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<!--Weave of 'Package Types' generated by Inweb-->
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<div class="breadcrumbs">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.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>Package Types</b></li></ul></div>
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<p class="purpose">To manage the different types of packages emitted by Inform.</p>
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<ul class="toc"><li><a href="1-pt.html#SP1">§1. Package types</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. Package types. </b>Inter code is a nested hierarchy of "packages", which can be assigned "types".
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Inter requires two types to exist, <span class="extract"><span class="extract-syntax">_plain</span></span> and <span class="extract"><span class="extract-syntax">_code</span></span>, and leaves the rest
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to the user (i.e., us) to define as we see fit. In fact Inform generates
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packages of slightly over 50 different types.
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</p>
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<p class="commentary">At run time, package types are pointers to the inter symbol which defined them,
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but this is not a convenient way to refer to them in the Inform source code.
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Instead we use the following function:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="function-syntax">PackageTypes::get</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">PackageTypes::get</span></span>:<br/><a href="1-pt.html#SP2">§2</a><br/>Building Site - <a href="1-bs.html#SP3">§3</a><br/>Hierarchy Locations - <a href="1-hl.html#SP3">§3</a>, <a href="1-hl.html#SP4">§4</a>, <a href="1-hl.html#SP5">§5</a><br/>Packaging - <a href="1-pck.html#SP11">§11</a>, <a href="1-pck.html#SP14">§14</a>, <a href="1-pck.html#SP17">§17</a>, <a href="1-pck.html#SP19">§19</a><br/>Producing Inter - <a href="3-prd.html#SP3">§3</a></span></button><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="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">name</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_symbols_table</span><span class="plain-syntax"> *</span><span class="identifier-syntax">scope</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterTree::global_scope</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ptype</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterSymbolsTables::symbol_from_name</span><span class="plain-syntax">(</span><span class="identifier-syntax">scope</span><span class="plain-syntax">, </span><span class="identifier-syntax">name</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">ptype</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">enclose</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="1-pt.html#SP1_1" class="named-paragraph-link"><span class="named-paragraph">Decide if this package type is to be enclosing</span><span class="named-paragraph-number">1.1</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">ptype</span><span class="plain-syntax"> = </span><a href="3-prd.html#SP2" class="function-link"><span class="function-syntax">Produce::new_symbol</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">scope</span><span class="plain-syntax">, </span><span class="identifier-syntax">name</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="3-prd.html#SP2" class="function-link"><span class="function-syntax">Produce::guard</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">Inter::PackageType::new_packagetype</span><span class="plain-syntax">(</span>
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<span class="plain-syntax"> </span><a href="1-bs.html#SP2" class="function-link"><span class="function-syntax">Site::package_types</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">), </span><span class="identifier-syntax">ptype</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">enclose</span><span class="plain-syntax">) </span><a href="3-prd.html#SP2" class="function-link"><span class="function-syntax">Produce::annotate_symbol_i</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">ptype</span><span class="plain-syntax">, </span><span class="identifier-syntax">ENCLOSING_IANN</span><span class="plain-syntax">, </span><span class="constant-syntax">1</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ptype</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP1_1" class="paragraph-anchor"></a><b>§1.1. </b>Most package types are "enclosing". Suppose that Inform is compiling
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something to go into the package, but finds that it needs to compile something
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else in order to do so — for example, it's compiling code to set a variable
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to be equal to a literal piece of text, which must itself be compiled as a
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small array. Where does Inform put that array? If the current package is
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"enclosing", then Inform puts it into the package itself; and if not, then
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into the package holding the current package, if that in turn is "enclosing";
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and so on.
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</p>
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<p class="commentary">It seems tidy to make all packages enclosing, and in fact (after much
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experiment) Inform nearly does that. But <span class="extract"><span class="extract-syntax">_code</span></span> packages have to be an
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exception, because the Inter specification doesn't allow constants (and
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therefore arrays) to be defined inside <span class="extract"><span class="extract-syntax">_code</span></span> packages.
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</p>
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<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Decide if this package type is to be enclosing</span><span class="named-paragraph-number">1.1</span></span><span class="comment-syntax"> =</span>
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Str::eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">name</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"_code"</span><span class="plain-syntax">)) </span><span class="identifier-syntax">enclose</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="1-pt.html#SP1">§1</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>Symbol lookups by name are fast, but not instant, so we might some day
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want to optimise this by cacheing the result:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="function-syntax">PackageTypes::function</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">PackageTypes::function</span></span>:<br/>Packaging - <a href="1-pck.html#SP18">§18</a></span></button><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>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="1-pt.html#SP1" class="function-link"><span class="function-syntax">PackageTypes::get</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"_function"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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