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//! Standalone version of rust-peg used for bootstrapping the meta-grammar
extern crate proc_macro;
extern crate proc_macro2;
extern crate quote;
use std::env;
use std::fs::File;
use std::io::{stderr, stdin, stdout};
use std::io::{Read, Write};
use std::path::Path;
use std::process;
// This can't use the `peg` crate as it would be a circular dependency, but the generated code in grammar.rs
// requires `::peg` paths.
extern crate peg_runtime as peg;
mod analysis;
mod ast;
mod grammar;
mod tokens;
mod translate;
fn main() {
let args = env::args_os().collect::<Vec<_>>();
let progname = &args[0];
let mut log = stderr();
let mut source = String::new();
if args.len() == 2 && &args[1] != "-h" {
File::open(Path::new(&args[1]))
.unwrap()
.read_to_string(&mut source)
.unwrap();
} else if args.len() == 1 {
stdin().read_to_string(&mut source).unwrap();
} else {
writeln!(log, "Usage: {} [file]", progname.to_string_lossy()).unwrap();
process::exit(0);
}
let source_tokens = source.parse().expect("Error tokenizing input");
let input_tokens = tokens::FlatTokenStream::new(source_tokens);
let grammar = match grammar::peg::peg_grammar(&input_tokens) {
Ok(g) => g,
Err(err) => {
eprintln!("Failed to parse grammar: expected {}", err.expected);
process::exit(1);
}
};
let parser_tokens = translate::compile_grammar(&grammar);
let mut out = stdout();
writeln!(&mut out, "// Generated by rust-peg. Do not edit.").unwrap();
write!(&mut out, "{}", parser_tokens).unwrap();
}
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