Java String Split by Separator split(String s, String separator)

Description

Splits string by separator, if separator in string is backslashed, i.e.

License

Apache License

Declaration

public static List<String> split(String s, String separator) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.util.ArrayList;

import java.util.List;

public class Main {
    /** Splits string by separator, if separator in string is backslashed, i.e. prefixed by \ then
     *  it's ignored(preserved).//from ww w.  j av  a2  s.  c  o m
     **/
    public static List<String> split(String s, String separator) {
        if (s == null)
            return null;
        List<String> rslt = null;
        if (s.isEmpty() || isEmpty(separator)) {
            rslt = new ArrayList<>(1);
            rslt.add(s);
            return rslt;
        }

        //return s.split(COMMA_SPLIT); - NOT WORKING when compiled to JS

        int start = 0;
        int p = start;
        do {
            int j = s.indexOf(separator, p);
            if (j == -1) {
                if (rslt == null) {
                    rslt = new ArrayList<>(1);
                    rslt.add(s);
                    return rslt;
                }
                rslt.add(s.substring(start));
                break;
            }
            if (j > 0 && s.charAt(j - 1) == '\\') {
                p = j + 1;
                continue;
            } else {
                if (rslt == null)
                    rslt = new ArrayList<String>();
                rslt.add(s.substring(start, j));
                start = j + 1;
                p = start;
            }

        } while (true);

        return rslt;
    }

    public static boolean isEmpty(String s) {
        return s == null || s.length() == 0; // optimize like Guava: s.isEmpty() -> s.length() == 0
    }
}

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