'",
+				  match_str);
+			free(match_str);
+		}
+	}
+}
+
 /* This function starts looking at *begin, and returns 0 iff a word was found. */
 static int find_word_boundaries(mmfile_t *buffer, struct diff_words_data *diff_words,
 		int *begin, int *end)
@@ -785,8 +850,15 @@ static int find_word_boundaries(mmfile_t *buffer, struct diff_words_data *diff_w
 		regmatch_t match[1];
 		if (!regexec(diff_words->word_regex, buffer->ptr + *begin,
 			     1, match, 0)) {
-			char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
-					'\n', match[0].rm_eo - match[0].rm_so);
+			char *prev_start = buffer->ptr + *begin;
+			char *match_start = prev_start + match[0].rm_so;
+			int match_len = match[0].rm_eo - match[0].rm_so;
+			char *p;
+			check_word_regex_match(diff_words, prev_start,
+					       match_start-prev_start, 1);
+			check_word_regex_match(diff_words, match_start,
+					       match_len, 0);
+			p = memchr(match_start, '\n', match_len);
 			*end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
 			*begin += match[0].rm_so;
 			return *begin >= *end;
@@ -829,7 +901,7 @@ static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
 
 	for (i = 0; i < buffer->text.size; i++) {
 		if (find_word_boundaries(&buffer->text, diff_words, &i, &j))
-			return;
+			break;
 
 		/* store original boundaries */
 		ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
@@ -846,6 +918,11 @@ static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
 
 		i = j - 1;
 	}
+
+	/* no more boundaries, check any non-matched chunk remaining */
+	if (i < buffer->text.size)
+		check_word_regex_match(diff_words, buffer->text.ptr + i,
+				       buffer->text.size-i, 1);
 }
 
 /* this executes the word diff on the accumulated buffers */
@@ -882,8 +959,8 @@ static void diff_words_show(struct diff_words_data *diff_words)
 
 	memset(&xpp, 0, sizeof(xpp));
 	memset(&xecfg, 0, sizeof(xecfg));
-	diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
-	diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
+	diff_words_fill(&diff_words->minus, &minus, diff_words);
+	diff_words_fill(&diff_words->plus, &plus, diff_words);
 	xpp.flags = 0;
 	/* as only the hunk header will be parsed, we need a 0-context */
 	xecfg.ctxlen = 0;
@@ -2021,6 +2098,10 @@ static void builtin_diff(const char *name_a,
 				o->word_regex = userdiff_word_regex(two);
 			if (!o->word_regex)
 				o->word_regex = diff_word_regex_cfg;
+			if (o->word_regex_check == REGEX_CHECK_UNSET)
+				o->word_regex_check = diff_word_regex_check_cfg;
+			if (o->word_regex_check == REGEX_CHECK_UNSET)
+				o->word_regex_check = REGEX_CHECK_WARN;
 			if (o->word_regex) {
 				ecbdata.diff_words->word_regex = (regex_t *)
 					xmalloc(sizeof(regex_t));
@@ -2861,6 +2942,8 @@ void diff_setup(struct diff_options *options)
 		options->a_prefix = "a/";
 		options->b_prefix = "b/";
 	}
+
+	options->word_regex_check = REGEX_CHECK_UNSET;
 }
 
 int diff_setup_done(struct diff_options *options)
diff --git a/diff.h b/diff.h
index 165f368..5f6a7be 100644
--- a/diff.h
+++ b/diff.h
@@ -123,6 +123,7 @@ struct diff_options {
 	int stat_width;
 	int stat_name_width;
 	const char *word_regex;
+	int word_regex_check;
 	enum diff_words_type word_diff;
 
 	/* this is set by diffcore for DIFF_FORMAT_PATCH */
diff --git a/t/t4034-diff-words.sh b/t/t4034-diff-words.sh
index 8096d8a..ebe72ce 100755
--- a/t/t4034-diff-words.sh
+++ b/t/t4034-diff-words.sh
@@ -8,7 +8,8 @@ test_expect_success setup '
 
 	git config diff.color.old red &&
 	git config diff.color.new green &&
-	git config diff.color.func magenta
+	git config diff.color.func magenta &&
+	git config diff.wordRegexCheck off
 
 '
 
@@ -331,4 +332,66 @@ test_expect_success '--word-diff=none' '
 
 '
 
+echo abcd > pre
+echo aXYd > post
+
+test_expect_success 'diff.wordRegexCheck="error" catches nonspaces' '
+
+	git config diff.wordRegexCheck error &&
+	test_must_fail git diff --no-index --word-diff-regex="a|d" pre post 2>out &&
+	grep "fatal.*contains non-space characters" out
+
+'
+
+newline="
+"
+
+test_expect_success 'diff.wordRegexCheck="error" catches newlines' '
+
+	git config diff.wordRegexCheck error &&
+	test_must_fail git diff --no-index --word-diff-regex=".|$newline" pre post 2>out &&
+	grep "fatal.*contains a newline" out
+
+'
+
+test_expect_success 'diff.wordRegexCheck="warn" works' '
+
+	git config diff.wordRegexCheck warn &&
+	test_must_fail git diff --no-index --word-diff-regex="a|d" pre post 2>out &&
+	grep "warning.*contains non-space characters" out
+
+'
+
+test_expect_success 'diff.wordRegexCheck="ignore" works' '
+
+	git config diff.wordRegexCheck ignore &&
+	test_must_fail git diff --no-index --word-diff-regex="a|d" pre post 2>out &&
+	! grep "contains non-space characters" out
+
+'
+
+test_expect_success 'diff.wordRegexCheck="false" is like "ignore"' '
+
+	git config diff.wordRegexCheck false &&
+	test_must_fail git diff --no-index --word-diff-regex="a|d" pre post 2>out &&
+	! grep "contains non-space characters" out
+
+'
+
+test_expect_success 'diff.wordRegexCheck="true" is like "warn"' '
+
+	git config diff.wordRegexCheck true &&
+	test_must_fail git diff --no-index --word-diff-regex="a|d" pre post 2>out &&
+	grep "warning.*contains non-space characters" out
+
+'
+
+test_expect_success 'diff.wordRegexCheck unset is like "warn"' '
+
+	git config --unset diff.wordRegexCheck &&
+	test_must_fail git diff --no-index --word-diff-regex="a|d" pre post 2>out &&
+	grep "warning.*contains non-space characters" out
+
+'
+
 test_done

-- 
1.7.3.3.807.g6ee1f

Thomas Rast· Dec 15, 2010, 15:13 UTC · re: Thomas Rast · lore

[PATCH 3/4] userdiff: fix typo in ruby word regex

The regex had an unclosed ] that pretty much ruined the safeguard against not matching a non-space char.

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
---
 userdiff.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

Show changes to userdiff.c +1 −1

diff --git a/userdiff.c b/userdiff.c
index f9e05b5..4d6433b 100644
--- a/userdiff.c
+++ b/userdiff.c
@@ -81,7 +81,7 @@
 	 "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
 	 "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
 	 "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"
-	 "|[^[:space:]|[\x80-\xff]+"),
+	 "|[^[:space:]]|[\x80-\xff]+"),
 PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
 	 "[={}\"]|[^={}\" \t]+"),
 PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",

-- 
1.7.3.3.807.g6ee1f

Thomas Rast· Dec 15, 2010, 15:13 UTC · re: Thomas Rast · lore

[PATCH 4/4] t4034: bulk verify builtin word regex sanity

The builtin word regexes should be tested with some simple examples against simple issues, like failing to match a non-space character.

Do this in bulk. Many of these patterns are a rather ad-hoc combination of a few simple lines of code, so they can certainly be improved. However, they already unearthed a typo in the ruby pattern (previous commit).

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
---
 t/t4034-diff-words.sh  |   20 ++++++++++++++++++++
 t/t4034/bibtex/expect  |   15 +++++++++++++++
 t/t4034/bibtex/post    |   10 ++++++++++
 t/t4034/bibtex/pre     |    9 +++++++++
 t/t4034/cpp/expect     |   10 ++++++++++
 t/t4034/cpp/post       |    5 +++++
 t/t4034/cpp/pre        |    4 ++++
 t/t4034/csharp/expect  |   12 ++++++++++++
 t/t4034/csharp/post    |    8 ++++++++
 t/t4034/csharp/pre     |    8 ++++++++
 t/t4034/fortran/expect |   12 ++++++++++++
 t/t4034/fortran/post   |    7 +++++++
 t/t4034/fortran/pre    |    7 +++++++
 t/t4034/html/expect    |    7 +++++++
 t/t4034/html/post      |    2 ++
 t/t4034/html/pre       |    2 ++
 t/t4034/java/expect    |   11 +++++++++++
 t/t4034/java/post      |    6 ++++++
 t/t4034/java/pre       |    6 ++++++
 t/t4034/objc/expect    |   11 +++++++++++
 t/t4034/objc/post      |    7 +++++++
 t/t4034/objc/pre       |    7 +++++++
 t/t4034/pascal/expect  |   12 ++++++++++++
 t/t4034/pascal/post    |    7 +++++++
 t/t4034/pascal/pre     |    7 +++++++
 t/t4034/php/expect     |    7 +++++++
 t/t4034/php/post       |    2 ++
 t/t4034/php/pre        |    2 ++
 t/t4034/python/expect  |    8 ++++++++
 t/t4034/python/post    |    3 +++
 t/t4034/python/pre     |    3 +++
 t/t4034/ruby/expect    |    7 +++++++
 t/t4034/ruby/post      |    2 ++
 t/t4034/ruby/pre       |    2 ++
 t/t4034/tex/expect     |    9 +++++++++
 t/t4034/tex/post       |    4 ++++
 t/t4034/tex/pre        |    4 ++++
 37 files changed, 265 insertions(+), 0 deletions(-)
 create mode 100644 t/t4034/bibtex/expect
 create mode 100644 t/t4034/bibtex/post
 create mode 100644 t/t4034/bibtex/pre
 create mode 100644 t/t4034/cpp/expect
 create mode 100644 t/t4034/cpp/post
 create mode 100644 t/t4034/cpp/pre
 create mode 100644 t/t4034/csharp/expect
 create mode 100644 t/t4034/csharp/post
 create mode 100644 t/t4034/csharp/pre
 create mode 100644 t/t4034/fortran/expect
 create mode 100644 t/t4034/fortran/post
 create mode 100644 t/t4034/fortran/pre
 create mode 100644 t/t4034/html/expect
 create mode 100644 t/t4034/html/post
 create mode 100644 t/t4034/html/pre
 create mode 100644 t/t4034/java/expect
 create mode 100644 t/t4034/java/post
 create mode 100644 t/t4034/java/pre
 create mode 100644 t/t4034/objc/expect
 create mode 100644 t/t4034/objc/post
 create mode 100644 t/t4034/objc/pre
 create mode 100644 t/t4034/pascal/expect
 create mode 100644 t/t4034/pascal/post
 create mode 100644 t/t4034/pascal/pre
 create mode 100644 t/t4034/php/expect
 create mode 100644 t/t4034/php/post
 create mode 100644 t/t4034/php/pre
 create mode 100644 t/t4034/python/expect
 create mode 100644 t/t4034/python/post
 create mode 100644 t/t4034/python/pre
 create mode 100644 t/t4034/ruby/expect
 create mode 100644 t/t4034/ruby/post
 create mode 100644 t/t4034/ruby/pre
 create mode 100644 t/t4034/tex/expect
 create mode 100644 t/t4034/tex/post
 create mode 100644 t/t4034/tex/pre

Show changes to 37 files +265 −0

t/t4034-diff-words.sh, t/t4034/bibtex/expect, t/t4034/bibtex/post, t/t4034/bibtex/pre, t/t4034/cpp/expect, t/t4034/cpp/post, t/t4034/cpp/pre, t/t4034/csharp/expect, t/t4034/csharp/post, t/t4034/csharp/pre, t/t4034/fortran/expect, t/t4034/fortran/post, t/t4034/fortran/pre, t/t4034/html/expect, t/t4034/html/post, t/t4034/html/pre, t/t4034/java/expect, t/t4034/java/post, t/t4034/java/pre, t/t4034/objc/expect, t/t4034/objc/post, t/t4034/objc/pre, t/t4034/pascal/expect, t/t4034/pascal/post, t/t4034/pascal/pre, t/t4034/php/expect, t/t4034/php/post, t/t4034/php/pre, t/t4034/python/expect, t/t4034/python/post, t/t4034/python/pre, t/t4034/ruby/expect, t/t4034/ruby/post, t/t4034/ruby/pre, t/t4034/tex/expect, t/t4034/tex/post, t/t4034/tex/pre

diff --git a/t/t4034-diff-words.sh b/t/t4034-diff-words.sh
index ebe72ce..b085948 100755
--- a/t/t4034-diff-words.sh
+++ b/t/t4034-diff-words.sh
@@ -394,4 +394,24 @@ test_expect_success 'diff.wordRegexCheck unset is like "warn"' '
 
 '
 
+test_expect_success 'set diff.wordRegexCheck=error for language tests' '
+
+	git config diff.wordRegexCheck error
+
+'
+
+word_diff_for_language () {
+	cp $TEST_DIRECTORY/t4034/$1/pre $TEST_DIRECTORY/t4034/$1/post \
+		$TEST_DIRECTORY/t4034/$1/expect . &&
+	echo "* diff=$1" > .gitattributes &&
+	word_diff --color-words
+}
+
+for lang_dir in $TEST_DIRECTORY/t4034/*; do
+	lang=${lang_dir#$TEST_DIRECTORY/t4034/}
+	test_expect_success "diff driver '$lang' has sane word regex" "
+		word_diff_for_language $lang
+	"
+done
+
 test_done
diff --git a/t/t4034/bibtex/expect b/t/t4034/bibtex/expect
new file mode 100644
index 0000000..a157774
--- /dev/null
+++ b/t/t4034/bibtex/expect
@@ -0,0 +1,15 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 95cd55b..ddcba9b 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,9 +1,10 @@<RESET>
+@article{aldous1987uie,<RESET>
+  title={{Ultimate instability of exponential back-off protocol for acknowledgment-based transmission control of random access communication channels}},<RESET>
+  author={Aldous, <RED>D.<RESET><GREEN>David<RESET>},
+  journal={Information Theory, IEEE Transactions on},<RESET>
+  volume={<RED>33<RESET><GREEN>Bogus.<RESET>},
+  number={<RED>2<RESET><GREEN>4<RESET>},
+  pages={219--223},<RESET>
+  year=<GREEN>1987,<RESET>
+<GREEN>  note={This is in fact a rather funny read since ethernet works well in practice. The<RESET> {<RED>1987<RESET><GREEN>\em pre} reference is the right one, however.<RESET>}<RED>,<RESET>
+}<RESET>
diff --git a/t/t4034/bibtex/post b/t/t4034/bibtex/post
new file mode 100644
index 0000000..ddcba9b
--- /dev/null
+++ b/t/t4034/bibtex/post
@@ -0,0 +1,10 @@
+@article{aldous1987uie,
+  title={{Ultimate instability of exponential back-off protocol for acknowledgment-based transmission control of random access communication channels}},
+  author={Aldous, David},
+  journal={Information Theory, IEEE Transactions on},
+  volume={Bogus.},
+  number={4},
+  pages={219--223},
+  year=1987,
+  note={This is in fact a rather funny read since ethernet works well in practice. The {\em pre} reference is the right one, however.}
+}
diff --git a/t/t4034/bibtex/pre b/t/t4034/bibtex/pre
new file mode 100644
index 0000000..95cd55b
--- /dev/null
+++ b/t/t4034/bibtex/pre
@@ -0,0 +1,9 @@
+@article{aldous1987uie,
+  title={{Ultimate instability of exponential back-off protocol for acknowledgment-based transmission control of random access communication channels}},
+  author={Aldous, D.},
+  journal={Information Theory, IEEE Transactions on},
+  volume={33},
+  number={2},
+  pages={219--223},
+  year={1987},
+}
diff --git a/t/t4034/cpp/expect b/t/t4034/cpp/expect
new file mode 100644
index 0000000..e529842
--- /dev/null
+++ b/t/t4034/cpp/expect
@@ -0,0 +1,10 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 5517c3c..17aa265 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,4 +1,5 @@<RESET>
+class Foo : public Thing{
+	Foo() : x(0<RED>&&1<RESET><GREEN>&42<RESET>) {
+		<GREEN>bar(x);<RESET>
+	}
+}<GREEN>;<RESET>
diff --git a/t/t4034/cpp/post b/t/t4034/cpp/post
new file mode 100644
index 0000000..17aa265
--- /dev/null
+++ b/t/t4034/cpp/post
@@ -0,0 +1,5 @@
+class Foo : public Thing{
+	Foo() : x(0&42) {
+		bar(x);
+	}
+};
diff --git a/t/t4034/cpp/pre b/t/t4034/cpp/pre
new file mode 100644
index 0000000..5517c3c
--- /dev/null
+++ b/t/t4034/cpp/pre
@@ -0,0 +1,4 @@
+class Foo:public Thing{
+	Foo():x(0&&1){}
+}
+
diff --git a/t/t4034/csharp/expect b/t/t4034/csharp/expect
new file mode 100644
index 0000000..c8b6b8f
--- /dev/null
+++ b/t/t4034/csharp/expect
@@ -0,0 +1,12 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 8ff9319..9869fa9 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -2,7 +2,7 @@<RESET> <RESET><MAGENTA>class Program<RESET>
+{<RESET>
+	static void Main()<RESET>
+	{<RESET>
+		Console.WriteLine("Hello, <GREEN>New<RESET> World!");
+		int i = <RED>5<RESET><GREEN>5+0<RESET>;
+	}<RESET>
+}<RESET>
diff --git a/t/t4034/csharp/post b/t/t4034/csharp/post
new file mode 100644
index 0000000..9869fa9
--- /dev/null
+++ b/t/t4034/csharp/post
@@ -0,0 +1,8 @@
+class Program
+{
+	static void Main()
+	{
+		Console.WriteLine("Hello, New World!");
+		int i = 5+0;
+	}
+}
diff --git a/t/t4034/csharp/pre b/t/t4034/csharp/pre
new file mode 100644
index 0000000..8ff9319
--- /dev/null
+++ b/t/t4034/csharp/pre
@@ -0,0 +1,8 @@
+class Program
+{
+	static void Main()
+	{
+		Console.WriteLine("Hello, World!");
+		int i=5;
+	}
+}
diff --git a/t/t4034/fortran/expect b/t/t4034/fortran/expect
new file mode 100644
index 0000000..5a25663
--- /dev/null
+++ b/t/t4034/fortran/expect
@@ -0,0 +1,12 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 08b4e5a..fb7cb51 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,7 +1,7 @@<RESET>
+program hello<RESET>
+   print *, "Hello World<RED>!<RESET><GREEN>?<RESET>"
+
+   DO10I = 1,10<RESET>
+   <RED>DO10I<RESET><GREEN>DO 10 I<RESET> = 1,10
+   <RED>DO10I<RESET><GREEN>DO 1 0 I<RESET> = 1,10
+end program hello<RESET>
diff --git a/t/t4034/fortran/post b/t/t4034/fortran/post
new file mode 100644
index 0000000..fb7cb51
--- /dev/null
+++ b/t/t4034/fortran/post
@@ -0,0 +1,7 @@
+program hello
+   print *, "Hello World?"
+
+   DO10I = 1,10
+   DO 10 I = 1,10
+   DO 1 0 I = 1,10
+end program hello
diff --git a/t/t4034/fortran/pre b/t/t4034/fortran/pre
new file mode 100644
index 0000000..08b4e5a
--- /dev/null
+++ b/t/t4034/fortran/pre
@@ -0,0 +1,7 @@
+program hello
+   print *, "Hello World!"
+
+   DO10I = 1,10
+   DO10I = 1,10
+   DO10I = 1,10
+end program hello
diff --git a/t/t4034/html/expect b/t/t4034/html/expect
new file mode 100644
index 0000000..78d28d4
--- /dev/null
+++ b/t/t4034/html/expect
@@ -0,0 +1,7 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 8bf936a..125bdd5 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,2 +1,2 @@<RESET>
+<li<RED>class="yws-maps"<RESET>><em></em><a href="#">yws-maps</a></li>
+<li<RED>class="ydn-delicious"<RESET>><em></em><a href="#">ydn-delicious</a></li>
diff --git a/t/t4034/html/post b/t/t4034/html/post
new file mode 100644
index 0000000..125bdd5
--- /dev/null
+++ b/t/t4034/html/post
@@ -0,0 +1,2 @@
+<li><em></em><a href="#">yws-maps</a></li>
+<li><em></em><a href="#">ydn-delicious</a></li>
diff --git a/t/t4034/html/pre b/t/t4034/html/pre
new file mode 100644
index 0000000..8bf936a
--- /dev/null
+++ b/t/t4034/html/pre
@@ -0,0 +1,2 @@
+<li class="yws-maps"><em></em><a href="#">yws-maps</a></li>
+<li class="ydn-delicious"><em></em><a href="#">ydn-delicious</a></li>
diff --git a/t/t4034/java/expect b/t/t4034/java/expect
new file mode 100644
index 0000000..9d99523
--- /dev/null
+++ b/t/t4034/java/expect
@@ -0,0 +1,11 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index ae11cd3..fd61213 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,6 +1,6 @@<RESET>
+public class HelloWorld {<RESET>
+   public static void main(String[] args) {<RESET>
+       System.out.println("Hello <RED>,<RESET><GREEN>--<RESET> world!");
+       int i = <RED>1+2<RESET><GREEN>1 + 2<RESET>;
+   }<RESET>
+}<RESET>
diff --git a/t/t4034/java/post b/t/t4034/java/post
new file mode 100644
index 0000000..fd61213
--- /dev/null
+++ b/t/t4034/java/post
@@ -0,0 +1,6 @@
+public class HelloWorld {
+   public static void main(String[] args) {
+       System.out.println("Hello -- world!");
+       int i = 1 + 2;
+   }
+}
diff --git a/t/t4034/java/pre b/t/t4034/java/pre
new file mode 100644
index 0000000..ae11cd3
--- /dev/null
+++ b/t/t4034/java/pre
@@ -0,0 +1,6 @@
+public class HelloWorld {
+   public static void main(String[] args) {
+       System.out.println("Hello, world!");
+       int i = 1+2;
+   }
+}
diff --git a/t/t4034/objc/expect b/t/t4034/objc/expect
new file mode 100644
index 0000000..a29fec5
--- /dev/null
+++ b/t/t4034/objc/expect
@@ -0,0 +1,11 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 8eb298d..e728a08 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -2,6 +2,6 @@<RESET>
+ <RESET>
+int main (void)<RESET>
+{<RESET>
+	int i = <RED>1+2<RESET><GREEN>1 + 2<RESET>;
+	printf ("Hello<GREEN>, new<RESET> world!\n");
+}<RESET>
diff --git a/t/t4034/objc/post b/t/t4034/objc/post
new file mode 100644
index 0000000..e728a08
--- /dev/null
+++ b/t/t4034/objc/post
@@ -0,0 +1,7 @@
+#import <stdio.h>
+ 
+int main (void)
+{
+	int i = 1 + 2;
+	printf ("Hello, new world!\n");
+}
diff --git a/t/t4034/objc/pre b/t/t4034/objc/pre
new file mode 100644
index 0000000..8eb298d
--- /dev/null
+++ b/t/t4034/objc/pre
@@ -0,0 +1,7 @@
+#import <stdio.h>
+ 
+int main (void)
+{
+	int i = 1+2;
+	printf ("Hello world!\n");
+}
diff --git a/t/t4034/pascal/expect b/t/t4034/pascal/expect
new file mode 100644
index 0000000..10953cf
--- /dev/null
+++ b/t/t4034/pascal/expect
@@ -0,0 +1,12 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 7c5fbef..bdd5df9 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,7 +1,7 @@<RESET>
+program HelloWorld;<RESET>
+var<RESET>
+   i : integer;
+begin<RESET>
+   i = i <RED>+1<RESET><GREEN>+ 1<RESET>;
+   writeln('Hello<GREEN>, new<RESET> world!');
+end.<RESET>
diff --git a/t/t4034/pascal/post b/t/t4034/pascal/post
new file mode 100644
index 0000000..bdd5df9
--- /dev/null
+++ b/t/t4034/pascal/post
@@ -0,0 +1,7 @@
+program HelloWorld;
+var
+   i : integer;
+begin
+   i = i + 1;
+   writeln('Hello, new world!');
+end.
diff --git a/t/t4034/pascal/pre b/t/t4034/pascal/pre
new file mode 100644
index 0000000..7c5fbef
--- /dev/null
+++ b/t/t4034/pascal/pre
@@ -0,0 +1,7 @@
+program HelloWorld;
+var
+   i: integer;
+begin
+   i = i+1;
+   writeln('Hello world!');
+end.
diff --git a/t/t4034/php/expect b/t/t4034/php/expect
new file mode 100644
index 0000000..171cfd5
--- /dev/null
+++ b/t/t4034/php/expect
@@ -0,0 +1,7 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 646a13d..1b1fe22 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,2 +1,2 @@<RESET>
+$i =<RED>$i+1<RESET><GREEN>CONSTANT + 1<RESET>;
+echo "Hello, <GREEN>New<RESET> World!\n";
diff --git a/t/t4034/php/post b/t/t4034/php/post
new file mode 100644
index 0000000..1b1fe22
--- /dev/null
+++ b/t/t4034/php/post
@@ -0,0 +1,2 @@
+$i =CONSTANT + 1;
+echo "Hello, New World!\n";
diff --git a/t/t4034/php/pre b/t/t4034/php/pre
new file mode 100644
index 0000000..646a13d
--- /dev/null
+++ b/t/t4034/php/pre
@@ -0,0 +1,2 @@
+$i=$i+1;
+echo "Hello, World!\n";
diff --git a/t/t4034/python/expect b/t/t4034/python/expect
new file mode 100644
index 0000000..bf6a30b
--- /dev/null
+++ b/t/t4034/python/expect
@@ -0,0 +1,8 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 2261a37..1076af0 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,3 +1,3 @@<RESET>
+<RED>foo.bar()<RESET><GREEN>foo . bar (stuff)<RESET>
+i = <RED>i+1<RESET><GREEN>i + 1<RESET>
+print "Hello, <GREEN>New<RESET> World!\n"
diff --git a/t/t4034/python/post b/t/t4034/python/post
new file mode 100644
index 0000000..1076af0
--- /dev/null
+++ b/t/t4034/python/post
@@ -0,0 +1,3 @@
+foo . bar (stuff)
+i = i + 1
+print "Hello, New World!\n"
diff --git a/t/t4034/python/pre b/t/t4034/python/pre
new file mode 100644
index 0000000..2261a37
--- /dev/null
+++ b/t/t4034/python/pre
@@ -0,0 +1,3 @@
+foo.bar()
+i = i+1
+print "Hello, World!\n"
diff --git a/t/t4034/ruby/expect b/t/t4034/ruby/expect
new file mode 100644
index 0000000..72ff72b
--- /dev/null
+++ b/t/t4034/ruby/expect
@@ -0,0 +1,7 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 1961e79..d954376 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,2 +1,2 @@<RESET>
+10.downto(<RED>1<RESET><GREEN>2<RESET>) { |x| puts x }
+puts 'Hello <GREEN>new<RESET> world'
diff --git a/t/t4034/ruby/post b/t/t4034/ruby/post
new file mode 100644
index 0000000..d954376
--- /dev/null
+++ b/t/t4034/ruby/post
@@ -0,0 +1,2 @@
+10.downto(2) { |x| puts x }
+puts 'Hello new world'
diff --git a/t/t4034/ruby/pre b/t/t4034/ruby/pre
new file mode 100644
index 0000000..1961e79
--- /dev/null
+++ b/t/t4034/ruby/pre
@@ -0,0 +1,2 @@
+10.downto(1) {|x| puts x}
+puts 'Hello world'
diff --git a/t/t4034/tex/expect b/t/t4034/tex/expect
new file mode 100644
index 0000000..604969b
--- /dev/null
+++ b/t/t4034/tex/expect
@@ -0,0 +1,9 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 2b2dfcb..65cab61 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,4 +1,4 @@<RESET>
+\section{Something <GREEN>new<RESET>}
+<RED>\emph<RESET><GREEN>\textbf<RESET>{Macro style}
+{<RED>\em<RESET><GREEN>\bfseries<RESET> State toggle style}
+\\[<RED>1em<RESET><GREEN>1cm<RESET>]
diff --git a/t/t4034/tex/post b/t/t4034/tex/post
new file mode 100644
index 0000000..65cab61
--- /dev/null
+++ b/t/t4034/tex/post
@@ -0,0 +1,4 @@
+\section{Something new}
+\textbf{Macro style}
+{\bfseries State toggle style}
+\\[1cm]
diff --git a/t/t4034/tex/pre b/t/t4034/tex/pre
new file mode 100644
index 0000000..2b2dfcb
--- /dev/null
+++ b/t/t4034/tex/pre
@@ -0,0 +1,4 @@
+\section{Something}
+\emph{Macro style}
+{\em State toggle style}
+\\[1em]

-- 
1.7.3.3.807.g6ee1f

Thomas Rast· Dec 15, 2010, 19:51 UTC · lore

Re: [PATCH 0/4] --word-regex sanity checking and such

Scott Johnson wrote:

> I've attached a pre and post with the complete file that is showing this 
> problem. I hope you'll be able to reproduce the issue with this.

I can't reproduce.  I did this:

  $ ls -l
  total 16
  -rw-r--r-- 1 thomas users 2128 2010-12-15 20:42 post.html
  -rw-r--r-- 1 thomas users 2354 2010-12-15 20:42 pre.html
  $ echo '*.html diff=html'  >.gitattributes
  $ git diff --no-index pre.html post.html
  diff --git 1/pre.html 2/post.html
[...]
  -        <li class="ydn-patterns"><em></em><a href="#">ydn-patterns</a></li>
  -        <li class="ydn-mail"><em></em><a href="#">ydn-mail</a></li>
  -        <li class="yws-maps"><em></em><a href="#">yws-maps</a></li>
  -        <li class="ydn-delicious"><em></em><a href="#">ydn-delicious</a></li>
  -        <li class="yws-flickr"><em></em><a href="#">yws-flickr</a></li>
  -        <li class="yws-events"><em></em><a href="#">yws-events</a></li>
  +        <li><em></em><a href="#">ydn-patterns</a></li>
  +        <li><em></em><a href="#">ydn-mail</a></li>
  +        <li><em></em><a href="#">yws-maps</a></li>
  +        <li><em></em><a href="#">ydn-delicious</a></li>
  +        <li><em></em><a href="#">yws-flickr</a></li>
  +        <li><em></em><a href="#">yws-events</a></li>
         </ul>
       </div><!-- wrap -->
     </div><!-- folder_list -->
  $ git diff --word-diff --no-index pre.html post.html
  diff --git 1/pre.html 2/post.html
[...]
          <li[-class="ydn-patterns"-]><em></em><a href="#">ydn-patterns</a></li>
          <li[-class="ydn-mail"-]><em></em><a href="#">ydn-mail</a></li>
          <li[-class="yws-maps"-]><em></em><a href="#">yws-maps</a></li>
          <li[-class="ydn-delicious"-]><em></em><a href="#">ydn-delicious</a></li>
          <li[-class="yws-flickr"-]><em></em><a href="#">yws-flickr</a></li>
          <li[-class="yws-events"-]><em></em><a href="#">yws-events</a></li>
        </ul>
      </div><!-- wrap -->
    </div><!-- folder_list -->

That's running bleeding-edge git, like I always do, but the userdiff stuff hasn't changed in ages.

What does

  git config diff.html.wordregex

say on your system?

-- 
Thomas Rast
trast@{inf,student}.ethz.ch

Scott Johnson· Dec 15, 2010, 20:48 UTC · re: Thomas Rast · lore

Re: [PATCH 0/4] --word-regex sanity checking and such

Turns out to be system-dependent. I built v1.7.3.3 from source on three different boxes and only one of them is broken.

The /etc/redhat-release shows:

Broken: Fedora Core release 6 (Zod)

Correct: Red Hat Enterprise Linux WS release 4 (Nahant Update 6) Fedora release 9 (Sulphur)

So I guess that means the problem is in some library that has most likely been fixed since Fedora 6.

----- Original Message ----
From: Thomas Rast <trast@student.ethz.ch>
To: Scott Johnson <scottj75074@yahoo.com>
Cc: Michael J Gruber <git@drmicha.warpmail.net>; Matthijs Kooijman 
<matthijs@stdin.nl>; git@vger.kernel.org
Sent: Wed, December 15, 2010 11:51:14 AM
Subject: Re: [PATCH 0/4] --word-regex sanity checking and such

Scott Johnson wrote:

> I've attached a pre and post with the complete file that is showing this 
> problem. I hope you'll be able to reproduce the issue with this.

I can't reproduce.  I did this:

  $ ls -l
  total 16
  -rw-r--r-- 1 thomas users 2128 2010-12-15 20:42 post.html
  -rw-r--r-- 1 thomas users 2354 2010-12-15 20:42 pre.html
  $ echo '*.html diff=html'  >.gitattributes
  $ git diff --no-index pre.html post.html
  diff --git 1/pre.html 2/post.html
[...]
  -        <li class="ydn-patterns"><em></em><a href="#">ydn-patterns</a></li>
  -        <li class="ydn-mail"><em></em><a href="#">ydn-mail</a></li>
  -        <li class="yws-maps"><em></em><a href="#">yws-maps</a></li>
  -        <li class="ydn-delicious"><em></em><a href="#">ydn-delicious</a></li>
  -        <li class="yws-flickr"><em></em><a href="#">yws-flickr</a></li>
  -        <li class="yws-events"><em></em><a href="#">yws-events</a></li>
  +        <li><em></em><a href="#">ydn-patterns</a></li>
  +        <li><em></em><a href="#">ydn-mail</a></li>
  +        <li><em></em><a href="#">yws-maps</a></li>
  +        <li><em></em><a href="#">ydn-delicious</a></li>
  +        <li><em></em><a href="#">yws-flickr</a></li>
  +        <li><em></em><a href="#">yws-events</a></li>
         </ul>
       </div><!-- wrap -->
     </div><!-- folder_list -->
  $ git diff --word-diff --no-index pre.html post.html
  diff --git 1/pre.html 2/post.html
[...]
          <li[-class="ydn-patterns"-]><em></em><a href="#">ydn-patterns</a></li>
          <li[-class="ydn-mail"-]><em></em><a href="#">ydn-mail</a></li>
          <li[-class="yws-maps"-]><em></em><a href="#">yws-maps</a></li>
          <li[-class="ydn-delicious"-]><em></em><a 
href="#">ydn-delicious</a></li>
          <li[-class="yws-flickr"-]><em></em><a href="#">yws-flickr</a></li>
          <li[-class="yws-events"-]><em></em><a href="#">yws-events</a></li>
        </ul>
      </div><!-- wrap -->
    </div><!-- folder_list -->

That's running bleeding-edge git, like I always do, but the userdiff stuff hasn't changed in ages.

What does

  git config diff.html.wordregex

say on your system?

-- 
Thomas Rast
trast@{inf,student}.ethz.ch

Thomas Rast· Dec 18, 2010, 16:17 UTC · re: Scott Johnson · lore

[PATCH v2 0/4] --word-regex sanity checking and such

I wrote:

Show 6 quoted lines

> * [4/4] I stole the html test from Scott's mail, and some of the rest
>   from various Wikibooks sources on "Hello World" in each language,
>   usually extended by a bit of code that tests the world-splitting
>   power.  I hope this is ok with Scott and the Copyright overlords.
>   There are only so many ways to spell "Hello World", and only so many
>   languages I know myself.

I decided to play it safe, and removed these parts. In addition I extended the bulk tests to a C operator table and some forms of literals for the C-style languages so as to catch issues with non-matches. This showed that the python regex had the same typo as the ruby one. *blush*

Scott's problem still remains:

Scott Johnson wrote:

> Turns out to be system-dependent. I built v1.7.3.3 from source on three 
> different boxes and only one of them is broken.

[...]

> Fedora Core release 6 (Zod)

I briefly considered installing FC6 on a VM, but my VirtualBox is broken and I'm having a hard time finding a FC6 installation medium. Right now the only other systems I have are darwin 10.5 and RHEL5.5, and the test works on both.

So in the absence of any way of testing this, someone with a breaking system will have to investigate. I think it's worth including the series anyway, since the regexes give wrong results in the case of match failures, and we would want users to know about this.

Thomas Rast (4):
  diff.c: pass struct diff_words into find_word_boundaries
  diff.c: implement a sanity check for word regexes
  userdiff: fix typo in ruby and python word regexes
  t4034: bulk verify builtin word regex sanity

 Documentation/config.txt |    8 ++++
 diff.c                   |  104 +++++++++++++++++++++++++++++++++++++++++----
 diff.h                   |    1 +
 t/t4034-diff-words.sh    |   85 +++++++++++++++++++++++++++++++++++++-
 t/t4034/bibtex/expect    |   15 +++++++
 t/t4034/bibtex/post      |   10 ++++
 t/t4034/bibtex/pre       |    9 ++++
 t/t4034/cpp/expect       |   36 ++++++++++++++++
 t/t4034/cpp/post         |   19 ++++++++
 t/t4034/cpp/pre          |   19 ++++++++
 t/t4034/csharp/expect    |   35 +++++++++++++++
 t/t4034/csharp/post      |   18 ++++++++
 t/t4034/csharp/pre       |   18 ++++++++
 t/t4034/fortran/expect   |   10 ++++
 t/t4034/fortran/post     |    5 ++
 t/t4034/fortran/pre      |    5 ++
 t/t4034/html/expect      |    8 ++++
 t/t4034/html/post        |    3 +
 t/t4034/html/pre         |    3 +
 t/t4034/java/expect      |   36 ++++++++++++++++
 t/t4034/java/post        |   19 ++++++++
 t/t4034/java/pre         |   19 ++++++++
 t/t4034/objc/expect      |   35 +++++++++++++++
 t/t4034/objc/post        |   18 ++++++++
 t/t4034/objc/pre         |   18 ++++++++
 t/t4034/pascal/expect    |   35 +++++++++++++++
 t/t4034/pascal/post      |   18 ++++++++
 t/t4034/pascal/pre       |   18 ++++++++
 t/t4034/php/expect       |   35 +++++++++++++++
 t/t4034/php/post         |   18 ++++++++
 t/t4034/php/pre          |   18 ++++++++
 t/t4034/python/expect    |   34 +++++++++++++++
 t/t4034/python/post      |   17 +++++++
 t/t4034/python/pre       |   17 +++++++
 t/t4034/ruby/expect      |   34 +++++++++++++++
 t/t4034/ruby/post        |   17 +++++++
 t/t4034/ruby/pre         |   17 +++++++
 t/t4034/tex/expect       |    9 ++++
 t/t4034/tex/post         |    4 ++
 t/t4034/tex/pre          |    4 ++
 userdiff.c               |    4 +-
 41 files changed, 842 insertions(+), 13 deletions(-)
 create mode 100644 t/t4034/bibtex/expect
 create mode 100644 t/t4034/bibtex/post
 create mode 100644 t/t4034/bibtex/pre
 create mode 100644 t/t4034/cpp/expect
 create mode 100644 t/t4034/cpp/post
 create mode 100644 t/t4034/cpp/pre
 create mode 100644 t/t4034/csharp/expect
 create mode 100644 t/t4034/csharp/post
 create mode 100644 t/t4034/csharp/pre
 create mode 100644 t/t4034/fortran/expect
 create mode 100644 t/t4034/fortran/post
 create mode 100644 t/t4034/fortran/pre
 create mode 100644 t/t4034/html/expect
 create mode 100644 t/t4034/html/post
 create mode 100644 t/t4034/html/pre
 create mode 100644 t/t4034/java/expect
 create mode 100644 t/t4034/java/post
 create mode 100644 t/t4034/java/pre
 create mode 100644 t/t4034/objc/expect
 create mode 100644 t/t4034/objc/post
 create mode 100644 t/t4034/objc/pre
 create mode 100644 t/t4034/pascal/expect
 create mode 100644 t/t4034/pascal/post
 create mode 100644 t/t4034/pascal/pre
 create mode 100644 t/t4034/php/expect
 create mode 100644 t/t4034/php/post
 create mode 100644 t/t4034/php/pre
 create mode 100644 t/t4034/python/expect
 create mode 100644 t/t4034/python/post
 create mode 100644 t/t4034/python/pre
 create mode 100644 t/t4034/ruby/expect
 create mode 100644 t/t4034/ruby/post
 create mode 100644 t/t4034/ruby/pre
 create mode 100644 t/t4034/tex/expect
 create mode 100644 t/t4034/tex/post
 create mode 100644 t/t4034/tex/pre

-- 
1.7.3.4.789.g74ad1

Thomas Rast· Dec 18, 2010, 16:17 UTC · re: Thomas Rast · lore

[PATCH v2 1/4] diff.c: pass struct diff_words into find_word_boundaries

We need the word_regex_check member. Instead of adding another argument, just pass in the whole struct for future extensibility.

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
---
 diff.c |   11 ++++++-----
 1 files changed, 6 insertions(+), 5 deletions(-)

Show changes to diff.c +6 −5

diff --git a/diff.c b/diff.c
index 0a43869..5fdcb15 100644
--- a/diff.c
+++ b/diff.c
@@ -778,12 +778,13 @@ static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
 }
 
 /* This function starts looking at *begin, and returns 0 iff a word was found. */
-static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
+static int find_word_boundaries(mmfile_t *buffer, struct diff_words_data *diff_words,
 		int *begin, int *end)
 {
-	if (word_regex && *begin < buffer->size) {
+	if (diff_words->word_regex && *begin < buffer->size) {
 		regmatch_t match[1];
-		if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
+		if (!regexec(diff_words->word_regex, buffer->ptr + *begin,
+			     1, match, 0)) {
 			char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
 					'\n', match[0].rm_eo - match[0].rm_so);
 			*end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
@@ -813,7 +814,7 @@ static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
  * in buffer->orig.
  */
 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
-		regex_t *word_regex)
+		struct diff_words_data *diff_words)
 {
 	int i, j;
 	long alloc = 0;
@@ -827,7 +828,7 @@ static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
 	buffer->orig_nr = 1;
 
 	for (i = 0; i < buffer->text.size; i++) {
-		if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
+		if (find_word_boundaries(&buffer->text, diff_words, &i, &j))
 			return;
 
 		/* store original boundaries */

-- 
1.7.3.4.789.g74ad1

Thomas Rast· Dec 18, 2010, 16:17 UTC · re: Thomas Rast · lore

[PATCH v2 2/4] diff.c: implement a sanity check for word regexes

Implement a safeguard that verifies two basic sanity assumptions:

* The word regex matches anything that is !isspace().

* The word regex does not match '\n'.  (This case is not very harmful,
  but we used to silently cut off at the '\n' which may go against
  user expectations.)

This is configurable via 'diff.wordRegexCheck', and defaults to 'warn'.

Reported-by: Scott Johnson <scottj75074@yahoo.com>
Signed-off-by: Thomas Rast <trast@student.ethz.ch>
---
 Documentation/config.txt |    8 ++++
 diff.c                   |   93 +++++++++++++++++++++++++++++++++++++++++++--
 diff.h                   |    1 +
 t/t4034-diff-words.sh    |   65 +++++++++++++++++++++++++++++++-
 4 files changed, 161 insertions(+), 6 deletions(-)

Show changes to 4 files +161 −6

Documentation/config.txt, diff.c, diff.h, t/t4034-diff-words.sh

diff --git a/Documentation/config.txt b/Documentation/config.txt
index bf9479e..2e033ea 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -897,6 +897,14 @@ diff.wordRegex::
 	sequences that match the regular expression are "words", all other
 	characters are *ignorable* whitespace.
 
+diff.wordRegexCheck::
+	Perform a simple sanity check on matches of the word regex.
+	Currently this check ensures that the word regex matches all
+	non-space characters, and that the word regex does not match a
+	newline.  The setting controls what to do when the check
+	fails: 'false'/'off'/'ignore' ignore, 'true'/'on'/'warn' emit
+	a warning, and 'error' abort with an error message.
+
 fetch.recurseSubmodules::
 	A boolean value which changes the behavior for fetch and pull, the
 	default is to not recursively fetch populated sumodules unless
diff --git a/diff.c b/diff.c
index 5fdcb15..7213b2b 100644
--- a/diff.c
+++ b/diff.c
@@ -22,11 +22,17 @@
 #define FAST_WORKING_DIRECTORY 1
 #endif
 
+#define REGEX_CHECK_UNSET -1
+#define REGEX_CHECK_OFF 0
+#define REGEX_CHECK_WARN 1
+#define REGEX_CHECK_ERROR 2
+
 static int diff_detect_rename_default;
 static int diff_rename_limit_default = 200;
 static int diff_suppress_blank_empty;
 int diff_use_color_default = -1;
 static const char *diff_word_regex_cfg;
+static int diff_word_regex_check_cfg = REGEX_CHECK_UNSET;
 static const char *external_diff_cmd_cfg;
 int diff_auto_refresh_index = 1;
 static int diff_mnemonic_prefix;
@@ -75,6 +81,19 @@ static int git_config_rename(const char *var, const char *value)
 	return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
 }
 
+static int parse_regex_check_level(int *b, const char *k, const char *v)
+{
+	if (v && !strcasecmp(v, "ignore"))
+		*b = REGEX_CHECK_OFF;
+	else if (v && !strcasecmp(v, "warn"))
+		*b = REGEX_CHECK_WARN;
+	else if (v && !strcasecmp(v, "error"))
+		*b = REGEX_CHECK_ERROR;
+	else
+		*b = git_config_bool(k, v);
+	return 1;
+}
+
 /*
  * These are to give UI layer defaults.
  * The core-level commands such as git-diff-files should
@@ -107,6 +126,8 @@ int git_diff_ui_config(const char *var, const char *value, void *cb)
 		return git_config_string(&external_diff_cmd_cfg, var, value);
 	if (!strcmp(var, "diff.wordregex"))
 		return git_config_string(&diff_word_regex_cfg, var, value);
+	if (!strcmp(var, "diff.wordregexcheck"))
+		return parse_regex_check_level(&diff_word_regex_check_cfg, var, value);
 
 	if (!strcmp(var, "diff.ignoresubmodules"))
 		handle_ignore_submodules_arg(&default_diff_options, value);
@@ -777,6 +798,50 @@ static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
 	diff_words->last_minus = minus_first;
 }
 
+
+static void check_word_regex_match(struct diff_words_data *diff_words,
+		char *start, int len, int unmatched)
+{
+	int check = diff_words->opt->word_regex_check;
+	void (*report_fn)(const char *, ...);
+
+	if (check == REGEX_CHECK_OFF)
+		return;
+
+	if (check == REGEX_CHECK_WARN)
+		report_fn = warning;
+	else if (check == REGEX_CHECK_ERROR)
+		report_fn = die;
+	else
+		assert(!"expected REGEX_CHECK_WARN or _ERROR");
+
+	if (unmatched) {
+		int i;
+		char *match_str;
+		for (i = 0; i < len; i++) {
+			if (isspace(start[i]))
+				continue;
+			match_str = xmemdupz(start, len);
+			report_fn("The following snippet contains non-space "
+				  "characters, but was not\nmatched by the "
+				  "word regex:\n'%s'\n"
+				  "They would be ignored for the purposes of "
+				  "the diff, which is\nusually not what you want.",
+				  match_str);
+			free(match_str);
+			break;
+		}
+	} else {
+		if (memchr(start, '\n', len)) {
+			char *match_str = xmemdupz(start, len);
+			report_fn("The following word regex match contains a newline "
+				  "and will be truncated there:\n'%s'",
+				  match_str);
+			free(match_str);
+		}
+	}
+}
+
 /* This function starts looking at *begin, and returns 0 iff a word was found. */
 static int find_word_boundaries(mmfile_t *buffer, struct diff_words_data *diff_words,
 		int *begin, int *end)
@@ -785,8 +850,15 @@ static int find_word_boundaries(mmfile_t *buffer, struct diff_words_data *diff_w
 		regmatch_t match[1];
 		if (!regexec(diff_words->word_regex, buffer->ptr + *begin,
 			     1, match, 0)) {
-			char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
-					'\n', match[0].rm_eo - match[0].rm_so);
+			char *prev_start = buffer->ptr + *begin;
+			char *match_start = prev_start + match[0].rm_so;
+			int match_len = match[0].rm_eo - match[0].rm_so;
+			char *p;
+			check_word_regex_match(diff_words, prev_start,
+					       match_start-prev_start, 1);
+			check_word_regex_match(diff_words, match_start,
+					       match_len, 0);
+			p = memchr(match_start, '\n', match_len);
 			*end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
 			*begin += match[0].rm_so;
 			return *begin >= *end;
@@ -829,7 +901,7 @@ static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
 
 	for (i = 0; i < buffer->text.size; i++) {
 		if (find_word_boundaries(&buffer->text, diff_words, &i, &j))
-			return;
+			break;
 
 		/* store original boundaries */
 		ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
@@ -846,6 +918,11 @@ static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
 
 		i = j - 1;
 	}
+
+	/* no more boundaries, check any non-matched chunk remaining */
+	if (i < buffer->text.size)
+		check_word_regex_match(diff_words, buffer->text.ptr + i,
+				       buffer->text.size-i, 1);
 }
 
 /* this executes the word diff on the accumulated buffers */
@@ -882,8 +959,8 @@ static void diff_words_show(struct diff_words_data *diff_words)
 
 	memset(&xpp, 0, sizeof(xpp));
 	memset(&xecfg, 0, sizeof(xecfg));
-	diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
-	diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
+	diff_words_fill(&diff_words->minus, &minus, diff_words);
+	diff_words_fill(&diff_words->plus, &plus, diff_words);
 	xpp.flags = 0;
 	/* as only the hunk header will be parsed, we need a 0-context */
 	xecfg.ctxlen = 0;
@@ -2021,6 +2098,10 @@ static void builtin_diff(const char *name_a,
 				o->word_regex = userdiff_word_regex(two);
 			if (!o->word_regex)
 				o->word_regex = diff_word_regex_cfg;
+			if (o->word_regex_check == REGEX_CHECK_UNSET)
+				o->word_regex_check = diff_word_regex_check_cfg;
+			if (o->word_regex_check == REGEX_CHECK_UNSET)
+				o->word_regex_check = REGEX_CHECK_WARN;
 			if (o->word_regex) {
 				ecbdata.diff_words->word_regex = (regex_t *)
 					xmalloc(sizeof(regex_t));
@@ -2861,6 +2942,8 @@ void diff_setup(struct diff_options *options)
 		options->a_prefix = "a/";
 		options->b_prefix = "b/";
 	}
+
+	options->word_regex_check = REGEX_CHECK_UNSET;
 }
 
 int diff_setup_done(struct diff_options *options)
diff --git a/diff.h b/diff.h
index 0083d92..4d02981 100644
--- a/diff.h
+++ b/diff.h
@@ -122,6 +122,7 @@ struct diff_options {
 	int stat_width;
 	int stat_name_width;
 	const char *word_regex;
+	int word_regex_check;
 	enum diff_words_type word_diff;
 
 	/* this is set by diffcore for DIFF_FORMAT_PATCH */
diff --git a/t/t4034-diff-words.sh b/t/t4034-diff-words.sh
index 8096d8a..ebe72ce 100755
--- a/t/t4034-diff-words.sh
+++ b/t/t4034-diff-words.sh
@@ -8,7 +8,8 @@ test_expect_success setup '
 
 	git config diff.color.old red &&
 	git config diff.color.new green &&
-	git config diff.color.func magenta
+	git config diff.color.func magenta &&
+	git config diff.wordRegexCheck off
 
 '
 
@@ -331,4 +332,66 @@ test_expect_success '--word-diff=none' '
 
 '
 
+echo abcd > pre
+echo aXYd > post
+
+test_expect_success 'diff.wordRegexCheck="error" catches nonspaces' '
+
+	git config diff.wordRegexCheck error &&
+	test_must_fail git diff --no-index --word-diff-regex="a|d" pre post 2>out &&
+	grep "fatal.*contains non-space characters" out
+
+'
+
+newline="
+"
+
+test_expect_success 'diff.wordRegexCheck="error" catches newlines' '
+
+	git config diff.wordRegexCheck error &&
+	test_must_fail git diff --no-index --word-diff-regex=".|$newline" pre post 2>out &&
+	grep "fatal.*contains a newline" out
+
+'
+
+test_expect_success 'diff.wordRegexCheck="warn" works' '
+
+	git config diff.wordRegexCheck warn &&
+	test_must_fail git diff --no-index --word-diff-regex="a|d" pre post 2>out &&
+	grep "warning.*contains non-space characters" out
+
+'
+
+test_expect_success 'diff.wordRegexCheck="ignore" works' '
+
+	git config diff.wordRegexCheck ignore &&
+	test_must_fail git diff --no-index --word-diff-regex="a|d" pre post 2>out &&
+	! grep "contains non-space characters" out
+
+'
+
+test_expect_success 'diff.wordRegexCheck="false" is like "ignore"' '
+
+	git config diff.wordRegexCheck false &&
+	test_must_fail git diff --no-index --word-diff-regex="a|d" pre post 2>out &&
+	! grep "contains non-space characters" out
+
+'
+
+test_expect_success 'diff.wordRegexCheck="true" is like "warn"' '
+
+	git config diff.wordRegexCheck true &&
+	test_must_fail git diff --no-index --word-diff-regex="a|d" pre post 2>out &&
+	grep "warning.*contains non-space characters" out
+
+'
+
+test_expect_success 'diff.wordRegexCheck unset is like "warn"' '
+
+	git config --unset diff.wordRegexCheck &&
+	test_must_fail git diff --no-index --word-diff-regex="a|d" pre post 2>out &&
+	grep "warning.*contains non-space characters" out
+
+'
+
 test_done

-- 
1.7.3.4.789.g74ad1

Junio C Hamano· Dec 18, 2010, 21:00 UTC · re: Thomas Rast · lore

Re: [PATCH v2 2/4] diff.c: implement a sanity check for word regexes

Thomas Rast <trast@student.ethz.ch> writes:

Show 15 quoted lines

> Word regexes are a bit of a dangerous beast, since it is easily
> possible to not match a non-space part, which is subsequently ignored
> for the purposes of emitting the word diff.  This was clearly stated
> in the docs, but users still tripped over it.
>
> Implement a safeguard that verifies two basic sanity assumptions:
>
> * The word regex matches anything that is !isspace().
>
> * The word regex does not match '\n'.  (This case is not very harmful,
>   but we used to silently cut off at the '\n' which may go against
>   user expectations.)
>
> This is configurable via 'diff.wordRegexCheck', and defaults to
> 'warn'.

How expensive to run this check twice, every time word_regex finds a match?

As this is about making sure that we got a sane regex from the user (or a builtin pattern), I wonder if we can make it not depend on the payload we are matching the regex against. Then before using a word_regex that we have not checked, we check if that regex is sane, mark it checked, and do not have to do the check over and over again.

Thomas Rast· Dec 19, 2010, 01:59 UTC · re: Junio C Hamano · lore

Re: [PATCH v2 2/4] diff.c: implement a sanity check for word regexes

Junio C Hamano wrote:

Show 10 quoted lines

> Thomas Rast <trast@student.ethz.ch> writes:
> 
> > * The word regex matches anything that is !isspace().
> >
> > * The word regex does not match '\n'.  (This case is not very harmful,
> >   but we used to silently cut off at the '\n' which may go against
> >   user expectations.)
> 
> How expensive to run this check twice, every time word_regex finds a
> match?

It runs the first bullet point for every non-match, and the second bullet point for every match. So it looks at every input character exactly once.

Show 5 quoted lines

> As this is about making sure that we got a sane regex from the user (or a
> builtin pattern), I wonder if we can make it not depend on the payload we
> are matching the regex against.  Then before using a word_regex that we
> have not checked, we check if that regex is sane, mark it checked, and do
> not have to do the check over and over again.

Algorithmically it should be easy once you have the finite state automaton corresponding to the regex: just verify that for every possible non-terminal state, there is a transition for every !isspace() character to a state other than "fail to match" or "match the empty string".

In the implementation, it might be doable if we switch to compat/regex on all platforms, since we then have ready access to all internal structures regcomp() creates, including the DFA.

I'll think about at least using compat/regex for a static check of all *builtin* patterns, which would be superior to the brute force approach in 4/4.

-- 
Thomas Rast
trast@{inf,student}.ethz.ch

Thomas Rast· Dec 18, 2010, 16:17 UTC · re: Thomas Rast · lore

[PATCH v2 3/4] userdiff: fix typo in ruby and python word regexes

Both had an unclosed ] that ruined the safeguard against not matching a non-space char.

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
---
 userdiff.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

Show changes to userdiff.c +2 −2

diff --git a/userdiff.c b/userdiff.c
index f9e05b5..2d54536 100644
--- a/userdiff.c
+++ b/userdiff.c
@@ -74,14 +74,14 @@
 	 "[a-zA-Z_][a-zA-Z0-9_]*"
 	 "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
 	 "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"
-	 "|[^[:space:]|[\x80-\xff]+"),
+	 "|[^[:space:]]|[\x80-\xff]+"),
 	 /* -- */
 PATTERNS("ruby", "^[ \t]*((class|module|def)[ \t].*)$",
 	 /* -- */
 	 "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
 	 "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
 	 "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"
-	 "|[^[:space:]|[\x80-\xff]+"),
+	 "|[^[:space:]]|[\x80-\xff]+"),
 PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
 	 "[={}\"]|[^={}\" \t]+"),
 PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",

-- 
1.7.3.4.789.g74ad1

Junio C Hamano· Dec 18, 2010, 21:02 UTC · re: Thomas Rast · lore

Re: [PATCH v2 3/4] userdiff: fix typo in ruby and python word regexes

Thomas Rast <trast@student.ethz.ch> writes:

> Both had an unclosed ] that ruined the safeguard against not matching
> a non-space char.

Thanks.

Couldn't we have found this without your "sanity check" patch? Are we ignoring error returns from regcomp() in some codepath, or is it just that we are catching them but our test suite lacks ruby and python test vectors?

Thomas Rast· Dec 19, 2010, 02:10 UTC · re: Junio C Hamano · lore

Re: [PATCH v2 3/4] userdiff: fix typo in ruby and python word regexes

Junio C Hamano wrote:

Show 11 quoted lines

> Thomas Rast <trast@student.ethz.ch> writes:
> 
> > Both had an unclosed ] that ruined the safeguard against not matching
> > a non-space char.
> 
> Thanks.
> 
> Couldn't we have found this without your "sanity check" patch?  Are we
> ignoring error returns from regcomp() in some codepath, or is it just that
> we are catching them but our test suite lacks ruby and python test
> vectors?

We lacked test vectors, but we still couldn't have caught it. We do check for errors in regcomp():

	if (o->word_regex) {
		ecbdata.diff_words->word_regex = (regex_t *)
			xmalloc(sizeof(regex_t));
		if (regcomp(ecbdata.diff_words->word_regex,
				o->word_regex,
				REG_EXTENDED | REG_NEWLINE))
			die ("Invalid regular expression: %s",
					o->word_regex);
	}

(Now that I'm seeing this and comparing with regcomp(3), we should actually report regerror() as part of the error message.)

The problem is that the pattern is still valid. Consider that it was a final two arms to the regex:

-        "|[^[:space:]|[\x80-\xff]+"),
+        "|[^[:space:]]|[\x80-\xff]+"),

In the preimage, it parses like so:

  | [^
      [:space:]|[\x80-\xff
     ]+

That is, the third [ is part of the (negated) character class. So the only problem is with | or [ characters in the input. Any other non-space character is part of the class.

-- 
Thomas Rast
trast@{inf,student}.ethz.ch

Thomas Rast· Dec 18, 2010, 16:17 UTC · re: Thomas Rast · lore

[PATCH v2 4/4] t4034: bulk verify builtin word regex sanity

The builtin word regexes should be tested with some simple examples against simple issues, like failing to match a non-space character. Do this in bulk.

Mainly due to a lack of language knowledge and inspiration, most of the test cases (cpp, csharp, java, objc, pascal, php, python, ruby) are directly based off a C operator precedence table to verify that all operators are split correctly. This means that they are probably incomplete or inaccurate except for 'cpp' itself.

Still, they are good enough to already have uncovered a typo in the python and ruby patterns.

'fortran' is based on my anecdotal knowledge of the DO10I parsing rules, and thus probably useless. The rest (bibtex, html, tex) are an ad-hoc test of what I consider important splits in those languages.

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
---
 t/t4034-diff-words.sh  |   20 ++++++++++++++++++++
 t/t4034/bibtex/expect  |   15 +++++++++++++++
 t/t4034/bibtex/post    |   10 ++++++++++
 t/t4034/bibtex/pre     |    9 +++++++++
 t/t4034/cpp/expect     |   36 ++++++++++++++++++++++++++++++++++++
 t/t4034/cpp/post       |   19 +++++++++++++++++++
 t/t4034/cpp/pre        |   19 +++++++++++++++++++
 t/t4034/csharp/expect  |   35 +++++++++++++++++++++++++++++++++++
 t/t4034/csharp/post    |   18 ++++++++++++++++++
 t/t4034/csharp/pre     |   18 ++++++++++++++++++
 t/t4034/fortran/expect |   10 ++++++++++
 t/t4034/fortran/post   |    5 +++++
 t/t4034/fortran/pre    |    5 +++++
 t/t4034/html/expect    |    8 ++++++++
 t/t4034/html/post      |    3 +++
 t/t4034/html/pre       |    3 +++
 t/t4034/java/expect    |   36 ++++++++++++++++++++++++++++++++++++
 t/t4034/java/post      |   19 +++++++++++++++++++
 t/t4034/java/pre       |   19 +++++++++++++++++++
 t/t4034/objc/expect    |   35 +++++++++++++++++++++++++++++++++++
 t/t4034/objc/post      |   18 ++++++++++++++++++
 t/t4034/objc/pre       |   18 ++++++++++++++++++
 t/t4034/pascal/expect  |   35 +++++++++++++++++++++++++++++++++++
 t/t4034/pascal/post    |   18 ++++++++++++++++++
 t/t4034/pascal/pre     |   18 ++++++++++++++++++
 t/t4034/php/expect     |   35 +++++++++++++++++++++++++++++++++++
 t/t4034/php/post       |   18 ++++++++++++++++++
 t/t4034/php/pre        |   18 ++++++++++++++++++
 t/t4034/python/expect  |   34 ++++++++++++++++++++++++++++++++++
 t/t4034/python/post    |   17 +++++++++++++++++
 t/t4034/python/pre     |   17 +++++++++++++++++
 t/t4034/ruby/expect    |   34 ++++++++++++++++++++++++++++++++++
 t/t4034/ruby/post      |   17 +++++++++++++++++
 t/t4034/ruby/pre       |   17 +++++++++++++++++
 t/t4034/tex/expect     |    9 +++++++++
 t/t4034/tex/post       |    4 ++++
 t/t4034/tex/pre        |    4 ++++
 37 files changed, 673 insertions(+), 0 deletions(-)
 create mode 100644 t/t4034/bibtex/expect
 create mode 100644 t/t4034/bibtex/post
 create mode 100644 t/t4034/bibtex/pre
 create mode 100644 t/t4034/cpp/expect
 create mode 100644 t/t4034/cpp/post
 create mode 100644 t/t4034/cpp/pre
 create mode 100644 t/t4034/csharp/expect
 create mode 100644 t/t4034/csharp/post
 create mode 100644 t/t4034/csharp/pre
 create mode 100644 t/t4034/fortran/expect
 create mode 100644 t/t4034/fortran/post
 create mode 100644 t/t4034/fortran/pre
 create mode 100644 t/t4034/html/expect
 create mode 100644 t/t4034/html/post
 create mode 100644 t/t4034/html/pre
 create mode 100644 t/t4034/java/expect
 create mode 100644 t/t4034/java/post
 create mode 100644 t/t4034/java/pre
 create mode 100644 t/t4034/objc/expect
 create mode 100644 t/t4034/objc/post
 create mode 100644 t/t4034/objc/pre
 create mode 100644 t/t4034/pascal/expect
 create mode 100644 t/t4034/pascal/post
 create mode 100644 t/t4034/pascal/pre
 create mode 100644 t/t4034/php/expect
 create mode 100644 t/t4034/php/post
 create mode 100644 t/t4034/php/pre
 create mode 100644 t/t4034/python/expect
 create mode 100644 t/t4034/python/post
 create mode 100644 t/t4034/python/pre
 create mode 100644 t/t4034/ruby/expect
 create mode 100644 t/t4034/ruby/post
 create mode 100644 t/t4034/ruby/pre
 create mode 100644 t/t4034/tex/expect
 create mode 100644 t/t4034/tex/post
 create mode 100644 t/t4034/tex/pre

Show changes to 37 files +673 −0

diff --git a/t/t4034-diff-words.sh b/t/t4034-diff-words.sh
index ebe72ce..c537116 100755
--- a/t/t4034-diff-words.sh
+++ b/t/t4034-diff-words.sh
@@ -394,4 +394,24 @@ test_expect_success 'diff.wordRegexCheck unset is like "warn"' '
 
 '
 
+test_expect_success 'set diff.wordRegexCheck=error for language tests' '
+
+	git config diff.wordRegexCheck error
+
+'
+
+word_diff_for_language () {
+	cp $TEST_DIRECTORY/t4034/$1/pre $TEST_DIRECTORY/t4034/$1/post \
+		$TEST_DIRECTORY/t4034/$1/expect . &&
+	echo "* diff=$1" > .gitattributes &&
+	word_diff --color-words && cp output output.$1
+}
+
+for lang_dir in $TEST_DIRECTORY/t4034/*; do
+	lang=${lang_dir#$TEST_DIRECTORY/t4034/}
+	test_expect_success "diff driver '$lang' has sane word regex" "
+		word_diff_for_language $lang
+	"
+done
+
 test_done
diff --git a/t/t4034/bibtex/expect b/t/t4034/bibtex/expect
new file mode 100644
index 0000000..a157774
--- /dev/null
+++ b/t/t4034/bibtex/expect
@@ -0,0 +1,15 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 95cd55b..ddcba9b 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,9 +1,10 @@<RESET>
+@article{aldous1987uie,<RESET>
+  title={{Ultimate instability of exponential back-off protocol for acknowledgment-based transmission control of random access communication channels}},<RESET>
+  author={Aldous, <RED>D.<RESET><GREEN>David<RESET>},
+  journal={Information Theory, IEEE Transactions on},<RESET>
+  volume={<RED>33<RESET><GREEN>Bogus.<RESET>},
+  number={<RED>2<RESET><GREEN>4<RESET>},
+  pages={219--223},<RESET>
+  year=<GREEN>1987,<RESET>
+<GREEN>  note={This is in fact a rather funny read since ethernet works well in practice. The<RESET> {<RED>1987<RESET><GREEN>\em pre} reference is the right one, however.<RESET>}<RED>,<RESET>
+}<RESET>
diff --git a/t/t4034/bibtex/post b/t/t4034/bibtex/post
new file mode 100644
index 0000000..ddcba9b
--- /dev/null
+++ b/t/t4034/bibtex/post
@@ -0,0 +1,10 @@
+@article{aldous1987uie,
+  title={{Ultimate instability of exponential back-off protocol for acknowledgment-based transmission control of random access communication channels}},
+  author={Aldous, David},
+  journal={Information Theory, IEEE Transactions on},
+  volume={Bogus.},
+  number={4},
+  pages={219--223},
+  year=1987,
+  note={This is in fact a rather funny read since ethernet works well in practice. The {\em pre} reference is the right one, however.}
+}
diff --git a/t/t4034/bibtex/pre b/t/t4034/bibtex/pre
new file mode 100644
index 0000000..95cd55b
--- /dev/null
+++ b/t/t4034/bibtex/pre
@@ -0,0 +1,9 @@
+@article{aldous1987uie,
+  title={{Ultimate instability of exponential back-off protocol for acknowledgment-based transmission control of random access communication channels}},
+  author={Aldous, D.},
+  journal={Information Theory, IEEE Transactions on},
+  volume={33},
+  number={2},
+  pages={219--223},
+  year={1987},
+}
diff --git a/t/t4034/cpp/expect b/t/t4034/cpp/expect
new file mode 100644
index 0000000..37d1ea2
--- /dev/null
+++ b/t/t4034/cpp/expect
@@ -0,0 +1,36 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 23d5c8a..7e8c026 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,19 +1,19 @@<RESET>
+Foo() : x(0<RED>&&1<RESET><GREEN>&42<RESET>) { <GREEN>bar(x);<RESET> }
+cout<<"Hello World<RED>!<RESET><GREEN>?<RESET>\n"<<endl;
+<GREEN>(<RESET>1<GREEN>) (<RESET>-1e10<GREEN>) (<RESET>0xabcdef<GREEN>)<RESET> '<RED>x<RESET><GREEN>y<RESET>'
+[<RED>a<RESET><GREEN>x<RESET>] <RED>a<RESET><GREEN>x<RESET>-><RED>b a<RESET><GREEN>y x<RESET>.<RED>b<RESET><GREEN>y<RESET>
+!<RED>a<RESET><GREEN>x<RESET> ~<RED>a a<RESET><GREEN>x x<RESET>++ <RED>a<RESET><GREEN>x<RESET>-- <RED>a<RESET><GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>/<RED>b a<RESET><GREEN>y x<RESET>%<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>+<RED>b a<RESET><GREEN>y x<RESET>-<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<<RED>b a<RESET><GREEN>y x<RESET>>><RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<RED>b a<RESET><GREEN>y x<RESET><=<RED>b a<RESET><GREEN>y x<RESET>><RED>b a<RESET><GREEN>y x<RESET>>=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>==<RED>b a<RESET><GREEN>y x<RESET>!=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>^<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>|<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>||<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>?<RED>b<RESET><GREEN>y<RESET>:z
+<RED>a<RESET><GREEN>x<RESET>=<RED>b a<RESET><GREEN>y x<RESET>+=<RED>b a<RESET><GREEN>y x<RESET>-=<RED>b a<RESET><GREEN>y x<RESET>*=<RED>b a<RESET><GREEN>y x<RESET>/=<RED>b a<RESET><GREEN>y x<RESET>%=<RED>b a<RESET><GREEN>y x<RESET><<=<RED>b a<RESET><GREEN>y x<RESET>>>=<RED>b a<RESET><GREEN>y x<RESET>&=<RED>b a<RESET><GREEN>y x<RESET>^=<RED>b a<RESET><GREEN>y x<RESET>|=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>,y
+<RED>a<RESET><GREEN>x<RESET>::<RED>b<RESET><GREEN>y<RESET>
diff --git a/t/t4034/cpp/post b/t/t4034/cpp/post
new file mode 100644
index 0000000..7e8c026
--- /dev/null
+++ b/t/t4034/cpp/post
@@ -0,0 +1,19 @@
+Foo() : x(0&42) { bar(x); }
+cout<<"Hello World?\n"<<endl;
+(1) (-1e10) (0xabcdef) 'y'
+[x] x->y x.y
+!x ~x x++ x-- x*y x&y
+x*y x/y x%y
+x+y x-y
+x<<y x>>y
+x<y x<=y x>y x>=y
+x==y x!=y
+x&y
+x^y
+x|y
+x&&y
+x||y
+x?y:z
+x=y x+=y x-=y x*=y x/=y x%=y x<<=y x>>=y x&=y x^=y x|=y
+x,y
+x::y
diff --git a/t/t4034/cpp/pre b/t/t4034/cpp/pre
new file mode 100644
index 0000000..23d5c8a
--- /dev/null
+++ b/t/t4034/cpp/pre
@@ -0,0 +1,19 @@
+Foo():x(0&&1){}
+cout<<"Hello World!\n"<<endl;
+1 -1e10 0xabcdef 'x'
+[a] a->b a.b
+!a ~a a++ a-- a*b a&b
+a*b a/b a%b
+a+b a-b
+a<<b a>>b
+a<b a<=b a>b a>=b
+a==b a!=b
+a&b
+a^b
+a|b
+a&&b
+a||b
+a?b:z
+a=b a+=b a-=b a*=b a/=b a%=b a<<=b a>>=b a&=b a^=b a|=b
+a,y
+a::b
diff --git a/t/t4034/csharp/expect b/t/t4034/csharp/expect
new file mode 100644
index 0000000..e5d1dd2
--- /dev/null
+++ b/t/t4034/csharp/expect
@@ -0,0 +1,35 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 9106d63..dd5f421 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,18 +1,18 @@<RESET>
+Foo() : x(0<RED>&&1<RESET><GREEN>&42<RESET>) { <GREEN>bar(x);<RESET> }
+cout<<"Hello World<RED>!<RESET><GREEN>?<RESET>\n"<<endl;
+<GREEN>(<RESET>1<GREEN>) (<RESET>-1e10<GREEN>) (<RESET>0xabcdef<GREEN>)<RESET> '<RED>x<RESET><GREEN>y<RESET>'
+[<RED>a<RESET><GREEN>x<RESET>] <RED>a<RESET><GREEN>x<RESET>-><RED>b a<RESET><GREEN>y x<RESET>.<RED>b<RESET><GREEN>y<RESET>
+!<RED>a<RESET><GREEN>x<RESET> ~<RED>a a<RESET><GREEN>x x<RESET>++ <RED>a<RESET><GREEN>x<RESET>-- <RED>a<RESET><GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>/<RED>b a<RESET><GREEN>y x<RESET>%<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>+<RED>b a<RESET><GREEN>y x<RESET>-<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<<RED>b a<RESET><GREEN>y x<RESET>>><RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<RED>b a<RESET><GREEN>y x<RESET><=<RED>b a<RESET><GREEN>y x<RESET>><RED>b a<RESET><GREEN>y x<RESET>>=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>==<RED>b a<RESET><GREEN>y x<RESET>!=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>^<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>|<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>||<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>?<RED>b<RESET><GREEN>y<RESET>:z
+<RED>a<RESET><GREEN>x<RESET>=<RED>b a<RESET><GREEN>y x<RESET>+=<RED>b a<RESET><GREEN>y x<RESET>-=<RED>b a<RESET><GREEN>y x<RESET>*=<RED>b a<RESET><GREEN>y x<RESET>/=<RED>b a<RESET><GREEN>y x<RESET>%=<RED>b a<RESET><GREEN>y x<RESET><<=<RED>b a<RESET><GREEN>y x<RESET>>>=<RED>b a<RESET><GREEN>y x<RESET>&=<RED>b a<RESET><GREEN>y x<RESET>^=<RED>b a<RESET><GREEN>y x<RESET>|=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>,y
diff --git a/t/t4034/csharp/post b/t/t4034/csharp/post
new file mode 100644
index 0000000..dd5f421
--- /dev/null
+++ b/t/t4034/csharp/post
@@ -0,0 +1,18 @@
+Foo() : x(0&42) { bar(x); }
+cout<<"Hello World?\n"<<endl;
+(1) (-1e10) (0xabcdef) 'y'
+[x] x->y x.y
+!x ~x x++ x-- x*y x&y
+x*y x/y x%y
+x+y x-y
+x<<y x>>y
+x<y x<=y x>y x>=y
+x==y x!=y
+x&y
+x^y
+x|y
+x&&y
+x||y
+x?y:z
+x=y x+=y x-=y x*=y x/=y x%=y x<<=y x>>=y x&=y x^=y x|=y
+x,y
diff --git a/t/t4034/csharp/pre b/t/t4034/csharp/pre
new file mode 100644
index 0000000..9106d63
--- /dev/null
+++ b/t/t4034/csharp/pre
@@ -0,0 +1,18 @@
+Foo():x(0&&1){}
+cout<<"Hello World!\n"<<endl;
+1 -1e10 0xabcdef 'x'
+[a] a->b a.b
+!a ~a a++ a-- a*b a&b
+a*b a/b a%b
+a+b a-b
+a<<b a>>b
+a<b a<=b a>b a>=b
+a==b a!=b
+a&b
+a^b
+a|b
+a&&b
+a||b
+a?b:z
+a=b a+=b a-=b a*=b a/=b a%=b a<<=b a>>=b a&=b a^=b a|=b
+a,y
diff --git a/t/t4034/fortran/expect b/t/t4034/fortran/expect
new file mode 100644
index 0000000..b233dbd
--- /dev/null
+++ b/t/t4034/fortran/expect
@@ -0,0 +1,10 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 87f0d0b..d308da2 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,5 +1,5 @@<RESET>
+print *, "Hello World<RED>!<RESET><GREEN>?<RESET>"
+
+DO10I = 1,10<RESET>
+<RED>DO10I<RESET><GREEN>DO 10 I<RESET> = 1,10
+<RED>DO10I<RESET><GREEN>DO 1 0 I<RESET> = 1,10
diff --git a/t/t4034/fortran/post b/t/t4034/fortran/post
new file mode 100644
index 0000000..d308da2
--- /dev/null
+++ b/t/t4034/fortran/post
@@ -0,0 +1,5 @@
+print *, "Hello World?"
+
+DO10I = 1,10
+DO 10 I = 1,10
+DO 1 0 I = 1,10
diff --git a/t/t4034/fortran/pre b/t/t4034/fortran/pre
new file mode 100644
index 0000000..87f0d0b
--- /dev/null
+++ b/t/t4034/fortran/pre
@@ -0,0 +1,5 @@
+print *, "Hello World!"
+
+DO10I = 1,10
+DO10I = 1,10
+DO10I = 1,10
diff --git a/t/t4034/html/expect b/t/t4034/html/expect
new file mode 100644
index 0000000..447b49a
--- /dev/null
+++ b/t/t4034/html/expect
@@ -0,0 +1,8 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 8ca4aea..46921e5 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,3 +1,3 @@<RESET>
+<tag <GREEN>newattr="newvalue"<RESET>><GREEN>added<RESET> content</tag>
+<tag attr=<RED>"value"<RESET><GREEN>"newvalue"<RESET>><RED>content<RESET><GREEN>changed<RESET></tag>
+<<RED>tag<RESET><GREEN>newtag<RESET>>content <RED>&entity;<RESET><GREEN>&newentity;<RESET><<RED>/tag<RESET><GREEN>/newtag<RESET>>
diff --git a/t/t4034/html/post b/t/t4034/html/post
new file mode 100644
index 0000000..46921e5
--- /dev/null
+++ b/t/t4034/html/post
@@ -0,0 +1,3 @@
+<tag newattr="newvalue">added content</tag>
+<tag attr="newvalue">changed</tag>
+<newtag>content &newentity;</newtag>
diff --git a/t/t4034/html/pre b/t/t4034/html/pre
new file mode 100644
index 0000000..8ca4aea
--- /dev/null
+++ b/t/t4034/html/pre
@@ -0,0 +1,3 @@
+<tag>content</tag>
+<tag attr="value">content</tag>
+<tag>content &entity;</tag>
diff --git a/t/t4034/java/expect b/t/t4034/java/expect
new file mode 100644
index 0000000..37d1ea2
--- /dev/null
+++ b/t/t4034/java/expect
@@ -0,0 +1,36 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 23d5c8a..7e8c026 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,19 +1,19 @@<RESET>
+Foo() : x(0<RED>&&1<RESET><GREEN>&42<RESET>) { <GREEN>bar(x);<RESET> }
+cout<<"Hello World<RED>!<RESET><GREEN>?<RESET>\n"<<endl;
+<GREEN>(<RESET>1<GREEN>) (<RESET>-1e10<GREEN>) (<RESET>0xabcdef<GREEN>)<RESET> '<RED>x<RESET><GREEN>y<RESET>'
+[<RED>a<RESET><GREEN>x<RESET>] <RED>a<RESET><GREEN>x<RESET>-><RED>b a<RESET><GREEN>y x<RESET>.<RED>b<RESET><GREEN>y<RESET>
+!<RED>a<RESET><GREEN>x<RESET> ~<RED>a a<RESET><GREEN>x x<RESET>++ <RED>a<RESET><GREEN>x<RESET>-- <RED>a<RESET><GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>/<RED>b a<RESET><GREEN>y x<RESET>%<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>+<RED>b a<RESET><GREEN>y x<RESET>-<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<<RED>b a<RESET><GREEN>y x<RESET>>><RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<RED>b a<RESET><GREEN>y x<RESET><=<RED>b a<RESET><GREEN>y x<RESET>><RED>b a<RESET><GREEN>y x<RESET>>=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>==<RED>b a<RESET><GREEN>y x<RESET>!=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>^<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>|<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>||<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>?<RED>b<RESET><GREEN>y<RESET>:z
+<RED>a<RESET><GREEN>x<RESET>=<RED>b a<RESET><GREEN>y x<RESET>+=<RED>b a<RESET><GREEN>y x<RESET>-=<RED>b a<RESET><GREEN>y x<RESET>*=<RED>b a<RESET><GREEN>y x<RESET>/=<RED>b a<RESET><GREEN>y x<RESET>%=<RED>b a<RESET><GREEN>y x<RESET><<=<RED>b a<RESET><GREEN>y x<RESET>>>=<RED>b a<RESET><GREEN>y x<RESET>&=<RED>b a<RESET><GREEN>y x<RESET>^=<RED>b a<RESET><GREEN>y x<RESET>|=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>,y
+<RED>a<RESET><GREEN>x<RESET>::<RED>b<RESET><GREEN>y<RESET>
diff --git a/t/t4034/java/post b/t/t4034/java/post
new file mode 100644
index 0000000..7e8c026
--- /dev/null
+++ b/t/t4034/java/post
@@ -0,0 +1,19 @@
+Foo() : x(0&42) { bar(x); }
+cout<<"Hello World?\n"<<endl;
+(1) (-1e10) (0xabcdef) 'y'
+[x] x->y x.y
+!x ~x x++ x-- x*y x&y
+x*y x/y x%y
+x+y x-y
+x<<y x>>y
+x<y x<=y x>y x>=y
+x==y x!=y
+x&y
+x^y
+x|y
+x&&y
+x||y
+x?y:z
+x=y x+=y x-=y x*=y x/=y x%=y x<<=y x>>=y x&=y x^=y x|=y
+x,y
+x::y
diff --git a/t/t4034/java/pre b/t/t4034/java/pre
new file mode 100644
index 0000000..23d5c8a
--- /dev/null
+++ b/t/t4034/java/pre
@@ -0,0 +1,19 @@
+Foo():x(0&&1){}
+cout<<"Hello World!\n"<<endl;
+1 -1e10 0xabcdef 'x'
+[a] a->b a.b
+!a ~a a++ a-- a*b a&b
+a*b a/b a%b
+a+b a-b
+a<<b a>>b
+a<b a<=b a>b a>=b
+a==b a!=b
+a&b
+a^b
+a|b
+a&&b
+a||b
+a?b:z
+a=b a+=b a-=b a*=b a/=b a%=b a<<=b a>>=b a&=b a^=b a|=b
+a,y
+a::b
diff --git a/t/t4034/objc/expect b/t/t4034/objc/expect
new file mode 100644
index 0000000..e5d1dd2
--- /dev/null
+++ b/t/t4034/objc/expect
@@ -0,0 +1,35 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 9106d63..dd5f421 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,18 +1,18 @@<RESET>
+Foo() : x(0<RED>&&1<RESET><GREEN>&42<RESET>) { <GREEN>bar(x);<RESET> }
+cout<<"Hello World<RED>!<RESET><GREEN>?<RESET>\n"<<endl;
+<GREEN>(<RESET>1<GREEN>) (<RESET>-1e10<GREEN>) (<RESET>0xabcdef<GREEN>)<RESET> '<RED>x<RESET><GREEN>y<RESET>'
+[<RED>a<RESET><GREEN>x<RESET>] <RED>a<RESET><GREEN>x<RESET>-><RED>b a<RESET><GREEN>y x<RESET>.<RED>b<RESET><GREEN>y<RESET>
+!<RED>a<RESET><GREEN>x<RESET> ~<RED>a a<RESET><GREEN>x x<RESET>++ <RED>a<RESET><GREEN>x<RESET>-- <RED>a<RESET><GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>/<RED>b a<RESET><GREEN>y x<RESET>%<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>+<RED>b a<RESET><GREEN>y x<RESET>-<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<<RED>b a<RESET><GREEN>y x<RESET>>><RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<RED>b a<RESET><GREEN>y x<RESET><=<RED>b a<RESET><GREEN>y x<RESET>><RED>b a<RESET><GREEN>y x<RESET>>=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>==<RED>b a<RESET><GREEN>y x<RESET>!=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>^<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>|<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>||<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>?<RED>b<RESET><GREEN>y<RESET>:z
+<RED>a<RESET><GREEN>x<RESET>=<RED>b a<RESET><GREEN>y x<RESET>+=<RED>b a<RESET><GREEN>y x<RESET>-=<RED>b a<RESET><GREEN>y x<RESET>*=<RED>b a<RESET><GREEN>y x<RESET>/=<RED>b a<RESET><GREEN>y x<RESET>%=<RED>b a<RESET><GREEN>y x<RESET><<=<RED>b a<RESET><GREEN>y x<RESET>>>=<RED>b a<RESET><GREEN>y x<RESET>&=<RED>b a<RESET><GREEN>y x<RESET>^=<RED>b a<RESET><GREEN>y x<RESET>|=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>,y
diff --git a/t/t4034/objc/post b/t/t4034/objc/post
new file mode 100644
index 0000000..dd5f421
--- /dev/null
+++ b/t/t4034/objc/post
@@ -0,0 +1,18 @@
+Foo() : x(0&42) { bar(x); }
+cout<<"Hello World?\n"<<endl;
+(1) (-1e10) (0xabcdef) 'y'
+[x] x->y x.y
+!x ~x x++ x-- x*y x&y
+x*y x/y x%y
+x+y x-y
+x<<y x>>y
+x<y x<=y x>y x>=y
+x==y x!=y
+x&y
+x^y
+x|y
+x&&y
+x||y
+x?y:z
+x=y x+=y x-=y x*=y x/=y x%=y x<<=y x>>=y x&=y x^=y x|=y
+x,y
diff --git a/t/t4034/objc/pre b/t/t4034/objc/pre
new file mode 100644
index 0000000..9106d63
--- /dev/null
+++ b/t/t4034/objc/pre
@@ -0,0 +1,18 @@
+Foo():x(0&&1){}
+cout<<"Hello World!\n"<<endl;
+1 -1e10 0xabcdef 'x'
+[a] a->b a.b
+!a ~a a++ a-- a*b a&b
+a*b a/b a%b
+a+b a-b
+a<<b a>>b
+a<b a<=b a>b a>=b
+a==b a!=b
+a&b
+a^b
+a|b
+a&&b
+a||b
+a?b:z
+a=b a+=b a-=b a*=b a/=b a%=b a<<=b a>>=b a&=b a^=b a|=b
+a,y
diff --git a/t/t4034/pascal/expect b/t/t4034/pascal/expect
new file mode 100644
index 0000000..2ce4230
--- /dev/null
+++ b/t/t4034/pascal/expect
@@ -0,0 +1,35 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 077046c..8865e6b 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,18 +1,18 @@<RESET>
+writeln("Hello World<RED>!<RESET><GREEN>?<RESET>");
+<GREEN>(<RESET>1<GREEN>) (<RESET>-1e10<GREEN>) (<RESET>0xabcdef<GREEN>)<RESET> '<RED>x<RESET><GREEN>y<RESET>'
+[<RED>a<RESET><GREEN>x<RESET>] <RED>a<RESET><GREEN>x<RESET>-><RED>b a<RESET><GREEN>y x<RESET>.<RED>b<RESET><GREEN>y<RESET>
+!<RED>a<RESET><GREEN>x<RESET> ~<RED>a a<RESET><GREEN>x x<RESET>++ <RED>a<RESET><GREEN>x<RESET>-- <RED>a<RESET><GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>/<RED>b a<RESET><GREEN>y x<RESET>%<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>+<RED>b a<RESET><GREEN>y x<RESET>-<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<<RED>b a<RESET><GREEN>y x<RESET>>><RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<RED>b a<RESET><GREEN>y x<RESET><=<RED>b a<RESET><GREEN>y x<RESET>><RED>b a<RESET><GREEN>y x<RESET>>=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>==<RED>b a<RESET><GREEN>y x<RESET>!=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>^<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>|<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>||<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>?<RED>b<RESET><GREEN>y<RESET>:z
+<RED>a<RESET><GREEN>x<RESET>=<RED>b a<RESET><GREEN>y x<RESET>+=<RED>b a<RESET><GREEN>y x<RESET>-=<RED>b a<RESET><GREEN>y x<RESET>*=<RED>b a<RESET><GREEN>y x<RESET>/=<RED>b a<RESET><GREEN>y x<RESET>%=<RED>b a<RESET><GREEN>y x<RESET><<=<RED>b a<RESET><GREEN>y x<RESET>>>=<RED>b a<RESET><GREEN>y x<RESET>&=<RED>b a<RESET><GREEN>y x<RESET>^=<RED>b a<RESET><GREEN>y x<RESET>|=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>,y
+<RED>a<RESET><GREEN>x<RESET>::<RED>b<RESET><GREEN>y<RESET>
diff --git a/t/t4034/pascal/post b/t/t4034/pascal/post
new file mode 100644
index 0000000..8865e6b
--- /dev/null
+++ b/t/t4034/pascal/post
@@ -0,0 +1,18 @@
+writeln("Hello World?");
+(1) (-1e10) (0xabcdef) 'y'
+[x] x->y x.y
+!x ~x x++ x-- x*y x&y
+x*y x/y x%y
+x+y x-y
+x<<y x>>y
+x<y x<=y x>y x>=y
+x==y x!=y
+x&y
+x^y
+x|y
+x&&y
+x||y
+x?y:z
+x=y x+=y x-=y x*=y x/=y x%=y x<<=y x>>=y x&=y x^=y x|=y
+x,y
+x::y
diff --git a/t/t4034/pascal/pre b/t/t4034/pascal/pre
new file mode 100644
index 0000000..077046c
--- /dev/null
+++ b/t/t4034/pascal/pre
@@ -0,0 +1,18 @@
+writeln("Hello World!");
+1 -1e10 0xabcdef 'x'
+[a] a->b a.b
+!a ~a a++ a-- a*b a&b
+a*b a/b a%b
+a+b a-b
+a<<b a>>b
+a<b a<=b a>b a>=b
+a==b a!=b
+a&b
+a^b
+a|b
+a&&b
+a||b
+a?b:z
+a=b a+=b a-=b a*=b a/=b a%=b a<<=b a>>=b a&=b a^=b a|=b
+a,y
+a::b
diff --git a/t/t4034/php/expect b/t/t4034/php/expect
new file mode 100644
index 0000000..0404408
--- /dev/null
+++ b/t/t4034/php/expect
@@ -0,0 +1,35 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index cf6e06b..4420a49 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,18 +1,18 @@<RESET>
+<GREEN>(<RESET>$var<GREEN>)<RESET> $ var
+<?="Hello World<RED>!<RESET><GREEN>?<RESET>"?>
+<GREEN>(<RESET>1<GREEN>) (<RESET>-1e10<GREEN>) (<RESET>0xabcdef<GREEN>)<RESET> '<RED>x<RESET><GREEN>y<RESET>'
+[<RED>a<RESET><GREEN>x<RESET>] <RED>a<RESET><GREEN>x<RESET>-><RED>b a<RESET><GREEN>y x<RESET>.<RED>b<RESET><GREEN>y<RESET>
+!<RED>a<RESET><GREEN>x<RESET> ~<RED>a a<RESET><GREEN>x x<RESET>++ <RED>a<RESET><GREEN>x<RESET>-- <RED>a<RESET><GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>/<RED>b a<RESET><GREEN>y x<RESET>%<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>+<RED>b a<RESET><GREEN>y x<RESET>-<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<<RED>b a<RESET><GREEN>y x<RESET>>><RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<RED>b a<RESET><GREEN>y x<RESET><=<RED>b a<RESET><GREEN>y x<RESET>><RED>b a<RESET><GREEN>y x<RESET>>=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>==<RED>b a<RESET><GREEN>y x<RESET>!=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>^<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>|<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>||<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>?<RED>b<RESET><GREEN>y<RESET>:z
+<RED>a<RESET><GREEN>x<RESET>=<RED>b a<RESET><GREEN>y x<RESET>+=<RED>b a<RESET><GREEN>y x<RESET>-=<RED>b a<RESET><GREEN>y x<RESET>*=<RED>b a<RESET><GREEN>y x<RESET>/=<RED>b a<RESET><GREEN>y x<RESET>%=<RED>b a<RESET><GREEN>y x<RESET><<=<RED>b a<RESET><GREEN>y x<RESET>>>=<RED>b a<RESET><GREEN>y x<RESET>&=<RED>b a<RESET><GREEN>y x<RESET>^=<RED>b a<RESET><GREEN>y x<RESET>|=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>,y
diff --git a/t/t4034/php/post b/t/t4034/php/post
new file mode 100644
index 0000000..4420a49
--- /dev/null
+++ b/t/t4034/php/post
@@ -0,0 +1,18 @@
+($var) $ var
+<?="Hello World?"?>
+(1) (-1e10) (0xabcdef) 'y'
+[x] x->y x.y
+!x ~x x++ x-- x*y x&y
+x*y x/y x%y
+x+y x-y
+x<<y x>>y
+x<y x<=y x>y x>=y
+x==y x!=y
+x&y
+x^y
+x|y
+x&&y
+x||y
+x?y:z
+x=y x+=y x-=y x*=y x/=y x%=y x<<=y x>>=y x&=y x^=y x|=y
+x,y
diff --git a/t/t4034/php/pre b/t/t4034/php/pre
new file mode 100644
index 0000000..cf6e06b
--- /dev/null
+++ b/t/t4034/php/pre
@@ -0,0 +1,18 @@
+$var $var
+<?= "Hello World!" ?>
+1 -1e10 0xabcdef 'x'
+[a] a->b a.b
+!a ~a a++ a-- a*b a&b
+a*b a/b a%b
+a+b a-b
+a<<b a>>b
+a<b a<=b a>b a>=b
+a==b a!=b
+a&b
+a^b
+a|b
+a&&b
+a||b
+a?b:z
+a=b a+=b a-=b a*=b a/=b a%=b a<<=b a>>=b a&=b a^=b a|=b
+a,y
diff --git a/t/t4034/python/expect b/t/t4034/python/expect
new file mode 100644
index 0000000..8abb8a4
--- /dev/null
+++ b/t/t4034/python/expect
@@ -0,0 +1,34 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 438f776..68baf34 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,17 +1,17 @@<RESET>
+print<RED>u<RESET> "Hello World<RED>!<RESET><GREEN>?<RESET>\n"<GREEN>; print<RESET>
+<GREEN>(<RESET>1<GREEN>) (<RESET>-1e10<GREEN>) (<RESET>0xabcdef<GREEN>) u<RESET>'<RED>x<RESET><GREEN>y<RESET>'
+[<RED>a<RESET><GREEN>x<RESET>] <RED>a<RESET><GREEN>x<RESET>-><RED>b a<RESET><GREEN>y x<RESET>.<RED>b<RESET><GREEN>y<RESET>
+!<RED>a<RESET><GREEN>x<RESET> ~<RED>a a<RESET><GREEN>x x<RESET>++ <RED>a<RESET><GREEN>x<RESET>-- <RED>a<RESET><GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>/<RED>b a<RESET><GREEN>y x<RESET>%<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>+<RED>b a<RESET><GREEN>y x<RESET>-<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<<RED>b a<RESET><GREEN>y x<RESET>>><RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<RED>b a<RESET><GREEN>y x<RESET><=<RED>b a<RESET><GREEN>y x<RESET>><RED>b a<RESET><GREEN>y x<RESET>>=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>==<RED>b a<RESET><GREEN>y x<RESET>!=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>^<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>|<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>||<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>?<RED>b<RESET><GREEN>y<RESET>:z
+<RED>a<RESET><GREEN>x<RESET>=<RED>b a<RESET><GREEN>y x<RESET>+=<RED>b a<RESET><GREEN>y x<RESET>-=<RED>b a<RESET><GREEN>y x<RESET>*=<RED>b a<RESET><GREEN>y x<RESET>/=<RED>b a<RESET><GREEN>y x<RESET>%=<RED>b a<RESET><GREEN>y x<RESET><<=<RED>b a<RESET><GREEN>y x<RESET>>>=<RED>b a<RESET><GREEN>y x<RESET>&=<RED>b a<RESET><GREEN>y x<RESET>^=<RED>b a<RESET><GREEN>y x<RESET>|=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>,y
diff --git a/t/t4034/python/post b/t/t4034/python/post
new file mode 100644
index 0000000..68baf34
--- /dev/null
+++ b/t/t4034/python/post
@@ -0,0 +1,17 @@
+print "Hello World?\n"; print
+(1) (-1e10) (0xabcdef) u'y'
+[x] x->y x.y
+!x ~x x++ x-- x*y x&y
+x*y x/y x%y
+x+y x-y
+x<<y x>>y
+x<y x<=y x>y x>=y
+x==y x!=y
+x&y
+x^y
+x|y
+x&&y
+x||y
+x?y:z
+x=y x+=y x-=y x*=y x/=y x%=y x<<=y x>>=y x&=y x^=y x|=y
+x,y
diff --git a/t/t4034/python/pre b/t/t4034/python/pre
new file mode 100644
index 0000000..438f776
--- /dev/null
+++ b/t/t4034/python/pre
@@ -0,0 +1,17 @@
+print u"Hello World!\n"
+1 -1e10 0xabcdef 'x'
+[a] a->b a.b
+!a ~a a++ a-- a*b a&b
+a*b a/b a%b
+a+b a-b
+a<<b a>>b
+a<b a<=b a>b a>=b
+a==b a!=b
+a&b
+a^b
+a|b
+a&&b
+a||b
+a?b:z
+a=b a+=b a-=b a*=b a/=b a%=b a<<=b a>>=b a&=b a^=b a|=b
+a,y
diff --git a/t/t4034/ruby/expect b/t/t4034/ruby/expect
new file mode 100644
index 0000000..16e1dd5
--- /dev/null
+++ b/t/t4034/ruby/expect
@@ -0,0 +1,34 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 30ed9a1..7678f14 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,17 +1,17 @@<RESET>
+10.downto(1) {|<RED>x<RESET><GREEN>y<RESET>| puts <RED>x<RESET><GREEN>y<RESET>}
+<GREEN>(<RESET>1<GREEN>) (<RESET>-1e10<GREEN>) (<RESET>0xabcdef<GREEN>)<RESET> '<RED>x<RESET><GREEN>y<RESET>'
+[<RED>a<RESET><GREEN>x<RESET>] <RED>a<RESET><GREEN>x<RESET>-><RED>b a<RESET><GREEN>y x<RESET>.<RED>b<RESET><GREEN>y<RESET>
+!<RED>a<RESET><GREEN>x<RESET> ~<RED>a a<RESET><GREEN>x x<RESET>++ <RED>a<RESET><GREEN>x<RESET>-- <RED>a<RESET><GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>/<RED>b a<RESET><GREEN>y x<RESET>%<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>+<RED>b a<RESET><GREEN>y x<RESET>-<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<<RED>b a<RESET><GREEN>y x<RESET>>><RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<RED>b a<RESET><GREEN>y x<RESET><=<RED>b a<RESET><GREEN>y x<RESET>><RED>b a<RESET><GREEN>y x<RESET>>=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>==<RED>b a<RESET><GREEN>y x<RESET>!=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>^<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>|<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>||<RED>b<RESET>
+<RED>a?b<RESET><GREEN>y<RESET>
+<GREEN>x?y<RESET>:z
+<RED>a<RESET><GREEN>x<RESET>=<RED>b a<RESET><GREEN>y x<RESET>+=<RED>b a<RESET><GREEN>y x<RESET>-=<RED>b a<RESET><GREEN>y x<RESET>*=<RED>b a<RESET><GREEN>y x<RESET>/=<RED>b a<RESET><GREEN>y x<RESET>%=<RED>b a<RESET><GREEN>y x<RESET><<=<RED>b a<RESET><GREEN>y x<RESET>>>=<RED>b a<RESET><GREEN>y x<RESET>&=<RED>b a<RESET><GREEN>y x<RESET>^=<RED>b a<RESET><GREEN>y x<RESET>|=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>,y
diff --git a/t/t4034/ruby/post b/t/t4034/ruby/post
new file mode 100644
index 0000000..7678f14
--- /dev/null
+++ b/t/t4034/ruby/post
@@ -0,0 +1,17 @@
+10.downto(1) {|y| puts y}
+(1) (-1e10) (0xabcdef) 'y'
+[x] x->y x.y
+!x ~x x++ x-- x*y x&y
+x*y x/y x%y
+x+y x-y
+x<<y x>>y
+x<y x<=y x>y x>=y
+x==y x!=y
+x&y
+x^y
+x|y
+x&&y
+x||y
+x?y:z
+x=y x+=y x-=y x*=y x/=y x%=y x<<=y x>>=y x&=y x^=y x|=y
+x,y
diff --git a/t/t4034/ruby/pre b/t/t4034/ruby/pre
new file mode 100644
index 0000000..30ed9a1
--- /dev/null
+++ b/t/t4034/ruby/pre
@@ -0,0 +1,17 @@
+10.downto(1) {|x| puts x}
+1 -1e10 0xabcdef 'x'
+[a] a->b a.b
+!a ~a a++ a-- a*b a&b
+a*b a/b a%b
+a+b a-b
+a<<b a>>b
+a<b a<=b a>b a>=b
+a==b a!=b
+a&b
+a^b
+a|b
+a&&b
+a||b
+a?b:z
+a=b a+=b a-=b a*=b a/=b a%=b a<<=b a>>=b a&=b a^=b a|=b
+a,y
diff --git a/t/t4034/tex/expect b/t/t4034/tex/expect
new file mode 100644
index 0000000..604969b
--- /dev/null
+++ b/t/t4034/tex/expect
@@ -0,0 +1,9 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 2b2dfcb..65cab61 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,4 +1,4 @@<RESET>
+\section{Something <GREEN>new<RESET>}
+<RED>\emph<RESET><GREEN>\textbf<RESET>{Macro style}
+{<RED>\em<RESET><GREEN>\bfseries<RESET> State toggle style}
+\\[<RED>1em<RESET><GREEN>1cm<RESET>]
diff --git a/t/t4034/tex/post b/t/t4034/tex/post
new file mode 100644
index 0000000..65cab61
--- /dev/null
+++ b/t/t4034/tex/post
@@ -0,0 +1,4 @@
+\section{Something new}
+\textbf{Macro style}
+{\bfseries State toggle style}
+\\[1cm]
diff --git a/t/t4034/tex/pre b/t/t4034/tex/pre
new file mode 100644
index 0000000..2b2dfcb
--- /dev/null
+++ b/t/t4034/tex/pre
@@ -0,0 +1,4 @@
+\section{Something}
+\emph{Macro style}
+{\em State toggle style}
+\\[1em]

-- 
1.7.3.4.789.g74ad1

Jonathan Nieder· Jan 11, 2011, 21:47 UTC · re: Thomas Rast · lore

[RFC/PATCH 0/3] Re: t4034: bulk verify builtin word regex sanity

Thomas Rast wrote:

> The builtin word regexes should be tested with some simple examples
> against simple issues, like failing to match a non-space character.
> Do this in bulk.

The above patch depends on "diff.c: implement a sanity check for word regexes" but not in any essential way. Patch 1 below is the part that is still relevant without it.

Patch 2 changes the UTF-8 catchall to match a single non-ASCII character[1], at the same time as making it harder to forget to use. (My motivation is that the UTF-8 catchall is missing in the new perl support.)

Patch 3 contains some cosmetic tweaks to the tests. They were meant as preparations for patch 2 but I checkened out and stopped there.

Thoughts and improvements welcome, as always.

Jonathan Nieder (2):
  userdiff: simplify word-diff safeguard
  t4034 (diff --word-diff): style suggestions

Thomas Rast (1):
  t4034: bulk verify builtin word regex sanity

 t/t4034-diff-words.sh  |  463 +++++++++++++++++++++++-------------------------
 t/t4034/bibtex/expect  |   15 ++
 t/t4034/bibtex/post    |   10 +
 t/t4034/bibtex/pre     |    9 +
 t/t4034/cpp/expect     |   36 ++++
 t/t4034/cpp/post       |   19 ++
 t/t4034/cpp/pre        |   19 ++
 t/t4034/csharp/expect  |   35 ++++
 t/t4034/csharp/post    |   18 ++
 t/t4034/csharp/pre     |   18 ++
 t/t4034/fortran/expect |   10 +
 t/t4034/fortran/post   |    5 +
 t/t4034/fortran/pre    |    5 +
 t/t4034/html/expect    |    8 +
 t/t4034/html/post      |    3 +
 t/t4034/html/pre       |    3 +
 t/t4034/java/expect    |   36 ++++
 t/t4034/java/post      |   19 ++
 t/t4034/java/pre       |   19 ++
 t/t4034/objc/expect    |   35 ++++
 t/t4034/objc/post      |   18 ++
 t/t4034/objc/pre       |   18 ++
 t/t4034/pascal/expect  |   35 ++++
 t/t4034/pascal/post    |   18 ++
 t/t4034/pascal/pre     |   18 ++
 t/t4034/php/expect     |   35 ++++
 t/t4034/php/post       |   18 ++
 t/t4034/php/pre        |   18 ++
 t/t4034/python/expect  |   34 ++++
 t/t4034/python/post    |   17 ++
 t/t4034/python/pre     |   17 ++
 t/t4034/ruby/expect    |   34 ++++
 t/t4034/ruby/post      |   17 ++
 t/t4034/ruby/pre       |   17 ++
 t/t4034/tex/expect     |    9 +
 t/t4034/tex/post       |    4 +
 t/t4034/tex/pre        |    4 +
 userdiff.c             |   37 ++---
 38 files changed, 887 insertions(+), 266 deletions(-)
 create mode 100644 t/t4034/bibtex/expect
 create mode 100644 t/t4034/bibtex/post
 create mode 100644 t/t4034/bibtex/pre
 create mode 100644 t/t4034/cpp/expect
 create mode 100644 t/t4034/cpp/post
 create mode 100644 t/t4034/cpp/pre
 create mode 100644 t/t4034/csharp/expect
 create mode 100644 t/t4034/csharp/post
 create mode 100644 t/t4034/csharp/pre
 create mode 100644 t/t4034/fortran/expect
 create mode 100644 t/t4034/fortran/post
 create mode 100644 t/t4034/fortran/pre
 create mode 100644 t/t4034/html/expect
 create mode 100644 t/t4034/html/post
 create mode 100644 t/t4034/html/pre
 create mode 100644 t/t4034/java/expect
 create mode 100644 t/t4034/java/post
 create mode 100644 t/t4034/java/pre
 create mode 100644 t/t4034/objc/expect
 create mode 100644 t/t4034/objc/post
 create mode 100644 t/t4034/objc/pre
 create mode 100644 t/t4034/pascal/expect
 create mode 100644 t/t4034/pascal/post
 create mode 100644 t/t4034/pascal/pre
 create mode 100644 t/t4034/php/expect
 create mode 100644 t/t4034/php/post
 create mode 100644 t/t4034/php/pre
 create mode 100644 t/t4034/python/expect
 create mode 100644 t/t4034/python/post
 create mode 100644 t/t4034/python/pre
 create mode 100644 t/t4034/ruby/expect
 create mode 100644 t/t4034/ruby/post
 create mode 100644 t/t4034/ruby/pre
 create mode 100644 t/t4034/tex/expect
 create mode 100644 t/t4034/tex/post
 create mode 100644 t/t4034/tex/pre

[1] suggested in <201012261206.11942.trast@student.ethz.ch>, which is missing from gmane for some reason.

Jonathan Nieder· Jan 11, 2011, 21:48 UTC · re: Jonathan Nieder · lore

[PATCH 1/3] t4034: bulk verify builtin word regex sanity

From: Thomas Rast <trast@student.ethz.ch>
Date: Sat, 18 Dec 2010 17:17:54 +0100

The builtin word regexes should be tested with some simple examples against simple issues. Do this in bulk.

Still, they are good enough to already have uncovered a typo in the python and ruby patterns.

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
---
 t/t4034-diff-words.sh  |   15 +++++++++++++++
 t/t4034/bibtex/expect  |   15 +++++++++++++++
 t/t4034/bibtex/post    |   10 ++++++++++
 t/t4034/bibtex/pre     |    9 +++++++++
 t/t4034/cpp/expect     |   36 ++++++++++++++++++++++++++++++++++++
 t/t4034/cpp/post       |   19 +++++++++++++++++++
 t/t4034/cpp/pre        |   19 +++++++++++++++++++
 t/t4034/csharp/expect  |   35 +++++++++++++++++++++++++++++++++++
 t/t4034/csharp/post    |   18 ++++++++++++++++++
 t/t4034/csharp/pre     |   18 ++++++++++++++++++
 t/t4034/fortran/expect |   10 ++++++++++
 t/t4034/fortran/post   |    5 +++++
 t/t4034/fortran/pre    |    5 +++++
 t/t4034/html/expect    |    8 ++++++++
 t/t4034/html/post      |    3 +++
 t/t4034/html/pre       |    3 +++
 t/t4034/java/expect    |   36 ++++++++++++++++++++++++++++++++++++
 t/t4034/java/post      |   19 +++++++++++++++++++
 t/t4034/java/pre       |   19 +++++++++++++++++++
 t/t4034/objc/expect    |   35 +++++++++++++++++++++++++++++++++++
 t/t4034/objc/post      |   18 ++++++++++++++++++
 t/t4034/objc/pre       |   18 ++++++++++++++++++
 t/t4034/pascal/expect  |   35 +++++++++++++++++++++++++++++++++++
 t/t4034/pascal/post    |   18 ++++++++++++++++++
 t/t4034/pascal/pre     |   18 ++++++++++++++++++
 t/t4034/php/expect     |   35 +++++++++++++++++++++++++++++++++++
 t/t4034/php/post       |   18 ++++++++++++++++++
 t/t4034/php/pre        |   18 ++++++++++++++++++
 t/t4034/python/expect  |   34 ++++++++++++++++++++++++++++++++++
 t/t4034/python/post    |   17 +++++++++++++++++
 t/t4034/python/pre     |   17 +++++++++++++++++
 t/t4034/ruby/expect    |   34 ++++++++++++++++++++++++++++++++++
 t/t4034/ruby/post      |   17 +++++++++++++++++
 t/t4034/ruby/pre       |   17 +++++++++++++++++
 t/t4034/tex/expect     |    9 +++++++++
 t/t4034/tex/post       |    4 ++++
 t/t4034/tex/pre        |    4 ++++
 37 files changed, 668 insertions(+), 0 deletions(-)
 create mode 100644 t/t4034/bibtex/expect
 create mode 100644 t/t4034/bibtex/post
 create mode 100644 t/t4034/bibtex/pre
 create mode 100644 t/t4034/cpp/expect
 create mode 100644 t/t4034/cpp/post
 create mode 100644 t/t4034/cpp/pre
 create mode 100644 t/t4034/csharp/expect
 create mode 100644 t/t4034/csharp/post
 create mode 100644 t/t4034/csharp/pre
 create mode 100644 t/t4034/fortran/expect
 create mode 100644 t/t4034/fortran/post
 create mode 100644 t/t4034/fortran/pre
 create mode 100644 t/t4034/html/expect
 create mode 100644 t/t4034/html/post
 create mode 100644 t/t4034/html/pre
 create mode 100644 t/t4034/java/expect
 create mode 100644 t/t4034/java/post
 create mode 100644 t/t4034/java/pre
 create mode 100644 t/t4034/objc/expect
 create mode 100644 t/t4034/objc/post
 create mode 100644 t/t4034/objc/pre
 create mode 100644 t/t4034/pascal/expect
 create mode 100644 t/t4034/pascal/post
 create mode 100644 t/t4034/pascal/pre
 create mode 100644 t/t4034/php/expect
 create mode 100644 t/t4034/php/post
 create mode 100644 t/t4034/php/pre
 create mode 100644 t/t4034/python/expect
 create mode 100644 t/t4034/python/post
 create mode 100644 t/t4034/python/pre
 create mode 100644 t/t4034/ruby/expect
 create mode 100644 t/t4034/ruby/post
 create mode 100644 t/t4034/ruby/pre
 create mode 100644 t/t4034/tex/expect
 create mode 100644 t/t4034/tex/post
 create mode 100644 t/t4034/tex/pre

Show changes to 37 files +668 −0

diff --git a/t/t4034-diff-words.sh b/t/t4034-diff-words.sh
index 8096d8a..2647191 100755
--- a/t/t4034-diff-words.sh
+++ b/t/t4034-diff-words.sh
@@ -331,4 +331,19 @@ test_expect_success '--word-diff=none' '
 
 '
 
+word_diff_for_language () {
+	cp "$TEST_DIRECTORY/t4034/$1/pre" \
+		"$TEST_DIRECTORY/t4034/$1/post" \
+		"$TEST_DIRECTORY/t4034/$1/expect" . &&
+	echo "* diff=$1" >.gitattributes &&
+	word_diff --color-words && cp output output.$1
+}
+
+for lang_dir in $TEST_DIRECTORY/t4034/*; do
+	lang=${lang_dir#$TEST_DIRECTORY/t4034/}
+	test_expect_success "diff driver '$lang' has sane word regex" "
+		word_diff_for_language $lang
+	"
+done
+
 test_done
diff --git a/t/t4034/bibtex/expect b/t/t4034/bibtex/expect
new file mode 100644
index 0000000..a157774
--- /dev/null
+++ b/t/t4034/bibtex/expect
@@ -0,0 +1,15 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 95cd55b..ddcba9b 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,9 +1,10 @@<RESET>
+@article{aldous1987uie,<RESET>
+  title={{Ultimate instability of exponential back-off protocol for acknowledgment-based transmission control of random access communication channels}},<RESET>
+  author={Aldous, <RED>D.<RESET><GREEN>David<RESET>},
+  journal={Information Theory, IEEE Transactions on},<RESET>
+  volume={<RED>33<RESET><GREEN>Bogus.<RESET>},
+  number={<RED>2<RESET><GREEN>4<RESET>},
+  pages={219--223},<RESET>
+  year=<GREEN>1987,<RESET>
+<GREEN>  note={This is in fact a rather funny read since ethernet works well in practice. The<RESET> {<RED>1987<RESET><GREEN>\em pre} reference is the right one, however.<RESET>}<RED>,<RESET>
+}<RESET>
diff --git a/t/t4034/bibtex/post b/t/t4034/bibtex/post
new file mode 100644
index 0000000..ddcba9b
--- /dev/null
+++ b/t/t4034/bibtex/post
@@ -0,0 +1,10 @@
+@article{aldous1987uie,
+  title={{Ultimate instability of exponential back-off protocol for acknowledgment-based transmission control of random access communication channels}},
+  author={Aldous, David},
+  journal={Information Theory, IEEE Transactions on},
+  volume={Bogus.},
+  number={4},
+  pages={219--223},
+  year=1987,
+  note={This is in fact a rather funny read since ethernet works well in practice. The {\em pre} reference is the right one, however.}
+}
diff --git a/t/t4034/bibtex/pre b/t/t4034/bibtex/pre
new file mode 100644
index 0000000..95cd55b
--- /dev/null
+++ b/t/t4034/bibtex/pre
@@ -0,0 +1,9 @@
+@article{aldous1987uie,
+  title={{Ultimate instability of exponential back-off protocol for acknowledgment-based transmission control of random access communication channels}},
+  author={Aldous, D.},
+  journal={Information Theory, IEEE Transactions on},
+  volume={33},
+  number={2},
+  pages={219--223},
+  year={1987},
+}
diff --git a/t/t4034/cpp/expect b/t/t4034/cpp/expect
new file mode 100644
index 0000000..37d1ea2
--- /dev/null
+++ b/t/t4034/cpp/expect
@@ -0,0 +1,36 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 23d5c8a..7e8c026 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,19 +1,19 @@<RESET>
+Foo() : x(0<RED>&&1<RESET><GREEN>&42<RESET>) { <GREEN>bar(x);<RESET> }
+cout<<"Hello World<RED>!<RESET><GREEN>?<RESET>\n"<<endl;
+<GREEN>(<RESET>1<GREEN>) (<RESET>-1e10<GREEN>) (<RESET>0xabcdef<GREEN>)<RESET> '<RED>x<RESET><GREEN>y<RESET>'
+[<RED>a<RESET><GREEN>x<RESET>] <RED>a<RESET><GREEN>x<RESET>-><RED>b a<RESET><GREEN>y x<RESET>.<RED>b<RESET><GREEN>y<RESET>
+!<RED>a<RESET><GREEN>x<RESET> ~<RED>a a<RESET><GREEN>x x<RESET>++ <RED>a<RESET><GREEN>x<RESET>-- <RED>a<RESET><GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>/<RED>b a<RESET><GREEN>y x<RESET>%<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>+<RED>b a<RESET><GREEN>y x<RESET>-<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<<RED>b a<RESET><GREEN>y x<RESET>>><RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<RED>b a<RESET><GREEN>y x<RESET><=<RED>b a<RESET><GREEN>y x<RESET>><RED>b a<RESET><GREEN>y x<RESET>>=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>==<RED>b a<RESET><GREEN>y x<RESET>!=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>^<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>|<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>||<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>?<RED>b<RESET><GREEN>y<RESET>:z
+<RED>a<RESET><GREEN>x<RESET>=<RED>b a<RESET><GREEN>y x<RESET>+=<RED>b a<RESET><GREEN>y x<RESET>-=<RED>b a<RESET><GREEN>y x<RESET>*=<RED>b a<RESET><GREEN>y x<RESET>/=<RED>b a<RESET><GREEN>y x<RESET>%=<RED>b a<RESET><GREEN>y x<RESET><<=<RED>b a<RESET><GREEN>y x<RESET>>>=<RED>b a<RESET><GREEN>y x<RESET>&=<RED>b a<RESET><GREEN>y x<RESET>^=<RED>b a<RESET><GREEN>y x<RESET>|=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>,y
+<RED>a<RESET><GREEN>x<RESET>::<RED>b<RESET><GREEN>y<RESET>
diff --git a/t/t4034/cpp/post b/t/t4034/cpp/post
new file mode 100644
index 0000000..7e8c026
--- /dev/null
+++ b/t/t4034/cpp/post
@@ -0,0 +1,19 @@
+Foo() : x(0&42) { bar(x); }
+cout<<"Hello World?\n"<<endl;
+(1) (-1e10) (0xabcdef) 'y'
+[x] x->y x.y
+!x ~x x++ x-- x*y x&y
+x*y x/y x%y
+x+y x-y
+x<<y x>>y
+x<y x<=y x>y x>=y
+x==y x!=y
+x&y
+x^y
+x|y
+x&&y
+x||y
+x?y:z
+x=y x+=y x-=y x*=y x/=y x%=y x<<=y x>>=y x&=y x^=y x|=y
+x,y
+x::y
diff --git a/t/t4034/cpp/pre b/t/t4034/cpp/pre
new file mode 100644
index 0000000..23d5c8a
--- /dev/null
+++ b/t/t4034/cpp/pre
@@ -0,0 +1,19 @@
+Foo():x(0&&1){}
+cout<<"Hello World!\n"<<endl;
+1 -1e10 0xabcdef 'x'
+[a] a->b a.b
+!a ~a a++ a-- a*b a&b
+a*b a/b a%b
+a+b a-b
+a<<b a>>b
+a<b a<=b a>b a>=b
+a==b a!=b
+a&b
+a^b
+a|b
+a&&b
+a||b
+a?b:z
+a=b a+=b a-=b a*=b a/=b a%=b a<<=b a>>=b a&=b a^=b a|=b
+a,y
+a::b
diff --git a/t/t4034/csharp/expect b/t/t4034/csharp/expect
new file mode 100644
index 0000000..e5d1dd2
--- /dev/null
+++ b/t/t4034/csharp/expect
@@ -0,0 +1,35 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 9106d63..dd5f421 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,18 +1,18 @@<RESET>
+Foo() : x(0<RED>&&1<RESET><GREEN>&42<RESET>) { <GREEN>bar(x);<RESET> }
+cout<<"Hello World<RED>!<RESET><GREEN>?<RESET>\n"<<endl;
+<GREEN>(<RESET>1<GREEN>) (<RESET>-1e10<GREEN>) (<RESET>0xabcdef<GREEN>)<RESET> '<RED>x<RESET><GREEN>y<RESET>'
+[<RED>a<RESET><GREEN>x<RESET>] <RED>a<RESET><GREEN>x<RESET>-><RED>b a<RESET><GREEN>y x<RESET>.<RED>b<RESET><GREEN>y<RESET>
+!<RED>a<RESET><GREEN>x<RESET> ~<RED>a a<RESET><GREEN>x x<RESET>++ <RED>a<RESET><GREEN>x<RESET>-- <RED>a<RESET><GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>/<RED>b a<RESET><GREEN>y x<RESET>%<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>+<RED>b a<RESET><GREEN>y x<RESET>-<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<<RED>b a<RESET><GREEN>y x<RESET>>><RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<RED>b a<RESET><GREEN>y x<RESET><=<RED>b a<RESET><GREEN>y x<RESET>><RED>b a<RESET><GREEN>y x<RESET>>=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>==<RED>b a<RESET><GREEN>y x<RESET>!=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>^<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>|<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>||<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>?<RED>b<RESET><GREEN>y<RESET>:z
+<RED>a<RESET><GREEN>x<RESET>=<RED>b a<RESET><GREEN>y x<RESET>+=<RED>b a<RESET><GREEN>y x<RESET>-=<RED>b a<RESET><GREEN>y x<RESET>*=<RED>b a<RESET><GREEN>y x<RESET>/=<RED>b a<RESET><GREEN>y x<RESET>%=<RED>b a<RESET><GREEN>y x<RESET><<=<RED>b a<RESET><GREEN>y x<RESET>>>=<RED>b a<RESET><GREEN>y x<RESET>&=<RED>b a<RESET><GREEN>y x<RESET>^=<RED>b a<RESET><GREEN>y x<RESET>|=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>,y
diff --git a/t/t4034/csharp/post b/t/t4034/csharp/post
new file mode 100644
index 0000000..dd5f421
--- /dev/null
+++ b/t/t4034/csharp/post
@@ -0,0 +1,18 @@
+Foo() : x(0&42) { bar(x); }
+cout<<"Hello World?\n"<<endl;
+(1) (-1e10) (0xabcdef) 'y'
+[x] x->y x.y
+!x ~x x++ x-- x*y x&y
+x*y x/y x%y
+x+y x-y
+x<<y x>>y
+x<y x<=y x>y x>=y
+x==y x!=y
+x&y
+x^y
+x|y
+x&&y
+x||y
+x?y:z
+x=y x+=y x-=y x*=y x/=y x%=y x<<=y x>>=y x&=y x^=y x|=y
+x,y
diff --git a/t/t4034/csharp/pre b/t/t4034/csharp/pre
new file mode 100644
index 0000000..9106d63
--- /dev/null
+++ b/t/t4034/csharp/pre
@@ -0,0 +1,18 @@
+Foo():x(0&&1){}
+cout<<"Hello World!\n"<<endl;
+1 -1e10 0xabcdef 'x'
+[a] a->b a.b
+!a ~a a++ a-- a*b a&b
+a*b a/b a%b
+a+b a-b
+a<<b a>>b
+a<b a<=b a>b a>=b
+a==b a!=b
+a&b
+a^b
+a|b
+a&&b
+a||b
+a?b:z
+a=b a+=b a-=b a*=b a/=b a%=b a<<=b a>>=b a&=b a^=b a|=b
+a,y
diff --git a/t/t4034/fortran/expect b/t/t4034/fortran/expect
new file mode 100644
index 0000000..b233dbd
--- /dev/null
+++ b/t/t4034/fortran/expect
@@ -0,0 +1,10 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 87f0d0b..d308da2 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,5 +1,5 @@<RESET>
+print *, "Hello World<RED>!<RESET><GREEN>?<RESET>"
+
+DO10I = 1,10<RESET>
+<RED>DO10I<RESET><GREEN>DO 10 I<RESET> = 1,10
+<RED>DO10I<RESET><GREEN>DO 1 0 I<RESET> = 1,10
diff --git a/t/t4034/fortran/post b/t/t4034/fortran/post
new file mode 100644
index 0000000..d308da2
--- /dev/null
+++ b/t/t4034/fortran/post
@@ -0,0 +1,5 @@
+print *, "Hello World?"
+
+DO10I = 1,10
+DO 10 I = 1,10
+DO 1 0 I = 1,10
diff --git a/t/t4034/fortran/pre b/t/t4034/fortran/pre
new file mode 100644
index 0000000..87f0d0b
--- /dev/null
+++ b/t/t4034/fortran/pre
@@ -0,0 +1,5 @@
+print *, "Hello World!"
+
+DO10I = 1,10
+DO10I = 1,10
+DO10I = 1,10
diff --git a/t/t4034/html/expect b/t/t4034/html/expect
new file mode 100644
index 0000000..447b49a
--- /dev/null
+++ b/t/t4034/html/expect
@@ -0,0 +1,8 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 8ca4aea..46921e5 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,3 +1,3 @@<RESET>
+<tag <GREEN>newattr="newvalue"<RESET>><GREEN>added<RESET> content</tag>
+<tag attr=<RED>"value"<RESET><GREEN>"newvalue"<RESET>><RED>content<RESET><GREEN>changed<RESET></tag>
+<<RED>tag<RESET><GREEN>newtag<RESET>>content <RED>&entity;<RESET><GREEN>&newentity;<RESET><<RED>/tag<RESET><GREEN>/newtag<RESET>>
diff --git a/t/t4034/html/post b/t/t4034/html/post
new file mode 100644
index 0000000..46921e5
--- /dev/null
+++ b/t/t4034/html/post
@@ -0,0 +1,3 @@
+<tag newattr="newvalue">added content</tag>
+<tag attr="newvalue">changed</tag>
+<newtag>content &newentity;</newtag>
diff --git a/t/t4034/html/pre b/t/t4034/html/pre
new file mode 100644
index 0000000..8ca4aea
--- /dev/null
+++ b/t/t4034/html/pre
@@ -0,0 +1,3 @@
+<tag>content</tag>
+<tag attr="value">content</tag>
+<tag>content &entity;</tag>
diff --git a/t/t4034/java/expect b/t/t4034/java/expect
new file mode 100644
index 0000000..37d1ea2
--- /dev/null
+++ b/t/t4034/java/expect
@@ -0,0 +1,36 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 23d5c8a..7e8c026 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,19 +1,19 @@<RESET>
+Foo() : x(0<RED>&&1<RESET><GREEN>&42<RESET>) { <GREEN>bar(x);<RESET> }
+cout<<"Hello World<RED>!<RESET><GREEN>?<RESET>\n"<<endl;
+<GREEN>(<RESET>1<GREEN>) (<RESET>-1e10<GREEN>) (<RESET>0xabcdef<GREEN>)<RESET> '<RED>x<RESET><GREEN>y<RESET>'
+[<RED>a<RESET><GREEN>x<RESET>] <RED>a<RESET><GREEN>x<RESET>-><RED>b a<RESET><GREEN>y x<RESET>.<RED>b<RESET><GREEN>y<RESET>
+!<RED>a<RESET><GREEN>x<RESET> ~<RED>a a<RESET><GREEN>x x<RESET>++ <RED>a<RESET><GREEN>x<RESET>-- <RED>a<RESET><GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>/<RED>b a<RESET><GREEN>y x<RESET>%<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>+<RED>b a<RESET><GREEN>y x<RESET>-<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<<RED>b a<RESET><GREEN>y x<RESET>>><RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<RED>b a<RESET><GREEN>y x<RESET><=<RED>b a<RESET><GREEN>y x<RESET>><RED>b a<RESET><GREEN>y x<RESET>>=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>==<RED>b a<RESET><GREEN>y x<RESET>!=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>^<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>|<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>||<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>?<RED>b<RESET><GREEN>y<RESET>:z
+<RED>a<RESET><GREEN>x<RESET>=<RED>b a<RESET><GREEN>y x<RESET>+=<RED>b a<RESET><GREEN>y x<RESET>-=<RED>b a<RESET><GREEN>y x<RESET>*=<RED>b a<RESET><GREEN>y x<RESET>/=<RED>b a<RESET><GREEN>y x<RESET>%=<RED>b a<RESET><GREEN>y x<RESET><<=<RED>b a<RESET><GREEN>y x<RESET>>>=<RED>b a<RESET><GREEN>y x<RESET>&=<RED>b a<RESET><GREEN>y x<RESET>^=<RED>b a<RESET><GREEN>y x<RESET>|=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>,y
+<RED>a<RESET><GREEN>x<RESET>::<RED>b<RESET><GREEN>y<RESET>
diff --git a/t/t4034/java/post b/t/t4034/java/post
new file mode 100644
index 0000000..7e8c026
--- /dev/null
+++ b/t/t4034/java/post
@@ -0,0 +1,19 @@
+Foo() : x(0&42) { bar(x); }
+cout<<"Hello World?\n"<<endl;
+(1) (-1e10) (0xabcdef) 'y'
+[x] x->y x.y
+!x ~x x++ x-- x*y x&y
+x*y x/y x%y
+x+y x-y
+x<<y x>>y
+x<y x<=y x>y x>=y
+x==y x!=y
+x&y
+x^y
+x|y
+x&&y
+x||y
+x?y:z
+x=y x+=y x-=y x*=y x/=y x%=y x<<=y x>>=y x&=y x^=y x|=y
+x,y
+x::y
diff --git a/t/t4034/java/pre b/t/t4034/java/pre
new file mode 100644
index 0000000..23d5c8a
--- /dev/null
+++ b/t/t4034/java/pre
@@ -0,0 +1,19 @@
+Foo():x(0&&1){}
+cout<<"Hello World!\n"<<endl;
+1 -1e10 0xabcdef 'x'
+[a] a->b a.b
+!a ~a a++ a-- a*b a&b
+a*b a/b a%b
+a+b a-b
+a<<b a>>b
+a<b a<=b a>b a>=b
+a==b a!=b
+a&b
+a^b
+a|b
+a&&b
+a||b
+a?b:z
+a=b a+=b a-=b a*=b a/=b a%=b a<<=b a>>=b a&=b a^=b a|=b
+a,y
+a::b
diff --git a/t/t4034/objc/expect b/t/t4034/objc/expect
new file mode 100644
index 0000000..e5d1dd2
--- /dev/null
+++ b/t/t4034/objc/expect
@@ -0,0 +1,35 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 9106d63..dd5f421 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,18 +1,18 @@<RESET>
+Foo() : x(0<RED>&&1<RESET><GREEN>&42<RESET>) { <GREEN>bar(x);<RESET> }
+cout<<"Hello World<RED>!<RESET><GREEN>?<RESET>\n"<<endl;
+<GREEN>(<RESET>1<GREEN>) (<RESET>-1e10<GREEN>) (<RESET>0xabcdef<GREEN>)<RESET> '<RED>x<RESET><GREEN>y<RESET>'
+[<RED>a<RESET><GREEN>x<RESET>] <RED>a<RESET><GREEN>x<RESET>-><RED>b a<RESET><GREEN>y x<RESET>.<RED>b<RESET><GREEN>y<RESET>
+!<RED>a<RESET><GREEN>x<RESET> ~<RED>a a<RESET><GREEN>x x<RESET>++ <RED>a<RESET><GREEN>x<RESET>-- <RED>a<RESET><GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>/<RED>b a<RESET><GREEN>y x<RESET>%<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>+<RED>b a<RESET><GREEN>y x<RESET>-<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<<RED>b a<RESET><GREEN>y x<RESET>>><RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<RED>b a<RESET><GREEN>y x<RESET><=<RED>b a<RESET><GREEN>y x<RESET>><RED>b a<RESET><GREEN>y x<RESET>>=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>==<RED>b a<RESET><GREEN>y x<RESET>!=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>^<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>|<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>||<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>?<RED>b<RESET><GREEN>y<RESET>:z
+<RED>a<RESET><GREEN>x<RESET>=<RED>b a<RESET><GREEN>y x<RESET>+=<RED>b a<RESET><GREEN>y x<RESET>-=<RED>b a<RESET><GREEN>y x<RESET>*=<RED>b a<RESET><GREEN>y x<RESET>/=<RED>b a<RESET><GREEN>y x<RESET>%=<RED>b a<RESET><GREEN>y x<RESET><<=<RED>b a<RESET><GREEN>y x<RESET>>>=<RED>b a<RESET><GREEN>y x<RESET>&=<RED>b a<RESET><GREEN>y x<RESET>^=<RED>b a<RESET><GREEN>y x<RESET>|=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>,y
diff --git a/t/t4034/objc/post b/t/t4034/objc/post
new file mode 100644
index 0000000..dd5f421
--- /dev/null
+++ b/t/t4034/objc/post
@@ -0,0 +1,18 @@
+Foo() : x(0&42) { bar(x); }
+cout<<"Hello World?\n"<<endl;
+(1) (-1e10) (0xabcdef) 'y'
+[x] x->y x.y
+!x ~x x++ x-- x*y x&y
+x*y x/y x%y
+x+y x-y
+x<<y x>>y
+x<y x<=y x>y x>=y
+x==y x!=y
+x&y
+x^y
+x|y
+x&&y
+x||y
+x?y:z
+x=y x+=y x-=y x*=y x/=y x%=y x<<=y x>>=y x&=y x^=y x|=y
+x,y
diff --git a/t/t4034/objc/pre b/t/t4034/objc/pre
new file mode 100644
index 0000000..9106d63
--- /dev/null
+++ b/t/t4034/objc/pre
@@ -0,0 +1,18 @@
+Foo():x(0&&1){}
+cout<<"Hello World!\n"<<endl;
+1 -1e10 0xabcdef 'x'
+[a] a->b a.b
+!a ~a a++ a-- a*b a&b
+a*b a/b a%b
+a+b a-b
+a<<b a>>b
+a<b a<=b a>b a>=b
+a==b a!=b
+a&b
+a^b
+a|b
+a&&b
+a||b
+a?b:z
+a=b a+=b a-=b a*=b a/=b a%=b a<<=b a>>=b a&=b a^=b a|=b
+a,y
diff --git a/t/t4034/pascal/expect b/t/t4034/pascal/expect
new file mode 100644
index 0000000..2ce4230
--- /dev/null
+++ b/t/t4034/pascal/expect
@@ -0,0 +1,35 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 077046c..8865e6b 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,18 +1,18 @@<RESET>
+writeln("Hello World<RED>!<RESET><GREEN>?<RESET>");
+<GREEN>(<RESET>1<GREEN>) (<RESET>-1e10<GREEN>) (<RESET>0xabcdef<GREEN>)<RESET> '<RED>x<RESET><GREEN>y<RESET>'
+[<RED>a<RESET><GREEN>x<RESET>] <RED>a<RESET><GREEN>x<RESET>-><RED>b a<RESET><GREEN>y x<RESET>.<RED>b<RESET><GREEN>y<RESET>
+!<RED>a<RESET><GREEN>x<RESET> ~<RED>a a<RESET><GREEN>x x<RESET>++ <RED>a<RESET><GREEN>x<RESET>-- <RED>a<RESET><GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>/<RED>b a<RESET><GREEN>y x<RESET>%<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>+<RED>b a<RESET><GREEN>y x<RESET>-<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<<RED>b a<RESET><GREEN>y x<RESET>>><RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<RED>b a<RESET><GREEN>y x<RESET><=<RED>b a<RESET><GREEN>y x<RESET>><RED>b a<RESET><GREEN>y x<RESET>>=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>==<RED>b a<RESET><GREEN>y x<RESET>!=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>^<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>|<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>||<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>?<RED>b<RESET><GREEN>y<RESET>:z
+<RED>a<RESET><GREEN>x<RESET>=<RED>b a<RESET><GREEN>y x<RESET>+=<RED>b a<RESET><GREEN>y x<RESET>-=<RED>b a<RESET><GREEN>y x<RESET>*=<RED>b a<RESET><GREEN>y x<RESET>/=<RED>b a<RESET><GREEN>y x<RESET>%=<RED>b a<RESET><GREEN>y x<RESET><<=<RED>b a<RESET><GREEN>y x<RESET>>>=<RED>b a<RESET><GREEN>y x<RESET>&=<RED>b a<RESET><GREEN>y x<RESET>^=<RED>b a<RESET><GREEN>y x<RESET>|=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>,y
+<RED>a<RESET><GREEN>x<RESET>::<RED>b<RESET><GREEN>y<RESET>
diff --git a/t/t4034/pascal/post b/t/t4034/pascal/post
new file mode 100644
index 0000000..8865e6b
--- /dev/null
+++ b/t/t4034/pascal/post
@@ -0,0 +1,18 @@
+writeln("Hello World?");
+(1) (-1e10) (0xabcdef) 'y'
+[x] x->y x.y
+!x ~x x++ x-- x*y x&y
+x*y x/y x%y
+x+y x-y
+x<<y x>>y
+x<y x<=y x>y x>=y
+x==y x!=y
+x&y
+x^y
+x|y
+x&&y
+x||y
+x?y:z
+x=y x+=y x-=y x*=y x/=y x%=y x<<=y x>>=y x&=y x^=y x|=y
+x,y
+x::y
diff --git a/t/t4034/pascal/pre b/t/t4034/pascal/pre
new file mode 100644
index 0000000..077046c
--- /dev/null
+++ b/t/t4034/pascal/pre
@@ -0,0 +1,18 @@
+writeln("Hello World!");
+1 -1e10 0xabcdef 'x'
+[a] a->b a.b
+!a ~a a++ a-- a*b a&b
+a*b a/b a%b
+a+b a-b
+a<<b a>>b
+a<b a<=b a>b a>=b
+a==b a!=b
+a&b
+a^b
+a|b
+a&&b
+a||b
+a?b:z
+a=b a+=b a-=b a*=b a/=b a%=b a<<=b a>>=b a&=b a^=b a|=b
+a,y
+a::b
diff --git a/t/t4034/php/expect b/t/t4034/php/expect
new file mode 100644
index 0000000..0404408
--- /dev/null
+++ b/t/t4034/php/expect
@@ -0,0 +1,35 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index cf6e06b..4420a49 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,18 +1,18 @@<RESET>
+<GREEN>(<RESET>$var<GREEN>)<RESET> $ var
+<?="Hello World<RED>!<RESET><GREEN>?<RESET>"?>
+<GREEN>(<RESET>1<GREEN>) (<RESET>-1e10<GREEN>) (<RESET>0xabcdef<GREEN>)<RESET> '<RED>x<RESET><GREEN>y<RESET>'
+[<RED>a<RESET><GREEN>x<RESET>] <RED>a<RESET><GREEN>x<RESET>-><RED>b a<RESET><GREEN>y x<RESET>.<RED>b<RESET><GREEN>y<RESET>
+!<RED>a<RESET><GREEN>x<RESET> ~<RED>a a<RESET><GREEN>x x<RESET>++ <RED>a<RESET><GREEN>x<RESET>-- <RED>a<RESET><GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>/<RED>b a<RESET><GREEN>y x<RESET>%<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>+<RED>b a<RESET><GREEN>y x<RESET>-<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<<RED>b a<RESET><GREEN>y x<RESET>>><RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<RED>b a<RESET><GREEN>y x<RESET><=<RED>b a<RESET><GREEN>y x<RESET>><RED>b a<RESET><GREEN>y x<RESET>>=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>==<RED>b a<RESET><GREEN>y x<RESET>!=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>^<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>|<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>||<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>?<RED>b<RESET><GREEN>y<RESET>:z
+<RED>a<RESET><GREEN>x<RESET>=<RED>b a<RESET><GREEN>y x<RESET>+=<RED>b a<RESET><GREEN>y x<RESET>-=<RED>b a<RESET><GREEN>y x<RESET>*=<RED>b a<RESET><GREEN>y x<RESET>/=<RED>b a<RESET><GREEN>y x<RESET>%=<RED>b a<RESET><GREEN>y x<RESET><<=<RED>b a<RESET><GREEN>y x<RESET>>>=<RED>b a<RESET><GREEN>y x<RESET>&=<RED>b a<RESET><GREEN>y x<RESET>^=<RED>b a<RESET><GREEN>y x<RESET>|=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>,y
diff --git a/t/t4034/php/post b/t/t4034/php/post
new file mode 100644
index 0000000..4420a49
--- /dev/null
+++ b/t/t4034/php/post
@@ -0,0 +1,18 @@
+($var) $ var
+<?="Hello World?"?>
+(1) (-1e10) (0xabcdef) 'y'
+[x] x->y x.y
+!x ~x x++ x-- x*y x&y
+x*y x/y x%y
+x+y x-y
+x<<y x>>y
+x<y x<=y x>y x>=y
+x==y x!=y
+x&y
+x^y
+x|y
+x&&y
+x||y
+x?y:z
+x=y x+=y x-=y x*=y x/=y x%=y x<<=y x>>=y x&=y x^=y x|=y
+x,y
diff --git a/t/t4034/php/pre b/t/t4034/php/pre
new file mode 100644
index 0000000..cf6e06b
--- /dev/null
+++ b/t/t4034/php/pre
@@ -0,0 +1,18 @@
+$var $var
+<?= "Hello World!" ?>
+1 -1e10 0xabcdef 'x'
+[a] a->b a.b
+!a ~a a++ a-- a*b a&b
+a*b a/b a%b
+a+b a-b
+a<<b a>>b
+a<b a<=b a>b a>=b
+a==b a!=b
+a&b
+a^b
+a|b
+a&&b
+a||b
+a?b:z
+a=b a+=b a-=b a*=b a/=b a%=b a<<=b a>>=b a&=b a^=b a|=b
+a,y
diff --git a/t/t4034/python/expect b/t/t4034/python/expect
new file mode 100644
index 0000000..8abb8a4
--- /dev/null
+++ b/t/t4034/python/expect
@@ -0,0 +1,34 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 438f776..68baf34 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,17 +1,17 @@<RESET>
+print<RED>u<RESET> "Hello World<RED>!<RESET><GREEN>?<RESET>\n"<GREEN>; print<RESET>
+<GREEN>(<RESET>1<GREEN>) (<RESET>-1e10<GREEN>) (<RESET>0xabcdef<GREEN>) u<RESET>'<RED>x<RESET><GREEN>y<RESET>'
+[<RED>a<RESET><GREEN>x<RESET>] <RED>a<RESET><GREEN>x<RESET>-><RED>b a<RESET><GREEN>y x<RESET>.<RED>b<RESET><GREEN>y<RESET>
+!<RED>a<RESET><GREEN>x<RESET> ~<RED>a a<RESET><GREEN>x x<RESET>++ <RED>a<RESET><GREEN>x<RESET>-- <RED>a<RESET><GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>/<RED>b a<RESET><GREEN>y x<RESET>%<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>+<RED>b a<RESET><GREEN>y x<RESET>-<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<<RED>b a<RESET><GREEN>y x<RESET>>><RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<RED>b a<RESET><GREEN>y x<RESET><=<RED>b a<RESET><GREEN>y x<RESET>><RED>b a<RESET><GREEN>y x<RESET>>=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>==<RED>b a<RESET><GREEN>y x<RESET>!=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>^<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>|<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>||<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>?<RED>b<RESET><GREEN>y<RESET>:z
+<RED>a<RESET><GREEN>x<RESET>=<RED>b a<RESET><GREEN>y x<RESET>+=<RED>b a<RESET><GREEN>y x<RESET>-=<RED>b a<RESET><GREEN>y x<RESET>*=<RED>b a<RESET><GREEN>y x<RESET>/=<RED>b a<RESET><GREEN>y x<RESET>%=<RED>b a<RESET><GREEN>y x<RESET><<=<RED>b a<RESET><GREEN>y x<RESET>>>=<RED>b a<RESET><GREEN>y x<RESET>&=<RED>b a<RESET><GREEN>y x<RESET>^=<RED>b a<RESET><GREEN>y x<RESET>|=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>,y
diff --git a/t/t4034/python/post b/t/t4034/python/post
new file mode 100644
index 0000000..68baf34
--- /dev/null
+++ b/t/t4034/python/post
@@ -0,0 +1,17 @@
+print "Hello World?\n"; print
+(1) (-1e10) (0xabcdef) u'y'
+[x] x->y x.y
+!x ~x x++ x-- x*y x&y
+x*y x/y x%y
+x+y x-y
+x<<y x>>y
+x<y x<=y x>y x>=y
+x==y x!=y
+x&y
+x^y
+x|y
+x&&y
+x||y
+x?y:z
+x=y x+=y x-=y x*=y x/=y x%=y x<<=y x>>=y x&=y x^=y x|=y
+x,y
diff --git a/t/t4034/python/pre b/t/t4034/python/pre
new file mode 100644
index 0000000..438f776
--- /dev/null
+++ b/t/t4034/python/pre
@@ -0,0 +1,17 @@
+print u"Hello World!\n"
+1 -1e10 0xabcdef 'x'
+[a] a->b a.b
+!a ~a a++ a-- a*b a&b
+a*b a/b a%b
+a+b a-b
+a<<b a>>b
+a<b a<=b a>b a>=b
+a==b a!=b
+a&b
+a^b
+a|b
+a&&b
+a||b
+a?b:z
+a=b a+=b a-=b a*=b a/=b a%=b a<<=b a>>=b a&=b a^=b a|=b
+a,y
diff --git a/t/t4034/ruby/expect b/t/t4034/ruby/expect
new file mode 100644
index 0000000..16e1dd5
--- /dev/null
+++ b/t/t4034/ruby/expect
@@ -0,0 +1,34 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 30ed9a1..7678f14 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,17 +1,17 @@<RESET>
+10.downto(1) {|<RED>x<RESET><GREEN>y<RESET>| puts <RED>x<RESET><GREEN>y<RESET>}
+<GREEN>(<RESET>1<GREEN>) (<RESET>-1e10<GREEN>) (<RESET>0xabcdef<GREEN>)<RESET> '<RED>x<RESET><GREEN>y<RESET>'
+[<RED>a<RESET><GREEN>x<RESET>] <RED>a<RESET><GREEN>x<RESET>-><RED>b a<RESET><GREEN>y x<RESET>.<RED>b<RESET><GREEN>y<RESET>
+!<RED>a<RESET><GREEN>x<RESET> ~<RED>a a<RESET><GREEN>x x<RESET>++ <RED>a<RESET><GREEN>x<RESET>-- <RED>a<RESET><GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>/<RED>b a<RESET><GREEN>y x<RESET>%<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>+<RED>b a<RESET><GREEN>y x<RESET>-<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<<RED>b a<RESET><GREEN>y x<RESET>>><RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET><<RED>b a<RESET><GREEN>y x<RESET><=<RED>b a<RESET><GREEN>y x<RESET>><RED>b a<RESET><GREEN>y x<RESET>>=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>==<RED>b a<RESET><GREEN>y x<RESET>!=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>^<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>|<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>||<RED>b<RESET>
+<RED>a?b<RESET><GREEN>y<RESET>
+<GREEN>x?y<RESET>:z
+<RED>a<RESET><GREEN>x<RESET>=<RED>b a<RESET><GREEN>y x<RESET>+=<RED>b a<RESET><GREEN>y x<RESET>-=<RED>b a<RESET><GREEN>y x<RESET>*=<RED>b a<RESET><GREEN>y x<RESET>/=<RED>b a<RESET><GREEN>y x<RESET>%=<RED>b a<RESET><GREEN>y x<RESET><<=<RED>b a<RESET><GREEN>y x<RESET>>>=<RED>b a<RESET><GREEN>y x<RESET>&=<RED>b a<RESET><GREEN>y x<RESET>^=<RED>b a<RESET><GREEN>y x<RESET>|=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>,y
diff --git a/t/t4034/ruby/post b/t/t4034/ruby/post
new file mode 100644
index 0000000..7678f14
--- /dev/null
+++ b/t/t4034/ruby/post
@@ -0,0 +1,17 @@
+10.downto(1) {|y| puts y}
+(1) (-1e10) (0xabcdef) 'y'
+[x] x->y x.y
+!x ~x x++ x-- x*y x&y
+x*y x/y x%y
+x+y x-y
+x<<y x>>y
+x<y x<=y x>y x>=y
+x==y x!=y
+x&y
+x^y
+x|y
+x&&y
+x||y
+x?y:z
+x=y x+=y x-=y x*=y x/=y x%=y x<<=y x>>=y x&=y x^=y x|=y
+x,y
diff --git a/t/t4034/ruby/pre b/t/t4034/ruby/pre
new file mode 100644
index 0000000..30ed9a1
--- /dev/null
+++ b/t/t4034/ruby/pre
@@ -0,0 +1,17 @@
+10.downto(1) {|x| puts x}
+1 -1e10 0xabcdef 'x'
+[a] a->b a.b
+!a ~a a++ a-- a*b a&b
+a*b a/b a%b
+a+b a-b
+a<<b a>>b
+a<b a<=b a>b a>=b
+a==b a!=b
+a&b
+a^b
+a|b
+a&&b
+a||b
+a?b:z
+a=b a+=b a-=b a*=b a/=b a%=b a<<=b a>>=b a&=b a^=b a|=b
+a,y
diff --git a/t/t4034/tex/expect b/t/t4034/tex/expect
new file mode 100644
index 0000000..604969b
--- /dev/null
+++ b/t/t4034/tex/expect
@@ -0,0 +1,9 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 2b2dfcb..65cab61 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,4 +1,4 @@<RESET>
+\section{Something <GREEN>new<RESET>}
+<RED>\emph<RESET><GREEN>\textbf<RESET>{Macro style}
+{<RED>\em<RESET><GREEN>\bfseries<RESET> State toggle style}
+\\[<RED>1em<RESET><GREEN>1cm<RESET>]
diff --git a/t/t4034/tex/post b/t/t4034/tex/post
new file mode 100644
index 0000000..65cab61
--- /dev/null
+++ b/t/t4034/tex/post
@@ -0,0 +1,4 @@
+\section{Something new}
+\textbf{Macro style}
+{\bfseries State toggle style}
+\\[1cm]
diff --git a/t/t4034/tex/pre b/t/t4034/tex/pre
new file mode 100644
index 0000000..2b2dfcb
--- /dev/null
+++ b/t/t4034/tex/pre
@@ -0,0 +1,4 @@
+\section{Something}
+\emph{Macro style}
+{\em State toggle style}
+\\[1em]

-- 
1.7.4.rc1

Junio C Hamano· Jan 18, 2011, 18:00 UTC · re: Jonathan Nieder · lore

Re*: [PATCH 1/3] t4034: bulk verify builtin word regex sanity

Jonathan Nieder <jrnieder@gmail.com> writes:

Show 5 quoted lines

> From: Thomas Rast <trast@student.ethz.ch>
> Date: Sat, 18 Dec 2010 17:17:54 +0100
>
> The builtin word regexes should be tested with some simple examples
> against simple issues.  Do this in bulk.

Thanks.

Show 8 quoted lines

> diff --git a/t/t4034/bibtex/expect b/t/t4034/bibtex/expect
> new file mode 100644
> index 0000000..a157774
> --- /dev/null
> +++ b/t/t4034/bibtex/expect
> @@ -0,0 +1,15 @@
> +<BOLD>diff --git a/pre b/post<RESET>
> +<BOLD>index 95cd55b..ddcba9b 100644<RESET>

Having to change this line every time the test input (or output) has changed is somewhat unfortunate.

Also I noticed that "word_diff" shell function has this:

       test_must_fail git diff --no-index "$@" pre post >output &&

which solicits two comments:

 - We do not seem to document that --no-index implies --exit-code, ever
   since the latter option was introduced at 41bbf9d (Allow git-diff exit
   with codes similar to diff(1), 2007-03-14).  Probably we should.

 - This assumes that no test vector would have identical pre/post pair
   that expects no output, which feels somewhat limiting.

What we care about in this test is that "git diff --no-index" does not die an uncontrolled death, so test_might_fail may be more appropriate.

Here is another that probably should be squashed to this patch together with 3/3 to add tests for the perl driver (I noticed it only because 2/3 had trivial conflict due to recent addition of it).

-- >8 --
From: Junio C Hamano <gitster@pobox.com>
Date: Tue, 18 Jan 2011 09:43:43 -0800
Subject: [PATCH] t4034 (diff --word-diff): add a minimum Perl drier test vector

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 t/t4034-diff-words.sh |    1 +
 t/t4034/perl/expect   |   13 +++++++++++++
 t/t4034/perl/post     |   22 ++++++++++++++++++++++
 t/t4034/perl/pre      |   22 ++++++++++++++++++++++
 4 files changed, 58 insertions(+), 0 deletions(-)
 create mode 100644 t/t4034/perl/expect
 create mode 100644 t/t4034/perl/post
 create mode 100644 t/t4034/perl/pre

Show changes to 4 files +58 −0

t/t4034-diff-words.sh, t/t4034/perl/expect, t/t4034/perl/post, t/t4034/perl/pre

diff --git a/t/t4034-diff-words.sh b/t/t4034-diff-words.sh
index c3b1c48..37aeab0 100755
--- a/t/t4034-diff-words.sh
+++ b/t/t4034-diff-words.sh
@@ -301,6 +301,7 @@ test_language_driver html
 test_language_driver java
 test_language_driver objc
 test_language_driver pascal
+test_language_driver perl
 test_language_driver php
 test_language_driver python
 test_language_driver ruby
diff --git a/t/t4034/perl/expect b/t/t4034/perl/expect
new file mode 100644
index 0000000..a1deb6b
--- /dev/null
+++ b/t/t4034/perl/expect
@@ -0,0 +1,13 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index f6610d3..e8b72ef 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -4,8 +4,8 @@<RESET>
+
+package Frotz;<RESET>
+sub new {<RESET>
+	my <GREEN>(<RESET>$class<GREEN>, %opts)<RESET> = <RED>shift<RESET><GREEN>@_<RESET>;
+	return bless { <GREEN>xyzzy => "nitfol", %opts<RESET> }, $class;
+}<RESET>
+
+__END__<RESET>
diff --git a/t/t4034/perl/post b/t/t4034/perl/post
new file mode 100644
index 0000000..e8b72ef
--- /dev/null
+++ b/t/t4034/perl/post
@@ -0,0 +1,22 @@
+#!/usr/bin/perl
+
+use strict;
+
+package Frotz;
+sub new {
+	my ($class, %opts) = @_;
+	return bless { xyzzy => "nitfol", %opts }, $class;
+}
+
+__END__
+=head1 NAME
+
+frotz - Frotz
+
+=head1 SYNOPSIS
+
+  use frotz;
+
+  $nitfol = new Frotz();
+
+=cut
diff --git a/t/t4034/perl/pre b/t/t4034/perl/pre
new file mode 100644
index 0000000..f6610d3
--- /dev/null
+++ b/t/t4034/perl/pre
@@ -0,0 +1,22 @@
+#!/usr/bin/perl
+
+use strict;
+
+package Frotz;
+sub new {
+	my $class = shift;
+	return bless {}, $class;
+}
+
+__END__
+=head1 NAME
+
+frotz - Frotz
+
+=head1 SYNOPSIS
+
+  use frotz;
+
+  $nitfol = new Frotz();
+
+=cut

-- 
1.7.4.rc2.226.g63d9a

Jonathan Nieder· Jan 11, 2011, 21:48 UTC · re: Jonathan Nieder · lore

[PATCH 2/3] userdiff: simplify word-diff safeguard

git's diff-words support has a detail that can be a little dangerous: any text not matched by a given language's tokenization pattern is treated as whitespace and changes in such text would go unnoticed. Therefore each of the built-in regexes allows a special token type consisting of a single non-whitespace character [^[:space:]].

To make sure UTF-8 sequences remain human readable, the builtin regexes also have a special token type for runs of bytes with the high bit set. In English, non-ASCII characters are usually isolated so this is analogous to the [^[:space:]] pattern, except it matches a single _multibyte_ character despite use of the C locale.

Unfortunately it is easy to make typos or forget entirely to include these catch-all token types when adding support for new languages (see v1.7.3.5~16, userdiff: fix typo in ruby and python word regexes, 2010-12-18). Avoid this by including them automatically within the PATTERNS and IPATTERN macros.

While at it, change the UTF-8 sequence token type to match exactly one non-ASCII multi-byte character, rather than an arbitrary run of them.

Suggested-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
---
 userdiff.c |   37 +++++++++++++++----------------------
 1 files changed, 15 insertions(+), 22 deletions(-)

Show changes to userdiff.c +15 −22

diff --git a/userdiff.c b/userdiff.c
index 2d54536..91586cf 100644
--- a/userdiff.c
+++ b/userdiff.c
@@ -8,9 +8,11 @@ static int ndrivers;
 static int drivers_alloc;
 
 #define PATTERNS(name, pattern, word_regex)			\
-	{ name, NULL, -1, { pattern, REG_EXTENDED }, word_regex }
+	{ name, NULL, -1, { pattern, REG_EXTENDED },		\
+	  word_regex "|[^[:space:]]|[\xc0-\xff][\x80-\xbf]+" }
 #define IPATTERN(name, pattern, word_regex)			\
-	{ name, NULL, -1, { pattern, REG_EXTENDED | REG_ICASE }, word_regex }
+	{ name, NULL, -1, { pattern, REG_EXTENDED | REG_ICASE }, \
+	  word_regex "|[^[:space:]]|[\xc0-\xff][\x80-\xbf]+" }
 static struct userdiff_driver builtin_drivers[] = {
 IPATTERN("fortran",
 	 "!^([C*]|[ \t]*!)\n"
@@ -24,10 +26,9 @@ IPATTERN("fortran",
 	  * Don't worry about format statements without leading digits since
 	  * they would have been matched above as a variable anyway. */
 	 "|[-+]?[0-9.]+([AaIiDdEeFfLlTtXx][Ss]?[-+]?[0-9.]*)?(_[a-zA-Z0-9][a-zA-Z0-9_]*)?"
-	 "|//|\\*\\*|::|[/<>=]="
-	 "|[^[:space:]]|[\x80-\xff]+"),
+	 "|//|\\*\\*|::|[/<>=]="),
 PATTERNS("html", "^[ \t]*(<[Hh][1-6][ \t].*>.*)$",
-	 "[^<>= \t]+|[^[:space:]]|[\x80-\xff]+"),
+	 "[^<>= \t]+"),
 PATTERNS("java",
 	 "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
 	 "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$",
@@ -35,8 +36,7 @@ PATTERNS("java",
 	 "[a-zA-Z_][a-zA-Z0-9_]*"
 	 "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
 	 "|[-+*/<>%&^|=!]="
-	 "|--|\\+\\+|<<=?|>>>?=?|&&|\\|\\|"
-	 "|[^[:space:]]|[\x80-\xff]+"),
+	 "|--|\\+\\+|<<=?|>>>?=?|&&|\\|\\|"),
 PATTERNS("objc",
 	 /* Negate C statements that can look like functions */
 	 "!^[ \t]*(do|for|if|else|return|switch|while)\n"
@@ -49,8 +49,7 @@ PATTERNS("objc",
 	 /* -- */
 	 "[a-zA-Z_][a-zA-Z0-9_]*"
 	 "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
-	 "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"
-	 "|[^[:space:]]|[\x80-\xff]+"),
+	 "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
 PATTERNS("pascal",
 	 "^((procedure|function|constructor|destructor|interface|"
 		"implementation|initialization|finalization)[ \t]*.*)$"
@@ -59,33 +58,29 @@ PATTERNS("pascal",
 	 /* -- */
 	 "[a-zA-Z_][a-zA-Z0-9_]*"
 	 "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
-	 "|<>|<=|>=|:=|\\.\\."
-	 "|[^[:space:]]|[\x80-\xff]+"),
+	 "|<>|<=|>=|:=|\\.\\."),
 PATTERNS("php",
 	 "^[\t ]*(((public|protected|private|static)[\t ]+)*function.*)$\n"
 	 "^[\t ]*(class.*)$",
 	 /* -- */
 	 "[a-zA-Z_][a-zA-Z0-9_]*"
 	 "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
-	 "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"
-	 "|[^[:space:]]|[\x80-\xff]+"),
+	 "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"),
 PATTERNS("python", "^[ \t]*((class|def)[ \t].*)$",
 	 /* -- */
 	 "[a-zA-Z_][a-zA-Z0-9_]*"
 	 "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
-	 "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"
-	 "|[^[:space:]]|[\x80-\xff]+"),
+	 "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"),
 	 /* -- */
 PATTERNS("ruby", "^[ \t]*((class|module|def)[ \t].*)$",
 	 /* -- */
 	 "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
 	 "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
-	 "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"
-	 "|[^[:space:]]|[\x80-\xff]+"),
+	 "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"),
 PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
 	 "[={}\"]|[^={}\" \t]+"),
 PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
-	 "\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+|[^[:space:]]"),
+	 "\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+"),
 PATTERNS("cpp",
 	 /* Jump targets or access declarations */
 	 "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:.*$\n"
@@ -96,8 +91,7 @@ PATTERNS("cpp",
 	 /* -- */
 	 "[a-zA-Z_][a-zA-Z0-9_]*"
 	 "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
-	 "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"
-	 "|[^[:space:]]|[\x80-\xff]+"),
+	 "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
 PATTERNS("csharp",
 	 /* Keywords */
 	 "!^[ \t]*(do|while|for|if|else|instanceof|new|return|switch|case|throw|catch|using)\n"
@@ -112,8 +106,7 @@ PATTERNS("csharp",
 	 /* -- */
 	 "[a-zA-Z_][a-zA-Z0-9_]*"
 	 "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
-	 "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"
-	 "|[^[:space:]]|[\x80-\xff]+"),
+	 "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
 { "default", NULL, -1, { NULL, 0 } },
 };
 #undef PATTERNS

-- 
1.7.4.rc1

Jonathan Nieder· Jan 11, 2011, 21:49 UTC · re: Jonathan Nieder · lore

[PATCH 3/3] t4034 (diff --word-diff): style suggestions

Rearrange code to be easier to browse:

 - first data
 - then functions
 - then test assertions

Mark up inline test vectors as

  cat >vector <<-\EOF
	data
	data
  EOF

for visual scannability. Use words like "set up" for tests that set up for other tests, to make it obvious which tests are safe to skip. Use repeated function calls instead of a loop for the language-specific tests, so the invocations can be easily tweaked individually (for example if one starts to fail).

This means if you add a new subdirectory to t4034/, it will not be automatically used. I think that's worth it for the added explicitness.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
---
 t/t4034-diff-words.sh |  476 ++++++++++++++++++++++--------------------------
 1 files changed, 218 insertions(+), 258 deletions(-)

Show changes to t/t4034-diff-words.sh +218 −255

diff --git a/t/t4034-diff-words.sh b/t/t4034-diff-words.sh
index 2647191..c3b1c48 100755
--- a/t/t4034-diff-words.sh
+++ b/t/t4034-diff-words.sh
@@ -4,346 +4,306 @@ test_description='word diff colors'
 
 . ./test-lib.sh
 
+cat >pre.simple <<-\EOF
+	h(4)
+
+	a = b + c
+EOF
+cat >post.simple <<-\EOF
+	h(4),hh[44]
+
+	a = b + c
+
+	aa = a
+
+	aeff = aeff * ( aaa )
+EOF
+cat >expect.letter-runs-are-words <<-\EOF
+	<BOLD>diff --git a/pre b/post<RESET>
+	<BOLD>index 330b04f..5ed8eff 100644<RESET>
+	<BOLD>--- a/pre<RESET>
+	<BOLD>+++ b/post<RESET>
+	<CYAN>@@ -1,3 +1,7 @@<RESET>
+	h(4),<GREEN>hh<RESET>[44]
+
+	a = b + c<RESET>
+
+	<GREEN>aa = a<RESET>
+
+	<GREEN>aeff = aeff * ( aaa<RESET> )
+EOF
+cat >expect.non-whitespace-is-word <<-\EOF
+	<BOLD>diff --git a/pre b/post<RESET>
+	<BOLD>index 330b04f..5ed8eff 100644<RESET>
+	<BOLD>--- a/pre<RESET>
+	<BOLD>+++ b/post<RESET>
+	<CYAN>@@ -1,3 +1,7 @@<RESET>
+	h(4)<GREEN>,hh[44]<RESET>
+
+	a = b + c<RESET>
+
+	<GREEN>aa = a<RESET>
+
+	<GREEN>aeff = aeff * ( aaa )<RESET>
+EOF
+
+word_diff () {
+	test_must_fail git diff --no-index "$@" pre post >output &&
+	test_decode_color <output >output.decrypted &&
+	test_cmp expect output.decrypted
+}
+
+test_language_driver () {
+	lang=$1
+	test_expect_success "diff driver '$lang'" '
+		cp "$TEST_DIRECTORY/t4034/'"$lang"'/pre" \
+			"$TEST_DIRECTORY/t4034/'"$lang"'/post" \
+			"$TEST_DIRECTORY/t4034/'"$lang"'/expect" . &&
+		echo "* diff='"$lang"'" >.gitattributes &&
+		word_diff --color-words
+	'
+}
+
 test_expect_success setup '
-
 	git config diff.color.old red &&
 	git config diff.color.new green &&
 	git config diff.color.func magenta
-
 '
 
-word_diff () {
-	test_must_fail git diff --no-index "$@" pre post > output &&
-	test_decode_color <output >output.decrypted &&
-	test_cmp expect output.decrypted
-}
-
-cat > pre <<\EOF
-h(4)
-
-a = b + c
-EOF
-
-cat > post <<\EOF
-h(4),hh[44]
-
-a = b + c
-
-aa = a
-
-aeff = aeff * ( aaa )
-EOF
-
-cat > expect <<\EOF
-<BOLD>diff --git a/pre b/post<RESET>
-<BOLD>index 330b04f..5ed8eff 100644<RESET>
-<BOLD>--- a/pre<RESET>
-<BOLD>+++ b/post<RESET>
-<CYAN>@@ -1,3 +1,7 @@<RESET>
-<RED>h(4)<RESET><GREEN>h(4),hh[44]<RESET>
-
-a = b + c<RESET>
-
-<GREEN>aa = a<RESET>
-
-<GREEN>aeff = aeff * ( aaa )<RESET>
-EOF
+test_expect_success 'set up pre and post with runs of whitespace' '
+	cp pre.simple pre &&
+	cp post.simple post
+'
 
 test_expect_success 'word diff with runs of whitespace' '
+	cat >expect <<-\EOF &&
+		<BOLD>diff --git a/pre b/post<RESET>
+		<BOLD>index 330b04f..5ed8eff 100644<RESET>
+		<BOLD>--- a/pre<RESET>
+		<BOLD>+++ b/post<RESET>
+		<CYAN>@@ -1,3 +1,7 @@<RESET>
+		<RED>h(4)<RESET><GREEN>h(4),hh[44]<RESET>
 
-	word_diff --color-words
+		a = b + c<RESET>
 
-'
-
-test_expect_success '--word-diff=color' '
-
-	word_diff --word-diff=color
-
-'
-
-test_expect_success '--color --word-diff=color' '
+		<GREEN>aa = a<RESET>
 
+		<GREEN>aeff = aeff * ( aaa )<RESET>
+	EOF
+	word_diff --color-words &&
+	word_diff --word-diff=color &&
 	word_diff --color --word-diff=color
-
 '
 
-sed 's/#.*$//' > expect <<EOF
-diff --git a/pre b/post
-index 330b04f..5ed8eff 100644
---- a/pre
-+++ b/post
-@@ -1,3 +1,7 @@
--h(4)
-+h(4),hh[44]
-~
- # significant space
-~
- a = b + c
-~
-~
-+aa = a
-~
-~
-+aeff = aeff * ( aaa )
-~
-EOF
-
 test_expect_success '--word-diff=porcelain' '
-
+	sed 's/#.*$//' >expect <<-\EOF &&
+		diff --git a/pre b/post
+		index 330b04f..5ed8eff 100644
+		--- a/pre
+		+++ b/post
+		@@ -1,3 +1,7 @@
+		-h(4)
+		+h(4),hh[44]
+		~
+		 # significant space
+		~
+		 a = b + c
+		~
+		~
+		+aa = a
+		~
+		~
+		+aeff = aeff * ( aaa )
+		~
+	EOF
 	word_diff --word-diff=porcelain
-
 '
 
-cat > expect <<EOF
-diff --git a/pre b/post
-index 330b04f..5ed8eff 100644
---- a/pre
-+++ b/post
-@@ -1,3 +1,7 @@
-[-h(4)-]{+h(4),hh[44]+}
-
-a = b + c
-
-{+aa = a+}
-
-{+aeff = aeff * ( aaa )+}
-EOF
-
 test_expect_success '--word-diff=plain' '
+	cat >expect <<-\EOF &&
+		diff --git a/pre b/post
+		index 330b04f..5ed8eff 100644
+		--- a/pre
+		+++ b/post
+		@@ -1,3 +1,7 @@
+		[-h(4)-]{+h(4),hh[44]+}
 
-	word_diff --word-diff=plain
+		a = b + c
 
-'
-
-test_expect_success '--word-diff=plain --no-color' '
+		{+aa = a+}
 
+		{+aeff = aeff * ( aaa )+}
+	EOF
+	word_diff --word-diff=plain &&
 	word_diff --word-diff=plain --no-color
-
 '
 
-cat > expect <<EOF
-<BOLD>diff --git a/pre b/post<RESET>
-<BOLD>index 330b04f..5ed8eff 100644<RESET>
-<BOLD>--- a/pre<RESET>
-<BOLD>+++ b/post<RESET>
-<CYAN>@@ -1,3 +1,7 @@<RESET>
-<RED>[-h(4)-]<RESET><GREEN>{+h(4),hh[44]+}<RESET>
-
-a = b + c<RESET>
-
-<GREEN>{+aa = a+}<RESET>
-
-<GREEN>{+aeff = aeff * ( aaa )+}<RESET>
-EOF
-
 test_expect_success '--word-diff=plain --color' '
+	cat >expect <<-\EOF &&
+		<BOLD>diff --git a/pre b/post<RESET>
+		<BOLD>index 330b04f..5ed8eff 100644<RESET>
+		<BOLD>--- a/pre<RESET>
+		<BOLD>+++ b/post<RESET>
+		<CYAN>@@ -1,3 +1,7 @@<RESET>
+		<RED>[-h(4)-]<RESET><GREEN>{+h(4),hh[44]+}<RESET>
 
+		a = b + c<RESET>
+
+		<GREEN>{+aa = a+}<RESET>
+
+		<GREEN>{+aeff = aeff * ( aaa )+}<RESET>
+	EOF
 	word_diff --word-diff=plain --color
-
 '
 
-cat > expect <<\EOF
-<BOLD>diff --git a/pre b/post<RESET>
-<BOLD>index 330b04f..5ed8eff 100644<RESET>
-<BOLD>--- a/pre<RESET>
-<BOLD>+++ b/post<RESET>
-<CYAN>@@ -1 +1 @@<RESET>
-<RED>h(4)<RESET><GREEN>h(4),hh[44]<RESET>
-<CYAN>@@ -3,0 +4,4 @@<RESET> <RESET><MAGENTA>a = b + c<RESET>
-
-<GREEN>aa = a<RESET>
-
-<GREEN>aeff = aeff * ( aaa )<RESET>
-EOF
-
 test_expect_success 'word diff without context' '
+	cat >expect <<-\EOF &&
+		<BOLD>diff --git a/pre b/post<RESET>
+		<BOLD>index 330b04f..5ed8eff 100644<RESET>
+		<BOLD>--- a/pre<RESET>
+		<BOLD>+++ b/post<RESET>
+		<CYAN>@@ -1 +1 @@<RESET>
+		<RED>h(4)<RESET><GREEN>h(4),hh[44]<RESET>
+		<CYAN>@@ -3,0 +4,4 @@<RESET> <RESET><MAGENTA>a = b + c<RESET>
 
+		<GREEN>aa = a<RESET>
+
+		<GREEN>aeff = aeff * ( aaa )<RESET>
+	EOF
 	word_diff --color-words --unified=0
-
 '
 
-cat > expect <<\EOF
-<BOLD>diff --git a/pre b/post<RESET>
-<BOLD>index 330b04f..5ed8eff 100644<RESET>
-<BOLD>--- a/pre<RESET>
-<BOLD>+++ b/post<RESET>
-<CYAN>@@ -1,3 +1,7 @@<RESET>
-h(4),<GREEN>hh<RESET>[44]
-
-a = b + c<RESET>
-
-<GREEN>aa = a<RESET>
-
-<GREEN>aeff = aeff * ( aaa<RESET> )
-EOF
-cp expect expect.letter-runs-are-words
-
 test_expect_success 'word diff with a regular expression' '
-
+	cp expect.letter-runs-are-words expect &&
 	word_diff --color-words="[a-z]+"
-
 '
 
-test_expect_success 'set a diff driver' '
+test_expect_success 'set up a diff driver' '
 	git config diff.testdriver.wordRegex "[^[:space:]]" &&
-	cat <<EOF > .gitattributes
-pre diff=testdriver
-post diff=testdriver
-EOF
+	cat <<-\EOF >.gitattributes
+		pre diff=testdriver
+		post diff=testdriver
+	EOF
 '
 
 test_expect_success 'option overrides .gitattributes' '
-
+	cp expect.letter-runs-are-words expect &&
 	word_diff --color-words="[a-z]+"
-
 '
 
-cat > expect <<\EOF
-<BOLD>diff --git a/pre b/post<RESET>
-<BOLD>index 330b04f..5ed8eff 100644<RESET>
-<BOLD>--- a/pre<RESET>
-<BOLD>+++ b/post<RESET>
-<CYAN>@@ -1,3 +1,7 @@<RESET>
-h(4)<GREEN>,hh[44]<RESET>
-
-a = b + c<RESET>
-
-<GREEN>aa = a<RESET>
-
-<GREEN>aeff = aeff * ( aaa )<RESET>
-EOF
-cp expect expect.non-whitespace-is-word
-
 test_expect_success 'use regex supplied by driver' '
-
+	cp expect.non-whitespace-is-word expect &&
 	word_diff --color-words
-
 '
 
-test_expect_success 'set diff.wordRegex option' '
+test_expect_success 'set up diff.wordRegex option' '
 	git config diff.wordRegex "[[:alnum:]]+"
 '
 
-cp expect.letter-runs-are-words expect
-
 test_expect_success 'command-line overrides config' '
+	cp expect.letter-runs-are-words expect &&
 	word_diff --color-words="[a-z]+"
 '
 
-cat > expect <<\EOF
-<BOLD>diff --git a/pre b/post<RESET>
-<BOLD>index 330b04f..5ed8eff 100644<RESET>
-<BOLD>--- a/pre<RESET>
-<BOLD>+++ b/post<RESET>
-<CYAN>@@ -1,3 +1,7 @@<RESET>
-h(4),<GREEN>{+hh+}<RESET>[44]
-
-a = b + c<RESET>
-
-<GREEN>{+aa = a+}<RESET>
-
-<GREEN>{+aeff = aeff * ( aaa+}<RESET> )
-EOF
-
 test_expect_success 'command-line overrides config: --word-diff-regex' '
+	cat >expect <<-\EOF &&
+		<BOLD>diff --git a/pre b/post<RESET>
+		<BOLD>index 330b04f..5ed8eff 100644<RESET>
+		<BOLD>--- a/pre<RESET>
+		<BOLD>+++ b/post<RESET>
+		<CYAN>@@ -1,3 +1,7 @@<RESET>
+		h(4),<GREEN>{+hh+}<RESET>[44]
+
+		a = b + c<RESET>
+
+		<GREEN>{+aa = a+}<RESET>
+
+		<GREEN>{+aeff = aeff * ( aaa+}<RESET> )
+	EOF
 	word_diff --color --word-diff-regex="[a-z]+"
 '
 
-cp expect.non-whitespace-is-word expect
-
 test_expect_success '.gitattributes override config' '
+	cp expect.non-whitespace-is-word expect &&
 	word_diff --color-words
 '
 
-test_expect_success 'remove diff driver regex' '
-	git config --unset diff.testdriver.wordRegex
+test_expect_success 'setup: remove diff driver regex' '
+	test_might_fail git config --unset diff.testdriver.wordRegex
 '
 
-cat > expect <<\EOF
-<BOLD>diff --git a/pre b/post<RESET>
-<BOLD>index 330b04f..5ed8eff 100644<RESET>
-<BOLD>--- a/pre<RESET>
-<BOLD>+++ b/post<RESET>
-<CYAN>@@ -1,3 +1,7 @@<RESET>
-h(4),<GREEN>hh[44<RESET>]
-
-a = b + c<RESET>
-
-<GREEN>aa = a<RESET>
-
-<GREEN>aeff = aeff * ( aaa<RESET> )
-EOF
-
 test_expect_success 'use configured regex' '
+	cat >expect <<-\EOF &&
+		<BOLD>diff --git a/pre b/post<RESET>
+		<BOLD>index 330b04f..5ed8eff 100644<RESET>
+		<BOLD>--- a/pre<RESET>
+		<BOLD>+++ b/post<RESET>
+		<CYAN>@@ -1,3 +1,7 @@<RESET>
+		h(4),<GREEN>hh[44<RESET>]
+
+		a = b + c<RESET>
+
+		<GREEN>aa = a<RESET>
+
+		<GREEN>aeff = aeff * ( aaa<RESET> )
+	EOF
 	word_diff --color-words
 '
 
-echo 'aaa (aaa)' > pre
-echo 'aaa (aaa) aaa' > post
-
-cat > expect <<\EOF
-<BOLD>diff --git a/pre b/post<RESET>
-<BOLD>index c29453b..be22f37 100644<RESET>
-<BOLD>--- a/pre<RESET>
-<BOLD>+++ b/post<RESET>
-<CYAN>@@ -1 +1 @@<RESET>
-aaa (aaa) <GREEN>aaa<RESET>
-EOF
-
 test_expect_success 'test parsing words for newline' '
-
+	echo "aaa (aaa)" >pre &&
+	echo "aaa (aaa) aaa" >post &&
+	cat >expect <<-\EOF &&
+		<BOLD>diff --git a/pre b/post<RESET>
+		<BOLD>index c29453b..be22f37 100644<RESET>
+		<BOLD>--- a/pre<RESET>
+		<BOLD>+++ b/post<RESET>
+		<CYAN>@@ -1 +1 @@<RESET>
+		aaa (aaa) <GREEN>aaa<RESET>
+	EOF
 	word_diff --color-words="a+"
-
-
 '
 
-echo '(:' > pre
-echo '(' > post
-
-cat > expect <<\EOF
-<BOLD>diff --git a/pre b/post<RESET>
-<BOLD>index 289cb9d..2d06f37 100644<RESET>
-<BOLD>--- a/pre<RESET>
-<BOLD>+++ b/post<RESET>
-<CYAN>@@ -1 +1 @@<RESET>
-(<RED>:<RESET>
-EOF
-
 test_expect_success 'test when words are only removed at the end' '
-
+	echo "(:" >pre &&
+	echo "(" >post &&
+	cat >expect <<-\EOF &&
+		<BOLD>diff --git a/pre b/post<RESET>
+		<BOLD>index 289cb9d..2d06f37 100644<RESET>
+		<BOLD>--- a/pre<RESET>
+		<BOLD>+++ b/post<RESET>
+		<CYAN>@@ -1 +1 @@<RESET>
+		(<RED>:<RESET>
+	EOF
 	word_diff --color-words=.
-
 '
 
-cat > expect <<\EOF
-diff --git a/pre b/post
-index 289cb9d..2d06f37 100644
---- a/pre
-+++ b/post
-@@ -1 +1 @@
--(:
-+(
-EOF
-
 test_expect_success '--word-diff=none' '
-
+	echo "(:" >pre &&
+	echo "(" >post &&
+	cat >expect <<-\EOF &&
+		diff --git a/pre b/post
+		index 289cb9d..2d06f37 100644
+		--- a/pre
+		+++ b/post
+		@@ -1 +1 @@
+		-(:
+		+(
+	EOF
 	word_diff --word-diff=plain --word-diff=none
-
 '
 
-word_diff_for_language () {
-	cp "$TEST_DIRECTORY/t4034/$1/pre" \
-		"$TEST_DIRECTORY/t4034/$1/post" \
-		"$TEST_DIRECTORY/t4034/$1/expect" . &&
-	echo "* diff=$1" >.gitattributes &&
-	word_diff --color-words && cp output output.$1
-}
-
-for lang_dir in $TEST_DIRECTORY/t4034/*; do
-	lang=${lang_dir#$TEST_DIRECTORY/t4034/}
-	test_expect_success "diff driver '$lang' has sane word regex" "
-		word_diff_for_language $lang
-	"
-done
+test_language_driver bibtex
+test_language_driver cpp
+test_language_driver csharp
+test_language_driver fortran
+test_language_driver html
+test_language_driver java
+test_language_driver objc
+test_language_driver pascal
+test_language_driver php
+test_language_driver python
+test_language_driver ruby
+test_language_driver tex
 
 test_done

-- 
1.7.4.rc1

Thomas Rast· Dec 18, 2010, 16:24 UTC · re: Thomas Rast · lore

Re: [PATCH v2 0/4] --word-regex sanity checking and such

I wrote:

>   diff.c: pass struct diff_words into find_word_boundaries
>   diff.c: implement a sanity check for word regexes
>   userdiff: fix typo in ruby and python word regexes
>   t4034: bulk verify builtin word regex sanity

BTW, Junio, you could move the third patch to the front and merge it to maint. I think it's an obvious fix to a real bug, and it does not depend on the other patches except that the test in 4/4 will fail without the fix.

-- 
Thomas Rast
trast@{inf,student}.ethz.ch

Junio C Hamano· Dec 18, 2010, 20:48 UTC · re: Thomas Rast · lore

Re: [PATCH v2 0/4] --word-regex sanity checking and such

Thomas Rast <trast@student.ethz.ch> writes:

Show 10 quoted lines

> I wrote:
>>   diff.c: pass struct diff_words into find_word_boundaries
>>   diff.c: implement a sanity check for word regexes
>>   userdiff: fix typo in ruby and python word regexes
>>   t4034: bulk verify builtin word regex sanity
>
> BTW, Junio, you could move the third patch to the front and merge it
> to maint.  I think it's an obvious fix to a real bug, and it does not
> depend on the other patches except that the test in 4/4 will fail
> without the fix.

Makes sense; thanks.