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use std::path::Path;
use std::str::FromStr;
use once_cell::sync::Lazy;
use regex::Regex;
use crate::common::{CodepointIter, Codepoints, UcdFile, UcdFileByCodepoint};
use crate::error::Error;
/// A single row in the `extracted/DerivedNumericValues.txt` file.
///
/// This file gives the derived values of the Numeric_Value property.
#[derive(Clone, Debug, Default, Eq, PartialEq)]
pub struct DerivedNumericValues {
/// The codepoint or codepoint range for this entry.
pub codepoints: Codepoints,
/// The approximate Numeric_Value of the codepoints in this entry,
/// as a decimal.
pub numeric_value_decimal: String,
/// The exact Numeric_Value of the codepoints in this entry, as
/// a fraction.
pub numeric_value_fraction: String,
}
impl UcdFile for DerivedNumericValues {
fn relative_file_path() -> &'static Path {
Path::new("extracted/DerivedNumericValues.txt")
}
}
impl UcdFileByCodepoint for DerivedNumericValues {
fn codepoints(&self) -> CodepointIter {
self.codepoints.into_iter()
}
}
impl FromStr for DerivedNumericValues {
type Err = Error;
fn from_str(line: &str) -> Result<DerivedNumericValues, Error> {
static PARTS: Lazy<Regex> = Lazy::new(|| {
Regex::new(
r"(?x)
^
\s*(?P<codepoints>[^\s;]+)\s*;
\s*(?P<numeric_value_decimal>[^\s;]+)\s*;
\s*;
\s*(?P<numeric_value_fraction>[^\s;]+)\s*
",
)
.unwrap()
});
let caps = match PARTS.captures(line.trim()) {
Some(caps) => caps,
None => return err!("invalid PropList line: '{}'", line),
};
let codepoints = caps["codepoints"].parse()?;
let numeric_value_decimal = caps["numeric_value_decimal"].to_string();
let numeric_value_fraction =
caps["numeric_value_fraction"].to_string();
Ok(DerivedNumericValues {
codepoints,
numeric_value_decimal,
numeric_value_fraction,
})
}
}
#[cfg(test)]
mod tests {
use super::DerivedNumericValues;
#[test]
fn parse_single() {
let line = "0030 ; 0.0 ; ; 0 # Nd DIGIT ZERO\n";
let row: DerivedNumericValues = line.parse().unwrap();
assert_eq!(row.codepoints, 0x0030);
assert_eq!(row.numeric_value_decimal, "0.0");
assert_eq!(row.numeric_value_fraction, "0");
}
#[test]
fn parse_range() {
let line = "11FC9..11FCA ; 0.0625 ; ; 1/16 # No [2] TAMIL FRACTION ONE SIXTEENTH-1..TAMIL FRACTION ONE SIXTEENTH-2\n";
let row: DerivedNumericValues = line.parse().unwrap();
assert_eq!(row.codepoints, (0x11FC9, 0x11FCA));
assert_eq!(row.numeric_value_decimal, "0.0625");
assert_eq!(row.numeric_value_fraction, "1/16");
}
}
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