groovy.inspect.swingui.AstNodeToScriptAdapter.groovy Maven / Gradle / Ivy
/*
* Copyright 2003-2012 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 groovy.inspect.swingui
import org.codehaus.groovy.ast.*
import org.codehaus.groovy.ast.expr.*
import org.codehaus.groovy.ast.stmt.*
import org.codehaus.groovy.classgen.BytecodeExpression
import org.codehaus.groovy.control.CompilePhase
import java.lang.reflect.Modifier
import org.codehaus.groovy.control.CompilationUnit
import org.codehaus.groovy.control.CompilerConfiguration
import org.codehaus.groovy.control.CompilationFailedException
import org.codehaus.groovy.classgen.GeneratorContext
import org.codehaus.groovy.control.SourceUnit
import org.codehaus.groovy.control.CompilationUnit.PrimaryClassNodeOperation
import org.codehaus.groovy.classgen.Verifier
/**
* This class takes Groovy source code, compiles it to a specific compile phase, and then decompiles it
* back to the groovy source. It is used by GroovyConsole's AST Browser, but can also be invoked from
* the command line.
*
* @author Hamlet D'Arcy
*/
public class AstNodeToScriptAdapter {
/**
* Run this class as a script to compile a groovy file and print out the resulting source.
* @param args
* a filename to compile and a CompilePhase to run to
*/
public static void main(args) {
if (!args || args.length < 2) {
println """
Usage: java groovy.inspect.swingui.AstNodeToScriptAdapter [filename] [compilephase]
where [filename] is a Groovy script
and [compilephase] is a valid Integer based org.codehaus.groovy.control.CompilePhase"""
} else {
def file = new File((String) args[0])
def phase = CompilePhase.fromPhaseNumber(args[1] as int)
if (!file.exists()) {
println "File ${args[0]} cannot be found."
} else if (phase == null) {
println "Compile phase ${args[1]} cannot be mapped to a org.codehaus.groovy.control.CompilePhase."
} else {
println new AstNodeToScriptAdapter().compileToScript(file.text, phase.getPhaseNumber())
}
}
}
/**
* This method takes source code, compiles it, then reverses it back to source.
* @param script
* the source code to be compiled. If invalid, a compile error occurs
* @param compilePhase
* the CompilePhase. Must be an int mapped in @{link CompilePhase}
* @param classLoader
* (optional) the classloader to use. If missing/null then the current is used.
* This parameter enables things like ASTBrowser to invoke this with the correct classpath
* @param showScriptFreeForm
* Whether or not to show the script portion of the source code
* @param showScriptClass
* Whether or not to show the Script class from the source code
* @returns the source code from the AST state
*/
public String compileToScript(String script, int compilePhase, ClassLoader classLoader = null, boolean showScriptFreeForm = true, boolean showScriptClass = true) {
def writer = new StringWriter()
classLoader = classLoader ?: new GroovyClassLoader(getClass().classLoader)
def scriptName = "script" + System.currentTimeMillis() + ".groovy"
GroovyCodeSource codeSource = new GroovyCodeSource(script, scriptName, "/groovy/script")
CompilationUnit cu = new CompilationUnit(CompilerConfiguration.DEFAULT, codeSource.codeSource, classLoader)
cu.addPhaseOperation(new AstNodeToScriptVisitor(writer, showScriptFreeForm, showScriptClass), compilePhase)
cu.addSource(codeSource.getName(), script);
try {
cu.compile(compilePhase)
} catch (CompilationFailedException cfe) {
writer.println "Unable to produce AST for this phase due to earlier compilation error:"
cfe.message.eachLine {
writer.println it
}
writer.println "Fix the above error(s) and then press Refresh"
} catch (Throwable t) {
writer.println "Unable to produce AST for this phase due to an error:"
writer.println t.getMessage()
writer.println "Fix the above error(s) and then press Refresh"
}
return writer.toString()
}
}
/**
* An adapter from ASTNode tree to source code.
*
* @author Hamlet D'Arcy
*/
class AstNodeToScriptVisitor extends PrimaryClassNodeOperation implements GroovyCodeVisitor, GroovyClassVisitor {
private Writer _out
Stack classNameStack = new Stack();
String _indent = ""
boolean readyToIndent = true
boolean showScriptFreeForm
boolean showScriptClass
boolean scriptHasBeenVisited
def AstNodeToScriptVisitor(Writer writer, boolean showScriptFreeForm = true, boolean showScriptClass = true) {
this._out = writer;
this.showScriptFreeForm = showScriptFreeForm
this.showScriptClass = showScriptClass
this.scriptHasBeenVisited = false
}
void call(SourceUnit source, GeneratorContext context, ClassNode classNode) {
visitPackage(source?.getAST()?.getPackage())
visitAllImports(source)
if (showScriptFreeForm && !scriptHasBeenVisited) {
scriptHasBeenVisited = true
source?.getAST()?.getStatementBlock()?.visit(this)
}
if (showScriptClass || !classNode.isScript()) {
visitClass classNode
}
}
private def visitAllImports(SourceUnit source) {
boolean staticImportsPresent = false
boolean importsPresent = false
source?.getAST()?.getStaticImports()?.values()?.each {
visitImport(it)
staticImportsPresent = true
}
source?.getAST()?.getStaticStarImports()?.values()?.each {
visitImport(it)
staticImportsPresent = true
}
if (staticImportsPresent) {
printDoubleBreak()
}
source?.getAST()?.getImports()?.each {
visitImport(it)
importsPresent = true
}
source?.getAST()?.getStarImports()?.each {
visitImport(it)
importsPresent = true
}
if (importsPresent) {
printDoubleBreak()
}
}
void print(parameter) {
def output = parameter.toString()
if (readyToIndent) {
_out.print _indent
readyToIndent = false
while (output.startsWith(' ')) {
output = output[1..-1] // trim left
}
}
if (_out.toString().endsWith(' ')) {
if (output.startsWith(' ')) {
output = output[1..-1]
}
}
_out.print output
}
def println(parameter) {
throw new UnsupportedOperationException('Wrong API')
}
def indented(Closure block) {
String startingIndent = _indent
_indent = _indent + " "
block()
_indent = startingIndent
}
def printLineBreak() {
if (!_out.toString().endsWith('\n')) {
_out.print '\n'
}
readyToIndent = true
}
def printDoubleBreak() {
if (_out.toString().endsWith('\n\n')) {
// do nothing
} else if (_out.toString().endsWith('\n')) {
_out.print '\n'
} else {
_out.print '\n'
_out.print '\n'
}
readyToIndent = true
}
void visitPackage(PackageNode packageNode) {
if (packageNode) {
packageNode.annotations?.each {
visitAnnotationNode(it)
printLineBreak()
}
if (packageNode.text.endsWith(".")) {
print packageNode.text[0..-2]
} else {
print packageNode.text
}
printDoubleBreak()
}
}
void visitImport(ImportNode node) {
if (node) {
node.annotations?.each {
visitAnnotationNode(it)
printLineBreak()
}
print node.text
printLineBreak()
}
}
@Override
public void visitClass(ClassNode node) {
classNameStack.push(node.name)
node?.annotations?.each {
visitAnnotationNode(it)
printLineBreak()
}
visitModifiers(node.modifiers)
print "class $node.name"
visitGenerics node?.genericsTypes
boolean first = true
node.interfaces?.each {
if (!first) {
print ', '
} else {
print ' implements '
}
first = false
visitType it
}
print ' extends '
visitType node.superClass
print " { "
printDoubleBreak()
indented {
node?.properties?.each { visitProperty(it) }
printLineBreak()
node?.fields?.each { visitField(it) }
printDoubleBreak()
node?.declaredConstructors?.each { visitConstructor(it) }
printLineBreak()
node?.methods?.each { visitMethod(it) }
}
print '}'
printLineBreak()
classNameStack.pop()
}
private void visitGenerics(GenericsType[] generics) {
if (generics) {
print '<'
boolean first = true
generics.each { GenericsType it ->
if (!first) {
print ', '
}
first = false
print it.name
if (it.upperBounds) {
print ' extends '
boolean innerFirst = true
it.upperBounds.each { ClassNode upperBound ->
if (!innerFirst) {
print ' & '
}
innerFirst = false
visitType upperBound
}
}
if (it.lowerBound) {
print ' super '
visitType it.lowerBound
}
}
print '>'
}
}
@Override
public void visitConstructor(ConstructorNode node) {
visitMethod(node)
}
private String visitParameters(parameters) {
boolean first = true
parameters.each { Parameter it ->
if (!first) {
print ', '
}
first = false
it.annotations?.each {
visitAnnotationNode(it)
print(' ')
}
visitModifiers(it.modifiers)
visitType it.type
print ' ' + it.name
if (it.initialExpression && !(it.initialExpression instanceof EmptyExpression)) {
print ' = '
it.initialExpression.visit this
}
}
}
@Override
public void visitMethod(MethodNode node) {
node?.annotations?.each {
visitAnnotationNode(it)
printLineBreak()
}
visitModifiers(node.modifiers)
if (node.name == '') {
print "${classNameStack.peek()}("
visitParameters(node.parameters)
print ") {"
printLineBreak()
} else if (node.name == '') {
print '{ ' // will already have 'static' from modifiers
printLineBreak()
} else {
visitType node.returnType
print " $node.name("
visitParameters(node.parameters)
print ")"
if (node.exceptions) {
boolean first = true
print ' throws '
node.exceptions.each {
if (!first) {
print ', '
}
first = false
visitType it
}
}
print " {"
printLineBreak()
}
indented {
node?.code?.visit(this)
}
printLineBreak()
print '}'
printDoubleBreak()
}
private def visitModifiers(int modifiers) {
if (Modifier.isAbstract(modifiers)) {
print 'abstract '
}
if (Modifier.isFinal(modifiers)) {
print 'final '
}
if (Modifier.isInterface(modifiers)) {
print 'interface '
}
if (Modifier.isNative(modifiers)) {
print 'native '
}
if (Modifier.isPrivate(modifiers)) {
print 'private '
}
if (Modifier.isProtected(modifiers)) {
print 'protected '
}
if (Modifier.isPublic(modifiers)) {
print 'public '
}
if (Modifier.isStatic(modifiers)) {
print 'static '
}
if (Modifier.isSynchronized(modifiers)) {
print 'synchronized '
}
if (Modifier.isTransient(modifiers)) {
print 'transient '
}
if (Modifier.isVolatile(modifiers)) {
print 'volatile '
}
}
@Override
public void visitField(FieldNode node) {
node?.annotations?.each {
visitAnnotationNode(it)
printLineBreak()
}
visitModifiers(node.modifiers)
visitType node.type
print " $node.name "
// do not print initial expression, as this is executed as part of the constructor, unless on static constant
Expression exp = node.initialValueExpression
if (exp instanceof ConstantExpression) exp = Verifier.transformToPrimitiveConstantIfPossible(exp)
ClassNode type = exp?.type
if (Modifier.isStatic(node.modifiers) && Modifier.isFinal(node.getModifiers())
&& exp instanceof ConstantExpression
&& type == node.type
&& ClassHelper.isStaticConstantInitializerType(type)) {
// GROOVY-5150: final constants may be initialized directly
print " = "
if (ClassHelper.STRING_TYPE == type) {
print "'"+node.initialValueExpression.text.replaceAll("'", "\\\\'")+"'"
} else if (ClassHelper.char_TYPE == type) {
print "'${node.initialValueExpression.text}'"
} else {
print node.initialValueExpression.text
}
}
printLineBreak()
}
public void visitAnnotationNode(AnnotationNode node) {
print '@' + node?.classNode?.name
if (node?.members) {
print '('
boolean first = true
node.members.each { String name, Expression value ->
if (first) {
first = false
} else {
print ', '
}
print name + ' = '
value.visit(this)
}
print ')'
}
}
@Override
public void visitProperty(PropertyNode node) {
// is a FieldNode, avoid double dispatch
}
@Override
public void visitBlockStatement(BlockStatement block) {
block?.statements?.each {
it.visit(this);
printLineBreak()
}
if (!_out.toString().endsWith('\n')) {
printLineBreak()
}
}
@Override
public void visitForLoop(ForStatement statement) {
print 'for ('
if (statement?.variable != ForStatement.FOR_LOOP_DUMMY) {
visitParameters([statement.variable])
print ' : '
}
if (statement?.collectionExpression instanceof ListExpression) {
statement?.collectionExpression?.visit this
} else {
statement?.collectionExpression?.visit this
}
print ') {'
printLineBreak()
indented {
statement?.loopBlock?.visit this
}
print '}'
printLineBreak()
}
@Override
public void visitIfElse(IfStatement ifElse) {
print 'if ('
ifElse?.booleanExpression?.visit this
print ') {'
printLineBreak()
indented {
ifElse?.ifBlock?.visit this
}
printLineBreak()
if (ifElse?.elseBlock && !(ifElse.elseBlock instanceof EmptyStatement)) {
print "} else {"
printLineBreak()
indented {
ifElse?.elseBlock?.visit this
}
printLineBreak()
}
print '}'
printLineBreak()
}
@Override
public void visitExpressionStatement(ExpressionStatement statement) {
statement.expression.visit this
}
@Override
public void visitReturnStatement(ReturnStatement statement) {
printLineBreak()
print "return "
statement.getExpression().visit(this);
printLineBreak()
}
@Override
public void visitSwitch(SwitchStatement statement) {
print 'switch ('
statement?.expression?.visit this
print ') {'
printLineBreak()
indented {
statement?.caseStatements?.each {
visitCaseStatement it
}
if (statement?.defaultStatement) {
print 'default: '
printLineBreak()
statement?.defaultStatement?.visit this
}
}
print '}'
printLineBreak()
}
@Override
public void visitCaseStatement(CaseStatement statement) {
print 'case '
statement?.expression?.visit this
print ':'
printLineBreak()
indented {
statement?.code?.visit this
}
}
@Override
public void visitBreakStatement(BreakStatement statement) {
print 'break'
printLineBreak()
}
@Override
public void visitContinueStatement(ContinueStatement statement) {
print 'continue'
printLineBreak()
}
@Override
public void visitMethodCallExpression(MethodCallExpression expression) {
Expression objectExp = expression.getObjectExpression()
if (objectExp instanceof VariableExpression) {
visitVariableExpression(objectExp, false)
} else {
objectExp.visit(this);
}
if (expression.spreadSafe) {
print '*'
}
if (expression.safe) {
print '?'
}
print '.'
Expression method = expression.getMethod()
if (method instanceof ConstantExpression) {
visitConstantExpression(method, true)
} else {
method.visit(this);
}
expression.getArguments().visit(this)
}
@Override
public void visitStaticMethodCallExpression(StaticMethodCallExpression expression) {
print expression?.ownerType?.name + "." + expression?.method
if (expression?.arguments instanceof VariableExpression || expression?.arguments instanceof MethodCallExpression) {
print '('
expression?.arguments?.visit this
print ')'
} else {
expression?.arguments?.visit this
}
}
@Override
public void visitConstructorCallExpression(ConstructorCallExpression expression) {
if (expression?.isSuperCall()) {
print 'super'
} else if (expression?.isThisCall()) {
print 'this '
} else {
print 'new '
visitType expression?.type
}
expression?.arguments?.visit this
}
@Override
public void visitBinaryExpression(BinaryExpression expression) {
expression?.leftExpression?.visit this
print " $expression.operation.text "
expression.rightExpression.visit this
if (expression?.operation?.text == '[') {
print ']'
}
}
@Override
public void visitPostfixExpression(PostfixExpression expression) {
print '('
expression?.expression?.visit this
print ')'
print expression?.operation?.text
}
@Override
public void visitPrefixExpression(PrefixExpression expression) {
print expression?.operation?.text
print '('
expression?.expression?.visit this
print ')'
}
@Override
public void visitClosureExpression(ClosureExpression expression) {
print '{ '
if (expression?.parameters) {
visitParameters(expression?.parameters)
print ' ->'
}
printLineBreak()
indented {
expression?.code?.visit this
}
print '}'
}
@Override
public void visitTupleExpression(TupleExpression expression) {
print '('
visitExpressionsAndCommaSeparate(expression?.expressions)
print ')'
}
@Override
public void visitRangeExpression(RangeExpression expression) {
print '('
expression?.from?.visit this
print '..'
expression?.to?.visit this
print ')'
}
@Override
public void visitPropertyExpression(PropertyExpression expression) {
expression?.objectExpression?.visit this
if (expression?.spreadSafe) {
print '*'
} else if (expression?.isSafe()) {
print '?'
}
print '.'
if (expression?.property instanceof ConstantExpression) {
visitConstantExpression(expression?.property, true)
} else {
expression?.property?.visit this
}
}
@Override
public void visitAttributeExpression(AttributeExpression attributeExpression) {
visitPropertyExpression attributeExpression
}
@Override
public void visitFieldExpression(FieldExpression expression) {
print expression?.field?.name
}
@Override
public void visitConstantExpression(ConstantExpression expression, boolean unwrapQuotes = false) {
if (expression.value instanceof String && !unwrapQuotes) {
// string reverse escaping is very naive
def escaped = ((String) expression.value).replaceAll('\n', '\\\\n').replaceAll("'", "\\\\'")
print "'$escaped'"
} else {
print expression.value
}
}
@Override
public void visitClassExpression(ClassExpression expression) {
print expression.text
}
@Override
public void visitVariableExpression(VariableExpression expression, boolean spacePad = true) {
if (spacePad) {
print ' ' + expression.name + ' '
} else {
print expression.name
}
}
@Override
public void visitDeclarationExpression(DeclarationExpression expression) {
// handle multiple assignment expressions
if (expression?.leftExpression instanceof ArgumentListExpression) {
print 'def '
visitArgumentlistExpression expression?.leftExpression, true
print " $expression.operation.text "
expression.rightExpression.visit this
if (expression?.operation?.text == '[') {
print ']'
}
} else {
visitType expression?.leftExpression?.type
visitBinaryExpression expression // is a BinaryExpression
}
}
@Override
public void visitGStringExpression(GStringExpression expression) {
print '"' + expression.text + '"'
}
@Override
public void visitSpreadExpression(SpreadExpression expression) {
print '*'
expression?.expression?.visit this
}
@Override
public void visitNotExpression(NotExpression expression) {
print '!('
expression?.expression?.visit this
print ')'
}
@Override
public void visitUnaryMinusExpression(UnaryMinusExpression expression) {
print '-('
expression?.expression?.visit this
print ')'
}
@Override
public void visitUnaryPlusExpression(UnaryPlusExpression expression) {
print '+('
expression?.expression?.visit this
print ')'
}
@Override
public void visitCastExpression(CastExpression expression) {
print '(('
expression?.expression?.visit this
print ') as '
visitType(expression?.type)
print ')'
}
/**
* Prints out the type, safely handling arrays.
* @param classNode
* classnode
*/
public void visitType(ClassNode classNode) {
def name = classNode.name
if (name =~ /^\[+L/ && name.endsWith(";")) {
int numDimensions = name.indexOf('L')
print "${classNode.name[(numDimensions + 1)..-2]}" + ('[]' * numDimensions)
} else {
print name
}
visitGenerics classNode?.genericsTypes
}
@Override
public void visitArgumentlistExpression(ArgumentListExpression expression, boolean showTypes = false) {
print '('
int count = expression?.expressions?.size()
expression.expressions.each {
if (showTypes) {
visitType it.type
print ' '
}
if (it instanceof VariableExpression) {
visitVariableExpression it, false
} else if (it instanceof ConstantExpression) {
visitConstantExpression it, false
} else {
it.visit this
}
count--
if (count) print ', '
}
print ')'
}
@Override
public void visitBytecodeExpression(BytecodeExpression expression) {
print "/*BytecodeExpression*/"
printLineBreak()
}
@Override
public void visitMapExpression(MapExpression expression) {
print '['
if (expression?.mapEntryExpressions?.size() == 0) {
print ':'
} else {
visitExpressionsAndCommaSeparate(expression?.mapEntryExpressions)
}
print ']'
}
@Override
public void visitMapEntryExpression(MapEntryExpression expression) {
if (expression?.keyExpression instanceof SpreadMapExpression) {
print '*' // is this correct?
} else {
expression?.keyExpression?.visit this
}
print ': '
expression?.valueExpression?.visit this
}
@Override
public void visitListExpression(ListExpression expression) {
print '['
visitExpressionsAndCommaSeparate(expression?.expressions)
print ']'
}
@Override
public void visitTryCatchFinally(TryCatchStatement statement) {
print 'try {'
printLineBreak()
indented {
statement?.tryStatement?.visit this
}
printLineBreak()
print '} '
printLineBreak()
statement?.catchStatements?.each { CatchStatement catchStatement ->
visitCatchStatement(catchStatement)
}
print 'finally { '
printLineBreak()
indented {
statement?.finallyStatement?.visit this
}
print '} '
printLineBreak()
}
@Override
public void visitThrowStatement(ThrowStatement statement) {
print 'throw '
statement?.expression?.visit this
printLineBreak()
}
@Override
public void visitSynchronizedStatement(SynchronizedStatement statement) {
print 'synchronized ('
statement?.expression?.visit this
print ') {'
printLineBreak()
indented {
statement?.code?.visit this
}
print '}'
}
@Override
public void visitTernaryExpression(TernaryExpression expression) {
expression?.booleanExpression?.visit this
print ' ? '
expression?.trueExpression?.visit this
print ' : '
expression?.falseExpression?.visit this
}
@Override
public void visitShortTernaryExpression(ElvisOperatorExpression expression) {
visitTernaryExpression(expression)
}
@Override
public void visitBooleanExpression(BooleanExpression expression) {
expression?.expression?.visit this
}
@Override
public void visitWhileLoop(WhileStatement statement) {
print 'while ('
statement?.booleanExpression?.visit this
print ') {'
printLineBreak()
indented {
statement?.loopBlock?.visit this
}
printLineBreak()
print '}'
printLineBreak()
}
@Override
public void visitDoWhileLoop(DoWhileStatement statement) {
print 'do {'
printLineBreak()
indented {
statement?.loopBlock?.visit this
}
print '} while ('
statement?.booleanExpression?.visit this
print ')'
printLineBreak()
}
@Override
public void visitCatchStatement(CatchStatement statement) {
print 'catch ('
visitParameters([statement.variable])
print ') {'
printLineBreak()
indented {
statement.code?.visit this
}
print '} '
printLineBreak()
}
@Override
public void visitBitwiseNegationExpression(BitwiseNegationExpression expression) {
print '~('
expression?.expression?.visit this
print ') '
}
@Override
public void visitAssertStatement(AssertStatement statement) {
print 'assert '
statement?.booleanExpression?.visit this
print ' : '
statement?.messageExpression?.visit this
}
@Override
public void visitClosureListExpression(ClosureListExpression expression) {
boolean first = true
expression?.expressions?.each {
if (!first) {
print ';'
}
first = false
it.visit this
}
}
@Override
public void visitMethodPointerExpression(MethodPointerExpression expression) {
expression?.expression?.visit this
print '.&'
expression?.methodName?.visit this
}
@Override
public void visitArrayExpression(ArrayExpression expression) {
print 'new '
visitType expression?.elementType
print '['
visitExpressionsAndCommaSeparate(expression?.sizeExpression)
print ']'
}
private void visitExpressionsAndCommaSeparate(List expressions) {
boolean first = true
expressions?.each {
if (!first) {
print ', '
}
first = false
it.visit this
}
}
@Override
public void visitSpreadMapExpression(SpreadMapExpression expression) {
print '*:'
expression?.expression?.visit this
}
}
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