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List:       groovy-scm
Subject:    [groovy-scm] [jira] Updated: (GROOVY-1566) problems with if statements not
From:       "Jochen Theodorou (JIRA)" <jira () codehaus ! org>
Date:       2006-11-29 10:00:40
Message-ID: 41586553.1164794440976.JavaMail.haus-jira () codehaus01 ! managed ! contegix ! com
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     [ http://jira.codehaus.org/browse/GROOVY-1566?page=all ]

Jochen Theodorou updated GROOVY-1566:
-------------------------------------

         Assignee: Jochen Theodorou  (was: Guillaume Laforge)
    Fix Version/s: 1.0-final
      Component/s: bytecode

> problems with if statements not returning correctly
> ---------------------------------------------------
> 
> Key: GROOVY-1566
> URL: http://jira.codehaus.org/browse/GROOVY-1566
> Project: groovy
> Issue Type: Bug
> Components: bytecode
> Reporter: Alex Shneyderman
> Assigned To: Jochen Theodorou
> Fix For: 1.0-final
> 
> 
> package groovy.runtime.metaclass.org.codehaus.groovy.antlr
> import groovy.formatter.DefaultTraverser
> import java.beans.IntrospectionException
> class GroovySourceASTMetaClass extends MetaClassImpl {
> 	public GroovySourceASTMetaClass(MetaClassRegistry mcr, Class clazz) throws \
> IntrospectionException {  super(mcr, clazz)
> 	}
> // version that exhibits the bug
> 	Object getProperty(final Object object, final String property) {
> 		if (property == "children") {
> 			new ASTIterator(next:object.firstChild)
> 		} else {
> 			super.getProperty(object, property)
> 		}
> 	}
> /* version that works 	
> 	Object getProperty(final Object object, final String property) {
> 		def result = null
> 		
> 		if (property == "children") {
> 			result = new ASTIterator(next:object.firstChild)
> 		} else {
> 			result = super.getProperty(object, property)
> 		}
> 		
> 		return result
> 	}
> */
> }
> class ASTIterator implements Iterator {
> 	Object next = null
> 	boolean hasNext() {
> 		return next != null;
> 	}
> 	Object next() {
> 		def prevNext = next
> 		next = next.nextSibling
> 		prevNext
> 	}
> 	void remove() {
> 		throw new RuntimeException("Removal of AST nodes is not implemented.");
> 	}
> 	
> }
> // and here is some script that trips with an exception
> GroovyRecognizer parser = null
> UnicodeEscapingReader unicodeReader = new UnicodeEscapingReader(new StringReader \
> ("println 'Hello, there!'"), null) GroovyLexer lexer = new \
> GroovyLexer(unicodeReader) unicodeReader.setLexer(lexer)
> parser = GroovyRecognizer.make(lexer)
> parser.compilationUnit()
> 	    
> GroovySourceAST ast = (GroovySourceAST) parser.getAST()
> ast.children.each { println it.text }
> // exception thrown is 
> // Note: execution is not that of the snippet above.
> /*
> Exception in thread "main" java.lang.VerifyError: (class: \
> groovy/runtime/metaclass/org/codehaus/groovy/antlr/GroovySourceASTMetaClass, \
> method: getProperty signature: \
> (Ljava/lang/Object;Ljava/lang/String;)Ljava/lang/Object;) Inconsistent stack height \
> 1 != 0  at java.lang.Class.forName0(Native Method)
> 	at java.lang.Class.forName(Class.java:164)
> 	at groovy.lang.MetaClassRegistry.getMetaClassFor(MetaClassRegistry.java:218)
> 	at groovy.lang.MetaClassRegistry.getMetaClass(MetaClassRegistry.java:142)
> 	at org.codehaus.groovy.runtime.Invoker.getProperty(Invoker.java:247)
> 	at org.codehaus.groovy.runtime.InvokerHelper.getProperty(InvokerHelper.java:213)
> 	at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.getProperty(ScriptBytecodeAdapter.java:501)
>   at groovy.formatter.GroovySourceFormatter.format(GroovySourceFormatter.groovy:44)
> 	at gjdk.groovy.formatter.GroovySourceFormatter_GroovyReflector.invoke(Unknown \
> Source)  at groovy.lang.MetaMethod.invoke(MetaMethod.java:111)
> 	at org.codehaus.groovy.runtime.MetaClassHelper.doMethodInvoke(MetaClassHelper.java:659)
>   at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:377)
> 	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:344)
> 	at org.codehaus.groovy.runtime.Invoker.invokeMethod(Invoker.java:134)
> 	at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:111)
> 	at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnCurrentN(ScriptBytecodeAdapter.java:89)
>   at groovy.formatter.GroovySourceFormatter$_run_closure2.doCall(GroovySourceFormatter.groovy:28)
>   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>   at java.lang.reflect.Method.invoke(Method.java:585)
> 	at org.codehaus.groovy.runtime.ReflectionMetaMethod.invoke(ReflectionMetaMethod.java:67)
>   at org.codehaus.groovy.runtime.MetaClassHelper.doMethodInvoke(MetaClassHelper.java:659)
>   at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:377)
> 	at groovy.lang.Closure.call(Closure.java:176)
> 	at groovy.lang.Closure.call(Closure.java:189)
> 	at org.codehaus.groovy.runtime.DefaultGroovyMethods.each(DefaultGroovyMethods.java:677)
>   at gjdk.java.util.Collection_GroovyReflector.invoke(Unknown Source)
> 	at groovy.lang.MetaMethod.invoke(MetaMethod.java:111)
> 	at org.codehaus.groovy.runtime.NewInstanceMetaMethod.invoke(NewInstanceMetaMethod.java:99)
>   at org.codehaus.groovy.runtime.MetaClassHelper.doMethodInvoke(MetaClassHelper.java:659)
>   at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:377)
> 	at org.codehaus.groovy.runtime.Invoker.invokeMethod(Invoker.java:122)
> 	at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:111)
> 	at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodN(ScriptBytecodeAdapter.java:165)
>   at groovy.formatter.GroovySourceFormatter.run(GroovySourceFormatter.groovy:28)
> 	at gjdk.groovy.formatter.GroovySourceFormatter_GroovyReflector.invoke(Unknown \
> Source)  at groovy.lang.MetaMethod.invoke(MetaMethod.java:111)
> 	at org.codehaus.groovy.runtime.MetaClassHelper.doMethodInvoke(MetaClassHelper.java:659)
>   at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:377)
> 	at org.codehaus.groovy.runtime.Invoker.invokeMethod(Invoker.java:134)
> 	at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:111)
> 	at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodN(ScriptBytecodeAdapter.java:165)
>   at groovy.formatter.GroovySourceFormatter.main(GroovySourceFormatter.groovy:12)
> */

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