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// Copyright 2014 The Chromium Authors. All rights reserved.
// Copyright (C) 2016 Apple 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:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * 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.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "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 THE COPYRIGHT
// OWNER 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 "CSSParserToken.h"
#include "CSSMarkup.h"
#include "CSSPrimitiveValue.h"
#include "CSSPropertyParser.h"
#include "RuntimeEnabledFeatures.h"
#include <limits.h>
#include <wtf/HexNumber.h>
#include <wtf/text/StringBuilder.h>
namespace WebCore {
template<typename CharacterType>
CSSUnitType cssPrimitiveValueUnitFromTrie(const CharacterType* data, unsigned length)
{
ASSERT(data);
ASSERT(length);
switch (length) {
case 1:
switch (toASCIILower(data[0])) {
case 'q':
return CSSUnitType::CSS_Q;
case 's':
return CSSUnitType::CSS_S;
}
break;
case 2:
switch (toASCIILower(data[0])) {
case 'c':
switch (toASCIILower(data[1])) {
case 'h':
return CSSUnitType::CSS_CHS;
case 'm':
return CSSUnitType::CSS_CM;
}
break;
case 'e':
switch (toASCIILower(data[1])) {
case 'm':
return CSSUnitType::CSS_EMS;
case 'x':
return CSSUnitType::CSS_EXS;
}
break;
case 'f':
if (toASCIILower(data[1]) == 'r')
return CSSUnitType::CSS_FR;
break;
case 'h':
if (toASCIILower(data[1]) == 'z')
return CSSUnitType::CSS_HZ;
break;
case 'i':
if (toASCIILower(data[1]) == 'n')
return CSSUnitType::CSS_IN;
break;
case 'l':
if (toASCIILower(data[1]) == 'h' && RuntimeEnabledFeatures::sharedFeatures().lineHeightUnitsEnabled())
return CSSUnitType::CSS_LHS;
break;
case 'm':
switch (toASCIILower(data[1])) {
case 'm':
return CSSUnitType::CSS_MM;
case 's':
return CSSUnitType::CSS_MS;
}
break;
case 'p':
switch (toASCIILower(data[1])) {
case 'c':
return CSSUnitType::CSS_PC;
case 't':
return CSSUnitType::CSS_PT;
case 'x':
return CSSUnitType::CSS_PX;
}
break;
case 'v':
switch (toASCIILower(data[1])) {
case 'h':
return CSSUnitType::CSS_VH;
case 'w':
return CSSUnitType::CSS_VW;
}
break;
}
break;
case 3:
switch (toASCIILower(data[0])) {
case 'd':
switch (toASCIILower(data[1])) {
case 'e':
if (toASCIILower(data[2]) == 'g')
return CSSUnitType::CSS_DEG;
break;
case 'p':
if (toASCIILower(data[2]) == 'i')
return CSSUnitType::CSS_DPI;
break;
}
break;
case 'k':
if (toASCIILower(data[1]) == 'h' && toASCIILower(data[2]) == 'z')
return CSSUnitType::CSS_KHZ;
break;
case 'r':
switch (toASCIILower(data[1])) {
case 'a':
if (toASCIILower(data[2]) == 'd')
return CSSUnitType::CSS_RAD;
break;
case 'e':
if (toASCIILower(data[2]) == 'm')
return CSSUnitType::CSS_REMS;
break;
case 'l':
if (toASCIILower(data[2]) == 'h' && RuntimeEnabledFeatures::sharedFeatures().lineHeightUnitsEnabled())
return CSSUnitType::CSS_RLHS;
break;
}
break;
}
break;
case 4:
switch (toASCIILower(data[0])) {
case 'd':
switch (toASCIILower(data[1])) {
case 'p':
switch (toASCIILower(data[2])) {
case 'c':
if (toASCIILower(data[3]) == 'm')
return CSSUnitType::CSS_DPCM;
break;
case 'p':
if (toASCIILower(data[3]) == 'x')
return CSSUnitType::CSS_DPPX;
break;
}
break;
}
break;
case 'g':
if (toASCIILower(data[1]) == 'r' && toASCIILower(data[2]) == 'a' && toASCIILower(data[3]) == 'd')
return CSSUnitType::CSS_GRAD;
break;
case 't':
if (toASCIILower(data[1]) == 'u' && toASCIILower(data[2]) == 'r' && toASCIILower(data[3]) == 'n')
return CSSUnitType::CSS_TURN;
break;
case 'v':
switch (toASCIILower(data[1])) {
case 'm':
switch (toASCIILower(data[2])) {
case 'a':
if (toASCIILower(data[3]) == 'x')
return CSSUnitType::CSS_VMAX;
break;
case 'i':
if (toASCIILower(data[3]) == 'n')
return CSSUnitType::CSS_VMIN;
break;
}
break;
}
break;
}
break;
case 5:
switch (toASCIILower(data[0])) {
case '_':
if (toASCIILower(data[1]) == '_' && toASCIILower(data[2]) == 'q' && toASCIILower(data[3]) == 'e' && toASCIILower(data[4]) == 'm')
return CSSUnitType::CSS_QUIRKY_EMS;
break;
}
break;
}
return CSSUnitType::CSS_UNKNOWN;
}
static CSSUnitType stringToUnitType(StringView stringView)
{
if (stringView.is8Bit())
return cssPrimitiveValueUnitFromTrie(stringView.characters8(), stringView.length());
return cssPrimitiveValueUnitFromTrie(stringView.characters16(), stringView.length());
}
CSSParserToken::CSSParserToken(CSSParserTokenType type, BlockType blockType)
: m_type(type)
, m_blockType(blockType)
{
}
// Just a helper used for Delimiter tokens.
CSSParserToken::CSSParserToken(CSSParserTokenType type, UChar c)
: m_type(type)
, m_blockType(NotBlock)
, m_delimiter(c)
{
ASSERT(m_type == DelimiterToken);
}
CSSParserToken::CSSParserToken(CSSParserTokenType type, StringView value, BlockType blockType)
: m_type(type)
, m_blockType(blockType)
{
initValueFromStringView(value);
m_id = -1;
}
CSSParserToken::CSSParserToken(CSSParserTokenType type, double numericValue, NumericValueType numericValueType, NumericSign sign)
: m_type(type)
, m_blockType(NotBlock)
, m_numericValueType(numericValueType)
, m_numericSign(sign)
, m_unit(static_cast<unsigned>(CSSUnitType::CSS_NUMBER))
{
ASSERT(type == NumberToken);
m_numericValue = numericValue;
}
CSSParserToken::CSSParserToken(CSSParserTokenType type, UChar32 start, UChar32 end)
: m_type(UnicodeRangeToken)
, m_blockType(NotBlock)
{
ASSERT_UNUSED(type, type == UnicodeRangeToken);
m_unicodeRange.start = start;
m_unicodeRange.end = end;
}
CSSParserToken::CSSParserToken(HashTokenType type, StringView value)
: m_type(HashToken)
, m_blockType(NotBlock)
, m_hashTokenType(type)
{
initValueFromStringView(value);
}
void CSSParserToken::convertToDimensionWithUnit(StringView unit)
{
ASSERT(m_type == NumberToken);
m_type = DimensionToken;
initValueFromStringView(unit);
m_unit = static_cast<unsigned>(stringToUnitType(unit));
}
void CSSParserToken::convertToPercentage()
{
ASSERT(m_type == NumberToken);
m_type = PercentageToken;
m_unit = static_cast<unsigned>(CSSUnitType::CSS_PERCENTAGE);
}
UChar CSSParserToken::delimiter() const
{
ASSERT(m_type == DelimiterToken);
return m_delimiter;
}
NumericSign CSSParserToken::numericSign() const
{
// This is valid for DimensionToken and PercentageToken, but only used
// in <an+b> parsing on NumberTokens.
ASSERT(m_type == NumberToken);
return static_cast<NumericSign>(m_numericSign);
}
NumericValueType CSSParserToken::numericValueType() const
{
ASSERT(m_type == NumberToken || m_type == PercentageToken || m_type == DimensionToken);
return static_cast<NumericValueType>(m_numericValueType);
}
double CSSParserToken::numericValue() const
{
ASSERT(m_type == NumberToken || m_type == PercentageToken || m_type == DimensionToken);
return m_numericValue;
}
CSSPropertyID CSSParserToken::parseAsCSSPropertyID() const
{
ASSERT(m_type == IdentToken);
return cssPropertyID(value());
}
CSSValueID CSSParserToken::id() const
{
if (m_type != IdentToken)
return CSSValueInvalid;
if (m_id < 0)
m_id = cssValueKeywordID(value());
return static_cast<CSSValueID>(m_id);
}
CSSValueID CSSParserToken::functionId() const
{
if (m_type != FunctionToken)
return CSSValueInvalid;
if (m_id < 0)
m_id = cssValueKeywordID(value());
return static_cast<CSSValueID>(m_id);
}
bool CSSParserToken::hasStringBacking() const
{
CSSParserTokenType tokenType = type();
return tokenType == IdentToken
|| tokenType == FunctionToken
|| tokenType == AtKeywordToken
|| tokenType == HashToken
|| tokenType == UrlToken
|| tokenType == DimensionToken
|| tokenType == StringToken;
}
CSSParserToken CSSParserToken::copyWithUpdatedString(const StringView& string) const
{
CSSParserToken copy(*this);
copy.initValueFromStringView(string);
return copy;
}
bool CSSParserToken::valueDataCharRawEqual(const CSSParserToken& other) const
{
if (m_valueLength != other.m_valueLength)
return false;
if (m_valueDataCharRaw == other.m_valueDataCharRaw && m_valueIs8Bit == other.m_valueIs8Bit)
return true;
if (m_valueIs8Bit)
return other.m_valueIs8Bit ? equal(static_cast<const LChar*>(m_valueDataCharRaw), static_cast<const LChar*>(other.m_valueDataCharRaw), m_valueLength) : equal(static_cast<const LChar*>(m_valueDataCharRaw), static_cast<const UChar*>(other.m_valueDataCharRaw), m_valueLength);
return other.m_valueIs8Bit ? equal(static_cast<const UChar*>(m_valueDataCharRaw), static_cast<const LChar*>(other.m_valueDataCharRaw), m_valueLength) : equal(static_cast<const UChar*>(m_valueDataCharRaw), static_cast<const UChar*>(other.m_valueDataCharRaw), m_valueLength);
}
bool CSSParserToken::operator==(const CSSParserToken& other) const
{
if (m_type != other.m_type)
return false;
switch (m_type) {
case DelimiterToken:
return delimiter() == other.delimiter();
case HashToken:
if (m_hashTokenType != other.m_hashTokenType)
return false;
FALLTHROUGH;
case IdentToken:
case FunctionToken:
case StringToken:
case UrlToken:
return valueDataCharRawEqual(other);
case DimensionToken:
if (!valueDataCharRawEqual(other))
return false;
FALLTHROUGH;
case NumberToken:
case PercentageToken:
return m_numericSign == other.m_numericSign && m_numericValue == other.m_numericValue && m_numericValueType == other.m_numericValueType;
case UnicodeRangeToken:
return m_unicodeRange.start == other.m_unicodeRange.start && m_unicodeRange.end == other.m_unicodeRange.end;
default:
return true;
}
}
void CSSParserToken::serialize(StringBuilder& builder) const
{
// This is currently only used for @supports CSSOM. To keep our implementation
// simple we handle some of the edge cases incorrectly (see comments below).
switch (type()) {
case IdentToken:
serializeIdentifier(value().toString(), builder);
break;
case FunctionToken:
serializeIdentifier(value().toString(), builder);
builder.append('(');
break;
case AtKeywordToken:
builder.append('@');
serializeIdentifier(value().toString(), builder);
break;
case HashToken:
builder.append('#');
serializeIdentifier(value().toString(), builder, (getHashTokenType() == HashTokenUnrestricted));
break;
case UrlToken:
builder.appendLiteral("url(");
serializeIdentifier(value().toString(), builder);
builder.append(')');
break;
case DelimiterToken:
if (delimiter() == '\\') {
builder.appendLiteral("\\\n");
break;
}
builder.append(delimiter());
break;
case NumberToken:
// These won't properly preserve the NumericValueType flag
if (m_numericSign == PlusSign)
builder.append('+');
builder.append(numericValue());
break;
case PercentageToken:
builder.append(numericValue(), '%');
break;
case DimensionToken:
// This will incorrectly serialize e.g. 4e3e2 as 4000e2
builder.append(numericValue());
serializeIdentifier(value().toString(), builder);
break;
case UnicodeRangeToken:
builder.appendLiteral("U+");
builder.append(hex(unicodeRangeStart()));
builder.append('-');
builder.append(hex(unicodeRangeEnd()));
break;
case StringToken:
serializeString(value().toString(), builder);
break;
case IncludeMatchToken:
builder.appendLiteral("~=");
break;
case DashMatchToken:
builder.appendLiteral("|=");
break;
case PrefixMatchToken:
builder.appendLiteral("^=");
break;
case SuffixMatchToken:
builder.appendLiteral("$=");
break;
case SubstringMatchToken:
builder.appendLiteral("*=");
break;
case ColumnToken:
builder.appendLiteral("||");
break;
case CDOToken:
builder.appendLiteral("<!--");
break;
case CDCToken:
builder.appendLiteral("-->");
break;
case BadStringToken:
builder.appendLiteral("'\n");
break;
case BadUrlToken:
builder.appendLiteral("url(()");
break;
case WhitespaceToken:
builder.append(' ');
break;
case ColonToken:
builder.append(':');
break;
case SemicolonToken:
builder.append(';');
break;
case CommaToken:
builder.append(',');
break;
case LeftParenthesisToken:
builder.append('(');
break;
case RightParenthesisToken:
builder.append(')');
break;
case LeftBracketToken:
builder.append('[');
break;
case RightBracketToken:
builder.append(']');
break;
case LeftBraceToken:
builder.append('{');
break;
case RightBraceToken:
builder.append('}');
break;
case EOFToken:
case CommentToken:
ASSERT_NOT_REACHED();
break;
}
}
} // namespace WebCore