49 lines
1.6 KiB
Factor
49 lines
1.6 KiB
Factor
! Copyright (C) 2008 James Cash
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! See http://factorcode.org/license.txt for BSD license.
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USING: kernel peg sequences arrays strings combinators.lib
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namespaces combinators math bake locals.private accessors vectors syntax lisp.parser ;
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IN: lisp
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DEFER: convert-form
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: convert-body ( s-exp -- quot )
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[ convert-form ] map reverse [ ] [ compose ] reduce ; inline
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: convert-if ( s-exp -- quot )
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1 tail [ convert-form ] map reverse first3 [ % , , if ] bake ;
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: convert-begin ( s-exp -- quot )
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1 tail convert-body ;
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: convert-cond ( s-exp -- quot )
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1 tail [ [ convert-body map ] map ] [ % cond ] bake ;
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: convert-general-form ( s-exp -- quot )
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unclip swap convert-body [ % , ] bake ;
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<PRIVATE
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: localize-body ( vars body -- newbody )
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[ dup lisp-symbol? [ tuck name>> swap member? [ name>> make-local ] [ ] if ]
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[ dup s-exp? [ body>> localize-body <s-exp> ] [ nip ] if ] if ] with map ;
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PRIVATE>
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: convert-lambda ( s-exp -- quot )
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first3 -rot nip [ body>> ] bi@ reverse [ name>> ] map dup make-locals dup push-locals
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[ swap localize-body convert-body ] dipd pop-locals swap <lambda> ;
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: convert-list-form ( s-exp -- quot )
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dup first dup lisp-symbol? [ name>>
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{ { "lambda" [ convert-lambda ] }
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{ "if" [ convert-if ] }
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{ "begin" [ convert-begin ] }
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{ "cond" [ convert-cond ] }
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[ drop convert-general-form ]
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} case ] [ drop convert-general-form ] if ;
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: convert-form ( lisp-form -- quot )
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{ { [ dup s-exp? ] [ body>> convert-list-form ] }
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[ [ , ] [ ] make ]
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} cond ;
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: lisp-string>factor ( str -- quot )
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lisp-expr parse-result-ast convert-form ; |