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Load pcre-1.01 into code/trunk.

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

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