decoder [WIP]

Signed-off-by: Alejandro Mery <amery@jpi.io>

decoder_token.go

@@ -0,0 +1,56 @@
+package ini
+
+import (
+	"fmt"
+	"log"
+
+	"asciigoat.org/core/lexer"
+	"asciigoat.org/ini/parser"
+)
+
+type token struct {
+	pos   lexer.Position
+	typ   parser.TokenType
+	value string
+}
+
+func (t token) String() string {
+	return fmt.Sprintf("%s %s: %q", t.pos, t.typ, t.value)
+}
+
+// typeOK tells if a token of the specified type is acceptable
+// at this time.
+func (dec *Decoder[T]) typeOK(typ parser.TokenType) bool
+
+// execute is called after each acceptable token is appended to the queue
+func (dec *Decoder[T]) execute() error
+
+// executeFinal is called after an error
+func (dec *Decoder[T]) executeFinal()
+
+// parserOnToken is the callback from the parser
+func (dec *Decoder[T]) parserOnToken(pos lexer.Position, typ parser.TokenType, value string) error {
+	var err error
+
+	log.Printf("%s: %s %s %q", "ini", pos, typ, value)
+
+	t := &token{pos, typ, value}
+	switch {
+	case typ == parser.TokenComment:
+		// ignore comments
+	case dec.typeOK(typ):
+		// acceptable token
+		dec.queue = append(dec.queue, t)
+		err = dec.execute()
+	default:
+		// unacceptable
+		err = dec.newErrInvalidToken(t)
+	}
+
+	if err != nil {
+		dec.executeFinal()
+		return err
+	}
+
+	return nil
+}