TheReplacements.java Source code

Introduction

Here is the source code for TheReplacements.java

Source

// : c12:TheReplacements.java
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/*
 * ! Here's a block of text to use as input to the regular expression matcher.
 * Note that we'll first extract the block of text by looking for the special
 * delimiters, then process the extracted block. !
 */

public class TheReplacements {
    public static void main(String[] args) throws Exception {
        String s = TextFile.read("TheReplacements.java");
        // Match the specially-commented block of text above:
        Matcher mInput = Pattern.compile("/\\*!(.*)!\\*/", Pattern.DOTALL).matcher(s);
        if (mInput.find())
            s = mInput.group(1); // Captured by parentheses
        // Replace two or more spaces with a single space:
        s = s.replaceAll(" {2,}", " ");
        // Replace one or more spaces at the beginning of each
        // line with no spaces. Must enable MULTILINE mode:
        s = s.replaceAll("(?m)^ +", "");
        System.out.println(s);
        s = s.replaceFirst("[aeiou]", "(VOWEL1)");
        StringBuffer sbuf = new StringBuffer();
        Pattern p = Pattern.compile("[aeiou]");
        Matcher m = p.matcher(s);
        // Process the find information as you
        // perform the replacements:
        while (m.find())
            m.appendReplacement(sbuf, m.group().toUpperCase());
        // Put in the remainder of the text:
        m.appendTail(sbuf);
        System.out.println(sbuf);

    }
} ///:~

class TextFile extends ArrayList {
    // Tools to read and write files as single strings:
    public static String read(String fileName) throws IOException {
        StringBuffer sb = new StringBuffer();
        BufferedReader in = new BufferedReader(new FileReader(fileName));
        String s;
        while ((s = in.readLine()) != null) {
            sb.append(s);
            sb.append("\n");
        }
        in.close();
        return sb.toString();
    }

    public static void write(String fileName, String text) throws IOException {
        PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(fileName)));
        out.print(text);
        out.close();
    }

    public TextFile(String fileName) throws IOException {
        super(Arrays.asList(read(fileName).split("\n")));
    }

    public void write(String fileName) throws IOException {
        PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(fileName)));
        for (int i = 0; i < size(); i++)
            out.println(get(i));
        out.close();
    }

    // Simple test:
    public static void main(String[] args) throws Exception {
        String file = read("TextFile.java");
        write("test.txt", file);
        TextFile text = new TextFile("test.txt");
        text.write("test2.txt");
    }
} ///:~