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Replace textarea.value calls

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luxick
2026-05-04 11:54:58 +02:00
parent 6083a36824
commit dc79557bdb
2 changed files with 40 additions and 23 deletions
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assets/editor.js
+30 -19
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@@ -6,44 +6,55 @@
// --- DOM helpers ---
// Route every edit through execCommand so the browser's native undo/redo
// stack is preserved. Direct assignment to textarea.value would wipe it.
function replaceRange(start, end, text) {
textarea.focus();
textarea.selectionStart = start;
textarea.selectionEnd = end;
document.execCommand('insertText', false, text);
}
function wrap(before, after, placeholder) {
var start = textarea.selectionStart;
var end = textarea.selectionEnd;
var selected = textarea.value.slice(start, end) || placeholder;
var replacement = before + selected + after;
textarea.value = textarea.value.slice(0, start) + replacement + textarea.value.slice(end);
if (selected === placeholder) {
var hadSelection = end > start;
var selected = hadSelection ? textarea.value.slice(start, end) : placeholder;
replaceRange(start, end, before + selected + after);
if (!hadSelection) {
textarea.selectionStart = start + before.length;
textarea.selectionEnd = start + before.length + placeholder.length;
} else {
textarea.selectionStart = start + replacement.length;
textarea.selectionEnd = start + replacement.length;
}
textarea.focus();
}
function linePrefix(prefix) {
var start = textarea.selectionStart;
var lineStart = textarea.value.lastIndexOf('\n', start - 1) + 1;
textarea.value = textarea.value.slice(0, lineStart) + prefix + textarea.value.slice(lineStart);
replaceRange(lineStart, lineStart, prefix);
textarea.selectionStart = textarea.selectionEnd = start + prefix.length;
textarea.focus();
}
function insertAtCursor(s) {
var start = textarea.selectionStart;
var end = textarea.selectionEnd;
textarea.value = textarea.value.slice(0, start) + s + textarea.value.slice(end);
textarea.selectionStart = textarea.selectionEnd = start + s.length;
textarea.dispatchEvent(new Event('input'));
textarea.focus();
replaceRange(textarea.selectionStart, textarea.selectionEnd, s);
}
function applyResult(result) {
textarea.value = result.text;
var oldText = textarea.value;
var newText = result.text;
var prefixLen = 0;
var maxPrefix = Math.min(oldText.length, newText.length);
while (prefixLen < maxPrefix && oldText.charCodeAt(prefixLen) === newText.charCodeAt(prefixLen)) {
prefixLen++;
}
var oldEnd = oldText.length;
var newEnd = newText.length;
while (oldEnd > prefixLen && newEnd > prefixLen
&& oldText.charCodeAt(oldEnd - 1) === newText.charCodeAt(newEnd - 1)) {
oldEnd--;
newEnd--;
}
replaceRange(prefixLen, oldEnd, newText.slice(prefixLen, newEnd));
textarea.selectionStart = textarea.selectionEnd = result.cursor;
textarea.dispatchEvent(new Event('input'));
textarea.focus();
}
function applyTableOp(fn, arg) {