flip order

glue/crumble/README.md

@@ -120,6 +120,7 @@ button (now labelled "Hide Import/Export") again.
 - `ctrl+v`: Past clipboard contents at current selection (or entire layer if nothing selected).
 - `ctrl+x`: Cut selection to clipboard (or entire layer if nothing selected).
 - `f`: Flip qubit order of selected operations (e.g. flip the control-to-target direction of a CNOT).
+- `shift+f`: Flip order of all circuit layers, starting from the current layer until the next empty layer.
 - `home`: Jump to the first layer of the circuit.
 - `end`: Jump to the last layer of the circuit.
 - `t`: Rotate circuit 45 degrees clockwise.

glue/crumble/main.js

@@ -255,6 +255,22 @@ function makeChordHandlers() {
         }
         editorState.commit_or_preview(newCircuit, preview);
     });
+    res.set('shift+f', preview => {
+        let newCircuit = editorState.copyOfCurCircuit();
+        let end = editorState.curLayer;
+        while (end < newCircuit.layers.length && !newCircuit.layers[end].empty()) {
+            end += 1;
+        }
+        let layers = [];
+        for (let k = editorState.curLayer; k < end; k++) {
+            layers.push(newCircuit.layers[k]);
+        }
+        layers.reverse();
+        for (let k = editorState.curLayer; k < end; k++) {
+            newCircuit.layers[k] = layers[k - editorState.curLayer];
+        }
+        editorState.commit_or_preview(newCircuit, preview);
+    });
     res.set('shift+>', preview => editorState.applyCoordinateTransform((x, y) => [x + 1, y], preview));
     res.set('shift+<', preview => editorState.applyCoordinateTransform((x, y) => [x - 1, y], preview));
     res.set('shift+v', preview => editorState.applyCoordinateTransform((x, y) => [x, y + 1], preview));