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/*-
* ============LICENSE_START=======================================================
* 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.
* ============LICENSE_END=========================================================
*/
package com.woorea.openstack.console;
import java.util.StringTokenizer;
import java.util.Vector;
public class CommandLineHelper {
public static String[] parse(String input) {
if (input == null || input.length() == 0) {
//no command? no string
return new String[0];
}
// parse with a simple finite state machine
final int normal = 0;
final int inQuote = 1;
final int inDoubleQuote = 2;
int state = normal;
StringTokenizer tok = new StringTokenizer(input, "\"\' ", true);
Vector v = new Vector();
StringBuffer current = new StringBuffer();
boolean lastTokenHasBeenQuoted = false;
while (tok.hasMoreTokens()) {
String nextTok = tok.nextToken();
switch (state) {
case inQuote:
if ("\'".equals(nextTok)) {
lastTokenHasBeenQuoted = true;
state = normal;
} else {
current.append(nextTok);
}
break;
case inDoubleQuote:
if ("\"".equals(nextTok)) {
lastTokenHasBeenQuoted = true;
state = normal;
} else {
current.append(nextTok);
}
break;
default:
if ("\'".equals(nextTok)) {
state = inQuote;
} else if ("\"".equals(nextTok)) {
state = inDoubleQuote;
} else if (" ".equals(nextTok)) {
if (lastTokenHasBeenQuoted || current.length() != 0) {
v.addElement(current.toString());
current = new StringBuffer();
}
} else {
current.append(nextTok);
}
lastTokenHasBeenQuoted = false;
break;
}
}
if (lastTokenHasBeenQuoted || current.length() != 0) {
v.addElement(current.toString());
}
if (state == inQuote || state == inDoubleQuote) {
throw new RuntimeException("unbalanced quotes in " + input);
}
String[] args = new String[v.size()];
v.copyInto(args);
return args;
}
}
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