1 files changed, 43 insertions, 0 deletions
diff --git a/nodes.go b/nodes.go
new file mode 100644
index 0000000..c51db6f
--- /dev/null
+++ b/nodes.go
@@ -0,0 +1,43 @@
+package parsec
+
+type Node interface {
+	Pos() int
+}
+
+type Token struct {
+	pos   int
+	Value string
+}
+
+func (e Token) Pos() int { return e.pos }
+
+func NewToken(pos int, value string) Token {
+	return Token{pos, value}
+}
+
+type Error struct {
+	pos   int
+	Error string
+}
+
+func (e Error) Pos() int { return e.pos }
+
+func NewError(pos int, message string) Error {
+	return Error{pos, message}
+}
+
+func IsError(n Node) bool {
+	_, isErr := n.(Error)
+	return isErr
+}
+
+type Sequence struct {
+	pos   int
+	Nodes []Node
+}
+
+func (e Sequence) Pos() int { return e.pos }
+
+func NewSequence(pos int, n ...Node) Sequence {
+	return Sequence{pos, n}
+}