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LibWeb: Implement custom element name validation

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This commit is contained in:
Srikavin Ramkumar 2023-03-23 04:27:18 -04:00 • committed by Tim Flynn
parent 149e442c24
commit f2dd878fe7
3 changed files with 92 additions and 0 deletions
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76
Userland/Libraries/LibWeb/HTML/CustomElements/CustomElementName.cpp Normal file
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/*
* Copyright (c) 2023, Srikavin Ramkumar <me@srikavin.me>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/StringView.h>
#include <AK/Utf8View.h>
#include <LibWeb/HTML/CustomElements/CustomElementName.h>
namespace Web::HTML {
// https://html.spec.whatwg.org/multipage/custom-elements.html#custom-elements-core-concepts:prod-pcenchar
static bool is_pcen_char(u32 code_point)
{
return code_point == '-'
|| code_point == '.'
|| (code_point >= '0' && code_point <= '9')
|| code_point == '_'
|| (code_point >= 'a' && code_point <= 'z')
|| code_point == 0xb7
|| (code_point >= 0xc0 && code_point <= 0xd6)
|| (code_point >= 0xd8 && code_point <= 0xf6)
|| (code_point >= 0xf8 && code_point <= 0x37d)
|| (code_point >= 0x37f && code_point <= 0x1fff)
|| (code_point >= 0x200c && code_point <= 0x200d)
|| (code_point >= 0x203f && code_point <= 0x2040)
|| (code_point >= 0x2070 && code_point <= 0x218f)
|| (code_point >= 0x2c00 && code_point <= 0x2fef)
|| (code_point >= 0x3001 && code_point <= 0xD7ff)
|| (code_point >= 0xf900 && code_point <= 0xfdcf)
|| (code_point >= 0xfdf0 && code_point <= 0xfffd)
|| (code_point >= 0x10000 && code_point <= 0xeffff);
}
// https://html.spec.whatwg.org/multipage/custom-elements.html#valid-custom-element-name
bool is_valid_custom_element_name(StringView name)
{
// name must not be any of the following:
if (name.is_one_of(
"annotation-xml"sv,
"color-profile"sv,
"font-face"sv,
"font-face-src"sv,
"font-face-uri"sv,
"font-face-format"sv,
"font-face-name"sv,
"missing-glyph"sv)) {
return false;
}
// name must match the PotentialCustomElementName production:
// PotentialCustomElementName ::=
// [a-z] (PCENChar)* '-' (PCENChar)*
auto code_points = Utf8View { name };
auto it = code_points.begin();
if (code_points.is_empty() || *it < 'a' || *it > 'z')
return false;
++it;
bool found_hyphen = false;
for (; it != code_points.end(); ++it) {
if (!is_pcen_char(*it))
return false;
if (*it == '-')
found_hyphen = true;
}
return found_hyphen;
}
}