97 lines
2.3 KiB
JavaScript
97 lines
2.3 KiB
JavaScript
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'use strict'
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const arrayify = require('array-back')
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const option = require('./option')
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/**
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* Handles parsing different argv notations
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*
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* @module argv
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* @private
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*/
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class Argv extends Array {
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load (argv) {
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if (argv) {
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argv = arrayify(argv)
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} else {
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/* if no argv supplied, assume we are parsing process.argv */
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argv = process.argv.slice(0)
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argv.splice(0, 2)
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}
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argv.forEach(arg => this.push(String(arg)))
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}
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clear () {
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this.length = 0
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}
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/**
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* expand --option=value style args. The value is clearly marked to indicate it is definitely a value (which would otherwise be unclear if the value is `--value`, which would be parsed as an option). The special marker is removed in parsing phase.
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*/
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expandOptionEqualsNotation () {
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const optEquals = option.optEquals
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if (this.some(optEquals.test.bind(optEquals))) {
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const expandedArgs = []
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this.forEach(arg => {
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const matches = arg.match(optEquals)
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if (matches) {
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expandedArgs.push(matches[1], option.VALUE_MARKER + matches[2])
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} else {
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expandedArgs.push(arg)
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}
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})
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this.clear()
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this.load(expandedArgs)
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}
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}
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/**
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* expand getopt-style combined options
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*/
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expandGetoptNotation () {
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const findReplace = require('find-replace')
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const combinedArg = option.combined
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const hasGetopt = this.some(combinedArg.test.bind(combinedArg))
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if (hasGetopt) {
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findReplace(this, combinedArg, arg => {
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arg = arg.slice(1)
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return arg.split('').map(letter => '-' + letter)
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})
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}
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}
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/**
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* Inspect the user-supplied options for validation issues.
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* @throws `UNKNOWN_OPTION`
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*/
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validate (definitions, options) {
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options = options || {}
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let invalidOption
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if (!options.partial) {
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const optionWithoutDefinition = this
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.filter(arg => option.isOption(arg))
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.some(arg => {
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if (definitions.get(arg) === undefined) {
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invalidOption = arg
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return true
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}
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})
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if (optionWithoutDefinition) {
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halt(
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'UNKNOWN_OPTION',
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'Unknown option: ' + invalidOption
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)
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}
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}
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}
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}
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function halt (name, message) {
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const err = new Error(message)
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err.name = name
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throw err
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}
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module.exports = Argv
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