/
ArithmeticOperationExpr.java
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/
ArithmeticOperationExpr.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 ArithmeticOperationExpr implements OperationExpr {
public abstract Expr lhsExpr();
public abstract Expr rhsExpr();
@Override
public abstract OperatorKind operatorKind();
@Override
public abstract TypeNode type();
@Override
public void accept(AstNodeVisitor visitor) {
visitor.visit(this);
}
public static ArithmeticOperationExpr concatWithExprs(Expr lhsExpr, Expr rhsExpr) {
return builder()
.setLhsExpr(lhsExpr)
.setRhsExpr(rhsExpr)
.setOperatorKind(OperatorKind.ARITHMETIC_ADDITION)
.setType(TypeNode.STRING)
.build();
}
private static Builder builder() {
return new AutoValue_ArithmeticOperationExpr.Builder();
}
@AutoValue.Builder
abstract static class Builder {
// Private setter.
abstract Builder setLhsExpr(Expr expr);
// Private setter.
abstract Builder setRhsExpr(Expr expr);
// Private setter.
abstract Builder setOperatorKind(OperatorKind operator);
// Private setter.
abstract Builder setType(TypeNode type);
abstract ArithmeticOperationExpr autoBuild();
private ArithmeticOperationExpr build() {
ArithmeticOperationExpr arithmeticOperationExpr = autoBuild();
TypeNode lhsExprType = arithmeticOperationExpr.lhsExpr().type();
TypeNode rhsExprType = arithmeticOperationExpr.rhsExpr().type();
OperatorKind operator = arithmeticOperationExpr.operatorKind();
final String errorMsg =
String.format(
"Arithmetic operator %s can not be applied to %s, %s.",
operator, lhsExprType.toString(), rhsExprType.toString());
// None of expression should be void type.
Preconditions.checkState(
!lhsExprType.equals(TypeNode.VOID) && !rhsExprType.equals(TypeNode.VOID), errorMsg);
// Type-checking for Concat operator.
if (operator.equals(OperatorKind.ARITHMETIC_ADDITION)) {
Preconditions.checkState(isValidConcatTypes(lhsExprType, rhsExprType), errorMsg);
}
return arithmeticOperationExpr;
}
private boolean isValidConcatTypes(TypeNode lhsType, TypeNode rhsType) {
// concat requires at least one String-typed expression
return lhsType.equals(TypeNode.STRING) || rhsType.equals(TypeNode.STRING);
}
}
}