84 lines
2.2 KiB
JavaScript
84 lines
2.2 KiB
JavaScript
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'use strict'
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const _value = new WeakMap()
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const arrayify = require('array-back')
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const t = require('typical')
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const Definition = require('./option-definition')
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/**
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* Encapsulates behaviour (defined by an OptionDefinition) when setting values
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*/
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class Option {
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constructor (definition) {
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this.definition = new Definition(definition)
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this.state = null /* set or default */
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this.resetToDefault()
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}
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get () {
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return _value.get(this)
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}
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set (val) {
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this._set(val, 'set')
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}
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_set (val, state) {
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const def = this.definition
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if (def.isMultiple()) {
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/* don't add null or undefined to a multiple */
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if (val !== null && val !== undefined) {
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const arr = this.get()
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if (this.state === 'default') arr.length = 0
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arr.push(def.type(val))
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this.state = state
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}
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} else {
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/* throw if already set on a singlar defaultOption */
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if (!def.isMultiple() && this.state === 'set') {
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const err = new Error(`Singular option already set [${this.definition.name}=${this.get()}]`)
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err.name = 'ALREADY_SET'
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err.value = val
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err.optionName = def.name
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throw err
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} else if (val === null || val === undefined) {
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_value.set(this, val)
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// /* required to make 'partial: defaultOption with value equal to defaultValue 2' pass */
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// if (!(def.defaultOption && !def.isMultiple())) {
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// this.state = state
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// }
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} else {
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_value.set(this, def.type(val))
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this.state = state
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}
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}
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}
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resetToDefault () {
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if (t.isDefined(this.definition.defaultValue)) {
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if (this.definition.isMultiple()) {
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_value.set(this, arrayify(this.definition.defaultValue).slice())
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} else {
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_value.set(this, this.definition.defaultValue)
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}
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} else {
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if (this.definition.isMultiple()) {
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_value.set(this, [])
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} else {
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_value.set(this, null)
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}
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}
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this.state = 'default'
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}
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static create (definition) {
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definition = new Definition(definition)
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if (definition.isBoolean()) {
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return require('./option-flag').create(definition)
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} else {
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return new this(definition)
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}
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}
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}
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module.exports = Option
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