// package children are represented with a Map object, but many file systems
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// are case-insensitive and unicode-normalizing, so we need to treat
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// node.children.get('FOO') and node.children.get('foo') as the same thing.
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module.exports = class CIMap extends Map {
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#keys = new Map()
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constructor (items = []) {
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super()
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for (const [key, val] of items) {
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this.set(key, val)
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}
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}
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#normKey (key) {
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if (typeof key !== 'string') {
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return key
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}
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return key.normalize('NFKD').toLowerCase()
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}
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get (key) {
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const normKey = this.#normKey(key)
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return this.#keys.has(normKey) ? super.get(this.#keys.get(normKey))
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: undefined
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}
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set (key, val) {
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const normKey = this.#normKey(key)
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if (this.#keys.has(normKey)) {
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super.delete(this.#keys.get(normKey))
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}
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this.#keys.set(normKey, key)
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return super.set(key, val)
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}
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delete (key) {
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const normKey = this.#normKey(key)
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if (this.#keys.has(normKey)) {
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const prevKey = this.#keys.get(normKey)
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this.#keys.delete(normKey)
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return super.delete(prevKey)
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}
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}
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has (key) {
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const normKey = this.#normKey(key)
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return this.#keys.has(normKey) && super.has(this.#keys.get(normKey))
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}
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}
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