skeleton for decorator-based schema validation

1 files changed, 87 insertions, 0 deletions

diff --git a/extension/background/checkable.ts b/extension/background/checkable.ts
new file mode 100644
index 000000000..63fbd3646
--- /dev/null
+++ b/extension/background/checkable.ts
@@ -0,0 +1,87 @@
+/*
+ This file is part of TALER
+ (C) 2016 GNUnet e.V.
+
+ TALER is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ TALER; see the file COPYING.  If not, If not, see <http://www.gnu.org/licenses/>
+ */
+
+"use strict";
+
+/**
+ * Decorators for type-checking JSON into
+ * an object.
+ * @module Checkable
+ * @author Florian Dold
+ */
+
+
+namespace Checkable {
+  let chkSym = Symbol("checkable");
+
+  function checkNumber(target, prop) {
+    return true;
+  }
+
+  function checkString(target, prop) {
+    return true;
+  }
+
+  export function Class(target) {
+    target.checked = (v) => {
+      let props = target.prototype[chkSym].props;
+      console.log("hello, world");
+      let remainingPropNames = new Set(Object.getOwnPropertyNames(v));
+
+      for (let prop of props) {
+        remainingPropNames.delete(prop);
+        console.log("prop", prop);
+      }
+
+      if (remainingPropNames.size != 0) {
+        throw Error("superfluous properties " + JSON.stringify(remainingPropNames.values()));
+      }
+    };
+    return target;
+  }
+
+  export function Value(type) {
+    function deco(target) {
+    }
+
+    return deco;
+  }
+
+  export function List(type) {
+    function deco(target) {
+    }
+
+    return deco;
+  }
+
+  export function Number(target: Object, propertyKey: string | symbol): void {
+    let chk = target[chkSym];
+    if (!chk) {
+      chk = {props: []};
+      target[chkSym] = chk;
+    }
+    chk.props.push({propertyKey: propertyKey, checker: checkNumber});
+  }
+
+  export function String(target: Object, propertyKey: string | symbol): void {
+    let chk = target[chkSym];
+    if (!chk) {
+      chk = {props: []};
+      target[chkSym] = chk;
+    }
+    chk.props.push({propertyKey: propertyKey, checker: checkString});
+  }
+}