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/*
* Copyright (C) 2021 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. AND ITS 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 APPLE INC. OR ITS 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 "FragmentDirectiveParser.h"
#include "Logging.h"
#include <wtf/Deque.h>
#include <wtf/URL.h>
#include <wtf/URLParser.h>
#include <wtf/text/TextStream.h>
namespace WebCore {
FragmentDirectiveParser::FragmentDirectiveParser(StringView fragmentDirective)
{
parseFragmentDirective(fragmentDirective);
m_fragmentDirective = fragmentDirective;
m_isValid = true;
}
// https://wicg.github.io/scroll-to-text-fragment/#parse-a-text-directive
void FragmentDirectiveParser::parseFragmentDirective(StringView fragmentDirective)
{
LOG_WITH_STREAM(TextFragment, stream << " parseFragmentDirective: ");
Vector<ParsedTextDirective> parsedTextDirectives;
String textDirectivePrefix = "text="_s;
auto directives = fragmentDirective.split('&');
LOG_WITH_STREAM(TextFragment, stream << " parseFragmentDirective: ");
for (auto directive : directives) {
if (!directive.startsWith(textDirectivePrefix))
continue;
auto textDirective = directive.substring(textDirectivePrefix.length());
Deque<String> tokens;
bool containsEmptyToken = false;
for (auto token : textDirective.split(',')) {
if (token.isEmpty()) {
LOG_WITH_STREAM(TextFragment, stream << " empty token ");
containsEmptyToken = true;
break;
}
tokens.append(token.toString());
}
if (containsEmptyToken)
continue;
if (tokens.size() > 4 || tokens.size() < 1) {
LOG_WITH_STREAM(TextFragment, stream << " wrong number of tokens ");
continue;
}
ParsedTextDirective parsedTextDirective;
if (tokens.first().endsWith('-') && tokens.first().length() > 1) {
auto takenFirstToken = tokens.takeFirst();
if (auto prefix = WTF::URLParser::formURLDecode(StringView(takenFirstToken).left(takenFirstToken.length() - 1)))
parsedTextDirective.prefix = WTFMove(*prefix);
else
LOG_WITH_STREAM(TextFragment, stream << " could not decode prefix ");
}
if (tokens.last().startsWith('-') && tokens.last().length() > 1) {
tokens.last() = tokens.last().substring(1);
if (auto suffix = WTF::URLParser::formURLDecode(tokens.takeLast()))
parsedTextDirective.suffix = WTFMove(*suffix);
else
LOG_WITH_STREAM(TextFragment, stream << " could not decode suffix ");
}
if (tokens.size() != 1 && tokens.size() != 2) {
LOG_WITH_STREAM(TextFragment, stream << " not enough tokens ");
continue;
}
if (auto start = WTF::URLParser::formURLDecode(tokens.first()))
parsedTextDirective.textStart = WTFMove(*start);
else
LOG_WITH_STREAM(TextFragment, stream << " could not decode start ");
if (tokens.size() == 2) {
if (auto end = WTF::URLParser::formURLDecode(tokens.last()))
parsedTextDirective.textEnd = WTFMove(*end);
else
LOG_WITH_STREAM(TextFragment, stream << " could not decode end ");
}
parsedTextDirectives.append(parsedTextDirective);
}
m_parsedTextDirectives = parsedTextDirectives;
}
} // namespace WebCore
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