org.codenarc.rule.size.AbcComplexityRule.groovy Maven / Gradle / Ivy

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The CodeNarc project provides a static analysis tool for Groovy code.
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/*
 * Copyright 2010 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.size

import org.codenarc.rule.AbstractAstVisitorRule
import org.gmetrics.metric.abc.AbcMetric

/**
 * Rule that calculates the ABC Complexity for methods/classes and checks against
 * configured threshold values.
 * 
 * The maxMethodComplexity property holds the threshold value for the ABC complexity value
 * (magnitude) for each method. If this value is non-zero, a method with a cyclomatic complexity value greater than
 * this value is considered a violation. The value does not have to be an integer (i.e., 1.7 is allowed). The
 * maxMethodComplexity property defaults to 60.
 * 

 * The maxClassAverageMethodComplexity property holds the threshold value for the average ABC
 * complexity value for each class. If this value is non-zero, a class with an average ABC complexity
 * value greater than this value is considered a violation. The value does not have to be an integer
 * (i.e., 1.7 is allowed). The maxClassAverageMethodComplexity property defaults to 60.
 * 

 * The maxClassComplexity property holds the threshold value for the total ABC
 * complexity value for each class. If this value is non-zero, a class with a total ABC complexity
 * value greater than this value is considered a violation. The value does not have to be an integer
 * (i.e., 1.7 is allowed). The maxClassComplexity property defaults to 0.
 * 

 * The ignoreMethodNames property optionally specifies one or more (comma-separated) method
 * names that should be ignored (i.e., that should not cause a rule violation). The name(s) may optionally
 * include wildcard characters ('*' or '?'). Note that the ignored methods still contribute to the class
 * complexity value.
 * 
 * This rule treats "closure fields" as methods. If a class field is initialized to a Closure (ClosureExpression),
 * then that Closure is analyzed and checked just like a method.
 *
 * @see ABC Metric specification.
 * @see Blog post describing guidelines for interpreting an ABC score.
 * @see GMetrics ABC metric.
 *
 * @deprecated This rule is deprecated and disabled (enabled=false) by default. Use AbcMetric rule instead.
 *
 * @author Chris Mair
 */
class AbcComplexityRule extends AbstractAstVisitorRule {
    String name = 'AbcComplexity'
    int priority = 2
    Class astVisitorClass = AbcComplexityAstVisitor
    int maxMethodComplexity = 60
    int maxClassAverageMethodComplexity = 60
    int maxClassComplexity = 0
    String ignoreMethodNames

    AbcComplexityRule() {
        this.enabled = false        // deprecated; disabled by default
    }
}

class AbcComplexityAstVisitor extends AbstractMethodMetricAstVisitor  {

    final String metricShortDescription = 'ABC score'

    protected Object createMetric() {
        new AbcMetric()
    }

    protected Object getMaxMethodMetricValue() {
        rule.maxMethodComplexity
    }

    protected Object getMaxClassAverageMethodMetricValue() {
        rule.maxClassAverageMethodComplexity
    }

    protected Object getMaxClassMetricValue() {
        rule.maxClassComplexity
    }
}