[erlang-questions] Leex - a lexical anaylzer generator, released
Mon May 26 17:10:33 CEST 2008
2008/5/26 zambal <>:
> Hi Robert,
> I have totally no experience with lex or any other tools in this
> but out of curiosity I was reading lfe_scan.xrl and was wondering what
> these #' #` #; #, and #,@ separator rules are for. Are these just
> reserved for later use or are they part of some undocumented syntax?
These are taken from Scheme R6RS and will most likely go as LFE has no use
#' #` #, #,@ are for use in syntax-case macros and mean:
#' - (syntax ...)
#` - (quasisyntax ...)
#, - (unsyntax ...)
#,@ - (unsyntax-splicing ...)
#; - comment out next sepxr which could actually be useful
Also I missed #| ... |# for block comments. Might also be useful. Question
is if block comments are token or character based?
Be glad I didn't adopt R6RS symbol syntax, it is complex and full of special
cases. :-) I think having that if an (lisp) atom can be parsed as a number
then it is a number, else it is a symbol is much easier.
Glad you enjoy LFE.
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