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/*
* Copyright (C) 2003 Lars Knoll (knoll@kde.org)
* Copyright (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
* Copyright (C) 2004-2012, 2016 Apple Inc. All rights reserved.
* Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
* Copyright (C) 2008 Eric Seidel <eric@webkit.org>
* Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
* Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
* Copyright (C) 2012 Intel Corporation. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "CSSMarkup.h"
#include "CSSParserIdioms.h"
#include <wtf/HexNumber.h>
#include <wtf/text/ParsingUtilities.h>
#include <wtf/text/StringBuilder.h>
#include <wtf/unicode/CharacterNames.h>
namespace WebCore {
template <typename CharacterType>
static inline bool isCSSTokenizerIdentifier(std::span<const CharacterType> characters)
{
// -?
skipWhile(characters, '-');
// {nmstart}
if (!skipExactly<isNameStartCodePoint>(characters))
return false;
// {nmchar}*
skipWhile<isNameCodePoint>(characters);
return characters.empty();
}
// "ident" from the CSS tokenizer, minus backslash-escape sequences
static bool isCSSTokenizerIdentifier(const String& string)
{
if (string.isEmpty())
return false;
if (string.is8Bit())
return isCSSTokenizerIdentifier(string.span8());
return isCSSTokenizerIdentifier(string.span16());
}
static void serializeCharacter(char32_t c, StringBuilder& appendTo)
{
appendTo.append('\\', c);
}
static void serializeCharacterAsCodePoint(char32_t c, StringBuilder& appendTo)
{
appendTo.append('\\', hex(c, Lowercase), ' ');
}
void serializeIdentifier(const String& identifier, StringBuilder& appendTo, bool skipStartChecks)
{
bool isFirst = !skipStartChecks;
bool isSecond = false;
bool isFirstCharHyphen = false;
unsigned index = 0;
while (index < identifier.length()) {
char32_t c = identifier.characterStartingAt(index);
if (!c) {
// Check for lone surrogate which characterStartingAt does not return.
c = identifier[index];
}
index += U16_LENGTH(c);
if (!c)
appendTo.append(replacementCharacter);
else if (c <= 0x1f || c == deleteCharacter || (0x30 <= c && c <= 0x39 && (isFirst || (isSecond && isFirstCharHyphen))))
serializeCharacterAsCodePoint(c, appendTo);
else if (c == hyphenMinus && isFirst && index == identifier.length())
serializeCharacter(c, appendTo);
else if (0x80 <= c || c == hyphenMinus || c == lowLine || (0x30 <= c && c <= 0x39) || (0x41 <= c && c <= 0x5a) || (0x61 <= c && c <= 0x7a))
appendTo.append(c);
else
serializeCharacter(c, appendTo);
if (isFirst) {
isFirst = false;
isSecond = true;
isFirstCharHyphen = (c == hyphenMinus);
} else if (isSecond)
isSecond = false;
}
}
void serializeString(const String& string, StringBuilder& appendTo)
{
appendTo.append('"');
unsigned index = 0;
while (index < string.length()) {
char32_t c = string.characterStartingAt(index);
index += U16_LENGTH(c);
if (c <= 0x1f || c == deleteCharacter)
serializeCharacterAsCodePoint(c, appendTo);
else if (c == quotationMark || c == reverseSolidus)
serializeCharacter(c, appendTo);
else
appendTo.append(c);
}
appendTo.append('"');
}
String serializeString(const String& string)
{
StringBuilder builder;
serializeString(string, builder);
return builder.toString();
}
String serializeURL(const String& string)
{
StringBuilder builder;
builder.append("url("_s);
serializeString(string, builder);
builder.append(')');
return builder.toString();
}
String serializeFontFamily(const String& string)
{
return isCSSTokenizerIdentifier(string) ? string : serializeString(string);
}
} // namespace WebCore
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