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use std::collections::HashMap;
use std::env;
use std::fs::File;
use std::io::{BufRead, BufReader, Read, Write};
use std::path::Path;
use abnf_to_pest::{abnf_to_pest, PestRuleSettings};
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 | Infinity_raw | NaN_raw
}}"
)?;
writeln!(
&mut file,
"final_expression = {{ SOI ~ complete_expression ~ EOI }}"
)?;
// Generate pest parser manually to avoid spurious recompilations
let derived = {
let pest_path = "dhall.pest";
let pest = quote::quote! {
#[grammar = #pest_path]
pub struct DhallParser;
};
pest_generator::derive_parser(pest, false)
};
let out_dir = env::var("OUT_DIR").unwrap();
let grammar_path = Path::new(&out_dir).join("grammar.rs");
let mut file = File::create(grammar_path)?;
writeln!(file, "pub struct DhallParser;\n{}", derived,)?;
Ok(())
}
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