57 lines
1.4 KiB
Factor
57 lines
1.4 KiB
Factor
! Copyright (C) 2008 Slava Pestov, Eduardo Cavazos.
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! See http://factorcode.org/license.txt for BSD license.
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USING: kernel sequences combinators parser splitting math
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quotations arrays make words locals.backend summary sets ;
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IN: fry
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: _ ( -- * ) "Only valid inside a fry" throw ;
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: @ ( -- * ) "Only valid inside a fry" throw ;
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ERROR: >r/r>-in-fry-error ;
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<PRIVATE
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: [ncurry] ( n -- quot )
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{
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{ 0 [ [ ] ] }
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{ 1 [ [ curry ] ] }
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{ 2 [ [ 2curry ] ] }
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{ 3 [ [ 3curry ] ] }
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[ \ curry <repetition> ]
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} case ;
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M: >r/r>-in-fry-error summary
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drop
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"Explicit retain stack manipulation is not permitted in fried quotations" ;
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: check-fry ( quot -- quot )
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dup { load-local load-locals get-local drop-locals } intersect
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[ >r/r>-in-fry-error ] unless-empty ;
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PREDICATE: fry-specifier < word { _ @ } memq? ;
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GENERIC: count-inputs ( quot -- n )
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M: callable count-inputs [ count-inputs ] sigma ;
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M: fry-specifier count-inputs drop 1 ;
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M: object count-inputs drop 0 ;
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GENERIC: deep-fry ( obj -- )
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: shallow-fry ( quot -- quot' curry# )
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check-fry
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[ [ deep-fry ] each ] [ ] make
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[ dup \ @ = [ drop [ _ call ] ] [ 1array ] if ] map concat
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{ _ } split [ spread>quot ] [ length 1 - ] bi ;
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PRIVATE>
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: fry ( quot -- quot' ) shallow-fry [ncurry] swap prefix ;
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M: callable deep-fry
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[ count-inputs \ _ <repetition> % ] [ fry % ] bi ;
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M: object deep-fry , ;
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SYNTAX: '[ parse-quotation fry over push-all ;
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