3 files changed, 28 insertions, 8 deletions

diff --git a/src/main/java/cuchaz/enigma/mapping/NameValidator.java b/src/main/java/cuchaz/enigma/mapping/NameValidator.java
index 9273c9b..fca8cfc 100644
--- a/src/main/java/cuchaz/enigma/mapping/NameValidator.java
+++ b/src/main/java/cuchaz/enigma/mapping/NameValidator.java
@@ -66,4 +66,8 @@ public class NameValidator {
         public static String validateArgumentName(String name) {
                 return validateFieldName(name);
         }
+
+        public static boolean isReserved(String name) {
+                return ReservedWords.contains(name);
+        }
 }
diff --git a/src/main/java/cuchaz/enigma/mapping/TypeDescriptor.java b/src/main/java/cuchaz/enigma/mapping/TypeDescriptor.java
index 3c8cc74..6e58aa0 100644
--- a/src/main/java/cuchaz/enigma/mapping/TypeDescriptor.java
+++ b/src/main/java/cuchaz/enigma/mapping/TypeDescriptor.java
@@ -223,14 +223,14 @@ public class TypeDescriptor {
         }
 
         public enum Primitive {
-                Byte('B'),
-                Character('C'),
-                Short('S'),
-                Integer('I'),
-                Long('J'),
-                Float('F'),
-                Double('D'),
-                Boolean('Z');
+                BYTE('B'),
+                CHARACTER('C'),
+                SHORT('S'),
+                INTEGER('I'),
+                LONG('J'),
+                FLOAT('F'),
+                DOUBLE('D'),
+                BOOLEAN('Z');
 
                 private static final Map<Character, Primitive> lookup;
 
diff --git a/src/main/java/cuchaz/enigma/mapping/entry/MethodDefEntry.java b/src/main/java/cuchaz/enigma/mapping/entry/MethodDefEntry.java
index 960b08d..fa9e668 100644
--- a/src/main/java/cuchaz/enigma/mapping/entry/MethodDefEntry.java
+++ b/src/main/java/cuchaz/enigma/mapping/entry/MethodDefEntry.java
@@ -42,4 +42,20 @@ public class MethodDefEntry extends MethodEntry implements DefEntry {
         public MethodDefEntry updateOwnership(ClassEntry classEntry) {
                 return new MethodDefEntry(new ClassEntry(classEntry.getName()), name, descriptor, signature, access);
         }
+
+        public int getArgumentIndex(ClassDefEntry ownerEntry, int localVariableIndex) {
+                int argumentIndex = localVariableIndex;
+
+                // Enum constructors have an implicit "name" and "ordinal" parameter as well as "this"
+                if (ownerEntry.getAccess().isEnum() && getName().startsWith("<")) {
+                        argumentIndex -= 2;
+                }
+
+                // If we're not static, "this" is bound to index 0
+                if (!getAccess().isStatic()) {
+                        argumentIndex -= 1;
+                }
+
+                return argumentIndex;
+        }
 }