use std::fs::File; use std::io::{Read,Write,BufReader,BufRead}; use std::collections::HashMap; use abnf_to_pest::{PestRuleSettings, abnf_to_pest}; fn main() -> std::io::Result<()> { // TODO: upstream changes to grammar // let abnf_path = "../dhall-lang/standard/dhall.abnf"; let abnf_path = "src/dhall.abnf"; let visibility_path = "src/dhall.pest.visibility"; let pest_path = "src/dhall.pest"; println!("cargo:rerun-if-changed={}", abnf_path); println!("cargo:rerun-if-changed={}", visibility_path); let mut file = File::open(abnf_path)?; let mut data = Vec::new(); file.read_to_end(&mut data)?; data.push('\n' as u8); let mut rule_settings: HashMap = HashMap::new(); for line in BufReader::new(File::open(visibility_path)?).lines() { let line = line?; if line.len() >= 2 && &line[0..2] == "# " { rule_settings.insert(line[2..].into(), PestRuleSettings { visible: false, ..Default::default() }); } else { rule_settings.insert(line, PestRuleSettings { visible: true, ..Default::default() }); } } rule_settings.insert("simple_label".to_owned(), PestRuleSettings { visible: true, replace: Some(" keyword_raw ~ simple_label_next_char+ | !keyword_raw ~ simple_label_first_char ~ simple_label_next_char* ".to_owned()), }); let mut file = File::create(pest_path)?; writeln!(&mut file, "// AUTO-GENERATED FILE. See build.rs.")?; writeln!(&mut file, "{}", abnf_to_pest(&data, &rule_settings)?)?; writeln!(&mut file, "keyword_raw = _{{ let_raw | in_raw | if_raw | then_raw | else_raw }}")?; writeln!(&mut file, "final_expression = {{ SOI ~ complete_expression ~ EOI }}")?; Ok(()) }