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/*
* Copyright (C) 2022 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* 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 "CSSCustomPropertySyntax.h"
#include "CSSParserIdioms.h"
#include "CSSParserTokenRange.h"
#include "CSSTokenizer.h"
#include "ParsingUtilities.h"
#include <wtf/SortedArrayMap.h>
namespace WebCore {
template<typename CharacterType>
auto CSSCustomPropertySyntax::parseComponent(StringParsingBuffer<CharacterType> buffer) -> std::optional<Component>
{
auto consumeMultiplier = [&] {
if (skipExactly(buffer, '+'))
return Multiplier::SpaceList;
if (skipExactly(buffer, '#'))
return Multiplier::CommaList;
return Multiplier::Single;
};
if (skipExactly(buffer, '<')) {
auto begin = buffer.position();
skipUntil(buffer, '>');
if (buffer.position() == begin)
return { };
auto dataTypeName = StringView(begin, buffer.position() - begin);
if (!skipExactly(buffer, '>'))
return { };
auto multiplier = consumeMultiplier();
skipWhile<isCSSSpace>(buffer);
if (!buffer.atEnd())
return { };
auto type = typeForTypeName(dataTypeName);
// <transform-list> is a pre-multiplied data type.
// https://drafts.css-houdini.org/css-properties-values-api/#multipliers
if (type == Type::TransformList && multiplier != Multiplier::Single)
type = Type::Unknown;
return Component { type, multiplier };
}
auto begin = buffer.position();
while (buffer.hasCharactersRemaining() && (*buffer != '+' && *buffer != '#'))
++buffer;
auto ident = [&] {
auto tokenizer = CSSTokenizer::tryCreate(StringView(begin, buffer.position() - begin).toStringWithoutCopying());
if (!tokenizer)
return nullAtom();
auto range = tokenizer->tokenRange();
range.consumeWhitespace();
if (range.peek().type() != IdentToken || !isValidCustomIdentifier(range.peek().id()))
return nullAtom();
auto value = range.consumeIncludingWhitespace().value();
return range.atEnd() ? value.toAtomString() : nullAtom();
}();
if (ident.isNull())
return { };
auto multiplier = consumeMultiplier();
return Component { Type::CustomIdent, multiplier, ident };
}
std::optional<CSSCustomPropertySyntax> CSSCustomPropertySyntax::parse(StringView syntax)
{
// The format doesn't quite parse with CSSTokenizer.
return readCharactersForParsing(syntax, [&](auto buffer) -> std::optional<CSSCustomPropertySyntax> {
skipWhile<isCSSSpace>(buffer);
if (skipExactly(buffer, '*')) {
skipWhile<isCSSSpace>(buffer);
if (buffer.hasCharactersRemaining())
return { };
return universal();
}
Definition definition;
while (buffer.hasCharactersRemaining()) {
auto begin = buffer.position();
skipUntil(buffer, '|');
auto component = parseComponent(StringParsingBuffer { begin, buffer.position() });
if (!component)
return { };
definition.append(*component);
skipExactly(buffer, '|');
skipWhile<isCSSSpace>(buffer);
}
if (definition.isEmpty())
return { };
return CSSCustomPropertySyntax { definition };
});
}
auto CSSCustomPropertySyntax::typeForTypeName(StringView dataTypeName) -> Type
{
static constexpr std::pair<ComparableASCIILiteral, Type> mappings[] = {
{ "angle", Type::Angle },
{ "color", Type::Color },
{ "custom-ident", Type::CustomIdent },
{ "image", Type::Image },
{ "integer", Type::Integer },
{ "length", Type::Length },
{ "length-percentage", Type::LengthPercentage },
{ "number", Type::Number },
{ "percentage", Type::Percentage },
{ "resolution", Type::Resolution },
{ "time", Type::Time },
{ "transform-function", Type::TransformFunction },
{ "transform-list", Type::TransformList },
{ "url", Type::URL },
};
static constexpr SortedArrayMap typeMap { mappings };
return typeMap.get(dataTypeName, Type::Unknown);
}
}
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