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