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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla code.
*
* The Initial Developer of the Original Code is
* Simon Bünzli <zeniko@gmail.com>
* Portions created by the Initial Developer are Copyright (C) 2006-2007
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* downloaded from http://lxr.mozilla.org/seamonkey/source/js/src/xpconnect/loader/JSON.jsm?raw=1 */
/**
* Utilities for JavaScript code to handle JSON content.
* See http://www.json.org/ for comprehensive information about JSON.
*
* Import this module through
*
* Components.utils.import("resource://gre/modules/JSON.jsm");
*
* Usage:
*
* var newJSONString = JSON.toString( GIVEN_JAVASCRIPT_OBJECT );
* var newJavaScriptObject = JSON.fromString( GIVEN_JSON_STRING );
*
* Note: For your own safety, Objects/Arrays returned by
* JSON.fromString aren't instanceof Object/Array.
*/
// The following code is a loose adaption of Douglas Crockford's code
// from http://www.json.org/json.js (public domain'd)
// Notable differences:
// * Unserializable values such as |undefined| or functions aren't
// silently dropped but always lead to a TypeError.
// * An optional key blacklist has been added to JSON.toString
sqlime.JSON = {
/**
* Converts a JavaScript object into a JSON string.
*
* @param aJSObject is the object to be converted
* @param aKeysToDrop is an optional array of keys which will be
* ignored in all objects during the serialization
* @return the object's JSON representation
*
* Note: aJSObject MUST not contain cyclic references.
*/
toString: function JSON_toString(aJSObject, aKeysToDrop) {
// these characters have a special escape notation
const charMap = { "\b": "\\b", "\t": "\\t", "\n": "\\n", "\f": "\\f",
"\r": "\\r", '"': '\\"', "\\": "\\\\" };
// we use a single string builder for efficiency reasons
var pieces = [];
// this recursive function walks through all objects and appends their
// JSON representation (in one or several pieces) to the string builder
function append_piece(aObj) {
if (typeof aObj == "boolean") {
pieces.push(aObj ? "true" : "false");
}
else if (typeof aObj == "number" && isFinite(aObj)) {
// there is no representation for infinite numbers or for NaN!
pieces.push(aObj.toString());
}
else if (typeof aObj == "string") {
aObj = aObj.replace(/[\\"\x00-\x1F\u0080-\uFFFF]/g, function($0) {
// use the special escape notation if one exists, otherwise
// produce a general unicode escape sequence
return charMap[$0] ||
"\\u" + ("0000" + $0.charCodeAt(0).toString(16)).slice(-4);
});
pieces.push('"' + aObj + '"')
}
else if (aObj === null) {
pieces.push("null");
}
// if it looks like an array, treat it as such - this is required
// for all arrays from either outside this module or a sandbox
else if (aObj instanceof Array ||
typeof aObj == "object" && "length" in aObj &&
(aObj.length === 0 || aObj[aObj.length - 1] !== undefined)) {
pieces.push("[");
for (var i = 0; i < aObj.length; i++) {
append_piece(aObj[i]);
pieces.push(",");
}
if (pieces[pieces.length - 1] == ",")
pieces.pop(); // drop the trailing colon
pieces.push("]");
}
else if (typeof aObj == "object") {
pieces.push("{");
for (var key in aObj) {
// allow callers to pass objects containing private data which
// they don't want the JSON string to contain (so they don't
// have to manually pre-process the object)
if (aKeysToDrop && aKeysToDrop.indexOf(key) != -1)
continue;
append_piece(key.toString());
pieces.push(":");
append_piece(aObj[key]);
pieces.push(",");
}
if (pieces[pieces.length - 1] == ",")
pieces.pop(); // drop the trailing colon
pieces.push("}");
}
else {
throw new TypeError("No JSON representation for this object!");
}
}
append_piece(aJSObject);
return pieces.join("");
},
/**
* Converts a JSON string into a JavaScript object.
*
* @param aJSONString is the string to be converted
* @return a JavaScript object for the given JSON representation
*/
fromString: function JSON_fromString(aJSONString) {
if (!this.isMostlyHarmless(aJSONString))
throw new SyntaxError("No valid JSON string!");
var s = new Components.utils.Sandbox("about:blank");
return Components.utils.evalInSandbox("(" + aJSONString + ")", s);
},
/**
* Checks whether the given string contains potentially harmful
* content which might be executed during its evaluation
* (no parser, thus not 100% safe! Best to use a Sandbox for evaluation)
*
* @param aString is the string to be tested
* @return a boolean
*/
isMostlyHarmless: function JSON_isMostlyHarmless(aString) {
const maybeHarmful = /[^,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]/;
const jsonStrings = /"(\\.|[^"\\\n\r])*"/g;
return !maybeHarmful.test(aString.replace(jsonStrings, ""));
}
};