mirror of
https://github.com/RGBCube/serenity
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42c272c059
This adds an option to only detect emoji that should always present as emoji. For example, the copyright symbol (unless followed by an emoji presentation selector) should render as text.
123 lines
4.4 KiB
C++
123 lines
4.4 KiB
C++
/*
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* Copyright (c) 2022-2023, Tim Flynn <trflynn89@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/CharacterTypes.h>
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#include <AK/Utf32View.h>
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#include <AK/Utf8View.h>
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#include <LibUnicode/CharacterTypes.h>
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#include <LibUnicode/Emoji.h>
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#if ENABLE_UNICODE_DATA
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# include <LibUnicode/UnicodeData.h>
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#endif
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namespace Unicode {
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Optional<Emoji> __attribute__((weak)) find_emoji_for_code_points(ReadonlySpan<u32>) { return {}; }
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#if ENABLE_UNICODE_DATA
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// https://unicode.org/reports/tr51/#def_emoji_core_sequence
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static bool could_be_start_of_emoji_core_sequence(u32 code_point, Optional<u32> const& next_code_point, SequenceType type)
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{
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// emoji_core_sequence := emoji_character | emoji_presentation_sequence | emoji_keycap_sequence | emoji_modifier_sequence | emoji_flag_sequence
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static constexpr auto emoji_presentation_selector = 0xFE0Fu;
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static constexpr auto combining_enclosing_keycap = 0x20E3u;
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// https://unicode.org/reports/tr51/#def_emoji_keycap_sequence
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// emoji_keycap_sequence := [0-9#*] \x{FE0F 20E3}
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if (is_ascii_digit(code_point) || code_point == '#' || code_point == '*')
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return next_code_point == emoji_presentation_selector || next_code_point == combining_enclosing_keycap;
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// A little non-standard, but all other ASCII code points are not the beginning of any emoji sequence.
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if (is_ascii(code_point))
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return false;
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// https://unicode.org/reports/tr51/#def_emoji_character
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switch (type) {
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case SequenceType::Any:
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if (code_point_has_property(code_point, Property::Emoji))
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return true;
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break;
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case SequenceType::EmojiPresentation:
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if (code_point_has_property(code_point, Property::Emoji_Presentation))
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return true;
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break;
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}
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// https://unicode.org/reports/tr51/#def_emoji_presentation_sequence
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// emoji_presentation_sequence := emoji_character emoji_presentation_selector
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if (next_code_point == emoji_presentation_selector)
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return true;
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// https://unicode.org/reports/tr51/#def_emoji_modifier_sequence
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// emoji_modifier_sequence := emoji_modifier_base emoji_modifier
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if (code_point_has_property(code_point, Property::Emoji_Modifier_Base))
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return true;
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// https://unicode.org/reports/tr51/#def_emoji_flag_sequence
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// emoji_flag_sequence := regional_indicator regional_indicator
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if (code_point_has_property(code_point, Property::Regional_Indicator))
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return true;
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return false;
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}
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static bool could_be_start_of_serenity_emoji(u32 code_point)
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{
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// We use Supplementary Private Use Area-B for custom Serenity emoji, starting at U+10CD00.
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static constexpr auto first_custom_serenity_emoji_code_point = 0x10CD00u;
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return code_point >= first_custom_serenity_emoji_code_point;
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}
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#endif
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// https://unicode.org/reports/tr51/#def_emoji_sequence
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template<typename CodePointIterator>
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static bool could_be_start_of_emoji_sequence_impl(CodePointIterator const& it, [[maybe_unused]] SequenceType type)
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{
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// emoji_sequence := emoji_core_sequence | emoji_zwj_sequence | emoji_tag_sequence
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if (it.done())
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return false;
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#if ENABLE_UNICODE_DATA
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// The purpose of this method is to quickly filter out code points that cannot be the start of
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// an emoji. The emoji_core_sequence definition alone captures the start of all possible
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// emoji_zwj_sequence and emoji_tag_sequence emojis, because:
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//
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// * emoji_zwj_sequence must begin with emoji_zwj_element, which is:
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// emoji_zwj_sequence := emoji_core_sequence | emoji_tag_sequence
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//
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// * emoji_tag_sequence must begin with tag_base, which is:
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// tag_base := emoji_character | emoji_modifier_sequence | emoji_presentation_sequence
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// Note that this is a subset of emoji_core_sequence.
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auto code_point = *it;
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auto next_code_point = it.peek(1);
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if (could_be_start_of_emoji_core_sequence(code_point, next_code_point, type))
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return true;
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if (could_be_start_of_serenity_emoji(code_point))
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return true;
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return false;
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#else
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return true;
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#endif
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}
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bool could_be_start_of_emoji_sequence(Utf8CodePointIterator const& it, SequenceType type)
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{
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return could_be_start_of_emoji_sequence_impl(it, type);
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}
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bool could_be_start_of_emoji_sequence(Utf32CodePointIterator const& it, SequenceType type)
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{
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return could_be_start_of_emoji_sequence_impl(it, type);
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}
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}
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