org.codehaus.groovy.transform.tailrec.TernaryToIfStatementConverter.groovy Maven / Gradle / Ivy

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/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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 org.codehaus.groovy.transform.tailrec

import groovy.transform.CompileStatic
import org.codehaus.groovy.ast.expr.TernaryExpression
import org.codehaus.groovy.ast.stmt.ReturnStatement
import org.codehaus.groovy.ast.stmt.Statement

import static org.codehaus.groovy.ast.tools.GeneralUtils.ifElseS
import static org.codehaus.groovy.ast.tools.GeneralUtils.returnS

/**
 * Since a ternary statement has more than one exit point tail-recursiveness testing cannot be easily done.
 * Therefore this class translates a ternary statement (or Elvis operator) into the equivalent if-else statement.
 */
@CompileStatic
class TernaryToIfStatementConverter {

    @SuppressWarnings('Instanceof')
    Statement convert(ReturnStatement statementWithInnerTernaryExpression) {
        if (!(statementWithInnerTernaryExpression.expression instanceof TernaryExpression))
            return statementWithInnerTernaryExpression
        TernaryExpression ternary = statementWithInnerTernaryExpression.expression as TernaryExpression
        ifElseS(ternary.booleanExpression, returnS(ternary.trueExpression), returnS(ternary.falseExpression))
    }
}