import org.eclipse.xtext.xbase.XThrowExpression; //导入依赖的package包/类
@Check
public void checkInvalidReturnExpression(XExpression expression) {
	final EReference contFeature = (EReference) expression.eContainingFeature();
	final Map<EReference, EarlyExitKind> map = getDisallowedEarlyExitReferences();
	if (map.containsKey(contFeature)) {
		EarlyExitKind exitKind = map.get(contFeature);
		List<XExpression> returns = newArrayList();
		collectExits(expression, returns);
		for (XExpression expr : returns) {
			if (expr instanceof XReturnExpression && (exitKind == EarlyExitKind.RETURN || exitKind == EarlyExitKind.BOTH)) {
				error("A return expression is not allowed in this context.", expr, null, IssueCodes.INVALID_EARLY_EXIT);
			}
			if (expr instanceof XThrowExpression && (exitKind == EarlyExitKind.THROW || exitKind == EarlyExitKind.BOTH)) {
				error("A throw expression is not allowed in this context.", expr, null, IssueCodes.INVALID_EARLY_EXIT);
			}
		}
	}
}
 

import org.eclipse.xtext.xbase.XThrowExpression; //导入依赖的package包/类
protected void checkValidReturn(XReturnExpression object, ITypeComputationState state) {
	// if the expectation comes from a method's return type
	// then it is legal, thus we must check if the return is
	// contained in a throw expression
	if (hasThrowableExpectation(state) &&
			EcoreUtil2.getContainerOfType(object, XThrowExpression.class) != null) {
		state.addDiagnostic(new EObjectDiagnosticImpl(
				Severity.ERROR,
				IssueCodes.INVALID_RETURN,
				"Invalid return inside throw.",
				object,
				null,
				-1,
				new String[] { 
				}));
	}
}
 

import org.eclipse.xtext.xbase.XThrowExpression; //导入依赖的package包/类
protected void collectExits(EObject expr, List<XExpression> found) {
	if (expr instanceof XReturnExpression) {
		found.add((XExpression) expr);
	} else if (expr instanceof XThrowExpression) {
		found.add((XExpression) expr);
	} else if (expr instanceof XClosure) {
		return;
	}
	for (EObject child : expr.eContents()) {
		collectExits(child, found);
	}
}
 

import org.eclipse.xtext.xbase.XThrowExpression; //导入依赖的package包/类
protected void _computeTypes(XThrowExpression object, ITypeComputationState state) {
	LightweightTypeReference throwable = getRawTypeForName(Throwable.class, state);
	ITypeComputationState expressionState = state.withExpectation(throwable);
	ITypeComputationResult types = expressionState.computeTypes(object.getExpression());
	LightweightTypeReference thrownException = types.getActualExpressionType();
	state.acceptActualType(getPrimitiveVoid(state), ConformanceFlags.NO_IMPLICIT_RETURN | ConformanceFlags.THROWN_EXCEPTION);
	
	if (thrownException != null && !thrownException.isUnknown()) {
		if (!state.isIgnored(IssueCodes.UNHANDLED_EXCEPTION) && thrownException.isSubtypeOf(Throwable.class)
				&& !thrownException.isSubtypeOf(RuntimeException.class) && !thrownException.isSubtypeOf(Error.class)) {
			boolean declarationFound = false;
			for (LightweightTypeReference declaredException : state.getExpectedExceptions())
				if (declaredException.isAssignableFrom(thrownException)) {
					declarationFound = true;
					break;
				}
			if (!declarationFound) {
				JvmType exceptionType = thrownException.getNamedType().getType();
				state.addDiagnostic(new EObjectDiagnosticImpl(
						expressionState.getSeverity(IssueCodes.UNHANDLED_EXCEPTION),
						IssueCodes.UNHANDLED_EXCEPTION,
						"Unhandled exception type " + exceptionType.getSimpleName(),
						object,
						XbasePackage.Literals.XTHROW_EXPRESSION__EXPRESSION,
						-1,
						new String[] { 
							EcoreUtil.getURI(exceptionType).toString(),
							EcoreUtil.getURI(object).toString()
						}));
			}
		}
	}
}
 

import org.eclipse.xtext.xbase.XThrowExpression; //导入依赖的package包/类
@Override
protected void internalToConvertedExpression(XExpression obj, ITreeAppendable appendable) {
	if (obj instanceof XBlockExpression) {
		_toJavaExpression((XBlockExpression) obj, appendable);
	} else if (obj instanceof XCastedExpression) {
		_toJavaExpression((XCastedExpression) obj, appendable);
	} else if (obj instanceof XClosure) {
		_toJavaExpression((XClosure) obj, appendable);
	} else if (obj instanceof XAnnotation) {
		_toJavaExpression((XAnnotation) obj, appendable);
	} else if (obj instanceof XConstructorCall) {
		_toJavaExpression((XConstructorCall) obj, appendable);
	} else if (obj instanceof XIfExpression) {
		_toJavaExpression((XIfExpression) obj, appendable);
	} else if (obj instanceof XInstanceOfExpression) {
		_toJavaExpression((XInstanceOfExpression) obj, appendable);
	} else if (obj instanceof XSwitchExpression) {
		_toJavaExpression((XSwitchExpression) obj, appendable);
	} else if (obj instanceof XTryCatchFinallyExpression) {
		_toJavaExpression((XTryCatchFinallyExpression) obj, appendable);
	} else if (obj instanceof XListLiteral) {
		_toJavaExpression((XListLiteral) obj, appendable);
	} else if (obj instanceof XSetLiteral) {
		_toJavaExpression((XSetLiteral) obj, appendable);
	} else if (obj instanceof XSynchronizedExpression) {
		_toJavaExpression((XSynchronizedExpression) obj, appendable);
	} else if (obj instanceof XReturnExpression) {
		_toJavaExpression((XReturnExpression) obj, appendable);
	} else if (obj instanceof XThrowExpression) {
		_toJavaExpression((XThrowExpression) obj, appendable);
	} else {
		super.internalToConvertedExpression(obj, appendable);
	}
}
 

import org.eclipse.xtext.xbase.XThrowExpression; //导入依赖的package包/类
/**
 * @param isReferenced unused in this context but necessary for dispatch signature 
 */
protected void _toJavaStatement(XThrowExpression expr, ITreeAppendable b, boolean isReferenced) {
	internalToJavaStatement(expr.getExpression(), b, true);
	b.newLine().append("throw ");
	internalToConvertedExpression(expr.getExpression(), b, null);
	b.append(";");
}
 

import org.eclipse.xtext.xbase.XThrowExpression; //导入依赖的package包/类
protected Object _doEvaluate(XThrowExpression throwExpression, IEvaluationContext context, CancelIndicator indicator) {
	Object thrown = internalEvaluate(throwExpression.getExpression(), context, indicator);
	if (thrown == null) {
		return throwNullPointerException(throwExpression, "throwable expression evaluated to 'null'");
	}
	if (!(thrown instanceof Throwable)) {
		return throwClassCastException(throwExpression.getExpression(), thrown, Throwable.class);
	}
	throw new EvaluationException((Throwable) thrown);
}
 

import org.eclipse.xtext.xbase.XThrowExpression; //导入依赖的package包/类
protected void _format(final XThrowExpression expr, @Extension final IFormattableDocument format) {
  final Procedure1<IHiddenRegionFormatter> _function = (IHiddenRegionFormatter it) -> {
    it.oneSpace();
  };
  format.<XExpression>prepend(expr.getExpression(), _function);
  format.<XExpression>format(expr.getExpression());
}
 

import org.eclipse.xtext.xbase.XThrowExpression; //导入依赖的package包/类
protected Collection<IEarlyExitComputer.ExitPoint> exitPoints(final XExpression expression) {
  if (expression instanceof XDoWhileExpression) {
    return _exitPoints((XDoWhileExpression)expression);
  } else if (expression instanceof XWhileExpression) {
    return _exitPoints((XWhileExpression)expression);
  } else if (expression instanceof XAbstractFeatureCall) {
    return _exitPoints((XAbstractFeatureCall)expression);
  } else if (expression instanceof XBasicForLoopExpression) {
    return _exitPoints((XBasicForLoopExpression)expression);
  } else if (expression instanceof XBlockExpression) {
    return _exitPoints((XBlockExpression)expression);
  } else if (expression instanceof XConstructorCall) {
    return _exitPoints((XConstructorCall)expression);
  } else if (expression instanceof XForLoopExpression) {
    return _exitPoints((XForLoopExpression)expression);
  } else if (expression instanceof XIfExpression) {
    return _exitPoints((XIfExpression)expression);
  } else if (expression instanceof XReturnExpression) {
    return _exitPoints((XReturnExpression)expression);
  } else if (expression instanceof XSwitchExpression) {
    return _exitPoints((XSwitchExpression)expression);
  } else if (expression instanceof XSynchronizedExpression) {
    return _exitPoints((XSynchronizedExpression)expression);
  } else if (expression instanceof XThrowExpression) {
    return _exitPoints((XThrowExpression)expression);
  } else if (expression instanceof XTryCatchFinallyExpression) {
    return _exitPoints((XTryCatchFinallyExpression)expression);
  } else if (expression instanceof XVariableDeclaration) {
    return _exitPoints((XVariableDeclaration)expression);
  } else if (expression != null) {
    return _exitPoints(expression);
  } else {
    throw new IllegalArgumentException("Unhandled parameter types: " +
      Arrays.<Object>asList(expression).toString());
  }
}
 

import org.eclipse.xtext.xbase.XThrowExpression; //导入依赖的package包/类
protected void _format(final XThrowExpression expr, final FormattableDocument format) {
  final Procedure1<FormattingDataInit> _function = (FormattingDataInit it) -> {
    it.oneSpace();
  };
  Function1<? super FormattableDocument, ? extends Iterable<FormattingData>> _prepend = this._formattingDataFactory.prepend(this._nodeModelAccess.nodeForEObject(expr.getExpression()), _function);
  format.operator_add(_prepend);
  this.format(expr.getExpression(), format);
}
 

import org.eclipse.xtext.xbase.XThrowExpression; //导入依赖的package包/类
public boolean hasReturnExpression(final XExpression expression) {
  boolean _switchResult = false;
  boolean _matched = false;
  if (expression instanceof XReturnExpression) {
    _matched=true;
    _switchResult = true;
  }
  if (!_matched) {
    if (expression instanceof XThrowExpression) {
      _matched=true;
      _switchResult = true;
    }
  }
  if (!_matched) {
    if (expression instanceof XClosure) {
      _matched=true;
      _switchResult = false;
    }
  }
  if (!_matched) {
    final Function1<EObject, Boolean> _function = (EObject content) -> {
      boolean _switchResult_1 = false;
      boolean _matched_1 = false;
      if (content instanceof XExpression) {
        _matched_1=true;
        _switchResult_1 = this.hasReturnExpression(((XExpression)content));
      }
      if (!_matched_1) {
        _switchResult_1 = false;
      }
      return Boolean.valueOf(_switchResult_1);
    };
    _switchResult = IterableExtensions.<EObject>exists(expression.eContents(), _function);
  }
  return _switchResult;
}
 

import org.eclipse.xtext.xbase.XThrowExpression; //导入依赖的package包/类
@Test public void testUnreachableCode_01() throws Exception {
	XBlockExpression expression = (XBlockExpression) expression(
			"{" +
			"	while (false) {" +
			"      throw new Exception() " +
			"   }" +
			"   null" +
			"}");
	XWhileExpression whileLoop = (XWhileExpression) expression.getExpressions().get(0);
	XThrowExpression throwExpression = (XThrowExpression) ((XBlockExpression) whileLoop.getBody()).getExpressions().get(0);
	helper.assertError(throwExpression, XbasePackage.Literals.XTHROW_EXPRESSION, UNREACHABLE_CODE);
}
 

import org.eclipse.xtext.xbase.XThrowExpression; //导入依赖的package包/类
protected void doTestTryCatchExpression(XTryCatchFinallyExpression tryEx) {
	assertFeatureCall("foo", ((XThrowExpression)tryEx.getExpression()).getExpression());
	assertFeatureCall("baz", tryEx.getFinallyExpression());
	
	assertEquals(1,tryEx.getCatchClauses().size());
	XCatchClause clause = tryEx.getCatchClauses().get(0);
	assertFeatureCall("bar", clause.getExpression());
	assertEquals("java.lang.Exception", clause.getDeclaredParam().getParameterType().getIdentifier());
	assertEquals("e", clause.getDeclaredParam().getName());
}
 

import org.eclipse.xtext.xbase.XThrowExpression; //导入依赖的package包/类
/**
 * Constraint:
 *     expression=XExpression
 */
protected void sequence_XThrowExpression(EObject context, XThrowExpression semanticObject) {
	if(errorAcceptor != null) {
		if(transientValues.isValueTransient(semanticObject, XbasePackage.Literals.XTHROW_EXPRESSION__EXPRESSION) == ValueTransient.YES)
			errorAcceptor.accept(diagnosticProvider.createFeatureValueMissing(semanticObject, XbasePackage.Literals.XTHROW_EXPRESSION__EXPRESSION));
	}
	INodesForEObjectProvider nodes = createNodeProvider(semanticObject);
	SequenceFeeder feeder = createSequencerFeeder(semanticObject, nodes);
	feeder.accept(grammarAccess.getXThrowExpressionAccess().getExpressionXExpressionParserRuleCall_2_0(), semanticObject.getExpression());
	feeder.finish();
}
 

import org.eclipse.xtext.xbase.XThrowExpression; //导入依赖的package包/类
@Deprecated
protected void sequence_XThrowExpression(EObject context, XThrowExpression semanticObject) {
	sequence_XThrowExpression(createContext(context, semanticObject), semanticObject);
}
 

import org.eclipse.xtext.xbase.XThrowExpression; //导入依赖的package包/类
protected boolean isValueExpectedRecursive(XExpression expr) {
	EStructuralFeature feature = expr.eContainingFeature();
	EObject container = expr.eContainer();
	
	// is part of block
	if (container instanceof XBlockExpression) {
		XBlockExpression blockExpression = (XBlockExpression) container;
		final List<XExpression> expressions = blockExpression.getExpressions();
		if (expressions.get(expressions.size()-1) != expr) {
			return false;
		}
	}
	// no expectation cases
	if (feature == XbasePackage.Literals.XTRY_CATCH_FINALLY_EXPRESSION__FINALLY_EXPRESSION
		|| feature == XbasePackage.Literals.XABSTRACT_WHILE_EXPRESSION__BODY
		|| feature == XbasePackage.Literals.XFOR_LOOP_EXPRESSION__EACH_EXPRESSION) {
		return false;
	}
	// is value expected
	if (container instanceof XAbstractFeatureCall 
		|| container instanceof XConstructorCall
		|| container instanceof XAssignment
		|| container instanceof XVariableDeclaration
		|| container instanceof XReturnExpression
		|| container instanceof XThrowExpression
		|| feature == XbasePackage.Literals.XFOR_LOOP_EXPRESSION__FOR_EXPRESSION
		|| feature == XbasePackage.Literals.XSWITCH_EXPRESSION__SWITCH
		|| feature == XbasePackage.Literals.XCASE_PART__CASE
		|| feature == XbasePackage.Literals.XIF_EXPRESSION__IF
		|| feature == XbasePackage.Literals.XABSTRACT_WHILE_EXPRESSION__PREDICATE
		|| feature == XbasePackage.Literals.XBASIC_FOR_LOOP_EXPRESSION__EXPRESSION
		|| feature == XbasePackage.Literals.XSYNCHRONIZED_EXPRESSION__PARAM) {
		return true;
	}
	if (isLocalClassSemantics(container) || logicalContainerProvider.getLogicalContainer(expr) != null) {
		LightweightTypeReference expectedReturnType = typeResolver.resolveTypes(expr).getExpectedReturnType(expr);
		return expectedReturnType == null || !expectedReturnType.isPrimitiveVoid();
	}
	if (container instanceof XCasePart || container instanceof XCatchClause) {
		container = container.eContainer();
	}
	if (container instanceof XExpression) {
		return isValueExpectedRecursive((XExpression) container);
	}
	return true;
}
 

import org.eclipse.xtext.xbase.XThrowExpression; //导入依赖的package包/类
@Override
public void computeTypes(XExpression expression, ITypeComputationState state) {
	if (expression instanceof XAssignment) {
		_computeTypes((XAssignment)expression, state);
	} else if (expression instanceof XAbstractFeatureCall) {
		_computeTypes((XAbstractFeatureCall)expression, state);
	} else if (expression instanceof XDoWhileExpression) {
		_computeTypes((XDoWhileExpression)expression, state);
	} else if (expression instanceof XWhileExpression) {
		_computeTypes((XWhileExpression)expression, state);
	} else if (expression instanceof XBlockExpression) {
		_computeTypes((XBlockExpression)expression, state);
	} else if (expression instanceof XBooleanLiteral) {
		_computeTypes((XBooleanLiteral)expression, state);
	} else if (expression instanceof XCastedExpression) {
		_computeTypes((XCastedExpression)expression, state);
	} else if (expression instanceof XClosure) {
		_computeTypes((XClosure)expression, state);
	} else if (expression instanceof XConstructorCall) {
		_computeTypes((XConstructorCall)expression, state);
	} else if (expression instanceof XForLoopExpression) {
		_computeTypes((XForLoopExpression)expression, state);
	} else if (expression instanceof XBasicForLoopExpression) {
		_computeTypes((XBasicForLoopExpression)expression, state);
	} else if (expression instanceof XIfExpression) {
		_computeTypes((XIfExpression)expression, state);
	} else if (expression instanceof XInstanceOfExpression) {
		_computeTypes((XInstanceOfExpression)expression, state);
	} else if (expression instanceof XNumberLiteral) {
		_computeTypes((XNumberLiteral)expression, state);
	} else if (expression instanceof XNullLiteral) {
		_computeTypes((XNullLiteral)expression, state);
	} else if (expression instanceof XReturnExpression) {
		_computeTypes((XReturnExpression)expression, state);
	} else if (expression instanceof XStringLiteral) {
		_computeTypes((XStringLiteral)expression, state);
	} else if (expression instanceof XSwitchExpression) {
		_computeTypes((XSwitchExpression)expression, state);
	} else if (expression instanceof XThrowExpression) {
		_computeTypes((XThrowExpression)expression, state);
	} else if (expression instanceof XTryCatchFinallyExpression) {
		_computeTypes((XTryCatchFinallyExpression)expression, state);
	} else if (expression instanceof XTypeLiteral) {
		_computeTypes((XTypeLiteral)expression, state);
	} else if (expression instanceof XVariableDeclaration) {
		_computeTypes((XVariableDeclaration)expression, state);
	} else if (expression instanceof XListLiteral) {
		_computeTypes((XListLiteral)expression, state);
	} else if (expression instanceof XSetLiteral) {
		_computeTypes((XSetLiteral)expression, state);
	} else if (expression instanceof XSynchronizedExpression) {
		_computeTypes((XSynchronizedExpression)expression, state);
	} else {
		throw new UnsupportedOperationException("Missing type computation for expression type: " + expression.eClass().getName() + " / " + state);
	}
}
 

import org.eclipse.xtext.xbase.XThrowExpression; //导入依赖的package包/类
@Override
public Boolean caseXThrowExpression(XThrowExpression object) {
	accept(getType(object.getExpression()));
	return Boolean.TRUE;
}
 

import org.eclipse.xtext.xbase.XThrowExpression; //导入依赖的package包/类
/**
 * Returns <code>true</code> for expressions that seem to be early exit expressions, e.g.
 * <pre>
 *   while(condition) {
 *     if (anotherCondition)
 *       return value
 *     changeResultOfFirstCondition
 *   }
 * </pre>
 */
public boolean isIntentionalEarlyExit(/* @Nullable */ XExpression expression) {
	if (expression == null) {
		return true;
	}
	if (expression instanceof XBlockExpression) {
		XBlockExpression block = (XBlockExpression) expression;
		List<XExpression> children = block.getExpressions();
		for(XExpression child: children) {
			if (isIntentionalEarlyExit(child)) {
				return true;
			}
		}
	} else if (expression instanceof XIfExpression) {
		return isIntentionalEarlyExit(((XIfExpression) expression).getThen()) 
				|| isIntentionalEarlyExit(((XIfExpression) expression).getElse());
	} else if (expression instanceof XSwitchExpression) {
		XSwitchExpression switchExpression = (XSwitchExpression) expression;
		for(XCasePart caseExpression: switchExpression.getCases()) {
			if (isIntentionalEarlyExit(caseExpression.getThen())) {
				return true;
			}
		}
		if (isIntentionalEarlyExit(switchExpression.getDefault())) {
			return true;
		}
	} else if (expression instanceof XTryCatchFinallyExpression) {
		XTryCatchFinallyExpression tryCatchFinally = (XTryCatchFinallyExpression) expression;
		if (isIntentionalEarlyExit(tryCatchFinally.getExpression())) {
			for(XCatchClause catchClause: tryCatchFinally.getCatchClauses()) {
				if (!isIntentionalEarlyExit(catchClause.getExpression()))
					return false;
			}
			return true;
		}
		return false;
	} else if (expression instanceof XAbstractWhileExpression) {
		return isIntentionalEarlyExit(((XAbstractWhileExpression) expression).getBody());
	} else if (expression instanceof XForLoopExpression) {
		return isIntentionalEarlyExit(((XForLoopExpression) expression).getEachExpression());
	} else if (expression instanceof XBasicForLoopExpression) {
		return isIntentionalEarlyExit(((XBasicForLoopExpression) expression).getEachExpression());
	} else if (expression instanceof XSynchronizedExpression) {
		return isIntentionalEarlyExit(((XSynchronizedExpression) expression).getExpression());
	}
	return expression instanceof XReturnExpression || expression instanceof XThrowExpression;
}
 

import org.eclipse.xtext.xbase.XThrowExpression; //导入依赖的package包/类
public boolean isDefiniteEarlyExit(XExpression expression) {
	// TODO further improvements
	if (expression instanceof XIfExpression) {
		XIfExpression ifExpression = (XIfExpression) expression;
		return isDefiniteEarlyExit(ifExpression.getThen()) && isDefiniteEarlyExit(ifExpression.getElse());
	} else if (expression instanceof XSwitchExpression) {
		XSwitchExpression switchExpression = (XSwitchExpression) expression;
		if (isDefiniteEarlyExit(switchExpression.getDefault())) {
			for(XCasePart caseExpression: switchExpression.getCases()) {
				if (!isDefiniteEarlyExit(caseExpression.getThen())) {
					return false;
				}
			}
			return true;
		}
		return false;
	} else if (expression instanceof XTryCatchFinallyExpression) {
		XTryCatchFinallyExpression tryExpression = (XTryCatchFinallyExpression) expression;
		if (isDefiniteEarlyExit(tryExpression.getFinallyExpression())) {
			return true;
		}
		if (isDefiniteEarlyExit(tryExpression.getExpression())) {
			for(XCatchClause catchClause: tryExpression.getCatchClauses()) {
				if (!isDefiniteEarlyExit(catchClause.getExpression())) {
					return false;
				}
			}
			return true;
		}
		return false;
	} else if (expression instanceof XBlockExpression) {
		List<XExpression> expressions = ((XBlockExpression) expression).getExpressions();
		for(int i = expressions.size() - 1; i >= 0; i--) {
			if (isDefiniteEarlyExit(expressions.get(i))) {
				return true;
			}
		}
	} else if (expression instanceof XSynchronizedExpression) {
		return isDefiniteEarlyExit(((XSynchronizedExpression) expression).getExpression());
	}
	return expression instanceof XReturnExpression || expression instanceof XThrowExpression;
}