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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
use unicode_properties::{emoji, EmojiStatus, UnicodeEmoji};
pub use crate::text::shaping::Shaper;
pub mod glyph;
pub mod shaping;
pub mod util;
/// Whether or not font fallback selection prefers the emoji or text representation
/// of a character. If `None` then either presentation is acceptable.
#[derive(Clone, Copy, Debug, PartialEq)]
pub enum EmojiPresentationPreference {
None,
Text,
Emoji,
}
#[derive(Clone, Copy, Debug)]
pub struct FallbackFontSelectionOptions {
pub character: char,
pub presentation_preference: EmojiPresentationPreference,
}
impl Default for FallbackFontSelectionOptions {
fn default() -> Self {
Self {
character: ' ',
presentation_preference: EmojiPresentationPreference::None,
}
}
}
impl FallbackFontSelectionOptions {
pub fn new(character: char, next_character: Option<char>) -> Self {
let presentation_preference = match next_character {
Some(next_character) if emoji::is_emoji_presentation_selector(next_character) => {
EmojiPresentationPreference::Emoji
},
Some(next_character) if emoji::is_text_presentation_selector(next_character) => {
EmojiPresentationPreference::Text
},
// We don't want to select emoji prsentation for any possible character that might be an emoji, because
// that includes characters such as '0' that are also used outside of emoji clusters. Instead, only
// select the emoji font for characters that explicitly have an emoji presentation (in the absence
// of the emoji presentation selectors above).
_ if matches!(
character.emoji_status(),
EmojiStatus::EmojiPresentation |
EmojiStatus::EmojiPresentationAndModifierBase |
EmojiStatus::EmojiPresentationAndEmojiComponent |
EmojiStatus::EmojiPresentationAndModifierAndEmojiComponent
) =>
{
EmojiPresentationPreference::Emoji
},
_ if character.is_emoji_char() => EmojiPresentationPreference::Text,
_ => EmojiPresentationPreference::None,
};
Self {
character,
presentation_preference,
}
}
}
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