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