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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<String, PestRuleSettings> = 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(())
}
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