1 files changed, 82 insertions, 0 deletions
diff --git a/Source/WebCore/Scripts/DumpEditingHistory.js b/Source/WebCore/Scripts/DumpEditingHistory.js
new file mode 100644
index 000000000..16b1d81b2
--- /dev/null
+++ b/Source/WebCore/Scripts/DumpEditingHistory.js
@@ -0,0 +1,82 @@
+(() => {
+    let initialized = false;
+    let globalNodeMap = new EditingHistory.GlobalNodeMap();
+    let topLevelUpdates = [];
+    let currentChildUpdates = [];
+    let isProcessingTopLevelUpdate = false;
+    let lastKnownSelectionState = null;
+    let mutationObserver = new MutationObserver(records => appendDOMUpdatesFromRecords(records));
+
+    function beginProcessingTopLevelUpdate() {
+        isProcessingTopLevelUpdate = true;
+    }
+
+    function endProcessingTopLevelUpdate(topLevelUpdate) {
+        topLevelUpdates.push(topLevelUpdate);
+        currentChildUpdates = [];
+        isProcessingTopLevelUpdate = false;
+    }
+
+    function appendDOMUpdatesFromRecords(records) {
+        if (!records.length)
+            return;
+
+        let newUpdates = EditingHistory.DOMUpdate.fromRecords(records, globalNodeMap);
+        if (isProcessingTopLevelUpdate)
+            currentChildUpdates = currentChildUpdates.concat(newUpdates);
+        else
+            topLevelUpdates = topLevelUpdates.concat(newUpdates);
+    }
+
+    function appendSelectionUpdateIfNecessary() {
+        let newSelectionState = EditingHistory.SelectionState.fromSelection(getSelection(), globalNodeMap);
+        if (newSelectionState.isEqual(lastKnownSelectionState))
+            return;
+
+        let update = new EditingHistory.SelectionUpdate(globalNodeMap, newSelectionState);
+        if (isProcessingTopLevelUpdate)
+            currentChildUpdates.push(update);
+        else
+            topLevelUpdates.push(update);
+        lastKnownSelectionState = newSelectionState;
+    }
+
+    document.body.addEventListener("focus", () => {
+        if (initialized)
+            return;
+
+        initialized = true;
+
+        EditingHistory.getEditingHistoryAsJSONString = (formatted) => {
+            let record = {};
+            record.updates = topLevelUpdates.map(update => update.toObject());
+            record.globalNodeMap = globalNodeMap.toObject();
+            return formatted ? JSON.stringify(record, null, 4) : JSON.stringify(record);
+        };
+
+        document.addEventListener("selectionchange", () => {
+            appendSelectionUpdateIfNecessary();
+        });
+
+        document.addEventListener("beforeinput", event => {
+            appendDOMUpdatesFromRecords(mutationObserver.takeRecords());
+            beginProcessingTopLevelUpdate();
+        });
+
+        document.addEventListener("input", event => {
+            appendDOMUpdatesFromRecords(mutationObserver.takeRecords());
+            let eventData = event.dataTransfer ? event.dataTransfer.getData("text/html") : event.data;
+            lastKnownSelectionState = null;
+            endProcessingTopLevelUpdate(new EditingHistory.InputEventUpdate(globalNodeMap, currentChildUpdates, event.inputType, eventData, event.timeStamp));
+        });
+
+        mutationObserver.observe(document, {
+            childList: true,
+            attributes: true,
+            characterData: true,
+            subtree: true,
+            attributeOldValue: true,
+            characterDataOldValue: true,
+        });
+    });
+})();