package examples;

import java.util.Scanner;
import java.util.regex.PatternSyntaxException;

public class InteractiveScanner {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in); // scan the standard input stream
		String text = "";
		String pattern = "[a-z]+";
		while (true) {
			// prompt for input
			System.out.print("> ");  System.out.flush();
			// consume command code (t/text, p/pattern, e/exit) and update state
			String type = s.next().toLowerCase();
			if (type.equals("t") || type.equals("text")) {
				text = s.nextLine().trim();
			} else if (type.equals("p") || type.equals("pattern")) {
				pattern = s.nextLine().trim();
			} else if (type.equals("e") || type.equals("exit")) {
				System.exit(0);
			}
			// perform scan of text using the pattern
			try {
				System.out.println("With pattern [" + pattern + "], scanning: " + text);
				Scanner textScan = new Scanner(text);
				String result = null;
				while ((result = textScan.findInLine(pattern)) != null && result.length() > 0)
					System.out.println(result);
			} catch (PatternSyntaxException pse) {
				System.out.println("Illegal pattern " + pattern);
				System.out.println(pse.getMessage());
				pattern = "";
			}
		}
	}

}