ucd_parse/extracted/
derived_numeric_values.rs

1use std::path::Path;
2
3use crate::{
4    common::{CodepointIter, Codepoints, UcdFile, UcdFileByCodepoint},
5    error::Error,
6};
7
8/// A single row in the `extracted/DerivedNumericValues.txt` file.
9///
10/// This file gives the derived values of the Numeric_Value property.
11#[derive(Clone, Debug, Default, Eq, PartialEq)]
12pub struct DerivedNumericValues {
13    /// The codepoint or codepoint range for this entry.
14    pub codepoints: Codepoints,
15    /// The approximate Numeric_Value of the codepoints in this entry,
16    /// as a decimal.
17    pub numeric_value_decimal: String,
18    /// The exact Numeric_Value of the codepoints in this entry, as
19    /// a fraction.
20    pub numeric_value_fraction: String,
21}
22
23impl UcdFile for DerivedNumericValues {
24    fn relative_file_path() -> &'static Path {
25        Path::new("extracted/DerivedNumericValues.txt")
26    }
27}
28
29impl UcdFileByCodepoint for DerivedNumericValues {
30    fn codepoints(&self) -> CodepointIter {
31        self.codepoints.into_iter()
32    }
33}
34
35impl std::str::FromStr for DerivedNumericValues {
36    type Err = Error;
37
38    fn from_str(line: &str) -> Result<DerivedNumericValues, Error> {
39        let re_parts = regex!(
40            r"(?x)
41                ^
42                \s*(?P<codepoints>[^\s;]+)\s*;
43                \s*(?P<numeric_value_decimal>[^\s;]+)\s*;
44                \s*;
45                \s*(?P<numeric_value_fraction>[^\s;]+)\s*
46                ",
47        );
48
49        let caps = match re_parts.captures(line.trim()) {
50            Some(caps) => caps,
51            None => return err!("invalid PropList line: '{}'", line),
52        };
53        let codepoints = caps["codepoints"].parse()?;
54        let numeric_value_decimal = caps["numeric_value_decimal"].to_string();
55        let numeric_value_fraction =
56            caps["numeric_value_fraction"].to_string();
57
58        Ok(DerivedNumericValues {
59            codepoints,
60            numeric_value_decimal,
61            numeric_value_fraction,
62        })
63    }
64}
65
66#[cfg(test)]
67mod tests {
68    use super::DerivedNumericValues;
69
70    #[test]
71    fn parse_single() {
72        let line = "0030          ; 0.0 ; ; 0 # Nd       DIGIT ZERO\n";
73        let row: DerivedNumericValues = line.parse().unwrap();
74        assert_eq!(row.codepoints, 0x0030);
75        assert_eq!(row.numeric_value_decimal, "0.0");
76        assert_eq!(row.numeric_value_fraction, "0");
77    }
78
79    #[test]
80    fn parse_range() {
81        let line =  "11FC9..11FCA  ; 0.0625 ; ; 1/16 # No   [2] TAMIL FRACTION ONE SIXTEENTH-1..TAMIL FRACTION ONE SIXTEENTH-2\n";
82        let row: DerivedNumericValues = line.parse().unwrap();
83        assert_eq!(row.codepoints, (0x11FC9, 0x11FCA));
84        assert_eq!(row.numeric_value_decimal, "0.0625");
85        assert_eq!(row.numeric_value_fraction, "1/16");
86    }
87}
ucd_parse/extracted/derived_numeric_values.rs

ucd_parse/extracted/
derived_numeric_values.rs
