joshleaves · April 3, 2013 10:24 · Apr 3, 2013
diff --git a/js-6901.js b/js-6901.js
@@ -0,0 +1,58 @@
+/*
+// Will only throw on missing leading '/'
+*/
+JSON.pointer = function (object, pointer) {
+ if ('undefined' === typeof object || 'undefined' === typeof pointer || '/' === pointer) {
+ return object;
+ }
+ if ('/' !== pointer.substr(0, 1)) {
+ throw new SyntaxError('Unexpected character ' + pointer.substr(0, 1));
+ }
+ var _path = pointer.substr(1).split('/').map(function (p, idx) {
+ if (/^[0-9]$/.test(p)) {
+ return parseInt(p);
+ }
+ return p.replace('~1', '/').replace('~0', '~');
+ });
+
+ var _object = object;
+ while (_path.length) {
+ _object = _object[_path.shift()];
+ if ('undefined' === typeof _object) return _object;
+ }
+ return _object;
+};
+/*
+// Extending native objects prototypes is bâaad, m'kay?
+*/
+Object.prototype.pointer = function (pointer) {
+ return JSON.pointer(this, pointer);
+}
+
+
+/*
+// Quick test value. Complex enough?
+*/
+var a = { foo: { bar: [ { hello: { world: true } } ] } };
+
+/*
+// Let's trigger an error!
+*/
+try {
+ // Invalid: Missing leading '/'
+ console.log(a.pointer('foo'));
+} catch (e) {
+ // [SyntaxError: Unexpected character f]
+ console.log(e);
+}
+
+/*
+// Now for some real use!
+*/
+console.log(a.pointer());
+console.log(a.pointer('/'));
+console.log(a.pointer('/foo'));
+console.log(a.pointer('/foo/bar'));
+console.log(a.pointer('/foo/bar/0'));
+console.log(a.pointer('/foo/bar/0/hello'));
+console.log(a.pointer('/foo/bar/0/hello/world'));