An experience with antlr, java and python

http://www.fkbv.uni-mb.si/?phd-thesis-health Phd Thesis Health I was trying first to create the parser using GNU Flex and Bison in C, probably the best way for a very performancing parser. Custom History Dissertation Service Insp Yeah, that’s right.. but looking at the antlr syntax I realized that’s easier and easier. Moreover I start using this very useful eclipse plugin for antlr debugging which made my life easier!

http://multiele.net/homework-help-ks3/ Homework Help Ks3

1 import java.io.File; import java.io.FileInputStream; Write Essay Your Best Friend import java.io.FileNotFoundException; import antlr.CommonAST; import antlr.RecognitionException; import antlr.TokenStreamException; public class Application { public static void main(String argv[]) http://www.goldcoastaustralia.com/?dissertation-histoire-mthodologie Dissertation Histoire Mthodologie { 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());
}
}
}
}

http://www.jokservice.eu/?help-with-writing-a-business-plan Help With Writing A Business Plan Everything works fine also for python, but I realized that the python script were so much slower than the java one!

http://www.noticiasdigital.es/doctor-application-cover-letter/ Doctor Application Cover Letter
1
2
3
4
5
6
7
8
9
10
11
12
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

Dissertation Proposal On Crm 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 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…