//
// hint for homework #3 -- uses StreamTokenizer to count
//      lines of C-style source
//

import java.io.* ;

public class CountCLines {

        // command line argument is infile
        // counts lines of infile, ignoring any that contain only
        //      whitespace or (part of a) C-style comment.

        public static void main(String[] args) {

                if (args.length < 1) {
                        System.exit(-1) ;
                }

                StreamTokenizer st = null ;

                // build StreamTokenizer object reading from
                //      an input stream whose source is infile
                try {
                        st = new StreamTokenizer(
                                new FileReader(args[0])) ;
                } catch (FileNotFoundException e) {
                        System.out.println("Input file " + args[0] + 
                                " not found") ;
                        System.exit(-1) ;
                }
                // set up StreamTokenizer:
                //      reset to turn off all default behaviors
                st.resetSyntax() ;
                //      group alphanumerics into words
                st.wordChars('a', 'z') ;        
                st.wordChars('A', 'Z') ;        
                st.wordChars('0', '9') ;
                //      ignore whitespace
                st.whitespaceChars(0, ' ') ;
                //      parse quoted strings (double quotes)
                st.quoteChar('"') ;
                //      ignore C-style comments
                st.slashStarComments(true) ;

                int prevLine = 0 ; int thisLine = 0 ;
                int count = 0 ;
                try {
                        int tokenType = st.nextToken() ;
                        while (tokenType != StreamTokenizer.TT_EOF) {
                                thisLine = st.lineno() ;
                                if (thisLine != prevLine) {
                                        count++ ;
                                        prevLine = thisLine ;
                                }
                                tokenType = st.nextToken() ;
                        }
                } catch (IOException e) {
                        System.out.println("I/O error during parsing") ;
                }

                System.out.println("line count, " +
                        "excluding C comments and whitespace, is " +
                        count) ;
        }
}