Github user bsideup commented on a diff in the pull request:
https://github.com/apache/groovy/pull/439#discussion_r82380664
--- 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 --
can be replaced with
`getTemplateClass(sumExpression).getDeclaredMethods('giveMeTwo').first()`
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