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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Location Requirements</title>
<link href="../docs-assets/Breadcrumbs.css" rel="stylesheet" rev="stylesheet" type="text/css">
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<h1><a href="../index.html">
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<main role="main">
<!--Weave of 'Location Requirements' generated by Inweb-->
<div class="breadcrumbs">
<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../intern.html">Inter Modules</a></li><li><a href="index.html">building</a></li><li><a href="index.html#1">Chapter 1: Architecture</a></li><li><b>Location Requirements</b></li></ul></div>
<p class="purpose">A way to express rules for the permitted places where inames and packages are allowed to appear in the Inter hierarchy.</p>
<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. </b>As seen in <a href="1-hl.html" class="internal">Hierarchy Locations</a>, each <a href="1-hl.html#SP1" class="internal">hierarchy_location</a> and
<a href="1-hl.html#SP16" class="internal">hierarchy_attachment_point</a> stipulates something about where its resource
(an iname, a package) can aopear in the hierarchy. For example, that might be
"only in <span class="extract"><span class="extract-syntax">/main/ingredients</span></span>", or "only in a package of type <span class="extract"><span class="extract-syntax">_recipe</span></span>".
</p>
<p class="commentary">A variety of stipulations can be made, and with memory consumption unimportant
here, the following is really a union: almost all the fields will be left blank.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">location_requirement</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">submodule_identity</span><span class="plain-syntax"> *</span><span class="identifier-syntax">any_submodule_package_of_this_identity</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">package_request</span><span class="plain-syntax"> *</span><span class="identifier-syntax">this_exact_package</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">this_exact_package_not_yet_created</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">any_package_of_this_type</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">any_enclosure</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">must_be_plug</span><span class="plain-syntax">;</span>
<span class="plain-syntax">} </span><span class="reserved-syntax">location_requirement</span><span class="plain-syntax">;</span>
<span class="reserved-syntax">location_requirement</span><span class="plain-syntax"> </span><span class="function-syntax">LocationRequirements::blank</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">LocationRequirements::blank</span></span>:<br/><a href="1-lr.html#SP2">&#167;2</a>, <a href="1-lr.html#SP3">&#167;3</a>, <a href="1-lr.html#SP4">&#167;4</a>, <a href="1-lr.html#SP6">&#167;6</a>, <a href="1-lr.html#SP7">&#167;7</a>, <a href="1-lr.html#SP8">&#167;8</a>, <a href="1-lr.html#SP9">&#167;9</a>, <a href="1-lr.html#SP10">&#167;10</a>, <a href="1-lr.html#SP11">&#167;11</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">location_requirement</span><span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax">.</span><span class="element-syntax">any_submodule_package_of_this_identity</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax">.</span><span class="element-syntax">this_exact_package</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax">.</span><span class="element-syntax">this_exact_package_not_yet_created</span><span class="plain-syntax"> = -1;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax">.</span><span class="element-syntax">any_package_of_this_type</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax">.</span><span class="element-syntax">any_enclosure</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax">.</span><span class="element-syntax">must_be_plug</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<ul class="endnotetexts"><li>The structure location_requirement is accessed in 1/hl and here.</li></ul>
<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>&#167;2. </b>"You must put me in package <span class="extract"><span class="extract-syntax">P</span></span>."
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">location_requirement</span><span class="plain-syntax"> </span><span class="function-syntax">LocationRequirements::this_package</span><button class="popup" onclick="togglePopup('usagePopup2')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup2">Usage of <span class="code-font"><span class="function-syntax">LocationRequirements::this_package</span></span>:<br/><a href="1-lr.html#SP5">&#167;5</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">package_request</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">location_requirement</span><span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax"> = </span><a href="1-lr.html#SP1" class="function-link"><span class="function-syntax">LocationRequirements::blank</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax">.</span><span class="element-syntax">this_exact_package</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>&#167;3. </b>"You can put me in any package of this type."
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">location_requirement</span><span class="plain-syntax"> </span><span class="function-syntax">LocationRequirements::any_package_of_type</span><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ptype_name</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">location_requirement</span><span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax"> = </span><a href="1-lr.html#SP1" class="function-link"><span class="function-syntax">LocationRequirements::blank</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax">.</span><span class="element-syntax">any_package_of_this_type</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::duplicate</span><span class="plain-syntax">(</span><span class="identifier-syntax">ptype_name</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>&#167;4. </b>"You can put me in any enclosing package." (See <a href="1-ls.html#SP18" class="internal">LargeScale::package_type</a>
for what this means.)
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">location_requirement</span><span class="plain-syntax"> </span><span class="function-syntax">LocationRequirements::any_enclosure</span><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">location_requirement</span><span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax"> = </span><a href="1-lr.html#SP1" class="function-link"><span class="function-syntax">LocationRequirements::blank</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax">.</span><span class="element-syntax">any_enclosure</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>&#167;5. </b>"You must put me in <span class="extract"><span class="extract-syntax">/main/architectural</span></span>."
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">location_requirement</span><span class="plain-syntax"> </span><span class="function-syntax">LocationRequirements::architectural_package</span><span class="plain-syntax">(</span><span class="identifier-syntax">inter_tree</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="1-lr.html#SP2" class="function-link"><span class="function-syntax">LocationRequirements::this_package</span></a><span class="plain-syntax">(</span><a href="1-ls.html#SP7" class="function-link"><span class="function-syntax">LargeScale::architecture_request</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">));</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>&#167;6. </b>"You must put me in <span class="extract"><span class="extract-syntax">/main/connectors</span></span>, as a plug."
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">location_requirement</span><span class="plain-syntax"> </span><span class="function-syntax">LocationRequirements::plug</span><button class="popup" onclick="togglePopup('usagePopup3')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup3">Usage of <span class="code-font"><span class="function-syntax">LocationRequirements::plug</span></span>:<br/>Hierarchy Locations - <a href="1-hl.html#SP20">&#167;20</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">location_requirement</span><span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax"> = </span><a href="1-lr.html#SP1" class="function-link"><span class="function-syntax">LocationRequirements::blank</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax">.</span><span class="element-syntax">must_be_plug</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>&#167;7. </b>"You must put me in a submodule, identified by <span class="extract"><span class="extract-syntax">sid</span></span>, of some module." In
practice, <a href="../inform7/index.html" class="internal">inform7</a> uses this to place material in the module associated with
the compilation unit where the material came from &mdash; the source text, or a
particular extension &mdash; and this is why the term "local" is used.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">location_requirement</span><span class="plain-syntax"> </span><span class="function-syntax">LocationRequirements::local_submodule</span><span class="plain-syntax">(</span><span class="reserved-syntax">submodule_identity</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sid</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">location_requirement</span><span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax"> = </span><a href="1-lr.html#SP1" class="function-link"><span class="function-syntax">LocationRequirements::blank</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax">.</span><span class="element-syntax">any_submodule_package_of_this_identity</span><span class="plain-syntax"> = </span><span class="identifier-syntax">sid</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP8" class="paragraph-anchor"></a><b>&#167;8. </b>"You must put me in a submodule, identified by <span class="extract"><span class="extract-syntax">sid</span></span>, of the generic module."
So, for example, in <span class="extract"><span class="extract-syntax">/main/generic/properties</span></span>, where <span class="extract"><span class="extract-syntax">properties</span></span> is the
submodule.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">location_requirement</span><span class="plain-syntax"> </span><span class="function-syntax">LocationRequirements::generic_submodule</span><span class="plain-syntax">(</span><span class="identifier-syntax">inter_tree</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">submodule_identity</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sid</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">location_requirement</span><span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax"> = </span><a href="1-lr.html#SP1" class="function-link"><span class="function-syntax">LocationRequirements::blank</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax">.</span><span class="element-syntax">this_exact_package</span><span class="plain-syntax"> = </span><a href="1-ls.html#SP15" class="function-link"><span class="function-syntax">LargeScale::generic_submodule</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">sid</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP9" class="paragraph-anchor"></a><b>&#167;9. </b>"You must put me in a submodule, identified by <span class="extract"><span class="extract-syntax">sid</span></span>, of the synoptic module."
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">location_requirement</span><span class="plain-syntax"> </span><span class="function-syntax">LocationRequirements::synoptic_submodule</span><span class="plain-syntax">(</span><span class="identifier-syntax">inter_tree</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">submodule_identity</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sid</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">location_requirement</span><span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax"> = </span><a href="1-lr.html#SP1" class="function-link"><span class="function-syntax">LocationRequirements::blank</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax">.</span><span class="element-syntax">this_exact_package</span><span class="plain-syntax"> = </span><a href="1-ls.html#SP15" class="function-link"><span class="function-syntax">LargeScale::synoptic_submodule</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">sid</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP10" class="paragraph-anchor"></a><b>&#167;10. </b>"You must put me in a submodule, identified by <span class="extract"><span class="extract-syntax">sid</span></span>, of the completion module."
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">location_requirement</span><span class="plain-syntax"> </span><span class="function-syntax">LocationRequirements::completion_submodule</span><span class="plain-syntax">(</span><span class="identifier-syntax">inter_tree</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">submodule_identity</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sid</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">location_requirement</span><span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax"> = </span><a href="1-lr.html#SP1" class="function-link"><span class="function-syntax">LocationRequirements::blank</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax">.</span><span class="element-syntax">this_exact_package</span><span class="plain-syntax"> = </span><a href="1-ls.html#SP15" class="function-link"><span class="function-syntax">LargeScale::completion_submodule</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">sid</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP11" class="paragraph-anchor"></a><b>&#167;11. </b>"You must put me somewhere exceptional." This is a hook used by <a href="../inform7/index.html" class="internal">inform7</a>,
and which doesn't work in <a href="../inter/index.html" class="internal">inter</a> alone, for a handful of oddball cases
where a resource needs to be put somewhere strange. See <a href="../runtime-module/2-hrr.html" class="internal">Hierarchy (in runtime)</a>.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">location_requirement</span><span class="plain-syntax"> </span><span class="function-syntax">LocationRequirements::this_exotic_package</span><span class="plain-syntax">(</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">N</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">location_requirement</span><span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax"> = </span><a href="1-lr.html#SP1" class="function-link"><span class="function-syntax">LocationRequirements::blank</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax">.</span><span class="element-syntax">this_exact_package_not_yet_created</span><span class="plain-syntax"> = </span><span class="identifier-syntax">N</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
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