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### Controlling
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[
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Datatype continuations
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Funcon continuation
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Entity plug-signal
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Funcon hole
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Funcon resume-continuation
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Entity control-signal
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Funcon control
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Funcon delimit-current-continuation Alias delimit-cc
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]
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Meta-variables
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T, T1, T2 <: values
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Datatype
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continuations(T1,T2) ::= continuation(_:abstractions(()=>T2))
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/*
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`continuations(T1, T2)` consists of abstractions whose bodies contain a `hole`,
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and which will normally compute a value of type `T2` when the `hole` is plugged
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with a value of type `T1`.
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*/
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Entity
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_ --plug-signal(V?:values?)-> _
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/*
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A plug-signal contains the value to be filled into a `hole` in a continuation,
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thereby allowing a continuation to resume.
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*/
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Funcon
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hole : =>values
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/*
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A `hole` in a term cannot proceed until it receives a plug-signal
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containing a value to plug the hole.
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*/
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Rule
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hole --plug-signal(V)-> V
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Funcon
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resume-continuation(K:continuations(T1, T2), V:T1) : =>T2
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/*
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`resume-continuation(K, V)` resumes a continuation `K` by plugging the value
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`V` into the `hole` in the continuation.
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*/
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Rule
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X --plug-signal(V)-> X'
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---------------------------------------------------------------------------
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resume-continuation(continuation(abstraction(X)), V:T) --plug-signal()-> X'
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Entity
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_ --control-signal(F?:(functions(continuations(T1, T2), T2))?)-> _
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/*
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A control-signal contains the function to which control is about to be passed
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by the enclosing `delimit-current-continuation(X)`.
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*/
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Funcon
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control(F:functions(continuations(T1, T2), T2)) : =>T1
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/*
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`control(F)` emits a control-signal that, when handled by an enclosing
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`delimit-current-continuation(X)`, will apply `F` to the current continuation of
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`control(F)`, (rather than proceeding with that current continuation).
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*/
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Rule
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control(F:functions(_,_)) --control-signal(F)-> hole
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Funcon
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delimit-current-continuation(X:=>T) : =>T
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Alias
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delimit-cc = delimit-current-continuation
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/*
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`delimit-current-continuation(X)` delimits the scope of captured continuations.
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*/
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Rule
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delimit-current-continuation(V:T) ~> V
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Rule
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X --control-signal( )-> X'
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-----------------------------------------------------
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delimit-current-continuation(X) --control-signal( )->
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delimit-current-continuation(X')
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Rule
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X --control-signal(F)-> X'
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------------------------------------------------------------------
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delimit-current-continuation(X) --control-signal( )->
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delimit-current-continuation(apply(F, continuation closure(X')))
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131
IBAF-cbs/Funcons-beta/Computations/Abnormal/Controlling/index.md
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131
IBAF-cbs/Funcons-beta/Computations/Abnormal/Controlling/index.md
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---
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layout: default
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title: "Controlling"
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parent: Abnormal
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ancestor: Funcons-beta
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---
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[Funcons-beta] : [Controlling.cbs]
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-----------------------------
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### Controlling
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<div class="highlighter-rouge"><pre class="highlight"><code>[
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<i class="keyword">Datatype</i> <span class="name"><a href="#Name_continuations">continuations</a></span>
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<i class="keyword">Funcon</i> <span class="name"><a href="#Name_continuation">continuation</a></span>
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<i class="keyword">Entity</i> <span class="name"><a href="#Name_plug-signal">plug-signal</a></span>
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<i class="keyword">Funcon</i> <span class="name"><a href="#Name_hole">hole</a></span>
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<i class="keyword">Funcon</i> <span class="name"><a href="#Name_resume-continuation">resume-continuation</a></span>
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<i class="keyword">Entity</i> <span class="name"><a href="#Name_control-signal">control-signal</a></span>
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<i class="keyword">Funcon</i> <span class="name"><a href="#Name_control">control</a></span>
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<i class="keyword">Funcon</i> <span class="name"><a href="#Name_delimit-current-continuation">delimit-current-continuation</a></span> <i class="keyword">Alias</i> <span class="name"><a href="#Name_delimit-cc">delimit-cc</a></span>
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]</code></pre></div>
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Meta-variables</i>
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<span id="PartVariable_T"><i class="var">T</i></span>, <span id="PartVariable_T1"><i class="var">T<sub class="sub">1</sub></i></span>, <span id="PartVariable_T2"><i class="var">T<sub class="sub">2</sub></i></span> <: <span class="name"><a href="../../../Values/Value-Types/index.html#Name_values">values</a></span></code></pre></div>
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Datatype</i>
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<span class="name"><span id="Name_continuations">continuations</span></span>(<span id="Variable77_T1"><i class="var">T<sub class="sub">1</sub></i></span>,<span id="Variable84_T2"><i class="var">T<sub class="sub">2</sub></i></span>) ::= <span id="Name_continuation">continuation</span>(_:<span class="name"><a href="../../../Values/Abstraction/Generic/index.html#Name_abstractions">abstractions</a></span>(()=><span id="Variable108_T2"><i class="var">T<sub class="sub">2</sub></i></span>))</code></pre></div>
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<code><span class="name"><a href="#Name_continuations">continuations</a></span>(<i class="var">T<sub class="sub">1</sub></i>, <i class="var">T<sub class="sub">2</sub></i>)</code> consists of abstractions whose bodies contain a <code><span class="name"><a href="#Name_hole">hole</a></span></code>,
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and which will normally compute a value of type <code><i class="var">T<sub class="sub">2</sub></i></code> when the <code><span class="name"><a href="#Name_hole">hole</a></span></code> is plugged
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with a value of type <code><i class="var">T<sub class="sub">1</sub></i></code>.
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Entity</i>
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_ --<span class="ent-name"><span id="Name_plug-signal">plug-signal</span></span>(<i class="var">V<sup class="sup">?</sup></i>:<span class="name"><a href="../../../Values/Value-Types/index.html#Name_values">values</a></span><sup class="sup">?</sup>)-> _</code></pre></div>
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A plug-signal contains the value to be filled into a <code><span class="name"><a href="#Name_hole">hole</a></span></code> in a continuation,
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thereby allowing a continuation to resume.
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Funcon</i>
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<span class="name"><span id="Name_hole">hole</span></span> : =><span class="name"><a href="../../../Values/Value-Types/index.html#Name_values">values</a></span></code></pre></div>
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A <code><span class="name"><a href="#Name_hole">hole</a></span></code> in a term cannot proceed until it receives a plug-signal
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containing a value to plug the hole.
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Rule</i>
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<span class="name"><a href="#Name_hole">hole</a></span> --<span class="ent-name"><a href="#Name_plug-signal">plug-signal</a></span>(<i class="var">V</i>)-> <i class="var">V</i></code></pre></div>
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Funcon</i>
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<span class="name"><span id="Name_resume-continuation">resume-continuation</span></span>(<span id="Variable304_K"><i class="var">K</i></span>:<span class="name"><a href="#Name_continuations">continuations</a></span>(<span id="Variable310_T1"><i class="var">T<sub class="sub">1</sub></i></span>, <span id="Variable316_T2"><i class="var">T<sub class="sub">2</sub></i></span>), <span id="Variable331_V"><i class="var">V</i></span>:<span id="Variable336_T1"><i class="var">T<sub class="sub">1</sub></i></span>) : =><span id="Variable352_T2"><i class="var">T<sub class="sub">2</sub></i></span></code></pre></div>
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<code><span class="name"><a href="#Name_resume-continuation">resume-continuation</a></span>(<i class="var">K</i>, <i class="var">V</i>)</code> resumes a continuation <code><i class="var">K</i></code> by plugging the value
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<code><i class="var">V</i></code> into the <code><span class="name"><a href="#Name_hole">hole</a></span></code> in the continuation.
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Rule</i>
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<a href="#Variable469_X"><i class="var">X</i></a> --<span class="ent-name"><a href="#Name_plug-signal">plug-signal</a></span>(<span id="Variable437_V"><i class="var">V</i></span>)-> <span id="Variable454_X'"><i class="var">X′</i></span>
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---------------------------------------------------------------------------
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<span class="name"><a href="#Name_resume-continuation">resume-continuation</a></span>(<span class="name"><a href="#Name_continuation">continuation</a></span>(<span class="name"><a href="../../../Values/Abstraction/Generic/index.html#Name_abstraction">abstraction</a></span>(<span id="Variable469_X"><i class="var">X</i></span>)), <span id="Variable486_V"><i class="var">V</i></span>:<i class="var">T</i>) --<span class="ent-name"><a href="#Name_plug-signal">plug-signal</a></span>()-> <a href="#Variable454_X'"><i class="var">X′</i></a></code></pre></div>
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Entity</i>
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_ --<span class="ent-name"><span id="Name_control-signal">control-signal</span></span>(<i class="var">F<sup class="sup">?</sup></i>:(<span class="name"><a href="../../../Values/Abstraction/Functions/index.html#Name_functions">functions</a></span>(<span class="name"><a href="#Name_continuations">continuations</a></span>(<i class="var">T<sub class="sub">1</sub></i>, <i class="var">T<sub class="sub">2</sub></i>), <i class="var">T<sub class="sub">2</sub></i>))<sup class="sup">?</sup>)-> _</code></pre></div>
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A control-signal contains the function to which control is about to be passed
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by the enclosing <code><span class="name"><a href="#Name_delimit-current-continuation">delimit-current-continuation</a></span>(<i class="var">X</i>)</code>.
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Funcon</i>
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<span class="name"><span id="Name_control">control</span></span>(<span id="Variable606_F"><i class="var">F</i></span>:<span class="name"><a href="../../../Values/Abstraction/Functions/index.html#Name_functions">functions</a></span>(<span class="name"><a href="#Name_continuations">continuations</a></span>(<span id="Variable613_T1"><i class="var">T<sub class="sub">1</sub></i></span>, <span id="Variable619_T2"><i class="var">T<sub class="sub">2</sub></i></span>), <span id="Variable632_T2"><i class="var">T<sub class="sub">2</sub></i></span>)) : =><span id="Variable654_T1"><i class="var">T<sub class="sub">1</sub></i></span></code></pre></div>
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<code><span class="name"><a href="#Name_control">control</a></span>(<i class="var">F</i>)</code> emits a control-signal that, when handled by an enclosing
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<code><span class="name"><a href="#Name_delimit-current-continuation">delimit-current-continuation</a></span>(<i class="var">X</i>)</code>, will apply <code><i class="var">F</i></code> to the current continuation of
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<code><span class="name"><a href="#Name_control">control</a></span>(<i class="var">F</i>)</code>, (rather than proceeding with that current continuation).
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Rule</i>
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<span class="name"><a href="#Name_control">control</a></span>(<span id="Variable743_F"><i class="var">F</i></span>:<span class="name"><a href="../../../Values/Abstraction/Functions/index.html#Name_functions">functions</a></span>(_,_)) --<span class="ent-name"><a href="#Name_control-signal">control-signal</a></span>(<a href="#Variable743_F"><i class="var">F</i></a>)-> <span class="name"><a href="#Name_hole">hole</a></span></code></pre></div>
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Funcon</i>
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<span class="name"><span id="Name_delimit-current-continuation">delimit-current-continuation</span></span>(<span id="Variable797_X"><i class="var">X</i></span>:=><span id="Variable802_T"><i class="var">T</i></span>) : =><span id="Variable817_T"><i class="var">T</i></span>
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<i class="keyword">Alias</i>
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<span class="name"><span id="Name_delimit-cc">delimit-cc</span></span> = <span class="name"><a href="#Name_delimit-current-continuation">delimit-current-continuation</a></span></code></pre></div>
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<code><span class="name"><a href="#Name_delimit-current-continuation">delimit-current-continuation</a></span>(<i class="var">X</i>)</code> delimits the scope of captured continuations.
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Rule</i>
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<span class="name"><a href="#Name_delimit-current-continuation">delimit-current-continuation</a></span>(<span id="Variable855_V"><i class="var">V</i></span>:<i class="var">T</i>) ~> <a href="#Variable855_V"><i class="var">V</i></a>
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<i class="keyword">Rule</i>
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<a href="#Variable913_X"><i class="var">X</i></a> --<span class="ent-name"><a href="#Name_control-signal">control-signal</a></span>( )-> <span id="Variable900_X'"><i class="var">X′</i></span>
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-----------------------------------------------------
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<span class="name"><a href="#Name_delimit-current-continuation">delimit-current-continuation</a></span>(<span id="Variable913_X"><i class="var">X</i></span>) --<span class="ent-name"><a href="#Name_control-signal">control-signal</a></span>( )->
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<span class="name"><a href="#Name_delimit-current-continuation">delimit-current-continuation</a></span>(<a href="#Variable900_X'"><i class="var">X′</i></a>)
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<i class="keyword">Rule</i>
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<a href="#Variable993_X"><i class="var">X</i></a> --<span class="ent-name"><a href="#Name_control-signal">control-signal</a></span>(<span id="Variable963_F"><i class="var">F</i></span>)-> <span id="Variable980_X'"><i class="var">X′</i></span>
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------------------------------------------------------------------
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<span class="name"><a href="#Name_delimit-current-continuation">delimit-current-continuation</a></span>(<span id="Variable993_X"><i class="var">X</i></span>) --<span class="ent-name"><a href="#Name_control-signal">control-signal</a></span>( )->
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<span class="name"><a href="#Name_delimit-current-continuation">delimit-current-continuation</a></span>(<span class="name"><a href="../../../Values/Abstraction/Functions/index.html#Name_apply">apply</a></span>(<a href="#Variable963_F"><i class="var">F</i></a>, <span class="name"><a href="#Name_continuation">continuation</a></span> <span class="name"><a href="../../../Values/Abstraction/Generic/index.html#Name_closure">closure</a></span>(<a href="#Variable980_X'"><i class="var">X′</i></a>)))</code></pre></div>
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____
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From the [PLanCompS Project] | [CBS-beta issues...] | [Suggest an improvement...]
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[Controlling.cbs]: Controlling.cbs
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"CBS SOURCE FILE"
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||||
[Funcons-beta]: /CBS-beta/docs/Funcons-beta
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||||
"FUNCONS-BETA"
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||||
[Unstable-Funcons-beta]: /CBS-beta/docs/Unstable-Funcons-beta
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||||
"UNSTABLE-FUNCONS-BETA"
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[Languages-beta]: /CBS-beta/docs/Languages-beta
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||||
"LANGUAGES-BETA"
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||||
[Unstable-Languages-beta]: /CBS-beta/docs/Unstable-Languages-beta
|
||||
"UNSTABLE-LANGUAGES-BETA"
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||||
[CBS-beta]: /CBS-beta "CBS-BETA"
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[PLanCompS Project]: https://plancomps.github.io
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"PROGRAMMING LANGUAGE COMPONENTS AND SPECIFICATIONS PROJECT HOME PAGE"
|
||||
[CBS-beta issues...]: https://github.com/plancomps/CBS-beta/issues
|
||||
"CBS-BETA ISSUE REPORTS ON GITHUB"
|
||||
[Suggest an improvement...]: mailto:plancomps@gmail.com?Subject=CBS-beta%20-%20comment&Body=Re%3A%20CBS-beta%20specification%20at%20Computations/Abnormal/Controlling/Controlling.cbs%0A%0AComment/Query/Issue/Suggestion%3A%0A%0A%0ASignature%3A%0A
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"GENERATE AN EMAIL TEMPLATE"
|
||||
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