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'use strict';
var utils = require('./utils');
var formats = require('./formats');
var arrayPrefixGenerators = {
brackets: function brackets(prefix) {
return prefix + '[]';
},
indices: function indices(prefix, key) {
return prefix + '[' + key + ']';
},
repeat: function repeat(prefix) {
return prefix;
}
};
var toISO = Date.prototype.toISOString;
var defaults = {
delimiter: '&',
encode: true,
encoder: utils.encode,
serializeDate: function serializeDate(date) {
return toISO.call(date);
},
skipNulls: false,
strictNullHandling: false
};
var stringify = function stringify(object, prefix, generateArrayPrefix, strictNullHandling, skipNulls, encoder, filter, sort, allowDots, serializeDate, formatter) {
var obj = object;
if (typeof filter === 'function') {
obj = filter(prefix, obj);
} else if (obj instanceof Date) {
obj = serializeDate(obj);
} 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 [formatter(encoder(prefix)) + '=' + formatter(encoder(obj))];
}
return [formatter(prefix) + '=' + formatter(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,
serializeDate,
formatter
));
} else {
values = values.concat(stringify(
obj[key],
prefix + (allowDots ? '.' + key : '[' + key + ']'),
generateArrayPrefix,
strictNullHandling,
skipNulls,
encoder,
filter,
sort,
allowDots,
serializeDate,
formatter
));
}
}
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 serializeDate = typeof options.serializeDate === 'function' ? options.serializeDate : defaults.serializeDate;
if (typeof options.format === 'undefined') {
options.format = formats.default;
} else if (!Object.prototype.hasOwnProperty.call(formats.formatters, options.format)) {
throw new TypeError('Unknown format option provided.');
}
var formatter = formats.formatters[options.format];
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)) {
filter = options.filter;
objKeys = 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,
serializeDate,
formatter
));
}
return keys.join(delimiter);
};
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