Fmt.java Source code

Introduction

Here is the source code for Fmt.java

Source

/*
 * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
 * All rights reserved. Software written by Ian F. Darwin and others.
 * $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 * Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
 * cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
 * pioneering role in inventing and promulgating (and standardizing) the Java 
 * language and environment is gratefully acknowledged.
 * 
 * The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
 * inventing predecessor languages C and C++ is also gratefully acknowledged.
 */

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

/**
 * Fmt - format text (like Berkeley UNIX fmt).
 */
public class Fmt {
    /** The maximum column width */
    public static final int COLWIDTH = 72;

    /** The file that we read and format */
    BufferedReader in;

    /** If files present, format each, else format the standard input. */
    public static void main(String[] av) throws IOException {
        if (av.length == 0)
            new Fmt(System.in).format();
        else
            for (int i = 0; i < av.length; i++)
                new Fmt(av[i]).format();
    }

    /** Construct a Formatter given a filename */
    public Fmt(String fname) throws IOException {
        in = new BufferedReader(new FileReader(fname));
    }

    /** Construct a Formatter given an open Stream */
    public Fmt(InputStream file) throws IOException {
        in = new BufferedReader(new InputStreamReader(file));
    }

    /** Format the File contained in a constructed Fmt object */
    public void format() throws IOException {
        String w, f;
        int col = 0;
        while ((w = in.readLine()) != null) {
            if (w.length() == 0) { // null line
                System.out.print("\n"); // end current line
                if (col > 0) {
                    System.out.print("\n"); // output blank line
                    col = 0;
                }
                continue;
            }

            // otherwise it's text, so format it.
            StringTokenizer st = new StringTokenizer(w);
            while (st.hasMoreTokens()) {
                f = st.nextToken();

                if (col + f.length() > COLWIDTH) {
                    System.out.print("\n");
                    col = 0;
                }
                System.out.print(f + " ");
                col += f.length() + 1;
            }
        }
        if (col > 0)
            System.out.print("\n");
        in.close();
    }
}