29 lines
819 B
Factor
29 lines
819 B
Factor
! Copyright (C) 2008 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: lexer sets sequences kernel splitting effects
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combinators arrays parser ;
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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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: parse-effect-token ( end -- token/f )
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scan [ nip ] [ = ] 2bi [ drop f ] [
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dup { f "(" "((" } member? [ bad-effect ] [
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":" ?tail [
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scan-word {
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{ \ ( [ ")" parse-effect ] }
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[ ]
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} case 2array
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] when
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] if
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] if ;
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: parse-effect-tokens ( end -- tokens )
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[ parse-effect-token dup ] curry [ ] [ drop ] produce ;
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: parse-effect ( end -- effect )
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parse-effect-tokens { "--" } split1 dup
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[ <effect> ] [ "Stack effect declaration must contain --" throw ] if ;
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