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/*
* Copyright (C) 2016 The Chromium Authors. All rights reserved
* Copyright (C) 2021 Metrological Group B.V.
* Copyright (C) 2021 Igalia S.L.
* Copyright (C) 2023-2024 Apple Inc. All rights reserved.
* Copyright (C) 2024-2025 Samuel Weinig <sam@webkit.org>
*
* 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 "CSSPropertyParserConsumer+UnicodeRange.h"
#include "CSSParserTokenRange.h"
#include "CSSUnicodeRangeValue.h"
#include <wtf/text/ParsingUtilities.h>
#include <wtf/text/StringBuilder.h>
#include <wtf/text/StringParsingBuffer.h>
namespace WebCore {
namespace CSSPropertyParserHelpers {
static bool consumeOptionalDelimiter(CSSParserTokenRange& range, char16_t value)
{
if (!(range.peek().type() == DelimiterToken && range.peek().delimiter() == value))
return false;
range.consume();
return true;
}
static StringView consumeIdentifier(CSSParserTokenRange& range)
{
if (range.peek().type() != IdentToken)
return { };
return range.consume().value();
}
static bool consumeAndAppendOptionalNumber(StringBuilder& builder, CSSParserTokenRange& range, CSSParserTokenType type = NumberToken)
{
if (range.peek().type() != type)
return false;
auto originalText = range.consume().originalText();
if (originalText.isNull())
return false;
builder.append(originalText);
return true;
}
static bool consumeAndAppendOptionalDelimiter(StringBuilder& builder, CSSParserTokenRange& range, char16_t value)
{
if (!consumeOptionalDelimiter(range, value))
return false;
builder.append(value);
return true;
}
static void consumeAndAppendOptionalQuestionMarks(StringBuilder& builder, CSSParserTokenRange& range)
{
while (consumeAndAppendOptionalDelimiter(builder, range, '?')) { }
}
static String consumeUnicodeRangeString(CSSParserTokenRange& range)
{
if (!equalLettersIgnoringASCIICase(consumeIdentifier(range), "u"_s))
return { };
StringBuilder builder;
if (consumeAndAppendOptionalNumber(builder, range, DimensionToken))
consumeAndAppendOptionalQuestionMarks(builder, range);
else if (consumeAndAppendOptionalNumber(builder, range)) {
if (!(consumeAndAppendOptionalNumber(builder, range, DimensionToken) || consumeAndAppendOptionalNumber(builder, range)))
consumeAndAppendOptionalQuestionMarks(builder, range);
} else if (consumeOptionalDelimiter(range, '+')) {
builder.append('+');
if (auto identifier = consumeIdentifier(range); !identifier.isNull())
builder.append(identifier);
else if (!consumeAndAppendOptionalDelimiter(builder, range, '?'))
return { };
consumeAndAppendOptionalQuestionMarks(builder, range);
} else
return { };
return builder.toString();
}
struct UnicodeRange {
char32_t start;
char32_t end;
};
// MARK: <unicode-range-token> consuming (unresolved)
static std::optional<UnicodeRange> consumeUnicodeRangeTokenUnresolved(CSSParserTokenRange& range)
{
return readCharactersForParsing(consumeUnicodeRangeString(range), [&](auto buffer) -> std::optional<UnicodeRange> {
if (!skipExactly(buffer, '+'))
return std::nullopt;
char32_t start = 0;
unsigned hexDigitCount = 0;
while (buffer.hasCharactersRemaining() && isASCIIHexDigit(*buffer)) {
if (++hexDigitCount > 6)
return std::nullopt;
start <<= 4;
start |= toASCIIHexValue(*buffer++);
}
auto end = start;
while (skipExactly(buffer, '?')) {
if (++hexDigitCount > 6)
return std::nullopt;
start <<= 4;
end <<= 4;
end |= 0xF;
}
if (!hexDigitCount)
return std::nullopt;
if (start == end && buffer.hasCharactersRemaining()) {
if (!skipExactly(buffer, '-'))
return std::nullopt;
end = 0;
hexDigitCount = 0;
while (buffer.hasCharactersRemaining() && isASCIIHexDigit(*buffer)) {
if (++hexDigitCount > 6)
return std::nullopt;
end <<= 4;
end |= toASCIIHexValue(*buffer++);
}
if (!hexDigitCount)
return std::nullopt;
}
if (buffer.hasCharactersRemaining())
return std::nullopt;
return { { start, end } };
});
}
RefPtr<CSSValue> consumeUnicodeRangeToken(CSSParserTokenRange& range)
{
auto rangeCopy = range;
auto unicodeRange = consumeUnicodeRangeTokenUnresolved(rangeCopy);
rangeCopy.consumeWhitespace();
if (!unicodeRange || unicodeRange->end > UCHAR_MAX_VALUE || unicodeRange->start > unicodeRange->end)
return nullptr;
range = rangeCopy;
return CSSUnicodeRangeValue::create(unicodeRange->start, unicodeRange->end);
}
} // namespace CSSPropertyParserHelpers
} // namespace WebCore
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