Java String Split by Comma splitCommand(String command)

Description

Split a command line into an argument array.

License

Apache License

Parameter

Parameter	Description
command	the original command line from a shell

Return

argument array split from command

Declaration

public static String[] splitCommand(String command) 

Method Source Code

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

import java.util.ArrayList;

public class Main {
    /**/*w w  w.  ja  v  a 2 s .c  o  m*/
     * Split a command line into an argument array. This routine 
     * segments the given command line by whitespace characters 
     * with the exception that strings between double quotation 
     * marks are considered to be single arguments, and will not 
     * be split.
     * 
     * @param command the original command line from a shell
     * 
     * @return argument array split from command 
     * 
     */
    public static String[] splitCommand(String command) {

        char[] commandCharArr = command.toCharArray();
        int idx = 0;
        int beginPos = 0;
        int endPos = 0;
        char ch = ' ';
        /*
         * Quote Matching State:
         * 0: Start
         * 1: Left double quotation mark found
         * 2: Right double quotation mark found
         */
        int state = 0;
        String argument = "";
        ArrayList<String> argList = new ArrayList<String>();
        while (idx < commandCharArr.length) {
            ch = commandCharArr[idx];
            // System.out.print(ch);
            if (ch == '"' && state == 0) { // Left double quotation mark is found
                beginPos = idx + 1;
                state = 1;
            } else if (ch == '"' && state == 1) { // Right double quotation mark is found
                state = 2;
            } else if (ch == ' ') {
                if (state == 2) { // Right double quotation mark has already been found
                    endPos = idx - 1;
                    state = 0;
                } else if (state == 1) { // Between left and right quotation marks
                    idx++;
                    continue;
                } else {
                    endPos = idx;
                }
                argument = command.substring(beginPos, endPos).trim();
                if (!argument.isEmpty())
                    argList.add(argument);
                // System.out.println();
                while (idx < commandCharArr.length && commandCharArr[idx] == ' ') {
                    idx++;
                }
                if (idx == commandCharArr.length)
                    break;
                beginPos = idx;
                continue;
            } else if (idx == commandCharArr.length - 1) {
                endPos = idx + 1;
                argument = command.substring(beginPos, endPos).trim();
                if (!argument.isEmpty())
                    argList.add(argument);
                break;
            }
            idx++;
        }

        return argList.toArray(new String[argList.size()]);

    }
}

Related

1. splitAtCommaOrPipe(String input)
2. splitComma(final String strWithComma)
3. splitComma(String configValue)
4. splitCommand(String command)
5. splitCommand(String command)
6. splitCommandString(String command_string)
7. splitCommaSequence(String argumentString)
8. splitCommaStr(String commaStr)
9. splitDoubleParentCommas(String input)