assetgraph-builder-esprima/lib/transforms/registerLabelsAsCustomProtocols.js

Build system for web sites and applications

var _ = require('lodash'),
    resolvers = require('../resolvers'),
    seq = require('seq'),
    urlTools = require('urltools');

module.exports = function (labelDefinitions, options) {
    options = options || {};
    if (!labelDefinitions) {
        labelDefinitions = [];
    } else if (_.isString(labelDefinitions)) {
        labelDefinitions = [labelDefinitions];
    }
    if (_.isArray(labelDefinitions)) {
        labelDefinitions = labelDefinitions.map(function (labelDefinition) {
            if (_.isString(labelDefinition)) {
                var matchNameTypeAndUrl = labelDefinition.match(/^([^:=]+)(?::([^=]+))?=(.*)$/);
                if (!matchNameTypeAndUrl) {
                    throw new Error('transforms.registerLabelsAsCustomProtocols: Invalid label definition syntax: ' + labelDefinition);
                }
                labelDefinition = {
                    name: matchNameTypeAndUrl[1],
                    type: matchNameTypeAndUrl[2] || null,
                    url: matchNameTypeAndUrl[3]
                };
            } else if (typeof labelDefinition !== 'object' || labelDefinition === null) {
                throw new Error('transforms.registerLabelsAsCustomProtocols: Invalid label definition: ' + labelDefinition);
            }
            if (!('url' in labelDefinition) || !('name' in labelDefinition)) {
                throw new Error('transforms.registerLabelsAsCustomProtocols: \'name\' and \'url\' options are mandatory.');
            }
            if (labelDefinition.type && !(labelDefinition.type in resolvers)) {
                throw new Error('transforms.registerLabelsAsCustomProtocols: Unknown resolver type: ' + labelDefinition.type);
            }
            return labelDefinition;
        });
    } else {
        throw new Error('transforms.registerLabelsAsCustomProtocols: Invalid label definitions: ' + labelDefinitions);
    }

    return function registerLabelsAsCustomProtocols(assetGraph, cb) {
        if (options.installFindParentDirectoryAsDefault) {
            assetGraph.defaultResolver = resolvers.findParentDirectory();
        }

        seq(labelDefinitions)
            .parEach(function (labelDefinition) {
                var resolverName = labelDefinition.type || (/\.jsb\d+$/.test(labelDefinition.url) ? 'senchaJsBuilder' : 'fixedDirectory');

                try {
                    assetGraph.resolverByProtocol[labelDefinition.name] = resolvers[resolverName](urlTools.fsFilePathToFileUrl(labelDefinition.url));
                } catch (err) {
                    err.message = 'transforms.registerLabelsAsCustomProtocols: Error initializing resolver: ' + err.message;
                    return this(err);
                }
                this();
            })
            .seq(function () {
                cb();
            })['catch'](cb);
    };
};