import org.antlr.runtime.CommonTokenStream;
import org.antlr.runtime.ANTLRFileStream;
import org.antlr.runtime.debug.BlankDebugEventListener;
import java.io.File;
/** Parse a java file or directory of java files using the generated parser
* ANTLR builds from java.g
*/
class Main {
public static long lexerTime = 0;
public static boolean profile = false;
static JavaLexer lexer;
public static void main(String[] args) {
try {
long start = System.currentTimeMillis();
if (args.length > 0 ) {
// for each directory/file specified on the command line
for(int i=0; i< args.length;i++) {
doFile(new File(args[i])); // parse it
}
}
else {
System.err.println("Usage: java Main <directory or file name>");
}
long stop = System.currentTimeMillis();
System.out.println("finished parsing OK");
if ( profile ) {
System.out.println("num decisions "+profiler.numDecisions);
}
}
catch(Exception e) {
System.err.println("exception: "+e);
e.printStackTrace(System.err); // so we can get stack trace
}
}
// This method decides what action to take based on the type of
// file we are looking at
public static void doFile(File f)
throws Exception {
// If this is a directory, walk each file/dir in that directory
if (f.isDirectory()) {
String files[] = f.list();
for(int i=0; i < files.length; i++)
doFile(new File(f, files[i]));
}
// otherwise, if this is a java file, parse it!
else if ( ((f.getName().length()>5) &&
f.getName().substring(f.getName().length()-5).equals(".java"))
|| f.getName().equals("input") )
{
System.err.println("parsing "+f.getAbsolutePath());
parseFile(f.getAbsolutePath());
}
}
static class CountDecisions extends BlankDebugEventListener {
public int numDecisions = 0;
public void enterDecision(int decisionNumber) {
numDecisions++;
}
}
static CountDecisions profiler = new CountDecisions();
// Here's where we do the real work...
public static void parseFile(String f)
throws Exception {
try {
// Create a scanner that reads from the input stream passed to us
/*
if ( lexer==null ) {
lexer = new JavaLexer((org.antlr.runtime.CharStream)null);
}
*/
lexer = new JavaLexer(new ANTLRFileStream(f));
CommonTokenStream tokens = new CommonTokenStream();
tokens.setTokenSource(lexer);
/*
for (Object t : tokens.getTokens()) {
System.out.println(t);
}
*/
/*
long t1 = System.currentTimeMillis();
tokens.LT(1);
long t2 = System.currentTimeMillis();
System.out.println("lexing time: "+(t2-t1)+"ms");
*/
//System.out.println(tokens);
// Create a parser that reads from the scanner
JavaParser parser = null;
parser = new JavaParser(tokens);
// start parsing at the compilationUnit rule
parser.compilationUnit();
//System.err.println("finished "+f);
}
catch (Exception e) {
System.err.println("parser exception: "+e);
e.printStackTrace(); // so we can get stack trace
}
}
}