creating astts the painful truth

… …

⇒1==1

⇒ ⇒ref.myMethod(3)

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if(booleanExpression){println"hello"//statement}

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publicvoidmain(String[]args){//blockstarts//thisisinsideablockstatement}//blockends

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publicStringgreetings(){return"HelloGreach"}

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classA{//ClassNodeStringgreetings//FieldNode

Stringhello(){//MethodNode

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classA{//ClassNode

Stringhello()//MethodNode{//blockStatement{

return"Hello"//returnStatement(constantExpression)

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packagegreach.local

classA{@WithLoggingvoiddoSomething(){//println"StartingdoSomething"

println"mystuff"

//println"EndingdoSomething"}}

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packagegreach.local

importorg.codehaus.groovy.transform.GroovyASTTransformationClassimportjava.lang.annotation.*

(1)@Retention(RetentionPolicy.SOURCE)@Target([ElementType.METHOD])(2)@GroovyASTTransformationClass(["greach.local.WithLoggingExplainedTransformation"])@interfaceWithLoggingExplained{}

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importorg.codehaus.groovy.ast.expr.*

importorg.codehaus.groovy.ast.stmt.*

importorg.codehaus.groovy.ast.*

importorg.codehaus.groovy.transform.*

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@GroovyASTTransformation(phase=CompilePhase.SEMANTIC_ANALYSIS)classWithLoggingExplainedTransformationimplementsASTTransformation{

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@Overridevoidvisit(ASTNode[]nodes,SourceUnitsourceUnit){MethodNodemethod=(MethodNode)nodes[1](1)

defstartMessage=createPrintlnAst("Starting$method.name")defendMessage=createPrintlnAst("Ending$method.name")

defexistingStatements=((BlockStatement)method.code).statements(2)existingStatements.add(0,startMessage)existingStatements.add(endMessage)

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privatestaticStatementcreatePrintlnAst(Stringmessage){newExpressionStatement(newMethodCallExpression(newVariableExpression("this"),newConstantExpression("println"),newArgumentListExpression(newConstantExpression(message))))}

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importstaticorg.codehaus.groovy.ast.tools.GeneralUtils.*

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privatestaticStatementcreatePrintlnAst(Stringmessage){returnstmt(callThisX("println",args(constX(message))))}

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privatestaticStatementcreatePrintlnAst(Stringmessage){returnstmt(callThisX("println",args(constX(message))))}

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BlockStatementgetBlockStmt(){ASTNode[]stmts=newAstBuilder().buildFromCode{returnnumber%2==0}

returnstmts.first()asBlockStatement}

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BlockStatementgetMD5Code(finalStringpropertyName){defblockStatement=newAstBuilder().buildFromString"""java.security.MessageDigest.getInstance('MD5').digest(${propertyName}.getBytes('UTF-8')).encodeHex().toString()"""

returnblockStatement.first()asBlockStatement}

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@GroovyASTTransformation(phase=CompilePhase.INSTRUCTION_SELECTION)classPlayAstextendsExceptionFriendlyAst{

staticfinalPLAY_METHOD_NAME="play"staticfinalPLAY_METHOD_PARAM_NAME="params"

/*WeneedtoinjectaDataFlowsinstanceinavariablecalled"flow"*/voidprocessNodes(ASTNode[]astNodes,SourceUnitsourceUnit){/*Checkingconstraints*/if(!astNodes)returnif(!astNodes[0]||!astNodes[1])returnif(!(astNodes[0]instanceofAnnotationNode))returnif(astNodes[0].classNode?.name!=Play.class.name)returnif(!(astNodes[1]instanceofMethodNode))return

13 . 2

……

packagegreach.builder

classOrder{@ToMD5Stringname@ToMD5Stringdescription}

Orderorder=newOrder(name:"john",description:"desc")

assertorder.nameToMD5()=="527bd5b5d689e2c32ae974c6229ff785"assertorder.descriptionToMD5()=="1dee80c7d5ab2c1c90aa8d2f7dd47256"

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@CompileStatic@LocalTransformation(A.PHASE_LOCAL.INSTRUCTION_SELECTION)classToMD5ImplextendsLocalTransformationImpl<ToMD5,FieldNode>{

@OverridevoiddoVisit(AnnotationNodeannotation,FieldNodefieldNode,SourceUnitsourceUnit){MethodNodemd5Method=getMD5Method(fieldNode.name)

fieldNode.declaringClass.addMethod(md5Method)}

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@GroovyASTTransformation(phase=CompilePhase.CANONICALIZATION)classMacroExpandAstextendsAbstractASTTransformation{

voidvisit(ASTNode[]nodes,SourceUnitsourceUnit){sourceUnit.AST.classes.each{ClassNodeclassNode->newMacroExpandTransformer().visitClass(classNode)}}

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classMacroExpandTransformerextendsClassCodeExpressionTransformer{

privateSourceUnitsourceUnit

MacroExpandTransformer(SourceUnitsourceUnit){//PASSINGSOURCEUNITthis.sourceUnit=sourceUnit}

publicExpressiontransform(Expressionexpression){//CHECKINGAGAINif(expressioninstanceofMethodCallExpression&&expression.methodAsString=='let'){//CASTINGSMethodCallExpressionmethodCallExpression=(MethodCallExpression)expression

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@GlobalTransformation(A.PHASE_GLOBAL.SEMANTIC)classAddTransformationextendsGlobalTransformationImpl{

List<Class<Transformer>>getTransformers(){return[AddPropertyTransformer,AddMethodTransformer]}}

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classChangeTripleXToPlusOneextendsExpressionTransformer<MethodCallExpression>{

ChangeTripleXToPlusOne(finalSourceUnitsourceUnit){super(sourceUnit,methodCallByNameEq('xxx'))}

ExpressiontransformExpression(finalMethodCallExpressiontarget){returnA.EXPR.constX(1)}}

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importorg.codehaus.groovy.transform.GroovyASTTransformationClass

importjava.lang.annotation.ElementTypeimportjava.lang.annotation.Retentionimportjava.lang.annotation.RetentionPolicyimportjava.lang.annotation.Target

@Retention(RetentionPolicy.SOURCE)@Target([ElementType.TYPE])@GroovyASTTransformationClass(["greach.builder.EvenCheckerImpl"])@interfaceEvenCheckerJava{}

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importasteroid.local.Local

@Local(EvenCheckerImpl)@interfaceEvenChecker{}

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packagegreach.meta

importgroovy.transform.ToStringimportgroovy.transform.AnnotationCollector

@ToJson@ToString@AnnotationCollector@interfaceToEverything{}

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packagegreach.meta

@ToEverythingclassA{Stringname}

AaInstance=newA()

assertaInstance.toJson()assertaInstance.toString()

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packagegreach.meta

AaInstance=newA()

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packagegreach.meta

AaInstance=newA()

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@CompileStatic@LocalTransformation(A.PHASE_LOCAL.INSTRUCTION_SELECTION)classSerializableImplextendsLocalTransformationImpl<Serializable,ClassNode>{@OverridevoiddoVisit(AnnotationNodeannotation,ClassNodeclassNode,SourceUnitsource){check:'packagestartswithasteroid'classNode.packageName.startsWith('asteroid')

check:'thereareatmost2methods'classNode.methods.size()<3

then:'makeitimplementsSerializableandCloneable'addInterfaces(classNode,java.io.Serializable,Cloneable)}}

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@ASTTest({assertnode.properties.every{it.type==ClassHelper.make(Integer)}})@EvenCheckerclassA{IntegermaxIntegermin

StringtoString(){return"A"}}

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classToMD5TestextendsGroovyTestCase{

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voidtestAddingToMD5(){assertScript'''packagegreach.builder

classOrder{@ToMD5Stringname@ToMD5Stringdescription}

Orderorder=newOrder(name:"john",description:"desc")

assertorder.nameToMD5()=="527bd5b5d689e2c32ae974c6229ff785"assertorder.descriptionToMD5()=="1dee80c7d5ab2c1c90aa8d2f7dd47256"'''}

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voidtestFailsToUseAnInteger(){shouldFail'''packagegreach.builder

classOrder{@ToMD5Integermonth}'''}

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BlockStatementresult=macro(true){println"foo"}

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defexpected=block(stmt(callThisX("println",args(constX("foo")))))

//CHECKEDBYAstAssert.assertSyntaxTree([expected],[result]);

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voidtestClosureExpression(){defast1=macro{{->a}}defast2=macro{{->a}}defast3=macro{{->b}}defast4=macro{{a->a}}defast5=macro{{a->a}}defast6=macro{{a,b->a}}defast7=macro{{inta->a}}assertASTMatcher.matches(ast1,ast1)assertASTMatcher.matches(ast1,ast2)assertASTMatcher.matches(ast2,ast1)assert!ASTMatcher.matches(ast1,ast3)assert!ASTMatcher.matches(ast1,ast4)assertASTMatcher.matches(ast4,ast5)assert!ASTMatcher.matches(ast5,ast6)assert!ASTMatcher.matches(ast5,ast7)}

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