mirror of
https://github.com/alliedmodders/amxmodx.git
synced 2024-12-29 16:25:35 +03:00
824 lines
17 KiB
C++
824 lines
17 KiB
C++
// vim: set ts=4 sw=4 tw=99 noet:
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//
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// AMX Mod X, based on AMX Mod by Aleksander Naszko ("OLO").
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// Copyright (C) The AMX Mod X Development Team.
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//
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// This software is licensed under the GNU General Public License, version 3 or higher.
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// Additional exceptions apply. For full license details, see LICENSE.txt or visit:
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// https://alliedmods.net/amxmodx-license
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//
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// Regular Expressions Module
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//
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#include "amxxmodule.h"
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#include "pcre.h"
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#include "CRegEx.h"
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#include <string.h>
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#include <ctype.h>
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#include "utils.h"
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RegEx::RegEx()
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{
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mErrorOffset = 0;
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mError = NULL;
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re = NULL;
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mFree = true;
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subject = NULL;
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mSubStrings.clear();
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mMatchesSubs.clear();
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mSubsNameTable.clear();
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mNumSubpatterns = 0;
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}
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void RegEx::Clear()
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{
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mErrorOffset = 0;
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mError = NULL;
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if (re)
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pcre_free(re);
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re = NULL;
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mFree = true;
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if (subject)
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delete[] subject;
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subject = NULL;
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mSubStrings.clear();
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mMatchesSubs.clear();
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mSubsNameTable.clear();
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mNumSubpatterns = 0;
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}
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RegEx::~RegEx()
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{
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Clear();
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}
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bool RegEx::isFree(bool set, bool val)
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{
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if (set)
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{
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mFree = val;
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return true;
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} else {
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return mFree;
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}
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}
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int RegEx::Compile(const char *pattern, const char* flags)
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{
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if (!mFree)
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Clear();
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int iFlags = 0;
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if (flags != NULL)
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{
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for ( ; *flags != 0; flags++)
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{
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switch (*flags)
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{
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case 'i':
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{
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iFlags |= PCRE_CASELESS;
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break;
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}
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case 'm':
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{
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iFlags |= PCRE_MULTILINE;
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break;
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}
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case 's':
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{
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iFlags |= PCRE_DOTALL;
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break;
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}
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case 'x':
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{
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iFlags |= PCRE_EXTENDED;
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break;
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}
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default:
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{
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break;
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}
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}
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}
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}
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re = pcre_compile(pattern, iFlags, &mError, &mErrorOffset, NULL);
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if (re == NULL)
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{
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return 0;
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}
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mFree = false;
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return 1;
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}
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int RegEx::Compile(const char *pattern, int iFlags)
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{
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if (!mFree)
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Clear();
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re = pcre_compile(pattern, iFlags, &mError, &mErrorOffset, NULL);
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if (re == NULL)
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{
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return 0;
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}
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mFree = false;
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/**
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* Retrieve the number of captured groups
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* including the full match.
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*/
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pcre_fullinfo(re, NULL, PCRE_INFO_CAPTURECOUNT, &mNumSubpatterns);
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++mNumSubpatterns;
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/**
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* Build the table with the named groups,
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* which contain an index and a name per group.
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*/
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MakeSubpatternsTable(mNumSubpatterns);
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return 1;
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}
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int RegEx::Match(const char *str)
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{
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int rc = 0;
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if (mFree || re == NULL)
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return -1;
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ClearMatch();
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//save str
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subject = new char[strlen(str) + 1];
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strcpy(subject, str);
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rc = pcre_exec(re, NULL, subject, (int)strlen(subject), 0, 0, ovector, REGEX_MAX_SUBPATTERNS);
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if (rc < 0)
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{
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if (rc == PCRE_ERROR_NOMATCH)
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{
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return 0;
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}
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else {
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mErrorOffset = rc;
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return -1;
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}
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}
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RegExSub res;
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mSubStrings.ensure(rc);
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for (int s = 0; s < rc; ++s)
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{
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res.start = ovector[2 * s];
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res.end = ovector[2 * s + 1];
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mSubStrings.append(res);
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}
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return 1;
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}
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int RegEx::MatchAll(const char *str)
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{
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int rr = 0;
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int rc = 0;
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int startOffset = 0;
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int exoptions = 0;
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int notEmpty = 0;
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int sizeOffsets = mNumSubpatterns * 3;
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int subjectLen = strlen(str);
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if (mFree || re == NULL)
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{
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return -1;
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}
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ClearMatch();
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subject = new char[subjectLen + 1];
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strcpy(subject, str);
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RegExSub sub;
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while (1)
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{
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rr = pcre_exec(re, NULL, subject, (int)subjectLen, startOffset, exoptions | notEmpty, ovector, REGEX_MAX_SUBPATTERNS);
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/**
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* The string was already proved to be valid UTF-8
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*/
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exoptions |= PCRE_NO_UTF8_CHECK;
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/**
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* Too many substrings
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*/
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if (rr == 0)
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{
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rr = sizeOffsets / 3;
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}
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if (rr > 0)
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{
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mMatchesSubs.append(rr);
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for (int s = 0; s < rr; ++s)
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{
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sub.start = ovector[2 * s];
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sub.end = ovector[2 * s + 1];
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mSubStrings.append(sub);
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}
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}
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else if (rr == PCRE_ERROR_NOMATCH)
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{
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/**
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* If we previously set PCRE_NOTEMPTY after a null match,
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* this is not necessarily the end. We need to advance
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* the start offset, and continue. Fudge the offset values
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* to achieve this, unless we're already at the end of the string.
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*/
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if (notEmpty && startOffset < (int)subjectLen)
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{
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ovector[0] = startOffset;
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ovector[1] = startOffset + 1;
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}
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else
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{
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break;
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}
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}
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else
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{
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mErrorOffset = rr;
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if (mMatchesSubs.length())
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{
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ClearMatch();
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}
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return -1;
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}
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/**
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* If we have matched an empty string, mimic what Perl's /g options does.
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* This turns out to be rather cunning. First we set PCRE_NOTEMPTY and try
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* the match again at the same point. If this fails (picked up above) we
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* advance to the next character.
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*/
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notEmpty = (ovector[1] == ovector[0]) ? PCRE_NOTEMPTY | PCRE_ANCHORED : 0;
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/**
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* Advance to the next piece.
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*/
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startOffset = ovector[1];
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}
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if (!mMatchesSubs.length())
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{
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return 0;
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}
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return 1;
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}
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void RegEx::ClearMatch()
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{
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// Clears match results
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mErrorOffset = 0;
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mError = NULL;
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if (subject)
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delete[] subject;
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subject = NULL;
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mSubStrings.clear();
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mMatchesSubs.clear();
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}
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const char *getSubstring(char *subject, size_t start, size_t end, char buffer[], size_t max, size_t *outlen)
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{
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size_t i;
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char * substr_a = subject + start;
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size_t substr_l = end - start;
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for (i = 0; i < substr_l; i++)
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{
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if (i >= max)
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break;
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buffer[i] = substr_a[i];
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}
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buffer[i] = '\0';
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if (outlen)
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{
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*outlen = i;
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}
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return buffer;
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}
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const char *RegEx::GetSubstring(size_t start, char buffer[], size_t max, size_t *outlen)
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{
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if (start >= mSubStrings.length())
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{
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return NULL;
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}
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RegExSub sub = mSubStrings.at(start);
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return getSubstring(subject, sub.start, sub.end, buffer, max, outlen);
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}
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void RegEx::MakeSubpatternsTable(int numSubpatterns)
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{
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int nameCount = 0;
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int rc = pcre_fullinfo(re, NULL, PCRE_INFO_NAMECOUNT, &nameCount);
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if (rc < 0)
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{
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return;
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}
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if (nameCount > 0)
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{
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const char *nameTable;
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int nameSize = 0;
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int i = 0;
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int rc1 = pcre_fullinfo(re, NULL, PCRE_INFO_NAMETABLE, &nameTable);
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int rc2 = pcre_fullinfo(re, NULL, PCRE_INFO_NAMEENTRYSIZE, &nameSize);
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rc = rc2 ? rc2 : rc1;
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if (rc < 0)
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{
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mSubsNameTable.clear();
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return;
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}
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NamedGroup data;
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while (i++ < nameCount)
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{
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data.index = 0xff * (unsigned char)nameTable[0] + (unsigned char)nameTable[1];
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data.name = nameTable + 2;
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mSubsNameTable.append(ke::Move(data));
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nameTable += nameSize;
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}
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}
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}
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int RegEx::Replace(char *text, size_t textMaxLen, const char *replace, size_t replaceLen, int flags)
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{
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char *output = text;
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/**
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* Retrieve all matches and store them in
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* mSubStrings list.
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*/
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if (MatchAll(output) == -1)
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{
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return -1;
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}
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size_t subjectLen = strlen(subject);
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size_t total = 0;
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size_t baseIndex = 0;
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size_t diffLength = 0;
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char *toReplace = new char[textMaxLen + 1];
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char *toSearch = NULL;
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/**
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* All characters which is not matched are not copied when replacing matches.
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* Then original text (output buffer) should be considerated as empty.
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*/
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if (flags & REGEX_FORMAT_NOCOPY)
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{
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*output = '\0';
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}
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else
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{
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/**
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* This is used only when we do replace matches.
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*/
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toSearch = new char[textMaxLen + 1];
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}
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/**
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* Loop over all matches found.
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*/
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for (size_t i = 0; i < mMatchesSubs.length(); ++i)
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{
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char *ptr = toReplace;
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size_t browsed = 0;
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size_t searchLen = 0;
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size_t length = 0;
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/**
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* Build the replace string as it can contain backreference
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* and this needs to be parsed.
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*/
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for (const char *s = replace, *end = s + replaceLen; s < end && browsed <= textMaxLen; ++s, ++browsed)
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{
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unsigned int c = *s;
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/**
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* Supported format specifiers:
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*
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* $number : Substitutes the substring matched by group number.
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* n must be an integer value designating a valid backreference, greater than 0, and of two digits at most.
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* ${name} : Substitutes the substring matched by the named group name (a maximum of 32 characters).
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* $& : Substitutes a copy of the whole match.
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* $` : Substitutes all the text of the input string before the match.
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* $' : Substitutes all the text of the input string after the match.
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* $+ : Substitutes the last group that was captured.
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* $_ : Substitutes the entire input string.
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* $$ : Substitutes a literal "$".
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*/
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if (c == '$' || c == '\\')
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{
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switch (*++s)
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{
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case '\0':
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{
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/**
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* End of string.
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* Copy one character.
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*/
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*(ptr + browsed) = c;
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break;
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}
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case '&':
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{
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/**
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* Concatenate retrieved full match sub-string.
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* length - 1 to overwrite EOS.
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*/
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GetSubstring(baseIndex, ptr + browsed, textMaxLen, &length);
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browsed += length - 1;
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break;
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}
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case '`':
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{
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/**
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* Concatenate part of original text up to
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* first sub-string position.
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*/
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length = mSubStrings.at(baseIndex).start;
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memcpy(ptr + browsed, subject, length);
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browsed += length - 1;
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break;
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}
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case '\'':
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{
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/**
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* Concatenate part of original text from
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* last sub-string end position to EOS.
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*/
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length = mSubStrings.at(baseIndex).end;
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memcpy(ptr + browsed, subject + length, subjectLen - length);
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browsed += (subjectLen - length) - 1;
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break;
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}
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case '+':
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{
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/**
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* Copy the last group that was captured.
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*/
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GetSubstring(baseIndex + mMatchesSubs.at(i) - 1, ptr + browsed, textMaxLen, &length);
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browsed += length - 1;
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break;
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}
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case '_':
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{
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/**
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* Copy the entire input string.
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*/
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memcpy(ptr + browsed, subject, subjectLen);
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browsed += (subjectLen - 1);
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break;
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}
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case '$':
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case '\\':
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{
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/**
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* Copy the single character $ or \.
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*/
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*(ptr + browsed) = c;
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break;
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}
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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case '{':
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{
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/**
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* Checking backreference.
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* Which can be either $n, ${n} or ${name}.
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*/
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int backref = -1;
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const char *walk = s;
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bool inBrace = false;
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bool nameCheck = false;
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/**
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* ${nn}.
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* ^
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*/
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if (*walk == '{')
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{
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inBrace = true;
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++walk;
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}
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/**
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* Valid number.
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* $nn or ${nn}
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* ^ ^
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*/
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if (*walk >= '0' && *walk <= '9')
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{
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backref = *walk - '0';
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++walk;
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}
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else if (inBrace)
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{
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nameCheck = true;
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/**
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* Not a valid number.
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* Checking as string.
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* ${name}
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* ^
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*/
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if (*walk)
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{
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const char *pch = strchr(walk, '}');
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if (pch != NULL)
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{
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/**
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* A named group maximum character is 32 (PCRE).
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*/
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char name[32];
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size_t nameLength = strncopy(name, walk, pch - walk + 1);
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int flags, num = 0;
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pcre_fullinfo(re, NULL, PCRE_INFO_OPTIONS, &flags);
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/**
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* If PCRE_DUPNAMES is set, the pcre_copy_named_substring function should be used
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* as pcre_get_stringnumber output order is not defined.
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*/
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if (flags & PCRE_DUPNAMES)
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{
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memset(ovector, 0, REGEX_MAX_SUBPATTERNS * sizeof(int));
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/**
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* pcre_copy_named_substring needs a vector containing sub-patterns ranges
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* for a given match.
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*/
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for (size_t j = 0; j < mMatchesSubs.at(i); ++j)
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{
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ovector[2 * j] = mSubStrings.at(baseIndex + j).start;
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ovector[2 * j + 1] = mSubStrings.at(baseIndex + j).end;
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}
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num = pcre_copy_named_substring(re, subject, ovector, mMatchesSubs.at(i), name, ptr + browsed, (int)textMaxLen);
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if (num != PCRE_ERROR_NOSUBSTRING)
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{
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browsed += num - 1;
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s = pch;
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break;
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}
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++pch;
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}
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else
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{
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/**
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* Retrieve sub-pattern index from a give name.
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*/
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num = pcre_get_stringnumber(re, name);
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if (num != PCRE_ERROR_NOSUBSTRING)
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{
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backref = num;
|
|
walk = ++pch;
|
|
}
|
|
}
|
|
|
|
if (num == PCRE_ERROR_NOSUBSTRING || num >= (int)mMatchesSubs.at(i))
|
|
{
|
|
/**
|
|
* If a sub-string for a given match is not found, or if > to
|
|
* number of sub-patterns we still need to check if this
|
|
* group name is a valid one because if so we want to escape it.
|
|
* Looking at the name table.
|
|
*/
|
|
bool found = false;
|
|
for (size_t i = 0; i < mSubsNameTable.length(); ++i)
|
|
{
|
|
if (!mSubsNameTable.at(i).name.compare(name))
|
|
{
|
|
--browsed;
|
|
s = --pch;
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (found)
|
|
{
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!nameCheck)
|
|
{
|
|
/**
|
|
* Valid second number.
|
|
* $nn or ${nn}
|
|
* ^ ^
|
|
*/
|
|
if (*walk && *walk >= '0' && *walk <= '9')
|
|
{
|
|
backref = backref * 10 + *walk - '0';
|
|
++walk;
|
|
}
|
|
|
|
if (inBrace)
|
|
{
|
|
/**
|
|
* Invalid specifier
|
|
* Either hit EOS or missing }.
|
|
* ${n or ${nn or ${nx or ${nnx
|
|
* ^ ^ ^ ^
|
|
*/
|
|
if (*walk == '\0' || *walk != '}')
|
|
{
|
|
backref = -1;
|
|
}
|
|
else
|
|
{
|
|
++walk;
|
|
}
|
|
}
|
|
}
|
|
|
|
length = walk - s;
|
|
s = --walk;
|
|
|
|
/**
|
|
* We can't provide a capture number >= to total that pcre_exec has found.
|
|
* 0 is implicitly accepted, same behavior as $&.
|
|
*/
|
|
if (backref >= 0 && backref < mNumSubpatterns)
|
|
{
|
|
/**
|
|
* Valid available index for a given match.
|
|
*/
|
|
if ((size_t)backref < mMatchesSubs.at(i))
|
|
{
|
|
/**
|
|
* Concatenate retrieved sub-string.
|
|
* length - 1 to overwrite EOS.
|
|
*/
|
|
GetSubstring(baseIndex + backref, ptr + browsed, textMaxLen, &length);
|
|
browsed += length - 1;
|
|
}
|
|
else
|
|
{
|
|
/**
|
|
* Valid unavailable index for a given match.
|
|
*/
|
|
--browsed;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/**
|
|
* If we here it means the syntax is valid but sub-pattern doesn't exist.
|
|
* So, copy as it is, including $.
|
|
*/
|
|
memcpy(ptr + browsed, s - length, length + 1);
|
|
browsed += length;
|
|
}
|
|
|
|
break;
|
|
}
|
|
default:
|
|
{
|
|
/**
|
|
* Not a valid format modifier.
|
|
* So we copy characters as it is.
|
|
*/
|
|
*(ptr + browsed) = *s;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/**
|
|
* At this point, direct copy.
|
|
*/
|
|
*(ptr + browsed) = c;
|
|
}
|
|
}
|
|
|
|
*(ptr + browsed) = '\0';
|
|
|
|
/**
|
|
* Concatenate only replace string of each match,
|
|
* as we don't want to copy unmatched characters.
|
|
*/
|
|
if (flags & REGEX_FORMAT_NOCOPY)
|
|
{
|
|
/**
|
|
* We want just the first occurrence.
|
|
*/
|
|
if (total++ && (flags & REGEX_FORMAT_FIRSTONLY))
|
|
{
|
|
break;
|
|
}
|
|
|
|
strncat(output, toReplace, textMaxLen + 1);
|
|
}
|
|
else
|
|
{
|
|
/**
|
|
* Retrieves full string of a given match.
|
|
*/
|
|
const char *search = GetSubstring(baseIndex, toSearch, textMaxLen, &searchLen);
|
|
|
|
/**
|
|
* We get something to replace, but the sub-pattern to search is empty.
|
|
* We insert replacement either a the start end or string.
|
|
*/
|
|
if (*toReplace && !searchLen)
|
|
{
|
|
if (output - text > 0)
|
|
{
|
|
strncat(output, toReplace, textMaxLen);
|
|
}
|
|
else
|
|
{
|
|
strncat(toReplace, text, textMaxLen);
|
|
strncopy(text, toReplace, strlen(toReplace) + 1);
|
|
}
|
|
|
|
++total;
|
|
}
|
|
else if ((output = UTIL_ReplaceEx(text + mSubStrings.at(baseIndex).start + diffLength, textMaxLen, search, searchLen, toReplace, browsed, false)) != NULL)
|
|
{
|
|
/**
|
|
* Then we simply do a replace.
|
|
* Probably not the most efficient, but this should be at least safe.
|
|
* To avoid issue where the function could find a string which is not at the expected index,
|
|
* We force the input string to start from index of the full match.
|
|
*/
|
|
++total;
|
|
}
|
|
|
|
if (total && (flags & REGEX_FORMAT_FIRSTONLY))
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* mMatchesSubs is a flat list containing all sub-patterns of all matches.
|
|
* A number of sub-patterns can vary per match. So we calculate the position in the list,
|
|
* from where the first sub-pattern result of current match starts.
|
|
*/
|
|
baseIndex += mMatchesSubs.at(i);
|
|
diffLength += browsed - searchLen;
|
|
}
|
|
|
|
delete[] toReplace;
|
|
|
|
if (toSearch != NULL)
|
|
{
|
|
delete[] toSearch;
|
|
}
|
|
|
|
/**
|
|
* Return the number of successful replacements.
|
|
*/
|
|
return total;
|
|
}
|