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url_search_params.ts
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url_search_params.ts
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// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
import { requiredArguments } from "./util";
export class URLSearchParams {
private params: Array<[string, string]> = [];
constructor(init: string | string[][] | Record<string, string> = "") {
if (typeof init === "string") {
// Overload: USVString
// If init is a string and starts with U+003F (?),
// remove the first code point from init.
if (init.charCodeAt(0) === 0x003f) {
init = init.slice(1);
}
for (const pair of init.split("&")) {
// Empty params are ignored
if (pair.length === 0) {
continue;
}
const position = pair.indexOf("=");
const name = pair.slice(0, position === -1 ? pair.length : position);
const value = pair.slice(name.length + 1);
this.append(decodeURIComponent(name), decodeURIComponent(value));
}
} else if (Array.isArray(init)) {
// Overload: sequence<sequence<USVString>>
for (const tuple of init) {
// If pair does not contain exactly two items, then throw a TypeError.
if (tuple.length !== 2) {
const errMsg =
"Each query pair must be an iterable [name, value] tuple";
throw new TypeError(errMsg);
}
this.append(tuple[0], tuple[1]);
}
} else if (Object(init) === init) {
// Overload: record<USVString, USVString>
for (const key of Object.keys(init)) {
this.append(key, init[key]);
}
}
}
/** Appends a specified key/value pair as a new search parameter.
*
* searchParams.append('name', 'first');
* searchParams.append('name', 'second');
*/
append(name: string, value: string): void {
requiredArguments("URLSearchParams.append", arguments.length, 2);
this.params.push([String(name), value]);
}
/** Deletes the given search parameter and its associated value,
* from the list of all search parameters.
*
* searchParams.delete('name');
*/
delete(name: string): void {
requiredArguments("URLSearchParams.delete", arguments.length, 1);
name = String(name);
let i = 0;
while (i < this.params.length) {
if (this.params[i][0] === name) {
this.params.splice(i, 1);
} else {
i++;
}
}
}
/** Returns all the values associated with a given search parameter
* as an array.
*
* searchParams.getAll('name');
*/
getAll(name: string): string[] {
requiredArguments("URLSearchParams.getAll", arguments.length, 1);
name = String(name);
const values = [];
for (const entry of this.params) {
if (entry[0] === name) {
values.push(entry[1]);
}
}
return values;
}
/** Returns the first value associated to the given search parameter.
*
* searchParams.get('name');
*/
get(name: string): string | null {
requiredArguments("URLSearchParams.get", arguments.length, 1);
name = String(name);
for (const entry of this.params) {
if (entry[0] === name) {
return entry[1];
}
}
return null;
}
/** Returns a Boolean that indicates whether a parameter with the
* specified name exists.
*
* searchParams.has('name');
*/
has(name: string): boolean {
requiredArguments("URLSearchParams.has", arguments.length, 1);
name = String(name);
return this.params.some(entry => entry[0] === name);
}
/** Sets the value associated with a given search parameter to the
* given value. If there were several matching values, this method
* deletes the others. If the search parameter doesn't exist, this
* method creates it.
*
* searchParams.set('name', 'value');
*/
set(name: string, value: string): void {
requiredArguments("URLSearchParams.set", arguments.length, 2);
// If there are any name-value pairs whose name is name, in list,
// set the value of the first such name-value pair to value
// and remove the others.
name = String(name);
let found = false;
let i = 0;
while (i < this.params.length) {
if (this.params[i][0] === name) {
if (!found) {
this.params[i][1] = value;
found = true;
i++;
} else {
this.params.splice(i, 1);
}
} else {
i++;
}
}
// Otherwise, append a new name-value pair whose name is name
// and value is value, to list.
if (!found) {
this.append(name, value);
}
}
/** Sort all key/value pairs contained in this object in place and
* return undefined. The sort order is according to Unicode code
* points of the keys.
*
* searchParams.sort();
*/
sort(): void {
this.params = this.params.sort((a, b) =>
a[0] === b[0] ? 0 : a[0] > b[0] ? 1 : -1
);
}
/** Calls a function for each element contained in this object in
* place and return undefined. Optionally accepts an object to use
* as this when executing callback as second argument.
*
* searchParams.forEach((value, key, parent) => {
* console.log(value, key, parent);
* });
*
*/
forEach(
callbackfn: (value: string, key: string, parent: URLSearchParams) => void,
// eslint-disable-next-line @typescript-eslint/no-explicit-any
thisArg?: any
): void {
requiredArguments("URLSearchParams.forEach", arguments.length, 1);
if (typeof thisArg !== "undefined") {
callbackfn = callbackfn.bind(thisArg);
}
for (const [key, value] of this.entries()) {
callbackfn(value, key, this);
}
}
/** Returns an iterator allowing to go through all keys contained
* in this object.
*
* for (const key of searchParams.keys()) {
* console.log(key);
* }
*/
*keys(): Iterable<string> {
for (const entry of this.params) {
yield entry[0];
}
}
/** Returns an iterator allowing to go through all values contained
* in this object.
*
* for (const value of searchParams.values()) {
* console.log(value);
* }
*/
*values(): Iterable<string> {
for (const entry of this.params) {
yield entry[1];
}
}
/** Returns an iterator allowing to go through all key/value
* pairs contained in this object.
*
* for (const [key, value] of searchParams.entries()) {
* console.log(key, value);
* }
*/
*entries(): Iterable<[string, string]> {
yield* this.params;
}
/** Returns an iterator allowing to go through all key/value
* pairs contained in this object.
*
* for (const [key, value] of searchParams[Symbol.iterator]()) {
* console.log(key, value);
* }
*/
*[Symbol.iterator](): Iterable<[string, string]> {
yield* this.params;
}
/** Returns a query string suitable for use in a URL.
*
* searchParams.toString();
*/
toString(): string {
return this.params
.map(
tuple =>
`${encodeURIComponent(tuple[0])}=${encodeURIComponent(tuple[1])}`
)
.join("&");
}
}