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Sat Feb 24 21:38:09 2007 UTC (7 years, 8 months ago) by nigel
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Load pcre-1.02 into code/trunk.

1 nigel 3 ChangeLog for PCRE
2     ------------------
3    
4 nigel 5
5 nigel 7 Version 1.02 12-Dec-97
6     ----------------------
7    
8     1. Typos in pcre.3 and comments in the source fixed.
9    
10     2. Applied a contributed patch to get rid of places where it used to remove
11     'const' from variables, and fixed some signed/unsigned and uninitialized
12     variable warnings.
13    
14     3. Added the "runtest" target to Makefile.
15    
16     4. Set default compiler flag to -O2 rather than just -O.
17    
18    
19 nigel 5 Version 1.01 19-Nov-97
20     ----------------------
21    
22     1. PCRE was failing to diagnose unlimited repeat of empty string for patterns
23     like /([ab]*)*/, that is, for classes with more than one character in them.
24    
25     2. Likewise, it wasn't diagnosing patterns with "once-only" subpatterns, such
26     as /((?>a*))*/ (a PCRE_EXTRA facility).
27    
28    
29     Version 1.00 18-Nov-97
30     ----------------------
31    
32     1. Added compile-time macros to support systems such as SunOS4 which don't have
33     memmove() or strerror() but have other things that can be used instead.
34    
35     2. Arranged that "make clean" removes the executables.
36    
37    
38 nigel 3 Version 0.99 27-Oct-97
39     ----------------------
40    
41     1. Fixed bug in code for optimizing classes with only one character. It was
42     initializing a 32-byte map regardless, which could cause it to run off the end
43     of the memory it had got.
44    
45     2. Added, conditional on PCRE_EXTRA, the proposed (?>REGEX) construction.
46    
47    
48     Version 0.98 22-Oct-97
49     ----------------------
50    
51     1. Fixed bug in code for handling temporary memory usage when there are more
52     back references than supplied space in the ovector. This could cause segfaults.
53    
54    
55     Version 0.97 21-Oct-97
56     ----------------------
57    
58     1. Added the \X "cut" facility, conditional on PCRE_EXTRA.
59    
60     2. Optimized negated single characters not to use a bit map.
61    
62     3. Brought error texts together as macro definitions; clarified some of them;
63     fixed one that was wrong - it said "range out of order" when it meant "invalid
64     escape sequence".
65    
66     4. Changed some char * arguments to const char *.
67    
68     5. Added PCRE_NOTBOL and PCRE_NOTEOL (from POSIX).
69    
70     6. Added the POSIX-style API wrapper in pcreposix.a and testing facilities in
71     pcretest.
72    
73    
74     Version 0.96 16-Oct-97
75     ----------------------
76    
77     1. Added a simple "pgrep" utility to the distribution.
78    
79     2. Fixed an incompatibility with Perl: "{" is now treated as a normal character
80     unless it appears in one of the precise forms "{ddd}", "{ddd,}", or "{ddd,ddd}"
81     where "ddd" means "one or more decimal digits".
82    
83     3. Fixed serious bug. If a pattern had a back reference, but the call to
84     pcre_exec() didn't supply a large enough ovector to record the related
85     identifying subpattern, the match always failed. PCRE now remembers the number
86     of the largest back reference, and gets some temporary memory in which to save
87     the offsets during matching if necessary, in order to ensure that
88     backreferences always work.
89    
90     4. Increased the compatibility with Perl in a number of ways:
91    
92     (a) . no longer matches \n by default; an option PCRE_DOTALL is provided
93     to request this handling. The option can be set at compile or exec time.
94    
95     (b) $ matches before a terminating newline by default; an option
96     PCRE_DOLLAR_ENDONLY is provided to override this (but not in multiline
97     mode). The option can be set at compile or exec time.
98    
99     (c) The handling of \ followed by a digit other than 0 is now supposed to be
100     the same as Perl's. If the decimal number it represents is less than 10
101     or there aren't that many previous left capturing parentheses, an octal
102     escape is read. Inside a character class, it's always an octal escape,
103     even if it is a single digit.
104    
105     (d) An escaped but undefined alphabetic character is taken as a literal,
106     unless PCRE_EXTRA is set. Currently this just reserves the remaining
107     escapes.
108    
109     (e) {0} is now permitted. (The previous item is removed from the compiled
110     pattern).
111    
112     5. Changed all the names of code files so that the basic parts are no longer
113     than 10 characters, and abolished the teeny "globals.c" file.
114    
115     6. Changed the handling of character classes; they are now done with a 32-byte
116     bit map always.
117    
118     7. Added the -d and /D options to pcretest to make it possible to look at the
119     internals of compilation without having to recompile pcre.
120    
121    
122     Version 0.95 23-Sep-97
123     ----------------------
124    
125     1. Fixed bug in pre-pass concerning escaped "normal" characters such as \x5c or
126     \x20 at the start of a run of normal characters. These were being treated as
127     real characters, instead of the source characters being re-checked.
128    
129    
130     Version 0.94 18-Sep-97
131     ----------------------
132    
133     1. The functions are now thread-safe, with the caveat that the global variables
134     containing pointers to malloc() and free() or alternative functions are the
135     same for all threads.
136    
137     2. Get pcre_study() to generate a bitmap of initial characters for non-
138     anchored patterns when this is possible, and use it if passed to pcre_exec().
139    
140    
141     Version 0.93 15-Sep-97
142     ----------------------
143    
144     1. /(b)|(:+)/ was computing an incorrect first character.
145    
146     2. Add pcre_study() to the API and the passing of pcre_extra to pcre_exec(),
147     but not actually doing anything yet.
148    
149     3. Treat "-" characters in classes that cannot be part of ranges as literals,
150     as Perl does (e.g. [-az] or [az-]).
151    
152     4. Set the anchored flag if a branch starts with .* or .*? because that tests
153     all possible positions.
154    
155     5. Split up into different modules to avoid including unneeded functions in a
156     compiled binary. However, compile and exec are still in one module. The "study"
157     function is split off.
158    
159     6. The character tables are now in a separate module whose source is generated
160     by an auxiliary program - but can then be edited by hand if required. There are
161     now no calls to isalnum(), isspace(), isdigit(), isxdigit(), tolower() or
162     toupper() in the code.
163    
164     7. Turn the malloc/free funtions variables into pcre_malloc and pcre_free and
165     make them global. Abolish the function for setting them, as the caller can now
166     set them directly.
167    
168    
169     Version 0.92 11-Sep-97
170     ----------------------
171    
172     1. A repeat with a fixed maximum and a minimum of 1 for an ordinary character
173     (e.g. /a{1,3}/) was broken (I mis-optimized it).
174    
175     2. Caseless matching was not working in character classes if the characters in
176     the pattern were in upper case.
177    
178     3. Make ranges like [W-c] work in the same way as Perl for caseless matching.
179    
180     4. Make PCRE_ANCHORED public and accept as a compile option.
181    
182     5. Add an options word to pcre_exec() and accept PCRE_ANCHORED and
183     PCRE_CASELESS at run time. Add escapes \A and \I to pcretest to cause it to
184     pass them.
185    
186     6. Give an error if bad option bits passed at compile or run time.
187    
188     7. Add PCRE_MULTILINE at compile and exec time, and (?m) as well. Add \M to
189     pcretest to cause it to pass that flag.
190    
191     8. Add pcre_info(), to get the number of identifying subpatterns, the stored
192     options, and the first character, if set.
193    
194     9. Recognize C+ or C{n,m} where n >= 1 as providing a fixed starting character.
195    
196    
197     Version 0.91 10-Sep-97
198     ----------------------
199    
200     1. PCRE was failing to diagnose unlimited repeats of subpatterns that could
201     match the empty string as in /(a*)*/. It was looping and ultimately crashing.
202    
203     2. PCRE was looping on encountering an indefinitely repeated back reference to
204     a subpattern that had matched an empty string, e.g. /(a|)\1*/. It now does what
205     Perl does - treats the match as successful.
206    
207     ****

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