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90 lines
2.5 KiB
Plaintext
90 lines
2.5 KiB
Plaintext
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:::: /hook/core/console/lib
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:: This file is in the public domain.
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/? 310
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/- *console
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::
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::::
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::
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|%
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++ cs :: shared-state engine
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|_ [pos=@ud console-share]
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++ abet +<
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++ apply
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|= ted=console-edit
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^+ +>
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?- -.ted
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%del +>.$(buf (weld (scag p.ted buf) (slag 1 buf)))
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%ins +>.$(buf (weld (scag p.ted buf) `_buf`[q.ted buf]))
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%mor |- ^+ +>.^$
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?~ p.ted
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+>.^$
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$(p.ted t.p.ted, +>.$ ^$(ted i.p.ted))
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%nop +>.$
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%set +>.$(buf p.ted, pos (lent p.ted))
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==
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::
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:: symmetric operational transformation. for any console state, obeys
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::
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:: =+ [x=(transmute a b) y=(transmute b a)]
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:: .= (edit-apply:(edit-apply x) b)
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:: (edit-apply:(edit-apply a) y)
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::
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++ transmute :: dex as after sin
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|= [sin=console-edit dex=console-edit]
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^- console-edit
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?: ?=(%mor -.sin)
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|- ^- console-edit
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?~ p.sin dex
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$(p.sin t.p.sin, dex ^$(sin i.p.sin))
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::
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?: ?=(%mor -.dex)
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:- %mor
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|- ^- (list console-edit)
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?~ p.dex ~
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[^$(dex i.p.dex) $(p.dex t.p.dex)]
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::
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?: |(?=(%nop -.sin) ?=(%nop -.dex)) dex
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?: ?=(%set -.sin) [%nop ~]
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?: ?=(%set -.dex) dex
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::
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?- -.sin
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%del
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?- -.dex
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%del ?: =(p.sin p.dex) [%nop ~]
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?:((lth p.sin p.dex) dex(p (dec p.dex)) dex)
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%ins ?:((lte p.sin p.dex) dex(p (dec p.dex)) dex)
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==
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::
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%ins
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?- -.dex
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%del ?:((lte p.sin p.dex) dex(p (inc p.dex)) dex)
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%ins ?: =(p.sin p.dex)
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?:((gth q.sin q.dex) dex dex(p (inc p.dex)))
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?:((lte p.sin p.dex) dex(p (inc p.dex)) dex)
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==
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==
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::
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++ commit
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|= ted=console-edit
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^+ +>
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(apply(own.ven +(own.ven)) ted)
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::
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++ receive :: edit from other
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|= $: ler=console-clock :: other's clock view
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haw=@uvH :: hash at edit
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ted=console-edit :: edit content
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==
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^+ +>
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?> &(=(his.ler his.ven) (lte own.ler own.ven))
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?> |(!=(own.ler own.ven) =(haw (sham buf)))
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=: his.ven +(his.ven)
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own.ven +(own.ven)
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leg (scag (sub own.ven own.ler) leg)
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==
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(apply (transmute [%mor leg] ted))
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--
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--
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