Компиляторы 4 лаба (7) Position

import java.util.*;
import java.lang.Object;

public class Position implements Comparable<Position> {
    private String text;
    private int line, pos, index;

    public Position (String text) {
        this.text = text;
        line = pos = 1;
        index = 0;
    }

    public String Text(){return text;}
    public int Line(){return line;}
    public int Pos(){return pos;}
    public int Index(){return index;}
    public Position copyPos(){
        return new Position(text);
    }

    public int compareTo (Position other){
        return Integer.compare(index, other.index);
    }

    public String toString(){
        return "(" + line + ',' + pos + ')';
    }

    public int cP() {
        if (index == text.length())
            return -1;
        return Character.codePointAt(text, index);
    }

    public boolean isWhiteSpace() {
        return Character.isWhitespace(cP());
    }

    public boolean isLetter() {
        return Character.isLetter(cP());
    }

    public boolean isLetterOrDigit() {
        return Character.isLetterOrDigit(cP());
    }

    public boolean isDecimalDigit() {
        return (index != text.length() &&
                text.charAt(index) >= '0' && text.charAt(index) <= '9');
    }

    public boolean isNewLine() {
        if (index == text.length())
            return true;
        if (text.charAt(index) == '\r' &&
                index + 1 < text.length())
            return (text.charAt(index + 1) == '\n');

        return (text.charAt(index) == '\n');
    }

    public void iterate() {
        if (index < text.length()) {
            if (isNewLine()) {
                if (text.charAt(index) == '\r')
                    index++;
                line++;
                pos = 1;
            } else {
                if (Character.isHighSurrogate(text.charAt(index))) {
                    index++;
                }
                pos++;
            }
            index++;
        }
    }
}