Added simple arrays.

src/value.h

@@ -4,11 +4,13 @@
 #include <inttypes.h>
 
 struct Bytecode; /* forward */
+struct Array;    /* forward */
 
 typedef enum {
     VAL_INT,
     VAL_STRING,
     VAL_FUNCTION,
+    VAL_ARRAY,
     VAL_NIL
 } ValueType;
 
@@ -18,6 +20,7 @@ typedef struct {
         int64_t i;
         char *s;
         struct Bytecode *fn;
+        struct Array *arr;
     };
 } Value;
 
@@ -27,9 +30,15 @@ Value make_string(const char *s);
 Value make_function(struct Bytecode *fn);
 Value make_nil(void);
 
-/* copy (deep for strings), free (free string only) */
-Value copy_value(const Value *v);
-void free_value(Value v);
+/* arrays */
+Value make_array_from_values(const Value *vals, int count); /* deep-copies vals */
+int array_length(const Value *v);                            /* returns -1 if not array */
+int array_get_copy(const Value *v, int index, Value *out);   /* returns 0 on error; out = copy_value(item) */
+int array_set(Value *v, int index, Value newElem);           /* returns 0 on error; takes ownership of newElem */
+
+/* copy/free */
+Value copy_value(const Value *v);    /* deep for strings, RC for arrays, shallow fn */
+void free_value(Value v);            /* frees owned resources */
 
 /* utilities */
 void print_value(const Value *v);