From 7b5eb196dbf4248eb6c67af2843cacb28863ce2f Mon Sep 17 00:00:00 2001
From: EllangoK <karun.ellango7@gmail.com>
Date: Mon, 17 Apr 2023 17:29:22 -0400
Subject: [PATCH] allows control arrow to edit attention in textarea

---
 web/extensions/core/editAttention.js | 117 +++++++++++++++++++++++++++
 1 file changed, 117 insertions(+)
 create mode 100644 web/extensions/core/editAttention.js

diff --git a/web/extensions/core/editAttention.js b/web/extensions/core/editAttention.js
new file mode 100644
index 00000000..d943290c
--- /dev/null
+++ b/web/extensions/core/editAttention.js
@@ -0,0 +1,117 @@
+import { app } from "/scripts/app.js";
+
+// Allows you to edit the attention weight by holding ctrl (or cmd) and using the up/down arrow keys
+
+const id = "Comfy.EditAttention";
+app.registerExtension({
+name:id,
+    init() {
+        function incrementWeight(weight, delta) {
+            const floatWeight = parseFloat(weight);
+            if (isNaN(floatWeight)) return weight;
+            const newWeight = floatWeight + delta;
+            if (newWeight < 0) return "0";
+            return String(Number(newWeight.toFixed(10)));
+        }
+
+        function findNearestEnclosure(text, cursorPos) {
+            let start = cursorPos, end = cursorPos;
+            let openCount = 0, closeCount = 0;
+
+            // Find opening parenthesis before cursor
+            while (start >= 0) {
+                start--;
+                if (text[start] === "(" && openCount === closeCount) break;
+                if (text[start] === "(") openCount++;
+                if (text[start] === ")") closeCount++;
+            }
+            if (start < 0) return false;
+
+            openCount = 0;
+            closeCount = 0;
+
+            // Find closing parenthesis after cursor
+            while (end < text.length) {
+                if (text[end] === ")" && openCount === closeCount) break;
+                if (text[end] === "(") openCount++;
+                if (text[end] === ")") closeCount++;
+                end++;
+            }
+            if (end === text.length) return false;
+
+            return { start: start + 1, end: end };
+        }
+
+        function addWeightToParentheses(text) {
+            const parenRegex = /^\((.*)\)$/;
+            const parenMatch = text.match(parenRegex);
+
+            const floatRegex = /:([+-]?(\d*\.)?\d+([eE][+-]?\d+)?)/;
+            const floatMatch = text.match(floatRegex);
+
+            if (parenMatch && !floatMatch) {
+                return `(${parenMatch[1]}:1.0)`;
+            } else {
+                return text;
+            }
+        };
+
+        function editAttention(event) {
+            const inputField = event.composedPath()[0];
+            const delta = 0.1;
+
+            if (inputField.tagName !== "TEXTAREA") return;
+            if (!(event.key === "ArrowUp" || event.key === "ArrowDown")) return;
+            if (!event.ctrlKey && !event.metaKey) return;
+
+            event.preventDefault();
+
+            let start = inputField.selectionStart;
+            let end = inputField.selectionEnd;
+            let selectedText = inputField.value.substring(start, end);
+
+            // If there is no selection, attempt to find the nearest enclosure
+            if (!selectedText) {
+                const nearestEnclosure = findNearestEnclosure(inputField.value, start);
+                if (nearestEnclosure) {
+                    start = nearestEnclosure.start;
+                    end = nearestEnclosure.end;
+                    selectedText = inputField.value.substring(start, end);
+                } else {
+                    return;
+                }
+            }
+
+            // If the selection ends with a space, remove it
+            if (selectedText[selectedText.length - 1] === " ") {
+                selectedText = selectedText.substring(0, selectedText.length - 1);
+                end -= 1;
+            }
+
+            // If there are parentheses left and right of the selection, select them
+            if (inputField.value[start - 1] === "(" && inputField.value[end] === ")") {
+                start -= 1;
+                end += 1;
+                selectedText = inputField.value.substring(start, end);
+            }
+
+            // If the selection is not enclosed in parentheses, add them
+            if (selectedText[0] !== "(" || selectedText[selectedText.length - 1] !== ")") {
+                console.log("adding parentheses", inputField.value[start], inputField.value[end], selectedText);
+                selectedText = `(${selectedText})`;
+            }
+
+            // If the selection does not have a weight, add a weight of 1.0
+            selectedText = addWeightToParentheses(selectedText);
+
+            // Increment the weight
+            const weightDelta = event.key === "ArrowUp" ? delta : -delta;
+            const updatedText = selectedText.replace(/(.*:)(\d+(\.\d+)?)(.*)/, (match, prefix, weight, _, suffix) => {
+              return prefix + incrementWeight(weight, weightDelta) + suffix;
+            });
+
+            inputField.setRangeText(updatedText, start, end, "select");
+        }
+        window.addEventListener("keydown", editAttention);
+    },
+});