Java String Split by Length splitEscapedString(String str, char sep, char esc, int maxPart)

Description

split Escaped String

License

Apache License

Declaration

public static List<String> splitEscapedString(String str, char sep, char esc, int maxPart) 

Method Source Code

//package com.java2s;
/**/*from ww  w .java  2 s . c  om*/
 * Copyright 2014-2017 Functional Genomics Development Team, European Bioinformatics Institute
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 *
 * @author Mikhail Gostev <gostev@gmail.com>
 **/

import java.util.ArrayList;

import java.util.List;

public class Main {
    public static List<String> splitEscapedString(String str, char sep, char esc, int maxPart) {
        List<String> res = new ArrayList<>();

        if (maxPart == 1) {
            res.add(str);
            return res;
        }

        int ptr = 0;
        int beg = 0;
        int len = str.length();

        while (true) {
            if (beg == len) {
                res.add("");
                break;
            }

            int pos = str.indexOf(sep, ptr);

            if (pos == -1) {
                if (res.size() == 0) {
                    res.add(str);
                } else {
                    res.add(str.substring(beg));
                }

                break;
            }

            int nEcs = 0;
            for (int i = pos - 1; i >= 0; i--) {
                if (str.charAt(i) == esc) {
                    nEcs++;
                } else {
                    break;
                }
            }

            if (nEcs % 2 == 0) // even number of escapes
            {
                res.add(str.substring(beg, pos));

                if (maxPart > 0 && res.size() == maxPart - 1) {
                    res.add(pos + 1 < len ? str.substring(pos + 1) : "");
                    break;
                }

                beg = pos + 1;
            }

            ptr = pos + 1;

        }

        return res;
    }
}

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