74 lines
2.6 KiB
Rust
74 lines
2.6 KiB
Rust
const LINE_BREAK_TABLE_URL: &str = "http://www.unicode.org/Public/UCD/latest/ucd/LineBreak.txt";
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use std::fs::File;
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use std::io::prelude::*;
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use std::io::BufReader;
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use std::path::{Path, PathBuf};
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use std::process::Command;
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include!("src/types.rs");
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fn main() -> Result<(), std::io::Error> {
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let mod_path = Path::new("src/tables.rs");
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if mod_path.exists() {
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eprintln!(
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"{} already exists, delete it if you want to replace it.",
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mod_path.display()
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);
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std::process::exit(0);
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}
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let mut tmpdir_path = PathBuf::from(
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std::str::from_utf8(&Command::new("mktemp").arg("-d").output()?.stdout)
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.unwrap()
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.trim(),
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);
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tmpdir_path.push("LineBreak.txt");
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Command::new("curl")
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.args(&["-o", tmpdir_path.to_str().unwrap(), LINE_BREAK_TABLE_URL])
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.output()?;
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let file = File::open(&tmpdir_path)?;
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let buf_reader = BufReader::new(file);
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let mut line_break_table: Vec<(u32, u32, LineBreakClass)> = Vec::with_capacity(3800);
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for line in buf_reader.lines() {
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let line = line.unwrap();
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if line.starts_with('#') || line.starts_with(' ') || line.is_empty() {
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continue;
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}
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let tokens: &str = line.split_whitespace().next().unwrap();
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let semicolon_idx: usize = tokens.chars().position(|c| c == ';').unwrap();
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/* LineBreak.txt list is ascii encoded so we can assume each char takes one byte: */
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let chars_str: &str = &tokens[..semicolon_idx];
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let mut codepoint_iter = chars_str.split("..");
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let first_codepoint: u32 =
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u32::from_str_radix(std::dbg!(codepoint_iter.next().unwrap()), 16).unwrap();
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let sec_codepoint: u32 = codepoint_iter
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.next()
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.map(|v| u32::from_str_radix(std::dbg!(v), 16).unwrap())
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.unwrap_or(first_codepoint);
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let class = &tokens[semicolon_idx + 1..semicolon_idx + 1 + 2];
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line_break_table.push((first_codepoint, sec_codepoint, LineBreakClass::from(class)));
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}
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let mut file = File::create(&mod_path)?;
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file.write_all(b"use crate::types::LineBreakClass::*;\n")
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.unwrap();
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file.write_all(b"use crate::types::LineBreakClass;\n\n")
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.unwrap();
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file.write_all(b"const line_break_rules: &'static [(u32, u32, LineBreakClass)] = &[\n")
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.unwrap();
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for l in &line_break_table {
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file.write_all(format!(" (0x{:X}, 0x{:X}, {:?}),\n", l.0, l.1, l.2).as_bytes())
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.unwrap();
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}
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file.write_all(b"];").unwrap();
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std::fs::remove_file(&tmpdir_path).unwrap();
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tmpdir_path.pop();
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std::fs::remove_dir(&tmpdir_path).unwrap();
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Ok(())
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}
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