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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");
}
}
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