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#![recursion_limit = "192"]
#[macro_use]
extern crate quote;
use std::io;
use std::io::prelude::*;
use std::path::{Path, PathBuf};
use std::convert::AsRef;
use std::fs::File;
use std::process::exit;
use std::env;
mod translate;
mod grammar;
pub fn compile(input: &str) -> Result<String, String> {
let grammar_def = match grammar::grammar(&input) {
Ok(g) => g,
Err(msg) => {
return Err(format!("Error parsing language specification: {}", msg))
}
};
let output_tokens = translate::compile_grammar(&grammar_def);
Ok(output_tokens?.to_string())
}
pub fn cargo_build<T: AsRef<Path> + ?Sized>(input_path: &T) {
let mut stderr = io::stderr();
let input_path = input_path.as_ref();
let mut peg_source = String::new();
if let Err(e) = File::open(input_path).and_then(|mut x| x.read_to_string(&mut peg_source)) {
writeln!(stderr, "Could not read PEG input file `{}`: {}", input_path.display(), e).unwrap();
exit(1);
}
println!("cargo:rerun-if-changed={}", input_path.display());
let rust_source = match compile(&peg_source) {
Ok(s) => s,
Err(e) => {
writeln!(stderr, "Error compiling PEG grammar `{}`:\n\t{}", input_path.display(), e).unwrap();
exit(1);
}
};
let out_dir: PathBuf = env::var_os("OUT_DIR").unwrap().into();
let rust_path = out_dir.join(input_path.file_name().unwrap()).with_extension("rs");
let mut output_file = File::create(&rust_path).unwrap();
output_file.write_all(rust_source.as_bytes()).unwrap();
}