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// Load modules
var Utils = require('./utils');
// Declare internals
var internals = {
delimiter: '&',
arrayPrefixGenerators: {
brackets: function (prefix, key) {
return prefix + '[]';
},
indices: function (prefix, key) {
return prefix + '[' + key + ']';
},
repeat: function (prefix, key) {
return prefix;
}
},
strictNullHandling: false
};
internals.stringify = function (obj, prefix, generateArrayPrefix, strictNullHandling, filter) {
if (typeof filter === 'function') {
obj = filter(prefix, obj);
}
else if (Utils.isBuffer(obj)) {
obj = obj.toString();
}
else if (obj instanceof Date) {
obj = obj.toISOString();
}
else if (obj === null) {
if (strictNullHandling) {
return Utils.encode(prefix);
}
obj = '';
}
if (typeof obj === 'string' ||
typeof obj === 'number' ||
typeof obj === 'boolean') {
return [Utils.encode(prefix) + '=' + Utils.encode(obj)];
}
var values = [];
if (typeof obj === 'undefined') {
return values;
}
var objKeys = Array.isArray(filter) ? filter : Object.keys(obj);
for (var i = 0, il = objKeys.length; i < il; ++i) {
var key = objKeys[i];
if (Array.isArray(obj)) {
values = values.concat(internals.stringify(obj[key], generateArrayPrefix(prefix, key), generateArrayPrefix, strictNullHandling, filter));
}
else {
values = values.concat(internals.stringify(obj[key], prefix + '[' + key + ']', generateArrayPrefix, strictNullHandling, filter));
}
}
return values;
};
module.exports = function (obj, options) {
options = options || {};
var delimiter = typeof options.delimiter === 'undefined' ? internals.delimiter : options.delimiter;
var strictNullHandling = typeof options.strictNullHandling === 'boolean' ? options.strictNullHandling : internals.strictNullHandling;
var objKeys;
var filter;
if (typeof options.filter === 'function') {
filter = options.filter;
obj = filter('', obj);
}
else if (Array.isArray(options.filter)) {
objKeys = filter = options.filter;
}
var keys = [];
if (typeof obj !== 'object' ||
obj === null) {
return '';
}
var arrayFormat;
if (options.arrayFormat in internals.arrayPrefixGenerators) {
arrayFormat = options.arrayFormat;
}
else if ('indices' in options) {
arrayFormat = options.indices ? 'indices' : 'repeat';
}
else {
arrayFormat = 'indices';
}
var generateArrayPrefix = internals.arrayPrefixGenerators[arrayFormat];
if (!objKeys) {
objKeys = Object.keys(obj);
}
for (var i = 0, il = objKeys.length; i < il; ++i) {
var key = objKeys[i];
keys = keys.concat(internals.stringify(obj[key], key, generateArrayPrefix, strictNullHandling, filter));
}
return keys.join(delimiter);
};
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