Java String Split by Line splitBySeparatorQuoteAndParen(String line, char sep)

Description

Split using a separator, but allow for the separator to occur in nested parentheses without splitting.

License

GNU General Public License

Parameter

Parameter	Description
line	the string to split
sep	the seperator character, e.g. a comma

Return

the split string

Declaration

public static String[] splitBySeparatorQuoteAndParen(String line, char sep) 

Method Source Code

//package com.java2s;
/***************************************
 *            ViPER                    *
 *  The Video Processing               *
 *         Evaluation Resource         *
 *                                     *
 *  Distributed under the GPL license  *
 *        Terms available at gnu.org.  *
 *                                     *
 *  Copyright University of Maryland,  *
 *                      College Park.  *
 ***************************************/

import java.util.*;

public class Main {
    /**/*from w  w  w  . j a va2s . c  om*/
     * Split using a separator, but allow for the separator to occur
     * in nested parentheses without splitting.
     * <PRE>
     *   E.g.   "1", 2*("2,3"), "4"
     *      would split into
     *        -- "1"
     *        -- 2*("2,3")
     *        -- "4"
     * </PRE>
     * If the data has an odd number of "s, it will append a " character
     * to the end. In order to include a quote character without delimiting
     * a string, use the \". For a \, use \\.
     * @param line the string to split
     * @param sep the seperator character, e.g. a comma
     * @return the split string
     */
    public static String[] splitBySeparatorQuoteAndParen(String line, char sep) {
        boolean withinQuotes = false;
        String newLine = new String(line);
        Vector temp = new Vector();
        StringBuffer nextString = new StringBuffer();
        int nesting = 0;

        for (int i = 0; i < newLine.length(); i++) {
            char c = newLine.charAt(i);

            if (c == '\\') {
                if ((++i >= newLine.length()) && (nextString.length() > 0)) {
                    temp.addElement(nextString.toString());
                    break;
                } else {
                    switch (newLine.charAt(i)) {
                    case 'n':
                        nextString.append('\n');
                        break;

                    case '"':
                        nextString.append('"');
                        break;

                    default:
                        nextString.append(newLine.charAt(i));
                    }
                }
            } else if (c == '"') {
                withinQuotes = !withinQuotes;
                nextString.append('"');
            } else if (!withinQuotes) {
                if (c == '(') {
                    nesting++;
                    nextString.append('(');
                } else if (c == ')') {
                    nesting--;
                    nextString.append(')');
                } else {
                    if ((nesting == 0) && (c == sep)) {
                        temp.addElement(nextString.toString());
                        nextString.delete(0, nextString.length());
                    } else {
                        nextString.append(newLine.charAt(i));
                    }
                }
            } else {
                nextString.append(newLine.charAt(i));
            }
        }

        if (withinQuotes) {
            nextString.append('"');
        }

        temp.addElement(nextString.toString());

        String[] result = new String[temp.size()];

        for (int i = 0; i < result.length; i++) {
            result[i] = (String) temp.elementAt(i);
        }
        return (result);
    }
}

Related

1. splitArguments(String commandLine, boolean backslashesAreLiteral)
2. splitArgumentsBackslashesAreLiteral(String commandLine)
3. splitByBrackets(String line)
4. splitBySeparator(String line, char sep)
5. splitBySeparatorAndParen(String line, char sep)
6. splitCommandLine(String str, boolean extract)
7. splitCommaSeparated(String line)
8. splitHiddenNewLine(String s)
9. splitInt(String line, String seperator, int def)