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https://github.com/urbit/shrub.git
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140 lines
3.8 KiB
Plaintext
140 lines
3.8 KiB
Plaintext
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:::: /hoon/sole/lib
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::
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/? 310
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/- *sole
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::::
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::
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|_ sole-share :: shared-state engine
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++ abet +<
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++ apply
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|= ted/sole-edit
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^+ +>
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?- -.ted
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$del +>.$(buf (weld (scag p.ted buf) (slag +(p.ted) buf)))
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$ins +>.$(buf (weld (scag p.ted buf) `_buf`[q.ted (slag p.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)
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==
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::
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::::
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:: ++transmute: symmetric operational transformation.
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::
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:: for any sole state +>, obeys
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::
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:: =+ [x=(transmute a b) y=(transmute b a)]
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:: .= (apply:(apply a) x)
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:: (apply:(apply b) y)
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::
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++ transmute :: dex as after sin
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|= {sin/sole-edit dex/sole-edit}
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~| [%transmute sin dex]
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^- sole-edit
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?: ?=($mor -.sin)
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|- ^- sole-edit
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?~ p.sin dex
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$(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 sole-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 ?:((lth 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 +(p.dex)) dex)
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$ins ?: =(p.sin p.dex)
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?:((lth q.sin q.dex) dex dex(p +(p.dex)))
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?:((lte p.sin p.dex) dex(p +(p.dex)) dex)
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==
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==
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::
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++ commit :: local change
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|= ted/sole-edit
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^- sole-share
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abet:(apply(own.ven +(own.ven), leg [ted leg]) ted)
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::
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::::
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:: ++inverse: inverse of change in context.
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::
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:: for any sole state +>, obeys
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::
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:: =(+> (apply:(apply a) (inverse a)))
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::
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++ inverse :: relative inverse
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|= ted/sole-edit
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^- sole-edit
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=. ted ?.(?=({$mor * ~} ted) ted i.p.ted)
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?- -.ted
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$del [%ins p.ted (snag p.ted buf)]
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$ins [%del p.ted]
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$mor :- %mor
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%- flop
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|- ^- (list sole-edit)
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?~ p.ted ~
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:- ^$(ted i.p.ted)
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$(p.ted t.p.ted, +>.^$ (apply i.p.ted))
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$nop [%nop ~]
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$set [%set buf]
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==
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::
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++ receive :: naturalize event
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|= sole-change
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^- {sole-edit sole-share}
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?. &(=(his.ler his.ven) (lte own.ler own.ven))
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~& [%receive-sync his+[his.ler his.ven] own+[own.ler own.ven]]
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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) =(`@`0 haw) =(haw (sham buf)))
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=. leg (scag (sub own.ven own.ler) leg)
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:: ~? !=(own.ler own.ven) [%miss-leg leg]
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=+ dat=(transmute [%mor leg] ted)
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:: ~? !=(~ leg) [%transmute from+ted to+dat ~]
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[dat abet:(apply(his.ven +(his.ven)) dat)]
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::
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++ remit :: conditional accept
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|= {cal/sole-change ask/$-((list @c) ?)}
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^- {(unit sole-change) sole-share}
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=+ old=buf
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=^ dat +>+<.$ (receive cal)
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?: (ask buf)
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[~ +>+<.$]
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=^ lic +>+<.$ (transmit (inverse(buf old) dat))
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[`lic +>+<.$]
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::
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++ transmit :: outgoing change
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|= ted/sole-edit
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^- {sole-change sole-share}
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[[[his.ven own.ven] (sham buf) ted] (commit ted)]
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::
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++ transceive :: receive and invert
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|= sole-change
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^- {sole-edit sole-share}
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=+ old=buf
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=^ dat +>+<.$ (receive +<.$)
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[(inverse(buf old) dat) +>+<.$]
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::
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++ transpose :: adjust position
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|= pos/@ud
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=+ dat=(transmute [%mor leg] [%ins pos `@c`0])
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?> ?=($ins -.dat)
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p.dat
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--
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