sourcemap 2.2.1

Basic sourcemap handling for Rust
Documentation 
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extern crate sourcemap;

use std::env;
use std::fs;
use std::io::Read;

use sourcemap::{decode, DecodedMap, RewriteOptions, SourceMap};


fn load_from_reader<R: Read>(mut rdr: R) -> SourceMap {
    match decode(&mut rdr).unwrap() {
        DecodedMap::Regular(sm) => sm,
        DecodedMap::Index(idx) => {
            idx.flatten_and_rewrite(&RewriteOptions {
                    load_local_source_contents: true,
                    ..Default::default()
                })
                .unwrap()
        }
    }
}

fn main() {
    let args: Vec<_> = env::args().collect();
    let mut f = fs::File::open(&args[1]).unwrap();
    let sm = load_from_reader(&mut f);

    let line = if args.len() > 2 { args[2].parse::<u32>().unwrap() } else { 0 };
    let column = if args.len() > 3 { args[3].parse::<u32>().unwrap() } else { 0 };

    let token = sm.lookup_token(line, column).unwrap(); // line-number and column
    println!("token: {}", token);
}