grunt-flag-parser

grunt-flag-parser.js

var _  = require('lodash');

/***
 *
 * parser used to work with http://gruntjs.com/api/grunt.option
 *
 *
 * Author marcio.reis@outlook.com
 *
 * - supports boolean params
 *    example:  grunt build --ios
 *              will return { ios: true }
 * - automatically parses values to float/int from arguments.
 *   if you want a numeric value to stay a string just use quotes when you provide the value
 *    example:
 *      --flag=1.1      this will be parsed as float number   { flag: 1.1 }
 *      --flag="1.1"    this will stay as it was              { flag: "1.1" }
 *
 */

/*
 Parser function which takes the output of `grunt.option.flags()` and transform it in a object<key,value<
 @param arr {array}
 @return object<key,value>
 */
function parser(arr){
    var params = {};
    _.each(arr, function(valueLv1, keyLv1){
        valueLv1 = valueLv1.split('--');
        _.each(valueLv1, function(valueLv2, keyLv2){
            valueLv2 = valueLv2.split('=');
            if (valueLv2.length == 1){
                if (valueLv2[0]){
                    params[valueLv2[0]] = true;
                }
            } else {
              if (!valueLv2[1]){
                params[valueLv2[0]] = true;
              } else {
                params[valueLv2[0]] = parseIntIsNum(valueLv2[1]);
              }
            }
        })
    });

    return params;
}

var regexNum = new RegExp("^([\\d]+)?(?:(.[\\d]+))$","g");


function parseIntIsNum(value){
    var isQuoted = false; //nums can be forced to stay as strings
    if (value){
        value = value.trim();

        var startsWidthQuote = false;
        var firstQuoteType = "";
        var endsWithQuote = false;

        if (value[0] === "\""  || value[0] === "\'"){
            startsWidthQuote = true;
            firstQuoteType = value[0];
        }

        if (startsWidthQuote){
            endsWithQuote = value[value.length - 1] == firstQuoteType;
        }

        if (startsWidthQuote && endsWithQuote){
            isQuoted = true;
        }
    }
    if (isQuoted){
        return value = value.slice(1,value.length-1);
    } else {
        return value ? (regexNum.test(value) ? parseFloat(value) : value) : false;
    }
}

module.exports = parser;