init

1 files changed, 31 insertions, 0 deletions

diff --git a/src/expr.h b/src/expr.h
new file mode 100644
index 0000000..5795e8b
--- /dev/null
+++ b/src/expr.h
@@ -0,0 +1,31 @@
+#ifndef ANIMTOOL_EXPR_H_
+#define ANIMTOOL_EXPR_H_
+
+#include "op.h"
+#include "source.h"
+
+enum expr_type
+{
+    EXPR_NUMBER,
+    EXPR_OP,
+    EXPR_TIME,
+};
+
+struct expr
+{
+    struct range loc;
+    enum expr_type type;
+    union {
+        double number;
+        struct {
+            enum op_type type;
+            array(struct expr) args;
+        } op;
+    };
+};
+
+double expr_eval(struct expr *expr, double time);
+void expr_free(struct expr *expr);
+void expr_copy(struct expr *dst, struct expr *src);
+
+#endif