71 lines
2.0 KiB
Factor
71 lines
2.0 KiB
Factor
! Copyright (C) 2008, 2010 Slava Pestov.
|
|
! See http://factorcode.org/license.txt for BSD license.
|
|
USING: arrays combinators effects kernel lexer make namespaces
|
|
parser sequences splitting words ;
|
|
IN: effects.parser
|
|
|
|
DEFER: parse-effect
|
|
|
|
ERROR: bad-effect ;
|
|
ERROR: invalid-row-variable ;
|
|
ERROR: row-variable-can't-have-type ;
|
|
ERROR: stack-effect-omits-dashes ;
|
|
|
|
SYMBOL: effect-var
|
|
|
|
<PRIVATE
|
|
: end-token? ( end token -- token ? ) [ nip ] [ = ] 2bi ; inline
|
|
: effect-opener? ( token -- token ? ) dup { f "(" "((" "--" } member? ; inline
|
|
: effect-closer? ( token -- token ? ) dup { ")" "))" } member? ; inline
|
|
: row-variable? ( token -- token' ? ) ".." ?head ; inline
|
|
|
|
: parse-effect-var ( first? var name -- var )
|
|
nip
|
|
[ ":" ?tail [ row-variable-can't-have-type ] when ] curry
|
|
[ invalid-row-variable ] if ;
|
|
|
|
: parse-effect-value ( token -- value )
|
|
":" ?tail [ scan-object 2array ] when ;
|
|
PRIVATE>
|
|
|
|
: parse-effect-token ( first? var end -- var more? )
|
|
scan-token {
|
|
{ [ end-token? ] [ drop nip f ] }
|
|
{ [ effect-opener? ] [ bad-effect ] }
|
|
{ [ effect-closer? ] [ stack-effect-omits-dashes ] }
|
|
{ [ row-variable? ] [ parse-effect-var t ] }
|
|
[ [ drop ] 2dip parse-effect-value , t ]
|
|
} cond ;
|
|
|
|
: parse-effect-tokens ( end -- var tokens )
|
|
[
|
|
[ t f ] dip [ parse-effect-token [ f ] 2dip ] curry [ ] while nip
|
|
] { } make ;
|
|
|
|
: parse-effect ( end -- effect )
|
|
[ "--" parse-effect-tokens ] dip parse-effect-tokens
|
|
<variable-effect> ;
|
|
|
|
: scan-effect ( -- effect )
|
|
"(" expect ")" parse-effect ;
|
|
|
|
: parse-call( ( accum word -- accum )
|
|
[ ")" parse-effect ] dip 2array append! ;
|
|
|
|
SYMBOL: in-definition
|
|
|
|
ERROR: can't-nest-definitions word ;
|
|
|
|
: check-in-definition ( -- )
|
|
in-definition get [ word can't-nest-definitions ] when ;
|
|
|
|
: with-definition ( quot -- )
|
|
[ check-in-definition t in-definition ] dip with-variable ; inline
|
|
|
|
: (:) ( -- word def effect )
|
|
[
|
|
scan-new-word
|
|
scan-effect
|
|
parse-definition swap
|
|
] with-definition ;
|