grunt-run-grunt/lib/parsers.js

Grunt task to run Gruntfiles in a child process. Gruntception!

'use strict';

// TODO: swap this for XRegExp
const startExp = /(?:\r\n|\r|\n){2}Available tasks(?:\r\n|\r|\n)/g;
const taskExp = /[ ]{2}[ ]*([\w_-]+)[ ]{2}([ \w_"'-]+?)[ ]\*[ ]*(?:\r\n|\r|\n)/g;

// without delimiting first and last quote
const aliasRegExp = / +([\w_:-]+)  Alias for "([\S \t]+(?:",\s+"[\S \t]+)*?)"\s+tasks?.+(?:\r\n|\r|\n)/g;

function parseHelp(output) {
  const result = {
    task: {},
    alias: {}
  };

  let elementMatch;
  let nextI = 0;

  startExp.lastIndex = 0;
  const startMatch = startExp.exec(output);

  if (startMatch) {
    nextI = startMatch.index + startMatch[0].length;

    // tasks
    taskExp.lastIndex = nextI;
    while ((elementMatch = taskExp.exec(output))) {
      nextI = elementMatch.index + elementMatch[0].length;
      taskExp.lastIndex = nextI;
      // TODO add proper map object
      result.task[elementMatch[1]] = String(elementMatch[2]);
    }

    // aliases
    aliasRegExp.lastIndex = nextI;
    while ((elementMatch = aliasRegExp.exec(output))) {
      nextI = elementMatch.index + elementMatch[0].length;
      aliasRegExp.lastIndex = nextI;
      // TODO add proper map object
      // restore quotes and parse as JSON array
      result.alias[elementMatch[1]] = JSON.parse('["' + elementMatch[2] + '"]');
    }
  }

  return result;
}

module.exports = {
  parseHelp: parseHelp
};