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cobalt / cobalt / 1e13b7264241820b30760ea1a4cf7db0d5c7123b / . / src / cobalt / css_parser / scanner.cc
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// Copyright 2014 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "cobalt/css_parser/scanner.h"
#include <limits>
#include "base/string_util.h"
#include "cobalt/base/compiler.h"
#include "cobalt/css_parser/grammar.h"
#include "cobalt/css_parser/string_pool.h"
#include "cobalt/cssom/character_classification.h"
#include "cobalt/cssom/keyword_names.h"
#include "cobalt/cssom/media_feature_keyword_value_names.h"
#include "cobalt/cssom/media_feature_names.h"
#include "cobalt/cssom/media_type_names.h"
#include "cobalt/cssom/pseudo_class_names.h"
#include "cobalt/cssom/pseudo_element_names.h"
#include "third_party/icu/source/common/unicode/unistr.h"
namespace cobalt {
namespace css_parser {
namespace {
// Types for the main switch.
enum CharacterType {
// The first 4 types must be grouped together, as they
// represent the allowed chars in an identifier.
kCaselessUCharacter,
kIdentifierStartCharacter,
kNumberCharacter,
kDashCharacter,
kOtherCharacter,
kNullCharacter,
kWhitespaceCharacter,
kEndMediaQueryOrSupportsCharacter,
kEndNthChildCharacter,
kQuoteCharacter,
kExclamationMarkCharacter,
kHashmarkCharacter,
kDollarCharacter,
kAsteriskCharacter,
kPlusCharacter,
kDotCharacter,
kSlashCharacter,
kLessCharacter,
kAtCharacter,
kBackSlashCharacter,
kXorCharacter,
kVerticalBarCharacter,
kTildeCharacter,
};
// 128 ASCII codes.
const CharacterType kTypesOfAsciiCharacters[128] = {
/* 0 - Null */ kNullCharacter,
/* 1 - Start of Heading */ kOtherCharacter,
/* 2 - Start of Text */ kOtherCharacter,
/* 3 - End of Text */ kOtherCharacter,
/* 4 - End of Transm. */ kOtherCharacter,
/* 5 - Enquiry */ kOtherCharacter,
/* 6 - Acknowledgment */ kOtherCharacter,
/* 7 - Bell */ kOtherCharacter,
/* 8 - Back Space */ kOtherCharacter,
/* 9 - Horizontal Tab */ kWhitespaceCharacter,
/* 10 - Line Feed */ kWhitespaceCharacter,
/* 11 - Vertical Tab */ kOtherCharacter,
/* 12 - Form Feed */ kWhitespaceCharacter,
/* 13 - Carriage Return */ kWhitespaceCharacter,
/* 14 - Shift Out */ kOtherCharacter,
/* 15 - Shift In */ kOtherCharacter,
/* 16 - Data Line Escape */ kOtherCharacter,
/* 17 - Device Control 1 */ kOtherCharacter,
/* 18 - Device Control 2 */ kOtherCharacter,
/* 19 - Device Control 3 */ kOtherCharacter,
/* 20 - Device Control 4 */ kOtherCharacter,
/* 21 - Negative Ack. */ kOtherCharacter,
/* 22 - Synchronous Idle */ kOtherCharacter,
/* 23 - End of Transmit */ kOtherCharacter,
/* 24 - Cancel */ kOtherCharacter,
/* 25 - End of Medium */ kOtherCharacter,
/* 26 - Substitute */ kOtherCharacter,
/* 27 - Escape */ kOtherCharacter,
/* 28 - File Separator */ kOtherCharacter,
/* 29 - Group Separator */ kOtherCharacter,
/* 30 - Record Separator */ kOtherCharacter,
/* 31 - Unit Separator */ kOtherCharacter,
/* 32 - Space */ kWhitespaceCharacter,
/* 33 - ! */ kExclamationMarkCharacter,
/* 34 - " */ kQuoteCharacter,
/* 35 - # */ kHashmarkCharacter,
/* 36 - $ */ kDollarCharacter,
/* 37 - % */ kOtherCharacter,
/* 38 - & */ kOtherCharacter,
/* 39 - ' */ kQuoteCharacter,
/* 40 - ( */ kOtherCharacter,
/* 41 - ) */ kEndNthChildCharacter,
/* 42 - * */ kAsteriskCharacter,
/* 43 - + */ kPlusCharacter,
/* 44 - , */ kOtherCharacter,
/* 45 - - */ kDashCharacter,
/* 46 - . */ kDotCharacter,
/* 47 - / */ kSlashCharacter,
/* 48 - 0 */ kNumberCharacter,
/* 49 - 1 */ kNumberCharacter,
/* 50 - 2 */ kNumberCharacter,
/* 51 - 3 */ kNumberCharacter,
/* 52 - 4 */ kNumberCharacter,
/* 53 - 5 */ kNumberCharacter,
/* 54 - 6 */ kNumberCharacter,
/* 55 - 7 */ kNumberCharacter,
/* 56 - 8 */ kNumberCharacter,
/* 57 - 9 */ kNumberCharacter,
/* 58 - : */ kOtherCharacter,
/* 59 - ; */ kEndMediaQueryOrSupportsCharacter,
/* 60 - < */ kLessCharacter,
/* 61 - = */ kOtherCharacter,
/* 62 - > */ kOtherCharacter,
/* 63 - ? */ kOtherCharacter,
/* 64 - @ */ kAtCharacter,
/* 65 - A */ kIdentifierStartCharacter,
/* 66 - B */ kIdentifierStartCharacter,
/* 67 - C */ kIdentifierStartCharacter,
/* 68 - D */ kIdentifierStartCharacter,
/* 69 - E */ kIdentifierStartCharacter,
/* 70 - F */ kIdentifierStartCharacter,
/* 71 - G */ kIdentifierStartCharacter,
/* 72 - H */ kIdentifierStartCharacter,
/* 73 - I */ kIdentifierStartCharacter,
/* 74 - J */ kIdentifierStartCharacter,
/* 75 - K */ kIdentifierStartCharacter,
/* 76 - L */ kIdentifierStartCharacter,
/* 77 - M */ kIdentifierStartCharacter,
/* 78 - N */ kIdentifierStartCharacter,
/* 79 - O */ kIdentifierStartCharacter,
/* 80 - P */ kIdentifierStartCharacter,
/* 81 - Q */ kIdentifierStartCharacter,
/* 82 - R */ kIdentifierStartCharacter,
/* 83 - S */ kIdentifierStartCharacter,
/* 84 - T */ kIdentifierStartCharacter,
/* 85 - U */ kCaselessUCharacter,
/* 86 - V */ kIdentifierStartCharacter,
/* 87 - W */ kIdentifierStartCharacter,
/* 88 - X */ kIdentifierStartCharacter,
/* 89 - Y */ kIdentifierStartCharacter,
/* 90 - Z */ kIdentifierStartCharacter,
/* 91 - [ */ kOtherCharacter,
/* 92 - \ */ kBackSlashCharacter,
/* 93 - ] */ kOtherCharacter,
/* 94 - ^ */ kXorCharacter,
/* 95 - _ */ kIdentifierStartCharacter,
/* 96 - ` */ kOtherCharacter,
/* 97 - a */ kIdentifierStartCharacter,
/* 98 - b */ kIdentifierStartCharacter,
/* 99 - c */ kIdentifierStartCharacter,
/* 100 - d */ kIdentifierStartCharacter,
/* 101 - e */ kIdentifierStartCharacter,
/* 102 - f */ kIdentifierStartCharacter,
/* 103 - g */ kIdentifierStartCharacter,
/* 104 - h */ kIdentifierStartCharacter,
/* 105 - i */ kIdentifierStartCharacter,
/* 106 - j */ kIdentifierStartCharacter,
/* 107 - k */ kIdentifierStartCharacter,
/* 108 - l */ kIdentifierStartCharacter,
/* 109 - m */ kIdentifierStartCharacter,
/* 110 - n */ kIdentifierStartCharacter,
/* 111 - o */ kIdentifierStartCharacter,
/* 112 - p */ kIdentifierStartCharacter,
/* 113 - q */ kIdentifierStartCharacter,
/* 114 - r */ kIdentifierStartCharacter,
/* 115 - s */ kIdentifierStartCharacter,
/* 116 - t */ kIdentifierStartCharacter,
/* 117 - u */ kCaselessUCharacter,
/* 118 - v */ kIdentifierStartCharacter,
/* 119 - w */ kIdentifierStartCharacter,
/* 120 - x */ kIdentifierStartCharacter,
/* 121 - y */ kIdentifierStartCharacter,
/* 122 - z */ kIdentifierStartCharacter,
/* 123 - { */ kEndMediaQueryOrSupportsCharacter,
/* 124 - | */ kVerticalBarCharacter,
/* 125 - } */ kOtherCharacter,
/* 126 - ~ */ kTildeCharacter,
/* 127 - Delete */ kOtherCharacter,
};
// Facilitates comparison of an input character to a lowercase English
// character. This is low-level facility, normally you will want to use
// IsAsciiAlphaCaselessEqual() for that.
inline char ToAsciiLowerUnchecked(char character) { return character | 0x20; }
// Compares an input character to a (preferably) constant ASCII lowercase.
inline bool IsAsciiAlphaCaselessEqual(char actual, char expected) {
DCHECK_GE(expected, 'a');
DCHECK_LE(expected, 'z');
return LIKELY(ToAsciiLowerUnchecked(actual) == expected);
}
inline bool IsCssEscape(char character) {
return character >= ' ' && character != 127;
}
inline bool IsIdentifierStartAfterDash(const char* character_iterator) {
return IsAsciiAlpha(character_iterator[0]) || character_iterator[0] == '_' ||
character_iterator[0] < 0 ||
(character_iterator[0] == '\\' && IsCssEscape(character_iterator[1]));
}
inline const char* SkipWhiteSpace(const char* input_iterator) {
while (cssom::IsWhiteSpace(*input_iterator)) {
++input_iterator;
}
return input_iterator;
}
// Returns false if input iterator doesn't point at the escape sequence.
// Otherwise sets the result iterator to a position of the character that
// follows the escape sequence.
bool CheckAndSkipEscape(const char* input_iterator,
const char** result_iterator) {
DCHECK_EQ(*input_iterator, '\\');
++input_iterator;
if (!IsCssEscape(*input_iterator)) {
return false;
}
if (IsHexDigit(*input_iterator)) {
int length(6);
do {
++input_iterator;
} while (IsHexDigit(*input_iterator) && --length > 0);
// Optional space after the escape sequence.
if (cssom::IsWhiteSpace(*input_iterator)) {
++input_iterator;
}
*result_iterator = input_iterator;
return true;
}
*result_iterator = input_iterator + 1;
return true;
}
// Returns false if input iterator doesn't point at the valid string.
// Otherwise sets the result iterator to a position of the character that
// follows the string.
inline bool CheckAndSkipString(const char* input_iterator, char quote,
const char** result_iterator) {
while (true) {
if (UNLIKELY(*input_iterator == quote)) {
// String parsing is successful.
*result_iterator = input_iterator + 1;
return true;
}
if (UNLIKELY(*input_iterator == '\0')) {
// String parsing is successful up to end of input.
*result_iterator = input_iterator;
return true;
}
if (UNLIKELY(
*input_iterator <= '\r' &&
(*input_iterator == '\n' || (*input_iterator | 0x1) == '\r'))) {
// String parsing is failed for character '\n', '\f' or '\r'.
return false;
}
if (LIKELY(input_iterator[0] != '\\')) {
++input_iterator;
} else if (input_iterator[1] == '\n' || input_iterator[1] == '\f') {
input_iterator += 2;
} else if (input_iterator[1] == '\r') {
input_iterator += input_iterator[2] == '\n' ? 3 : 2;
} else {
if (!CheckAndSkipEscape(input_iterator, &input_iterator)) {
return false;
}
}
}
}
inline bool IsUriLetter(char character) {
return (character >= '*' && character != 127) ||
(character >= '#' && character <= '&') || character == '!';
}
inline bool IsCssLetter(char character) {
return character < 0 ||
kTypesOfAsciiCharacters[static_cast<unsigned char>(character)] <=
kDashCharacter;
}
// Compares a character range with a zero terminated string.
inline bool IsEqualToCssIdentifier(const char* actual, const char* expected) {
do {
// The input must be part of an identifier if "actual" or "expected"
// contains '-'. Otherwise ToAsciiLowerUnchecked('\r') would be equal
// to '-'.
DCHECK((*expected >= 'a' && *expected <= 'z') ||
(*expected >= '0' && *expected <= '9') || *expected == '-');
DCHECK(*expected != '-' || IsCssLetter(*actual));
if (ToAsciiLowerUnchecked(*actual++) != (*expected++)) {
return false;
}
} while (*expected);
return true;
}
} // namespace
Scanner::Scanner(const char* input_iterator, StringPool* string_pool)
: input_iterator_(input_iterator),
string_pool_(string_pool),
parsing_mode_(kNormalMode),
line_number_(1),
line_start_(input_iterator) {}
void Scanner::ScanUnrecognizedAtRule() {
std::stack<char> brace_stack;
bool enter_rule_body = false;
// Until a no matching closing curly-brace <}-token> is scanned, reach
// the end of input or encounter a semicolon token before entering rule body.
while (*input_iterator_ != '\0') {
char first_input_iterator(*input_iterator_++);
if (first_input_iterator == '\n') {
++line_number_;
line_start_ = input_iterator_;
continue;
}
if (!enter_rule_body && first_input_iterator == ';') {
// Encountering a <semicolon-token> ends the at-rule immediately.
return;
}
if (!enter_rule_body && first_input_iterator == '{') {
// Encountering an opening curly-brace <{-token> starts the at-rule's
// body.
enter_rule_body = true;
continue;
}
// The at-rule seeks forward, matching blocks
// (content surrounded by (), {}, or []).
if (first_input_iterator == '(' || first_input_iterator == '{' ||
first_input_iterator == '[') {
// Push the open brace to stack.
brace_stack.push(first_input_iterator);
continue;
}
if (first_input_iterator == ')' || first_input_iterator == '}' ||
first_input_iterator == ']') {
// Encountering a closing curly-brace <}-token> that isn't matched by
// anything else or inside of another block.
if (first_input_iterator == '}' && brace_stack.empty()) {
return;
}
if (brace_stack.empty()) {
// no matching found with ')' and ']' end brace, skip it. The scanner
// does not care about the at rule grammar.
continue;
}
if ((first_input_iterator == ')' && brace_stack.top() == '(') ||
(first_input_iterator == '}' && brace_stack.top() == '{') ||
(first_input_iterator == ']' && brace_stack.top() == '[')) {
// Pop the open brace from stack when encourtering a match.
brace_stack.pop();
continue;
}
}
}
}
void Scanner::HandleBraceIfExists(char character) {
if (character == '[' || character == '(' || character == '{') {
open_braces_.push(character);
}
if (character == ']' || character == ')' || character == '}') {
if (!open_braces_.empty()) {
char top = open_braces_.top();
if ((top == '[' && character == ']') ||
(top == '(' && character == ')') ||
(top == '{' && character == '}')) {
// Found a match, then pop the top element.
open_braces_.pop();
}
}
}
}
Token Scanner::Scan(TokenValue* token_value, YYLTYPE* token_location) {
// Loop until non-comment token is scanned.
while (true) {
token_location->first_line = line_number_;
token_location->first_column =
static_cast<int>(input_iterator_ - line_start_) + 1;
token_location->line_start = line_start_;
// Return all prepended tokens before actual input.
if (!prepended_tokens_.empty()) {
Token prepended_token = prepended_tokens_.front();
if ((prepended_token == kMediaListEntryPointToken) ||
(prepended_token == kMediaQueryEntryPointToken)) {
parsing_mode_ = kMediaQueryMode;
}
prepended_tokens_.pop_front();
return prepended_token;
}
char first_character(*input_iterator_);
HandleBraceIfExists(first_character);
CharacterType character_type(
first_character >= 0 ? kTypesOfAsciiCharacters
[static_cast<unsigned char>(first_character)]
: kIdentifierStartCharacter);
switch (character_type) {
case kCaselessUCharacter:
return ScanFromCaselessU(token_value);
case kIdentifierStartCharacter:
return ScanFromIdentifierStart(token_value);
case kDotCharacter:
return ScanFromDot(token_value);
case kNumberCharacter:
return ScanFromNumber(token_value);
case kDashCharacter:
return ScanFromDash(token_value);
case kOtherCharacter:
return ScanFromOtherCharacter();
case kNullCharacter:
return ScanFromNull();
case kWhitespaceCharacter:
return ScanFromWhitespace();
case kEndMediaQueryOrSupportsCharacter:
return ScanFromEndMediaQueryOrSupports();
case kEndNthChildCharacter:
return ScanFromEndNthChild();
case kQuoteCharacter:
return ScanFromQuote(token_value);
case kExclamationMarkCharacter:
return ScanFromExclamationMark(token_value);
case kHashmarkCharacter:
return ScanFromHashmark(token_value);
case kSlashCharacter: {
// Ignore comments. They are not even considered as white spaces.
Token token(ScanFromSlash());
if (token != kCommentToken) {
return token;
}
break;
}
case kDollarCharacter:
return ScanFromDollar();
case kAsteriskCharacter:
return ScanFromAsterisk();
case kPlusCharacter:
return ScanFromPlus(token_value);
case kLessCharacter:
return ScanFromLess();
case kAtCharacter: {
Token token(ScanFromAt(token_value));
// Ignore other browsers at rule and not supported at rule.
if (token == kInvalidAtBlockToken ||
token == kOtherBrowserAtBlockToken) {
ScanUnrecognizedAtRule();
}
return token;
}
case kBackSlashCharacter:
return ScanFromBackSlash(token_value);
case kXorCharacter:
return ScanFromXor();
case kVerticalBarCharacter:
return ScanFromVerticalBar();
case kTildeCharacter:
return ScanFromTilde();
default:
NOTREACHED();
break;
}
}
}
void Scanner::PrependToken(Token token) { prepended_tokens_.push_back(token); }
bool Scanner::DetectPropertyNameToken(const std::string& property_name,
Token* property_name_token) const {
return DetectPropertyNameToken(
TrivialStringPiece::FromCString(property_name.c_str()),
property_name_token);
}
Token Scanner::ScanFromCaselessU(TokenValue* token_value) {
const char* saved_input_iterator(input_iterator_++);
if (UNLIKELY(*input_iterator_ == '+')) {
if (TryScanUnicodeRange(&token_value->integer_pair)) {
return kUnicodeRangeToken;
}
}
input_iterator_ = saved_input_iterator;
return ScanFromIdentifierStart(token_value);
}
Token Scanner::ScanFromIdentifierStart(TokenValue* token_value) {
const char* first_character_iterator(input_iterator_);
if (parsing_mode_ == kMediaQueryMode) {
Token media_feature_name_prefix;
if (DetectMediaFeatureNamePrefix(&media_feature_name_prefix)) {
return media_feature_name_prefix;
}
}
bool has_escape;
ScanIdentifier(&token_value->string, &has_escape);
if (LIKELY(!has_escape)) {
if (parsing_mode_ == kMediaQueryMode) {
Token media_query_token;
cssom::MediaFeatureName media_feature_name;
if (DetectMediaQueryToken(token_value->string, &media_query_token,
&media_feature_name)) {
token_value->integer = static_cast<int>(media_feature_name);
return media_query_token;
}
} else {
Token property_name_token;
if (DetectPropertyNameToken(token_value->string, &property_name_token)) {
return property_name_token;
}
Token property_value_token;
if (DetectPropertyValueToken(token_value->string,
&property_value_token)) {
return property_value_token;
}
Token pseudo_class_name_token;
if (DetectPseudoClassNameToken(token_value->string,
&pseudo_class_name_token)) {
return pseudo_class_name_token;
}
Token pseudo_element_name_token;
if (DetectPseudoElementNameToken(token_value->string,
&pseudo_element_name_token)) {
return pseudo_element_name_token;
}
}
}
if (UNLIKELY(*input_iterator_ == '(')) {
// Cache the open brace.
open_braces_.push('(');
if (parsing_mode_ == kSupportsMode && !has_escape) {
Token supports_token;
if (DetectSupportsToken(token_value->string, &supports_token)) {
return supports_token;
}
}
if (!has_escape) {
Token function_token;
if (DetectKnownFunctionTokenAndMaybeChangeParsingMode(token_value->string,
&function_token)) {
++input_iterator_;
if (function_token == kUriToken) {
TrivialStringPiece uri;
if (TryScanUri(&uri)) {
token_value->string = uri;
return kUriToken;
}
return kInvalidFunctionToken;
}
return function_token;
}
if (parsing_mode_ == kMediaQueryMode) {
// ... and(max-width: 480px) ... looks like a function, but in fact
// it is not, so run more detection code in the MediaQueryMode.
Token media_query_token;
cssom::MediaFeatureName media_feature_name;
if (DetectMediaQueryToken(token_value->string, &media_query_token,
&media_feature_name)) {
token_value->integer = static_cast<int>(media_feature_name);
return media_query_token;
}
}
}
++input_iterator_;
return kInvalidFunctionToken;
}
if (UNLIKELY(parsing_mode_ != kNormalMode) && !has_escape) {
if (parsing_mode_ == kMediaQueryMode) {
Token media_query_token;
cssom::MediaFeatureName media_feature_name;
if (DetectMediaQueryToken(token_value->string, &media_query_token,
&media_feature_name)) {
token_value->integer = static_cast<int>(media_feature_name);
return media_query_token;
}
} else if (parsing_mode_ == kSupportsMode) {
Token supports_token;
if (DetectSupportsToken(token_value->string, &supports_token)) {
return supports_token;
}
} else if (parsing_mode_ == kNthChildMode &&
IsAsciiAlphaCaselessEqual(token_value->string.begin[0], 'n')) {
if (token_value->string.size() == 1) {
// String "n" is kIdentifier but "n+1" is kNthToken.
TrivialStringPiece nth;
if (TryScanNthChildExtra(&nth)) {
token_value->string.end = nth.end;
return kNthToken;
}
} else if (token_value->string.size() >= 2 &&
token_value->string.begin[1] == '-') {
// String "n-" is kIdentifierToken but "n-1" is kNthToken.
// Set input_iterator_ to '-' to continue parsing.
const char* saved_input_iterator(input_iterator_);
input_iterator_ = first_character_iterator + 1;
TrivialStringPiece nth;
if (TryScanNthChildExtra(&nth)) {
token_value->string.end = nth.end;
return kNthToken;
}
// Revert the change to input_iterator_ if unsuccessful.
input_iterator_ = saved_input_iterator;
}
}
}
return kIdentifierToken;
}
Token Scanner::ScanFromDot(TokenValue* token_value) {
if (!IsAsciiDigit(input_iterator_[1])) {
++input_iterator_;
return '.';
}
return ScanFromNumber(token_value);
}
Token Scanner::ScanFromNumber(TokenValue* token_value) {
TrivialStringPiece number;
number.begin = input_iterator_;
// Negative numbers are handled in the grammar.
// Scientific notation is required by the standard but is not supported
// neither by WebKit nor Blink.
bool dot_seen(false);
while (true) {
if (!IsAsciiDigit(input_iterator_[0])) {
// Only one dot is allowed for a number,
// and it must be followed by a digit.
if (input_iterator_[0] != '.' || dot_seen ||
!IsAsciiDigit(input_iterator_[1])) {
break;
}
dot_seen = true;
}
++input_iterator_;
}
number.end = input_iterator_;
if (UNLIKELY(parsing_mode_ == kNthChildMode) && !dot_seen &&
IsAsciiAlphaCaselessEqual(*input_iterator_, 'n')) {
// A string that matches a regexp "[0-9]+n" is always an kNthToken.
token_value->string.begin = number.begin;
token_value->string.end = ++input_iterator_;
TrivialStringPiece nth;
if (TryScanNthChildExtra(&nth)) {
token_value->string.end = nth.end;
}
return kNthToken;
}
char* number_end(const_cast<char*>(number.end));
// We parse into |double| for two reasons:
// - C++03 doesn't have std::strtof() function;
// - |float|'s significand is not large enough to represent |int| precisely.
// |number_end| is used by std::strtod() as a pure output parameter - it's
// input value is not used. std::strtod() may parse more of the number than
// we expect, e.g. in the case of scientific notation or hexadecimal format.
// In these cases (number_end != number.end), return an invalid number token.
double real_as_double(std::strtod(number.begin, &number_end));
if (number_end != number.end ||
real_as_double != real_as_double || // n != n if and only if it's NaN.
real_as_double == std::numeric_limits<float>::infinity() ||
real_as_double > std::numeric_limits<float>::max()) {
token_value->string.begin = number.begin;
token_value->string.end = number.end;
return kInvalidNumberToken;
}
float real_as_float = static_cast<float>(real_as_double);
// Type of the function.
if (IsInputIteratorAtIdentifierStart()) {
TrivialStringPiece unit;
bool has_escape;
ScanIdentifier(&unit, &has_escape);
Token unit_token;
if (has_escape || !DetectUnitToken(unit, &unit_token)) {
token_value->string.begin = number.begin;
token_value->string.end = unit.end;
return kInvalidDimensionToken;
}
token_value->real = real_as_float;
return unit_token;
}
if (*input_iterator_ == '%') {
++input_iterator_;
token_value->real = real_as_float;
return kPercentageToken;
}
if (!dot_seen && real_as_double <= std::numeric_limits<int>::max()) {
token_value->integer = static_cast<int>(real_as_double);
return kIntegerToken;
}
token_value->real = real_as_float;
return kRealToken;
}
Token Scanner::ScanFromDash(TokenValue* token_value) {
if (IsIdentifierStartAfterDash(input_iterator_ + 1)) {
const char* first_character_iterator(input_iterator_);
TrivialStringPiece name;
bool has_escape;
ScanIdentifier(&name, &has_escape);
if (LIKELY(!has_escape)) {
Token property_name_token;
if (DetectPropertyNameToken(name, &property_name_token)) {
return property_name_token;
}
}
if (*input_iterator_ == '(') {
// Cache the open brace.
open_braces_.push('(');
if (!has_escape) {
Token function_token;
if (DetectKnownFunctionTokenAndMaybeChangeParsingMode(
name, &function_token)) {
++input_iterator_;
return function_token;
}
}
++input_iterator_;
token_value->string = name;
return kInvalidFunctionToken;
}
if (UNLIKELY(parsing_mode_ == kNthChildMode) && !has_escape &&
IsAsciiAlphaCaselessEqual(first_character_iterator[1], 'n')) {
if (name.size() == 2) {
// String "-n" is kIdentifierToken but "-n+1" is kNthToken.
TrivialStringPiece nth_extra;
if (TryScanNthChildExtra(&nth_extra)) {
token_value->string.begin = name.begin;
token_value->string.end = nth_extra.end;
return kNthToken;
}
}
if (name.size() >= 3 && first_character_iterator[2] == '-') {
// String "-n-" is kIdentifierToken but "-n-1" is kNthToken.
// Set input_iterator_ to second '-' of '-n-' to continue parsing.
const char* saved_input_iterator(input_iterator_);
input_iterator_ = first_character_iterator + 2;
TrivialStringPiece nth_extra;
if (TryScanNthChildExtra(&nth_extra)) {
token_value->string.begin = name.begin;
token_value->string.end = nth_extra.end;
return kNthToken;
}
// Revert the change to currentCharacter if unsuccessful.
input_iterator_ = saved_input_iterator;
}
}
token_value->string = name;
return kIdentifierToken;
}
if (input_iterator_[1] == '-' && input_iterator_[2] == '>') {
input_iterator_ += 3;
return kSgmlCommentDelimiterToken;
}
++input_iterator_;
if (UNLIKELY(parsing_mode_ == kNthChildMode)) {
// A string that matches a regexp "-[0-9]+n" is always an kNthToken.
TrivialStringPiece nth;
if (TryScanNthChild(&nth)) {
token_value->string.begin = nth.begin - 1; // Include leading minus.
TrivialStringPiece nth_extra;
token_value->string.end =
TryScanNthChildExtra(&nth_extra) ? nth_extra.end : nth.end;
return kNthToken;
}
}
return '-';
}
Token Scanner::ScanFromOtherCharacter() {
// A token is simply the current character.
return *input_iterator_++;
}
Token Scanner::ScanFromNull() {
// If there are still unmatched open braces at the end of input, pop the open
// braces and return the their matched close braces.
if (!open_braces_.empty()) {
char pop_element = open_braces_.top();
open_braces_.pop();
if (pop_element == '[') {
return ']';
} else if (pop_element == '{') {
return '}';
} else if (pop_element == '(') {
return ')';
}
}
// Do not advance pointer at the end of input.
return kEndOfFileToken;
}
Token Scanner::ScanFromWhitespace() {
// Might start with a '\n'.
do {
if (*input_iterator_ == '\n') {
++line_number_;
line_start_ = input_iterator_ + 1;
}
++input_iterator_;
} while (
*input_iterator_ >= 0 &&
(kTypesOfAsciiCharacters[static_cast<unsigned char>(*input_iterator_)] ==
kWhitespaceCharacter));
return kWhitespaceToken;
}
Token Scanner::ScanFromEndMediaQueryOrSupports() {
if (parsing_mode_ == kMediaQueryMode || parsing_mode_ == kSupportsMode) {
parsing_mode_ = kNormalMode;
}
return *input_iterator_++;
}
Token Scanner::ScanFromEndNthChild() {
if (parsing_mode_ == kNthChildMode) {
parsing_mode_ = kNormalMode;
}
++input_iterator_;
return ')';
}
Token Scanner::ScanFromQuote(TokenValue* token_value) {
char quote(*input_iterator_++);
const char* string_end;
if (CheckAndSkipString(input_iterator_, quote, &string_end)) {
ScanString(quote, &token_value->string);
return kStringToken;
}
return quote;
}
Token Scanner::ScanFromExclamationMark(TokenValue* /*token_value*/) {
++input_iterator_;
const char* important_start(SkipWhiteSpace(input_iterator_));
if (IsEqualToCssIdentifier(important_start, "important")) {
input_iterator_ = important_start + 9;
return kImportantToken;
}
return '!';
}
Token Scanner::ScanFromHashmark(TokenValue* token_value) {
++input_iterator_;
if (IsAsciiDigit(*input_iterator_)) {
// This must be a valid hex number token.
token_value->string.begin = input_iterator_;
do {
++input_iterator_;
} while (IsHexDigit(*input_iterator_));
token_value->string.end = input_iterator_;
return kHexToken;
} else if (IsInputIteratorAtIdentifierStart()) {
bool has_escape;
ScanIdentifier(&token_value->string, &has_escape);
if (has_escape) {
return kIdSelectorToken;
}
// Check whether the identifier is also a valid hex number.
for (const char* hex_iterator = token_value->string.begin;
hex_iterator != token_value->string.end; ++hex_iterator) {
if (!IsHexDigit(*hex_iterator)) {
return kIdSelectorToken;
}
}
return kHexToken;
}
return '#';
}
Token Scanner::ScanFromSlash() {
++input_iterator_;
// Ignore comments. They are not even considered as white spaces.
if (*input_iterator_ == '*') {
++input_iterator_;
while (input_iterator_[0] != '*' || input_iterator_[1] != '/') {
if (*input_iterator_ == '\n') {
++line_number_;
line_start_ = input_iterator_ + 1;
}
if (*input_iterator_ == '\0') {
// Unterminated comments are simply ignored.
input_iterator_ -= 2;
break;
}
++input_iterator_;
}
input_iterator_ += 2;
return kCommentToken;
}
return '/';
}
Token Scanner::ScanFromDollar() {
++input_iterator_;
if (*input_iterator_ == '=') {
++input_iterator_;
return kEndsWithToken;
}
return '$';
}
Token Scanner::ScanFromAsterisk() {
++input_iterator_;
if (*input_iterator_ == '=') {
++input_iterator_;
return kContainsToken;
}
return '*';
}
Token Scanner::ScanFromPlus(TokenValue* token_value) {
++input_iterator_;
if (UNLIKELY(parsing_mode_ == kNthChildMode)) {
// A string that matches a regexp "+[0-9]*n" is always an kNthToken.
TrivialStringPiece nth;
if (TryScanNthChild(&nth)) {
token_value->string.begin = nth.begin;
TrivialStringPiece nth_extra;
token_value->string.end =
TryScanNthChildExtra(&nth_extra) ? nth_extra.end : nth.end;
return kNthToken;
}
}
return '+';
}
bool Scanner::DetectMediaFeatureNamePrefix(Token* token) {
if (ToAsciiLowerUnchecked(input_iterator_[0]) == 'm') {
if (ToAsciiLowerUnchecked(input_iterator_[1]) == 'i' &&
ToAsciiLowerUnchecked(input_iterator_[2]) == 'n' &&
ToAsciiLowerUnchecked(input_iterator_[3]) == '-') {
input_iterator_ += 4;
*token = kMediaMinimumToken;
return true;
}
if (ToAsciiLowerUnchecked(input_iterator_[1]) == 'a' &&
ToAsciiLowerUnchecked(input_iterator_[2]) == 'x' &&
ToAsciiLowerUnchecked(input_iterator_[3]) == '-') {
input_iterator_ += 4;
*token = kMediaMaximumToken;
return true;
}
}
return false;
}
Token Scanner::ScanFromLess() {
++input_iterator_;
if (input_iterator_[0] == '!' &&
input_iterator_[1] == '-' &&
input_iterator_[2] == '-') {
input_iterator_ += 3;
return kSgmlCommentDelimiterToken;
}
return '<';
}
Token Scanner::ScanFromAt(TokenValue* token_value) {
++input_iterator_;
if (IsInputIteratorAtIdentifierStart()) {
TrivialStringPiece name;
bool has_escape;
ScanIdentifier(&name, &has_escape);
// Include leading "@" in identifier.
if (has_escape) {
std::string* name_string = string_pool_->AllocateString();
name_string->push_back('@');
name_string->append(name.ToString());
name.begin = name_string->c_str();
name.end = name.begin + name_string->size();
} else {
--name.begin;
}
Token at_token;
if (DetectAtTokenAndMaybeChangeParsingMode(name, has_escape, &at_token)) {
if (at_token == kKeyframesToken || at_token == kMediaToken ||
at_token == kFontFaceToken || at_token == kOtherBrowserAtBlockToken) {
// We only return the at_token when matched these four at rules at this
// point, and any other kinds of at rules are not supported.
return at_token;
}
}
token_value->string = name;
return kInvalidAtBlockToken;
}
return '@';
}
Token Scanner::ScanFromBackSlash(TokenValue* token_value) {
if (IsCssEscape(input_iterator_[1])) {
bool has_escape;
ScanIdentifier(&token_value->string, &has_escape);
return kIdentifierToken;
}
return *input_iterator_++;
}
Token Scanner::ScanFromXor() {
++input_iterator_;
if (*input_iterator_ == '=') {
++input_iterator_;
return kBeginsWithToken;
}
return '^';
}
Token Scanner::ScanFromVerticalBar() {
++input_iterator_;
if (*input_iterator_ == '=') {
++input_iterator_;
return kDashMatchToken;
}
return '|';
}
Token Scanner::ScanFromTilde() {
++input_iterator_;
if (*input_iterator_ == '=') {
++input_iterator_;
return kIncludesToken;
}
return '~';
}
bool Scanner::TryScanUnicodeRange(TrivialIntPair* value) {
DCHECK_EQ(*input_iterator_, '+');
const char* saved_input_iterator(input_iterator_);
++input_iterator_;
int length = 6;
int start_value = 0;
bool range_set = false;
while (IsHexDigit(*input_iterator_) && length > 0) {
start_value = start_value * 16 + HexDigitToInt(*input_iterator_);
++input_iterator_;
--length;
}
int32 end_value = start_value;
if (length > 0 && *input_iterator_ == '?') {
// At most 5 hex digit followed by a question mark.
do {
start_value *= 16;
end_value = end_value * 16 + 0xF;
++input_iterator_;
--length;
} while (length > 0 && *input_iterator_ == '?');
range_set = true;
} else if (length < 6) {
// At least one hex digit.
if (input_iterator_[0] == '-' && IsHexDigit(input_iterator_[1])) {
// Followed by a dash and a hex digit.
++input_iterator_;
length = 6;
end_value = 0;
do {
end_value = end_value * 16 + HexDigitToInt(*input_iterator_);
++input_iterator_;
} while (--length > 0 && IsHexDigit(*input_iterator_));
}
range_set = true;
}
if (range_set) {
value->first = start_value;
value->second = end_value;
return true;
}
// Revert parsing position if failed to parse.
input_iterator_ = saved_input_iterator;
return false;
}
void Scanner::ScanIdentifier(TrivialStringPiece* value, bool* has_escape) {
// If a valid identifier start is found, we can safely
// parse the identifier until the next invalid character.
DCHECK(IsInputIteratorAtIdentifierStart());
*has_escape = !TryScanAndMaybeCopyIdentifier<false>(value, NULL);
if (UNLIKELY(*has_escape)) {
CHECK(TryScanAndMaybeCopyIdentifier<true>(value,
string_pool_->AllocateString()));
}
}
bool Scanner::IsInputIteratorAtIdentifierStart() const {
// Check whether an identifier is started.
return IsIdentifierStartAfterDash(
*input_iterator_ != '-' ? input_iterator_ : input_iterator_ + 1);
}
template <bool copy>
bool Scanner::TryScanAndMaybeCopyIdentifier(TrivialStringPiece* value,
std::string* value_copy) {
DCHECK(!copy || value_copy != NULL);
if (!copy) {
value->begin = input_iterator_;
}
do {
if (LIKELY(*input_iterator_ != '\\')) {
if (copy) {
value_copy->push_back(*input_iterator_);
}
++input_iterator_;
} else {
if (!copy) {
// Cannot return a result without a modification.
input_iterator_ = value->begin;
return false;
}
icu::UnicodeString(ScanEscape()).toUTF8String(*value_copy);
}
} while (IsCssLetter(input_iterator_[0]) ||
(input_iterator_[0] == '\\' && IsCssEscape(input_iterator_[1])));
if (copy) {
value->begin = value_copy->c_str();
value->end = value->begin + value_copy->size();
} else {
// value->begin was initialized in the beginning of the method.
value->end = input_iterator_;
}
return true;
}
UChar32 Scanner::ScanEscape() {
DCHECK_EQ(*input_iterator_, '\\');
DCHECK(IsCssEscape(input_iterator_[1]));
UChar32 character(0);
++input_iterator_;
if (IsHexDigit(*input_iterator_)) {
int length(6);
do {
character = (character << 4) + HexDigitToInt(*input_iterator_++);
} while (--length > 0 && IsHexDigit(*input_iterator_));
// Characters above 0x10ffff are not handled.
if (character > 0x10ffff) {
character = 0xfffd;
}
// Optional space after the escape sequence.
if (cssom::IsWhiteSpace(*input_iterator_)) {
++input_iterator_;
}
return character;
}
return *input_iterator_++;
}
// WARNING: every time a new name token is introduced, it should be added
// to |identifier_token| rule in grammar.y.
bool Scanner::DetectPropertyNameToken(const TrivialStringPiece& name,
Token* property_name_token) const {
DCHECK_GT(name.size(), 0U);
switch (name.size()) {
case 3:
if (IsEqualToCssIdentifier(name.begin,
cssom::GetPropertyName(cssom::kAllProperty))) {
*property_name_token = kAllToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin,
cssom::GetPropertyName(cssom::kSrcProperty))) {
*property_name_token = kSrcToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin,
cssom::GetPropertyName(cssom::kTopProperty))) {
*property_name_token = kTopToken;
return true;
}
return false;
case 4:
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kFontProperty))) {
*property_name_token = kFontToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kLeftProperty))) {
*property_name_token = kLeftToken;
return true;
}
return false;
case 5:
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kColorProperty))) {
*property_name_token = kColorToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kRightProperty))) {
*property_name_token = kRightToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kWidthProperty))) {
*property_name_token = kWidthToken;
return true;
}
return false;
case 6:
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kBorderProperty))) {
*property_name_token = kBorderToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kBottomProperty))) {
*property_name_token = kBottomToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kFilterProperty))) {
*property_name_token = kFilterToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kHeightProperty))) {
*property_name_token = kHeightToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kMarginProperty))) {
*property_name_token = kMarginToken;
return true;
}
return false;
case 7:
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kContentProperty))) {
*property_name_token = kContentToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kDisplayProperty))) {
*property_name_token = kDisplayToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kOpacityProperty))) {
*property_name_token = kOpacityToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kOutlineProperty))) {
*property_name_token = kOutlineToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kPaddingProperty))) {
*property_name_token = kPaddingToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kZIndexProperty))) {
*property_name_token = kZIndexToken;
return true;
}
return false;
case 8:
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kOverflowProperty))) {
*property_name_token = kOverflowToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kPositionProperty))) {
*property_name_token = kPositionToken;
return true;
}
return false;
case 9:
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kAnimationProperty))) {
*property_name_token = kAnimationToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kFontSizeProperty))) {
*property_name_token = kFontSizeToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kMaxWidthProperty))) {
*property_name_token = kMaxWidthToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kMinWidthProperty))) {
*property_name_token = kMinWidthToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kTransformProperty))) {
*property_name_token = kTransformToken;
return true;
}
// NOTE: word-wrap is treated as an alias for overflow-wrap
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kWordWrapProperty))) {
*property_name_token = kOverflowWrapToken;
return true;
}
return false;
case 10:
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kBackgroundProperty))) {
*property_name_token = kBackgroundToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kBorderTopProperty))) {
*property_name_token = kBorderTopToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kBoxShadowProperty))) {
*property_name_token = kBoxShadowToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kFontStyleProperty))) {
*property_name_token = kFontStyleToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kMarginTopProperty))) {
*property_name_token = kMarginTopToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kMaxHeightProperty))) {
*property_name_token = kMaxHeightToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kMinHeightProperty))) {
*property_name_token = kMinHeightToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kTextAlignProperty))) {
*property_name_token = kTextAlignToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kTransitionProperty))) {
*property_name_token = kTransitionToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kVisibilityProperty))) {
*property_name_token = kVisibilityToken;
return true;
}
return false;
case 11:
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kBorderLeftProperty))) {
*property_name_token = kBorderLeftToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kFontFamilyProperty))) {
*property_name_token = kFontFamilyToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kFontWeightProperty))) {
*property_name_token = kFontWeightToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kLineHeightProperty))) {
*property_name_token = kLineHeightToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kMarginLeftProperty))) {
*property_name_token = kMarginLeftToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kPaddingTopProperty))) {
*property_name_token = kPaddingTopToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kTextIndentProperty))) {
*property_name_token = kTextIndentToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kTextShadowProperty))) {
*property_name_token = kTextShadowToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(cssom::kWhiteSpaceProperty))) {
*property_name_token = kWhiteSpacePropertyToken;
return true;
}
return false;
case 12:
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kBorderRightProperty))) {
*property_name_token = kBorderRightToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kBorderColorProperty))) {
*property_name_token = kBorderColorToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kBorderStyleProperty))) {
*property_name_token = kBorderStyleToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kBorderWidthProperty))) {
*property_name_token = kBorderWidthToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kMarginRightProperty))) {
*property_name_token = kMarginRightToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kPaddingLeftProperty))) {
*property_name_token = kPaddingLeftToken;
return true;
}
return false;
case 13:
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kBorderBottomProperty))) {
*property_name_token = kBorderBottomToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kBorderRadiusProperty))) {
*property_name_token = kBorderRadiusToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kMarginBottomProperty))) {
*property_name_token = kMarginBottomToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kOutlineColorProperty))) {
*property_name_token = kOutlineColorToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kOutlineStyleProperty))) {
*property_name_token = kOutlineStyleToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kOutlineWidthProperty))) {
*property_name_token = kOutlineWidthToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kOverflowWrapProperty))) {
*property_name_token = kOverflowWrapToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kPaddingRightProperty))) {
*property_name_token = kPaddingRightToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kTextOverflowProperty))) {
*property_name_token = kTextOverflowToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kUnicodeRangeProperty))) {
*property_name_token = kUnicodeRangePropertyToken;
return true;
}
return false;
case 14:
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kAnimationNameProperty))) {
*property_name_token = kAnimationNameToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kPaddingBottomProperty))) {
*property_name_token = kPaddingBottomToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kPointerEventsProperty))) {
*property_name_token = kPointerEventsToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kTextTransformProperty))) {
*property_name_token = kTextTransformToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kVerticalAlignProperty))) {
*property_name_token = kVerticalAlignToken;
return true;
}
return false;
case 15:
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kAnimationDelayProperty))) {
*property_name_token = kAnimationDelayToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kBackgroundSizeProperty))) {
*property_name_token = kBackgroundSizeToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kTextDecorationProperty))) {
*property_name_token = kTextDecorationToken;
return true;
}
return false;
case 16:
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kBackgroundColorProperty))) {
*property_name_token = kBackgroundColorToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kBackgroundImageProperty))) {
*property_name_token = kBackgroundImageToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kBorderTopColorProperty))) {
*property_name_token = kBorderTopColorToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kBorderTopStyleProperty))) {
*property_name_token = kBorderTopStyleToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kBorderTopWidthProperty))) {
*property_name_token = kBorderTopWidthToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kTransformOriginProperty))) {
*property_name_token = kTransformOriginToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kTransitionDelayProperty))) {
*property_name_token = kTransitionDelayToken;
return true;
}
return false;
case 17:
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kBorderLeftColorProperty))) {
*property_name_token = kBorderLeftColorToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kBorderLeftStyleProperty))) {
*property_name_token = kBorderLeftStyleToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kBorderLeftWidthProperty))) {
*property_name_token = kBorderLeftWidthToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kBackgroundRepeatProperty))) {
*property_name_token = kBackgroundRepeatToken;
return true;
}
return false;
case 18:
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kAnimationDurationProperty))) {
*property_name_token = kAnimationDurationToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kBorderRightColorProperty))) {
*property_name_token = kBorderRightColorToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kBorderRightStyleProperty))) {
*property_name_token = kBorderRightStyleToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kBorderRightWidthProperty))) {
*property_name_token = kBorderRightWidthToken;
return true;
}
return false;
case 19:
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kAnimationDirectionProperty))) {
*property_name_token = kAnimationDirectionToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kAnimationFillModeProperty))) {
*property_name_token = kAnimationFillModeToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kBackgroundPositionProperty))) {
*property_name_token = kBackgroundPositionToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kBorderBottomColorProperty))) {
*property_name_token = kBorderBottomColorToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kBorderBottomStyleProperty))) {
*property_name_token = kBorderBottomStyleToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kBorderBottomWidthProperty))) {
*property_name_token = kBorderBottomWidthToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kTransitionDurationProperty))) {
*property_name_token = kTransitionDurationToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kTransitionPropertyProperty))) {
*property_name_token = kTransitionPropertyToken;
return true;
}
return false;
case 20:
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kTextDecorationLineProperty))) {
*property_name_token = kTextDecorationLineToken;
return true;
}
return false;
case 21:
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kTextDecorationColorProperty))) {
*property_name_token = kTextDecorationColorToken;
return true;
}
return false;
case 22:
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kBorderTopLeftRadiusProperty))) {
*property_name_token = kBorderTopLeftRadiusToken;
return true;
}
return false;
case 23:
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kBorderTopRightRadiusProperty))) {
*property_name_token = kBorderTopRightRadiusToken;
return true;
}
return false;
case 25:
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(
cssom::kAnimationIterationCountProperty))) {
*property_name_token = kAnimationIterationCountToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(
cssom::kAnimationTimingFunctionProperty))) {
*property_name_token = kAnimationTimingFunctionToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin,
cssom::GetPropertyName(cssom::kBorderBottomLeftRadiusProperty))) {
*property_name_token = kBorderBottomLeftRadiusToken;
return true;
}
return false;
case 26:
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(
cssom::kTransitionTimingFunctionProperty))) {
*property_name_token = kTransitionTimingFunctionToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::GetPropertyName(
cssom::kBorderBottomRightRadiusProperty))) {
*property_name_token = kBorderBottomRightRadiusToken;
return true;
}
return false;
}
return false;
} // NOLINT(readability/fn_size)
// WARNING: every time a new value token is introduced, it should be added
// to |identifier_token| rule in grammar.y.
bool Scanner::DetectPropertyValueToken(const TrivialStringPiece& name,
Token* property_value_token) const {
DCHECK_GT(name.size(), 0U);
switch (name.size()) {
case 2:
if (IsEqualToCssIdentifier(name.begin, cssom::kAtKeywordName)) {
*property_value_token = kAtToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kToKeywordName)) {
*property_value_token = kToToken;
return true;
}
return false;
case 3:
if (IsEqualToCssIdentifier(name.begin, cssom::kEndKeywordName)) {
*property_value_token = kEndToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kPreKeywordName)) {
*property_value_token = kPreToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kRedKeywordName)) {
*property_value_token = kRedToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kTopKeywordName)) {
*property_value_token = kTopToken;
return true;
}
return false;
case 4:
if (IsEqualToCssIdentifier(name.begin, cssom::kAquaKeywordName)) {
*property_value_token = kAquaToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kAutoKeywordName)) {
*property_value_token = kAutoToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kBlueKeywordName)) {
*property_value_token = kBlueToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kBoldKeywordName)) {
*property_value_token = kBoldToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kBothKeywordName)) {
*property_value_token = kBothToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kClipKeywordName)) {
*property_value_token = kClipToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kEaseKeywordName)) {
*property_value_token = kEaseToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kFromKeywordName)) {
*property_value_token = kFromToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kGrayKeywordName)) {
*property_value_token = kGrayToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kNavyKeywordName)) {
*property_value_token = kNavyToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kNoneKeywordName)) {
*property_value_token = kNoneToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kLeftKeywordName)) {
*property_value_token = kLeftToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kLimeKeywordName)) {
*property_value_token = kLimeToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kTealKeywordName)) {
*property_value_token = kTealToken;
return true;
}
return false;
case 5:
if (IsEqualToCssIdentifier(name.begin, cssom::kBlackKeywordName)) {
*property_value_token = kBlackToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kBlockKeywordName)) {
*property_value_token = kBlockToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kCoverKeywordName)) {
*property_value_token = kCoverToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kFixedKeywordName)) {
*property_value_token = kFixedToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kGreenKeywordName)) {
*property_value_token = kGreenToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kInsetKeywordName)) {
*property_value_token = kInsetToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kOliveKeywordName)) {
*property_value_token = kOliveToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kRightKeywordName)) {
*property_value_token = kRightToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kSerifKeywordName)) {
*property_value_token = kSerifToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kSolidKeywordName)) {
*property_value_token = kSolidToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kStartKeywordName)) {
*property_value_token = kStartToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kWhiteKeywordName)) {
*property_value_token = kWhiteToken;
return true;
}
return false;
case 6:
if (IsEqualToCssIdentifier(name.begin, cssom::kBottomKeywordName)) {
*property_value_token = kBottomToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kCenterKeywordName)) {
*property_value_token = kCenterToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kCircleKeywordName)) {
*property_value_token = kCircleToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kHiddenKeywordName)) {
*property_value_token = kHiddenToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kInlineKeywordName)) {
*property_value_token = kInlineToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kItalicKeywordName)) {
*property_value_token = kItalicToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kLinearKeywordName)) {
*property_value_token = kLinearToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kMaroonKeywordName)) {
*property_value_token = kMaroonToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kMiddleKeywordName)) {
*property_value_token = kMiddleToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kNormalKeywordName)) {
*property_value_token = kNormalToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kNoWrapKeywordName)) {
*property_value_token = kNoWrapToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kPurpleKeywordName)) {
*property_value_token = kPurpleToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kRepeatKeywordName)) {
*property_value_token = kRepeatToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kSilverKeywordName)) {
*property_value_token = kSilverToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kStaticKeywordName)) {
*property_value_token = kStaticToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kYellowKeywordName)) {
*property_value_token = kYellowToken;
return true;
}
return false;
case 7:
if (IsEqualToCssIdentifier(name.begin, cssom::kContainKeywordName)) {
*property_value_token = kContainToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kCursiveKeywordName)) {
*property_value_token = kCursiveToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kEaseInKeywordName)) {
*property_value_token = kEaseInToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kEllipseKeywordName)) {
*property_value_token = kEllipseToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kFantasyKeywordName)) {
*property_value_token = kFantasyToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kFuchsiaKeywordName)) {
*property_value_token = kFuchsiaToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kInheritKeywordName)) {
*property_value_token = kInheritToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kInitialKeywordName)) {
*property_value_token = kInitialToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kObliqueKeywordName)) {
*property_value_token = kObliqueToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kReverseKeywordName)) {
*property_value_token = kReverseToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kVisibleKeywordName)) {
*property_value_token = kVisibleToken;
return true;
}
return false;
case 8:
if (IsEqualToCssIdentifier(name.begin, cssom::kAbsoluteKeywordName)) {
*property_value_token = kAbsoluteToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kBaselineKeywordName)) {
*property_value_token = kBaselineToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kEaseOutKeywordName)) {
*property_value_token = kEaseOutToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kForwardsKeywordName)) {
*property_value_token = kForwardsToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kEllipsisKeywordName)) {
*property_value_token = kEllipsisToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kInfiniteKeywordName)) {
*property_value_token = kInfiniteToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kPreLineKeywordName)) {
*property_value_token = kPreLineToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kPreWrapKeywordName)) {
*property_value_token = kPreWrapToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kRelativeKeywordName)) {
*property_value_token = kRelativeToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kRepeatXKeywordName)) {
*property_value_token = kRepeatXToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kRepeatYKeywordName)) {
*property_value_token = kRepeatYToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kStepEndKeywordName)) {
*property_value_token = kStepEndToken;
return true;
}
return false;
case 9:
if (IsEqualToCssIdentifier(name.begin, cssom::kAlternateKeywordName)) {
*property_value_token = kAlternateToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kBackwardsKeywordName)) {
*property_value_token = kBackwardsToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kMonospaceKeywordName)) {
*property_value_token = kMonospaceToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kNoRepeatKeywordName)) {
*property_value_token = kNoRepeatToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kUppercaseKeywordName)) {
*property_value_token = kUppercaseToken;
return true;
}
return false;
case 10:
if (IsEqualToCssIdentifier(name.begin, cssom::kBreakWordKeywordName)) {
*property_value_token = kBreakWordToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kSansSerifKeywordName)) {
*property_value_token = kSansSerifToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kStepStartKeywordName)) {
*property_value_token = kStepStartToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kMonoscopicKeywordName)) {
*property_value_token = kMonoscopicToken;
return true;
}
return false;
case 11:
if (IsEqualToCssIdentifier(name.begin, cssom::kEaseInOutKeywordName)) {
*property_value_token = kEaseInOutToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kTransparentKeywordName)) {
*property_value_token = kTransparentToken;
return true;
}
return false;
case 12:
if (IsEqualToCssIdentifier(name.begin, cssom::kClosestSideKeywordName)) {
*property_value_token = kClosestSideToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kLineThroughKeywordName)) {
*property_value_token = kLineThroughToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kInlineBlockKeywordName)) {
*property_value_token = kInlineBlockToken;
return true;
}
return false;
case 13:
if (IsEqualToCssIdentifier(name.begin, cssom::kFarthestSideKeywordName)) {
*property_value_token = kFarthestSideToken;
return true;
}
return false;
case 14:
if (IsEqualToCssIdentifier(name.begin,
cssom::kClosestCornerKeywordName)) {
*property_value_token = kClosestCornerToken;
return true;
}
return false;
case 15:
if (IsEqualToCssIdentifier(name.begin,
cssom::kFarthestCornerKeywordName)) {
*property_value_token = kFarthestCornerToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin,
cssom::kEquirectangularKeywordName)) {
*property_value_token = kEquirectangularToken;
return true;
}
return false;
case 17:
if (IsEqualToCssIdentifier(name.begin,
cssom::kAlternateReverseKeywordName)) {
*property_value_token = kAlternateReverseToken;
return true;
}
return false;
case 23:
if (IsEqualToCssIdentifier(name.begin,
cssom::kStereoscopicLeftRightKeywordName)) {
*property_value_token = kStereoscopicLeftRightToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin,
cssom::kStereoscopicTopBottomKeywordName)) {
*property_value_token = kStereoscopicTopBottomToken;
return true;
}
return false;
}
return false;
} // NOLINT(readability/fn_size)
// WARNING: every time a new value token is introduced, it should be added
// to |identifier_token| rule in grammar.y.
bool Scanner::DetectPseudoClassNameToken(const TrivialStringPiece& name,
Token* pseudo_class_name_token) const {
DCHECK_GT(name.size(), 0U);
switch (name.size()) {
case 5:
if (IsEqualToCssIdentifier(name.begin, cssom::kEmptyPseudoClassName)) {
*pseudo_class_name_token = kEmptyToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kFocusPseudoClassName)) {
*pseudo_class_name_token = kFocusToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kHoverPseudoClassName)) {
*pseudo_class_name_token = kHoverToken;
return true;
}
return false;
case 6:
if (IsEqualToCssIdentifier(name.begin, cssom::kActivePseudoClassName)) {
*pseudo_class_name_token = kActiveToken;
return true;
}
return false;
}
return false;
}
// WARNING: every time a new value token is introduced, it should be added
// to |identifier_token| rule in grammar.y.
bool Scanner::DetectPseudoElementNameToken(
const TrivialStringPiece& name, Token* pseudo_element_name_token) const {
DCHECK_GT(name.size(), 0U);
switch (name.size()) {
case 5:
if (IsEqualToCssIdentifier(name.begin, cssom::kAfterPseudoElementName)) {
*pseudo_element_name_token = kAfterToken;
return true;
}
return false;
case 6:
if (IsEqualToCssIdentifier(name.begin, cssom::kBeforePseudoElementName)) {
*pseudo_element_name_token = kBeforeToken;
return true;
}
return false;
}
return false;
}
bool Scanner::DetectSupportsToken(const TrivialStringPiece& name,
Token* supports_token) const {
DCHECK_EQ(parsing_mode_, kSupportsMode);
if (name.size() == 2) {
if (IsAsciiAlphaCaselessEqual(name.begin[0], 'o') &&
IsAsciiAlphaCaselessEqual(name.begin[1], 'r')) {
*supports_token = kSupportsOrToken;
return true;
}
} else if (name.size() == 3) {
if (IsAsciiAlphaCaselessEqual(name.begin[0], 'a') &&
IsAsciiAlphaCaselessEqual(name.begin[1], 'n') &&
IsAsciiAlphaCaselessEqual(name.begin[2], 'd')) {
*supports_token = kSupportsAndToken;
return true;
}
if (IsAsciiAlphaCaselessEqual(name.begin[0], 'n') &&
IsAsciiAlphaCaselessEqual(name.begin[1], 'o') &&
IsAsciiAlphaCaselessEqual(name.begin[2], 't')) {
*supports_token = kSupportsNotToken;
return true;
}
}
return false;
}
bool Scanner::DetectKnownFunctionTokenAndMaybeChangeParsingMode(
const TrivialStringPiece& name, Token* known_function_token) {
DCHECK_GT(name.size(), 0U);
switch (name.size()) {
case 3:
if (IsAsciiAlphaCaselessEqual(name.begin[0], 'c') &&
IsAsciiAlphaCaselessEqual(name.begin[1], 'u') &&
IsAsciiAlphaCaselessEqual(name.begin[2], 'e')) {
*known_function_token = kCueFunctionToken;
return true;
}
if (IsAsciiAlphaCaselessEqual(name.begin[0], 'n') &&
IsAsciiAlphaCaselessEqual(name.begin[1], 'o') &&
IsAsciiAlphaCaselessEqual(name.begin[2], 't')) {
*known_function_token = kNotFunctionToken;
return true;
}
if (IsAsciiAlphaCaselessEqual(name.begin[0], 'r') &&
IsAsciiAlphaCaselessEqual(name.begin[1], 'g') &&
IsAsciiAlphaCaselessEqual(name.begin[2], 'b')) {
*known_function_token = kRGBFunctionToken;
return true;
}
if (IsAsciiAlphaCaselessEqual(name.begin[0], 'u') &&
IsAsciiAlphaCaselessEqual(name.begin[1], 'r') &&
IsAsciiAlphaCaselessEqual(name.begin[2], 'l')) {
*known_function_token = kUriToken;
return true;
}
return false;
case 4:
if (IsEqualToCssIdentifier(name.begin, "calc")) {
*known_function_token = kCalcFunctionToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, "rgba")) {
*known_function_token = kRGBAFunctionToken;
return true;
}
return false;
case 5:
if (IsEqualToCssIdentifier(name.begin, "local")) {
*known_function_token = kLocalFunctionToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, "scale")) {
*known_function_token = kScaleFunctionToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, "steps")) {
*known_function_token = kStepsFunctionToken;
return true;
}
return false;
case 6:
if (IsEqualToCssIdentifier(name.begin, "format")) {
*known_function_token = kFormatFunctionToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, "matrix")) {
*known_function_token = kMatrixFunctionToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, "rotate")) {
*known_function_token = kRotateFunctionToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, "scalex")) {
*known_function_token = kScaleXFunctionToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, "scaley")) {
*known_function_token = kScaleYFunctionToken;
return true;
}
return false;
case 8:
if (IsEqualToCssIdentifier(name.begin, "matrix3d")) {
*known_function_token = kMatrix3dFunctionToken;
return true;
}
return false;
case 9:
if (IsEqualToCssIdentifier(name.begin, "translate")) {
*known_function_token = kTranslateFunctionToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, "nth-child")) {
parsing_mode_ = kNthChildMode;
*known_function_token = kNthChildFunctionToken;
return true;
}
return false;
case 10:
if (IsEqualToCssIdentifier(name.begin, "translatex")) {
*known_function_token = kTranslateXFunctionToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, "translatey")) {
*known_function_token = kTranslateYFunctionToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, "translatez")) {
*known_function_token = kTranslateZFunctionToken;
return true;
}
return false;
case 11:
if (IsEqualToCssIdentifier(name.begin, "map-to-mesh")) {
*known_function_token = kMapToMeshFunctionToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, "nth-of-type")) {
parsing_mode_ = kNthChildMode;
*known_function_token = kNthOfTypeFunctionToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, "-cobalt-mtm")) {
*known_function_token = kCobaltMtmFunctionToken;
return true;
}
return false;
case 12:
if (IsEqualToCssIdentifier(name.begin, "cubic-bezier")) {
*known_function_token = kCubicBezierFunctionToken;
return true;
}
return false;
case 14:
if (IsEqualToCssIdentifier(name.begin, "nth-last-child")) {
parsing_mode_ = kNthChildMode;
*known_function_token = kNthLastChildFunctionToken;
return true;
}
return false;
case 15:
if (IsEqualToCssIdentifier(name.begin, "linear-gradient")) {
*known_function_token = kLinearGradientFunctionToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, "radial-gradient")) {
*known_function_token = kRadialGradientFunctionToken;
return true;
}
return false;
case 16:
if (IsEqualToCssIdentifier(name.begin, "nth-last-of-type")) {
parsing_mode_ = kNthChildMode;
*known_function_token = kNthLastOfTypeFunctionToken;
return true;
}
return false;
}
return false;
}
bool Scanner::DetectMediaQueryToken(
const TrivialStringPiece& name, Token* media_query_token,
cssom::MediaFeatureName* media_feature_name) const {
DCHECK_EQ(parsing_mode_, kMediaQueryMode);
*media_feature_name = cssom::kInvalidFeature;
switch (name.size()) {
case 2:
if (IsAsciiAlphaCaselessEqual(name.begin[0],
cssom::kTVMediaTypeName[0]) &&
IsAsciiAlphaCaselessEqual(name.begin[1],
cssom::kTVMediaTypeName[1])) {
*media_query_token = kTVMediaTypeToken;
return true;
}
return false;
case 3:
if (IsAsciiAlphaCaselessEqual(name.begin[0], 'a')) {
if (IsAsciiAlphaCaselessEqual(name.begin[1], 'l') &&
IsAsciiAlphaCaselessEqual(name.begin[2], 'l')) {
*media_query_token = kAllMediaTypeToken;
return true;
}
if (IsAsciiAlphaCaselessEqual(name.begin[1], 'n') &&
IsAsciiAlphaCaselessEqual(name.begin[2], 'd')) {
*media_query_token = kMediaAndToken;
return true;
}
return false;
}
if (IsAsciiAlphaCaselessEqual(name.begin[0], 'n') &&
IsAsciiAlphaCaselessEqual(name.begin[1], 'o') &&
IsAsciiAlphaCaselessEqual(name.begin[2], 't')) {
*media_query_token = kMediaNotToken;
return true;
}
return false;
case 4:
if (IsAsciiAlphaCaselessEqual(name.begin[0], 'o') &&
IsAsciiAlphaCaselessEqual(name.begin[1], 'n') &&
IsAsciiAlphaCaselessEqual(name.begin[2], 'l') &&
IsAsciiAlphaCaselessEqual(name.begin[3], 'y')) {
*media_query_token = kMediaOnlyToken;
return true;
}
if (IsAsciiAlphaCaselessEqual(name.begin[0],
cssom::kGridMediaFeatureName[0]) &&
IsAsciiAlphaCaselessEqual(name.begin[1],
cssom::kGridMediaFeatureName[1]) &&
IsAsciiAlphaCaselessEqual(name.begin[2],
cssom::kGridMediaFeatureName[2]) &&
IsAsciiAlphaCaselessEqual(name.begin[3],
cssom::kGridMediaFeatureName[3])) {
*media_feature_name = cssom::kGridMediaFeature;
*media_query_token = kZeroOrOneMediaFeatureTypeToken;
return true;
}
if (IsAsciiAlphaCaselessEqual(name.begin[0],
cssom::kScanMediaFeatureName[0]) &&
IsAsciiAlphaCaselessEqual(name.begin[1],
cssom::kScanMediaFeatureName[1]) &&
IsAsciiAlphaCaselessEqual(name.begin[2],
cssom::kScanMediaFeatureName[2]) &&
IsAsciiAlphaCaselessEqual(name.begin[3],
cssom::kScanMediaFeatureName[3])) {
*media_feature_name = cssom::kScanMediaFeature;
*media_query_token = kScanMediaFeatureTypeToken;
return true;
}
return false;
case 5:
if (IsEqualToCssIdentifier(name.begin, cssom::kColorMediaFeatureName)) {
*media_feature_name = cssom::kColorMediaFeature;
*media_query_token = kNonNegativeIntegerMediaFeatureTypeToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kWidthMediaFeatureName)) {
*media_feature_name = cssom::kWidthMediaFeature;
*media_query_token = kLengthMediaFeatureTypeToken;
return true;
}
return false;
case 6:
if (IsEqualToCssIdentifier(name.begin, cssom::kScreenMediaTypeName)) {
*media_query_token = kScreenMediaTypeToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin, cssom::kHeightMediaFeatureName)) {
*media_feature_name = cssom::kHeightMediaFeature;
*media_query_token = kLengthMediaFeatureTypeToken;
return true;
}
return false;
case 8:
if (IsEqualToCssIdentifier(
name.begin, cssom::kPortraitMediaFeatureKeywordValueName)) {
*media_query_token = kPortraitMediaFeatureKeywordValueToken;
return true;
}
return false;
case 9:
if (IsEqualToCssIdentifier(
name.begin, cssom::kInterlaceMediaFeatureKeywordValueName)) {
*media_query_token = kInterlaceMediaFeatureKeywordValueToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::kLandscapeMediaFeatureKeywordValueName)) {
*media_query_token = kLandscapeMediaFeatureKeywordValueToken;
return true;
}
return false;
case 10:
if (IsEqualToCssIdentifier(name.begin,
cssom::kMonochromeMediaFeatureName)) {
*media_feature_name = cssom::kMonochromeMediaFeature;
*media_query_token = kNonNegativeIntegerMediaFeatureTypeToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin,
cssom::kResolutionMediaFeatureName)) {
*media_feature_name = cssom::kResolutionMediaFeature;
*media_query_token = kResolutionMediaFeatureTypeToken;
return true;
}
return false;
case 11:
if (IsEqualToCssIdentifier(name.begin,
cssom::kColorIndexMediaFeatureName)) {
*media_feature_name = cssom::kColorIndexMediaFeature;
*media_query_token = kNonNegativeIntegerMediaFeatureTypeToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin,
cssom::kOrientationMediaFeatureName)) {
*media_feature_name = cssom::kOrientationMediaFeature;
*media_query_token = kOrientationMediaFeatureTypeToken;
return true;
}
if (IsEqualToCssIdentifier(
name.begin, cssom::kProgressiveMediaFeatureKeywordValueName)) {
*media_query_token = kProgressiveMediaFeatureKeywordValueToken;
return true;
}
return false;
case 12:
if (IsEqualToCssIdentifier(name.begin,
cssom::kAspectRatioMediaFeatureName)) {
*media_feature_name = cssom::kAspectRatioMediaFeature;
*media_query_token = kRatioMediaFeatureTypeToken;
return true;
}
if (IsEqualToCssIdentifier(name.begin,
cssom::kDeviceWidthMediaFeatureName)) {
*media_feature_name = cssom::kDeviceWidthMediaFeature;
*media_query_token = kLengthMediaFeatureTypeToken;
return true;
}
return false;
case 13:
if (IsEqualToCssIdentifier(name.begin,
cssom::kDeviceHeightMediaFeatureName)) {
*media_feature_name = cssom::kDeviceHeightMediaFeature;
*media_query_token = kLengthMediaFeatureTypeToken;
return true;
}
return false;
case 19:
if (IsEqualToCssIdentifier(name.begin,
cssom::kDeviceAspectRatioMediaFeatureName)) {
*media_feature_name = cssom::kDeviceAspectRatioMediaFeature;
*media_query_token = kRatioMediaFeatureTypeToken;
return true;
}
return false;
}
return false;
}
bool Scanner::TryScanUri(TrivialStringPiece* uri) {
const char* uri_start;
const char* uri_end;
char quote;
if (!FindUri(&uri_start, &uri_end, &quote)) {
return false;
}
input_iterator_ = uri_start;
if (UNLIKELY(!TryScanAndMaybeCopyUri<false>(quote, uri, NULL))) {
CHECK(TryScanAndMaybeCopyUri<true>(quote, uri,
string_pool_->AllocateString()));
}
input_iterator_ = uri_end;
return true;
}
bool Scanner::FindUri(const char** uri_start, const char** uri_end,
char* quote) const {
*uri_start = SkipWhiteSpace(input_iterator_);
if (**uri_start == '"' || **uri_start == '\'') {
*quote = **uri_start;
++*uri_start;
if (!CheckAndSkipString(*uri_start, *quote, uri_end)) {
return false;
}
} else {
*quote = 0;
*uri_end = *uri_start;
while (IsUriLetter(**uri_end)) {
if (LIKELY(**uri_end != '\\')) {
++*uri_end;
} else {
if (!CheckAndSkipEscape(*uri_end, uri_end)) {
return false;
}
}
}
}
*uri_end = SkipWhiteSpace(*uri_end);
return **uri_end == ')' || **uri_end == '\0';
}
template <bool copy>
bool Scanner::TryScanAndMaybeCopyUri(char quote, TrivialStringPiece* uri,
std::string* uri_copy) {
if (quote) {
DCHECK(quote == '"' || quote == '\'');
return TryScanAndMaybeCopyString<copy>(quote, uri, uri_copy);
}
if (!copy) {
uri->begin = input_iterator_;
}
while (IsUriLetter(*input_iterator_)) {
if (LIKELY(*input_iterator_ != '\\')) {
if (copy) {
uri_copy->push_back(*input_iterator_);
}
++input_iterator_;
} else {
if (!copy) {
input_iterator_ = uri->begin;
return false;
}
icu::UnicodeString(ScanEscape()).toUTF8String(*uri_copy);
}
}
if (copy) {
uri->begin = uri_copy->c_str();
uri->end = uri->begin + uri_copy->size();
} else {
// uri->begin was initialized in the beginning of the method.
uri->end = input_iterator_;
}
return true;
}
void Scanner::ScanString(char quote, TrivialStringPiece* value) {
if (UNLIKELY(!TryScanAndM