feat: stuff

pkg/parser/parser.go

@@ -9,7 +9,7 @@ import (
 )
 
 func ParseExpression(i *iterator.Iterator[tokenizer.Token]) (lambda.Expression, error) {
-	token, err := i.Next()
+	token, err := i.Pop()
 	if err != nil {
 		return nil, fmt.Errorf("could not get next token: %w", err)
 	}
@@ -23,7 +23,7 @@ func ParseExpression(i *iterator.Iterator[tokenizer.Token]) (lambda.Expression,
 		atoms := []string{}
 
 		for {
-			atom, atomErr := i.Next()
+			atom, atomErr := i.Pop()
 			if atomErr != nil {
 				return nil, fmt.Errorf("could not find parameter or terminator of function: %w", atomErr)
 			} else if atom.Type == tokenizer.TokenVariable {
@@ -72,7 +72,7 @@ func ParseExpression(i *iterator.Iterator[tokenizer.Token]) (lambda.Expression,
 			args = append(args, arg)
 		}
 
-		closing, closingErr := i.Next()
+		closing, closingErr := i.Pop()
 		if closingErr != nil {
 			return nil, fmt.Errorf("could not parse call terminating parenthesis: %w", closingErr)
 		} else if closing.Type != tokenizer.TokenCloseParen {
@@ -94,6 +94,5 @@ func ParseExpression(i *iterator.Iterator[tokenizer.Token]) (lambda.Expression,
 }
 
 func GetTree(tokens []tokenizer.Token) (lambda.Expression, error) {
-	i := iterator.New(tokens)
-	return ParseExpression(&i)
+	return ParseExpression(iterator.New(tokens))
 }