1 files changed, 36 insertions, 0 deletions
diff --git a/as/as.y b/as/as.y
new file mode 100644
index 0000000..ed8714f
--- /dev/null
+++ b/as/as.y
@@ -0,0 +1,36 @@
+%{
+#include <inttypes.h>
+%}
+
+%union {
+	char *s;
+	uintmax_t n;
+};
+
+%token<n> NUMBER
+%token<s> TOKEN
+%token NEWLINE
+
+%%
+
+program
+	: /* empty */
+	| instruction NEWLINE
+;
+
+instruction
+	: bare_instruction
+	| TOKEN ':' bare_instruction
+;
+
+bare_instruction
+	: TOKEN
+	| TOKEN operand
+	| TOKEN operand ',' operand
+	| TOKEN operand ',' operand ',' operand
+;
+
+operand
+	: TOKEN
+	| NUMBER
+;