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/* Copyright 2015 Mark Haines
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
var escaped = /[\\\"\x00-\x1F]/g;
var escapes = {};
for (var i = 0; i < 0x20; ++i) {
escapes[String.fromCharCode(i)] = (
'\\U' + ('0000' + i.toString(16)).slice(-4).toUpperCase()
);
}
escapes['\b'] = '\\b';
escapes['\t'] = '\\t';
escapes['\n'] = '\\n';
escapes['\f'] = '\\f';
escapes['\r'] = '\\r';
escapes['\"'] = '\\\"';
escapes['\\'] = '\\\\';
function escapeString(value) {
escaped.lastIndex = 0;
return value.replace(escaped, function(c) { return escapes[c]; });
}
function stringify(value) {
switch (typeof value) {
case 'string':
return '"' + escapeString(value) + '"';
case 'number':
return isFinite(value) ? value : 'null';
case 'boolean':
return value;
case 'object':
if (value === null) {
return 'null';
}
if (Array.isArray(value)) {
return stringifyArray(value);
}
return stringifyObject(value);
default:
throw new Error('Cannot stringify: ' + typeof value);
}
}
function stringifyArray(array) {
var sep = '[';
var result = '';
for (var i = 0; i < array.length; ++i) {
result += sep;
sep = ',';
result += stringify(array[i]);
}
if (sep != ',') {
return '[]';
} else {
return result + ']';
}
}
function stringifyObject(object) {
var sep = '{';
var result = '';
var keys = Object.keys(object);
keys.sort();
for (var i = 0; i < keys.length; ++i) {
var key = keys[i];
result += sep + '"' + escapeString(key) + '":';
sep = ',';
result += stringify(object[key]);
}
if (sep != ',') {
return '{}';
} else {
return result + '}';
}
}
/** */
module.exports = {stringify: stringify};
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