1use std::path::Path;
2
3use crate::{
4 common::{
5 parse_codepoint_association, CodepointIter, Codepoints, UcdFile,
6 UcdFileByCodepoint,
7 },
8 error::Error,
9};
10
11/// A single row in the `EastAsianWidth.txt` file, describing the value of the
12/// `East_Asian_Width` property.
13///
14/// Note: All code points, assigned or unassigned, that are not listed in
15/// EastAsianWidth.txt file are given the value "N".
16#[derive(Clone, Debug, Default, Eq, PartialEq)]
17pub struct EastAsianWidth {
18 /// The codepoint or codepoint range for this entry.
19 pub codepoints: Codepoints,
20 /// One of "A", "F", "H", "N", "Na", "W".
21 pub width: String,
22}
23
24impl UcdFile for EastAsianWidth {
25 fn relative_file_path() -> &'static Path {
26 Path::new("EastAsianWidth.txt")
27 }
28}
29
30impl UcdFileByCodepoint for EastAsianWidth {
31 fn codepoints(&self) -> CodepointIter {
32 self.codepoints.into_iter()
33 }
34}
35
36impl std::str::FromStr for EastAsianWidth {
37 type Err = Error;
38
39 fn from_str(line: &str) -> Result<EastAsianWidth, Error> {
40 let (codepoints: Codepoints, width: &str) = parse_codepoint_association(line)?;
41 Ok(EastAsianWidth { codepoints, width: width.to_string() })
42 }
43}
44
45#[cfg(test)]
46mod tests {
47 use super::EastAsianWidth;
48
49 #[test]
50 fn parse_single() {
51 let line = "27E7;Na # Pe MATHEMATICAL RIGHT WHITE SQUARE BRACKET\n";
52 let row: EastAsianWidth = line.parse().unwrap();
53 assert_eq!(row.codepoints, 0x27E7);
54 assert_eq!(row.width, "Na");
55 }
56
57 #[test]
58 fn parse_range() {
59 let line = "1F57B..1F594;N # So [26] LEFT HAND TELEPHONE RECEIVER..REVERSED VICTORY HAND\n";
60 let row: EastAsianWidth = line.parse().unwrap();
61 assert_eq!(row.codepoints, (0x1F57B, 0x1F594));
62 assert_eq!(row.width, "N");
63 }
64}
65