1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
 
 
1
 
1
 
 
 
 
 
 
 
 
 
 
 
1
 
 
 
 
 
 
 
1
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
'use strict';
 
var Utils = require('./utils');
 
var arrayPrefixGenerators = {
    brackets: function brackets(prefix) {
        return prefix + '[]';
    },
    indices: function indices(prefix, key) {
        return prefix + '[' + key + ']';
    },
    repeat: function repeat(prefix) {
        return prefix;
    }
};
 
var defaults = {
    delimiter: '&',
    strictNullHandling: false,
    skipNulls: false,
    encode: true,
    encoder: Utils.encode
};
 
var stringify = function stringify(object, prefix, generateArrayPrefix, strictNullHandling, skipNulls, encoder, filter, sort, allowDots) {
    var obj = object;
    if (typeof filter === 'function') {
        obj = filter(prefix, obj);
    } else if (obj instanceof Date) {
        obj = obj.toISOString();
    } else if (obj === null) {
        if (strictNullHandling) {
            return encoder ? encoder(prefix) : prefix;
        }
 
        obj = '';
    }
 
    if (typeof obj === 'string' || typeof obj === 'number' || typeof obj === 'boolean' || Utils.isBuffer(obj)) {
        if (encoder) {
            return [encoder(prefix) + '=' + encoder(obj)];
        }
        return [prefix + '=' + String(obj)];
    }
 
    var values = [];
 
    if (typeof obj === 'undefined') {
        return values;
    }
 
    var objKeys;
    if (Array.isArray(filter)) {
        objKeys = filter;
    } else {
        var keys = Object.keys(obj);
        objKeys = sort ? keys.sort(sort) : keys;
    }
 
    for (var i = 0; i < objKeys.length; ++i) {
        var key = objKeys[i];
 
        if (skipNulls && obj[key] === null) {
            continue;
        }
 
        if (Array.isArray(obj)) {
            values = values.concat(stringify(obj[key], generateArrayPrefix(prefix, key), generateArrayPrefix, strictNullHandling, skipNulls, encoder, filter, sort, allowDots));
        } else {
            values = values.concat(stringify(obj[key], prefix + (allowDots ? '.' + key : '[' + key + ']'), generateArrayPrefix, strictNullHandling, skipNulls, encoder, filter, sort, allowDots));
        }
    }
 
    return values;
};
 
module.exports = function (object, opts) {
    var obj = object;
    var options = opts || {};
    var delimiter = typeof options.delimiter === 'undefined' ? defaults.delimiter : options.delimiter;
    var strictNullHandling = typeof options.strictNullHandling === 'boolean' ? options.strictNullHandling : defaults.strictNullHandling;
    var skipNulls = typeof options.skipNulls === 'boolean' ? options.skipNulls : defaults.skipNulls;
    var encode = typeof options.encode === 'boolean' ? options.encode : defaults.encode;
    var encoder = encode ? (typeof options.encoder === 'function' ? options.encoder : defaults.encoder) : null;
    var sort = typeof options.sort === 'function' ? options.sort : null;
    var allowDots = typeof options.allowDots === 'undefined' ? false : options.allowDots;
    var objKeys;
    var filter;
 
    if (options.encoder !== null && options.encoder !== undefined && typeof options.encoder !== 'function') {
        throw new TypeError('Encoder has to be a function.');
    }
 
    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 arrayPrefixGenerators) {
        arrayFormat = options.arrayFormat;
    } else if ('indices' in options) {
        arrayFormat = options.indices ? 'indices' : 'repeat';
    } else {
        arrayFormat = 'indices';
    }
 
    var generateArrayPrefix = arrayPrefixGenerators[arrayFormat];
 
    if (!objKeys) {
        objKeys = Object.keys(obj);
    }
 
    if (sort) {
        objKeys.sort(sort);
    }
 
    for (var i = 0; i < objKeys.length; ++i) {
        var key = objKeys[i];
 
        if (skipNulls && obj[key] === null) {
            continue;
        }
 
        keys = keys.concat(stringify(obj[key], key, generateArrayPrefix, strictNullHandling, skipNulls, encoder, filter, sort, allowDots));
    }
 
    return keys.join(delimiter);
};