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index.js
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index.js
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'use strict';
const strictUriEncode = require('strict-uri-encode');
const decodeComponent = require('decode-uri-component');
function encoderForArrayFormat(options) {
switch (options.arrayFormat) {
case 'index':
return (key, value, index) => {
return value === null ? [
encode(key, options),
'[',
index,
']'
].join('') : [
encode(key, options),
'[',
encode(index, options),
']=',
encode(value, options)
].join('');
};
case 'bracket':
return (key, value) => {
return value === null ? encode(key, options) : [
encode(key, options),
'[]=',
encode(value, options)
].join('');
};
default:
return (key, value) => {
return value === null ? encode(key, options) : [
encode(key, options),
'=',
encode(value, options)
].join('');
};
}
}
function parserForArrayFormat(options) {
let result;
switch (options.arrayFormat) {
case 'index':
return (key, value, accumulator) => {
result = /\[(\d*)\]$/.exec(key);
key = key.replace(/\[\d*\]$/, '');
if (!result) {
accumulator[key] = value;
return;
}
if (accumulator[key] === undefined) {
accumulator[key] = {};
}
accumulator[key][result[1]] = value;
};
case 'bracket':
return (key, value, accumulator) => {
result = /(\[\])$/.exec(key);
key = key.replace(/\[\]$/, '');
if (!result) {
accumulator[key] = value;
return;
}
if (accumulator[key] === undefined) {
accumulator[key] = [value];
return;
}
accumulator[key] = [].concat(accumulator[key], value);
};
default:
return (key, value, accumulator) => {
if (accumulator[key] === undefined) {
accumulator[key] = value;
return;
}
accumulator[key] = [].concat(accumulator[key], value);
};
}
}
function encode(value, options) {
if (options.encode) {
return options.strict ? strictUriEncode(value) : encodeURIComponent(value);
}
return value;
}
function keysSorter(input) {
if (Array.isArray(input)) {
return input.sort();
}
if (typeof input === 'object') {
return keysSorter(Object.keys(input))
.sort((a, b) => Number(a) - Number(b))
.map(key => input[key]);
}
return input;
}
function extract(input) {
const queryStart = input.indexOf('?');
if (queryStart === -1) {
return '';
}
return input.slice(queryStart + 1);
}
function parse(input, options) {
options = Object.assign({arrayFormat: 'none'}, options);
const formatter = parserForArrayFormat(options);
// Create an object with no prototype
const ret = Object.create(null);
if (typeof input !== 'string') {
return ret;
}
input = input.trim().replace(/^[?#&]/, '');
if (!input) {
return ret;
}
for (const param of input.split('&')) {
let [key, value] = param.replace(/\+/g, ' ').split('=');
// Missing `=` should be `null`:
// http://w3.org/TR/2012/WD-url-20120524/#collect-url-parameters
value = value === undefined ? null : decodeComponent(value);
formatter(decodeComponent(key), value, ret);
}
return Object.keys(ret).sort().reduce((result, key) => {
const value = ret[key];
if (Boolean(value) && typeof value === 'object' && !Array.isArray(value)) {
// Sort object keys, not values
result[key] = keysSorter(value);
} else {
result[key] = value;
}
return result;
}, Object.create(null));
}
exports.extract = extract;
exports.parse = parse;
exports.stringify = (obj, options) => {
const defaults = {
encode: true,
strict: true,
arrayFormat: 'none'
};
options = Object.assign(defaults, options);
if (options.sort === false) {
options.sort = () => {};
}
const formatter = encoderForArrayFormat(options);
return obj ? Object.keys(obj).sort(options.sort).map(key => {
const value = obj[key];
if (value === undefined) {
return '';
}
if (value === null) {
return encode(key, options);
}
if (Array.isArray(value)) {
const result = [];
for (const value2 of value.slice()) {
if (value2 === undefined) {
continue;
}
result.push(formatter(key, value2, result.length));
}
return result.join('&');
}
return encode(key, options) + '=' + encode(value, options);
}).filter(x => x.length > 0).join('&') : '';
};
exports.parseUrl = (input, options) => {
return {
url: input.split('?')[0] || '',
query: parse(extract(input), options)
};
};