1: // Copyright (c) 2005, Google Inc.
2: // All rights reserved.
3: //
4: // Redistribution and use in source and binary forms, with or without
5: // modification, are permitted provided that the following conditions are
6: // met:
7: //
8: // * Redistributions of source code must retain the above copyright
9: // notice, this list of conditions and the following disclaimer.
10: // * Redistributions in binary form must reproduce the above
11: // copyright notice, this list of conditions and the following disclaimer
12: // in the documentation and/or other materials provided with the
13: // distribution.
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15: // contributors may be used to endorse or promote products derived from
16: // this software without specific prior written permission.
17: //
18: // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19: // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20: // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21: // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22: // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23: // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24: // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25: // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26: // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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28: // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29: //
30: // Author: Sanjay Ghemawat
31: // Support for PCRE_XXX modifiers added by Giuseppe Maxia, July 2005
32:
33: #ifndef _PCRECPP_H
34: #define _PCRECPP_H
35:
36: // C++ interface to the pcre regular-expression library. RE supports
37: // Perl-style regular expressions (with extensions like \d, \w, \s,
38: // ...).
39: //
40: // -----------------------------------------------------------------------
41: // REGEXP SYNTAX:
42: //
43: // This module is part of the pcre library and hence supports its syntax
44: // for regular expressions.
45: //
46: // The syntax is pretty similar to Perl's. For those not familiar
47: // with Perl's regular expressions, here are some examples of the most
48: // commonly used extensions:
49: //
50: // "hello (\\w+) world" -- \w matches a "word" character
51: // "version (\\d+)" -- \d matches a digit
52: // "hello\\s+world" -- \s matches any whitespace character
53: // "\\b(\\w+)\\b" -- \b matches empty string at a word boundary
54: // "(?i)hello" -- (?i) turns on case-insensitive matching
55: // "/\\*(.*?)\\*/" -- .*? matches . minimum no. of times possible
56: //
57: // -----------------------------------------------------------------------
58: // MATCHING INTERFACE:
59: //
60: // The "FullMatch" operation checks that supplied text matches a
61: // supplied pattern exactly.
62: //
63: // Example: successful match
64: // pcrecpp::RE re("h.*o");
65: // re.FullMatch("hello");
66: //
67: // Example: unsuccessful match (requires full match):
68: // pcrecpp::RE re("e");
69: // !re.FullMatch("hello");
70: //
71: // Example: creating a temporary RE object:
72: // pcrecpp::RE("h.*o").FullMatch("hello");
73: //
74: // You can pass in a "const char*" or a "string" for "text". The
75: // examples below tend to use a const char*.
76: //
77: // You can, as in the different examples above, store the RE object
78: // explicitly in a variable or use a temporary RE object. The
79: // examples below use one mode or the other arbitrarily. Either
80: // could correctly be used for any of these examples.
81: //
82: // -----------------------------------------------------------------------
83: // MATCHING WITH SUB-STRING EXTRACTION:
84: //
85: // You can supply extra pointer arguments to extract matched subpieces.
86: //
87: // Example: extracts "ruby" into "s" and 1234 into "i"
88: // int i;
89: // string s;
90: // pcrecpp::RE re("(\\w+):(\\d+)");
91: // re.FullMatch("ruby:1234", &s, &i);
92: //
93: // Example: does not try to extract any extra sub-patterns
94: // re.FullMatch("ruby:1234", &s);
95: //
96: // Example: does not try to extract into NULL
97: // re.FullMatch("ruby:1234", NULL, &i);
98: //
99: // Example: integer overflow causes failure
100: // !re.FullMatch("ruby:1234567891234", NULL, &i);
101: //
102: // Example: fails because there aren't enough sub-patterns:
103: // !pcrecpp::RE("\\w+:\\d+").FullMatch("ruby:1234", &s);
104: //
105: // Example: fails because string cannot be stored in integer
106: // !pcrecpp::RE("(.*)").FullMatch("ruby", &i);
107: //
108: // The provided pointer arguments can be pointers to any scalar numeric
109: // type, or one of
110: // string (matched piece is copied to string)
111: // StringPiece (StringPiece is mutated to point to matched piece)
112: // T (where "bool T::ParseFrom(const char*, int)" exists)
113: // NULL (the corresponding matched sub-pattern is not copied)
114: //
115: // CAVEAT: An optional sub-pattern that does not exist in the matched
116: // string is assigned the empty string. Therefore, the following will
117: // return false (because the empty string is not a valid number):
118: // int number;
119: // pcrecpp::RE::FullMatch("abc", "[a-z]+(\\d+)?", &number);
120: //
121: // -----------------------------------------------------------------------
122: // DO_MATCH
123: //
124: // The matching interface supports at most 16 arguments per call.
125: // If you need more, consider using the more general interface
126: // pcrecpp::RE::DoMatch(). See pcrecpp.h for the signature for DoMatch.
127: //
128: // -----------------------------------------------------------------------
129: // PARTIAL MATCHES
130: //
131: // You can use the "PartialMatch" operation when you want the pattern
132: // to match any substring of the text.
133: //
134: // Example: simple search for a string:
135: // pcrecpp::RE("ell").PartialMatch("hello");
136: //
137: // Example: find first number in a string:
138: // int number;
139: // pcrecpp::RE re("(\\d+)");
140: // re.PartialMatch("x*100 + 20", &number);
141: // assert(number == 100);
142: //
143: // -----------------------------------------------------------------------
144: // UTF-8 AND THE MATCHING INTERFACE:
145: //
146: // By default, pattern and text are plain text, one byte per character.
147: // The UTF8 flag, passed to the constructor, causes both pattern
148: // and string to be treated as UTF-8 text, still a byte stream but
149: // potentially multiple bytes per character. In practice, the text
150: // is likelier to be UTF-8 than the pattern, but the match returned
151: // may depend on the UTF8 flag, so always use it when matching
152: // UTF8 text. E.g., "." will match one byte normally but with UTF8
153: // set may match up to three bytes of a multi-byte character.
154: //
155: // Example:
156: // pcrecpp::RE_Options options;
157: // options.set_utf8();
158: // pcrecpp::RE re(utf8_pattern, options);
159: // re.FullMatch(utf8_string);
160: //
161: // Example: using the convenience function UTF8():
162: // pcrecpp::RE re(utf8_pattern, pcrecpp::UTF8());
163: // re.FullMatch(utf8_string);
164: //
165: // NOTE: The UTF8 option is ignored if pcre was not configured with the
166: // --enable-utf8 flag.
167: //
168: // -----------------------------------------------------------------------
169: // PASSING MODIFIERS TO THE REGULAR EXPRESSION ENGINE
170: //
171: // PCRE defines some modifiers to change the behavior of the regular
172: // expression engine.
173: // The C++ wrapper defines an auxiliary class, RE_Options, as a vehicle
174: // to pass such modifiers to a RE class.
175: //
176: // Currently, the following modifiers are supported
177: //
178: // modifier description Perl corresponding
179: //
180: // PCRE_CASELESS case insensitive match /i
181: // PCRE_MULTILINE multiple lines match /m
182: // PCRE_DOTALL dot matches newlines /s
183: // PCRE_DOLLAR_ENDONLY $ matches only at end N/A
184: // PCRE_EXTRA strict escape parsing N/A
185: // PCRE_EXTENDED ignore whitespaces /x
186: // PCRE_UTF8 handles UTF8 chars built-in
187: // PCRE_UNGREEDY reverses * and *? N/A
188: // PCRE_NO_AUTO_CAPTURE disables matching parens N/A (*)
189: //
190: // (For a full account on how each modifier works, please check the
191: // PCRE API reference manual).
192: //
193: // (*) Both Perl and PCRE allow non matching parentheses by means of the
194: // "?:" modifier within the pattern itself. e.g. (?:ab|cd) does not
195: // capture, while (ab|cd) does.
196: //
197: // For each modifier, there are two member functions whose name is made
198: // out of the modifier in lowercase, without the "PCRE_" prefix. For
199: // instance, PCRE_CASELESS is handled by
200: // bool caseless(),
201: // which returns true if the modifier is set, and
202: // RE_Options & set_caseless(bool),
203: // which sets or unsets the modifier.
204: //
205: // Moreover, PCRE_EXTRA_MATCH_LIMIT can be accessed through the
206: // set_match_limit() and match_limit() member functions.
207: // Setting match_limit to a non-zero value will limit the executation of
208: // pcre to keep it from doing bad things like blowing the stack or taking
209: // an eternity to return a result. A value of 5000 is good enough to stop
210: // stack blowup in a 2MB thread stack. Setting match_limit to zero will
211: // disable match limiting. Alternately, you can set match_limit_recursion()
212: // which uses PCRE_EXTRA_MATCH_LIMIT_RECURSION to limit how much pcre
213: // recurses. match_limit() caps the number of matches pcre does;
214: // match_limit_recrusion() caps the depth of recursion.
215: //
216: // Normally, to pass one or more modifiers to a RE class, you declare
217: // a RE_Options object, set the appropriate options, and pass this
218: // object to a RE constructor. Example:
219: //
220: // RE_options opt;
221: // opt.set_caseless(true);
222: //
223: // if (RE("HELLO", opt).PartialMatch("hello world")) ...
224: //
225: // RE_options has two constructors. The default constructor takes no
226: // arguments and creates a set of flags that are off by default.
227: //
228: // The optional parameter 'option_flags' is to facilitate transfer
229: // of legacy code from C programs. This lets you do
230: // RE(pattern, RE_Options(PCRE_CASELESS|PCRE_MULTILINE)).PartialMatch(str);
231: //
232: // But new code is better off doing
233: // RE(pattern,
234: // RE_Options().set_caseless(true).set_multiline(true)).PartialMatch(str);
235: // (See below)
236: //
237: // If you are going to pass one of the most used modifiers, there are some
238: // convenience functions that return a RE_Options class with the
239: // appropriate modifier already set:
240: // CASELESS(), UTF8(), MULTILINE(), DOTALL(), EXTENDED()
241: //
242: // If you need to set several options at once, and you don't want to go
243: // through the pains of declaring a RE_Options object and setting several
244: // options, there is a parallel method that give you such ability on the
245: // fly. You can concatenate several set_xxxxx member functions, since each
246: // of them returns a reference to its class object. e.g.: to pass
247: // PCRE_CASELESS, PCRE_EXTENDED, and PCRE_MULTILINE to a RE with one
248: // statement, you may write
249: //
250: // RE(" ^ xyz \\s+ .* blah$", RE_Options()
251: // .set_caseless(true)
252: // .set_extended(true)
253: // .set_multiline(true)).PartialMatch(sometext);
254: //
255: // -----------------------------------------------------------------------
256: // SCANNING TEXT INCREMENTALLY
257: //
258: // The "Consume" operation may be useful if you want to repeatedly
259: // match regular expressions at the front of a string and skip over
260: // them as they match. This requires use of the "StringPiece" type,
261: // which represents a sub-range of a real string. Like RE, StringPiece
262: // is defined in the pcrecpp namespace.
263: //
264: // Example: read lines of the form "var = value" from a string.
265: // string contents = ...; // Fill string somehow
266: // pcrecpp::StringPiece input(contents); // Wrap in a StringPiece
267: //
268: // string var;
269: // int value;
270: // pcrecpp::RE re("(\\w+) = (\\d+)\n");
271: // while (re.Consume(&input, &var, &value)) {
272: // ...;
273: // }
274: //
275: // Each successful call to "Consume" will set "var/value", and also
276: // advance "input" so it points past the matched text.
277: //
278: // The "FindAndConsume" operation is similar to "Consume" but does not
279: // anchor your match at the beginning of the string. For example, you
280: // could extract all words from a string by repeatedly calling
281: // pcrecpp::RE("(\\w+)").FindAndConsume(&input, &word)
282: //
283: // -----------------------------------------------------------------------
284: // PARSING HEX/OCTAL/C-RADIX NUMBERS
285: //
286: // By default, if you pass a pointer to a numeric value, the
287: // corresponding text is interpreted as a base-10 number. You can
288: // instead wrap the pointer with a call to one of the operators Hex(),
289: // Octal(), or CRadix() to interpret the text in another base. The
290: // CRadix operator interprets C-style "0" (base-8) and "0x" (base-16)
291: // prefixes, but defaults to base-10.
292: //
293: // Example:
294: // int a, b, c, d;
295: // pcrecpp::RE re("(.*) (.*) (.*) (.*)");
296: // re.FullMatch("100 40 0100 0x40",
297: // pcrecpp::Octal(&a), pcrecpp::Hex(&b),
298: // pcrecpp::CRadix(&c), pcrecpp::CRadix(&d));
299: // will leave 64 in a, b, c, and d.
300: //
301: // -----------------------------------------------------------------------
302: // REPLACING PARTS OF STRINGS
303: //
304: // You can replace the first match of "pattern" in "str" with
305: // "rewrite". Within "rewrite", backslash-escaped digits (\1 to \9)
306: // can be used to insert text matching corresponding parenthesized
307: // group from the pattern. \0 in "rewrite" refers to the entire
308: // matching text. E.g.,
309: //
310: // string s = "yabba dabba doo";
311: // pcrecpp::RE("b+").Replace("d", &s);
312: //
313: // will leave "s" containing "yada dabba doo". The result is true if
314: // the pattern matches and a replacement occurs, or false otherwise.
315: //
316: // GlobalReplace() is like Replace(), except that it replaces all
317: // occurrences of the pattern in the string with the rewrite.
318: // Replacements are not subject to re-matching. E.g.,
319: //
320: // string s = "yabba dabba doo";
321: // pcrecpp::RE("b+").GlobalReplace("d", &s);
322: //
323: // will leave "s" containing "yada dada doo". It returns the number
324: // of replacements made.
325: //
326: // Extract() is like Replace(), except that if the pattern matches,
327: // "rewrite" is copied into "out" (an additional argument) with
328: // substitutions. The non-matching portions of "text" are ignored.
329: // Returns true iff a match occurred and the extraction happened
330: // successfully. If no match occurs, the string is left unaffected.
331:
332:
333: #include <string>
334: #include <pcre.h>
335: #include <pcrecpparg.h> // defines the Arg class
336: // This isn't technically needed here, but we include it
337: // anyway so folks who include pcrecpp.h don't have to.
338: #include <pcre_stringpiece.h>
339:
340: namespace pcrecpp {
341:
342: #define PCRE_SET_OR_CLEAR(b, o) \
343: if (b) all_options_ |= (o); else all_options_ &= ~(o); \
344: return *this
345:
346: #define PCRE_IS_SET(o) \
347: (all_options_ & o) == o
348:
349: /***** Compiling regular expressions: the RE class *****/
350:
351: // RE_Options allow you to set options to be passed along to pcre,
352: // along with other options we put on top of pcre.
353: // Only 9 modifiers, plus match_limit and match_limit_recursion,
354: // are supported now.
355: class PCRECPP_EXP_DEFN RE_Options {
356: public:
357: // constructor
358: RE_Options() : match_limit_(0), match_limit_recursion_(0), all_options_(0) {}
359:
360: // alternative constructor.
361: // To facilitate transfer of legacy code from C programs
362: //
363: // This lets you do
364: // RE(pattern, RE_Options(PCRE_CASELESS|PCRE_MULTILINE)).PartialMatch(str);
365: // But new code is better off doing
366: // RE(pattern,
367: // RE_Options().set_caseless(true).set_multiline(true)).PartialMatch(str);
368: RE_Options(int option_flags) : match_limit_(0), match_limit_recursion_(0),
369: all_options_(option_flags) {}
370: // we're fine with the default destructor, copy constructor, etc.
371:
372: // accessors and mutators
373: int match_limit() const { return match_limit_; };
374: RE_Options &set_match_limit(int limit) {
375: match_limit_ = limit;
376: return *this;
377: }
378:
379: int match_limit_recursion() const { return match_limit_recursion_; };
380: RE_Options &set_match_limit_recursion(int limit) {
381: match_limit_recursion_ = limit;
382: return *this;
383: }
384:
385: bool caseless() const {
386: return PCRE_IS_SET(PCRE_CASELESS);
387: }
388: RE_Options &set_caseless(bool x) {
389: PCRE_SET_OR_CLEAR(x, PCRE_CASELESS);
390: }
391:
392: bool multiline() const {
393: return PCRE_IS_SET(PCRE_MULTILINE);
394: }
395: RE_Options &set_multiline(bool x) {
396: PCRE_SET_OR_CLEAR(x, PCRE_MULTILINE);
397: }
398:
399: bool dotall() const {
400: return PCRE_IS_SET(PCRE_DOTALL);
401: }
402: RE_Options &set_dotall(bool x) {
403: PCRE_SET_OR_CLEAR(x, PCRE_DOTALL);
404: }
405:
406: bool extended() const {
407: return PCRE_IS_SET(PCRE_EXTENDED);
408: }
409: RE_Options &set_extended(bool x) {
410: PCRE_SET_OR_CLEAR(x, PCRE_EXTENDED);
411: }
412:
413: bool dollar_endonly() const {
414: return PCRE_IS_SET(PCRE_DOLLAR_ENDONLY);
415: }
416: RE_Options &set_dollar_endonly(bool x) {
417: PCRE_SET_OR_CLEAR(x, PCRE_DOLLAR_ENDONLY);
418: }
419:
420: bool extra() const {
421: return PCRE_IS_SET(PCRE_EXTRA);
422: }
423: RE_Options &set_extra(bool x) {
424: PCRE_SET_OR_CLEAR(x, PCRE_EXTRA);
425: }
426:
427: bool ungreedy() const {
428: return PCRE_IS_SET(PCRE_UNGREEDY);
429: }
430: RE_Options &set_ungreedy(bool x) {
431: PCRE_SET_OR_CLEAR(x, PCRE_UNGREEDY);
432: }
433:
434: bool utf8() const {
435: return PCRE_IS_SET(PCRE_UTF8);
436: }
437: RE_Options &set_utf8(bool x) {
438: PCRE_SET_OR_CLEAR(x, PCRE_UTF8);
439: }
440:
441: bool no_auto_capture() const {
442: return PCRE_IS_SET(PCRE_NO_AUTO_CAPTURE);
443: }
444: RE_Options &set_no_auto_capture(bool x) {
445: PCRE_SET_OR_CLEAR(x, PCRE_NO_AUTO_CAPTURE);
446: }
447:
448: RE_Options &set_all_options(int opt) {
449: all_options_ = opt;
450: return *this;
451: }
452: int all_options() const {
453: return all_options_ ;
454: }
455:
456: // TODO: add other pcre flags
457:
458: private:
459: int match_limit_;
460: int match_limit_recursion_;
461: int all_options_;
462: };
463:
464: // These functions return some common RE_Options
465: static inline RE_Options UTF8() {
466: return RE_Options().set_utf8(true);
467: }
468:
469: static inline RE_Options CASELESS() {
470: return RE_Options().set_caseless(true);
471: }
472: static inline RE_Options MULTILINE() {
473: return RE_Options().set_multiline(true);
474: }
475:
476: static inline RE_Options DOTALL() {
477: return RE_Options().set_dotall(true);
478: }
479:
480: static inline RE_Options EXTENDED() {
481: return RE_Options().set_extended(true);
482: }
483:
484: // Interface for regular expression matching. Also corresponds to a
485: // pre-compiled regular expression. An "RE" object is safe for
486: // concurrent use by multiple threads.
487: class PCRECPP_EXP_DEFN RE {
488: public:
489: // We provide implicit conversions from strings so that users can
490: // pass in a string or a "const char*" wherever an "RE" is expected.
491: RE(const string& pat) { Init(pat, NULL); }
492: RE(const string& pat, const RE_Options& option) { Init(pat, &option); }
493: RE(const char* pat) { Init(pat, NULL); }
494: RE(const char* pat, const RE_Options& option) { Init(pat, &option); }
495: RE(const unsigned char* pat) {
496: Init(reinterpret_cast<const char*>(pat), NULL);
497: }
498: RE(const unsigned char* pat, const RE_Options& option) {
499: Init(reinterpret_cast<const char*>(pat), &option);
500: }
501:
502: // Copy constructor & assignment - note that these are expensive
503: // because they recompile the expression.
504: RE(const RE& re) { Init(re.pattern_, &re.options_); }
505: const RE& operator=(const RE& re) {
506: if (this != &re) {
507: Cleanup();
508:
509: // This is the code that originally came from Google
510: // Init(re.pattern_.c_str(), &re.options_);
511:
512: // This is the replacement from Ari Pollak
513: Init(re.pattern_, &re.options_);
514: }
515: return *this;
516: }
517:
518:
519: ~RE();
520:
521: // The string specification for this RE. E.g.
522: // RE re("ab*c?d+");
523: // re.pattern(); // "ab*c?d+"
524: const string& pattern() const { return pattern_; }
525:
526: // If RE could not be created properly, returns an error string.
527: // Else returns the empty string.
528: const string& error() const { return *error_; }
529:
530: /***** The useful part: the matching interface *****/
531:
532: // This is provided so one can do pattern.ReplaceAll() just as
533: // easily as ReplaceAll(pattern-text, ....)
534:
535: bool FullMatch(const StringPiece& text,
536: const Arg& ptr1 = no_arg,
537: const Arg& ptr2 = no_arg,
538: const Arg& ptr3 = no_arg,
539: const Arg& ptr4 = no_arg,
540: const Arg& ptr5 = no_arg,
541: const Arg& ptr6 = no_arg,
542: const Arg& ptr7 = no_arg,
543: const Arg& ptr8 = no_arg,
544: const Arg& ptr9 = no_arg,
545: const Arg& ptr10 = no_arg,
546: const Arg& ptr11 = no_arg,
547: const Arg& ptr12 = no_arg,
548: const Arg& ptr13 = no_arg,
549: const Arg& ptr14 = no_arg,
550: const Arg& ptr15 = no_arg,
551: const Arg& ptr16 = no_arg) const;
552:
553: bool PartialMatch(const StringPiece& text,
554: const Arg& ptr1 = no_arg,
555: const Arg& ptr2 = no_arg,
556: const Arg& ptr3 = no_arg,
557: const Arg& ptr4 = no_arg,
558: const Arg& ptr5 = no_arg,
559: const Arg& ptr6 = no_arg,
560: const Arg& ptr7 = no_arg,
561: const Arg& ptr8 = no_arg,
562: const Arg& ptr9 = no_arg,
563: const Arg& ptr10 = no_arg,
564: const Arg& ptr11 = no_arg,
565: const Arg& ptr12 = no_arg,
566: const Arg& ptr13 = no_arg,
567: const Arg& ptr14 = no_arg,
568: const Arg& ptr15 = no_arg,
569: const Arg& ptr16 = no_arg) const;
570:
571: bool Consume(StringPiece* input,
572: const Arg& ptr1 = no_arg,
573: const Arg& ptr2 = no_arg,
574: const Arg& ptr3 = no_arg,
575: const Arg& ptr4 = no_arg,
576: const Arg& ptr5 = no_arg,
577: const Arg& ptr6 = no_arg,
578: const Arg& ptr7 = no_arg,
579: const Arg& ptr8 = no_arg,
580: const Arg& ptr9 = no_arg,
581: const Arg& ptr10 = no_arg,
582: const Arg& ptr11 = no_arg,
583: const Arg& ptr12 = no_arg,
584: const Arg& ptr13 = no_arg,
585: const Arg& ptr14 = no_arg,
586: const Arg& ptr15 = no_arg,
587: const Arg& ptr16 = no_arg) const;
588:
589: bool FindAndConsume(StringPiece* input,
590: const Arg& ptr1 = no_arg,
591: const Arg& ptr2 = no_arg,
592: const Arg& ptr3 = no_arg,
593: const Arg& ptr4 = no_arg,
594: const Arg& ptr5 = no_arg,
595: const Arg& ptr6 = no_arg,
596: const Arg& ptr7 = no_arg,
597: const Arg& ptr8 = no_arg,
598: const Arg& ptr9 = no_arg,
599: const Arg& ptr10 = no_arg,
600: const Arg& ptr11 = no_arg,
601: const Arg& ptr12 = no_arg,
602: const Arg& ptr13 = no_arg,
603: const Arg& ptr14 = no_arg,
604: const Arg& ptr15 = no_arg,
605: const Arg& ptr16 = no_arg) const;
606:
607: bool Replace(const StringPiece& rewrite,
608: string *str) const;
609:
610: int GlobalReplace(const StringPiece& rewrite,
611: string *str) const;
612:
613: bool Extract(const StringPiece &rewrite,
614: const StringPiece &text,
615: string *out) const;
616:
617: // Escapes all potentially meaningful regexp characters in
618: // 'unquoted'. The returned string, used as a regular expression,
619: // will exactly match the original string. For example,
620: // 1.5-2.0?
621: // may become:
622: // 1\.5\-2\.0\?
623: // Note QuoteMeta behaves the same as perl's QuoteMeta function,
624: // *except* that it escapes the NUL character (\0) as backslash + 0,
625: // rather than backslash + NUL.
626: static string QuoteMeta(const StringPiece& unquoted);
627:
628:
629: /***** Generic matching interface *****/
630:
631: // Type of match (TODO: Should be restructured as part of RE_Options)
632: enum Anchor {
633: UNANCHORED, // No anchoring
634: ANCHOR_START, // Anchor at start only
635: ANCHOR_BOTH // Anchor at start and end
636: };
637:
638: // General matching routine. Stores the length of the match in
639: // "*consumed" if successful.
640: bool DoMatch(const StringPiece& text,
641: Anchor anchor,
642: int* consumed,
643: const Arg* const* args, int n) const;
644:
645: // Return the number of capturing subpatterns, or -1 if the
646: // regexp wasn't valid on construction.
647: int NumberOfCapturingGroups() const;
648:
649: // The default value for an argument, to indicate the end of the argument
650: // list. This must be used only in optional argument defaults. It should NOT
651: // be passed explicitly. Some people have tried to use it like this:
652: //
653: // FullMatch(x, y, &z, no_arg, &w);
654: //
655: // This is a mistake, and will not work.
656: static Arg no_arg;
657:
658: private:
659:
660: void Init(const string& pattern, const RE_Options* options);
661: void Cleanup();
662:
663: // Match against "text", filling in "vec" (up to "vecsize" * 2/3) with
664: // pairs of integers for the beginning and end positions of matched
665: // text. The first pair corresponds to the entire matched text;
666: // subsequent pairs correspond, in order, to parentheses-captured
667: // matches. Returns the number of pairs (one more than the number of
668: // the last subpattern with a match) if matching was successful
669: // and zero if the match failed.
670: // I.e. for RE("(foo)|(bar)|(baz)") it will return 2, 3, and 4 when matching
671: // against "foo", "bar", and "baz" respectively.
672: // When matching RE("(foo)|hello") against "hello", it will return 1.
673: // But the values for all subpattern are filled in into "vec".
674: int TryMatch(const StringPiece& text,
675: int startpos,
676: Anchor anchor,
677: bool empty_ok,
678: int *vec,
679: int vecsize) const;
680:
681: // Append the "rewrite" string, with backslash subsitutions from "text"
682: // and "vec", to string "out".
683: bool Rewrite(string *out,
684: const StringPiece& rewrite,
685: const StringPiece& text,
686: int *vec,
687: int veclen) const;
688:
689: // internal implementation for DoMatch
690: bool DoMatchImpl(const StringPiece& text,
691: Anchor anchor,
692: int* consumed,
693: const Arg* const args[],
694: int n,
695: int* vec,
696: int vecsize) const;
697:
698: // Compile the regexp for the specified anchoring mode
699: pcre* Compile(Anchor anchor);
700:
701: string pattern_;
702: RE_Options options_;
703: pcre* re_full_; // For full matches
704: pcre* re_partial_; // For partial matches
705: const string* error_; // Error indicator (or points to empty string)
706: };
707:
708: } // namespace pcrecpp
709:
710: #endif /* _PCRECPP_H */
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