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Sat Feb 24 21:38:41 2007 UTC (7 years, 7 months ago) by nigel
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Load pcre-2.00 into code/trunk.

1 ChangeLog for PCRE
2 ------------------
3
4
5 Version 2.00 24-Sep-98
6 ----------------------
7
8 1. Since the (>?) facility is in Perl 5.005, don't require PCRE_EXTRA to enable
9 it any more.
10
11 2. Allow quantification of (?>) groups, and make it work correctly.
12
13 3. The first character computation wasn't working for (?>) groups.
14
15 4. Correct the implementation of \Z (it is permitted to match on the \n at the
16 end of the subject) and add 5.005's \z, which really does match only at the
17 very end of the subject.
18
19 5. Remove the \X "cut" facility; Perl doesn't have it, and (?> is neater.
20
21 6. Remove the ability to specify CASELESS, MULTILINE, DOTALL, and
22 DOLLAR_END_ONLY at runtime, to make it possible to implement the Perl 5.005
23 localized options. All options to pcre_study() were also removed.
24
25 7. Add other new features from 5.005:
26
27 $(?<= positive lookbehind
28 $(?<! negative lookbehind
29 (?imsx-imsx) added the unsetting capability
30 such a setting is global if at outer level; local otherwise
31 (?imsx-imsx:) non-capturing groups with option setting
32 (?(cond)re|re) conditional pattern matching
33
34 A backreference to itself in a repeated group matches the previous
35 captured string.
36
37 8. General tidying up of studying (both automatic and via "study")
38 consequential on the addition of new assertions.
39
40 9. As in 5.005, unlimited repeated groups that could match an empty substring
41 are no longer faulted at compile time. Instead, the loop is forcibly broken at
42 runtime if any iteration does actually match an empty substring.
43
44 10. Include the RunTest script in the distribution.
45
46 11. Added tests from the Perl 5.005_02 distribution. This showed up a few
47 discrepancies, some of which were old and were also with respect to 5.004. They
48 have now been fixed.
49
50
51 Version 1.09 28-Apr-98
52 ----------------------
53
54 1. A negated single character class followed by a quantifier with a minimum
55 value of one (e.g. [^x]{1,6} ) was not compiled correctly. This could lead to
56 program crashes, or just wrong answers. This did not apply to negated classes
57 containing more than one character, or to minima other than one.
58
59
60 Version 1.08 27-Mar-98
61 ----------------------
62
63 1. Add PCRE_UNGREEDY to invert the greediness of quantifiers.
64
65 2. Add (?U) and (?X) to set PCRE_UNGREEDY and PCRE_EXTRA respectively. The
66 latter must appear before anything that relies on it in the pattern.
67
68
69 Version 1.07 16-Feb-98
70 ----------------------
71
72 1. A pattern such as /((a)*)*/ was not being diagnosed as in error (unlimited
73 repeat of a potentially empty string).
74
75
76 Version 1.06 23-Jan-98
77 ----------------------
78
79 1. Added Markus Oberhumer's little patches for C++.
80
81 2. Literal strings longer than 255 characters were broken.
82
83
84 Version 1.05 23-Dec-97
85 ----------------------
86
87 1. Negated character classes containing more than one character were failing if
88 PCRE_CASELESS was set at run time.
89
90
91 Version 1.04 19-Dec-97
92 ----------------------
93
94 1. Corrected the man page, where some "const" qualifiers had been omitted.
95
96 2. Made debugging output print "{0,xxx}" instead of just "{,xxx}" to agree with
97 input syntax.
98
99 3. Fixed memory leak which occurred when a regex with back references was
100 matched with an offsets vector that wasn't big enough. The temporary memory
101 that is used in this case wasn't being freed if the match failed.
102
103 4. Tidied pcretest to ensure it frees memory that it gets.
104
105 5. Temporary memory was being obtained in the case where the passed offsets
106 vector was exactly big enough.
107
108 6. Corrected definition of offsetof() from change 5 below.
109
110 7. I had screwed up change 6 below and broken the rules for the use of
111 setjmp(). Now fixed.
112
113
114 Version 1.03 18-Dec-97
115 ----------------------
116
117 1. A erroneous regex with a missing opening parenthesis was correctly
118 diagnosed, but PCRE attempted to access brastack[-1], which could cause crashes
119 on some systems.
120
121 2. Replaced offsetof(real_pcre, code) by offsetof(real_pcre, code[0]) because
122 it was reported that one broken compiler failed on the former because "code" is
123 also an independent variable.
124
125 3. The erroneous regex a[]b caused an array overrun reference.
126
127 4. A regex ending with a one-character negative class (e.g. /[^k]$/) did not
128 fail on data ending with that character. (It was going on too far, and checking
129 the next character, typically a binary zero.) This was specific to the
130 optimized code for single-character negative classes.
131
132 5. Added a contributed patch from the TIN world which does the following:
133
134 + Add an undef for memmove, in case the the system defines a macro for it.
135
136 + Add a definition of offsetof(), in case there isn't one. (I don't know
137 the reason behind this - offsetof() is part of the ANSI standard - but
138 it does no harm).
139
140 + Reduce the ifdef's in pcre.c using macro DPRINTF, thereby eliminating
141 most of the places where whitespace preceded '#'. I have given up and
142 allowed the remaining 2 cases to be at the margin.
143
144 + Rename some variables in pcre to eliminate shadowing. This seems very
145 pedantic, but does no harm, of course.
146
147 6. Moved the call to setjmp() into its own function, to get rid of warnings
148 from gcc -Wall, and avoided calling it at all unless PCRE_EXTRA is used.
149
150 7. Constructs such as \d{8,} were compiling into the equivalent of
151 \d{8}\d{0,65527} instead of \d{8}\d* which didn't make much difference to the
152 outcome, but in this particular case used more store than had been allocated,
153 which caused the bug to be discovered because it threw up an internal error.
154
155 8. The debugging code in both pcre and pcretest for outputting the compiled
156 form of a regex was going wrong in the case of back references followed by
157 curly-bracketed repeats.
158
159
160 Version 1.02 12-Dec-97
161 ----------------------
162
163 1. Typos in pcre.3 and comments in the source fixed.
164
165 2. Applied a contributed patch to get rid of places where it used to remove
166 'const' from variables, and fixed some signed/unsigned and uninitialized
167 variable warnings.
168
169 3. Added the "runtest" target to Makefile.
170
171 4. Set default compiler flag to -O2 rather than just -O.
172
173
174 Version 1.01 19-Nov-97
175 ----------------------
176
177 1. PCRE was failing to diagnose unlimited repeat of empty string for patterns
178 like /([ab]*)*/, that is, for classes with more than one character in them.
179
180 2. Likewise, it wasn't diagnosing patterns with "once-only" subpatterns, such
181 as /((?>a*))*/ (a PCRE_EXTRA facility).
182
183
184 Version 1.00 18-Nov-97
185 ----------------------
186
187 1. Added compile-time macros to support systems such as SunOS4 which don't have
188 memmove() or strerror() but have other things that can be used instead.
189
190 2. Arranged that "make clean" removes the executables.
191
192
193 Version 0.99 27-Oct-97
194 ----------------------
195
196 1. Fixed bug in code for optimizing classes with only one character. It was
197 initializing a 32-byte map regardless, which could cause it to run off the end
198 of the memory it had got.
199
200 2. Added, conditional on PCRE_EXTRA, the proposed (?>REGEX) construction.
201
202
203 Version 0.98 22-Oct-97
204 ----------------------
205
206 1. Fixed bug in code for handling temporary memory usage when there are more
207 back references than supplied space in the ovector. This could cause segfaults.
208
209
210 Version 0.97 21-Oct-97
211 ----------------------
212
213 1. Added the \X "cut" facility, conditional on PCRE_EXTRA.
214
215 2. Optimized negated single characters not to use a bit map.
216
217 3. Brought error texts together as macro definitions; clarified some of them;
218 fixed one that was wrong - it said "range out of order" when it meant "invalid
219 escape sequence".
220
221 4. Changed some char * arguments to const char *.
222
223 5. Added PCRE_NOTBOL and PCRE_NOTEOL (from POSIX).
224
225 6. Added the POSIX-style API wrapper in pcreposix.a and testing facilities in
226 pcretest.
227
228
229 Version 0.96 16-Oct-97
230 ----------------------
231
232 1. Added a simple "pgrep" utility to the distribution.
233
234 2. Fixed an incompatibility with Perl: "{" is now treated as a normal character
235 unless it appears in one of the precise forms "{ddd}", "{ddd,}", or "{ddd,ddd}"
236 where "ddd" means "one or more decimal digits".
237
238 3. Fixed serious bug. If a pattern had a back reference, but the call to
239 pcre_exec() didn't supply a large enough ovector to record the related
240 identifying subpattern, the match always failed. PCRE now remembers the number
241 of the largest back reference, and gets some temporary memory in which to save
242 the offsets during matching if necessary, in order to ensure that
243 backreferences always work.
244
245 4. Increased the compatibility with Perl in a number of ways:
246
247 (a) . no longer matches \n by default; an option PCRE_DOTALL is provided
248 to request this handling. The option can be set at compile or exec time.
249
250 (b) $ matches before a terminating newline by default; an option
251 PCRE_DOLLAR_ENDONLY is provided to override this (but not in multiline
252 mode). The option can be set at compile or exec time.
253
254 (c) The handling of \ followed by a digit other than 0 is now supposed to be
255 the same as Perl's. If the decimal number it represents is less than 10
256 or there aren't that many previous left capturing parentheses, an octal
257 escape is read. Inside a character class, it's always an octal escape,
258 even if it is a single digit.
259
260 (d) An escaped but undefined alphabetic character is taken as a literal,
261 unless PCRE_EXTRA is set. Currently this just reserves the remaining
262 escapes.
263
264 (e) {0} is now permitted. (The previous item is removed from the compiled
265 pattern).
266
267 5. Changed all the names of code files so that the basic parts are no longer
268 than 10 characters, and abolished the teeny "globals.c" file.
269
270 6. Changed the handling of character classes; they are now done with a 32-byte
271 bit map always.
272
273 7. Added the -d and /D options to pcretest to make it possible to look at the
274 internals of compilation without having to recompile pcre.
275
276
277 Version 0.95 23-Sep-97
278 ----------------------
279
280 1. Fixed bug in pre-pass concerning escaped "normal" characters such as \x5c or
281 \x20 at the start of a run of normal characters. These were being treated as
282 real characters, instead of the source characters being re-checked.
283
284
285 Version 0.94 18-Sep-97
286 ----------------------
287
288 1. The functions are now thread-safe, with the caveat that the global variables
289 containing pointers to malloc() and free() or alternative functions are the
290 same for all threads.
291
292 2. Get pcre_study() to generate a bitmap of initial characters for non-
293 anchored patterns when this is possible, and use it if passed to pcre_exec().
294
295
296 Version 0.93 15-Sep-97
297 ----------------------
298
299 1. /(b)|(:+)/ was computing an incorrect first character.
300
301 2. Add pcre_study() to the API and the passing of pcre_extra to pcre_exec(),
302 but not actually doing anything yet.
303
304 3. Treat "-" characters in classes that cannot be part of ranges as literals,
305 as Perl does (e.g. [-az] or [az-]).
306
307 4. Set the anchored flag if a branch starts with .* or .*? because that tests
308 all possible positions.
309
310 5. Split up into different modules to avoid including unneeded functions in a
311 compiled binary. However, compile and exec are still in one module. The "study"
312 function is split off.
313
314 6. The character tables are now in a separate module whose source is generated
315 by an auxiliary program - but can then be edited by hand if required. There are
316 now no calls to isalnum(), isspace(), isdigit(), isxdigit(), tolower() or
317 toupper() in the code.
318
319 7. Turn the malloc/free funtions variables into pcre_malloc and pcre_free and
320 make them global. Abolish the function for setting them, as the caller can now
321 set them directly.
322
323
324 Version 0.92 11-Sep-97
325 ----------------------
326
327 1. A repeat with a fixed maximum and a minimum of 1 for an ordinary character
328 (e.g. /a{1,3}/) was broken (I mis-optimized it).
329
330 2. Caseless matching was not working in character classes if the characters in
331 the pattern were in upper case.
332
333 3. Make ranges like [W-c] work in the same way as Perl for caseless matching.
334
335 4. Make PCRE_ANCHORED public and accept as a compile option.
336
337 5. Add an options word to pcre_exec() and accept PCRE_ANCHORED and
338 PCRE_CASELESS at run time. Add escapes \A and \I to pcretest to cause it to
339 pass them.
340
341 6. Give an error if bad option bits passed at compile or run time.
342
343 7. Add PCRE_MULTILINE at compile and exec time, and (?m) as well. Add \M to
344 pcretest to cause it to pass that flag.
345
346 8. Add pcre_info(), to get the number of identifying subpatterns, the stored
347 options, and the first character, if set.
348
349 9. Recognize C+ or C{n,m} where n >= 1 as providing a fixed starting character.
350
351
352 Version 0.91 10-Sep-97
353 ----------------------
354
355 1. PCRE was failing to diagnose unlimited repeats of subpatterns that could
356 match the empty string as in /(a*)*/. It was looping and ultimately crashing.
357
358 2. PCRE was looping on encountering an indefinitely repeated back reference to
359 a subpattern that had matched an empty string, e.g. /(a|)\1*/. It now does what
360 Perl does - treats the match as successful.
361
362 ****

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