Hi all.
I just signed up on this list after contacting Mr. Niemann about the antlr
Python binding. He suggested checking here for a little help.
To transform a large bunch of java interface files to classes and stubs for a
(broad) Java-to-C interface, I would like to generate all of the wrapper code
and tables needed for JNI using a code-generator written in Python (I have more
experience in python and think it es better suited for creating text outputs).
When I launch ANTLR 3.1.1 with the Python output option on the Java 1.5 grammar
file (from the antlr website), I am experiencing some problems.
First of all, antlr outputs an internal error and some warnings. Then, the
generated python files contain a few lines of code, which are more java than
python and won't compile without some manual fixing. And when I'm done with
that, the generated parser won't work... :-(
Am I missing something here?
The output of antlr when taking the Java 1.5 grammer and just adding the
'language=Python' option:
C:\MIB\ANTLR>java -classpath ./antlrworks-1.2.1.jar org.antlr.Tool
grammar\Java.g
ANTLR Parser Generator Version 3.1.1
error(10): internal error: eval tree parse error : <AST>:0:0: unexpected AST
node:
org.antlr.stringtemplate.language.ActionEvaluator.expr(Unknown Source)
org.antlr.stringtemplate.language.ActionEvaluator.action(Unknown Source)
org.antlr.stringtemplate.language.ASTExpr.evaluateExpression(Unknown Source)
org.antlr.stringtemplate.language.ASTExpr.handleExprOptions(Unknown Source)
org.antlr.stringtemplate.language.ASTExpr.write(Unknown Source)
org.antlr.stringtemplate.StringTemplate.write(Unknown Source)
org.antlr.stringtemplate.language.ConditionalExpr.writeSubTemplate(Unknown Sourc
e)
org.antlr.stringtemplate.language.ConditionalExpr.write(Unknown Source)
org.antlr.stringtemplate.StringTemplate.write(Unknown Source)
org.antlr.stringtemplate.language.ASTExpr.write(Unknown Source)
org.antlr.stringtemplate.language.ASTExpr.writeAttribute(Unknown Source)
org.antlr.stringtemplate.language.ActionEvaluator.action(Unknown Source)
org.antlr.stringtemplate.language.ASTExpr.write(Unknown Source)
org.antlr.stringtemplate.StringTemplate.write(Unknown Source)
org.antlr.stringtemplate.language.ASTExpr.write(Unknown Source)
org.antlr.stringtemplate.language.ASTExpr.writeAttribute(Unknown Source)
org.antlr.stringtemplate.language.ActionEvaluator.action(Unknown Source)
org.antlr.stringtemplate.language.ASTExpr.write(Unknown Source)
org.antlr.stringtemplate.StringTemplate.write(Unknown Source)
org.antlr.codegen.CodeGenerator.write(CodeGenerator.java:1275)
org.antlr.codegen.Target.genRecognizerFile(Target.java:94)
org.antlr.codegen.CodeGenerator.genRecognizer(CodeGenerator.java:460)
org.antlr.Tool.generateRecognizer(Tool.java:420)
org.antlr.Tool.process(Tool.java:287)
org.antlr.Tool.main(Tool.java:72)
Then, the python interpreter stumbles over this:
if not ((t1.getLine() == t2.getLine() && .....
(python requires 'and', not '&&'.)
or this:
protected boolean enumIsKeyword = true;
that looks like java. Python wood need something like enumIsKeyword=True
Finally this:
if (!enumIsKeyword) _type=Identifier;
Here, the ! operator instead of 'not' is used, and the colon is missing.
It should be: if not enumIsKeyword: _type=Identifier
When I fix these little bugs manually in the antlr output and try to feed it
with a sample java file, the parser fails:
Traceback (most recent call last):
File "testprog.py", line 59, in ?
main(sys.argv[1:])
File "testprog.py", line 35, in main
parser.compilationUnit()
File "grammar\JavaParser.py", line 361, in compilationUnit
alt8 = self.dfa8.predict(self.input)
File "C:\Dahlhoff\MIB\ANTLRtest\antlr3\dfa.py", line 92, in predict
c = input.LA(1)
File "C:\Dahlhoff\MIB\ANTLRtest\antlr3\streams.py", line 859, in LA
return self.LT(i).type
File "C:\Dahlhoff\MIB\ANTLRtest\antlr3\streams.py", line 801, in LT
self.fillBuffer()
File "C:\Dahlhoff\MIB\ANTLRtest\antlr3\streams.py", line 669, in fillBuffer
t = self.tokenSource.nextToken()
File "C:\Dahlhoff\MIB\ANTLRtest\antlr3\recognizers.py", line 1133, in
nextToken
self._state.tokenStartCharIndex = self.input.index()
TypeError: find/rfind/index/rindex() takes at least 1 argument (0 given)
Thanks for any help with this.
Achim.
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