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447 lines
12 KiB
447 lines
12 KiB
/*
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* This file is part of the KDE libraries
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* Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
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* Copyright (C) 2003,2004 Apple Computer, Inc.
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* Copyright (C) 2006 Maksim Orlovich (maksim@kde.org)
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include "regexp.h"
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#include "lexer.h"
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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using namespace KJS;
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#ifdef PCRE_CONFIG_UTF8
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RegExp::UTF8SupportState RegExp::utf8Support = RegExp::Unknown;
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#endif
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RegExp::RegExp(const UString &p, int f)
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: pat(p), flgs(f), m_notEmpty(false), valid(true), buffer(0), originalPos(0)
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{
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// Determine whether libpcre has unicode support if need be..
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#ifdef PCRE_CONFIG_UTF8
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if (utf8Support == Unknown) {
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int supported;
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pcre_config(PCRE_CONFIG_UTF8, (void*)&supported);
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utf8Support = supported ? Supported : Unsupported;
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}
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#endif
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nrSubPatterns = 0; // determined in match() with POSIX regex.
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// JS regexps can contain Unicode escape sequences (\uxxxx) which
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// are rather uncommon elsewhere. As our regexp libs don't understand
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// them we do the unescaping ourselves internally.
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// Also make sure to expand out any nulls as pcre_compile
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// expects null termination..
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UString intern;
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const char* const nil = "\\x00";
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if (p.find('\\') >= 0 || p.find(KJS::UChar('\0')) >= 0) {
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bool escape = false;
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for (int i = 0; i < p.size(); ++i) {
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UChar c = p[i];
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if (escape) {
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escape = false;
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// we only care about \u
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if (c == 'u') {
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// standard unicode escape sequence looks like \uxxxx but
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// other browsers also accept less then 4 hex digits
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unsigned short u = 0;
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int j = 0;
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for (j = 0; j < 4; ++j) {
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if (i + 1 < p.size() && Lexer::isHexDigit(p[i + 1].unicode())) {
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u = (u << 4) + Lexer::convertHex(p[i + 1].unicode());
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++i;
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} else {
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// sequence incomplete. restore index.
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// TODO: cleaner way to propagate warning
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fprintf(stderr, "KJS: saw %d digit \\u sequence.\n", j);
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i -= j;
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break;
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}
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}
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if (j < 4) {
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// sequence was incomplete. treat \u as u which IE always
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// and FF sometimes does.
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intern.append(UString('u'));
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} else {
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c = UChar(u);
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switch (u) {
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case 0:
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// Make sure to encode 0, to avoid terminating the string
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intern += UString(nil);
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break;
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case '^':
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case '$':
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case '\\':
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case '.':
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case '*':
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case '+':
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case '?':
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case '(': case ')':
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case '{': case '}':
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case '[': case ']':
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case '|':
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// escape pattern characters have to remain escaped
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intern.append(UString('\\'));
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// intentional fallthrough
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default:
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intern += UString(&c, 1);
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break;
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}
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}
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continue;
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}
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intern += UString('\\');
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intern += UString(&c, 1);
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} else {
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if (c == '\\')
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escape = true;
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else if (c == '\0')
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intern += UString(nil);
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else
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intern += UString(&c, 1);
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}
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}
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} else {
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intern = p;
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}
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#ifdef HAVE_PCREPOSIX
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int pcreflags = 0;
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const char *perrormsg;
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int errorOffset;
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if (flgs & IgnoreCase)
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pcreflags |= PCRE_CASELESS;
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if (flgs & Multiline)
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pcreflags |= PCRE_MULTILINE;
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#ifdef PCRE_CONFIG_UTF8
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if (utf8Support == Supported)
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pcreflags |= (PCRE_UTF8 | PCRE_NO_UTF8_CHECK);
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#endif
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// Fill our buffer with an encoded version, whether utf-8, or,
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// if PCRE is incapable, truncated.
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prepareMatch(intern);
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pcregex = pcre_compile(buffer, pcreflags,
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&perrormsg, &errorOffset, NULL);
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doneMatch(); // Cleanup buffers
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if (!pcregex) {
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#ifndef NDEBUG
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fprintf(stderr, "KJS: pcre_compile() failed with '%s'\n", perrormsg);
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#endif
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valid = false;
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return;
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}
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#ifdef PCRE_INFO_CAPTURECOUNT
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// Get number of subpatterns that will be returned
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int rc = pcre_fullinfo( pcregex, NULL, PCRE_INFO_CAPTURECOUNT, &nrSubPatterns);
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if (rc != 0)
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#endif
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nrSubPatterns = 0; // fallback. We always need the first pair of offsets.
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#else /* HAVE_PCREPOSIX */
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int regflags = 0;
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#ifdef REG_EXTENDED
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regflags |= REG_EXTENDED;
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#endif
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#ifdef REG_ICASE
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if ( f & IgnoreCase )
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regflags |= REG_ICASE;
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#endif
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//NOTE: Multiline is not feasible with POSIX regex.
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//if ( f & Multiline )
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// ;
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// Note: the Global flag is already handled by RegExpProtoFunc::execute
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int errorCode = regcomp(&preg, intern.ascii(), regflags);
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if (errorCode != 0) {
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#ifndef NDEBUG
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char errorMessage[80];
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regerror(errorCode, &preg, errorMessage, sizeof errorMessage);
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fprintf(stderr, "KJS: regcomp failed with '%s'\n", errorMessage);
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#endif
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valid = false;
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}
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#endif
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}
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RegExp::~RegExp()
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{
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doneMatch(); // Be 100% sure buffers are freed
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#ifdef HAVE_PCREPOSIX
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if (pcregex)
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pcre_free(pcregex);
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#else
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/* TODO: is this really okay after an error ? */
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regfree(&preg);
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#endif
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}
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void RegExp::prepareUtf8(const UString& s)
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{
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// Allocate a buffer big enough to hold all the characters plus \0
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const int length = s.size();
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buffer = new char[length * 3 + 1];
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// Also create buffer for positions. We need one extra character in there,
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// even past the \0 since the non-empty handling may jump one past the end
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originalPos = new int[length * 3 + 2];
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// Convert to runs of 8-bit characters, and generate indeces
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// Note that we do NOT combine surrogate pairs here, as
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// regexps operate on them as separate characters
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char *p = buffer;
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int *posOut = originalPos;
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const UChar *d = s.data();
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for (int i = 0; i != length; ++i) {
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unsigned short c = d[i].unicode();
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int sequenceLen;
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if (c < 0x80) {
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*p++ = (char)c;
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sequenceLen = 1;
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} else if (c < 0x800) {
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*p++ = (char)((c >> 6) | 0xC0); // C0 is the 2-byte flag for UTF-8
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*p++ = (char)((c | 0x80) & 0xBF); // next 6 bits, with high bit set
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sequenceLen = 2;
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} else {
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*p++ = (char)((c >> 12) | 0xE0); // E0 is the 3-byte flag for UTF-8
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*p++ = (char)(((c >> 6) | 0x80) & 0xBF); // next 6 bits, with high bit set
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*p++ = (char)((c | 0x80) & 0xBF); // next 6 bits, with high bit set
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sequenceLen = 3;
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}
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while (sequenceLen > 0) {
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*posOut = i;
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++posOut;
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--sequenceLen;
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}
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}
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bufferSize = p - buffer;
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*p++ = '\0';
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// Record positions for \0, and the fictional character after that.
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*posOut = length;
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*(posOut+1) = length+1;
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}
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void RegExp::prepareASCII (const UString& s)
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{
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originalPos = 0;
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// Best-effort attempt to get something done
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// when we don't have utf 8 available -- use
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// truncated version, and pray for the best
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CString truncated = s.cstring();
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buffer = new char[truncated.size() + 1];
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memcpy(buffer, truncated.c_str(), truncated.size());
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buffer[truncated.size()] = '\0'; // For _compile use
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bufferSize = truncated.size();
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}
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void RegExp::prepareMatch(const UString &s)
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{
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delete[] originalPos; // Just to be sure..
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delete[] buffer;
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#ifdef PCRE_CONFIG_UTF8
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if (utf8Support == Supported)
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prepareUtf8(s);
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else
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#endif
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prepareASCII(s);
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#ifndef NDEBUG
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originalS = s;
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#endif
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}
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void RegExp::doneMatch()
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{
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delete[] originalPos; originalPos = 0;
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delete[] buffer; buffer = 0;
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}
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UString RegExp::match(const UString &s, int i, int *pos, int **ovector)
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{
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#ifndef NDEBUG
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assert(s.data() == originalS.data()); // Make sure prepareMatch got called right..
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#endif
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assert(valid);
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if (i < 0)
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i = 0;
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if (ovector)
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*ovector = 0L;
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int dummyPos;
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if (!pos)
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pos = &dummyPos;
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*pos = -1;
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if (i > s.size() || s.isNull())
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return UString::null;
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#ifdef HAVE_PCREPOSIX
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int ovecsize = (nrSubPatterns+1)*3; // see pcre docu
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if (ovector) *ovector = new int[ovecsize];
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if (!pcregex)
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return UString::null;
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int startPos;
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int nextPos;
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#ifdef PCRE_CONFIG_UTF8
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if (utf8Support == Supported) {
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startPos = i;
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while (originalPos[startPos] < i)
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++startPos;
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nextPos = startPos;
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if (i < s.size()) {
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while (originalPos[nextPos] < (i + 1))
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++nextPos;
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}
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} else
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#endif
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{
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startPos = i;
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nextPos = i + (i < s.size() ? 1 : 0);
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}
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int baseFlags =
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#ifdef PCRE_CONFIG_UTF8
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utf8Support == Supported ? PCRE_NO_UTF8_CHECK :
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#endif
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0;
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int numMatches = pcre_exec(pcregex, NULL, buffer, bufferSize, startPos,
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m_notEmpty ? (PCRE_NOTEMPTY | PCRE_ANCHORED | baseFlags) : baseFlags, // see man pcretest
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ovector ? *ovector : 0L, ovecsize);
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if (numMatches < 0)
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{
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// Failed to match.
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if (numMatches == PCRE_ERROR_NOMATCH && (flgs & Global) && m_notEmpty && ovector && startPos < nextPos)
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{
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// We set m_notEmpty ourselves, to look for a non-empty match
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// (see man pcretest or pcretest.c for details).
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// So we don't stop here, we want to try again at i+1.
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#ifdef KJS_VERBOSE
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fprintf(stderr, "No match after m_notEmpty. +1 and keep going.\n");
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#endif
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m_notEmpty = 0;
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numMatches = pcre_exec(pcregex, NULL, buffer, bufferSize, nextPos, baseFlags,
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ovector ? *ovector : 0L, ovecsize);
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if (numMatches < 0)
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return UString::null;
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}
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else // done
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return UString::null;
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}
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// Got a match, proceed with it.
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// But fix up the ovector if need be..
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if (ovector && originalPos) {
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for (unsigned c = 0; c < 2 * TQMIN((unsigned)numMatches, nrSubPatterns+1); ++c) {
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if ((*ovector)[c] != -1)
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(*ovector)[c] = originalPos[(*ovector)[c]];
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}
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}
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if (!ovector)
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return UString::null; // don't rely on the return value if you pass ovector==0
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#else
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const uint maxMatch = 10;
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regmatch_t rmatch[maxMatch];
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char *str = strdup(s.ascii()); // TODO: why ???
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if (regexec(&preg, str + i, maxMatch, rmatch, 0)) {
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free(str);
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return UString::null;
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}
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free(str);
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if (!ovector) {
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*pos = rmatch[0].rm_so + i;
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return s.substr(rmatch[0].rm_so + i, rmatch[0].rm_eo - rmatch[0].rm_so);
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}
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// map rmatch array to ovector used in PCRE case
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nrSubPatterns = 0;
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for (uint j = 0; j < maxMatch && rmatch[j].rm_so >= 0 ; j++) {
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nrSubPatterns++;
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// if the nonEmpty flag is set, return a failed match if any of the
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// subMatches happens to be an empty string.
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if (m_notEmpty && rmatch[j].rm_so == rmatch[j].rm_eo)
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return UString::null;
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}
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// Allow an ovector slot to return the (failed) match result.
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if (nrSubPatterns == 0) nrSubPatterns = 1;
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int ovecsize = (nrSubPatterns)*3; // see above
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*ovector = new int[ovecsize];
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for (uint j = 0; j < nrSubPatterns; j++) {
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(*ovector)[2*j] = rmatch[j].rm_so + i;
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(*ovector)[2*j+1] = rmatch[j].rm_eo + i;
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}
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#endif
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*pos = (*ovector)[0];
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if ( *pos == (*ovector)[1] && (flgs & Global) )
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{
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// empty match, next try will be with m_notEmpty=true
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m_notEmpty=true;
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}
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return s.substr((*ovector)[0], (*ovector)[1] - (*ovector)[0]);
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}
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#if 0 // unused
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bool RegExp::test(const UString &s, int)
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{
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#ifdef HAVE_PCREPOSIX
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int ovector[300];
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CString buffer(s.cstring());
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if (s.isNull() ||
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pcre_exec(pcregex, NULL, buffer.c_str(), buffer.size(), 0,
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0, ovector, 300) == PCRE_ERROR_NOMATCH)
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return false;
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else
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return true;
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#else
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char *str = strdup(s.ascii());
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int r = regexec(&preg, str, 0, 0, 0);
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free(str);
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return r == 0;
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#endif
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}
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#endif
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