Fix tab complete error for single property states

worldedit-core/src/main/java/com/boydti/fawe/command/SuggestInputParseException.java

@@ -11,6 +11,7 @@ import java.util.Arrays;
 import java.util.Collection;
 import java.util.List;
 import java.util.function.Supplier;
+import java.util.stream.Collectors;
 
 import static com.google.common.base.Preconditions.checkNotNull;
 
@@ -52,6 +53,14 @@ public class SuggestInputParseException extends InputParseException {
         return null;
     }
 
+    public static SuggestInputParseException of(String input, List<Object> values) {
+        throw new SuggestInputParseException("No value: " + input, input, () ->
+                values.stream()
+                        .map(v -> v.toString())
+                        .filter(v -> v.startsWith(input))
+                        .collect(Collectors.toList()));
+    }
+
     @Override
     public synchronized Throwable getCause() {
         return cause.getCause();

worldedit-core/src/main/java/com/sk89q/worldedit/registry/state/BooleanProperty.java

@@ -48,7 +48,14 @@ public class BooleanProperty extends AbstractProperty<Boolean> {
 
     @Override
     public int getIndexFor(CharSequence string) throws IllegalArgumentException {
-        return string.charAt(0) == 't' ? defaultIndex : 1 - defaultIndex;
+        switch (string.charAt(0)) {
+            case 't':
+                return defaultIndex;
+            case 'f':
+                return 1 - defaultIndex;
+            default:
+                return -1;
+        }
     }
 
     @Nullable

worldedit-core/src/main/java/com/sk89q/worldedit/world/block/BlockState.java

@@ -145,8 +145,10 @@ public class BlockState implements BlockStateHolder<BlockState>, FawePattern {
             String name = property.getName();
 
             charSequence.setSubstring(propStrStart + name.length() + 2, state.length() - 1);
-
-            return type.withPropertyId(property.getIndexFor(charSequence));
+            int index = charSequence.length() <= 0 ? -1 : property.getIndexFor(charSequence);
+            if (index != -1) {
+                return type.withPropertyId(index);
+            }
         }
         int stateId;
         if (defaultState != null) {
@@ -167,13 +169,7 @@ public class BlockState implements BlockStateHolder<BlockState>, FawePattern {
                     if (property != null) {
                         int index = property.getIndexFor(charSequence);
                         if (index == -1) {
-                            String input = charSequence.toString();
-                            List<Object> values = property.getValues();
-                            throw new SuggestInputParseException("No value: " + input + " for " + type, input, () ->
-                                values.stream()
-                                .map(v -> v.toString())
-                                .filter(v -> v.startsWith(input))
-                                .collect(Collectors.toList()));
+                            throw SuggestInputParseException.of(charSequence.toString(), property.getValues());
                         }
                         stateId = property.modifyIndex(stateId, index);
                     } else {