Creates CommandUtils class with parseArguments method

Fixes CLIENT-224

Change-Id: I89e8517eca2bfeb37672070368d3891e5cbe27bf
Reviewed-on: http://gerrit.dmdirc.com/1894
Reviewed-by: Shane Mc Cormack <shane@dmdirc.com>
Automatic-Compile: DMDirc Local Commits <dmdirc@googlemail.com>

src/com/dmdirc/util/CommandUtils.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2006-2011 Chris Smith, Shane Mc Cormack, Gregory Holmes,
+ * Simon Mott
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package com.dmdirc.util;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Utilities for manipulating strings
+ */
+public class CommandUtils {
+    /**
+     * Parses the specified command into an array of arguments. Arguments are
+     * separated by spaces. Multi-word arguments may be specified by starting
+     * the argument with a quote (") and finishing it with a quote (").
+     *
+     * @param command The command to parse
+     * @return An array of arguments corresponding to the command
+     */
+    public static String[] parseArguments(final String command) {
+        final List<String> args = new ArrayList<String>();
+        final StringBuilder builder = new StringBuilder();
+        boolean inquote = false;
+
+        for (String word : command.split(" ")) {
+            if (word.endsWith("\"") && inquote) {
+                args.add(builder.toString() + ' ' + word.substring(0, word.length() - 1));
+                builder.delete(0, builder.length());
+                inquote = false;
+            } else if (inquote) {
+                if (builder.length() > 0) {
+                    builder.append(' ');
+                }
+
+                builder.append(word);
+            } else if (word.startsWith("\"") && !word.endsWith("\"")) {
+                inquote = true;
+                builder.append(word.substring(1));
+            } else if (word.startsWith("\"") && word.endsWith("\"")) {
+                if (word.length() == 1) {
+                    inquote = true;
+                } else {
+                    args.add(word.substring(1, word.length() - 1));
+                }
+            } else {
+                args.add(word);
+            }
+        }
+
+        return args.toArray(new String[args.size()]);
+    }
+}