From 3f660a9b219b03bd5188cd4f0da9a58f507a933a Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@gmail.com>
Date: Tue, 2 Feb 2010 22:45:20 -0500
Subject: Support #ifdef and #ifndef.

---
 dimension/directives.rules | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'dimension/directives.rules')

diff --git a/dimension/directives.rules b/dimension/directives.rules
index 392408d..5a30455 100644
--- a/dimension/directives.rules
+++ b/dimension/directives.rules
@@ -30,6 +30,18 @@ LANGUAGE_DIRECTIVE: "#declare" "identifier" "=" RVALUE {
                     dmnsn_local_symbol(symtable, "__cond__", cond);
                     dmnsn_delete_astnode(cond);
                   }
+                  | "#ifdef" "(" "identifier" ")" {
+                    dmnsn_astnode *node = dmnsn_find_symbol(symtable, $3);
+                    dmnsn_local_symbol(symtable, "__cond__",
+                                       dmnsn_new_ast_integer(node ? 1 : 0));
+                    free($3);
+                  }
+                  | "#ifndef" "(" "identifier" ")" {
+                    dmnsn_astnode *node = dmnsn_find_symbol(symtable, $3);
+                    dmnsn_local_symbol(symtable, "__cond__",
+                                       dmnsn_new_ast_integer(node ? 0 : 1));
+                    free($3);
+                  }
 
 RVALUE: ARITH_EXPR ";" %dprec 2 {
         $$ = dmnsn_eval($1, symtable);
-- 
cgit v1.2.3