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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/StringBuffer.h>
#include <wtf/text/StringBuilder.h>
namespace WebCore {
template <typename CharacterType>
static inline bool isCSSTokenizerIdentifier(const CharacterType* characters, unsigned length)
{
const CharacterType* end = characters + length;
// -?
if (characters != end && characters[0] == '-')
++characters;
// {nmstart}
if (characters == end || !isNameStartCodePoint(characters[0]))
return false;
++characters;
// {nmchar}*
for (; characters != end; ++characters) {
if (!isNameCodePoint(characters[0]))
return false;
}
return true;
}
// "ident" from the CSS tokenizer, minus backslash-escape sequences
static bool isCSSTokenizerIdentifier(const String& string)
{
unsigned length = string.length();
if (!length)
return false;
if (string.is8Bit())
return isCSSTokenizerIdentifier(string.characters8(), length);
return isCSSTokenizerIdentifier(string.characters16(), length);
}
static void serializeCharacter(UChar32 c, StringBuilder& appendTo)
{
appendTo.append('\\');
appendTo.append(c);
}
static void serializeCharacterAsCodePoint(UChar32 c, StringBuilder& appendTo)
{
appendTo.append('\\');
appendUnsignedAsHex(c, appendTo, Lowercase);
appendTo.append(' ');
}
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()) {
UChar32 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(0xfffd);
else if (c <= 0x1f || c == 0x7f || (0x30 <= c && c <= 0x39 && (isFirst || (isSecond && isFirstCharHyphen))))
serializeCharacterAsCodePoint(c, appendTo);
else if (c == 0x2d && isFirst && index == identifier.length())
serializeCharacter(c, appendTo);
else if (0x80 <= c || c == 0x2d || c == 0x5f || (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 == 0x2d);
} else if (isSecond)
isSecond = false;
}
}
template <typename CharacterType>
static inline bool isCSSTokenizerURL(const CharacterType* characters, unsigned length)
{
const CharacterType* end = characters + length;
for (; characters != end; ++characters) {
CharacterType c = characters[0];
switch (c) {
case '!':
case '#':
case '$':
case '%':
case '&':
break;
default:
if (c < '*')
return false;
if (c <= '~')
break;
if (c < 128)
return false;
}
}
return true;
}
// "url" from the CSS tokenizer, minus backslash-escape sequences
static bool isCSSTokenizerURL(const String& string)
{
unsigned length = string.length();
if (!length)
return true;
if (string.is8Bit())
return isCSSTokenizerURL(string.characters8(), length);
return isCSSTokenizerURL(string.characters16(), length);
}
void serializeString(const String& string, StringBuilder& appendTo)
{
// FIXME: From the CSS OM draft:
// To serialize a string means to create a string represented by '"' (U+0022).
// We need to switch to using " instead of ', but this involves patching a large
// number of tests and changing editing code to not get confused by double quotes.
appendTo.append('"');
unsigned index = 0;
while (index < string.length()) {
UChar32 c = string.characterStartingAt(index);
index += U16_LENGTH(c);
if (c <= 0x1f || c == 0x7f)
serializeCharacterAsCodePoint(c, appendTo);
else if (c == 0x22 || c == 0x5c)
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)
{
// FIXME: URLS must always be double quoted. From the CSS OM draft:
// To serialize a URL means to create a string represented by "url(", followed by
// the serialization of the URL as a string, followed by ")".
// To keep backwards compatibility with existing tests, for now we only quote if needed and
// we use a single quote.
return "url(" + (isCSSTokenizerURL(string) ? string : serializeString(string)) + ")";
}
String serializeAsStringOrCustomIdent(const String& string)
{
if (isCSSTokenizerIdentifier(string)) {
StringBuilder builder;
serializeIdentifier(string, builder);
return builder.toString();
}
return serializeString(string);
}
String serializeFontFamily(const String& string)
{
return isCSSTokenizerIdentifier(string) ? string : serializeString(string);
}
} // namespace WebCore
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