1 files changed, 51 insertions, 0 deletions
diff --git a/mardown/ast.go b/mardown/ast.go
new file mode 100644
index 0000000..76328f4
--- /dev/null
+++ b/mardown/ast.go
@@ -0,0 +1,51 @@
+package mardown
+
+import (
+	"errors"
+	"fmt"
+)
+
+var ErrUnkownLexType = errors.New("unkown lex type")
+
+type block interface {
+	Eval() error
+}
+
+type tree struct {
+	blocks []block
+}
+
+func (t *tree) Eval() error {
+	return nil
+}
+
+func ast(lxs lexers) (*tree, error) {
+	tr := new(tree)
+	for lxs.Next() {
+		b, err := getBlock(lxs)
+		if err != nil {
+			return nil, err
+		}
+		tr.blocks = append(tr.blocks, b)
+	}
+	return tr, nil
+}
+
+func getBlock(lxs lexers) (block, error) {
+	var b block
+	var err error
+	switch lxs.Current().Type {
+	case lexerHeader:
+		b, err = header(lxs)
+	case lexerBreak:
+	case lexerExternal:
+	case lexerModifier:
+	case lexerCode:
+	case lexerEscape:
+	case lexerQuote:
+	case lexerLiteral:
+	default:
+		err = errors.Join(ErrUnkownLexType, fmt.Errorf("type received: %s", lxs.Current().Type))
+	}
+	return b, err
+}