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76 lines
2.3 KiB
C++
76 lines
2.3 KiB
C++
/*
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* Copyright (c) 2023, Srikavin Ramkumar <me@srikavin.me>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/StringView.h>
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#include <AK/Utf8View.h>
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#include <LibWeb/HTML/CustomElements/CustomElementName.h>
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namespace Web::HTML {
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// https://html.spec.whatwg.org/multipage/custom-elements.html#custom-elements-core-concepts:prod-pcenchar
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static bool is_pcen_char(u32 code_point)
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{
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return code_point == '-'
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|| code_point == '.'
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|| (code_point >= '0' && code_point <= '9')
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|| code_point == '_'
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|| (code_point >= 'a' && code_point <= 'z')
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|| code_point == 0xb7
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|| (code_point >= 0xc0 && code_point <= 0xd6)
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|| (code_point >= 0xd8 && code_point <= 0xf6)
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|| (code_point >= 0xf8 && code_point <= 0x37d)
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|| (code_point >= 0x37f && code_point <= 0x1fff)
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|| (code_point >= 0x200c && code_point <= 0x200d)
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|| (code_point >= 0x203f && code_point <= 0x2040)
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|| (code_point >= 0x2070 && code_point <= 0x218f)
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|| (code_point >= 0x2c00 && code_point <= 0x2fef)
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|| (code_point >= 0x3001 && code_point <= 0xD7ff)
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|| (code_point >= 0xf900 && code_point <= 0xfdcf)
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|| (code_point >= 0xfdf0 && code_point <= 0xfffd)
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|| (code_point >= 0x10000 && code_point <= 0xeffff);
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}
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// https://html.spec.whatwg.org/multipage/custom-elements.html#valid-custom-element-name
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bool is_valid_custom_element_name(StringView name)
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{
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// name must not be any of the following:
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if (name.is_one_of(
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"annotation-xml"sv,
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"color-profile"sv,
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"font-face"sv,
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"font-face-src"sv,
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"font-face-uri"sv,
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"font-face-format"sv,
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"font-face-name"sv,
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"missing-glyph"sv)) {
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return false;
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}
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// name must match the PotentialCustomElementName production:
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// PotentialCustomElementName ::=
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// [a-z] (PCENChar)* '-' (PCENChar)*
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auto code_points = Utf8View { name };
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auto it = code_points.begin();
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if (code_points.is_empty() || *it < 'a' || *it > 'z')
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return false;
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++it;
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bool found_hyphen = false;
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for (; it != code_points.end(); ++it) {
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if (!is_pcen_char(*it))
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return false;
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if (*it == '-')
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found_hyphen = true;
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}
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return found_hyphen;
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}
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}
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