зеркало из https://github.com/mozilla/gecko-dev.git
754 строки
16 KiB
C++
754 строки
16 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "Tokenizer.h"
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#include "nsUnicharUtils.h"
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#include <algorithm>
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namespace mozilla {
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static const char sWhitespaces[] = " \t";
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Tokenizer::Tokenizer(const nsACString& aSource,
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const char* aWhitespaces,
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const char* aAdditionalWordChars)
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: TokenizerBase(aWhitespaces, aAdditionalWordChars)
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{
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mInputFinished = true;
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aSource.BeginReading(mCursor);
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mRecord = mRollback = mCursor;
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aSource.EndReading(mEnd);
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}
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Tokenizer::Tokenizer(const char* aSource,
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const char* aWhitespaces,
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const char* aAdditionalWordChars)
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: Tokenizer(nsDependentCString(aSource), aWhitespaces, aAdditionalWordChars)
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{
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}
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bool
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Tokenizer::Next(Token& aToken)
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{
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if (!HasInput()) {
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mHasFailed = true;
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return false;
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}
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mRollback = mCursor;
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mCursor = Parse(aToken);
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AssignFragment(aToken, mRollback, mCursor);
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mPastEof = aToken.Type() == TOKEN_EOF;
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mHasFailed = false;
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return true;
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}
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bool
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Tokenizer::Check(const TokenType aTokenType, Token& aResult)
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{
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if (!HasInput()) {
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mHasFailed = true;
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return false;
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}
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nsACString::const_char_iterator next = Parse(aResult);
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if (aTokenType != aResult.Type()) {
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mHasFailed = true;
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return false;
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}
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mRollback = mCursor;
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mCursor = next;
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AssignFragment(aResult, mRollback, mCursor);
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mPastEof = aResult.Type() == TOKEN_EOF;
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mHasFailed = false;
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return true;
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}
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bool
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Tokenizer::Check(const Token& aToken)
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{
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if (!HasInput()) {
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mHasFailed = true;
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return false;
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}
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Token parsed;
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nsACString::const_char_iterator next = Parse(parsed);
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if (!aToken.Equals(parsed)) {
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mHasFailed = true;
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return false;
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}
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mRollback = mCursor;
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mCursor = next;
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mPastEof = parsed.Type() == TOKEN_EOF;
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mHasFailed = false;
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return true;
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}
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void
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Tokenizer::SkipWhites(WhiteSkipping aIncludeNewLines)
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{
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if (!CheckWhite() && (aIncludeNewLines == DONT_INCLUDE_NEW_LINE || !CheckEOL())) {
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return;
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}
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nsACString::const_char_iterator rollback = mRollback;
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while (CheckWhite() || (aIncludeNewLines == INCLUDE_NEW_LINE && CheckEOL())) {
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}
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mHasFailed = false;
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mRollback = rollback;
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}
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void
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Tokenizer::SkipUntil(Token const& aToken)
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{
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nsACString::const_char_iterator rollback = mCursor;
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const Token eof = Token::EndOfFile();
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Token t;
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while (Next(t)) {
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if (aToken.Equals(t) || eof.Equals(t)) {
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Rollback();
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break;
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}
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}
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mRollback = rollback;
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}
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bool
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Tokenizer::CheckChar(bool (*aClassifier)(const char aChar))
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{
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if (!aClassifier) {
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MOZ_ASSERT(false);
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return false;
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}
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if (!HasInput() || mCursor == mEnd) {
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mHasFailed = true;
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return false;
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}
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if (!aClassifier(*mCursor)) {
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mHasFailed = true;
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return false;
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}
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mRollback = mCursor;
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++mCursor;
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mHasFailed = false;
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return true;
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}
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bool
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Tokenizer::ReadChar(char* aValue)
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{
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MOZ_RELEASE_ASSERT(aValue);
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Token t;
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if (!Check(TOKEN_CHAR, t)) {
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return false;
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}
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*aValue = t.AsChar();
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return true;
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}
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bool
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Tokenizer::ReadChar(bool (*aClassifier)(const char aChar), char* aValue)
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{
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MOZ_RELEASE_ASSERT(aValue);
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if (!CheckChar(aClassifier)) {
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return false;
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}
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*aValue = *mRollback;
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return true;
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}
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bool
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Tokenizer::ReadWord(nsACString& aValue)
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{
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Token t;
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if (!Check(TOKEN_WORD, t)) {
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return false;
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}
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aValue.Assign(t.AsString());
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return true;
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}
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bool
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Tokenizer::ReadWord(nsDependentCSubstring& aValue)
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{
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Token t;
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if (!Check(TOKEN_WORD, t)) {
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return false;
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}
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aValue.Rebind(t.AsString().BeginReading(), t.AsString().Length());
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return true;
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}
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bool
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Tokenizer::ReadUntil(Token const& aToken, nsACString& aResult, ClaimInclusion aInclude)
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{
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nsDependentCSubstring substring;
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bool rv = ReadUntil(aToken, substring, aInclude);
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aResult.Assign(substring);
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return rv;
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}
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bool
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Tokenizer::ReadUntil(Token const& aToken, nsDependentCSubstring& aResult, ClaimInclusion aInclude)
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{
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nsACString::const_char_iterator record = mRecord;
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Record();
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nsACString::const_char_iterator rollback = mRollback = mCursor;
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bool found = false;
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Token t;
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while (Next(t)) {
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if (aToken.Equals(t)) {
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found = true;
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break;
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}
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if (t.Equals(Token::EndOfFile())) {
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// We don't want to eat it.
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Rollback();
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break;
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}
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}
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Claim(aResult, aInclude);
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mRollback = rollback;
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mRecord = record;
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return found;
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}
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void
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Tokenizer::Rollback()
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{
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MOZ_ASSERT(mCursor > mRollback || mPastEof,
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"Tokenizer::Rollback() cannot use twice or before any parsing");
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mPastEof = false;
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mHasFailed = false;
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mCursor = mRollback;
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}
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void
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Tokenizer::Record(ClaimInclusion aInclude)
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{
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mRecord = aInclude == INCLUDE_LAST
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? mRollback
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: mCursor;
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}
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void
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Tokenizer::Claim(nsACString& aResult, ClaimInclusion aInclusion)
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{
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nsACString::const_char_iterator close = aInclusion == EXCLUDE_LAST
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? mRollback
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: mCursor;
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aResult.Assign(Substring(mRecord, close));
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}
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void
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Tokenizer::Claim(nsDependentCSubstring& aResult, ClaimInclusion aInclusion)
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{
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nsACString::const_char_iterator close = aInclusion == EXCLUDE_LAST
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? mRollback
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: mCursor;
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MOZ_RELEASE_ASSERT(close >= mRecord, "Overflow!");
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aResult.Rebind(mRecord, close - mRecord);
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}
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// TokenizerBase
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TokenizerBase::TokenizerBase(const char* aWhitespaces,
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const char* aAdditionalWordChars)
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: mPastEof(false)
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, mHasFailed(false)
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, mInputFinished(true)
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, mMode(Mode::FULL)
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, mMinRawDelivery(1024)
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, mWhitespaces(aWhitespaces ? aWhitespaces : sWhitespaces)
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, mAdditionalWordChars(aAdditionalWordChars)
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, mCursor(nullptr)
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, mEnd(nullptr)
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, mNextCustomTokenID(TOKEN_CUSTOM0)
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{
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}
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TokenizerBase::Token
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TokenizerBase::AddCustomToken(const nsACString & aValue,
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ECaseSensitivity aCaseInsensitivity, bool aEnabled)
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{
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MOZ_ASSERT(!aValue.IsEmpty());
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UniquePtr<Token>& t = *mCustomTokens.AppendElement();
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t = MakeUnique<Token>();
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t->mType = static_cast<TokenType>(++mNextCustomTokenID);
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t->mCustomCaseInsensitivity = aCaseInsensitivity;
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t->mCustomEnabled = aEnabled;
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t->mCustom.Assign(aValue);
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return *t;
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}
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void
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TokenizerBase::RemoveCustomToken(Token& aToken)
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{
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if (aToken.mType == TOKEN_UNKNOWN) {
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// Already removed
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return;
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}
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for (UniquePtr<Token> const& custom : mCustomTokens) {
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if (custom->mType == aToken.mType) {
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mCustomTokens.RemoveElement(custom);
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aToken.mType = TOKEN_UNKNOWN;
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return;
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}
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}
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MOZ_ASSERT(false, "Token to remove not found");
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}
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void
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TokenizerBase::EnableCustomToken(Token const& aToken, bool aEnabled)
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{
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if (aToken.mType == TOKEN_UNKNOWN) {
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// Already removed
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return;
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}
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for (UniquePtr<Token> const& custom : mCustomTokens) {
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if (custom->Type() == aToken.Type()) {
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// This effectively destroys the token instance.
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custom->mCustomEnabled = aEnabled;
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return;
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}
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}
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MOZ_ASSERT(false, "Token to change not found");
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}
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void
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TokenizerBase::SetTokenizingMode(Mode aMode)
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{
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mMode = aMode;
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}
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bool
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TokenizerBase::HasFailed() const
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{
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return mHasFailed;
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}
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bool
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TokenizerBase::HasInput() const
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{
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return !mPastEof;
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}
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nsACString::const_char_iterator
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TokenizerBase::Parse(Token& aToken) const
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{
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if (mCursor == mEnd) {
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if (!mInputFinished) {
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return mCursor;
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}
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aToken = Token::EndOfFile();
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return mEnd;
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}
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MOZ_RELEASE_ASSERT(mEnd >= mCursor, "Overflow!");
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nsACString::size_type available = mEnd - mCursor;
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uint32_t longestCustom = 0;
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for (UniquePtr<Token> const& custom : mCustomTokens) {
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if (IsCustom(mCursor, *custom, &longestCustom)) {
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aToken = *custom;
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return mCursor + custom->mCustom.Length();
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}
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}
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if (!mInputFinished && available < longestCustom) {
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// Not enough data to deterministically decide.
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return mCursor;
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}
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nsACString::const_char_iterator next = mCursor;
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if (mMode == Mode::CUSTOM_ONLY) {
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// We have to do a brute-force search for all of the enabled custom
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// tokens.
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while (next < mEnd) {
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++next;
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for (UniquePtr<Token> const& custom : mCustomTokens) {
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if (IsCustom(next, *custom)) {
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aToken = Token::Raw();
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return next;
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}
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}
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}
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if (mInputFinished) {
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// End of the data reached.
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aToken = Token::Raw();
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return next;
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}
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if (longestCustom < available && available > mMinRawDelivery) {
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// We can return some data w/o waiting for either a custom token
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// or call to FinishData() when we leave the tail where all the
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// custom tokens potentially fit, so we can't lose only partially
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// delivered tokens. This preserves reasonable granularity.
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aToken = Token::Raw();
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return mEnd - longestCustom + 1;
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}
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// Not enough data to deterministically decide.
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return mCursor;
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}
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enum State {
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PARSE_INTEGER,
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PARSE_WORD,
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PARSE_CRLF,
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PARSE_LF,
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PARSE_WS,
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PARSE_CHAR,
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} state;
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if (IsWordFirst(*next)) {
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state = PARSE_WORD;
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} else if (IsNumber(*next)) {
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state = PARSE_INTEGER;
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} else if (strchr(mWhitespaces, *next)) { // not UTF-8 friendly?
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state = PARSE_WS;
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} else if (*next == '\r') {
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state = PARSE_CRLF;
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} else if (*next == '\n') {
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state = PARSE_LF;
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} else {
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state = PARSE_CHAR;
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}
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mozilla::CheckedUint64 resultingNumber = 0;
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while (next < mEnd) {
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switch (state) {
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case PARSE_INTEGER:
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// Keep it simple for now
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resultingNumber *= 10;
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resultingNumber += static_cast<uint64_t>(*next - '0');
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++next;
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if (IsPending(next)) {
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break;
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}
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if (IsEnd(next) || !IsNumber(*next)) {
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if (!resultingNumber.isValid()) {
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aToken = Token::Error();
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} else {
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aToken = Token::Number(resultingNumber.value());
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}
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return next;
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}
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break;
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case PARSE_WORD:
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++next;
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if (IsPending(next)) {
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break;
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}
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if (IsEnd(next) || !IsWord(*next)) {
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aToken = Token::Word(Substring(mCursor, next));
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return next;
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}
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break;
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case PARSE_CRLF:
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++next;
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if (IsPending(next)) {
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break;
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}
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if (!IsEnd(next) && *next == '\n') { // LF is optional
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++next;
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}
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aToken = Token::NewLine();
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return next;
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case PARSE_LF:
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++next;
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aToken = Token::NewLine();
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return next;
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case PARSE_WS:
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++next;
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aToken = Token::Whitespace();
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return next;
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case PARSE_CHAR:
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++next;
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aToken = Token::Char(*mCursor);
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return next;
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} // switch (state)
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} // while (next < end)
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MOZ_ASSERT(!mInputFinished);
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return mCursor;
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}
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bool
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TokenizerBase::IsEnd(const nsACString::const_char_iterator& caret) const
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{
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return caret == mEnd;
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}
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bool
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TokenizerBase::IsPending(const nsACString::const_char_iterator& caret) const
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{
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return IsEnd(caret) && !mInputFinished;
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}
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bool
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TokenizerBase::IsWordFirst(const char aInput) const
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{
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// TODO: make this fully work with unicode
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return (ToLowerCase(static_cast<uint32_t>(aInput)) !=
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ToUpperCase(static_cast<uint32_t>(aInput))) ||
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'_' == aInput ||
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(mAdditionalWordChars ? !!strchr(mAdditionalWordChars, aInput) : false);
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}
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bool
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TokenizerBase::IsWord(const char aInput) const
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{
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return IsWordFirst(aInput) || IsNumber(aInput);
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}
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bool
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TokenizerBase::IsNumber(const char aInput) const
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{
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// TODO: are there unicode numbers?
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return aInput >= '0' && aInput <= '9';
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}
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bool
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TokenizerBase::IsCustom(const nsACString::const_char_iterator & caret,
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const Token & aCustomToken,
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uint32_t * aLongest) const
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{
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MOZ_ASSERT(aCustomToken.mType > TOKEN_CUSTOM0);
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if (!aCustomToken.mCustomEnabled) {
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return false;
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}
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if (aLongest) {
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*aLongest = std::max(*aLongest, aCustomToken.mCustom.Length());
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}
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// This is not very likely to happen according to how we call this method
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// and since it's on a hot path, it's just a diagnostic assert,
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// not a release assert.
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MOZ_DIAGNOSTIC_ASSERT(mEnd >= caret, "Overflow?");
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uint32_t inputLength = mEnd - caret;
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if (aCustomToken.mCustom.Length() > inputLength) {
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return false;
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}
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nsDependentCSubstring inputFragment(caret, aCustomToken.mCustom.Length());
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if (aCustomToken.mCustomCaseInsensitivity == CASE_INSENSITIVE) {
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return inputFragment.Equals(aCustomToken.mCustom, nsCaseInsensitiveUTF8StringComparator());
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}
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return inputFragment.Equals(aCustomToken.mCustom);
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}
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void TokenizerBase::AssignFragment(Token& aToken,
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nsACString::const_char_iterator begin,
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nsACString::const_char_iterator end)
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{
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aToken.AssignFragment(begin, end);
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}
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// TokenizerBase::Token
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TokenizerBase::Token::Token()
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: mType(TOKEN_UNKNOWN)
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, mChar(0)
|
|
, mInteger(0)
|
|
, mCustomCaseInsensitivity(CASE_SENSITIVE)
|
|
, mCustomEnabled(false)
|
|
{
|
|
}
|
|
|
|
TokenizerBase::Token::Token(const Token& aOther)
|
|
: mType(aOther.mType)
|
|
, mCustom(aOther.mCustom)
|
|
, mChar(aOther.mChar)
|
|
, mInteger(aOther.mInteger)
|
|
, mCustomCaseInsensitivity(aOther.mCustomCaseInsensitivity)
|
|
, mCustomEnabled(aOther.mCustomEnabled)
|
|
{
|
|
if (mType == TOKEN_WORD || mType > TOKEN_CUSTOM0) {
|
|
mWord.Rebind(aOther.mWord.BeginReading(), aOther.mWord.Length());
|
|
}
|
|
}
|
|
|
|
TokenizerBase::Token&
|
|
TokenizerBase::Token::operator=(const Token& aOther)
|
|
{
|
|
mType = aOther.mType;
|
|
mCustom = aOther.mCustom;
|
|
mChar = aOther.mChar;
|
|
mWord.Rebind(aOther.mWord.BeginReading(), aOther.mWord.Length());
|
|
mInteger = aOther.mInteger;
|
|
mCustomCaseInsensitivity = aOther.mCustomCaseInsensitivity;
|
|
mCustomEnabled = aOther.mCustomEnabled;
|
|
return *this;
|
|
}
|
|
|
|
void
|
|
TokenizerBase::Token::AssignFragment(nsACString::const_char_iterator begin,
|
|
nsACString::const_char_iterator end)
|
|
{
|
|
MOZ_RELEASE_ASSERT(end >= begin, "Overflow!");
|
|
mFragment.Rebind(begin, end - begin);
|
|
}
|
|
|
|
// static
|
|
TokenizerBase::Token
|
|
TokenizerBase::Token::Raw()
|
|
{
|
|
Token t;
|
|
t.mType = TOKEN_RAW;
|
|
return t;
|
|
}
|
|
|
|
// static
|
|
TokenizerBase::Token
|
|
TokenizerBase::Token::Word(const nsACString& aValue)
|
|
{
|
|
Token t;
|
|
t.mType = TOKEN_WORD;
|
|
t.mWord.Rebind(aValue.BeginReading(), aValue.Length());
|
|
return t;
|
|
}
|
|
|
|
// static
|
|
TokenizerBase::Token
|
|
TokenizerBase::Token::Char(const char aValue)
|
|
{
|
|
Token t;
|
|
t.mType = TOKEN_CHAR;
|
|
t.mChar = aValue;
|
|
return t;
|
|
}
|
|
|
|
// static
|
|
TokenizerBase::Token
|
|
TokenizerBase::Token::Number(const uint64_t aValue)
|
|
{
|
|
Token t;
|
|
t.mType = TOKEN_INTEGER;
|
|
t.mInteger = aValue;
|
|
return t;
|
|
}
|
|
|
|
// static
|
|
TokenizerBase::Token
|
|
TokenizerBase::Token::Whitespace()
|
|
{
|
|
Token t;
|
|
t.mType = TOKEN_WS;
|
|
t.mChar = '\0';
|
|
return t;
|
|
}
|
|
|
|
// static
|
|
TokenizerBase::Token
|
|
TokenizerBase::Token::NewLine()
|
|
{
|
|
Token t;
|
|
t.mType = TOKEN_EOL;
|
|
return t;
|
|
}
|
|
|
|
// static
|
|
TokenizerBase::Token
|
|
TokenizerBase::Token::EndOfFile()
|
|
{
|
|
Token t;
|
|
t.mType = TOKEN_EOF;
|
|
return t;
|
|
}
|
|
|
|
// static
|
|
TokenizerBase::Token
|
|
TokenizerBase::Token::Error()
|
|
{
|
|
Token t;
|
|
t.mType = TOKEN_ERROR;
|
|
return t;
|
|
}
|
|
|
|
bool
|
|
TokenizerBase::Token::Equals(const Token& aOther) const
|
|
{
|
|
if (mType != aOther.mType) {
|
|
return false;
|
|
}
|
|
|
|
switch (mType) {
|
|
case TOKEN_INTEGER:
|
|
return AsInteger() == aOther.AsInteger();
|
|
case TOKEN_WORD:
|
|
return AsString() == aOther.AsString();
|
|
case TOKEN_CHAR:
|
|
return AsChar() == aOther.AsChar();
|
|
default:
|
|
return true;
|
|
}
|
|
}
|
|
|
|
char
|
|
TokenizerBase::Token::AsChar() const
|
|
{
|
|
MOZ_ASSERT(mType == TOKEN_CHAR || mType == TOKEN_WS);
|
|
return mChar;
|
|
}
|
|
|
|
nsDependentCSubstring
|
|
TokenizerBase::Token::AsString() const
|
|
{
|
|
MOZ_ASSERT(mType == TOKEN_WORD);
|
|
return mWord;
|
|
}
|
|
|
|
uint64_t
|
|
TokenizerBase::Token::AsInteger() const
|
|
{
|
|
MOZ_ASSERT(mType == TOKEN_INTEGER);
|
|
return mInteger;
|
|
}
|
|
|
|
} // mozilla
|