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denoland-deno/std/node/querystring.ts

72 lines
1.7 KiB
TypeScript

// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
interface ParseOptions {
decodeURIComponent?: (string: string) => string;
maxKeys?: number;
}
export function parse(
str: string,
sep = "&",
eq = "=",
{ decodeURIComponent = unescape, maxKeys = 1000 }: ParseOptions = {}
): { [key: string]: string[] | string } {
const entries = str
.split(sep)
.map((entry) => entry.split(eq).map(decodeURIComponent));
const final: { [key: string]: string[] | string } = {};
let i = 0;
while (true) {
if ((Object.keys(final).length === maxKeys && !!maxKeys) || !entries[i]) {
break;
}
const [key, val] = entries[i];
if (final[key]) {
if (Array.isArray(final[key])) {
(final[key] as string[]).push(val);
} else {
final[key] = [final[key] as string, val];
}
} else {
final[key] = val;
}
i++;
}
return final;
}
interface StringifyOptions {
encodeURIComponent?: (string: string) => string;
}
export function stringify(
obj: object,
sep = "&",
eq = "=",
{ encodeURIComponent = escape }: StringifyOptions = {}
): string {
const final = [];
for (const entry of Object.entries(obj)) {
if (Array.isArray(entry[1])) {
for (const val of entry[1]) {
final.push(encodeURIComponent(entry[0]) + eq + encodeURIComponent(val));
}
} else if (typeof entry[1] !== "object" && entry[1] !== undefined) {
final.push(entry.map(encodeURIComponent).join(eq));
} else {
final.push(encodeURIComponent(entry[0]) + eq);
}
}
return final.join(sep);
}
export const decode = parse;
export const encode = stringify;
export const unescape = decodeURIComponent;
export const escape = encodeURIComponent;