handlebars 0.7.0

#![feature(test)]
extern crate handlebars;
extern crate rustc_serialize as serialize;
extern crate test;

use std::io::prelude::*;
use std::io::Result;
use std::fs::File;
use std::path::Path;
use std::collections::BTreeMap;

use handlebars::{Handlebars, Template};
use serialize::json::{Json, ToJson};

fn load_template_source(name: &str) -> Result<String> {
    let path = Path::new(name);

    let mut file = try!(File::open(&path));
    let mut buf = String::new();
    try!(file.read_to_string(&mut buf));
    Ok(buf)
}

fn make_data () -> BTreeMap<String, Json> {
    let mut data = BTreeMap::new();

    data.insert("year".to_string(), "2015".to_json());

    let mut teams = Vec::new();

    for v in vec![("Jiangsu", 43u16), ("Beijing", 27u16), ("Guangzhou", 22u16), ("Shandong", 12u16)].iter() {
        let (name, score) = *v;
        let mut t = BTreeMap::new();
        t.insert("name".to_string(), name.to_json());
        t.insert("score".to_string(), score.to_json());
        teams.push(t)
    }

    data.insert("teams".to_string(), teams.to_json());
    data
}

#[bench]
fn parse_template(b: &mut test::Bencher) {
    let source = load_template_source("./benches/template.hbs").ok().unwrap();
    b.iter(|| {
        Template::compile(source.clone()).ok().unwrap()
    });
}

#[bench]
fn render_template(b: &mut test::Bencher) {
    let source = load_template_source("./benches/template.hbs").ok().unwrap();

    let mut handlebars = Handlebars::new();
    handlebars.register_template_string("table", source)
        .ok().expect("Invalid template format");

    let data = make_data();
    b.iter(|| {
        handlebars.render("table", &data).ok().unwrap()
    })
}