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