Don't underline the entire schema for top-level errors/warnings

Signed-off-by: Juan Cruz Viotti <[email protected]>

Author: jviotti

test/vscode/extension.test.ts

@@ -214,6 +214,97 @@ suite('Extension Test Suite', () => {
             'Sourcemeta Studio should still report metaschema errors');
     });
 
+    test('Should clamp root-level lint diagnostics to first token', async function() {
+        this.timeout(15000);
+
+        const extension = vscode.extensions.getExtension('sourcemeta.sourcemeta-studio');
+        if (extension && !extension.isActive) {
+            await extension.activate();
+        }
+
+        const fixtureDir = path.join(__dirname, '..', '..', '..', 'test', 'vscode', 'fixtures');
+        const schemaPath = path.join(fixtureDir, 'root-only-lint-schema.json');
+
+        const document = await vscode.workspace.openTextDocument(vscode.Uri.file(schemaPath));
+        await vscode.window.showTextDocument(document);
+
+        await vscode.commands.executeCommand('sourcemeta-studio.openPanel');
+
+        await new Promise(resolve => setTimeout(resolve, 5000));
+
+        const diagnostics = vscode.languages.getDiagnostics(document.uri);
+
+        const lintDiagnostics = diagnostics.filter(diagnostic =>
+            diagnostic.source === 'Sourcemeta Studio (Lint)');
+
+        assert.ok(lintDiagnostics.length > 0,
+            'Root-level lint issues should still produce diagnostics');
+
+        for (const diagnostic of lintDiagnostics) {
+            assert.strictEqual(diagnostic.range.start.line, 0,
+                'Root-level diagnostic should start at line 0');
+            assert.strictEqual(diagnostic.range.start.character, 0,
+                'Root-level diagnostic should start at character 0');
+            assert.strictEqual(diagnostic.range.end.line, 0,
+                'Root-level diagnostic should not extend beyond line 0');
+            assert.strictEqual(diagnostic.range.end.character, 0,
+                'Root-level diagnostic should have zero-width range');
+        }
+    });
+
+    test('Should clamp root-level metaschema diagnostics to first token', async function() {
+        this.timeout(15000);
+
+        const extension = vscode.extensions.getExtension('sourcemeta.sourcemeta-studio');
+        if (extension && !extension.isActive) {
+            await extension.activate();
+        }
+
+        const fixtureDir = path.join(__dirname, '..', '..', '..', 'test', 'vscode', 'fixtures');
+        const schemaPath = path.join(fixtureDir, 'invalid-metaschema.json');
+
+        const document = await vscode.workspace.openTextDocument(vscode.Uri.file(schemaPath));
+        await vscode.window.showTextDocument(document);
+
+        await vscode.commands.executeCommand('sourcemeta-studio.openPanel');
+
+        await new Promise(resolve => setTimeout(resolve, 5000));
+
+        const diagnostics = vscode.languages.getDiagnostics(document.uri);
+
+        const metaschemaDiagnostics = diagnostics.filter(diagnostic =>
+            diagnostic.source === 'Sourcemeta Studio (Metaschema)');
+
+        assert.ok(metaschemaDiagnostics.length > 0,
+            'Metaschema errors should produce diagnostics');
+
+        const rootDiagnostics = metaschemaDiagnostics.filter(diagnostic =>
+            diagnostic.range.start.line === 0);
+
+        assert.ok(rootDiagnostics.length > 0,
+            'Should have root-level metaschema diagnostics');
+
+        for (const diagnostic of rootDiagnostics) {
+            assert.strictEqual(diagnostic.range.start.character, 0,
+                'Root-level metaschema diagnostic should start at character 0');
+            assert.strictEqual(diagnostic.range.end.line, 0,
+                'Root-level metaschema diagnostic should not extend beyond line 0');
+            assert.strictEqual(diagnostic.range.end.character, 0,
+                'Root-level metaschema diagnostic should have zero-width range');
+        }
+
+        const nonRootDiagnostics = metaschemaDiagnostics.filter(diagnostic =>
+            diagnostic.range.start.line > 0);
+
+        assert.ok(nonRootDiagnostics.length > 0,
+            'Should also have non-root metaschema diagnostics');
+
+        for (const diagnostic of nonRootDiagnostics) {
+            assert.ok(diagnostic.range.end.character > diagnostic.range.start.character,
+                'Non-root metaschema diagnostic should retain a non-zero-width range');
+        }
+    });
+
     test('Should run linter even when metaschema validation fails', async function() {
         this.timeout(15000);
 

test/vscode/fixtures/root-only-lint-schema.json

@@ -0,0 +1,4 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "type": "object"
+}

vscode/src/utils/fileUtils.ts

@@ -262,9 +262,24 @@ export function arrayToPosition(arr: [number, number]): vscode.Position {
 /**
  * Convert error position array to VS Code range
  * Position array is 1-based and inclusive, VS Code is 0-based and end-exclusive
+ *
+ * When a diagnostic applies to the root of the document (position spanning
+ * from line 1, column 1 across multiple lines), we collapse the range to
+ * a zero-width range at (0,0). VS Code renders this by expanding the
+ * squiggle to the first word, matching what ESLint and Pylint do. VS Code
+ * does not support file-level diagnostics without a range:
+ * https://github.com/microsoft/vscode/issues/238608
  */
 export function errorPositionToRange(position: Position): vscode.Range {
     const [lineStart, columnStart, lineEnd, columnEnd] = position;
+
+    if (lineStart === 1 && columnStart === 1 && lineEnd > lineStart) {
+        return new vscode.Range(
+            new vscode.Position(0, 0),
+            new vscode.Position(0, 0)
+        );
+    }
+
     return new vscode.Range(
         new vscode.Position(lineStart - 1, columnStart - 1),
         new vscode.Position(lineEnd - 1, columnEnd)