Reveal the error location after on failed verify.

Closes #608
Closes #229

Signed-off-by: Akos Kitta <a.kitta@arduino.cc>

arduino-ide-extension/src/browser/contributions/core-error-handler.ts

@@ -0,0 +1,32 @@
+import { Emitter, Event } from '@theia/core';
+import { injectable } from '@theia/core/shared/inversify';
+import { CoreError } from '../../common/protocol/core-service';
+
+@injectable()
+export class CoreErrorHandler {
+  private readonly compilerErrors: CoreError.Compiler[] = [];
+  private readonly compilerErrorsDidChangeEmitter = new Emitter<
+    CoreError.Compiler[]
+  >();
+
+  tryHandle(error: unknown): void {
+    if (CoreError.is(error)) {
+      this.compilerErrors.length = 0;
+      this.compilerErrors.push(...error.data.filter(CoreError.Compiler.is));
+      this.fireCompilerErrorsDidChange();
+    }
+  }
+
+  reset(): void {
+    this.compilerErrors.length = 0;
+    this.fireCompilerErrorsDidChange();
+  }
+
+  get onCompilerErrorsDidChange(): Event<CoreError.Compiler[]> {
+    return this.compilerErrorsDidChangeEmitter.event;
+  }
+
+  private fireCompilerErrorsDidChange(): void {
+    this.compilerErrorsDidChangeEmitter.fire(this.compilerErrors.slice());
+  }
+}