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Diffstat (limited to 'vendor/ucd-parse/src/emoji_properties.rs')
-rw-r--r-- | vendor/ucd-parse/src/emoji_properties.rs | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/vendor/ucd-parse/src/emoji_properties.rs b/vendor/ucd-parse/src/emoji_properties.rs new file mode 100644 index 000000000..dc5c0c884 --- /dev/null +++ b/vendor/ucd-parse/src/emoji_properties.rs @@ -0,0 +1,86 @@ +use std::path::{Path, PathBuf}; +use std::str::FromStr; + +use crate::common::{ + parse_codepoint_association, CodepointIter, Codepoints, UcdFile, + UcdFileByCodepoint, +}; +use crate::error::Error; + +/// A single row in the `emoji-data.txt` file. +/// +/// The `emoji-data.txt` file is the source of truth on several Emoji-related +/// Unicode properties. +/// +/// Note that `emoji-data.txt` is not formally part of the Unicode Character +/// Database. You can download the Emoji data files separately here: +/// https://unicode.org/Public/emoji/ +#[derive(Clone, Debug, Default, Eq, PartialEq)] +pub struct EmojiProperty { + /// The codepoint or codepoint range for this entry. + pub codepoints: Codepoints, + /// The property name assigned to the codepoints in this entry. + pub property: String, +} + +impl UcdFile for EmojiProperty { + fn relative_file_path() -> &'static Path { + Path::new("emoji/emoji-data.txt") + } + + fn file_path<P: AsRef<Path>>(ucd_dir: P) -> PathBuf { + let ucd_dir = ucd_dir.as_ref(); + // The standard location, but only on UCDs from 13.0.0 and up. + let std = ucd_dir.join(Self::relative_file_path()); + if std.exists() { + std + } else { + // If the old location does exist, use it. + let legacy = ucd_dir.join("emoji-data.txt"); + if legacy.exists() { + legacy + } else { + // This might end up in an error message, so use the standard + // one if forced to choose. Arguably we could do something like + // peek + std + } + } + } +} + +impl UcdFileByCodepoint for EmojiProperty { + fn codepoints(&self) -> CodepointIter { + self.codepoints.into_iter() + } +} + +impl FromStr for EmojiProperty { + type Err = Error; + + fn from_str(line: &str) -> Result<EmojiProperty, Error> { + let (codepoints, property) = parse_codepoint_association(line)?; + Ok(EmojiProperty { codepoints, property: property.to_string() }) + } +} + +#[cfg(test)] +mod tests { + use super::EmojiProperty; + + #[test] + fn parse_single() { + let line = "24C2 ; Emoji # 1.1 [1] (Ⓜ️) circled M\n"; + let row: EmojiProperty = line.parse().unwrap(); + assert_eq!(row.codepoints, 0x24C2); + assert_eq!(row.property, "Emoji"); + } + + #[test] + fn parse_range() { + let line = "1FA6E..1FFFD ; Extended_Pictographic# NA[1424] (️..️) <reserved-1FA6E>..<reserved-1FFFD>\n"; + let row: EmojiProperty = line.parse().unwrap(); + assert_eq!(row.codepoints, (0x1FA6E, 0x1FFFD)); + assert_eq!(row.property, "Extended_Pictographic"); + } +} |