enums.h

Makefile

@@ -3,7 +3,7 @@ all: lisp
 CC = gcc
 CFLAGS = -Wall -Wextra
 
-OBJS = main.c.o
+OBJS = main.c.o enums.c.o
 
 lisp: $(OBJS)
 	$(CC) -o $@ $^ $(CFLAGS)

enums.c

@@ -0,0 +1,16 @@
+#include "enums.h"
+
+#include <stddef.h>
+
+const char *State_to_str(enum State state)
+{
+    switch (state) {
+    case STATE_INIT: return "STATE_INIT";
+    case STATE_WHITESPACE: return "STATE_WHITESPACE";
+    case STATE_OPEN: return "STATE_OPEN";
+    case STATE_CLOSE: return "STATE_CLOSE";
+    case STATE_ID: return "STATE_ID";
+    case STATE_NUM: return "STATE_NUM";
+    }
+    return NULL;
+}

enums.h

@@ -0,0 +1,22 @@
+#ifndef __ENUMS_H__
+#define __ENUMS_H__
+
+enum State {
+    STATE_INIT,
+    STATE_WHITESPACE,
+    STATE_OPEN,
+    STATE_CLOSE,
+    STATE_ID,
+    STATE_NUM,
+};
+
+enum Type {
+  TYPE_PAIR,
+  TYPE_ATOM,
+  TYPE_STRING,
+  TYPE_NUMBER,
+};
+
+const char *State_to_str(enum State state);
+
+#endif

main.c

@@ -1,3 +1,5 @@
+#include "enums.h"
+
 #include <assert.h>
 #include <ctype.h>
 #include <stddef.h>
@@ -6,28 +8,12 @@
 #include <stdlib.h>
 #include <string.h>
 
-enum State {
-    STATE_INIT,
-    STATE_WHITESPACE,
-    STATE_OPEN,
-    STATE_CLOSE,
-    STATE_ID,
-    STATE_NUM,
-};
-
 struct Token {
     struct Token *next;
     enum State type;
     char *val;
 };
 
-enum Type {
-  TYPE_PAIR,
-  TYPE_ATOM,
-  TYPE_STRING,
-  TYPE_NUMBER,
-};
-
 struct Object {
   enum Type type;
   union {
@@ -52,7 +38,6 @@ static void error(const char *msg);
  * Lexer *
  *********/
 
-static const char *state_str(enum State state);
 static void buffer_add(char chr);
 static void buffer_clean();
 static void token_add(enum State type, char *val);
@@ -93,7 +78,7 @@ int main()
     printf("Tokens:\n");
 
     for (const struct Token *token = tokens; token; token = token->next) {
-        printf("%s:%s;\n", state_str(token->type), token->val);
+        printf("%s:%s;\n", State_to_str(token->type), token->val);
     }
 
     struct Object *const program = parse();
@@ -112,19 +97,6 @@ void error(const char *msg)
  * Lexer *
  *********/
 
-const char *state_str(enum State state)
-{
-    switch (state) {
-    case STATE_INIT: return "STATE_INIT";
-    case STATE_WHITESPACE: return "STATE_WHITESPACE";
-    case STATE_OPEN: return "STATE_OPEN";
-    case STATE_CLOSE: return "STATE_CLOSE";
-    case STATE_ID: return "STATE_ID";
-    case STATE_NUM: return "STATE_NUM";
-    }
-    return NULL;
-}
-
 void buffer_add(char chr)
 {
     if (buffer_index >= 1000) error("token too long");