diff --git a/examples/type_metadata/type_metadata.c b/examples/type_metadata/type_metadata.c
index 554806f..948758f 100644
--- a/examples/type_metadata/type_metadata.c
+++ b/examples/type_metadata/type_metadata.c
@@ -31,10 +31,16 @@ struct TypeInfo
     TypeKind kind;
     MD_Node *node;
     
-    // struct member list
+    // member list
     struct TypeMember *first_member;
     struct TypeMember *last_member;
     int member_count;
+    
+    // enumerant list
+    struct TypeEnumerant *first_enumerant;
+    struct TypeEnumerant *last_enumerant;
+    int enumerant_count;
+    
 };
 
 typedef struct TypeMember TypeMember;
@@ -45,6 +51,14 @@ struct TypeMember
     TypeInfo *type;
 };
 
+typedef struct TypeEnumerant TypeEnumerant;
+struct TypeEnumerant
+{
+    TypeEnumerant *next;
+    MD_Node *node;
+    int value;
+};
+
 typedef struct MapInfo MapInfo;
 struct MapInfo
 {
@@ -161,13 +175,14 @@ main(int argc, char **argv)
         }
     }
     
-    // build struct member lists
+    // build member lists
     for (TypeInfo *type = first_type;
          type != 0;
          type = type->next)
     {
         if (type->kind == TypeKind_Struct)
         {
+            // build the list
             MD_b32 got_list = 1;
             TypeMember *first_member = 0;
             TypeMember *last_member = 0;
@@ -207,6 +222,8 @@ main(int argc, char **argv)
                 {
                     TypeInfo *type_info = (TypeInfo*)type_info_slot->val;
                     
+                    // TODO(allen): handle the array tag
+                    
                     TypeMember *member = MD_PushArray(arena, TypeMember, 1);
                     member->node = member_node;
                     member->type = type_info;
@@ -217,6 +234,7 @@ main(int argc, char **argv)
                 skip_member:;
             }
             
+            // save the list
             if (got_list)
             {
                 type->first_member = first_member;
@@ -226,6 +244,71 @@ main(int argc, char **argv)
         }
     }
     
+    // build enumerant lists
+    for (TypeInfo *type = first_type;
+         type != 0;
+         type = type->next)
+    {
+        if (type->kind == TypeKind_Enum)
+        {
+            // build the list
+            MD_b32 got_list = 1;
+            TypeEnumerant *first_enumerant = 0;
+            TypeEnumerant *last_enumerant = 0;
+            int enumerant_count = 0;
+            
+            int next_implicit_value = 0;
+            
+            MD_Node *type_root_node = type->node;
+            for (MD_EachNode(enumerant_node, type_root_node->first_child))
+            {
+                MD_Node *value_node = enumerant_node->first_child;
+                int value = 0;
+                
+                // missing value node?
+                if (MD_NodeIsNil(value_node))
+                {
+                    value = next_implicit_value;
+                    next_implicit_value += 1;
+                }
+                
+                // has value node
+                else
+                {
+                    MD_String8 value_string = value_node->string;
+                    if (!MD_StringIsCStyleInt(value_string))
+                    {
+                        got_list = 0;
+                        goto skip_enumerant;
+                    }
+                    value = (int)MD_CStyleIntFromString(value_string);
+                }
+                
+                // set next implicit value
+                next_implicit_value = value + 1;
+                
+                // save enumerant
+                if (got_list)
+                {
+                    TypeEnumerant *enumerant = MD_PushArray(arena, TypeEnumerant, 1);
+                    enumerant->node = enumerant_node;
+                    enumerant->value = value;
+                    MD_QueuePush(first_enumerant, last_enumerant, enumerant);
+                    enumerant_count += 1;
+                }
+                
+                skip_enumerant:;
+            }
+            
+            // save the list
+            if (got_list)
+            {
+                type->first_enumerant = first_enumerant;
+                type->last_enumerant = last_enumerant;
+                type->enumerant_count = enumerant_count;
+            }
+        }
+    }
     
     // TODO check types & build member lists
     // TODO check maps & build case lists
@@ -257,6 +340,15 @@ main(int argc, char **argv)
                    MD_S8VArg(member->node->string),
                    MD_S8VArg(member->type->node->string));
         }
+        
+        // print enumerant lists
+        for (TypeEnumerant *enumerant = type->first_enumerant;
+             enumerant != 0;
+             enumerant = enumerant->next){
+            printf("  %.*s: %d\n",
+                   MD_S8VArg(enumerant->node->string),
+                   enumerant->value);
+        }
     }
     
     for (MapInfo *map = first_map;
diff --git a/examples/type_metadata/types.mdesk b/examples/type_metadata/types.mdesk
index 5d3aff6..7e42765 100644
--- a/examples/type_metadata/types.mdesk
+++ b/examples/type_metadata/types.mdesk
@@ -32,9 +32,9 @@ RoundedPolygon:
 @type(enum: U32)
 Shape:
 {
-  Circle:  1,
-  Segment: 2,
-  Polygon: 3,
+  Circle: 1,
+  Segment,
+  Polygon,
 }
 
 @map(Shape -> `$Type`; complete)
diff --git a/source/md.c b/source/md.c
index 78efe81..c881154 100644
--- a/source/md.c
+++ b/source/md.c
@@ -1500,21 +1500,99 @@ MD_S8ChopWhitespace(MD_String8 string)
 
 //~ Numeric Strings
 
+MD_GLOBAL MD_u8 md_char_to_value[] = {
+    0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,
+    0x08,0x09,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
+    0xFF,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,0xFF,
+    0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
+};
+
+MD_GLOBAL MD_u8 md_char_is_integer[] = {
+    0,0,0,0,0,0,1,1,
+    1,0,0,0,1,0,0,0,
+    0,0,0,0,0,0,0,0,
+    0,0,0,0,0,0,0,0,
+};
+
+MD_FUNCTION MD_b32
+MD_StringIsU64(MD_String8 string, MD_u32 radix)
+{
+    MD_b32 result = 0;
+    if (string.size > 0)
+    {
+        result = 1;
+        for (MD_u8 *ptr = string.str, *opl = string.str + string.size;
+             ptr < opl;
+             ptr += 1)
+        {
+            MD_u8 c = *ptr;
+            if (!md_char_is_integer[c >> 3])
+            {
+                result = 0;
+                break;
+            }
+            if (md_char_to_value[(c - 0x30)&0x1F] >= radix)
+            {
+                result = 0;
+                break;
+            }
+        }
+    }
+    return(result);
+}
+
+MD_FUNCTION MD_b32
+MD_StringIsCStyleInt(MD_String8 string)
+{
+    MD_u8 *ptr = string.str;
+    MD_u8 *opl = string.str + string.size;
+    
+    // consume sign
+    for (;ptr < opl && (*ptr == '+' || *ptr == '-'); ptr += 1);
+    
+    // radix from prefix
+    MD_u64 radix = 10;
+    if (ptr < opl)
+    {
+        MD_u8 c0 = *ptr;
+        if (c0 == '0')
+        {
+            ptr += 1;
+            radix = 8;
+            if (ptr < opl)
+            {
+                MD_u8 c1 = *ptr;
+                if (c1 == 'x')
+                {
+                    ptr += 1;
+                    radix = 0x10;
+                }
+                else if (c1 == 'b')
+                {
+                    ptr += 1;
+                    radix = 2;
+                }
+            }
+        }
+    }
+    
+    // check integer "digits"
+    MD_String8 digits_substr = MD_S8Range(ptr, opl);
+    MD_b32 result = MD_StringIsU64(digits_substr, radix);
+    
+    return(result);
+}
+
 MD_FUNCTION MD_u64
 MD_U64FromString(MD_String8 string, MD_u32 radix)
 {
     MD_Assert(2 <= radix && radix <= 16);
-    static MD_u8 char_to_value[] = {
-        0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,
-        0x08,0x09,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
-        0xFF,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,0xFF,
-        0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
-    };
     MD_u64 value = 0;
-    for (MD_u64 i = 0; i < string.size; i += 1){
+    for (MD_u64 i = 0; i < string.size; i += 1)
+    {
         value *= radix;
         MD_u8 c = string.str[i];
-        value += char_to_value[(c - 0x30)&0x1F];
+        value += md_char_to_value[(c - 0x30)&0x1F];
     }
     return(value);
 }
@@ -1526,31 +1604,39 @@ MD_CStyleIntFromString(MD_String8 string)
     
     // consume sign
     MD_i64 sign = +1;
-    if (p < string.size){
+    if (p < string.size)
+    {
         MD_u8 c = string.str[p];
-        if (c == '-'){
+        if (c == '-')
+        {
             sign = -1;
             p += 1;
         }
-        else if (c == '+'){
+        else if (c == '+')
+        {
             p += 1;
         }
     }
     
     // radix from prefix
     MD_u64 radix = 10;
-    if (p < string.size){
+    if (p < string.size)
+    {
         MD_u8 c0 = string.str[p];
-        if (c0 == '0'){
+        if (c0 == '0')
+        {
             p += 1;
             radix = 8;
-            if (p < string.size){
+            if (p < string.size)
+            {
                 MD_u8 c1 = string.str[p];
-                if (c1 == 'x'){
+                if (c1 == 'x')
+                {
                     p += 1;
                     radix = 16;
                 }
-                else if (c1 == 'b'){
+                else if (c1 == 'b')
+                {
                     p += 1;
                     radix = 2;
                 }
@@ -1572,7 +1658,8 @@ MD_F64FromString(MD_String8 string)
 {
     char str[64];
     MD_u64 str_size = string.size;
-    if (str_size > sizeof(str) - 1){
+    if (str_size > sizeof(str) - 1)
+    {
         str_size = sizeof(str) - 1;
     }
     MD_MemoryCopy(str, string.str, str_size);
diff --git a/source/md.h b/source/md.h
index ab42d2f..e26c0db 100644
--- a/source/md.h
+++ b/source/md.h
@@ -1005,6 +1005,9 @@ MD_FUNCTION MD_String8 MD_S8ChopWhitespace(MD_String8 string);
 
 //~ Numeric Strings
 
+MD_FUNCTION MD_b32     MD_StringIsU64(MD_String8 string, MD_u32 radix);
+MD_FUNCTION MD_b32     MD_StringIsCStyleInt(MD_String8 string);
+
 MD_FUNCTION MD_u64     MD_U64FromString(MD_String8 string, MD_u32 radix);
 MD_FUNCTION MD_i64     MD_CStyleIntFromString(MD_String8 string);
 MD_FUNCTION MD_f64     MD_F64FromString(MD_String8 string);