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The CodeNarc project provides a static analysis tool for Groovy code.

There is a newer version: 3.5.0-groovy-4.0

/*
 * Copyright 2011 the original author or authors.
 * 
 * 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 org.codenarc.rule.dry

import org.codehaus.groovy.ast.expr.ListExpression
import org.codenarc.rule.AbstractAstVisitor
import org.codenarc.rule.AbstractAstVisitorRule
import org.codenarc.util.AstUtil

/**
 * Check for multiple instances of the same List literal, limited to Lists where the
 * values are all constants or literals.
 *
 * @author Chris Mair
 */
class DuplicateListLiteralRule extends AbstractAstVisitorRule {
    String name = 'DuplicateListLiteral'
    int priority = 3
    String doNotApplyToFilesMatching = DEFAULT_TEST_FILES
    Class astVisitorClass = DuplicateListLiteralAstVisitor
}

class DuplicateListLiteralAstVisitor extends AbstractAstVisitor {

    private final Collection listLiterals = []

    @Override
    void visitListExpression(ListExpression expression) {
        if (expression.expressions.isEmpty()) {
            return
        }

        if(isFirstVisit(expression)) {
            if (AstUtil.isListLiteralWithOnlyConstantValues(expression)) {
                def isDuplicate = listLiterals.find { listLiteral -> DryUtil.areTheSameConstantOrLiteralLists(listLiteral, expression)  }

                if (isDuplicate) {
                    addViolation(expression, "List ${expression.text} is duplicated.")
                    return  // Ignore duplicate sub-Lists
                }
                listLiterals.add(expression)
            }
            super.visitListExpression(expression)
        }
    }

}