An experience with antlr, java and python

Thesis Help Dublin I was trying first to create the parser using GNU Flex and Bison in C, probably the best way for a very performancing parser. Design Section Psychology Dissertation Yeah, that’s right.. but looking at the antlr syntax I realized that’s easier and easier. Oxford Phd Thesis Search Moreover I start using this very useful eclipse plugin for antlr debugging which made my life easier!

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1 How To Write An Admission Essay With A Thesis Statement import java.io.File; http://www.hospitaldelsur.gov.co/?custom-writings-com-discount-code Custom Writings Com Discount Code import java.io.FileInputStream; Write An Essay About An Outing import java.io.FileNotFoundException; http://kurilo.pro/rice-phd-thesis/ Rice Phd Thesis import antlr.CommonAST; Caught Custom Essay import antlr.RecognitionException; import antlr.TokenStreamException; public class Application { http://www.jokservice.eu/?admission-essay-custom-writing-professional Admission Essay Custom Writing Professional public static void main(String argv[]) Buy Masters Thesis { http://stephtemple.co.uk/?medical-research-paper-help Medical Research Paper Help if(argv.length > 0) What Should I Write My Narrative Essay About { What Is A Bibliography 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());
}
}
}
}

Homework We Can Help 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://historia-sportu.cba.pl/?the-yellow-wallpaper-analysis-essay The Yellow Wallpaper Analysis Essay 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 Homeworkhelper 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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