snapshot of https://github.com/go-gitea/gitea.git (main, 2026-09-15; blobs > 131072B omitted)

web_src/js/modules/codeeditor/linter.ts

@@ -0,0 +1,39 @@
+import type {CodemirrorModules} from './main.ts';
+import type {Extension} from '@codemirror/state';
+
+/** Creates a linter for JSON files using `jsonParseLinter` from `@codemirror/lang-json`. */
+export async function createJsonLinter(cm: CodemirrorModules): Promise<Extension> {
+  const {jsonParseLinter} = await import('@codemirror/lang-json');
+  const baseLinter = jsonParseLinter();
+  return cm.lint.linter((view) => {
+    return baseLinter(view).map((d) => {
+      if (d.from === d.to) {
+        const line = view.state.doc.lineAt(d.from);
+        // expand to end of line content, or at least 1 char
+        d.to = Math.min(Math.max(d.from + 1, line.to), view.state.doc.length);
+      }
+      return d;
+    });
+  });
+}
+
+/** Creates a generic linter that detects Lezer parse-tree error nodes. */
+export function createSyntaxErrorLinter(cm: CodemirrorModules): Extension {
+  return cm.lint.linter((view) => {
+    const diagnostics: {from: number, to: number, severity: 'error', message: string}[] = [];
+    const tree = cm.language.syntaxTree(view.state);
+    tree.iterate({
+      enter(node) {
+        if (node.type.isError) {
+          diagnostics.push({
+            from: node.from,
+            to: node.to === node.from ? Math.min(node.from + 1, view.state.doc.length) : node.to,
+            severity: 'error',
+            message: 'Syntax error',
+          });
+        }
+      },
+    });
+    return diagnostics;
+  });
+}