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'use strict';
var utils = require('./utils');
var has = Object.prototype.hasOwnProperty;
var defaults = {
allowDots: false,
allowPrototypes: false,
arrayLimit: 20,
decoder: utils.decode,
delimiter: '&',
depth: 5,
parameterLimit: 1000,
plainObjects: false,
strictNullHandling: false
};
var parseValues = function parseQueryStringValues(str, options) {
var obj = {};
var parts = str.split(options.delimiter, options.parameterLimit === Infinity ? undefined : options.parameterLimit);
for (var i = 0; i < parts.length; ++i) {
var part = parts[i];
var pos = part.indexOf(']=') === -1 ? part.indexOf('=') : part.indexOf(']=') + 1;
var key, val;
if (pos === -1) {
key = options.decoder(part);
val = options.strictNullHandling ? null : '';
} else {
key = options.decoder(part.slice(0, pos));
val = options.decoder(part.slice(pos + 1));
}
if (has.call(obj, key)) {
obj[key] = [].concat(obj[key]).concat(val);
} else {
obj[key] = val;
}
}
return obj;
};
var parseObject = function parseObjectRecursive(chain, val, options) {
if (!chain.length) {
return val;
}
var root = chain.shift();
var obj;
if (root === '[]') {
obj = [];
obj = obj.concat(parseObject(chain, val, options));
} else {
obj = options.plainObjects ? Object.create(null) : {};
var cleanRoot = root.charAt(0) === '[' && root.charAt(root.length - 1) === ']' ? root.slice(1, -1) : root;
var index = parseInt(cleanRoot, 10);
if (
!isNaN(index) &&
root !== cleanRoot &&
String(index) === cleanRoot &&
index >= 0 &&
(options.parseArrays && index <= options.arrayLimit)
) {
obj = [];
obj[index] = parseObject(chain, val, options);
} else {
obj[cleanRoot] = parseObject(chain, val, options);
}
}
return obj;
};
var parseKeys = function parseQueryStringKeys(givenKey, val, options) {
if (!givenKey) {
return;
}
// Transform dot notation to bracket notation
var key = options.allowDots ? givenKey.replace(/\.([^.[]+)/g, '[$1]') : givenKey;
// The regex chunks
var brackets = /(\[[^[\]]*])/;
var child = /(\[[^[\]]*])/g;
// Get the parent
var segment = brackets.exec(key);
var parent = segment ? key.slice(0, segment.index) : key;
// Stash the parent if it exists
var keys = [];
if (parent) {
// If we aren't using plain objects, optionally prefix keys
// that would overwrite object prototype properties
if (!options.plainObjects && has.call(Object.prototype, parent)) {
if (!options.allowPrototypes) {
return;
}
}
keys.push(parent);
}
// Loop through children appending to the array until we hit depth
var i = 0;
while ((segment = child.exec(key)) !== null && i < options.depth) {
i += 1;
if (!options.plainObjects && has.call(Object.prototype, segment[1].slice(1, -1))) {
if (!options.allowPrototypes) {
return;
}
}
keys.push(segment[1]);
}
// If there's a remainder, just add whatever is left
if (segment) {
keys.push('[' + key.slice(segment.index) + ']');
}
return parseObject(keys, val, options);
};
module.exports = function (str, opts) {
var options = opts || {};
if (options.decoder !== null && options.decoder !== undefined && typeof options.decoder !== 'function') {
throw new TypeError('Decoder has to be a function.');
}
options.delimiter = typeof options.delimiter === 'string' || utils.isRegExp(options.delimiter) ? options.delimiter : defaults.delimiter;
options.depth = typeof options.depth === 'number' ? options.depth : defaults.depth;
options.arrayLimit = typeof options.arrayLimit === 'number' ? options.arrayLimit : defaults.arrayLimit;
options.parseArrays = options.parseArrays !== false;
options.decoder = typeof options.decoder === 'function' ? options.decoder : defaults.decoder;
options.allowDots = typeof options.allowDots === 'boolean' ? options.allowDots : defaults.allowDots;
options.plainObjects = typeof options.plainObjects === 'boolean' ? options.plainObjects : defaults.plainObjects;
options.allowPrototypes = typeof options.allowPrototypes === 'boolean' ? options.allowPrototypes : defaults.allowPrototypes;
options.parameterLimit = typeof options.parameterLimit === 'number' ? options.parameterLimit : defaults.parameterLimit;
options.strictNullHandling = typeof options.strictNullHandling === 'boolean' ? options.strictNullHandling : defaults.strictNullHandling;
if (str === '' || str === null || typeof str === 'undefined') {
return options.plainObjects ? Object.create(null) : {};
}
var tempObj = typeof str === 'string' ? parseValues(str, options) : str;
var obj = options.plainObjects ? Object.create(null) : {};
// Iterate over the keys and setup the new object
var keys = Object.keys(tempObj);
for (var i = 0; i < keys.length; ++i) {
var key = keys[i];
var newObj = parseKeys(key, tempObj[key], options);
obj = utils.merge(obj, newObj, options);
}
return utils.compact(obj);
};
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