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// : 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");
}
} ///:~
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