'use strict';
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const JSON5 = require('json5');
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const specialValues = {
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null: null,
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true: true,
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false: false,
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};
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function parseQuery(query) {
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if (query.substr(0, 1) !== '?') {
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throw new Error(
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"A valid query string passed to parseQuery should begin with '?'"
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);
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}
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query = query.substr(1);
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if (!query) {
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return {};
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}
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if (query.substr(0, 1) === '{' && query.substr(-1) === '}') {
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return JSON5.parse(query);
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}
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const queryArgs = query.split(/[,&]/g);
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const result = Object.create(null);
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queryArgs.forEach((arg) => {
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const idx = arg.indexOf('=');
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if (idx >= 0) {
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let name = arg.substr(0, idx);
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let value = decodeURIComponent(arg.substr(idx + 1));
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// eslint-disable-next-line no-prototype-builtins
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if (specialValues.hasOwnProperty(value)) {
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value = specialValues[value];
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}
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if (name.substr(-2) === '[]') {
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name = decodeURIComponent(name.substr(0, name.length - 2));
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if (!Array.isArray(result[name])) {
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result[name] = [];
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}
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result[name].push(value);
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} else {
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name = decodeURIComponent(name);
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result[name] = value;
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}
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} else {
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if (arg.substr(0, 1) === '-') {
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result[decodeURIComponent(arg.substr(1))] = false;
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} else if (arg.substr(0, 1) === '+') {
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result[decodeURIComponent(arg.substr(1))] = true;
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} else {
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result[decodeURIComponent(arg)] = true;
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}
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}
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});
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return result;
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}
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module.exports = parseQuery;
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