index.js

"use strict";

var fs = require('fs');
var espowerSource = require('espower-source');
var convert = require('convert-source-map');

var createPreprocessor = function(args, config, logger, helper) {
    config = config || {};
    var log = logger.create('preprocessor.espower');

    var defaultOptions = {}; // see https://github.com/twada/espower-source#api
    var options = helper.merge(defaultOptions, args.options || {}, config.options || {});

    var transformPath = args.transformPath || config.transformPath || function(filePath) {
        return filePath.replace(/\.js$/, '.espowered.js');
    };

    return function(content, file, done) {
        log.debug('Processing "%s".', file.originalPath);
        file.path = transformPath(file.originalPath);

        var opts = helper.merge({}, options);
        if (opts.ignoreUpstreamSourceMap && file.sourceMap) {
            log.debug("detected upstream sourceMap info, but ignoring");
        } else if (file.sourceMap) {
            log.debug("detected upstream sourceMap info");
            opts = helper.merge(opts, { sourceMap: file.sourceMap });
        }
        var modified = espowerSource(content, file.originalPath, opts);
        if (opts.emitActualCode) {
            log.debug("emit " + file.path);
            fs.writeFileSync(file.path, modified);
        }
        var commented = convert.fromSource(modified);
        if (commented) {
            file.sourceMap = commented.toObject();
        } else {
            file.sourceMap = null;
        }
        done(null, modified);
    };
};

createPreprocessor.$inject = ['args', 'config.espowerPreprocessor', 'logger', 'helper'];

module.exports = {
    'preprocessor:espower': ['factory', createPreprocessor]
};