Implement reserved operators.

src/reserved.c

@@ -2,11 +2,38 @@
 #include "string.h"
 #include "util.h"
 
+libab_result _behavior_assign(libab* ab, libab_ref* scope, 
+                              libab_tree* left, libab_tree* right,
+                              libab_ref* into) {
+    libab_result result = LIBAB_SUCCESS;
+
+    if(left->variant == TREE_ID) {
+        result = libab_run_tree_scoped(ab, right, scope, into);
+        if(result == LIBAB_SUCCESS) {
+            result = libab_put_table_value(libab_ref_get(scope), left->string_value, into);
+        }
+
+        if(result != LIBAB_SUCCESS) {
+            libab_ref_free(into);
+        }
+    } else {
+        result = LIBAB_UNEXPECTED;
+    }
+
+    if(result != LIBAB_SUCCESS) {
+        libab_ref_null(into);
+    }
+
+    return result;
+}
+
 static const libab_reserved_operator libab_reserved_operators[] = {{
     "=", /* Assignment */
     0,   /* Lowest precedence */
-    1    /* Right associative, a = b = 6 should be a = (b = 6) */
+    1,   /* Right associative, a = b = 6 should be a = (b = 6) */
+    _behavior_assign
 }};
+
 static const size_t element_count =
     sizeof(libab_reserved_operators) / sizeof(libab_reserved_operator);