/*
* Copyright (c) 2011 Google Inc.
*
* All rights reserved. This program and the accompanying materials are made available under the terms of the Eclipse
* Public License v1.0 which accompanies this distribution, and is available at
*
* http://www.eclipse.org/legal/epl-v10.html
*/
package com.google.eclipse.protobuf.validation;
import static org.eclipse.xtext.diagnostics.Diagnostic.SYNTAX_DIAGNOSTIC;
import static com.google.eclipse.protobuf.validation.Messages.expectedFieldName;
import static com.google.eclipse.protobuf.validation.Messages.missingFieldNumber;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.xtext.nodemodel.SyntaxErrorMessage;
import org.eclipse.xtext.parser.antlr.SyntaxErrorMessageProvider;
import com.google.eclipse.protobuf.protobuf.MessageField;
/**
* Messages for syntax errors.
*
* @author alruiz@google.com (Alex Ruiz)
*/
public class ProtobufSyntaxErrorMessageProvider extends SyntaxErrorMessageProvider {
@Override public SyntaxErrorMessage getSyntaxErrorMessage(IParserErrorContext context) {
String message = context.getDefaultMessage();
EObject currentContext = context.getCurrentContext();
if (currentContext instanceof MessageField) {
message = mapToProtocMessage(message, (MessageField) currentContext);
}
if (currentContext == null && message.contains("RULE_STRING")) {
return null;
}
return new SyntaxErrorMessage(message, SYNTAX_DIAGNOSTIC);
}
private String mapToProtocMessage(String message, MessageField field) {
if (message.contains("RULE_ID") && field.getName() == null) {
return expectedFieldName;
}
if (message.equals("mismatched input ';' expecting '='") && field.getIndex() == 0) {
return missingFieldNumber;
}
return message;
}
}