[antlr-interest] FW: CSharp Target...
Hamilton Link
helink at sandia.gov
Mon Jun 16 08:22:14 PDT 2008
In case you didn't see my thread from a little while back, I was having
trouble with 3.1b1 until I rebuilt the java tool AND the .net assemblies
it was generating code against (I am targeting CSharp2 and generating
ASTs). I wasn't using the debug features, though. Personally I'd get a
simple non-debug example working locally and then once you're sure your
.net assemblies and grammar-generated code are valid and sufficient you
can try fancier things.
h
Kris Erickson wrote:
> First of all, let me state that Antlr appears to be an awesome tool.
> AntlrWorks is amazing, being able to debug, combining the lexer and
> parser, and having a parser for walking the trees. The Antlr book is
> fantastic, the website is at time frustrating, but still and excellent
> reference and the short period of time I have spent with the project has
> made me start considering DSL's for all sorts of purposes. However,
> trying to work in Csharp has been a bit of a nightmare.
>
> Initially I was trying to work in Antlr 3.1b1, but getting random errors
> that simply did not occur when debugging the parser in Java (as well as
> endless compile errors when even attempting to create a debug, but
> compiling the "Simple tree-based interpreter" (the first one)
> http://www.antlr.org/wiki/display/ANTLR3/Simple+tree-based+interpeter
>
> With the following changes:
>
> 4a5
>
>> language=CSharp2;
>>
> 13a15,18
>
>> @header {
>> using System.Collections.Generic;
>> }
>>
>>
> 16c21
> < List<CommonTree> functionDefinitions = new
> ArrayList<CommonTree>();
> ---
>
>> public List<CommonTree> functionDefinitions = new
>> List<CommonTree>();
>>
> 32c37
> < functionDefinitions.add($func.tree);
> ---
>
>> functionDefinitions.Add($func.tree);
>>
> 68c73
> < WS : (' '|'\t')+ { skip(); }
> ---
>
>> WS : (' '|'\t')+ { Skip(); }
>>
>
> Results in:
>
> C:\svnprojects\Expression\Expression>java org.antlr.Tool -debug Expr1.g
> ANTLR Parser Generator Version 3.1b1 (May 20, 2008) 1989-2008
> error(10): internal error: Expr1.g : java.util.NoSuchElementException:
> no such attribute: n in template context [output File parser
> genericParser(...) region__genericParser__members
> region__genericParser__members if(grammar.grammarIsRoot)_s ubtemplate
> else_subtemplate ctorForRootGrammar createListenerAndHandshake
> if(PARSER)_subtemplate]
> org.antlr.stringtemplate.StringTemplate.checkNullAttributeAgainstFormalA
> rguments(StringTemplate.java:1290)
> org.antlr.stringtemplate.StringTemplate.get(StringTemplate.java:814)
> org.antlr.stringtemplate.StringTemplate.get(StringTemplate.java:812)
> org.antlr.stringtemplate.StringTemplate.get(StringTemplate.java:812)
> org.antlr.stringtemplate.StringTemplate.get(StringTemplate.java:812)
> org.antlr.stringtemplate.StringTemplate.get(StringTemplate.java:812)
> org.antlr.stringtemplate.StringTemplate.get(StringTemplate.java:812)
> org.antlr.stringtemplate.StringTemplate.get(StringTemplate.java:812)
> org.antlr.stringtemplate.StringTemplate.get(StringTemplate.java:812)
> org.antlr.stringtemplate.StringTemplate.get(StringTemplate.java:812)
> org.antlr.stringtemplate.StringTemplate.getAttribute(StringTemplate.java
> :696)
> org.antlr.stringtemplate.language.ActionEvaluator.attribute(ActionEvalua
> tor.java:360)
> org.antlr.stringtemplate.language.ActionEvaluator.expr(ActionEvaluator.j
> ava:136)
> org.antlr.stringtemplate.language.ActionEvaluator.action(ActionEvaluator
> .java:84)
> org.antlr.stringtemplate.language.ASTExpr.write(ASTExpr.java:148)
> org.antlr.stringtemplate.StringTemplate.write(StringTemplate.java:714)
> org.antlr.stringtemplate.language.ConditionalExpr.writeSubTemplate(Condi
> tionalExpr.java:152)
> org.antlr.stringtemplate.language.ConditionalExpr.write(ConditionalExpr.
> java:103)
> org.antlr.stringtemplate.StringTemplate.write(StringTemplate.java:714)
> org.antlr.stringtemplate.language.ASTExpr.write(ASTExpr.java:715)
> org.antlr.stringtemplate.language.ASTExpr.writeAttribute(ASTExpr.java:65
> 2)
> org.antlr.stringtemplate.language.ActionEvaluator.action(ActionEvaluator
> .java:86)
> org.antlr.stringtemplate.language.ASTExpr.write(ASTExpr.java:148)
> org.antlr.stringtemplate.StringTemplate.write(StringTemplate.java:714)
> org.antlr.stringtemplate.language.ASTExpr.write(ASTExpr.java:715)
> org.antlr.stringtemplate.language.ASTExpr.writeAttribute(ASTExpr.java:65
> 2)
> org.antlr.stringtemplate.language.ActionEvaluator.action(ActionEvaluator
> .java:86)
> org.antlr.stringtemplate.language.ASTExpr.write(ASTExpr.java:148)
> org.antlr.stringtemplate.StringTemplate.write(StringTemplate.java:714)
> org.antlr.stringtemplate.language.ConditionalExpr.write(ConditionalExpr.
> java:126)
> org.antlr.stringtemplate.StringTemplate.write(StringTemplate.java:714)
> org.antlr.stringtemplate.language.ConditionalExpr.writeSubTemplate(Condi
> tionalExpr.java:152)
> org.antlr.stringtemplate.language.ConditionalExpr.write(ConditionalExpr.
> java:103)
> org.antlr.stringtemplate.StringTemplate.write(StringTemplate.java:714)
> org.antlr.stringtemplate.language.ASTExpr.write(ASTExpr.java:715)
> org.antlr.stringtemplate.language.ASTExpr.writeAttribute(ASTExpr.java:65
> 2)
> org.antlr.stringtemplate.language.ActionEvaluator.action(ActionEvaluator
> .java:86)
> org.antlr.stringtemplate.language.ASTExpr.write(ASTExpr.java:148)
> org.antlr.stringtemplate.StringTemplate.write(StringTemplate.java:714)
> org.antlr.stringtemplate.language.ASTExpr.write(ASTExpr.java:715)
> org.antlr.stringtemplate.language.ASTExpr.writeAttribute(ASTExpr.java:65
> 2)
> org.antlr.stringtemplate.language.ActionEvaluator.action(ActionEvaluator
> .java:86)
> org.antlr.stringtemplate.language.ASTExpr.write(ASTExpr.java:148)
> org.antlr.stringtemplate.StringTemplate.write(StringTemplate.java:714)
> org.antlr.stringtemplate.language.ASTExpr.write(ASTExpr.java:715)
> org.antlr.stringtemplate.language.ASTExpr.writeAttribute(ASTExpr.java:65
> 2)
> org.antlr.stringtemplate.language.ActionEvaluator.action(ActionEvaluator
> .java:86)
> org.antlr.stringtemplate.language.ASTExpr.write(ASTExpr.java:148)
> org.antlr.stringtemplate.StringTemplate.write(StringTemplate.java:714)
> org.antlr.stringtemplate.language.ASTExpr.write(ASTExpr.java:715)
> org.antlr.stringtemplate.language.ASTExpr.writeAttribute(ASTExpr.java:65
> 2)
> org.antlr.stringtemplate.language.ActionEvaluator.action(ActionEvaluator
> .java:86)
> org.antlr.stringtemplate.language.ASTExpr.write(ASTExpr.java:148)
> org.antlr.stringtemplate.StringTemplate.write(StringTemplate.java:714)
> org.antlr.codegen.CodeGenerator.write(CodeGenerator.java:1271)
> org.antlr.codegen.Target.genRecognizerFile(Target.java:94)
> org.antlr.codegen.CodeGenerator.genRecognizer(CodeGenerator.java:455)
> org.antlr.Tool.generateRecognizer(Tool.java:419)
> org.antlr.Tool.process(Tool.java:286)
> org.antlr.Tool.main(Tool.java:71)
>
> C:\svnprojects\Expression\Expression>
>
> Turning off debug, it compiles but now when it runs, it gets a null
> exception in Expr1Parser.cs
>
> char_literal19=(IToken)Match(input,13,FOLLOW_13_in_expr319);
> char_literal19_tree = (CommonTree)adaptor.Create(char_literal19);
> root_0 = (CommonTree)adaptor.BecomeRoot(char_literal19_tree, root_0);
>
> Because char_literal19 is null. Input looks good to me: {3+4\n}, so I
> don't know why Match is returning null...
>
> Compiling with 3.0.1 works fine. So I think, great, I'll use 3.0.1,
> however trying to run --debug with this. But I get the same error when
> debugging any tree grammer:
>
> In the prog
>
> int LA1_0 = input.LA(1);
>
> Message: "Object reference is not set to an instance of an
> object."
> Source: "Antlr3.Rutime"
> StackTrace: " at Antlr.Runtime.Debug.DebugTreeNodeStream.LA(Int32
> i)\r\n at Eval1.prog() in
> C:\\svnprojects\\Expression\\Expression2\\Eval1.cs:line 184\r\n at
> ConsoleApplication1.Program.Main(String[] args) in
> C:\\svnprojects\\Expression\\Expression2\\Program.cs:line 22\r\n at
> System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)\r\n
> at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence
> assemblySecurity, String[] args)\r\n at
> Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()\r\n
> at System.Threading.ThreadHelper.ThreadStart_Context(Object state)\r\n
> at System.Threading.ExecutionContext.Run(ExecutionContext
> executionContext, ContextCallback callback, Object state)\r\n at
> System.Threading.ThreadHelper.ThreadStart()"
> TargetSite: {Int32 LA(Int32)}
>
> So, I was wondering:
>
> 1) Is there any version of Antlr with CSharp that run with debug (in the
> tree grammar)?
> 2) Where can I find the sources to the 3.0.1 CSharp runtime so I can
> figure out why the DebugTreeNodeStream fails? I tried finding it at
> FishEye but downloading the source from Aug 2007 results only in the
> DLL's.
> 3) Is there any examples of Antlr with CSharp for any projects that use
> a Tree Grammar?
> 4) If the 3.1.b1 is the only version of Antlr that supports the CSharp2
> target, and the CSharp2
> target is so broken it won't run against a simple grammar like the
> "Simple Tree based interpreter",
> should the all the Wiki examples point to the CSharp2 grammar? I
> spent many hours thinking my
> own grammar had some weird errors because I was getting NULL
> exceptions only to find out that
> the 3.1.b1 with CSharp2 is very broken.
>
> Kris
>
>
>
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