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Peter
2023-11-01 09:29:33 +01:00
parent 448147e7da
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58
IBAF-cbs/Funcons-beta/Computations/Normal/Generating/Generating.cbs Normal file
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### Generating
[
Type atoms
Entity used-atom-set
Funcon initialise-generating
Funcon fresh-atom
Funcon use-atom-not-in
]
Meta-variables
T <: values
Built-in Type
atoms
/*
`atoms` is the type of values used as distinguishable tags.
Notation for individual atoms is not provided.
*/
Entity
< _ , used-atom-set(_:sets(atoms)) > ---> < _ , used-atom-set(_:sets(atoms)) >
Built-in Funcon
initialise-generating(_:=>T) : =>T
/*
The initial value of the `used-atom-set(SA)` entity is unspecified. It could
contains atoms that are reserved for internal use.
*/
Funcon
fresh-atom : =>atoms
/*
`fresh-atom` computes an atom distinct from all previously computed atoms.
*/
Rule
element-not-in(atoms, SA) ~> A
-----------------------------------------------
< fresh-atom , used-atom-set(SA) >
---> < A , used-atom-set(set-insert(A, SA)) >
Funcon
use-atom-not-in(_:sets(atoms)) : =>atoms
/*
`use-atom-not-in(SA)` computes an atom not in the set `SA`, and inserts it
in the `used-atom-set(SA')` entity, in case it was not previously used.
*/
Rule
element-not-in(atoms, SA) ~> A
--------------------------------------------------------
< use-atom-not-in(SA:sets(atoms)) , used-atom-set(SA') >
---> < A , used-atom-set(set-insert(A, SA')) >

97
IBAF-cbs/Funcons-beta/Computations/Normal/Generating/index.md Normal file
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---
layout: default
title: "Generating"
parent: Normal
ancestor: Funcons-beta
---
[Funcons-beta] : [Generating.cbs]
-----------------------------
### Generating
<div class="highlighter-rouge"><pre class="highlight"><code>[
<i class="keyword">Type</i> <span class="name"><a href="#Name_atoms">atoms</a></span>
<i class="keyword">Entity</i> <span class="name"><a href="#Name_used-atom-set">used-atom-set</a></span>
<i class="keyword">Funcon</i> <span class="name"><a href="#Name_initialise-generating">initialise-generating</a></span>
<i class="keyword">Funcon</i> <span class="name"><a href="#Name_fresh-atom">fresh-atom</a></span>
<i class="keyword">Funcon</i> <span class="name"><a href="#Name_use-atom-not-in">use-atom-not-in</a></span>
]</code></pre></div>
<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Meta-variables</i>
<span id="PartVariable_T"><i class="var">T</i></span> <: <span class="name"><a href="../../../Values/Value-Types/index.html#Name_values">values</a></span></code></pre></div>
<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Built-in</i> <i class="keyword">Type</i>
<span class="name"><span id="Name_atoms">atoms</span></span></code></pre></div>
<code><span class="name"><a href="#Name_atoms">atoms</a></span></code> is the type of values used as distinguishable tags.
Notation for individual atoms is not provided.
<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Entity</i>
< _ , <span class="ent-name"><span id="Name_used-atom-set">used-atom-set</span></span>(_:<span class="name"><a href="../../../Values/Composite/Sets/index.html#Name_sets">sets</a></span>(<span class="name"><a href="#Name_atoms">atoms</a></span>)) > ---> < _ , <span class="ent-name">used-atom-set</span>(_:<span class="name">sets</span>(<span class="name">atoms</span>)) ></code></pre></div>
<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Built-in</i> <i class="keyword">Funcon</i>
<span class="name"><span id="Name_initialise-generating">initialise-generating</span></span>(_:=><span id="Variable108_T"><i class="var">T</i></span>) : =><span id="Variable123_T"><i class="var">T</i></span></code></pre></div>
The initial value of the <code><span class="name"><a href="#Name_used-atom-set">used-atom-set</a></span>(<i class="var">SA</i>)</code> entity is unspecified. It could
contains atoms that are reserved for internal use.
<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Funcon</i>
<span class="name"><span id="Name_fresh-atom">fresh-atom</span></span> : =><span class="name"><a href="#Name_atoms">atoms</a></span></code></pre></div>
<code><span class="name"><a href="#Name_fresh-atom">fresh-atom</a></span></code> computes an atom distinct from all previously computed atoms.
<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Rule</i>
<span class="name"><a href="../../../Values/Composite/Sets/index.html#Name_element-not-in">element-not-in</a></span>(<span class="name"><a href="#Name_atoms">atoms</a></span>, <a href="#Variable211_SA"><i class="var">SA</i></a>) ~> <span id="Variable197_A"><i class="var">A</i></span>
-----------------------------------------------
< <span class="name"><a href="#Name_fresh-atom">fresh-atom</a></span> , <span class="ent-name"><a href="#Name_used-atom-set">used-atom-set</a></span>(<span id="Variable211_SA"><i class="var">SA</i></span>) >
---> < <a href="#Variable197_A"><i class="var">A</i></a> , <span class="ent-name"><a href="#Name_used-atom-set">used-atom-set</a></span>(<span class="name"><a href="../../../Values/Composite/Sets/index.html#Name_set-insert">set-insert</a></span>(<a href="#Variable197_A"><i class="var">A</i></a>, <a href="#Variable211_SA"><i class="var">SA</i></a>)) ></code></pre></div>
<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Funcon</i>
<span class="name"><span id="Name_use-atom-not-in">use-atom-not-in</span></span>(_:<span class="name"><a href="../../../Values/Composite/Sets/index.html#Name_sets">sets</a></span>(<span class="name"><a href="#Name_atoms">atoms</a></span>)) : =><span class="name"><a href="#Name_atoms">atoms</a></span></code></pre></div>
<code><span class="name"><a href="#Name_use-atom-not-in">use-atom-not-in</a></span>(<i class="var">SA</i>)</code> computes an atom not in the set <code><i class="var">SA</i></code>, and inserts it
in the <code><span class="name"><a href="#Name_used-atom-set">used-atom-set</a></span>(<i class="var">SA&prime;</i>)</code> entity, in case it was not previously used.
<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Rule</i>
<span class="name"><a href="../../../Values/Composite/Sets/index.html#Name_element-not-in">element-not-in</a></span>(<span class="name"><a href="#Name_atoms">atoms</a></span>, <a href="#Variable379_SA"><i class="var">SA</i></a>) ~> <span id="Variable367_A"><i class="var">A</i></span>
--------------------------------------------------------
< <span class="name"><a href="#Name_use-atom-not-in">use-atom-not-in</a></span>(<span id="Variable379_SA"><i class="var">SA</i></span>:<span class="name"><a href="../../../Values/Composite/Sets/index.html#Name_sets">sets</a></span>(<span class="name"><a href="#Name_atoms">atoms</a></span>)) , <span class="ent-name"><a href="#Name_used-atom-set">used-atom-set</a></span>(<span id="Variable402_SA'"><i class="var">SA&prime;</i></span>) >
---> < <a href="#Variable367_A"><i class="var">A</i></a> , <span class="ent-name"><a href="#Name_used-atom-set">used-atom-set</a></span>(<span class="name"><a href="../../../Values/Composite/Sets/index.html#Name_set-insert">set-insert</a></span>(<a href="#Variable367_A"><i class="var">A</i></a>, <a href="#Variable402_SA'"><i class="var">SA&prime;</i></a>)) ></code></pre></div>
____
From the [PLanCompS Project] | [CBS-beta issues...] | [Suggest an improvement...]
[Generating.cbs]: Generating.cbs
"CBS SOURCE FILE"
[Funcons-beta]: /CBS-beta/docs/Funcons-beta
"FUNCONS-BETA"
[Unstable-Funcons-beta]: /CBS-beta/docs/Unstable-Funcons-beta
"UNSTABLE-FUNCONS-BETA"
[Languages-beta]: /CBS-beta/docs/Languages-beta
"LANGUAGES-BETA"
[Unstable-Languages-beta]: /CBS-beta/docs/Unstable-Languages-beta
"UNSTABLE-LANGUAGES-BETA"
[CBS-beta]: /CBS-beta "CBS-BETA"
[PLanCompS Project]: https://plancomps.github.io
"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/Normal/Generating/Generating.cbs%0A%0AComment/Query/Issue/Suggestion%3A%0A%0A%0ASignature%3A%0A
"GENERATE AN EMAIL TEMPLATE"

11
IBAF-cbs/Funcons-beta/Computations/Normal/Generating/tests/fresh-atom.config Normal file
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general {
funcon-term:
initialise-generating
give(fresh-atom,
check-true not is-equal(given, fresh-atom))
;
}
tests {
result-term: null-value;
}

14
IBAF-cbs/Funcons-beta/Computations/Normal/Generating/tests/use-atom-not-in.config Normal file
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general {
funcon-term:
initialise-generating
give(fresh-atom,
print is-equal(use-atom-not-in{given}, use-atom-not-in{given}))
;
}
tests {
result-term: null-value;
// standard-out: [ false ];
//Also possible:
standard-out: [ true ];
}