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/*
* Copyright (C) 2008 Apple Inc. All Rights Reserved.
* Copyright (C) 2009 Torch Mobile, Inc. http://www.torchmobile.com/
* 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.
*/
#include "config.h"
#include "HTMLEntityParser.h"
#include "HTMLEntitySearch.h"
#include "HTMLEntityTable.h"
#include <wtf/Vector.h>
using namespace WTF;
namespace WebCore {
namespace {
static const UChar windowsLatin1ExtensionArray[32] = {
0x20AC, 0x0081, 0x201A, 0x0192, 0x201E, 0x2026, 0x2020, 0x2021, // 80-87
0x02C6, 0x2030, 0x0160, 0x2039, 0x0152, 0x008D, 0x017D, 0x008F, // 88-8F
0x0090, 0x2018, 0x2019, 0x201C, 0x201D, 0x2022, 0x2013, 0x2014, // 90-97
0x02DC, 0x2122, 0x0161, 0x203A, 0x0153, 0x009D, 0x017E, 0x0178, // 98-9F
};
inline UChar adjustEntity(UChar32 value)
{
if ((value & ~0x1F) != 0x0080)
return value;
return windowsLatin1ExtensionArray[value - 0x80];
}
inline UChar32 legalEntityFor(UChar32 value)
{
// FIXME: A number of specific entity values generate parse errors.
if (value == 0 || value > 0x10FFFF || (value >= 0xD800 && value <= 0xDFFF))
return 0xFFFD;
if (U_IS_BMP(value))
return adjustEntity(value);
return value;
}
inline bool convertToUTF16(UChar32 value, Vector<UChar, 16>& decodedEntity)
{
if (U_IS_BMP(value)) {
UChar character = static_cast<UChar>(value);
ASSERT(character == value);
decodedEntity.append(character);
return true;
}
decodedEntity.append(U16_LEAD(value));
decodedEntity.append(U16_TRAIL(value));
return true;
}
inline bool isHexDigit(UChar cc)
{
return (cc >= '0' && cc <= '9') || (cc >= 'a' && cc <= 'f') || (cc >= 'A' && cc <= 'F');
}
inline bool isAlphaNumeric(UChar cc)
{
return (cc >= '0' && cc <= '9') || (cc >= 'a' && cc <= 'z') || (cc >= 'A' && cc <= 'Z');
}
void unconsumeCharacters(SegmentedString& source, const Vector<UChar, 10>& consumedCharacters)
{
if (consumedCharacters.size() == 1)
source.push(consumedCharacters[0]);
else if (consumedCharacters.size() == 2) {
source.push(consumedCharacters[0]);
source.push(consumedCharacters[1]);
} else
source.prepend(SegmentedString(String(consumedCharacters.data(), consumedCharacters.size())));
}
}
bool consumeHTMLEntity(SegmentedString& source, Vector<UChar, 16>& decodedEntity, bool& notEnoughCharacters, UChar additionalAllowedCharacter)
{
ASSERT(!additionalAllowedCharacter || additionalAllowedCharacter == '"' || additionalAllowedCharacter == '\'' || additionalAllowedCharacter == '>');
ASSERT(!notEnoughCharacters);
ASSERT(decodedEntity.isEmpty());
enum EntityState {
Initial,
Number,
MaybeHexLowerCaseX,
MaybeHexUpperCaseX,
Hex,
Decimal,
Named
};
EntityState entityState = Initial;
UChar32 result = 0;
Vector<UChar, 10> consumedCharacters;
while (!source.isEmpty()) {
UChar cc = *source;
switch (entityState) {
case Initial: {
if (cc == '\x09' || cc == '\x0A' || cc == '\x0C' || cc == ' ' || cc == '<' || cc == '&')
return false;
if (additionalAllowedCharacter && cc == additionalAllowedCharacter)
return false;
if (cc == '#') {
entityState = Number;
break;
}
if ((cc >= 'a' && cc <= 'z') || (cc >= 'A' && cc <= 'Z')) {
entityState = Named;
continue;
}
return false;
}
case Number: {
if (cc == 'x') {
entityState = MaybeHexLowerCaseX;
break;
}
if (cc == 'X') {
entityState = MaybeHexUpperCaseX;
break;
}
if (cc >= '0' && cc <= '9') {
entityState = Decimal;
continue;
}
source.push('#');
return false;
}
case MaybeHexLowerCaseX: {
if (isHexDigit(cc)) {
entityState = Hex;
continue;
}
source.push('#');
source.push('x');
return false;
}
case MaybeHexUpperCaseX: {
if (isHexDigit(cc)) {
entityState = Hex;
continue;
}
source.push('#');
source.push('X');
return false;
}
case Hex: {
if (cc >= '0' && cc <= '9')
result = result * 16 + cc - '0';
else if (cc >= 'a' && cc <= 'f')
result = result * 16 + 10 + cc - 'a';
else if (cc >= 'A' && cc <= 'F')
result = result * 16 + 10 + cc - 'A';
else {
if (cc == ';')
source.advanceAndASSERT(cc);
return convertToUTF16(legalEntityFor(result), decodedEntity);
}
break;
}
case Decimal: {
if (cc >= '0' && cc <= '9')
result = result * 10 + cc - '0';
else {
if (cc == ';')
source.advanceAndASSERT(cc);
return convertToUTF16(legalEntityFor(result), decodedEntity);
}
break;
}
case Named: {
HTMLEntitySearch entitySearch;
while (!source.isEmpty()) {
cc = *source;
entitySearch.advance(cc);
if (!entitySearch.isEntityPrefix())
break;
consumedCharacters.append(cc);
source.advanceAndASSERT(cc);
}
notEnoughCharacters = source.isEmpty();
if (notEnoughCharacters) {
// We can't an entity because there might be a longer entity
// that we could match if we had more data.
unconsumeCharacters(source, consumedCharacters);
return false;
}
if (!entitySearch.mostRecentMatch()) {
ASSERT(!entitySearch.currentValue());
unconsumeCharacters(source, consumedCharacters);
return false;
}
if (entitySearch.mostRecentMatch()->length != entitySearch.currentLength()) {
// We've consumed too many characters. We need to walk the
// source back to the point at which we had consumed an
// actual entity.
unconsumeCharacters(source, consumedCharacters);
consumedCharacters.clear();
const int length = entitySearch.mostRecentMatch()->length;
const UChar* reference = entitySearch.mostRecentMatch()->entity;
for (int i = 0; i < length; ++i) {
cc = *source;
ASSERT_UNUSED(reference, cc == *reference++);
consumedCharacters.append(cc);
source.advanceAndASSERT(cc);
ASSERT(!source.isEmpty());
}
cc = *source;
}
if (entitySearch.mostRecentMatch()->lastCharacter() == ';'
|| !additionalAllowedCharacter
|| !(isAlphaNumeric(cc) || cc == '=')) {
return convertToUTF16(entitySearch.mostRecentMatch()->value, decodedEntity);
}
unconsumeCharacters(source, consumedCharacters);
return false;
}
}
consumedCharacters.append(cc);
source.advanceAndASSERT(cc);
}
ASSERT(source.isEmpty());
notEnoughCharacters = true;
unconsumeCharacters(source, consumedCharacters);
return false;
}
UChar decodeNamedEntity(const char* name)
{
HTMLEntitySearch search;
while (*name) {
search.advance(*name++);
if (!search.isEntityPrefix())
return 0;
}
search.advance(';');
UChar32 entityValue = search.currentValue();
if (U16_LENGTH(entityValue) != 1) {
// Callers need to move off this API if the entity table has values
// which do no fit in a 16 bit UChar!
ASSERT_NOT_REACHED();
return 0;
}
return static_cast<UChar>(entityValue);
}
} // namespace WebCore
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