| /* |
| * Copyright (C) 2008 Apple Inc. All Rights Reserved. |
| * Copyright (C) 2010 Google, Inc. All Rights Reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #pragma once |
| |
| #include <wtf/text/StringBuilder.h> |
| |
| namespace WebCore { |
| |
| inline void unconsumeCharacters(SegmentedString& source, StringBuilder& consumedCharacters) |
| { |
| source.pushBack(consumedCharacters.toString()); |
| } |
| |
| template <typename ParserFunctions> |
| bool consumeCharacterReference(SegmentedString& source, StringBuilder& decodedCharacter, bool& notEnoughCharacters, UChar additionalAllowedCharacter) |
| { |
| ASSERT(!additionalAllowedCharacter || additionalAllowedCharacter == '"' || additionalAllowedCharacter == '\'' || additionalAllowedCharacter == '>'); |
| ASSERT(!notEnoughCharacters); |
| ASSERT(decodedCharacter.isEmpty()); |
| |
| enum { |
| Initial, |
| Number, |
| MaybeHexLowerCaseX, |
| MaybeHexUpperCaseX, |
| Hex, |
| Decimal, |
| Named |
| } state = Initial; |
| UChar32 result = 0; |
| bool overflow = false; |
| StringBuilder consumedCharacters; |
| |
| while (!source.isEmpty()) { |
| UChar character = source.currentCharacter(); |
| switch (state) { |
| case Initial: |
| if (character == '\x09' || character == '\x0A' || character == '\x0C' || character == ' ' || character == '<' || character == '&') |
| return false; |
| if (additionalAllowedCharacter && character == additionalAllowedCharacter) |
| return false; |
| if (character == '#') { |
| state = Number; |
| break; |
| } |
| if (isASCIIAlpha(character)) { |
| state = Named; |
| goto Named; |
| } |
| return false; |
| case Number: |
| if (character == 'x') { |
| state = MaybeHexLowerCaseX; |
| break; |
| } |
| if (character == 'X') { |
| state = MaybeHexUpperCaseX; |
| break; |
| } |
| if (isASCIIDigit(character)) { |
| state = Decimal; |
| goto Decimal; |
| } |
| source.pushBack("#"_s); |
| return false; |
| case MaybeHexLowerCaseX: |
| if (isASCIIHexDigit(character)) { |
| state = Hex; |
| goto Hex; |
| } |
| source.pushBack("#x"_s); |
| return false; |
| case MaybeHexUpperCaseX: |
| if (isASCIIHexDigit(character)) { |
| state = Hex; |
| goto Hex; |
| } |
| source.pushBack("#X"_s); |
| return false; |
| case Hex: |
| Hex: |
| if (isASCIIHexDigit(character)) { |
| result = result * 16 + toASCIIHexValue(character); |
| if (result > UCHAR_MAX_VALUE) |
| overflow = true; |
| break; |
| } |
| if (character == ';') { |
| source.advancePastNonNewline(); |
| decodedCharacter.append(ParserFunctions::legalEntityFor(overflow ? 0 : result)); |
| return true; |
| } |
| if (ParserFunctions::acceptMalformed()) { |
| decodedCharacter.append(ParserFunctions::legalEntityFor(overflow ? 0 : result)); |
| return true; |
| } |
| unconsumeCharacters(source, consumedCharacters); |
| return false; |
| case Decimal: |
| Decimal: |
| if (isASCIIDigit(character)) { |
| result = result * 10 + character - '0'; |
| if (result > UCHAR_MAX_VALUE) |
| overflow = true; |
| break; |
| } |
| if (character == ';') { |
| source.advancePastNonNewline(); |
| decodedCharacter.append(ParserFunctions::legalEntityFor(overflow ? 0 : result)); |
| return true; |
| } |
| if (ParserFunctions::acceptMalformed()) { |
| decodedCharacter.append(ParserFunctions::legalEntityFor(overflow ? 0 : result)); |
| return true; |
| } |
| unconsumeCharacters(source, consumedCharacters); |
| return false; |
| case Named: |
| Named: |
| return ParserFunctions::consumeNamedEntity(source, decodedCharacter, notEnoughCharacters, additionalAllowedCharacter, character); |
| } |
| consumedCharacters.append(character); |
| source.advancePastNonNewline(); |
| } |
| ASSERT(source.isEmpty()); |
| notEnoughCharacters = true; |
| unconsumeCharacters(source, consumedCharacters); |
| return false; |
| } |
| |
| } // namespace WebCore |