847 lines
25 KiB
C++
847 lines
25 KiB
C++
//
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// file: rematch.cpp
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//
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/*
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**********************************************************************
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* Copyright (C) 2002 International Business Machines Corporation *
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* and others. All rights reserved. *
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**********************************************************************
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*/
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#include "unicode/utypes.h"
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#include "unicode/regex.h"
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#include "unicode/uniset.h"
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#include "unicode/uchar.h"
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#include "uassert.h"
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#include "uvector.h"
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#include "regeximp.h"
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#include "stdio.h"
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U_NAMESPACE_BEGIN
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//-----------------------------------------------------------------------------
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//
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// Constructor and Destructor
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//
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//-----------------------------------------------------------------------------
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RegexMatcher::RegexMatcher(const RegexPattern *pat) {
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fPattern = pat;
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fInput = NULL;
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fInputLength = 0;
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UErrorCode status = U_ZERO_ERROR;
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fBackTrackStack = new UStack(status); // TODO: do something with status.
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fCaptureStarts = new UVector(status);
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fCaptureEnds = new UVector(status);
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int i;
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for (i=0; i<=fPattern->fNumCaptureGroups; i++) {
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fCaptureStarts->addElement(-1, status);
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fCaptureEnds ->addElement(-1, status);
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}
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reset();
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}
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RegexMatcher::RegexMatcher(const RegexMatcher &other) {
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U_ASSERT(FALSE);
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}
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RegexMatcher::~RegexMatcher() {
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delete fBackTrackStack;
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delete fCaptureStarts;
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delete fCaptureEnds;
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}
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static const UChar BACKSLASH = 0x5c;
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static const UChar DOLLARSIGN = 0x24;
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//--------------------------------------------------------------------------------
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//
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// appendReplacement
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//
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//--------------------------------------------------------------------------------
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RegexMatcher &RegexMatcher::appendReplacement(UnicodeString &dest,
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const UnicodeString &replacement,
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UErrorCode &status) {
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if (U_FAILURE(status)) {
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return *this;
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}
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if (fMatch == FALSE) {
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status = U_REGEX_INVALID_STATE;
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return *this;
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}
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// Copy input string from the end of previous match to start of current match
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int32_t len = fMatchStart-fLastMatchEnd;
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if (len > 0) {
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dest.append(*fInput, fLastMatchEnd, len);
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}
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// scan the replacement text, looking for substitutions ($n) and \escapes.
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int32_t replLen = replacement.length();
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int32_t replIdx;
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for (replIdx = 0; replIdx<replLen; replIdx++) {
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UChar c = replacement.charAt(replIdx);
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if (c == BACKSLASH) {
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// Backslash Escape. Copy the following char out without further checks.
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replIdx++;
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if (replIdx >= replLen) {
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break;
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}
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c = replacement.charAt(replIdx);
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dest.append(c);
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continue;
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}
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if (c != DOLLARSIGN) {
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// Normal char, not a $. Copy it out without further checks.
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dest.append(c);
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continue;
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}
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// We've got a $. Pick up a capture group number if one follows.
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// Consume at most the number of digits necessary for the largest capture
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// number that is valid for this pattern.
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if (++replIdx >= replLen) {
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// $ was at the end of the replacement string. Dump it out and be done.
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dest.append(c);
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break;
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}
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int32_t numDigits = 0;
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int32_t groupNum = 0;
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for (;;) {
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c = replacement.charAt(replIdx);
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if (u_isdigit(c) == FALSE) {
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break;
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}
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groupNum=groupNum*10 + u_charDigitValue(c);
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numDigits++;
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if (++replIdx >= replLen) {
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break;
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}
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if (numDigits >= fPattern->fMaxCaptureDigits) {
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break;
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}
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}
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// We've scanned one char ahead in the pattern. Back up so the
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// next iteration of the loop picks the char again.
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--replIdx;
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if (numDigits == 0) {
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// The $ didn't introduce a group number at all.
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// Treat it as just part of the substitution text.
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dest.append(DOLLARSIGN);
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continue;
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}
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// Finally, append the capture group data to the destination.
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dest.append(group(groupNum, status));
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if (U_FAILURE(status)) {
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// Can fail if group number is out of range.
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return *this;
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}
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}
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return *this;
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}
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//--------------------------------------------------------------------------------
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//
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// appendTail Intended to be used in conjunction with appendReplacement()
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// To the destination string, append everything following
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// the last match position from the input string.
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//
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//--------------------------------------------------------------------------------
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UnicodeString &RegexMatcher::appendTail(UnicodeString &dest) {
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int32_t len = fInputLength-fMatchEnd;
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if (len > 0) {
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dest.append(*fInput, fMatchEnd, len);
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}
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return dest;
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}
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//--------------------------------------------------------------------------------
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//
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// end
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//
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//--------------------------------------------------------------------------------
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int32_t RegexMatcher::end(UErrorCode &err) const {
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return end(0, err);
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}
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int32_t RegexMatcher::end(int group, UErrorCode &err) const {
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if (U_FAILURE(err)) {
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return -1;
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}
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if (fMatch == FALSE) {
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err = U_REGEX_INVALID_STATE;
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return -1;
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}
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if (group < 0 || group > fPattern->fNumCaptureGroups) {
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err = U_INDEX_OUTOFBOUNDS_ERROR;
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return -1;
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}
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int32_t e = -1;
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if (group == 0) {
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e = fMatchEnd;
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} else {
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// Note: When the match engine backs out of a capture group, it sets the
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// group's start position to -1. The end position is left with junk.
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// So, before returning an end position, we must first check that
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// the start position indicates that the group matched something.
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int32_t s = fCaptureStarts->elementAti(group);
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if (s != -1) {
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e = fCaptureEnds->elementAti(group);
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}
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}
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return e;
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}
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//--------------------------------------------------------------------------------
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//
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// find()
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//
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//--------------------------------------------------------------------------------
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UBool RegexMatcher::find() {
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// Start at the position of the last match end. (Will be zero if the
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// matcher has been reset.
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UErrorCode status = U_ZERO_ERROR;
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int32_t startPos;
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for (startPos=fMatchEnd; startPos < fInputLength; startPos++) {
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MatchAt(startPos, status);
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if (U_FAILURE(status)) {
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return FALSE;
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}
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if (fMatch) {
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return TRUE;
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}
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}
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return FALSE;
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}
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UBool RegexMatcher::find(int32_t start, UErrorCode &status) {
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if (U_FAILURE(status)) {
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return FALSE;
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}
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if (start < 0 || start >= fInputLength) {
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status = U_INDEX_OUTOFBOUNDS_ERROR;
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return FALSE;
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}
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this->reset();
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// TODO: optimize a search for the first char of a possible match.
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// TODO: optimize the search for a leading literal string.
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// TODO: optimize based on the minimum length of a possible match
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int32_t startPos;
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for (startPos=start; startPos < fInputLength; startPos++) {
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MatchAt(startPos, status);
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if (U_FAILURE(status)) {
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return FALSE;
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}
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if (fMatch) {
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return TRUE;
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}
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}
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return FALSE;
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}
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//--------------------------------------------------------------------------------
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//
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// group()
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//
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//--------------------------------------------------------------------------------
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UnicodeString RegexMatcher::group(UErrorCode &status) const {
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return group(0, status);
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}
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UnicodeString RegexMatcher::group(int32_t group, UErrorCode &status) const {
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int32_t s = start(group, status);
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int32_t e = end(group, status);
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if (U_FAILURE(status)) {
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return UnicodeString();
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}
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if (s < 0 || s >= e) {
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// Possible cases when a capture group didn't match
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// TODO: firgure out what non-matching capture groups really are supposed to do.
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return UnicodeString();
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}
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return UnicodeString(*fInput, s, e-s);
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}
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int32_t RegexMatcher::groupCount() const {
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return fPattern->fNumCaptureGroups;
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}
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const UnicodeString &RegexMatcher::input() const {
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return *fInput;
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}
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UBool RegexMatcher::lookingAt(UErrorCode &status) {
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if (U_FAILURE(status)) {
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return FALSE;
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}
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reset();
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MatchAt(0, status);
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return fMatch;
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}
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UBool RegexMatcher::matches(UErrorCode &status) {
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if (U_FAILURE(status)) {
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return FALSE;
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}
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reset();
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MatchAt(0, status);
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UBool success = (fMatch && fMatchEnd==fInputLength);
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return success;
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}
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const RegexPattern &RegexMatcher::pattern() const {
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return *fPattern;
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}
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//--------------------------------------------------------------------------------
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//
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// replaceAll
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//
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//--------------------------------------------------------------------------------
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UnicodeString RegexMatcher::replaceAll(const UnicodeString &replacement, UErrorCode &status) {
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if (U_FAILURE(status)) {
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return *fInput;
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}
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UnicodeString destString;
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for (reset(); find(); ) {
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appendReplacement(destString, replacement, status);
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}
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appendTail(destString);
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return destString;
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}
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//--------------------------------------------------------------------------------
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//
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// replaceFirst
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//
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//--------------------------------------------------------------------------------
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UnicodeString RegexMatcher::replaceFirst(const UnicodeString &replacement, UErrorCode &status) {
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if (U_FAILURE(status)) {
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return *fInput;
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}
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reset();
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if (!find()) {
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return *fInput;
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}
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UnicodeString destString;
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appendReplacement(destString, replacement, status);
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appendTail(destString);
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return destString;
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}
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//--------------------------------------------------------------------------------
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//
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// reset
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//
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//--------------------------------------------------------------------------------
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RegexMatcher &RegexMatcher::reset() {
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fMatchStart = 0;
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fMatchEnd = 0;
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fLastMatchEnd = 0;
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fMatch = FALSE;
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int i;
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for (i=0; i<=fPattern->fNumCaptureGroups; i++) {
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fCaptureStarts->setElementAt(-1, i);
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}
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return *this;
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}
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RegexMatcher &RegexMatcher::reset(const UnicodeString &input) {
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fInput = &input;
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fInputLength = input.length();
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reset();
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return *this;
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}
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int32_t RegexMatcher::start(UErrorCode &err) const {
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return start(0, err);
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}
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int32_t RegexMatcher::start(int group, UErrorCode &err) const {
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if (U_FAILURE(err)) {
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return -1;
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}
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if (fMatch == FALSE) {
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err = U_REGEX_INVALID_STATE;
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return -1;
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}
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if (group < 0 || group > fPattern->fNumCaptureGroups) {
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err = U_INDEX_OUTOFBOUNDS_ERROR;
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return -1;
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}
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int32_t s;
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if (group == 0) {
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s = fMatchStart;
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} else {
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s = fCaptureStarts->elementAti(group);
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// TODO: what to do if no match on this specific group?
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}
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return s;
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}
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//--------------------------------------------------------------------------------
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//
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// isWordBoundary
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// in perl, "xab..cd..", \b is true at positions 0,3,5,7
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// For us,
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// If the current char is a combining mark, \b is FALSE
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// Scan backwards to the first non-combining char
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// Pos is a boundary if the current and previous chars are
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// opposite in membership in \w set
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//
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//--------------------------------------------------------------------------------
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UBool RegexMatcher::isWordBoundary(int32_t pos) {
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UBool isBoundary = FALSE;
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if (pos >= fInputLength) {
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// off end of string. Not a boundary.
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return FALSE;
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}
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// Determine whether char c at Pos is a member of the word set of chars.
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UChar32 c = fInput->char32At(pos);
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int8_t ctype = u_charType(c);
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if (ctype==U_NON_SPACING_MARK || ctype==U_ENCLOSING_MARK) {
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// Current char is a combining one. Not a boundary.
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return FALSE;
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}
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UBool cIsWord = fPattern->fStaticSets[URX_ISWORD_SET]->contains(c);
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// Back up until we come to a non-combining char, determine whether
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// that char is a word char.
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UBool prevCIsWord = FALSE;
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int32_t prevPos = pos;
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for (;;) {
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if (prevPos == 0) {
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break;
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}
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prevPos = fInput->moveIndex32(prevPos, -1);
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UChar32 prevChar = fInput->char32At(prevPos);
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int8_t prevCType = u_charType(prevChar);
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if (!(prevCType==U_NON_SPACING_MARK || prevCType==U_ENCLOSING_MARK)) {
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prevCIsWord = fPattern->fStaticSets[URX_ISWORD_SET]->contains(prevChar);
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break;
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}
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}
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isBoundary = cIsWord ^ prevCIsWord;
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return isBoundary;
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}
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//--------------------------------------------------------------------------------
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//
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// getCaptureText We have encountered a '\' that might preceed a
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// capture group specification.
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// If a valid capture group number follows the '\',
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// return the indicies to the start & end of the captured
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// text, and update the patIdx to the position following the
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// \n sequence.
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//
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// This function is used during find and replace operations when
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// processing caputure references in the replacement text.
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//
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//--------------------------------------------------------------------------------
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UBool RegexMatcher::getCaptureText(const UnicodeString &rep,
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int32_t &repIdx,
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int32_t &textStart,
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int32_t &textEnd)
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{
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return FALSE;
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}
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//--------------------------------------------------------------------------------
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//
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// backTrack Within the match engine, this function is called when
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// a local match failure occurs, and the match needs to back
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// track and proceed down another path.
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//
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// Note: Inline function. Keep its body above MatchAt().
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//
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//--------------------------------------------------------------------------------
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void RegexMatcher::backTrack(int32_t &inputIdx, int32_t &patIdx) {
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inputIdx = fBackTrackStack->popi();
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patIdx = fBackTrackStack->popi();
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int i;
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for (i=1; i<=fPattern->fNumCaptureGroups; i++) {
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int32_t cge = fBackTrackStack->popi();
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fCaptureEnds->setElementAt(cge, i);
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int32_t cgs = fBackTrackStack->popi();
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fCaptureStarts->setElementAt(cgs, i);
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}
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}
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//--------------------------------------------------------------------------------
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//
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// MatchAt This is the actual matching engine.
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//
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//--------------------------------------------------------------------------------
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void RegexMatcher::MatchAt(int32_t startIdx, UErrorCode &status) {
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int32_t inputIdx = startIdx; // Current position in the input string.
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int32_t patIdx = 0; // Current position in the compiled pattern.
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UBool isMatch = FALSE; // True if the we have a match.
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int32_t op; // Operation from the compiled pattern, split into
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int32_t opType; // the opcode
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int32_t opValue; // and the operand value.
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if (U_FAILURE(status)) {
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return;
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}
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// Clear out capture results from any previous match.
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// Needed to clear capture groups in patterns with | operations that may not match at all,
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// although the pattern as a whole does match.
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int i;
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for (i=0; i<=fPattern->fNumCaptureGroups; i++) {
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fCaptureStarts->setElementAt(-1, i);
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}
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// Cache frequently referenced items from the compiled pattern
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// in local variables.
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//
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UVector *pat = fPattern->fCompiledPat;
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const UnicodeString *litText = &fPattern->fLiteralText;
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UVector *sets = fPattern->fSets;
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//
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// Main loop for interpreting the compiled pattern.
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// One iteration of the loop per pattern operation performed.
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//
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for (;;) {
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op = pat->elementAti(patIdx);
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opType = URX_TYPE(op);
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opValue = URX_VAL(op);
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// printf("%d %d \"%c\"\n", patIdx, inputIdx, fInput->char32At(inputIdx));
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patIdx++;
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switch (opType) {
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case URX_NOP:
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break;
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case URX_ONECHAR:
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{
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UChar32 inputChar = fInput->char32At(inputIdx);
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if (inputChar == opValue) {
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// TODO: handle the bogus 0xffff return from char32At for index out of range.
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inputIdx = fInput->moveIndex32(inputIdx, 1);
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} else {
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// No match. Back up matching to a saved state
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backTrack(inputIdx, patIdx);
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}
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break;
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}
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|
|
case URX_STRING:
|
|
{
|
|
int32_t stringStartIdx, stringLen;
|
|
stringStartIdx = opValue;
|
|
|
|
op = pat->elementAti(patIdx);
|
|
patIdx++;
|
|
opType = URX_TYPE(op);
|
|
opValue = URX_VAL(op);
|
|
U_ASSERT(opType == URX_STRING_LEN);
|
|
stringLen = opValue;
|
|
|
|
if (fInput->compareBetween(inputIdx,
|
|
inputIdx+stringLen,
|
|
*litText,
|
|
stringStartIdx,
|
|
stringStartIdx+stringLen) == 0)
|
|
{
|
|
inputIdx += stringLen;
|
|
} else {
|
|
// No match. Back up matching to a saved state
|
|
backTrack(inputIdx, patIdx);
|
|
}
|
|
}
|
|
break;
|
|
|
|
|
|
|
|
case URX_STATE_SAVE:
|
|
// Save the state of all capture groups, the pattern continuation
|
|
// postion and the input position.
|
|
{
|
|
int i;
|
|
for (i=fPattern->fNumCaptureGroups; i>0; i--) {
|
|
fBackTrackStack->push(fCaptureStarts->elementAt(i), status);
|
|
fBackTrackStack->push(fCaptureEnds->elementAt(i), status);
|
|
}
|
|
fBackTrackStack->push(opValue, status); // pattern continuation position
|
|
fBackTrackStack->push(inputIdx, status); // current input position
|
|
}
|
|
break;
|
|
|
|
|
|
case URX_END:
|
|
// The match loop will exit via this path on a successful match,
|
|
// when we reach the end of the pattern.
|
|
isMatch = TRUE;
|
|
goto breakFromLoop;
|
|
|
|
case URX_START_CAPTURE:
|
|
U_ASSERT(opValue > 0 && opValue <= fPattern->fNumCaptureGroups);
|
|
fCaptureStarts->setElementAt(inputIdx, opValue);
|
|
fCaptureEnds ->setElementAt((int32_t)0, opValue);
|
|
break;
|
|
|
|
|
|
case URX_END_CAPTURE:
|
|
U_ASSERT(opValue > 0 && opValue <= fPattern->fNumCaptureGroups);
|
|
fCaptureEnds->setElementAt(inputIdx, opValue);
|
|
break;
|
|
|
|
case URX_BACKSLASH_A: // Test for start of input
|
|
if (inputIdx != 0) {
|
|
backTrack(inputIdx, patIdx);
|
|
}
|
|
break;
|
|
|
|
case URX_BACKSLASH_B: // Test for word boundaries
|
|
{
|
|
UBool success = isWordBoundary(inputIdx);
|
|
success ^= (opValue != 0); // flip sense for \B
|
|
if (!success) {
|
|
backTrack(inputIdx, patIdx);
|
|
}
|
|
}
|
|
break;
|
|
|
|
|
|
case URX_BACKSLASH_D:
|
|
{
|
|
if (inputIdx >= fInputLength) {
|
|
backTrack(inputIdx, patIdx);
|
|
break;
|
|
}
|
|
|
|
UChar32 c = fInput->char32At(inputIdx);
|
|
int8_t ctype = u_charType(c);
|
|
UBool success = (ctype == U_DECIMAL_DIGIT_NUMBER);
|
|
success ^= (opValue != 0);
|
|
if (success) {
|
|
inputIdx = fInput->moveIndex32(inputIdx, 1);
|
|
} else {
|
|
backTrack(inputIdx, patIdx);
|
|
}
|
|
}
|
|
break;
|
|
|
|
|
|
|
|
|
|
case URX_BACKSLASH_G: // Test for position at end of previous match
|
|
if (!((fMatch && inputIdx==fMatchEnd) || fMatch==FALSE && inputIdx==0)) {
|
|
backTrack(inputIdx, patIdx);
|
|
}
|
|
break;
|
|
|
|
|
|
case URX_BACKSLASH_X: // Match combining character sequence
|
|
if (FALSE) {
|
|
backTrack(inputIdx, patIdx);
|
|
}
|
|
break;
|
|
|
|
case URX_BACKSLASH_Z: // Test for end of line
|
|
if (FALSE) {
|
|
backTrack(inputIdx, patIdx);
|
|
}
|
|
break;
|
|
|
|
|
|
|
|
case URX_STATIC_SETREF:
|
|
{
|
|
// Test input character against one of the predefined sets
|
|
// (Word Characters, for example)
|
|
// The high bit of the op value is a flag for the match polarity.
|
|
// 0: success if input char is in set.
|
|
// 1: success if input char is not in set.
|
|
UBool success = ((opValue & URX_NEG_SET) == URX_NEG_SET);
|
|
opValue &= ~URX_NEG_SET;
|
|
if (inputIdx < fInputLength) {
|
|
// There is input left. Pick up one char and test it for set membership.
|
|
UChar32 c = fInput->char32At(inputIdx);
|
|
U_ASSERT(opValue > 0 && opValue < URX_LAST_SET);
|
|
const UnicodeSet *s = fPattern->fStaticSets[opValue];
|
|
if (s->contains(c)) {
|
|
success = !success;
|
|
}
|
|
}
|
|
if (success) {
|
|
inputIdx = fInput->moveIndex32(inputIdx, 1);
|
|
} else {
|
|
backTrack(inputIdx, patIdx);
|
|
}
|
|
}
|
|
break;
|
|
|
|
|
|
case URX_SETREF:
|
|
if (inputIdx < fInputLength) {
|
|
// There is input left. Pick up one char and test it for set membership.
|
|
UChar32 c = fInput->char32At(inputIdx);
|
|
U_ASSERT(opValue > 0 && opValue < sets->size());
|
|
UnicodeSet *s = (UnicodeSet *)sets->elementAt(opValue);
|
|
if (s->contains(c)) {
|
|
// The character is in the set. A Match.
|
|
inputIdx = fInput->moveIndex32(inputIdx, 1);
|
|
break;
|
|
}
|
|
}
|
|
// Either at end of input, or the character wasn't in the set.
|
|
// Either way, we need to back track out.
|
|
backTrack(inputIdx, patIdx);
|
|
break;
|
|
|
|
|
|
case URX_DOTANY:
|
|
{
|
|
// . matches anything
|
|
if (inputIdx >= fInputLength) {
|
|
// At end of input. Match failed. Backtrack out.
|
|
backTrack(inputIdx, patIdx);
|
|
break;
|
|
}
|
|
// There is input left. Advance over one char, unless we've hit end-of-line
|
|
UChar32 c = fInput->char32At(inputIdx);
|
|
inputIdx = fInput->moveIndex32(inputIdx, 1);
|
|
if (c == 0x0a || c==0x0d || c==0x0c || c==0x85 ||c==0x2028 || c==0x2029) {
|
|
// End of line in normal mode. . does not match.
|
|
backTrack(inputIdx, patIdx);
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
|
|
|
|
case URX_DOTANY_ALL:
|
|
{
|
|
// ., in dot-matches-all (including new lines) mode
|
|
// . matches anything
|
|
if (inputIdx >= fInputLength) {
|
|
// At end of input. Match failed. Backtrack out.
|
|
backTrack(inputIdx, patIdx);
|
|
break;
|
|
}
|
|
// There is input left. Advance over one char, unless we've hit end-of-line
|
|
UChar32 c = fInput->char32At(inputIdx);
|
|
inputIdx = fInput->moveIndex32(inputIdx, 1);
|
|
if (c == 0x0a || c==0x0d || c==0x0c || c==0x85 ||c==0x2028 || c==0x2029) {
|
|
// In the case of a CR/LF, we need to advance over both.
|
|
UChar32 nextc = fInput->char32At(inputIdx);
|
|
if (c == 0x0d && nextc == 0x0a) {
|
|
inputIdx = fInput->moveIndex32(inputIdx, 1);
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
|
|
case URX_JMP:
|
|
patIdx = opValue;
|
|
break;
|
|
|
|
case URX_FAIL:
|
|
isMatch = FALSE;
|
|
goto breakFromLoop;
|
|
|
|
|
|
default:
|
|
// Trouble. The compiled pattern contains an entry with an
|
|
// unrecognized type tag.
|
|
U_ASSERT(FALSE);
|
|
}
|
|
|
|
if (U_FAILURE(status)) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
breakFromLoop:
|
|
fMatch = isMatch;
|
|
if (isMatch) {
|
|
fLastMatchEnd = fMatchEnd;
|
|
fMatchStart = startIdx;
|
|
fMatchEnd = inputIdx;
|
|
}
|
|
return;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
const char RegexMatcher::fgClassID = 0;
|
|
|
|
U_NAMESPACE_END
|
|
|
|
|