Added support for value flags to CommandContext.

src/main/java/com/sk89q/minecraft/util/commands/CommandContext.java

@@ -18,12 +18,16 @@
 
 package com.sk89q.minecraft.util.commands;
 
+import java.util.Arrays;
+import java.util.HashMap;
 import java.util.HashSet;
+import java.util.Map;
 import java.util.Set;
 
 public class CommandContext {
-    protected String[] args;
+    protected final String[] args;
-    protected Set<Character> flags = new HashSet<Character>();
+    protected final Set<Character> booleanFlags = new HashSet<Character>();
+    protected final Map<Character, String> valueFlags = new HashMap<Character, String>();
 
     public CommandContext(String args) {
         this(args.split(" "));
@@ -36,7 +40,7 @@ public class CommandContext {
                 // Ignore this
             } else if (args[i].charAt(0) == '-' && args[i].matches("^-[a-zA-Z]+$")) {
                 for (int k = 1; k < args[i].length(); ++k) {
-                    flags.add(args[i].charAt(k));
+                    booleanFlags.add(args[i].charAt(k));
                 }
             } else {
                 break;
@@ -51,6 +55,54 @@ public class CommandContext {
         this.args = newArgs;
     }
 
+    public CommandContext(String[] args, Set<Character> isValueFlag) throws CommandException {
+        int nextArg = 0;
+
+        booleanFlags.clear();
+        valueFlags.clear();
+
+        while (nextArg < args.length) {
+            // Fetch argument
+            String arg = args[nextArg++];
+
+            // Empty argument? (multiple consecutive spaces)
+            if (arg.isEmpty())
+                continue;
+
+            // No more flags?
+            if (arg.charAt(0) != '-' || arg.length() == 1) {
+                --nextArg;
+                break;
+            }
+
+            // Handle flag parsing terminator --
+            if (arg.equals("--"))
+                break;
+
+            // Go through the flags
+            for (int i = 1; i < arg.length(); ++i) {
+                char flagName = arg.charAt(i);
+
+                if (isValueFlag.contains(flagName)) {
+                    // Skip empty arguments...
+                    while (nextArg < args.length && args[nextArg].isEmpty())
+                        ++nextArg;
+
+                    if (nextArg >= args.length)
+                        throw new CommandException("No value specified for "+flagName+" flag.");
+
+                    // If it is a value flag, read another argument and add it
+                    valueFlags.put(flagName, args[nextArg++]);
+                }
+                else {
+                    booleanFlags.add(flagName);
+                }
+            }
+        }
+
+        this.args = Arrays.copyOfRange(args, nextArg, args.length);
+    }
+
     public String getCommand() {
         return args[0];
     }
@@ -105,11 +157,51 @@ public class CommandContext {
     }
 
     public boolean hasFlag(char ch) {
-        return flags.contains(ch);
+        return booleanFlags.contains(ch) || valueFlags.containsKey(ch);
     }
 
     public Set<Character> getFlags() {
-        return flags;
+        return booleanFlags;
+    }
+
+    public Map<Character, String> getValueFlags() {
+        return valueFlags;
+    }
+
+    public String getFlag(char ch) {
+        return valueFlags.get(ch);
+    }
+
+    public String getFlag(char ch, String def) {
+        final String value = valueFlags.get(ch);
+        if (value == null)
+            return def;
+
+        return value;
+    }
+
+    public int getFlagInteger(char ch) throws NumberFormatException {
+        return Integer.parseInt(valueFlags.get(ch));
+    }
+
+    public int getFlagInteger(char ch, int def) throws NumberFormatException {
+        final String value = valueFlags.get(ch);
+        if (value == null)
+            return def;
+
+        return Integer.parseInt(value);
+    }
+
+    public double getFlagDouble(char ch) throws NumberFormatException {
+        return Double.parseDouble(valueFlags.get(ch));
+    }
+
+    public double getFlagDouble(char ch, double def) throws NumberFormatException {
+        final String value = valueFlags.get(ch);
+        if (value == null)
+            return def;
+
+        return Double.parseDouble(value);
     }
 
     public int length() {