An experience with antlr, java and python

Help With Personal Statement For Graduate School I was trying first to create the parser using GNU Flex and Bison in C, probably the best way for a very performancing parser. Yeah, that’s right.. but looking at the antlr syntax I realized that’s easier and easier. http://zidesigns.com/?online-essay-practise Online Essay Practise Moreover I start using this very useful eclipse plugin for antlr debugging which made my life easier!

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1 I Need Help Writing A 5 Page Paper import java.io.File; http://gocrossfit.com/literature-review-for-customer-loyalty-research/ Literature Review For Customer Loyalty Research import java.io.FileInputStream; Cheap Papers Please import java.io.FileNotFoundException; Pay To Have An Essay Written For You import antlr.CommonAST; Essay Writing On Mobiles import antlr.RecognitionException; http://www.mve.hu/?best-resume-writing-services-brisbane Best Resume Writing Services Brisbane import antlr.TokenStreamException; public class Application { public static void main(String argv[]) {
if(argv.length > 0)
{
File file = new File(argv[0]);
if(file.exists())
{
FileInputStream is = null;
try {
is = new FileInputStream(file);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
AS3Lexer L = new AS3Lexer(is);
AS3Parser P = new AS3Parser(L);
try {
P.compilationUnit();
} catch (RecognitionException e) {
// TODO Auto-generated catch block
System.out.println(" line=" + e.line + ", column="+ e.column);
System.out.println(e.getMessage());
e.printStackTrace(System.err);
} catch (TokenStreamException e) {
// TODO Auto-generated catch block
System.out.println(" line=" + L.getLine() + ", column="+ L.getColumn());
System.out.println(L.getGuessInfo());
System.out.println(e.getMessage());
e.printStackTrace(System.err);
}
CommonAST.setVerboseStringConversion(false, P.getTokenNames());
CommonAST ast = (CommonAST) P.getAST();
System.out.println("Tree:");
System.out.println(ast.toStringTree());
}
}
}
}

Everything works fine also for python, but I realized that the python script were so much slower than the java one!

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import sys
import antlr
import AS3Parser
import AS3Lexer
L = AS3Lexer.Lexer(filename);
P = AS3Parser.Parser(L);
P.setFilename(filename)
try:
   P.compilationUnit();
   ast = P.getAST();
except:
   pass

http://www.spinozabeachhouse.com/?i-want-to-buy-a-paper I Want To Buy A Paper So I run the python hotshot profiler to see which could be the bottleneck in the python script and I found most of the problems were due to unuseless antlr (the python module) method’s calls.
After making corrections to the antlr.py file the same script took exactly half of the time. Now 3 seconds. Wow 🙂
But not fast enough.
So I enabled for the antlr python script psyco module and this time the same script took Hire A Ghostwriter only 1.6 seconds.
Now the python script is fast enough, even if I’m sure I can make more optimizations in the antlr module…

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