ams/lib/processors/jstransport.js

ams - asset management system - plugin enabled build tool with jquery like API

/*
 * Javascript processor.
 *
 * Wrap js module with transport string.
 * It enables you to use commonjs module system on the client,
 * automatically generate module id from file path and inject require,
 * exports and module as private variables into the module closure.
 */

var parse = require('../deps').parse,
    resolvePath = require('../utils').resolvePath,
    extname = require('path').extname;

/**
 * Default options.
 * @type {Object}
 * @export
 */
exports.options = {
    pattern: /\.js$/
};

/**
 * CommonJS wrapper
 * @param {string} id module id.
 * @param {Array} deps dependencies array.
 * @param {string} body module body.
 * @return {strung} wrapped module string.
 */
function tmpl(id, deps, body) {
    return ';define("'+ id +'", ' + '["' + deps.join('", "') + '"]' + ', ' +
          'function(require, exports, module) {\n' +
              body +
          '\n});\n';
}

/**
 * Wrap module with transport function string.
 * @param {string} path path to file.
 * @param {string} data module body.
 * @param {Object} o current configuration.
 * @this Build
 * @return {string} wraped module string.
 * @export
 */
exports.run = function(path, data, o) {
    var self = this,
        deps;

    if (o && o.parseFilter && o.parseFilter.test(path)) {
        deps = [];
    } else {
        deps = parse(data);
    }

    // check if paths exist
    deps.forEach(function(dep) {
        if (self.aliases[dep]) {
            dep = self.aliases[dep];
        }
        resolvePath(dep, path, self.root, self.paths);
    });

    // convert abs path to relative one
    if (path.substr(0, 1) === '/') {
        this.paths.forEach(function(lookupPath) {
            path = path.replace(lookupPath, '');
        });
        // if the lookupPath defined with slash at the end
        // f.e. /my/lib/
        if (path.substr(0, 1) === '/') {
            path = path.substr(1);
        }
    }

    // remove ext from the name
    path = path.substr(0, path.length - extname(path).length);


    deps.unshift('require', 'exports', 'module');

    return tmpl(path, deps, data);
};