gulp-crometrics/lib/transforms/optimizelify.js

Predefined Gulp Tasks for CROmetrics (fork of gulp-clearhead)

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _uglifyJs = require('uglify-js');

var _uglifyJs2 = _interopRequireDefault(_uglifyJs);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

var concat = String.prototype.concat.bind('');

function optimizelify(code) {
  var forceDirective = '/* _optimizely_evaluate=force */';
  var jshint = {
    start: '\n\/*jshint ignore:start*\/\n',
    end: '\n\/*jshint ignore:end*\/'
  };

  var safeLoop = parseSafeLoop(code);

  var regex = /\/\*\s?_optimizely_evaluate\=force\s?\*\/\n*/i;
  var forceLoop = code.replace(regex, '').replace(safeLoop, '');
  var uglified = _uglifyJs2.default.minify(forceLoop, { fromString: true });

  return concat(forceDirective, jshint.start, uglified.code, jshint.end, safeLoop);
}

function parseSafeLoop(code) {
  var regex = /\n\/\*\s?_optimizely_evaluate\=safe\s?\*\/([\S\s]{0,})/i;
  var safeLoop = (code.match(regex) || [])[0] || '';
  var begIdx = code.indexOf(safeLoop);
  var endIdx = begIdx + safeLoop.indexOf('\n},{');

  return code.substring(begIdx, endIdx);
}

exports.default = optimizelify;