575ce04148
This is the `CSS` namespace defined in IDL here: https://www.w3.org/TR/cssom-1/#namespacedef-css , not to be confused with our `Web::CSS` namespace. Words are hard. `CSS.escape()` lets you escape identifiers that can then be used to create a CSS string. I've also stubbed out the `CSS.supports()` function.
82 lines
3.3 KiB
C++
82 lines
3.3 KiB
C++
/*
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* Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/StringBuilder.h>
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#include <AK/Utf8View.h>
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#include <LibWeb/CSS/Serialize.h>
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namespace Web::CSS {
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// https://www.w3.org/TR/cssom-1/#escape-a-character
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String escape_a_character(u32 character)
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{
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StringBuilder builder;
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builder.append('\\');
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builder.append_code_point(character);
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return builder.to_string();
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}
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// https://www.w3.org/TR/cssom-1/#escape-a-character-as-code-point
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String escape_a_character_as_code_point(u32 character)
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{
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return String::formatted("\\{:x} ", character);
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}
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// https://www.w3.org/TR/cssom-1/#serialize-an-identifier
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String serialize_an_identifier(StringView const& ident)
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{
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StringBuilder builder;
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Utf8View characters { ident };
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auto first_character = characters.is_empty() ? 0 : *characters.begin();
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// To serialize an identifier means to create a string represented by the concatenation of,
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// for each character of the identifier:
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for (auto character : characters) {
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// If the character is NULL (U+0000), then the REPLACEMENT CHARACTER (U+FFFD).
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if (character == 0) {
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builder.append_code_point(0xFFFD);
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continue;
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}
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// If the character is in the range [\1-\1f] (U+0001 to U+001F) or is U+007F,
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// then the character escaped as code point.
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if ((character >= 0x0001 && character <= 0x001F) || (character == 0x007F)) {
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builder.append(escape_a_character_as_code_point(character));
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continue;
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}
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// If the character is the first character and is in the range [0-9] (U+0030 to U+0039),
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// then the character escaped as code point.
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if (builder.is_empty() && character >= '0' && character <= '9') {
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builder.append(escape_a_character_as_code_point(character));
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continue;
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}
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// If the character is the second character and is in the range [0-9] (U+0030 to U+0039)
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// and the first character is a "-" (U+002D), then the character escaped as code point.
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if (builder.length() == 1 && first_character == '-' && character >= '0' && character <= '9') {
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builder.append(escape_a_character_as_code_point(character));
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continue;
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}
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// If the character is the first character and is a "-" (U+002D), and there is no second
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// character, then the escaped character.
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if (builder.is_empty() && character == '-' && characters.length() == 1) {
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builder.append(escape_a_character(character));
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continue;
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}
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// If the character is not handled by one of the above rules and is greater than or equal to U+0080, is "-" (U+002D) or "_" (U+005F), or is in one of the ranges [0-9] (U+0030 to U+0039), [A-Z] (U+0041 to U+005A), or \[a-z] (U+0061 to U+007A), then the character itself.
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if ((character >= 0x0080)
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|| (character == '-') || (character == '_')
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|| (character >= '0' && character <= '9')
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|| (character >= 'A' && character <= 'Z')
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|| (character >= 'a' && character <= 'z')) {
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builder.append_code_point(character);
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continue;
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}
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// Otherwise, the escaped character.
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builder.append(escape_a_character(character));
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}
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return builder.to_string();
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}
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}
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