package lab3;

import java.util.HashMap;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class RegexUtils {
    private HashMap<Integer, String> hashMap = new HashMap<Integer, String>();
    final String END = "(\\s|$)";
    final String STRING_REGEX = "(^\\'(('')|[^']*)\\')";
    final String NUMBER_REGEX = "(^\\-{0,1}\\d*\\.{0,1}\\d+)";
    final String IDENTIFIER_REGEX = "(^[\\p{L}]{1}[\\.\\p{L}0-9]*)";
    final String PATTERN = STRING_REGEX + "|" + NUMBER_REGEX + "|" + IDENTIFIER_REGEX + END ;

    public void getTypeOfString(String stringForSearchIn, int lineNumber, int length) {
        hashMap.put(1, "STRING");
        hashMap.put(4, "NUMBER");
        hashMap.put(5, "IDENTIFIER");
        Pattern pattern = Pattern.compile(PATTERN, Pattern.UNICODE_CHARACTER_CLASS);
        Matcher matcher;
        while (stringForSearchIn.length() != 0) {
            matcher = pattern.matcher(stringForSearchIn);

            if (matcher.find()) {
                int i = 0;
                if (matcher.group(2) != null) {
                    i = 1;
                } else if (matcher.group(4) != null) {
                    i = 4;
                } else if (matcher.group(5) != null) {
                    i = 5;
                }

                System.out.println(hashMap.get(i) + "(" + lineNumber + ", " +
                        (length - stringForSearchIn.length() + 1) +
                        "): " +
                        matcher.group(0)
                );
                stringForSearchIn = stringForSearchIn.substring(matcher.group(i).length());
            } else if (stringForSearchIn.charAt(0) == ' ' || stringForSearchIn.charAt(0) == '\t') {
                stringForSearchIn = stringForSearchIn.substring(1);
            } else {
                System.out.println("syntax error (" +
                        lineNumber + ", " + (length - stringForSearchIn.length() + 1) + ")"
                );
                while (stringForSearchIn.length() != 0
                        && stringForSearchIn.charAt(0) != ' '
                        && stringForSearchIn.charAt(0) != '\t') {
                    stringForSearchIn = stringForSearchIn.substring(1);
                }
            }

        }
    }

}