40 lines
1023 B
Factor
40 lines
1023 B
Factor
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! 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
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quotations ;
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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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: _ "Only valid inside a fry" throw ;
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DEFER: (fry)
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: ((fry)) ( accum quot adder -- result )
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>r [ ] swap (fry) r>
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append swap dup empty? [ drop ] [
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[ swap compose ] curry append
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] if ; inline
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: (fry) ( accum quot -- result )
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dup empty? [
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drop 1quotation
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] [
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unclip {
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{ , [ [ curry ] ((fry)) ] }
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{ @ [ [ compose ] ((fry)) ] }
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[ swap >r add r> (fry) ]
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} case
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] if ;
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: trivial-fry ( quot -- quot' ) [ ] swap (fry) ;
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: fry ( quot -- quot' )
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{ _ } last-split1 [
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>r fry [ [ dip ] curry ] r> trivial-fry [ compose ] compose 3compose
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] [
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trivial-fry
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] if* ;
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: '[ \ ] parse-until fry over push-all ; parsing
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