express-hogan/lib/express.js

Hogan.js NPM package for express 3.x

/*
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

/**
 *  Express 3.x support.
 */
var fs = require('fs');
var _path = require('path');
var ctx = {};


module.exports = function (Hogan) {
  if (typeof Hogan === 'undefined'
    || typeof Hogan.scan === 'undefined'
    || typeof Hogan.parse === 'undefined'
    || typeof Hogan.generate === 'undefined') {
      throw new Error('please, require Hogan!');
  }

  Hogan.fcache = {};

  Hogan.fcompile = function (path, options) {
    options = options || {};
    options.filename = path;

    var key = path + ':string';

    if (options.cache && Hogan.fcache[key]) {
      return Hogan.fcache[key];
    }

      var text = fs.readFileSync(path, 'utf8');
    
    try { 
      var rt = Hogan.generate(Hogan.parse(Hogan.scan(text, options.delimiters), text, options), text, options);
    } catch (error) {
      throw new Error('missing read template file : '+path);
    }

    return options.cache ? Hogan.fcache[key] = rt : rt;
  };

  renderPartials = function(partials, opt) {
    var name, path, result;
    result = {};
    for (name in partials) {
      path = partials[name];
      if (typeof path !== 'string') {
        continue;
      }
      if (!_path.extname(path)) {
         path += ctx.ext;
      }
      path = ctx.lookup(path);
      result[name] = Hogan.fcompile(path,opt);
    }
    return result;
  };


  Hogan.renderFile = function (path, options, fn) {
    ctx = this;
    try {
      var partials = renderPartials(options.partials);
      fn(null, Hogan.fcompile(path,options).render(options,partials));
    } catch (error) {
      fn(error);
    }
  };

  Hogan.__express = Hogan.renderFile;

  return Hogan;
}