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Tag code/trunk as code/tags/pcre-2.00.

1 nigel 3 ChangeLog for PCRE
2     ------------------
3    
4 nigel 5
5 nigel 23 Version 2.00 24-Sep-98
6 nigel 21 ----------------------
7    
8 nigel 23 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 nigel 21 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 nigel 19 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 nigel 17 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 nigel 15 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 nigel 13 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 nigel 11 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 nigel 9 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 nigel 11 \d{8}\d{0,65527} instead of \d{8}\d* which didn't make much difference to the
152 nigel 9 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 nigel 7 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 nigel 5 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 nigel 3 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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