File Explorer

1/*2The MIT License (MIT)3 4Copyright (c) 2014 Matteo Collina5 6Permission is hereby granted, free of charge, to any person obtaining a copy7of this software and associated documentation files (the "Software"), to deal8in the Software without restriction, including without limitation the rights9to use, copy, modify, merge, publish, distribute, sublicense, and/or sell10copies of the Software, and to permit persons to whom the Software is11furnished to do so, subject to the following conditions:12 13The above copyright notice and this permission notice shall be included in all14copies or substantial portions of the Software.15 16THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR17IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,18FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE19AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER20LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,21OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE22SOFTWARE.23*/24 25'use strict'26 27var leven = require('leven')28 29function commist () {30  var commands = []31 32  function lookup (array) {33    if (typeof array === 'string') { array = array.split(' ') }34 35    return commands.map(function (cmd) {36      return cmd.match(array)37    }).filter(function (match) {38      return match.partsNotMatched === 039    }).sort(function (a, b) {40      if (a.inputNotMatched > b.inputNotMatched) { return 1 }41 42      if (a.inputNotMatched === b.inputNotMatched && a.totalDistance > b.totalDistance) { return 1 }43 44      return -145    }).map(function (match) {46      return match.cmd47    })48  }49 50  function parse (args) {51    var matching = lookup(args)52 53    if (matching.length > 0) {54      matching[0].call(args)55 56      // return null if there is nothing left to do57      return null58    }59 60    return args61  }62 63  function register (inputCommand, func) {64    var commandOptions = {65      command: inputCommand,66      strict: false,67      func: func68    }69 70    if (typeof inputCommand === 'object') {71      commandOptions = Object.assign(commandOptions, inputCommand)72    }73 74    var matching = lookup(commandOptions.command)75 76    matching.forEach(function (match) {77      if (match.string === commandOptions.command) { throw new Error('command already registered: ' + commandOptions.command) }78    })79 80    commands.push(new Command(commandOptions))81 82    return this83  }84 85  return {86    register: register,87    parse: parse,88    lookup: lookup89  }90}91 92function Command (options) {93  this.string = options.command94  this.strict = options.strict95  this.parts = this.string.split(' ')96  this.length = this.parts.length97  this.func = options.func98 99  this.parts.forEach(function (part) {100    if (part.length < 3) { throw new Error('command words must be at least 3 chars: ' + options.command) }101  })102}103 104Command.prototype.call = function call (argv) {105  this.func(argv.slice(this.length))106}107 108Command.prototype.match = function match (string) {109  return new CommandMatch(this, string)110}111 112function CommandMatch (cmd, array) {113  this.cmd = cmd114  this.distances = cmd.parts.map(function (elem, i) {115    if (array[i] !== undefined) {116      if (cmd.strict) {117        return elem === array[i] ? 0 : undefined118      } else {119        return leven(elem, array[i])120      }121    } else { return undefined }122  }).filter(function (distance, i) {123    return distance !== undefined && distance < cmd.parts[i].length - 2124  })125 126  this.partsNotMatched = cmd.length - this.distances.length127  this.inputNotMatched = array.length - this.distances.length128  this.totalDistance = this.distances.reduce(function (acc, i) { return acc + i }, 0)129}130 131module.exports = commist132