91 lines
2.8 KiB
Factor
91 lines
2.8 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 locals.private accessors
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vectors syntax lisp.parser assocs parser sequences.lib ;
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IN: lisp
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DEFER: convert-form
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DEFER: funcall
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! Functions to convert s-exps to quotations
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! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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: convert-body ( s-exp -- quot )
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[ convert-form ] map [ ] [ compose ] reduce ; inline
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: convert-if ( s-exp -- quot )
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rest [ convert-form ] map reverse first3 [ % , , if ] bake ;
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: convert-begin ( s-exp -- quot )
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rest convert-form ;
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: convert-cond ( s-exp -- quot )
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rest [ [ convert-form map ] map ] [ % cond ] bake ;
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: convert-general-form ( s-exp -- quot )
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unclip convert-form swap convert-body [ , % funcall ] bake ;
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<PRIVATE
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: localize-body ( assoc body -- assoc newbody )
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[ dup lisp-symbol? [ over dupd [ name>> ] dip at swap or ]
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[ dup s-exp? [ body>> localize-body <s-exp> ] when ] if
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] map ;
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: localize-lambda ( body vars -- newbody newvars )
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make-locals dup push-locals swap
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[ swap localize-body <s-exp> convert-form swap pop-locals ] dip swap ;
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PRIVATE>
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: split-lambda ( s-exp -- body vars )
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first3 -rot nip [ body>> ] bi@ [ name>> ] map ; inline
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: rest-lambda ( body vars -- quot )
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"&rest" swap [ remove ] [ index ] 2bi
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[ localize-lambda <lambda> ] dip
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[ , cut swap [ % , ] bake , compose ] bake ;
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: normal-lambda ( body vars -- quot )
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localize-lambda <lambda> [ , compose ] bake ;
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: convert-lambda ( s-exp -- quot )
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split-lambda dup "&rest" swap member? [ rest-lambda ] [ normal-lambda ] if ;
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: convert-quoted ( s-exp -- quot )
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second [ , ] bake ;
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: convert-list-form ( s-exp -- quot )
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dup first dup lisp-symbol?
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[ name>>
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{ { "lambda" [ convert-lambda ] }
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{ "quote" [ convert-quoted ] }
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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 ]
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[ 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 ] if ;
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: lisp-string>factor ( str -- quot )
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lisp-expr parse-result-ast convert-form lambda-rewrite call ;
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! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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SYMBOL: lisp-env
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ERROR: no-such-var var ;
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: init-env ( -- )
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H{ } clone lisp-env set ;
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: lisp-define ( name quot -- )
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swap lisp-env get set-at ;
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: lisp-get ( name -- word )
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dup lisp-env get at [ ] [ no-such-var ] ?if ;
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: funcall ( quot sym -- * )
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dup lisp-symbol? [ name>> lisp-get ] when call ; inline |