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/*
* Copyright (C) 2003 Lars Knoll (knoll@kde.org)
* Copyright (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
* Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 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 "third_party/blink/renderer/core/css/css_markup.h"
#include "third_party/blink/renderer/core/css/parser/css_parser_idioms.h"
#include "third_party/blink/renderer/core/css/properties/css_parsing_utils.h"
#include "third_party/blink/renderer/platform/font_family_names.h"
#include "third_party/blink/renderer/platform/fonts/font_family.h"
#include "third_party/blink/renderer/platform/wtf/text/character_visitor.h"
#include "third_party/blink/renderer/platform/wtf/text/strcat.h"
#include "third_party/blink/renderer/platform/wtf/text/string_buffer.h"
#include "third_party/blink/renderer/platform/wtf/text/string_builder.h"
namespace blink {
// "ident" from the CSS tokenizer, minus backslash-escape sequences
static bool IsCSSTokenizerIdentifier(const StringView& string) {
unsigned length = string.length();
if (!length) {
return false;
}
return WTF::VisitCharacters(string, [](auto chars) {
size_t index{0};
// -?
if (chars[index] == '-') {
++index;
}
// {nmstart}
if (index == chars.size() || !IsNameStartCodePoint(chars[index])) {
return false;
}
++index;
// {nmchar}*
for (; index < chars.size(); ++index) {
if (!IsNameCodePoint(chars[index])) {
return false;
}
}
return true;
});
}
static void SerializeCharacter(UChar32 c, StringBuilder& append_to) {
append_to.Append('\\');
append_to.Append(c);
}
static void SerializeCharacterAsCodePoint(UChar32 c, StringBuilder& append_to) {
append_to.AppendFormat("\\%x ", c);
}
void SerializeIdentifier(const String& identifier,
StringBuilder& append_to,
bool skip_start_checks) {
bool is_first = !skip_start_checks;
bool is_second = false;
bool is_first_char_hyphen = false;
unsigned index = 0;
while (index < identifier.length()) {
UChar32 c = identifier.CharacterStartingAt(index);
if (c == 0) {
// Check for lone surrogate which characterStartingAt does not return.
c = identifier[index];
}
index += U16_LENGTH(c);
if (c == 0) {
append_to.Append(0xfffd);
} else if (c <= 0x1f || c == 0x7f ||
(0x30 <= c && c <= 0x39 &&
(is_first || (is_second && is_first_char_hyphen)))) {
SerializeCharacterAsCodePoint(c, append_to);
} else if (c == 0x2d && is_first && index == identifier.length()) {
SerializeCharacter(c, append_to);
} else if (0x80 <= c || c == 0x2d || c == 0x5f ||
(0x30 <= c && c <= 0x39) || (0x41 <= c && c <= 0x5a) ||
(0x61 <= c && c <= 0x7a)) {
append_to.Append(c);
} else {
SerializeCharacter(c, append_to);
}
if (is_first) {
is_first = false;
is_second = true;
is_first_char_hyphen = (c == 0x2d);
} else if (is_second) {
is_second = false;
}
}
}
void SerializeString(const String& string, StringBuilder& append_to) {
append_to.Append('\"');
unsigned index = 0;
while (index < string.length()) {
UChar32 c = string.CharacterStartingAt(index);
index += U16_LENGTH(c);
if (c <= 0x1f || c == 0x7f) {
SerializeCharacterAsCodePoint(c, append_to);
} else if (c == 0x22 || c == 0x5c) {
SerializeCharacter(c, append_to);
} else {
append_to.Append(c);
}
}
append_to.Append('\"');
}
String SerializeString(const String& string) {
StringBuilder builder;
SerializeString(string, builder);
return builder.ReleaseString();
}
String SerializeURI(const String& string) {
return WTF::StrCat({"url(", SerializeString(string), ")"});
}
String SerializeFontFamily(const AtomicString& string) {
// Some <font-family> values are serialized without quotes.
// See https://github.com/w3c/csswg-drafts/issues/5846
return (css_parsing_utils::IsCSSWideKeyword(string) ||
css_parsing_utils::IsDefaultKeyword(string) ||
FontFamily::InferredTypeFor(string) ==
FontFamily::Type::kGenericFamily ||
!IsCSSTokenizerIdentifier(string))
? SerializeString(string)
: string;
}
} // namespace blink
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