org.eclipse.xtext.xbase.XWhileExpression Java Examples

@Check
public void checkDeadCode(XWhileExpression loop) {
	XExpression predicate = loop.getPredicate();
	if (!earlyExitComputer.isEarlyExit(predicate)) {
		Optional<BooleanResult> result = getBooleanResult(predicate);
		if (result.isPresent()) {
			BooleanResult booleanResult = result.get();
			markConstantBooleanCondition(predicate, booleanResult, true);
			if (booleanResult.isCompileTimeConstant() && !booleanResult.getValue().or(Boolean.TRUE)) {
				markAsDeadCode(loop.getBody());
			}
		}
	} else {
		markAsDeadCode(loop.getBody());
	}
}
 

protected Collection<IEarlyExitComputer.ExitPoint> _exitPoints(final XWhileExpression expression) {
  Collection<IEarlyExitComputer.ExitPoint> exitPoints = this.getExitPoints(expression.getPredicate());
  boolean _isNotEmpty = this.isNotEmpty(exitPoints);
  if (_isNotEmpty) {
    return exitPoints;
  }
  boolean _isBooleanConstant = this.isBooleanConstant(expression.getPredicate(), true);
  if (_isBooleanConstant) {
    exitPoints = this.getExitPoints(expression.getBody());
    boolean _isNotEmpty_1 = this.isNotEmpty(exitPoints);
    if (_isNotEmpty_1) {
      return exitPoints;
    }
    IEarlyExitComputer.ExitPoint _exitPoint = new IEarlyExitComputer.ExitPoint(expression, false);
    return Collections.<IEarlyExitComputer.ExitPoint>singletonList(_exitPoint);
  }
  return Collections.<IEarlyExitComputer.ExitPoint>emptyList();
}
 

/**
 * @param isReferenced unused in this context but necessary for dispatch signature 
 */
protected void _toJavaStatement(XWhileExpression expr, ITreeAppendable b, boolean isReferenced) {
	boolean needsStatement = !canCompileToJavaExpression(expr.getPredicate(), b);
	String varName = null;
	if (needsStatement) {
		internalToJavaStatement(expr.getPredicate(), b, true);
		varName = b.declareSyntheticVariable(expr, "_while");
		b.newLine().append("boolean ").append(varName).append(" = ");
		internalToJavaExpression(expr.getPredicate(), b);
		b.append(";");
	}
	b.newLine().append("while (");
	if (needsStatement) {
		b.append(varName);
	} else {
		internalToJavaExpression(expr.getPredicate(), b);
	}
	b.append(") {").increaseIndentation();
	b.openPseudoScope();
	internalToJavaStatement(expr.getBody(), b, false);
	if (needsStatement && !isEarlyExit(expr.getBody())) {
		internalToJavaStatement(expr.getPredicate(), b, true);
		b.newLine();
		b.append(varName).append(" = ");
		internalToJavaExpression(expr.getPredicate(), b);
		b.append(";");
	}
	b.closeScope();
	b.decreaseIndentation().newLine().append("}");
}
 

protected Object _doEvaluate(XWhileExpression whileLoop, IEvaluationContext context, CancelIndicator indicator) {
	Object condition = internalEvaluate(whileLoop.getPredicate(), context, indicator);
	while (Boolean.TRUE.equals(condition)) {
		internalEvaluate(whileLoop.getBody(), context, indicator);
		condition = internalEvaluate(whileLoop.getPredicate(), context, indicator);
	}
	return null;
}
 

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());
  }
}
 

@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);
}
 

/** Generate the given object.
 *
 * @param whileLoop the while-loop.
 * @param it the target for the generated content.
 * @param context the context.
 * @return the last statement in the loop or {@code null}.
 */
protected XExpression _generate(XWhileExpression whileLoop, IAppendable it, IExtraLanguageGeneratorContext context) {
	it.append("while "); //$NON-NLS-1$
	generate(whileLoop.getPredicate(), it, context);
	it.append(":"); //$NON-NLS-1$
	it.increaseIndentation().newLine();
	final XExpression last = generate(whileLoop.getBody(), it, context);
	it.decreaseIndentation();
	return last;
}
 

@Deprecated
protected void sequence_XWhileExpression(EObject context, XWhileExpression semanticObject) {
	sequence_XWhileExpression(createContext(context, semanticObject), semanticObject);
}
 

@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);
	}
}
 

protected void _computeTypes(XWhileExpression object, ITypeComputationState state) {
	computeWhileLoopBody(object, state, true);
	
	LightweightTypeReference primitiveVoid = getPrimitiveVoid(state);
	state.acceptActualType(primitiveVoid);
}
 

@Override
protected void doInternalToJavaStatement(XExpression obj, ITreeAppendable appendable, boolean isReferenced) {
	if (obj instanceof XBlockExpression) {
		_toJavaStatement((XBlockExpression) obj, appendable, isReferenced);
	} else if (obj instanceof XCastedExpression) {
		_toJavaStatement((XCastedExpression) obj, appendable, isReferenced);
	} else if (obj instanceof XClosure) {
		_toJavaStatement((XClosure) obj, appendable, isReferenced);
	} else if (obj instanceof XConstructorCall) {
		_toJavaStatement((XConstructorCall) obj, appendable, isReferenced);
	} else if (obj instanceof XDoWhileExpression) {
		_toJavaStatement((XDoWhileExpression) obj, appendable, isReferenced);
	} else if (obj instanceof XForLoopExpression) {
		_toJavaStatement((XForLoopExpression) obj, appendable, isReferenced);
	} else if (obj instanceof XBasicForLoopExpression) {
		_toJavaStatement((XBasicForLoopExpression) obj, appendable, isReferenced);
	} else if (obj instanceof XIfExpression) {
		_toJavaStatement((XIfExpression) obj, appendable, isReferenced);
	} else if (obj instanceof XInstanceOfExpression) {
		_toJavaStatement((XInstanceOfExpression) obj, appendable, isReferenced);
	} else if (obj instanceof XReturnExpression) {
		_toJavaStatement((XReturnExpression) obj, appendable, isReferenced);
	} else if (obj instanceof XSwitchExpression) {
		_toJavaStatement((XSwitchExpression) obj, appendable, isReferenced);
	} else if (obj instanceof XThrowExpression) {
		_toJavaStatement((XThrowExpression) obj, appendable, isReferenced);
	} else if (obj instanceof XTryCatchFinallyExpression) {
		_toJavaStatement((XTryCatchFinallyExpression) obj, appendable, isReferenced);
	} else if (obj instanceof XVariableDeclaration) {
		_toJavaStatement((XVariableDeclaration) obj, appendable, isReferenced);
	} else if (obj instanceof XWhileExpression) {
		_toJavaStatement((XWhileExpression) obj, appendable, isReferenced);
	} else if (obj instanceof XListLiteral) {
		_toJavaStatement((XListLiteral) obj, appendable, isReferenced);
	} else if (obj instanceof XSetLiteral) {
		_toJavaStatement((XSetLiteral) obj, appendable, isReferenced);
	} else if (obj instanceof XSynchronizedExpression) {
		_toJavaStatement((XSynchronizedExpression) obj, appendable, isReferenced);
	} else {
		super.doInternalToJavaStatement(obj, appendable, isReferenced);
	}
}
 

/**
 * don't call this directly. Always call evaluate() internalEvaluate()
 */
protected Object doEvaluate(XExpression expression, IEvaluationContext context, CancelIndicator indicator) {
	if (expression instanceof XAssignment) {
      return _doEvaluate((XAssignment)expression, context, indicator);
    } else if (expression instanceof XDoWhileExpression) {
      return _doEvaluate((XDoWhileExpression)expression, context, indicator);
    } else if (expression instanceof XMemberFeatureCall) {
      return _doEvaluate((XMemberFeatureCall)expression, context, indicator);
    } else if (expression instanceof XWhileExpression) {
      return _doEvaluate((XWhileExpression)expression, context, indicator);
    } else if (expression instanceof XFeatureCall) {
    	return _doEvaluate((XFeatureCall)expression, context, indicator);
    } else if (expression instanceof XAbstractFeatureCall) {
    	return _doEvaluate((XAbstractFeatureCall)expression, context, indicator);
    } else if (expression instanceof XBlockExpression) {
      return _doEvaluate((XBlockExpression)expression, context, indicator);
    } else if (expression instanceof XSynchronizedExpression) {
	  return _doEvaluate((XSynchronizedExpression)expression, context, indicator);
	} else if (expression instanceof XBooleanLiteral) {
      return _doEvaluate((XBooleanLiteral)expression, context, indicator);
    } else if (expression instanceof XCastedExpression) {
      return _doEvaluate((XCastedExpression)expression, context, indicator);
    } else if (expression instanceof XClosure) {
      return _doEvaluate((XClosure)expression, context, indicator);
    } else if (expression instanceof XConstructorCall) {
      return _doEvaluate((XConstructorCall)expression, context, indicator);
    } else if (expression instanceof XForLoopExpression) {
      return _doEvaluate((XForLoopExpression)expression, context, indicator);
    } else if (expression instanceof XBasicForLoopExpression) {
	  return _doEvaluate((XBasicForLoopExpression)expression, context, indicator);
	} else if (expression instanceof XIfExpression) {
      return _doEvaluate((XIfExpression)expression, context, indicator);
    } else if (expression instanceof XInstanceOfExpression) {
      return _doEvaluate((XInstanceOfExpression)expression, context, indicator);
    } else if (expression instanceof XNullLiteral) {
      return _doEvaluate((XNullLiteral)expression, context, indicator);
    } else if (expression instanceof XNumberLiteral) {
      return _doEvaluate((XNumberLiteral)expression, context, indicator);
    } else if (expression instanceof XReturnExpression) {
      return _doEvaluate((XReturnExpression)expression, context, indicator);
    } else if (expression instanceof XStringLiteral) {
      return _doEvaluate((XStringLiteral)expression, context, indicator);
    } else if (expression instanceof XSwitchExpression) {
      return _doEvaluate((XSwitchExpression)expression, context, indicator);
    } else if (expression instanceof XThrowExpression) {
      return _doEvaluate((XThrowExpression)expression, context, indicator);
    } else if (expression instanceof XTryCatchFinallyExpression) {
      return _doEvaluate((XTryCatchFinallyExpression)expression, context, indicator);
    } else if (expression instanceof XTypeLiteral) {
      return _doEvaluate((XTypeLiteral)expression, context, indicator);
    } else if (expression instanceof XVariableDeclaration) {
	      return _doEvaluate((XVariableDeclaration)expression, context, indicator);
    } else if (expression instanceof XListLiteral) {
	      return _doEvaluate((XListLiteral)expression, context, indicator);
    } else if (expression instanceof XSetLiteral) {
	      return _doEvaluate((XSetLiteral)expression, context, indicator);
    } else {
      throw new IllegalArgumentException("Unhandled parameter types: " +
        Arrays.<Object>asList(expression, context, indicator).toString());
    }
}
 

@Test public void testWhileExpression() throws Exception {
	XWhileExpression expression = (XWhileExpression) expression("while (true) 'foo'");
	assertTrue(expression.getPredicate() instanceof XBooleanLiteral);
	assertTrue(expression.getBody() instanceof XStringLiteral);
}
 

@Test public void testWhileExpression_0() throws Exception {
	XWhileExpression exp = (XWhileExpression) expression("while (null) null");

	assertExpected("boolean", exp.getPredicate()); // while (null) is invalid thus we expect the primitive boolean
	assertExpected(null, exp.getBody());
}
 

/**
 * Contexts:
 *     XExpression returns XWhileExpression
 *     XAssignment returns XWhileExpression
 *     XAssignment.XBinaryOperation_1_1_0_0_0 returns XWhileExpression
 *     XOrExpression returns XWhileExpression
 *     XOrExpression.XBinaryOperation_1_0_0_0 returns XWhileExpression
 *     XAndExpression returns XWhileExpression
 *     XAndExpression.XBinaryOperation_1_0_0_0 returns XWhileExpression
 *     XEqualityExpression returns XWhileExpression
 *     XEqualityExpression.XBinaryOperation_1_0_0_0 returns XWhileExpression
 *     XRelationalExpression returns XWhileExpression
 *     XRelationalExpression.XInstanceOfExpression_1_0_0_0_0 returns XWhileExpression
 *     XRelationalExpression.XBinaryOperation_1_1_0_0_0 returns XWhileExpression
 *     XOtherOperatorExpression returns XWhileExpression
 *     XOtherOperatorExpression.XBinaryOperation_1_0_0_0 returns XWhileExpression
 *     XAdditiveExpression returns XWhileExpression
 *     XAdditiveExpression.XBinaryOperation_1_0_0_0 returns XWhileExpression
 *     XMultiplicativeExpression returns XWhileExpression
 *     XMultiplicativeExpression.XBinaryOperation_1_0_0_0 returns XWhileExpression
 *     XUnaryOperation returns XWhileExpression
 *     XCastedExpression returns XWhileExpression
 *     XCastedExpression.XCastedExpression_1_0_0_0 returns XWhileExpression
 *     XPostfixOperation returns XWhileExpression
 *     XPostfixOperation.XPostfixOperation_1_0_0 returns XWhileExpression
 *     XMemberFeatureCall returns XWhileExpression
 *     XMemberFeatureCall.XAssignment_1_0_0_0_0 returns XWhileExpression
 *     XMemberFeatureCall.XMemberFeatureCall_1_1_0_0_0 returns XWhileExpression
 *     XPrimaryExpression returns XWhileExpression
 *     XParenthesizedExpression returns XWhileExpression
 *     XWhileExpression returns XWhileExpression
 *     XExpressionOrVarDeclaration returns XWhileExpression
 *
 * Constraint:
 *     (predicate=XExpression body=XExpression)
 */
protected void sequence_XWhileExpression(ISerializationContext context, XWhileExpression semanticObject) {
	if (errorAcceptor != null) {
		if (transientValues.isValueTransient(semanticObject, XbasePackage.Literals.XABSTRACT_WHILE_EXPRESSION__PREDICATE) == ValueTransient.YES)
			errorAcceptor.accept(diagnosticProvider.createFeatureValueMissing(semanticObject, XbasePackage.Literals.XABSTRACT_WHILE_EXPRESSION__PREDICATE));
		if (transientValues.isValueTransient(semanticObject, XbasePackage.Literals.XABSTRACT_WHILE_EXPRESSION__BODY) == ValueTransient.YES)
			errorAcceptor.accept(diagnosticProvider.createFeatureValueMissing(semanticObject, XbasePackage.Literals.XABSTRACT_WHILE_EXPRESSION__BODY));
	}
	SequenceFeeder feeder = createSequencerFeeder(context, semanticObject);
	feeder.accept(grammarAccess.getXWhileExpressionAccess().getPredicateXExpressionParserRuleCall_3_0(), semanticObject.getPredicate());
	feeder.accept(grammarAccess.getXWhileExpressionAccess().getBodyXExpressionParserRuleCall_5_0(), semanticObject.getBody());
	feeder.finish();
}