mv element.io @types __mocks__/ debian docker module_system/ playwright res src test webapp Dockerfile .dockerignore .eslintignore .stylelintrc.cjs babel.config.cjs recorder-worklet-loader.cjs .modernizr.json components.json config.json config.sample.json package.json project.json tsconfig.json tsconfig.module_system.json jest.config.ts playwright.config.ts webpack.config.ts build_config.sample.yaml apps/web/

mkdir apps/web/scripts mv scripts/{cleanup.sh,ci_package.sh,copy-res.ts,deploy.py,package.sh} apps/web/scripts And a couple of gitignore tweaks Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>
2026-02-24 15:43:58 +00:00
parent e7509c92a1
commit 91a3cb03c1
3408 changed files with 28 additions and 32 deletions
@@ -0,0 +1,67 @@
+/*
+Copyright 2019-2024 New Vector Ltd.
+Copyright 2019 The Matrix.org Foundation C.I.C.
+
+SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE files in the repository root for full details.
+*/
+
+export interface IDiff {
+    removed?: string;
+    added?: string;
+    at?: number;
+}
+
+function firstDiff(a: string, b: string): number {
+    const compareLen = Math.min(a.length, b.length);
+    for (let i = 0; i < compareLen; ++i) {
+        if (a[i] !== b[i]) {
+            return i;
+        }
+    }
+    return compareLen;
+}
+
+function diffStringsAtEnd(oldStr: string, newStr: string): IDiff {
+    const len = Math.min(oldStr.length, newStr.length);
+    const startInCommon = oldStr.slice(0, len) === newStr.slice(0, len);
+    if (startInCommon && oldStr.length > newStr.length) {
+        return { removed: oldStr.slice(len), at: len };
+    } else if (startInCommon && oldStr.length < newStr.length) {
+        return { added: newStr.slice(len), at: len };
+    } else {
+        const commonStartLen = firstDiff(oldStr, newStr);
+        return {
+            removed: oldStr.slice(commonStartLen),
+            added: newStr.slice(commonStartLen),
+            at: commonStartLen,
+        };
+    }
+}
+
+// assumes only characters have been deleted at one location in the string, and none added
+export function diffDeletion(oldStr: string, newStr: string): IDiff {
+    if (oldStr === newStr) {
+        return {};
+    }
+    const firstDiffIdx = firstDiff(oldStr, newStr);
+    const amount = oldStr.length - newStr.length;
+    return { at: firstDiffIdx, removed: oldStr.slice(firstDiffIdx, firstDiffIdx + amount) };
+}
+
+/**
+ * Calculates which string was added and removed around the caret position
+ * @param {String} oldValue the previous value
+ * @param {String} newValue the new value
+ * @param {Number} caretPosition the position of the caret after `newValue` was applied.
+ * @return {object} an object with `at` as the offset where characters were removed and/or added,
+ *                  `added` with the added string (if any), and
+ *                  `removed` with the removed string (if any)
+ */
+export function diffAtCaret(oldValue: string, newValue: string, caretPosition: number): IDiff {
+    const diffLen = newValue.length - oldValue.length;
+    const caretPositionBeforeInput = caretPosition - diffLen;
+    const oldValueBeforeCaret = oldValue.substring(0, caretPositionBeforeInput);
+    const newValueBeforeCaret = newValue.substring(0, caretPosition);
+    return diffStringsAtEnd(oldValueBeforeCaret, newValueBeforeCaret);
+}