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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/core/css/css_syntax_string_parser.h"
#include <utility>
#include "third_party/blink/renderer/core/css/css_syntax_component.h"
#include "third_party/blink/renderer/core/css/parser/css_parser_idioms.h"
#include "third_party/blink/renderer/core/css/parser/css_property_parser_helpers.h"
#include "third_party/blink/renderer/core/html/parser/html_parser_idioms.h"
#include "third_party/blink/renderer/platform/runtime_enabled_features.h"
namespace blink {
namespace {
// https://drafts.css-houdini.org/css-properties-values-api-1/#supported-names
base::Optional<CSSSyntaxType> ParseSyntaxType(StringView type) {
if (type == "length")
return CSSSyntaxType::kLength;
if (type == "number")
return CSSSyntaxType::kNumber;
if (type == "percentage")
return CSSSyntaxType::kPercentage;
if (type == "length-percentage")
return CSSSyntaxType::kLengthPercentage;
if (type == "color")
return CSSSyntaxType::kColor;
if (RuntimeEnabledFeatures::CSSVariables2ImageValuesEnabled()) {
if (type == "image")
return CSSSyntaxType::kImage;
}
if (type == "url")
return CSSSyntaxType::kUrl;
if (type == "integer")
return CSSSyntaxType::kInteger;
if (type == "angle")
return CSSSyntaxType::kAngle;
if (type == "time")
return CSSSyntaxType::kTime;
if (type == "resolution")
return CSSSyntaxType::kResolution;
if (RuntimeEnabledFeatures::CSSVariables2TransformValuesEnabled()) {
if (type == "transform-function")
return CSSSyntaxType::kTransformFunction;
if (type == "transform-list")
return CSSSyntaxType::kTransformList;
}
if (type == "custom-ident")
return CSSSyntaxType::kCustomIdent;
return base::nullopt;
}
bool IsPreMultiplied(CSSSyntaxType type) {
return type == CSSSyntaxType::kTransformList;
}
} // namespace
CSSSyntaxStringParser::CSSSyntaxStringParser(const String& string)
: string_(string.StripWhiteSpace()), input_(string_) {}
base::Optional<CSSSyntaxDefinition> CSSSyntaxStringParser::Parse() {
if (string_.IsEmpty())
return base::nullopt;
if (string_.length() == 1 && string_[0] == '*')
return CSSSyntaxDefinition::CreateUniversal();
Vector<CSSSyntaxComponent> components;
while (true) {
if (!ConsumeSyntaxComponent(components))
return base::nullopt;
input_.AdvanceUntilNonWhitespace();
UChar cc = input_.NextInputChar();
input_.Advance();
if (cc == '\0')
break;
if (cc == '|')
continue;
return base::nullopt;
}
return CSSSyntaxDefinition(std::move(components));
}
bool CSSSyntaxStringParser::ConsumeSyntaxComponent(
Vector<CSSSyntaxComponent>& components) {
input_.AdvanceUntilNonWhitespace();
CSSSyntaxType type = CSSSyntaxType::kTokenStream;
String ident;
UChar cc = input_.NextInputChar();
input_.Advance();
if (cc == '<') {
if (!ConsumeDataTypeName(type))
return false;
} else if (IsNameStartCodePoint(cc) || cc == '\\') {
if (NextCharsAreIdentifier(cc, input_)) {
input_.PushBack(cc);
type = CSSSyntaxType::kIdent;
if (!ConsumeIdent(ident))
return false;
}
} else {
return false;
}
DCHECK_NE(type, CSSSyntaxType::kTokenStream);
CSSSyntaxRepeat repeat =
IsPreMultiplied(type) ? CSSSyntaxRepeat::kNone : ConsumeRepeatIfPresent();
components.emplace_back(type, ident, repeat);
return true;
}
CSSSyntaxRepeat CSSSyntaxStringParser::ConsumeRepeatIfPresent() {
UChar cc = input_.NextInputChar();
if (cc == '+') {
input_.Advance();
return CSSSyntaxRepeat::kSpaceSeparated;
}
if (cc == '#') {
input_.Advance();
return CSSSyntaxRepeat::kCommaSeparated;
}
return CSSSyntaxRepeat::kNone;
}
bool CSSSyntaxStringParser::ConsumeDataTypeName(CSSSyntaxType& type) {
for (unsigned size = 0;; ++size) {
UChar cc = input_.PeekWithoutReplacement(size);
if (IsNameCodePoint(cc))
continue;
if (cc == '>') {
unsigned start = input_.Offset();
input_.Advance(size + 1);
if (auto syntax_type = ParseSyntaxType(input_.RangeAt(start, size))) {
type = *syntax_type;
return true;
}
return false;
}
return false;
}
}
bool CSSSyntaxStringParser::ConsumeIdent(String& ident) {
ident = ConsumeName(input_);
// TODO(crbug.com/882285): Make 'default' invalid as <custom-ident>.
return !css_property_parser_helpers::IsCSSWideKeyword(ident) &&
!css_property_parser_helpers::IsRevertKeyword(ident) &&
!css_property_parser_helpers::IsDefaultKeyword(ident);
}
} // namespace blink
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