precis_tools/generators/
unicode_version.rs

1use crate::error::Error;
2use crate::generators::CodeGen;
3use lazy_static::lazy_static;
4use regex::Regex;
5use std::fs::File;
6use std::io::Write;
7
8/// Generates the UNICODE version variable used to generate
9/// the library.
10pub struct UnicodeVersionGen {
11    version: String,
12}
13
14impl UnicodeVersionGen {
15    /// Creates a new generator for the Unicode version to generate tables
16    pub fn new(version: &str) -> Self {
17        Self {
18            version: String::from(version),
19        }
20    }
21}
22
23fn get_version(version: &str) -> Result<(u64, u64, u64), Error> {
24    lazy_static! {
25        static ref VERSION_RX: Regex = Regex::new(r"([0-9]+).([0-9]+).([0-9]+)").unwrap();
26    }
27
28    let caps = match VERSION_RX.captures(version) {
29        Some(c) => c,
30        None => return err!("Failed to find version in '{}'", version),
31    };
32
33    let capture_to_num = |n| {
34        caps.get(n)
35            .unwrap()
36            .as_str()
37            .parse::<u64>()
38            .map_err(|_e| Error {
39                mesg: format!("Failed to parse version from '{:?}'", version),
40                line: Some(0),
41                path: None,
42            })
43    };
44    let major = capture_to_num(1)?;
45    let minor = capture_to_num(2)?;
46    let patch = capture_to_num(3)?;
47
48    Ok((major, minor, patch))
49}
50
51impl CodeGen for UnicodeVersionGen {
52    fn generate_code(&mut self, file: &mut File) -> Result<(), Error> {
53        let (major, minor, patch) = get_version(&self.version)?;
54        writeln!(
55            file,
56            "/// The [Unicode version](http://www.unicode.org/versions) of data"
57        )?;
58        writeln!(
59            file,
60            "pub const UNICODE_VERSION: (u8, u8, u8) = ({}, {}, {});",
61            major, minor, patch
62        )?;
63        Ok(writeln!(file)?)
64    }
65}
precis_tools/generators/unicode_version.rs

precis_tools/generators/
unicode_version.rs
