Annotation of embedaddon/pcre/pcrecpp.cc, revision 1.1.1.2
1.1 misho 1: // Copyright (c) 2010, 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.
14: // * Neither the name of Google Inc. nor the names of its
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
27: // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28: // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29: //
30: // Author: Sanjay Ghemawat
31:
32: #ifdef HAVE_CONFIG_H
33: #include "config.h"
34: #endif
35:
36: #include <stdlib.h>
37: #include <stdio.h>
38: #include <ctype.h>
39: #include <limits.h> /* for SHRT_MIN, USHRT_MAX, etc */
40: #include <string.h> /* for memcpy */
41: #include <assert.h>
42: #include <errno.h>
43: #include <string>
44: #include <algorithm>
45:
46: #include "pcrecpp_internal.h"
47: #include "pcre.h"
48: #include "pcrecpp.h"
49: #include "pcre_stringpiece.h"
50:
51:
52: namespace pcrecpp {
53:
54: // Maximum number of args we can set
55: static const int kMaxArgs = 16;
56: static const int kVecSize = (1 + kMaxArgs) * 3; // results + PCRE workspace
57:
58: // Special object that stands-in for no argument
59: Arg RE::no_arg((void*)NULL);
60:
61: // This is for ABI compatibility with old versions of pcre (pre-7.6),
62: // which defined a global no_arg variable instead of putting it in the
63: // RE class. This works on GCC >= 3, at least. It definitely works
64: // for ELF, but may not for other object formats (Mach-O, for
65: // instance, does not support aliases.) We could probably have a more
66: // inclusive test if we ever needed it. (Note that not only the
67: // __attribute__ syntax, but also __USER_LABEL_PREFIX__, are
68: // gnu-specific.)
69: #if defined(__GNUC__) && __GNUC__ >= 3 && defined(__ELF__)
70: # define ULP_AS_STRING(x) ULP_AS_STRING_INTERNAL(x)
71: # define ULP_AS_STRING_INTERNAL(x) #x
72: # define USER_LABEL_PREFIX_STR ULP_AS_STRING(__USER_LABEL_PREFIX__)
73: extern Arg no_arg
74: __attribute__((alias(USER_LABEL_PREFIX_STR "_ZN7pcrecpp2RE6no_argE")));
75: #endif
76:
77: // If a regular expression has no error, its error_ field points here
78: static const string empty_string;
79:
80: // If the user doesn't ask for any options, we just use this one
81: static RE_Options default_options;
82:
83: void RE::Init(const string& pat, const RE_Options* options) {
84: pattern_ = pat;
85: if (options == NULL) {
86: options_ = default_options;
87: } else {
88: options_ = *options;
89: }
90: error_ = &empty_string;
91: re_full_ = NULL;
92: re_partial_ = NULL;
93:
94: re_partial_ = Compile(UNANCHORED);
95: if (re_partial_ != NULL) {
96: re_full_ = Compile(ANCHOR_BOTH);
97: }
98: }
99:
100: void RE::Cleanup() {
101: if (re_full_ != NULL) (*pcre_free)(re_full_);
102: if (re_partial_ != NULL) (*pcre_free)(re_partial_);
103: if (error_ != &empty_string) delete error_;
104: }
105:
106:
107: RE::~RE() {
108: Cleanup();
109: }
110:
111:
112: pcre* RE::Compile(Anchor anchor) {
113: // First, convert RE_Options into pcre options
114: int pcre_options = 0;
115: pcre_options = options_.all_options();
116:
117: // Special treatment for anchoring. This is needed because at
118: // runtime pcre only provides an option for anchoring at the
119: // beginning of a string (unless you use offset).
120: //
121: // There are three types of anchoring we want:
122: // UNANCHORED Compile the original pattern, and use
123: // a pcre unanchored match.
124: // ANCHOR_START Compile the original pattern, and use
125: // a pcre anchored match.
126: // ANCHOR_BOTH Tack a "\z" to the end of the original pattern
127: // and use a pcre anchored match.
128:
129: const char* compile_error;
130: int eoffset;
131: pcre* re;
132: if (anchor != ANCHOR_BOTH) {
133: re = pcre_compile(pattern_.c_str(), pcre_options,
134: &compile_error, &eoffset, NULL);
135: } else {
136: // Tack a '\z' at the end of RE. Parenthesize it first so that
137: // the '\z' applies to all top-level alternatives in the regexp.
138: string wrapped = "(?:"; // A non-counting grouping operator
139: wrapped += pattern_;
140: wrapped += ")\\z";
141: re = pcre_compile(wrapped.c_str(), pcre_options,
142: &compile_error, &eoffset, NULL);
143: }
144: if (re == NULL) {
145: if (error_ == &empty_string) error_ = new string(compile_error);
146: }
147: return re;
148: }
149:
150: /***** Matching interfaces *****/
151:
152: bool RE::FullMatch(const StringPiece& text,
153: const Arg& ptr1,
154: const Arg& ptr2,
155: const Arg& ptr3,
156: const Arg& ptr4,
157: const Arg& ptr5,
158: const Arg& ptr6,
159: const Arg& ptr7,
160: const Arg& ptr8,
161: const Arg& ptr9,
162: const Arg& ptr10,
163: const Arg& ptr11,
164: const Arg& ptr12,
165: const Arg& ptr13,
166: const Arg& ptr14,
167: const Arg& ptr15,
168: const Arg& ptr16) const {
169: const Arg* args[kMaxArgs];
170: int n = 0;
171: if (&ptr1 == &no_arg) goto done; args[n++] = &ptr1;
172: if (&ptr2 == &no_arg) goto done; args[n++] = &ptr2;
173: if (&ptr3 == &no_arg) goto done; args[n++] = &ptr3;
174: if (&ptr4 == &no_arg) goto done; args[n++] = &ptr4;
175: if (&ptr5 == &no_arg) goto done; args[n++] = &ptr5;
176: if (&ptr6 == &no_arg) goto done; args[n++] = &ptr6;
177: if (&ptr7 == &no_arg) goto done; args[n++] = &ptr7;
178: if (&ptr8 == &no_arg) goto done; args[n++] = &ptr8;
179: if (&ptr9 == &no_arg) goto done; args[n++] = &ptr9;
180: if (&ptr10 == &no_arg) goto done; args[n++] = &ptr10;
181: if (&ptr11 == &no_arg) goto done; args[n++] = &ptr11;
182: if (&ptr12 == &no_arg) goto done; args[n++] = &ptr12;
183: if (&ptr13 == &no_arg) goto done; args[n++] = &ptr13;
184: if (&ptr14 == &no_arg) goto done; args[n++] = &ptr14;
185: if (&ptr15 == &no_arg) goto done; args[n++] = &ptr15;
186: if (&ptr16 == &no_arg) goto done; args[n++] = &ptr16;
187: done:
188:
189: int consumed;
190: int vec[kVecSize];
191: return DoMatchImpl(text, ANCHOR_BOTH, &consumed, args, n, vec, kVecSize);
192: }
193:
194: bool RE::PartialMatch(const StringPiece& text,
195: const Arg& ptr1,
196: const Arg& ptr2,
197: const Arg& ptr3,
198: const Arg& ptr4,
199: const Arg& ptr5,
200: const Arg& ptr6,
201: const Arg& ptr7,
202: const Arg& ptr8,
203: const Arg& ptr9,
204: const Arg& ptr10,
205: const Arg& ptr11,
206: const Arg& ptr12,
207: const Arg& ptr13,
208: const Arg& ptr14,
209: const Arg& ptr15,
210: const Arg& ptr16) const {
211: const Arg* args[kMaxArgs];
212: int n = 0;
213: if (&ptr1 == &no_arg) goto done; args[n++] = &ptr1;
214: if (&ptr2 == &no_arg) goto done; args[n++] = &ptr2;
215: if (&ptr3 == &no_arg) goto done; args[n++] = &ptr3;
216: if (&ptr4 == &no_arg) goto done; args[n++] = &ptr4;
217: if (&ptr5 == &no_arg) goto done; args[n++] = &ptr5;
218: if (&ptr6 == &no_arg) goto done; args[n++] = &ptr6;
219: if (&ptr7 == &no_arg) goto done; args[n++] = &ptr7;
220: if (&ptr8 == &no_arg) goto done; args[n++] = &ptr8;
221: if (&ptr9 == &no_arg) goto done; args[n++] = &ptr9;
222: if (&ptr10 == &no_arg) goto done; args[n++] = &ptr10;
223: if (&ptr11 == &no_arg) goto done; args[n++] = &ptr11;
224: if (&ptr12 == &no_arg) goto done; args[n++] = &ptr12;
225: if (&ptr13 == &no_arg) goto done; args[n++] = &ptr13;
226: if (&ptr14 == &no_arg) goto done; args[n++] = &ptr14;
227: if (&ptr15 == &no_arg) goto done; args[n++] = &ptr15;
228: if (&ptr16 == &no_arg) goto done; args[n++] = &ptr16;
229: done:
230:
231: int consumed;
232: int vec[kVecSize];
233: return DoMatchImpl(text, UNANCHORED, &consumed, args, n, vec, kVecSize);
234: }
235:
236: bool RE::Consume(StringPiece* input,
237: const Arg& ptr1,
238: const Arg& ptr2,
239: const Arg& ptr3,
240: const Arg& ptr4,
241: const Arg& ptr5,
242: const Arg& ptr6,
243: const Arg& ptr7,
244: const Arg& ptr8,
245: const Arg& ptr9,
246: const Arg& ptr10,
247: const Arg& ptr11,
248: const Arg& ptr12,
249: const Arg& ptr13,
250: const Arg& ptr14,
251: const Arg& ptr15,
252: const Arg& ptr16) const {
253: const Arg* args[kMaxArgs];
254: int n = 0;
255: if (&ptr1 == &no_arg) goto done; args[n++] = &ptr1;
256: if (&ptr2 == &no_arg) goto done; args[n++] = &ptr2;
257: if (&ptr3 == &no_arg) goto done; args[n++] = &ptr3;
258: if (&ptr4 == &no_arg) goto done; args[n++] = &ptr4;
259: if (&ptr5 == &no_arg) goto done; args[n++] = &ptr5;
260: if (&ptr6 == &no_arg) goto done; args[n++] = &ptr6;
261: if (&ptr7 == &no_arg) goto done; args[n++] = &ptr7;
262: if (&ptr8 == &no_arg) goto done; args[n++] = &ptr8;
263: if (&ptr9 == &no_arg) goto done; args[n++] = &ptr9;
264: if (&ptr10 == &no_arg) goto done; args[n++] = &ptr10;
265: if (&ptr11 == &no_arg) goto done; args[n++] = &ptr11;
266: if (&ptr12 == &no_arg) goto done; args[n++] = &ptr12;
267: if (&ptr13 == &no_arg) goto done; args[n++] = &ptr13;
268: if (&ptr14 == &no_arg) goto done; args[n++] = &ptr14;
269: if (&ptr15 == &no_arg) goto done; args[n++] = &ptr15;
270: if (&ptr16 == &no_arg) goto done; args[n++] = &ptr16;
271: done:
272:
273: int consumed;
274: int vec[kVecSize];
275: if (DoMatchImpl(*input, ANCHOR_START, &consumed,
276: args, n, vec, kVecSize)) {
277: input->remove_prefix(consumed);
278: return true;
279: } else {
280: return false;
281: }
282: }
283:
284: bool RE::FindAndConsume(StringPiece* input,
285: const Arg& ptr1,
286: const Arg& ptr2,
287: const Arg& ptr3,
288: const Arg& ptr4,
289: const Arg& ptr5,
290: const Arg& ptr6,
291: const Arg& ptr7,
292: const Arg& ptr8,
293: const Arg& ptr9,
294: const Arg& ptr10,
295: const Arg& ptr11,
296: const Arg& ptr12,
297: const Arg& ptr13,
298: const Arg& ptr14,
299: const Arg& ptr15,
300: const Arg& ptr16) const {
301: const Arg* args[kMaxArgs];
302: int n = 0;
303: if (&ptr1 == &no_arg) goto done; args[n++] = &ptr1;
304: if (&ptr2 == &no_arg) goto done; args[n++] = &ptr2;
305: if (&ptr3 == &no_arg) goto done; args[n++] = &ptr3;
306: if (&ptr4 == &no_arg) goto done; args[n++] = &ptr4;
307: if (&ptr5 == &no_arg) goto done; args[n++] = &ptr5;
308: if (&ptr6 == &no_arg) goto done; args[n++] = &ptr6;
309: if (&ptr7 == &no_arg) goto done; args[n++] = &ptr7;
310: if (&ptr8 == &no_arg) goto done; args[n++] = &ptr8;
311: if (&ptr9 == &no_arg) goto done; args[n++] = &ptr9;
312: if (&ptr10 == &no_arg) goto done; args[n++] = &ptr10;
313: if (&ptr11 == &no_arg) goto done; args[n++] = &ptr11;
314: if (&ptr12 == &no_arg) goto done; args[n++] = &ptr12;
315: if (&ptr13 == &no_arg) goto done; args[n++] = &ptr13;
316: if (&ptr14 == &no_arg) goto done; args[n++] = &ptr14;
317: if (&ptr15 == &no_arg) goto done; args[n++] = &ptr15;
318: if (&ptr16 == &no_arg) goto done; args[n++] = &ptr16;
319: done:
320:
321: int consumed;
322: int vec[kVecSize];
323: if (DoMatchImpl(*input, UNANCHORED, &consumed,
324: args, n, vec, kVecSize)) {
325: input->remove_prefix(consumed);
326: return true;
327: } else {
328: return false;
329: }
330: }
331:
332: bool RE::Replace(const StringPiece& rewrite,
333: string *str) const {
334: int vec[kVecSize];
335: int matches = TryMatch(*str, 0, UNANCHORED, true, vec, kVecSize);
336: if (matches == 0)
337: return false;
338:
339: string s;
340: if (!Rewrite(&s, rewrite, *str, vec, matches))
341: return false;
342:
343: assert(vec[0] >= 0);
344: assert(vec[1] >= 0);
345: str->replace(vec[0], vec[1] - vec[0], s);
346: return true;
347: }
348:
349: // Returns PCRE_NEWLINE_CRLF, PCRE_NEWLINE_CR, or PCRE_NEWLINE_LF.
350: // Note that PCRE_NEWLINE_CRLF is defined to be P_N_CR | P_N_LF.
351: // Modified by PH to add PCRE_NEWLINE_ANY and PCRE_NEWLINE_ANYCRLF.
352:
353: static int NewlineMode(int pcre_options) {
354: // TODO: if we can make it threadsafe, cache this var
355: int newline_mode = 0;
356: /* if (newline_mode) return newline_mode; */ // do this once it's cached
357: if (pcre_options & (PCRE_NEWLINE_CRLF|PCRE_NEWLINE_CR|PCRE_NEWLINE_LF|
358: PCRE_NEWLINE_ANY|PCRE_NEWLINE_ANYCRLF)) {
359: newline_mode = (pcre_options &
360: (PCRE_NEWLINE_CRLF|PCRE_NEWLINE_CR|PCRE_NEWLINE_LF|
361: PCRE_NEWLINE_ANY|PCRE_NEWLINE_ANYCRLF));
362: } else {
363: int newline;
364: pcre_config(PCRE_CONFIG_NEWLINE, &newline);
365: if (newline == 10)
366: newline_mode = PCRE_NEWLINE_LF;
367: else if (newline == 13)
368: newline_mode = PCRE_NEWLINE_CR;
369: else if (newline == 3338)
370: newline_mode = PCRE_NEWLINE_CRLF;
371: else if (newline == -1)
372: newline_mode = PCRE_NEWLINE_ANY;
373: else if (newline == -2)
374: newline_mode = PCRE_NEWLINE_ANYCRLF;
375: else
376: assert(NULL == "Unexpected return value from pcre_config(NEWLINE)");
377: }
378: return newline_mode;
379: }
380:
381: int RE::GlobalReplace(const StringPiece& rewrite,
382: string *str) const {
383: int count = 0;
384: int vec[kVecSize];
385: string out;
386: int start = 0;
387: bool last_match_was_empty_string = false;
388:
389: while (start <= static_cast<int>(str->length())) {
390: // If the previous match was for the empty string, we shouldn't
391: // just match again: we'll match in the same way and get an
392: // infinite loop. Instead, we do the match in a special way:
393: // anchored -- to force another try at the same position --
394: // and with a flag saying that this time, ignore empty matches.
395: // If this special match returns, that means there's a non-empty
396: // match at this position as well, and we can continue. If not,
397: // we do what perl does, and just advance by one.
398: // Notice that perl prints '@@@' for this;
399: // perl -le '$_ = "aa"; s/b*|aa/@/g; print'
400: int matches;
401: if (last_match_was_empty_string) {
402: matches = TryMatch(*str, start, ANCHOR_START, false, vec, kVecSize);
403: if (matches <= 0) {
404: int matchend = start + 1; // advance one character.
405: // If the current char is CR and we're in CRLF mode, skip LF too.
406: // Note it's better to call pcre_fullinfo() than to examine
407: // all_options(), since options_ could have changed bewteen
408: // compile-time and now, but this is simpler and safe enough.
409: // Modified by PH to add ANY and ANYCRLF.
410: if (matchend < static_cast<int>(str->length()) &&
411: (*str)[start] == '\r' && (*str)[matchend] == '\n' &&
412: (NewlineMode(options_.all_options()) == PCRE_NEWLINE_CRLF ||
413: NewlineMode(options_.all_options()) == PCRE_NEWLINE_ANY ||
414: NewlineMode(options_.all_options()) == PCRE_NEWLINE_ANYCRLF)) {
415: matchend++;
416: }
417: // We also need to advance more than one char if we're in utf8 mode.
418: #ifdef SUPPORT_UTF8
419: if (options_.utf8()) {
420: while (matchend < static_cast<int>(str->length()) &&
421: ((*str)[matchend] & 0xc0) == 0x80)
422: matchend++;
423: }
424: #endif
425: if (start < static_cast<int>(str->length()))
426: out.append(*str, start, matchend - start);
427: start = matchend;
428: last_match_was_empty_string = false;
429: continue;
430: }
431: } else {
432: matches = TryMatch(*str, start, UNANCHORED, true, vec, kVecSize);
433: if (matches <= 0)
434: break;
435: }
436: int matchstart = vec[0], matchend = vec[1];
437: assert(matchstart >= start);
438: assert(matchend >= matchstart);
439: out.append(*str, start, matchstart - start);
440: Rewrite(&out, rewrite, *str, vec, matches);
441: start = matchend;
442: count++;
443: last_match_was_empty_string = (matchstart == matchend);
444: }
445:
446: if (count == 0)
447: return 0;
448:
449: if (start < static_cast<int>(str->length()))
450: out.append(*str, start, str->length() - start);
451: swap(out, *str);
452: return count;
453: }
454:
455: bool RE::Extract(const StringPiece& rewrite,
456: const StringPiece& text,
457: string *out) const {
458: int vec[kVecSize];
459: int matches = TryMatch(text, 0, UNANCHORED, true, vec, kVecSize);
460: if (matches == 0)
461: return false;
462: out->erase();
463: return Rewrite(out, rewrite, text, vec, matches);
464: }
465:
466: /*static*/ string RE::QuoteMeta(const StringPiece& unquoted) {
467: string result;
468:
469: // Escape any ascii character not in [A-Za-z_0-9].
470: //
471: // Note that it's legal to escape a character even if it has no
472: // special meaning in a regular expression -- so this function does
473: // that. (This also makes it identical to the perl function of the
474: // same name; see `perldoc -f quotemeta`.) The one exception is
475: // escaping NUL: rather than doing backslash + NUL, like perl does,
476: // we do '\0', because pcre itself doesn't take embedded NUL chars.
477: for (int ii = 0; ii < unquoted.size(); ++ii) {
478: // Note that using 'isalnum' here raises the benchmark time from
479: // 32ns to 58ns:
480: if (unquoted[ii] == '\0') {
481: result += "\\0";
482: } else if ((unquoted[ii] < 'a' || unquoted[ii] > 'z') &&
483: (unquoted[ii] < 'A' || unquoted[ii] > 'Z') &&
484: (unquoted[ii] < '0' || unquoted[ii] > '9') &&
485: unquoted[ii] != '_' &&
486: // If this is the part of a UTF8 or Latin1 character, we need
487: // to copy this byte without escaping. Experimentally this is
488: // what works correctly with the regexp library.
489: !(unquoted[ii] & 128)) {
490: result += '\\';
491: result += unquoted[ii];
492: } else {
493: result += unquoted[ii];
494: }
495: }
496:
497: return result;
498: }
499:
500: /***** Actual matching and rewriting code *****/
501:
502: int RE::TryMatch(const StringPiece& text,
503: int startpos,
504: Anchor anchor,
505: bool empty_ok,
506: int *vec,
507: int vecsize) const {
508: pcre* re = (anchor == ANCHOR_BOTH) ? re_full_ : re_partial_;
509: if (re == NULL) {
510: //fprintf(stderr, "Matching against invalid re: %s\n", error_->c_str());
511: return 0;
512: }
513:
514: pcre_extra extra = { 0, 0, 0, 0, 0, 0 };
515: if (options_.match_limit() > 0) {
516: extra.flags |= PCRE_EXTRA_MATCH_LIMIT;
517: extra.match_limit = options_.match_limit();
518: }
519: if (options_.match_limit_recursion() > 0) {
520: extra.flags |= PCRE_EXTRA_MATCH_LIMIT_RECURSION;
521: extra.match_limit_recursion = options_.match_limit_recursion();
522: }
523:
524: int options = 0;
525: if (anchor != UNANCHORED)
526: options |= PCRE_ANCHORED;
527: if (!empty_ok)
528: options |= PCRE_NOTEMPTY;
529:
530: int rc = pcre_exec(re, // The regular expression object
531: &extra,
532: (text.data() == NULL) ? "" : text.data(),
533: text.size(),
534: startpos,
535: options,
536: vec,
537: vecsize);
538:
539: // Handle errors
540: if (rc == PCRE_ERROR_NOMATCH) {
541: return 0;
542: } else if (rc < 0) {
543: //fprintf(stderr, "Unexpected return code: %d when matching '%s'\n",
544: // re, pattern_.c_str());
545: return 0;
546: } else if (rc == 0) {
547: // pcre_exec() returns 0 as a special case when the number of
548: // capturing subpatterns exceeds the size of the vector.
549: // When this happens, there is a match and the output vector
550: // is filled, but we miss out on the positions of the extra subpatterns.
551: rc = vecsize / 2;
552: }
553:
554: return rc;
555: }
556:
557: bool RE::DoMatchImpl(const StringPiece& text,
558: Anchor anchor,
559: int* consumed,
560: const Arg* const* args,
561: int n,
562: int* vec,
563: int vecsize) const {
564: assert((1 + n) * 3 <= vecsize); // results + PCRE workspace
565: int matches = TryMatch(text, 0, anchor, true, vec, vecsize);
566: assert(matches >= 0); // TryMatch never returns negatives
567: if (matches == 0)
568: return false;
569:
570: *consumed = vec[1];
571:
572: if (n == 0 || args == NULL) {
573: // We are not interested in results
574: return true;
575: }
576:
577: if (NumberOfCapturingGroups() < n) {
578: // RE has fewer capturing groups than number of arg pointers passed in
579: return false;
580: }
581:
582: // If we got here, we must have matched the whole pattern.
583: // We do not need (can not do) any more checks on the value of 'matches' here
584: // -- see the comment for TryMatch.
585: for (int i = 0; i < n; i++) {
586: const int start = vec[2*(i+1)];
587: const int limit = vec[2*(i+1)+1];
588: if (!args[i]->Parse(text.data() + start, limit-start)) {
589: // TODO: Should we indicate what the error was?
590: return false;
591: }
592: }
593:
594: return true;
595: }
596:
597: bool RE::DoMatch(const StringPiece& text,
598: Anchor anchor,
599: int* consumed,
600: const Arg* const args[],
601: int n) const {
602: assert(n >= 0);
603: size_t const vecsize = (1 + n) * 3; // results + PCRE workspace
604: // (as for kVecSize)
605: int space[21]; // use stack allocation for small vecsize (common case)
606: int* vec = vecsize <= 21 ? space : new int[vecsize];
607: bool retval = DoMatchImpl(text, anchor, consumed, args, n, vec, (int)vecsize);
608: if (vec != space) delete [] vec;
609: return retval;
610: }
611:
612: bool RE::Rewrite(string *out, const StringPiece &rewrite,
613: const StringPiece &text, int *vec, int veclen) const {
614: for (const char *s = rewrite.data(), *end = s + rewrite.size();
615: s < end; s++) {
616: int c = *s;
617: if (c == '\\') {
618: c = *++s;
619: if (isdigit(c)) {
620: int n = (c - '0');
621: if (n >= veclen) {
622: //fprintf(stderr, requested group %d in regexp %.*s\n",
623: // n, rewrite.size(), rewrite.data());
624: return false;
625: }
626: int start = vec[2 * n];
627: if (start >= 0)
628: out->append(text.data() + start, vec[2 * n + 1] - start);
629: } else if (c == '\\') {
630: *out += '\\';
631: } else {
632: //fprintf(stderr, "invalid rewrite pattern: %.*s\n",
633: // rewrite.size(), rewrite.data());
634: return false;
635: }
636: } else {
637: *out += c;
638: }
639: }
640: return true;
641: }
642:
643: // Return the number of capturing subpatterns, or -1 if the
644: // regexp wasn't valid on construction.
645: int RE::NumberOfCapturingGroups() const {
646: if (re_partial_ == NULL) return -1;
647:
648: int result;
649: int pcre_retval = pcre_fullinfo(re_partial_, // The regular expression object
650: NULL, // We did not study the pattern
651: PCRE_INFO_CAPTURECOUNT,
652: &result);
653: assert(pcre_retval == 0);
654: return result;
655: }
656:
657: /***** Parsers for various types *****/
658:
659: bool Arg::parse_null(const char* str, int n, void* dest) {
660: // We fail if somebody asked us to store into a non-NULL void* pointer
661: return (dest == NULL);
662: }
663:
664: bool Arg::parse_string(const char* str, int n, void* dest) {
665: if (dest == NULL) return true;
666: reinterpret_cast<string*>(dest)->assign(str, n);
667: return true;
668: }
669:
670: bool Arg::parse_stringpiece(const char* str, int n, void* dest) {
671: if (dest == NULL) return true;
672: reinterpret_cast<StringPiece*>(dest)->set(str, n);
673: return true;
674: }
675:
676: bool Arg::parse_char(const char* str, int n, void* dest) {
677: if (n != 1) return false;
678: if (dest == NULL) return true;
679: *(reinterpret_cast<char*>(dest)) = str[0];
680: return true;
681: }
682:
683: bool Arg::parse_uchar(const char* str, int n, void* dest) {
684: if (n != 1) return false;
685: if (dest == NULL) return true;
686: *(reinterpret_cast<unsigned char*>(dest)) = str[0];
687: return true;
688: }
689:
690: // Largest number spec that we are willing to parse
691: static const int kMaxNumberLength = 32;
692:
693: // REQUIRES "buf" must have length at least kMaxNumberLength+1
694: // REQUIRES "n > 0"
695: // Copies "str" into "buf" and null-terminates if necessary.
696: // Returns one of:
697: // a. "str" if no termination is needed
698: // b. "buf" if the string was copied and null-terminated
699: // c. "" if the input was invalid and has no hope of being parsed
700: static const char* TerminateNumber(char* buf, const char* str, int n) {
701: if ((n > 0) && isspace(*str)) {
702: // We are less forgiving than the strtoxxx() routines and do not
703: // allow leading spaces.
704: return "";
705: }
706:
707: // See if the character right after the input text may potentially
708: // look like a digit.
709: if (isdigit(str[n]) ||
710: ((str[n] >= 'a') && (str[n] <= 'f')) ||
711: ((str[n] >= 'A') && (str[n] <= 'F'))) {
712: if (n > kMaxNumberLength) return ""; // Input too big to be a valid number
713: memcpy(buf, str, n);
714: buf[n] = '\0';
715: return buf;
716: } else {
717: // We can parse right out of the supplied string, so return it.
718: return str;
719: }
720: }
721:
722: bool Arg::parse_long_radix(const char* str,
723: int n,
724: void* dest,
725: int radix) {
726: if (n == 0) return false;
727: char buf[kMaxNumberLength+1];
728: str = TerminateNumber(buf, str, n);
729: char* end;
730: errno = 0;
731: long r = strtol(str, &end, radix);
732: if (end != str + n) return false; // Leftover junk
733: if (errno) return false;
734: if (dest == NULL) return true;
735: *(reinterpret_cast<long*>(dest)) = r;
736: return true;
737: }
738:
739: bool Arg::parse_ulong_radix(const char* str,
740: int n,
741: void* dest,
742: int radix) {
743: if (n == 0) return false;
744: char buf[kMaxNumberLength+1];
745: str = TerminateNumber(buf, str, n);
746: if (str[0] == '-') return false; // strtoul() on a negative number?!
747: char* end;
748: errno = 0;
749: unsigned long r = strtoul(str, &end, radix);
750: if (end != str + n) return false; // Leftover junk
751: if (errno) return false;
752: if (dest == NULL) return true;
753: *(reinterpret_cast<unsigned long*>(dest)) = r;
754: return true;
755: }
756:
757: bool Arg::parse_short_radix(const char* str,
758: int n,
759: void* dest,
760: int radix) {
761: long r;
762: if (!parse_long_radix(str, n, &r, radix)) return false; // Could not parse
763: if (r < SHRT_MIN || r > SHRT_MAX) return false; // Out of range
764: if (dest == NULL) return true;
765: *(reinterpret_cast<short*>(dest)) = static_cast<short>(r);
766: return true;
767: }
768:
769: bool Arg::parse_ushort_radix(const char* str,
770: int n,
771: void* dest,
772: int radix) {
773: unsigned long r;
774: if (!parse_ulong_radix(str, n, &r, radix)) return false; // Could not parse
775: if (r > USHRT_MAX) return false; // Out of range
776: if (dest == NULL) return true;
777: *(reinterpret_cast<unsigned short*>(dest)) = static_cast<unsigned short>(r);
778: return true;
779: }
780:
781: bool Arg::parse_int_radix(const char* str,
782: int n,
783: void* dest,
784: int radix) {
785: long r;
786: if (!parse_long_radix(str, n, &r, radix)) return false; // Could not parse
787: if (r < INT_MIN || r > INT_MAX) return false; // Out of range
788: if (dest == NULL) return true;
789: *(reinterpret_cast<int*>(dest)) = r;
790: return true;
791: }
792:
793: bool Arg::parse_uint_radix(const char* str,
794: int n,
795: void* dest,
796: int radix) {
797: unsigned long r;
798: if (!parse_ulong_radix(str, n, &r, radix)) return false; // Could not parse
799: if (r > UINT_MAX) return false; // Out of range
800: if (dest == NULL) return true;
801: *(reinterpret_cast<unsigned int*>(dest)) = r;
802: return true;
803: }
804:
805: bool Arg::parse_longlong_radix(const char* str,
806: int n,
807: void* dest,
808: int radix) {
809: #ifndef HAVE_LONG_LONG
810: return false;
811: #else
812: if (n == 0) return false;
813: char buf[kMaxNumberLength+1];
814: str = TerminateNumber(buf, str, n);
815: char* end;
816: errno = 0;
817: #if defined HAVE_STRTOQ
818: long long r = strtoq(str, &end, radix);
819: #elif defined HAVE_STRTOLL
820: long long r = strtoll(str, &end, radix);
821: #elif defined HAVE__STRTOI64
822: long long r = _strtoi64(str, &end, radix);
823: #elif defined HAVE_STRTOIMAX
824: long long r = strtoimax(str, &end, radix);
825: #else
826: #error parse_longlong_radix: cannot convert input to a long-long
827: #endif
828: if (end != str + n) return false; // Leftover junk
829: if (errno) return false;
830: if (dest == NULL) return true;
831: *(reinterpret_cast<long long*>(dest)) = r;
832: return true;
833: #endif /* HAVE_LONG_LONG */
834: }
835:
836: bool Arg::parse_ulonglong_radix(const char* str,
837: int n,
838: void* dest,
839: int radix) {
840: #ifndef HAVE_UNSIGNED_LONG_LONG
841: return false;
842: #else
843: if (n == 0) return false;
844: char buf[kMaxNumberLength+1];
845: str = TerminateNumber(buf, str, n);
846: if (str[0] == '-') return false; // strtoull() on a negative number?!
847: char* end;
848: errno = 0;
849: #if defined HAVE_STRTOQ
850: unsigned long long r = strtouq(str, &end, radix);
851: #elif defined HAVE_STRTOLL
852: unsigned long long r = strtoull(str, &end, radix);
853: #elif defined HAVE__STRTOI64
854: unsigned long long r = _strtoui64(str, &end, radix);
855: #elif defined HAVE_STRTOIMAX
856: unsigned long long r = strtoumax(str, &end, radix);
857: #else
858: #error parse_ulonglong_radix: cannot convert input to a long-long
859: #endif
860: if (end != str + n) return false; // Leftover junk
861: if (errno) return false;
862: if (dest == NULL) return true;
863: *(reinterpret_cast<unsigned long long*>(dest)) = r;
864: return true;
865: #endif /* HAVE_UNSIGNED_LONG_LONG */
866: }
867:
868: bool Arg::parse_double(const char* str, int n, void* dest) {
869: if (n == 0) return false;
870: static const int kMaxLength = 200;
871: char buf[kMaxLength];
872: if (n >= kMaxLength) return false;
873: memcpy(buf, str, n);
874: buf[n] = '\0';
875: errno = 0;
876: char* end;
877: double r = strtod(buf, &end);
878: if (end != buf + n) return false; // Leftover junk
879: if (errno) return false;
880: if (dest == NULL) return true;
881: *(reinterpret_cast<double*>(dest)) = r;
882: return true;
883: }
884:
885: bool Arg::parse_float(const char* str, int n, void* dest) {
886: double r;
887: if (!parse_double(str, n, &r)) return false;
888: if (dest == NULL) return true;
889: *(reinterpret_cast<float*>(dest)) = static_cast<float>(r);
890: return true;
891: }
892:
893:
894: #define DEFINE_INTEGER_PARSERS(name) \
895: bool Arg::parse_##name(const char* str, int n, void* dest) { \
896: return parse_##name##_radix(str, n, dest, 10); \
897: } \
898: bool Arg::parse_##name##_hex(const char* str, int n, void* dest) { \
899: return parse_##name##_radix(str, n, dest, 16); \
900: } \
901: bool Arg::parse_##name##_octal(const char* str, int n, void* dest) { \
902: return parse_##name##_radix(str, n, dest, 8); \
903: } \
904: bool Arg::parse_##name##_cradix(const char* str, int n, void* dest) { \
905: return parse_##name##_radix(str, n, dest, 0); \
906: }
907:
908: DEFINE_INTEGER_PARSERS(short) /* */
909: DEFINE_INTEGER_PARSERS(ushort) /* */
910: DEFINE_INTEGER_PARSERS(int) /* Don't use semicolons after these */
911: DEFINE_INTEGER_PARSERS(uint) /* statements because they can cause */
912: DEFINE_INTEGER_PARSERS(long) /* compiler warnings if the checking */
913: DEFINE_INTEGER_PARSERS(ulong) /* level is turned up high enough. */
914: DEFINE_INTEGER_PARSERS(longlong) /* */
915: DEFINE_INTEGER_PARSERS(ulonglong) /* */
916:
917: #undef DEFINE_INTEGER_PARSERS
918:
919: } // namespace pcrecpp
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