add hw2

node_modules/bare-url/lib/url-search-params.js

@@ -0,0 +1,176 @@
+module.exports = class URLSearchParams {
+  static _urls = new WeakMap()
+
+  // https://url.spec.whatwg.org/#dom-urlsearchparams-urlsearchparams
+  constructor(init, url = null) {
+    this._params = new Map()
+
+    if (url) URLSearchParams._urls.set(this, url)
+
+    if (typeof init === 'string') {
+      this._parse(init)
+    } else if (init) {
+      for (const [name, value] of typeof init[Symbol.iterator] === 'function'
+        ? init
+        : Object.entries(init)) {
+        this.append(name, value)
+      }
+    }
+  }
+
+  // https://url.spec.whatwg.org/#dom-urlsearchparams-size
+  get size() {
+    return this._params.length
+  }
+
+  // https://url.spec.whatwg.org/#dom-urlsearchparams-append
+  append(name, value = null) {
+    if (value === null) return
+
+    let list = this._params.get(name)
+
+    if (list === undefined) {
+      list = []
+      this._params.set(name, list)
+    }
+
+    list.push(value)
+
+    this._update()
+  }
+
+  // https://url.spec.whatwg.org/#dom-urlsearchparams-delete
+  delete(name, value = null) {
+    if (value === null) this._params.delete(name)
+    else {
+      let list = this._params.get(name)
+
+      if (list === undefined) return
+
+      list = list.filter((found) => found !== value)
+
+      if (list.length === 0) this._params.delete(name)
+      else this._params.set(name, list)
+    }
+
+    this._update()
+  }
+
+  // https://url.spec.whatwg.org/#dom-urlsearchparams-get
+  get(name) {
+    const list = this._params.get(name)
+
+    if (list === undefined) return null
+
+    return list[0]
+  }
+
+  // https://url.spec.whatwg.org/#dom-urlsearchparams-getall
+  getAll(name) {
+    const list = this._params.get(name)
+
+    if (list === undefined) return []
+
+    return Array.from(list)
+  }
+
+  // https://url.spec.whatwg.org/#dom-urlsearchparams-has
+  has(name, value = null) {
+    const list = this._params.get(name)
+
+    if (list === undefined) return false
+
+    if (value === null) return true
+
+    return list.includes(value)
+  }
+
+  // https://url.spec.whatwg.org/#dom-urlsearchparams-set
+  set(name, value = null) {
+    if (value === null) this._params.delete(name)
+    else this._params.set(name, [value])
+
+    this._update()
+  }
+
+  toString() {
+    return this._serialize()
+  }
+
+  toJSON() {
+    return [...this]
+  }
+
+  *[Symbol.iterator]() {
+    for (const [name, values] of this._params) {
+      for (const value of values) yield [name, value]
+    }
+  }
+
+  [Symbol.for('bare.inspect')]() {
+    const object = {
+      __proto__: { constructor: URLSearchParams }
+    }
+
+    for (const [name, values] of this._params) {
+      if (values.length === 1) object[name] = values[0]
+      else object[name] = values
+    }
+
+    return object
+  }
+
+  // https://url.spec.whatwg.org/#concept-urlsearchparams-update
+  _update() {
+    const url = URLSearchParams._urls.get(this)
+
+    if (url === undefined) return
+
+    url.search = this._serialize()
+  }
+
+  // https://url.spec.whatwg.org/#concept-urlencoded-parser
+  _parse(input) {
+    if (input[0] === '?') input = input.substring(1)
+
+    this._params = new Map()
+
+    for (const sequence of input.split('&')) {
+      if (sequence.length === 0) continue
+
+      let i = sequence.indexOf('=')
+      if (i === -1) i = sequence.length
+
+      const name = decodeURIComponent(sequence.substring(0, i))
+      const value = decodeURIComponent(
+        sequence.substring(i + 1, sequence.length)
+      )
+
+      let list = this._params.get(name)
+
+      if (list === undefined) {
+        list = []
+        this._params.set(name, list)
+      }
+
+      list.push(value)
+    }
+  }
+
+  // https://url.spec.whatwg.org/#concept-urlencoded-serializer
+  _serialize() {
+    let output = ''
+
+    for (let [name, values] of this._params) {
+      name = encodeURIComponent(name)
+
+      for (const value of values) {
+        if (output) output += '&'
+
+        output += name + '=' + encodeURIComponent(value)
+      }
+    }
+
+    return output
+  }
+}