/
UnaryOperationExpr.java
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/
UnaryOperationExpr.java
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// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.api.generator.engine.ast;
import com.google.auto.value.AutoValue;
import com.google.common.base.Preconditions;
@AutoValue
public abstract class UnaryOperationExpr implements OperationExpr {
public abstract Expr expr();
@Override
public abstract OperatorKind operatorKind();
@Override
public abstract TypeNode type();
@Override
public void accept(AstNodeVisitor visitor) {
visitor.visit(this);
}
public boolean isPostfixIncrement() {
return operatorKind().equals(OperatorKind.UNARY_POST_INCREMENT);
}
public static UnaryOperationExpr postfixIncrementWithExpr(Expr expr) {
return builder()
.setExpr(expr)
.setOperatorKind(OperatorKind.UNARY_POST_INCREMENT)
.setType(expr.type())
.build();
}
public static UnaryOperationExpr logicalNotWithExpr(Expr expr) {
return builder()
.setOperatorKind(OperatorKind.UNARY_LOGICAL_NOT)
.setExpr(expr)
.setType(TypeNode.BOOLEAN)
.build();
}
private static Builder builder() {
return new AutoValue_UnaryOperationExpr.Builder();
}
@AutoValue.Builder
abstract static class Builder {
// Private setter.
abstract Builder setExpr(Expr expr);
// Private setter.
abstract Builder setOperatorKind(OperatorKind operator);
// Private setter.
abstract Builder setType(TypeNode type);
abstract UnaryOperationExpr autoBuild();
private UnaryOperationExpr build() {
UnaryOperationExpr unaryOperationExpr = autoBuild();
TypeNode exprType = unaryOperationExpr.expr().type();
OperatorKind operator = unaryOperationExpr.operatorKind();
// Add final keyword checking for post/prefix ++, -- when needed.
if (operator.equals(OperatorKind.UNARY_POST_INCREMENT)
&& unaryOperationExpr.expr() instanceof VariableExpr) {
VariableExpr varExpr = (VariableExpr) unaryOperationExpr.expr();
Preconditions.checkState(
!varExpr.isFinal(),
String.format("Cannot increment the final variable '%s'.", varExpr.variable().name()));
Preconditions.checkState(
!varExpr.isDecl(),
String.format(
"Cannot increment the declaration of variable %s", varExpr.variable().name()));
}
final String errorMsg =
String.format(
"Unary operator %s can not be applied to %s. ", operator, exprType.toString());
Preconditions.checkState(
!exprType.equals(TypeNode.VOID) && !exprType.equals(TypeNode.NULL), errorMsg);
if (operator.equals(OperatorKind.UNARY_LOGICAL_NOT)) {
Preconditions.checkState(isValidLogicalNotType(exprType), errorMsg);
}
if (operator.equals(OperatorKind.UNARY_POST_INCREMENT)) {
Preconditions.checkState(isValidIncrementType(exprType), errorMsg);
}
return unaryOperationExpr;
}
}
private static boolean isValidLogicalNotType(TypeNode exprType) {
// Logical not (!) can only be applied on boolean/Boolean type
return exprType.equals(TypeNode.BOOLEAN);
}
private static boolean isValidIncrementType(TypeNode exprType) {
// Increment (++) can be applied on numeric types(int, double, float, long, short, char)
// and its boxed type (exclude Boolean)
return TypeNode.isNumericType(exprType);
}
}