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'use strict';
var Utils = require('./utils');
var internals = {
delimiter: '&',
arrayPrefixGenerators: {
brackets: function (prefix) {
return prefix + '[]';
},
indices: function (prefix, key) {
return prefix + '[' + key + ']';
},
repeat: function (prefix) {
return prefix;
}
},
strictNullHandling: false,
skipNulls: false,
encode: true
};
internals.stringify = function (object, prefix, generateArrayPrefix, strictNullHandling, skipNulls, encode, filter, sort) {
var obj = object;
if (typeof filter === 'function') {
obj = filter(prefix, obj);
} else if (Utils.isBuffer(obj)) {
obj = String(obj);
} else if (obj instanceof Date) {
obj = obj.toISOString();
} else if (obj === null) {
if (strictNullHandling) {
return encode ? Utils.encode(prefix) : prefix;
}
obj = '';
}
if (typeof obj === 'string' || typeof obj === 'number' || typeof obj === 'boolean') {
if (encode) {
return [Utils.encode(prefix) + '=' + Utils.encode(obj)];
}
return [prefix + '=' + 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(internals.stringify(obj[key], generateArrayPrefix(prefix, key), generateArrayPrefix, strictNullHandling, skipNulls, encode, filter));
} else {
values = values.concat(internals.stringify(obj[key], prefix + '[' + key + ']', generateArrayPrefix, strictNullHandling, skipNulls, encode, filter));
}
}
return values;
};
module.exports = function (object, opts) {
var obj = object;
var options = opts || {};
var delimiter = typeof options.delimiter === 'undefined' ? internals.delimiter : options.delimiter;
var strictNullHandling = typeof options.strictNullHandling === 'boolean' ? options.strictNullHandling : internals.strictNullHandling;
var skipNulls = typeof options.skipNulls === 'boolean' ? options.skipNulls : internals.skipNulls;
var encode = typeof options.encode === 'boolean' ? options.encode : internals.encode;
var sort = typeof options.sort === 'function' ? options.sort : null;
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);
}
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(internals.stringify(obj[key], key, generateArrayPrefix, strictNullHandling, skipNulls, encode, filter, sort));
}
return keys.join(delimiter);
};
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