Hi all,
after a longer search, I don't found a good way to write comments
from the source file to template output. My workflow is the following:
Lexer (which puts comments into the hidden channel) -> parser (which
creates an AST) -> walker (which writes output using StringTemplate)
Now I like to write all comments occurring in the source file to the
(nearly) same position in the destination file. So I have to pass the
comments to the walker. Of cause, I could simply put the comments into
the default token stream and add "Comment?" to every position in every
rule. This will make my parser and walker grammars unreadable.
Isn't there a better solution? Is it, for example, possible to scan
the token stream parallel while the AST is parsed? So it could be
possible to write comments to the StringTemplate output just after
they appear in the input stream at the nearly same position (using
token.index).
I know, that it is not quite clear where to put comments occurring in
the input stream. But it's not so important to keep the context. It's
more important to write the comments more or less to the same position.
Thanks for your help in advance.
Kind regards,
Chris
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