Support for parser error diagnostics

Author: SSlinky

server/src/capabilities/diagnostics.ts

@@ -124,4 +124,11 @@ export class LegacyFunctionalityDiagnostic extends BaseDiagnostic {
 	constructor(range: Range, functionalityType: string) {
 		super(range, `${functionalityType} are legacy functionality and should be avoided.`);
 	}
+}
+
+export class ParserErrorDiagnostic extends BaseDiagnostic {
+	severity = DiagnosticSeverity.Error;
+	constructor(range: Range, msg: string) {
+		super(range, msg);
+	}
 }

server/src/project/elements/generic.ts

@@ -0,0 +1,21 @@
+// Core
+import { TextDocument } from 'vscode-languageserver-textdocument';
+
+// Antlr
+import { ErrorNode, ParserRuleContext } from 'antlr4ng';
+
+// Project
+import { BaseContextSyntaxElement, BaseSyntaxElement } from './base';
+import { DiagnosticCapability } from '../../capabilities/capabilities';
+import { ParserErrorDiagnostic } from '../../capabilities/diagnostics';
+
+
+export class ErrorRuleElement extends BaseContextSyntaxElement<ParserRuleContext> {
+	constructor(node: ErrorNode, doc: TextDocument) {
+		super(node.parent as ParserRuleContext, doc);
+		this.diagnosticCapability = new DiagnosticCapability(this);
+		this.diagnosticCapability.diagnostics.push(
+			new ParserErrorDiagnostic(this.context.range, node.getText())
+		);
+	}
+}

server/src/project/workspace.ts

@@ -118,11 +118,11 @@ export class Workspace implements IWorkspace {
 			await this.activeDocument.parseAsync(this.parseCancellationTokenSource.token);
 			this.logger.info(`Parsed ${this.activeDocument.name}`);
 			this.connection.sendDiagnostics(this.activeDocument.languageServerDiagnostics());
-	} catch (e) {
+		} catch (e) {
 			// Swallow cancellation exceptions. They're good. We like these.
 			if (e instanceof ParseCancellationException) { }
 			else if (e instanceof Error) { this.logger.stack(e); }
-			else { this.logger.error('Something went wrong.')}
+			else { this.logger.error('Something went wrong.') }
 		}
 
 		this.parseCancellationTokenSource = undefined;
@@ -328,6 +328,7 @@ class WorkspaceEvents {
 	}
 
 	private async onDocumentSymbolAsync(params: DocumentSymbolParams, token: CancellationToken): Promise<SymbolInformation[]> {
+		Services.logger.debug('[event] onDocumentSymbol');
 		const document = await this.getParsedProjectDocument(params.textDocument.uri, 0, token);
 		return document?.languageServerSymbolInformation() ?? [];
 	}