1 files changed, 17 insertions, 0 deletions
diff --git a/internal/lexer/statefunc.go b/internal/lexer/statefunc.go
new file mode 100644
index 0000000..8d0e42a
--- /dev/null
+++ b/internal/lexer/statefunc.go
@@ -0,0 +1,17 @@
+package lexer
+
+type stateFunc func(*Lexer) stateFunc
+
+type stateStack []stateFunc
+
+func (ss *stateStack) Push(s stateFunc) {
+	*ss = append(*ss, s)
+}
+
+func (ss *stateStack) Pop() (s stateFunc) {
+	if len(*ss) == 0 {
+		return nil
+	}
+	*ss, s = (*ss)[:len(*ss)-1], (*ss)[len(*ss)-1]
+	return s
+}