With separate Lexer and Parser ...
class YamlLexical extends StdLexical with YamlTokens with RegexParsers {...
object YamlParser extends StdTokenParsers with YamlTokens with PackratParsers {...
... how to get the position of the parsed string into AST classes?
(... positioned(elem(...)) * ... )^^ { ... => List( Ast(startpos, parsedtext, ... subnodes ... ), ... )}
The type of positioned
is
def positioned[T <: Positional](p: ⇒ Parser[T]): Parser[T]
which means that the parsed elements must extend Positional
. So, for example, YamlLexical
should be:
class YamlLexical extends Positional
in that way, any parsed element will automatically have a pos
which records the position in which it was parsed.
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