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From: mariogarcia <git@git.apache.org>
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Subject: [GitHub] groovy pull request #439: WIP Add groovy-macro docs
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Message-Id: <20161008133149.1E1B0E0209@git1-us-west.apache.org>
Date: Sat,  8 Oct 2016 13:31:49 +0000 (UTC)
archived-at: Sat, 08 Oct 2016 13:31:51 -0000

Github user mariogarcia commented on a diff in the pull request:

    https://github.com/apache/groovy/pull/439#discussion_r82502595
  
    --- Diff: src/spec/test/metaprogramming/ASTMatcherTestingTest.groovy ---
    @@ -0,0 +1,123 @@
    +/*
    + *  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 metaprogramming
    +
    +import groovy.transform.CompileDynamic
    +import groovy.transform.CompileStatic
    +import org.codehaus.groovy.ast.ASTNode
    +import org.codehaus.groovy.ast.ClassNode
    +import org.codehaus.groovy.ast.MethodNode
    +import org.codehaus.groovy.ast.Parameter
    +import org.codehaus.groovy.ast.expr.BinaryExpression
    +import org.codehaus.groovy.ast.expr.Expression
    +import org.codehaus.groovy.ast.stmt.BlockStatement
    +import org.codehaus.groovy.control.CompilePhase
    +import org.codehaus.groovy.control.SourceUnit
    +import org.codehaus.groovy.macro.matcher.ASTMatcher
    +import org.codehaus.groovy.macro.transform.MacroClass
    +import org.codehaus.groovy.transform.AbstractASTTransformation
    +import org.codehaus.groovy.transform.GroovyASTTransformation
    +import org.codehaus.groovy.transform.GroovyASTTransformationClass
    +
    +import java.lang.annotation.ElementType
    +import java.lang.annotation.Retention
    +import java.lang.annotation.RetentionPolicy
    +import java.lang.annotation.Target
    +
    +import static org.codehaus.groovy.ast.ClassHelper.Integer_TYPE
    +import static org.codehaus.groovy.ast.tools.GeneralUtils.*
    +
    +/**
    + * Created by dev on 6/30/16.
    + */
    +class ASTMatcherTestingTest extends GroovyTestCase {
    +
    +    // tag::testexpression[]
    +    void testTestingSumExpression() {
    +        use(ASTMatcher) {                 // <1>
    +            TwiceASTTransformation sample = new TwiceASTTransformation()
    +            Expression referenceNode = macro {
    +                a + a                     // <2>
    +            }.withConstraints {           // <3>
    +                placeholder 'a'           // <4>
    +            }
    +
    +            assert sample
    +                .sumExpression
    +                .matches(referenceNode)   // <5>
    +        }
    +    }
    +    // end::testexpression[]
    +
    +    // tag::executiontesting[]
    +    void testASTBehavior() {
    +        assertScript '''
    +        package metaprogramming
    +
    +        @Twice
    +        class AAA {
    +
    +        }
    +
    +        assert new AAA().giveMeTwo(1) == 2
    +        '''
    +    }
    +    // end::executiontesting[]
    +}
    +
    +@Retention(RetentionPolicy.SOURCE)
    +@Target([ElementType.TYPE])
    +@GroovyASTTransformationClass(["metaprogramming.TwiceASTTransformation"])
    +@interface Twice { }
    +
    +// tag::twiceasttransformation[]
    +@GroovyASTTransformation(phase = CompilePhase.INSTRUCTION_SELECTION)
    +class TwiceASTTransformation extends AbstractASTTransformation {
    +
    +    static final String VAR_X = 'x'
    +
    +    @Override
    +    void visit(ASTNode[] nodes, SourceUnit source) {
    +        ClassNode classNode = (ClassNode) nodes[1]
    +        MethodNode giveMeTwo = getTemplateClass(sumExpression)
    +            .methods
    +            .find { it.name == 'giveMeTwo' }
    --- End diff --
    
    :+1: 


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