157 lines
4.8 KiB
C++
157 lines
4.8 KiB
C++
/*
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* Copyright (C) 2003 Lars Knoll (knoll@kde.org)
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* Copyright (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
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* Copyright (C) 2004-2012, 2016 Apple Inc. All rights reserved.
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* Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
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* Copyright (C) 2008 Eric Seidel <eric@webkit.org>
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* Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
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* Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
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* Copyright (C) 2012 Intel Corporation. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "config.h"
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#include "CSSMarkup.h"
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#include "CSSParserIdioms.h"
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#include <wtf/HexNumber.h>
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#include <wtf/text/StringBuilder.h>
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#include <wtf/unicode/CharacterNames.h>
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namespace WebCore {
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template <typename CharacterType>
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static inline bool isCSSTokenizerIdentifier(const CharacterType* characters, unsigned length)
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{
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const CharacterType* end = characters + length;
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// -?
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if (characters != end && characters[0] == '-')
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++characters;
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// {nmstart}
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if (characters == end || !isNameStartCodePoint(characters[0]))
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return false;
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++characters;
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// {nmchar}*
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for (; characters != end; ++characters) {
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if (!isNameCodePoint(characters[0]))
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return false;
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}
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return true;
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}
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// "ident" from the CSS tokenizer, minus backslash-escape sequences
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static bool isCSSTokenizerIdentifier(const String& string)
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{
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unsigned length = string.length();
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if (!length)
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return false;
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if (string.is8Bit())
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return isCSSTokenizerIdentifier(string.characters8(), length);
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return isCSSTokenizerIdentifier(string.characters16(), length);
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}
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static void serializeCharacter(UChar32 c, StringBuilder& appendTo)
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{
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appendTo.append('\\');
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appendTo.appendCharacter(c);
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}
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static void serializeCharacterAsCodePoint(UChar32 c, StringBuilder& appendTo)
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{
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appendTo.append('\\', hex(c, Lowercase), ' ');
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}
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void serializeIdentifier(const String& identifier, StringBuilder& appendTo, bool skipStartChecks)
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{
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bool isFirst = !skipStartChecks;
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bool isSecond = false;
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bool isFirstCharHyphen = false;
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unsigned index = 0;
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while (index < identifier.length()) {
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UChar32 c = identifier.characterStartingAt(index);
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if (!c) {
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// Check for lone surrogate which characterStartingAt does not return.
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c = identifier[index];
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}
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index += U16_LENGTH(c);
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if (!c)
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appendTo.append(replacementCharacter);
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else if (c <= 0x1f || c == 0x7f || (0x30 <= c && c <= 0x39 && (isFirst || (isSecond && isFirstCharHyphen))))
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serializeCharacterAsCodePoint(c, appendTo);
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else if (c == 0x2d && isFirst && index == identifier.length())
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serializeCharacter(c, appendTo);
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else if (0x80 <= c || c == 0x2d || c == 0x5f || (0x30 <= c && c <= 0x39) || (0x41 <= c && c <= 0x5a) || (0x61 <= c && c <= 0x7a))
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appendTo.appendCharacter(c);
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else
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serializeCharacter(c, appendTo);
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if (isFirst) {
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isFirst = false;
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isSecond = true;
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isFirstCharHyphen = (c == 0x2d);
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} else if (isSecond)
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isSecond = false;
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}
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}
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void serializeString(const String& string, StringBuilder& appendTo)
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{
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appendTo.append('"');
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unsigned index = 0;
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while (index < string.length()) {
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UChar32 c = string.characterStartingAt(index);
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index += U16_LENGTH(c);
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if (c <= 0x1f || c == 0x7f)
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serializeCharacterAsCodePoint(c, appendTo);
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else if (c == 0x22 || c == 0x5c)
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serializeCharacter(c, appendTo);
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else
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appendTo.appendCharacter(c);
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}
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appendTo.append('"');
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}
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String serializeString(const String& string)
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{
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StringBuilder builder;
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serializeString(string, builder);
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return builder.toString();
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}
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String serializeURL(const String& string)
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{
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return "url(" + serializeString(string) + ")";
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}
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String serializeFontFamily(const String& string)
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{
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return isCSSTokenizerIdentifier(string) ? string : serializeString(string);
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}
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} // namespace WebCore
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