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Graham Nelson 9fa1ad6993 Refactored code-provenance Inter instructions
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
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<title>Bookmarks</title>
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<main role="main">
<!--Weave of 'Bookmarks' 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">bytecode</a></li><li><a href="index.html#2">Chapter 2: The Trees</a></li><li><b>Bookmarks</b></li></ul></div>
<p class="purpose">Write positions for inter code being generated.</p>
<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. </b>A bookmark does not record an actual position in an Inter tree &mdash; if we needed
that, a pointer to the relevant <span class="extract"><span class="extract-syntax">inter_tree_node</span></span> would do fine &mdash; but to a
hypothetical position. It describes where to put a node which has not yet been
put into position.
</p>
<p class="commentary">It does this by recording not only a reference node <span class="extract"><span class="extract-syntax">R</span></span> but a relationship
which the hypothetical new position will have with respect to it:
</p>
<pre class="definitions code-font"><span class="definition-keyword">enum</span> <span class="constant-syntax">BEFORE_NODEPLACEMENT</span><span class="plain-syntax"> </span><span class="identifier-syntax">from</span><span class="plain-syntax"> </span><span class="constant-syntax">0</span>
<span class="definition-keyword">enum</span> <span class="constant-syntax">AFTER_NODEPLACEMENT</span>
<span class="definition-keyword">enum</span> <span class="constant-syntax">IMMEDIATELY_AFTER_NODEPLACEMENT</span>
<span class="definition-keyword">enum</span> <span class="constant-syntax">AS_FIRST_CHILD_OF_NODEPLACEMENT</span>
<span class="definition-keyword">enum</span> <span class="constant-syntax">AS_LAST_CHILD_OF_NODEPLACEMENT</span>
</pre>
<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">inter_bookmark</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">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">R</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">placement_wrt_R</span><span class="plain-syntax">; </span><span class="comment-syntax"> one of the </span><span class="extract"><span class="extract-syntax">*_NODEPLACEMENT</span></span><span class="comment-syntax"> values</span>
<span class="plain-syntax">} </span><span class="reserved-syntax">inter_bookmark</span><span class="plain-syntax">;</span>
</pre>
<ul class="endnotetexts"><li>The structure inter_bookmark is accessed in 2/np and here.</li></ul>
<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>&#167;2. </b>Bookmarks are used to mark positions in an Inter tree, though they are often
used in a way which causes them to move forwards through that tree, much as
a bookmark will migrate through a book as it is slowly read.
</p>
<p class="commentary">Because of this, the bookmark structure is one of the few in the Inform tool
chain to be used sometimes as a value and sometimes a reference &mdash; that is,
we make use both of <span class="extract"><span class="extract-syntax">inter_bookmark</span></span> and <span class="extract"><span class="extract-syntax">inter_bookmark *</span></span> as types. So a
function which simply needs to know where to do something will take the
type <span class="extract"><span class="extract-syntax">inter_bookmark</span></span> as an argument &mdash; see <a href="2-np.html#SP1" class="internal">NodePlacement::move_to</a>, for
example &mdash; whereas a function which does something but then nudges the
bookmark onwards will take an <span class="extract"><span class="extract-syntax">inter_bookmark *</span></span>, as in the caee of
<a href="2-np.html#SP3" class="internal">NodePlacement::move_to_moving_bookmark</a>.
</p>
<p class="commentary">Dereferencing a bookmark pointer to a bookmark value is called taking a
"snapshot". The idea is that the original is likely to move on, but we want
to preserve the position it is currently at. For clarity of the code, we
give this a name as a function:
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">inter_bookmark</span><span class="plain-syntax"> </span><span class="function-syntax">InterBookmark::snapshot</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">InterBookmark::snapshot</span></span>:<br/><a href="2-bkm.html#SP3">&#167;3</a><br/>Node Placement - <a href="2-np.html#SP3">&#167;3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_bookmark</span><span class="plain-syntax"> *</span><span class="identifier-syntax">IBM</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">IBM</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>We can also take a snapshot but change the placement:
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">inter_bookmark</span><span class="plain-syntax"> </span><span class="function-syntax">InterBookmark::shifted</span><span class="plain-syntax">(</span><span class="reserved-syntax">inter_bookmark</span><span class="plain-syntax"> *</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">new_placement</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_bookmark</span><span class="plain-syntax"> </span><span class="identifier-syntax">new_IBM</span><span class="plain-syntax"> = </span><a href="2-bkm.html#SP2" class="function-link"><span class="function-syntax">InterBookmark::snapshot</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">new_IBM</span><span class="plain-syntax">.</span><span class="element-syntax">placement_wrt_R</span><span class="plain-syntax"> = </span><span class="identifier-syntax">new_placement</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">new_IBM</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>Of course, we can only snapshot a bookmark already existing somewhere else,
so we still need creator functions:
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">inter_bookmark</span><span class="plain-syntax"> </span><span class="function-syntax">InterBookmark::at_start_of_this_repository</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">InterBookmark::at_start_of_this_repository</span></span>:<br/>Inter in Binary Files - <a href="3-iibf.html#SP10">&#167;10</a><br/>Inter in Text Files - <a href="3-iitf.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="reserved-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="2-bkm.html#SP4" class="function-link"><span class="function-syntax">InterBookmark::after_this_node</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">root_node</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">inter_bookmark</span><span class="plain-syntax"> </span><span class="function-syntax">InterBookmark::after_this_node</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">InterBookmark::after_this_node</span></span>:<br/>Node Placement - <a href="2-np.html#SP3_1">&#167;3.1</a><br/>Transmigration - <a href="2-trn.html#SP3_1">&#167;3.1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">D</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="2-bkm.html#SP4" class="function-link"><span class="function-syntax">InterBookmark::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">D</span><span class="plain-syntax">, </span><span class="constant-syntax">AFTER_NODEPLACEMENT</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">inter_bookmark</span><span class="plain-syntax"> </span><span class="function-syntax">InterBookmark::at_end_of_root</span><button class="popup" onclick="togglePopup('usagePopup4')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup4">Usage of <span class="code-font"><span class="function-syntax">InterBookmark::at_end_of_root</span></span>:<br/>Node Placement - <a href="2-np.html#SP3">&#167;3</a></span></button><span class="plain-syntax">(</span><span class="reserved-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="2-bkm.html#SP4" class="function-link"><span class="function-syntax">InterBookmark::last_child_of</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">root_node</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">inter_bookmark</span><span class="plain-syntax"> </span><span class="function-syntax">InterBookmark::at_end_of_this_package</span><button class="popup" onclick="togglePopup('usagePopup5')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup5">Usage of <span class="code-font"><span class="function-syntax">InterBookmark::at_end_of_this_package</span></span>:<br/>Transmigration - <a href="2-trn.html#SP3_1">&#167;3.1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_package</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pack</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">pack</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"no package supplied"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="2-bkm.html#SP4" class="function-link"><span class="function-syntax">InterBookmark::last_child_of</span></a><span class="plain-syntax">(</span><a href="2-pck.html#SP4" class="function-link"><span class="function-syntax">InterPackage::head</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pack</span><span class="plain-syntax">));</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">inter_bookmark</span><span class="plain-syntax"> </span><span class="function-syntax">InterBookmark::last_child_of</span><button class="popup" onclick="togglePopup('usagePopup6')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup6">Usage of <span class="code-font"><span class="function-syntax">InterBookmark::last_child_of</span></span>:<br/>Node Placement - <a href="2-np.html#SP3_1">&#167;3.1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">D</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="2-bkm.html#SP4" class="function-link"><span class="function-syntax">InterBookmark::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">D</span><span class="plain-syntax">, </span><span class="constant-syntax">AS_LAST_CHILD_OF_NODEPLACEMENT</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">inter_bookmark</span><span class="plain-syntax"> </span><span class="function-syntax">InterBookmark::immediately_after</span><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">D</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="2-bkm.html#SP4" class="function-link"><span class="function-syntax">InterBookmark::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">D</span><span class="plain-syntax">, </span><span class="constant-syntax">IMMEDIATELY_AFTER_NODEPLACEMENT</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">inter_bookmark</span><span class="plain-syntax"> </span><span class="function-syntax">InterBookmark::first_child_of</span><button class="popup" onclick="togglePopup('usagePopup7')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup7">Usage of <span class="code-font"><span class="function-syntax">InterBookmark::first_child_of</span></span>:<br/>Node Placement - <a href="2-np.html#SP3_1">&#167;3.1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">D</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="2-bkm.html#SP4" class="function-link"><span class="function-syntax">InterBookmark::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">D</span><span class="plain-syntax">, </span><span class="constant-syntax">AS_FIRST_CHILD_OF_NODEPLACEMENT</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">inter_bookmark</span><span class="plain-syntax"> </span><span class="function-syntax">InterBookmark::new</span><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">D</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">placement</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">D</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"no node in bookmark"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_bookmark</span><span class="plain-syntax"> </span><span class="identifier-syntax">IBM</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">IBM</span><span class="plain-syntax">.</span><span class="element-syntax">R</span><span class="plain-syntax"> = </span><span class="identifier-syntax">D</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">IBM</span><span class="plain-syntax">.</span><span class="element-syntax">placement_wrt_R</span><span class="plain-syntax"> = </span><span class="identifier-syntax">placement</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">IBM</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>Note that this moves the bookmark, not whatever node in the tree the bookmark
is (or was) marking.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">InterBookmark::move_into_package</span><button class="popup" onclick="togglePopup('usagePopup8')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup8">Usage of <span class="code-font"><span class="function-syntax">InterBookmark::move_into_package</span></span>:<br/>Inter in Text Files - <a href="3-iitf.html#SP3_2">&#167;3.2</a><br/>The Package Construct - <a href="4-tpc.html#SP6">&#167;6</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_bookmark</span><span class="plain-syntax"> *</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">IBM</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"no bookmark supplied"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"invalid package supplied"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">D</span><span class="plain-syntax"> = </span><a href="2-pck.html#SP4" class="function-link"><span class="function-syntax">InterPackage::head</span></a><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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">D</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">D</span><span class="plain-syntax"> = </span><a href="2-pck.html#SP4" class="function-link"><span class="function-syntax">InterPackage::tree</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">)-&gt;</span><span class="element-syntax">root_node</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::last_child</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">D</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">IBM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">R</span><span class="plain-syntax"> = </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::last_child</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">D</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">IBM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">placement_wrt_R</span><span class="plain-syntax"> = </span><span class="constant-syntax">AFTER_NODEPLACEMENT</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">IBM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">R</span><span class="plain-syntax"> = </span><span class="identifier-syntax">D</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">IBM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">placement_wrt_R</span><span class="plain-syntax"> = </span><span class="constant-syntax">AS_FIRST_CHILD_OF_NODEPLACEMENT</span><span class="plain-syntax">;</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>Following the same conventions, this function returns the package into which
a node moved to the bookmark would then live. In particular,
<span class="extract"><span class="extract-syntax">InterBookmark::package(InterBookmark::move_into_package(IBM, P))</span></span> is always
equal to <span class="extract"><span class="extract-syntax">P</span></span>.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">inter_package</span><span class="plain-syntax"> *</span><span class="function-syntax">InterBookmark::package</span><button class="popup" onclick="togglePopup('usagePopup9')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup9">Usage of <span class="code-font"><span class="function-syntax">InterBookmark::package</span></span>:<br/><a href="2-bkm.html#SP7">&#167;7</a><br/>Inter Nodes - <a href="2-in.html#SP5">&#167;5</a><br/>The Warehouse - <a href="2-tw.html#SP7">&#167;7</a><br/>Symbols Tables - <a href="2-st.html#SP17">&#167;17</a><br/>Transmigration - <a href="2-trn.html#SP4_1_1">&#167;4.1.1</a>, <a href="2-trn.html#SP4_2_1_1">&#167;4.2.1.1</a><br/>Inter Constructs - <a href="3-ic.html#SP6">&#167;6</a><br/>Inter in Text Files - <a href="3-iitf.html#SP3_2">&#167;3.2</a><br/>Inter Value Pairs - <a href="3-ivp.html#SP6">&#167;6</a>, <a href="3-ivp.html#SP8">&#167;8</a>, <a href="3-ivp.html#SP9">&#167;9</a>, <a href="3-ivp.html#SP11">&#167;11</a>, <a href="3-ivp.html#SP13">&#167;13</a>, <a href="3-ivp.html#SP15">&#167;15</a><br/>The Comment Construct - <a href="4-tcc.html#SP2">&#167;2</a><br/>The Constant Construct - <a href="4-tcc2.html#SP2">&#167;2</a>, <a href="4-tcc2.html#SP4">&#167;4</a><br/>The Insert Construct - <a href="4-tic.html#SP2">&#167;2</a><br/>The Instance Construct - <a href="4-tic2.html#SP2">&#167;2</a><br/>The Nop Construct - <a href="4-tnc.html#SP2">&#167;2</a><br/>The Origin Construct - <a href="4-toc.html#SP2">&#167;2</a><br/>The Package Construct - <a href="4-tpc.html#SP3">&#167;3</a>, <a href="4-tpc.html#SP4">&#167;4</a><br/>The PackageType Construct - <a href="4-tpc2.html#SP2">&#167;2</a><br/>The Permission Construct - <a href="4-tpc3.html#SP2">&#167;2</a><br/>The Pragma Construct - <a href="4-tpc4.html#SP2">&#167;2</a><br/>The Primitive Construct - <a href="4-tpc5.html#SP2">&#167;2</a><br/>The Property Construct - <a href="4-tpc6.html#SP2">&#167;2</a><br/>The PropertyValue Construct - <a href="4-tpc7.html#SP2">&#167;2</a><br/>The Provenance Construct - <a href="4-tpc8.html#SP2">&#167;2</a><br/>The Typename Construct - <a href="4-ttc.html#SP2">&#167;2</a><br/>The Variable Construct - <a href="4-tvc.html#SP2">&#167;2</a><br/>The Assembly Construct - <a href="5-tac.html#SP2">&#167;2</a><br/>The Cast Construct - <a href="5-tcc.html#SP2">&#167;2</a><br/>The Code Construct - <a href="5-tcc2.html#SP2">&#167;2</a><br/>The Evaluation Construct - <a href="5-tec.html#SP2">&#167;2</a><br/>The Inv Construct - <a href="5-tic.html#SP3">&#167;3</a><br/>The Lab Construct - <a href="5-tlc.html#SP2">&#167;2</a><br/>The Label Construct - <a href="5-tlc2.html#SP2">&#167;2</a><br/>The Local Construct - <a href="5-tlc3.html#SP2">&#167;2</a><br/>The Ref Construct - <a href="5-trc.html#SP2">&#167;2</a><br/>The Reference Construct - <a href="5-trc2.html#SP2">&#167;2</a><br/>The Splat Construct - <a href="5-tsc.html#SP2">&#167;2</a><br/>The Val Construct - <a href="5-tvc.html#SP2">&#167;2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_bookmark</span><span class="plain-syntax"> *</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">IBM</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_package</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pack</span><span class="plain-syntax"> = </span><span class="identifier-syntax">IBM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">R</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">package</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">placement_wrt_R</span><span class="plain-syntax"> == </span><span class="constant-syntax">AS_FIRST_CHILD_OF_NODEPLACEMENT</span><span class="plain-syntax">) ||</span>
<span class="plain-syntax"> (</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">placement_wrt_R</span><span class="plain-syntax"> == </span><span class="constant-syntax">AS_LAST_CHILD_OF_NODEPLACEMENT</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_package</span><span class="plain-syntax"> *</span><span class="identifier-syntax">R_defined</span><span class="plain-syntax"> = </span><a href="4-tpc.html#SP9" class="function-link"><span class="function-syntax">PackageInstruction::at_this_head</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">R</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">R_defined</span><span class="plain-syntax">) </span><span class="identifier-syntax">pack</span><span class="plain-syntax"> = </span><span class="identifier-syntax">R_defined</span><span class="plain-syntax">;</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">pack</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>Some convenience functions:
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">inter_tree</span><span class="plain-syntax"> *</span><span class="function-syntax">InterBookmark::tree</span><button class="popup" onclick="togglePopup('usagePopup10')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup10">Usage of <span class="code-font"><span class="function-syntax">InterBookmark::tree</span></span>:<br/>Inter Nodes - <a href="2-in.html#SP5">&#167;5</a><br/>Node Placement - <a href="2-np.html#SP3">&#167;3</a><br/>Symbols Tables - <a href="2-st.html#SP17">&#167;17</a><br/>Inter in Text Files - <a href="3-iitf.html#SP3_3">&#167;3.3</a>, <a href="3-iitf.html#SP6">&#167;6</a>, <a href="3-iitf.html#SP12">&#167;12</a><br/>Inter Value Pairs - <a href="3-ivp.html#SP6">&#167;6</a>, <a href="3-ivp.html#SP8">&#167;8</a>, <a href="3-ivp.html#SP9">&#167;9</a>, <a href="3-ivp.html#SP11">&#167;11</a>, <a href="3-ivp.html#SP15">&#167;15</a><br/>The Package Construct - <a href="4-tpc.html#SP4">&#167;4</a>, <a href="4-tpc.html#SP6">&#167;6</a><br/>The Provenance Construct - <a href="4-tpc8.html#SP2">&#167;2</a>, <a href="4-tpc8.html#SP5">&#167;5</a><br/>The Inv Construct - <a href="5-tic.html#SP3">&#167;3</a>, <a href="5-tic.html#SP7_1">&#167;7.1</a><br/>The Plug Construct - <a href="6-tpc.html#SP2">&#167;2</a><br/>The Socket Construct - <a href="6-tsc.html#SP2">&#167;2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_bookmark</span><span class="plain-syntax"> *</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">IBM</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</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">IBM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">R</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">tree</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">inter_warehouse</span><span class="plain-syntax"> *</span><span class="function-syntax">InterBookmark::warehouse</span><button class="popup" onclick="togglePopup('usagePopup11')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup11">Usage of <span class="code-font"><span class="function-syntax">InterBookmark::warehouse</span></span>:<br/>The Warehouse - <a href="2-tw.html#SP7">&#167;7</a><br/>The Insert Construct - <a href="4-tic.html#SP2">&#167;2</a><br/>The Instance Construct - <a href="4-tic2.html#SP2">&#167;2</a><br/>The Package Construct - <a href="4-tpc.html#SP4">&#167;4</a><br/>The Property Construct - <a href="4-tpc6.html#SP2">&#167;2</a><br/>The Typename Construct - <a href="4-ttc.html#SP2">&#167;2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_bookmark</span><span class="plain-syntax"> *</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="2-it.html#SP3" class="function-link"><span class="function-syntax">InterTree::warehouse</span></a><span class="plain-syntax">(</span><a href="2-bkm.html#SP7" class="function-link"><span class="function-syntax">InterBookmark::tree</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">));</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">InterBookmark::baseline</span><button class="popup" onclick="togglePopup('usagePopup12')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup12">Usage of <span class="code-font"><span class="function-syntax">InterBookmark::baseline</span></span>:<br/><a href="2-bkm.html#SP8">&#167;8</a><br/>Inter Constructs - <a href="3-ic.html#SP6">&#167;6</a><br/>Inter in Text Files - <a href="3-iitf.html#SP3_2">&#167;3.2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_bookmark</span><span class="plain-syntax"> *</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_package</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pack</span><span class="plain-syntax"> = </span><a href="2-bkm.html#SP6" class="function-link"><span class="function-syntax">InterBookmark::package</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">pack</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="2-pck.html#SP6" class="function-link"><span class="function-syntax">InterPackage::baseline</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pack</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">inter_symbols_table</span><span class="plain-syntax"> *</span><span class="function-syntax">InterBookmark::scope</span><button class="popup" onclick="togglePopup('usagePopup13')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup13">Usage of <span class="code-font"><span class="function-syntax">InterBookmark::scope</span></span>:<br/>Inter in Text Files - <a href="3-iitf.html#SP5">&#167;5</a>, <a href="3-iitf.html#SP12">&#167;12</a>, <a href="3-iitf.html#SP12_14">&#167;12.14</a><br/>The Constant Construct - <a href="4-tcc2.html#SP6_1">&#167;6.1</a><br/>The Instance Construct - <a href="4-tic2.html#SP4_1">&#167;4.1</a>, <a href="4-tic2.html#SP4_2">&#167;4.2</a><br/>The Origin Construct - <a href="4-toc.html#SP4">&#167;4</a><br/>The Package Construct - <a href="4-tpc.html#SP4">&#167;4</a>, <a href="4-tpc.html#SP6">&#167;6</a><br/>The PackageType Construct - <a href="4-tpc2.html#SP3">&#167;3</a><br/>The Permission Construct - <a href="4-tpc3.html#SP4">&#167;4</a><br/>The Primitive Construct - <a href="4-tpc5.html#SP4">&#167;4</a><br/>The Property Construct - <a href="4-tpc6.html#SP4">&#167;4</a><br/>The PropertyValue Construct - <a href="4-tpc7.html#SP4">&#167;4</a><br/>The Typename Construct - <a href="4-ttc.html#SP4">&#167;4</a><br/>The Variable Construct - <a href="4-tvc.html#SP4">&#167;4</a><br/>The Cast Construct - <a href="5-tcc.html#SP4">&#167;4</a><br/>The Lab Construct - <a href="5-tlc.html#SP4">&#167;4</a><br/>The Label Construct - <a href="5-tlc2.html#SP4">&#167;4</a><br/>The Local Construct - <a href="5-tlc3.html#SP4">&#167;4</a><br/>The Ref Construct - <a href="5-trc.html#SP4">&#167;4</a><br/>The Val Construct - <a href="5-tvc.html#SP4">&#167;4</a><br/>The Plug Construct - <a href="6-tpc.html#SP2">&#167;2</a><br/>The Socket Construct - <a href="6-tsc.html#SP2">&#167;2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_bookmark</span><span class="plain-syntax"> *</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_package</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pack</span><span class="plain-syntax"> = </span><a href="2-bkm.html#SP6" class="function-link"><span class="function-syntax">InterBookmark::package</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">pack</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="2-pck.html#SP10" class="function-link"><span class="function-syntax">InterPackage::scope</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pack</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="2-it.html#SP3" class="function-link"><span class="function-syntax">InterTree::global_scope</span></a><span class="plain-syntax">(</span><a href="2-bkm.html#SP7" class="function-link"><span class="function-syntax">InterBookmark::tree</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">IBM</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>Logging:
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">InterBookmark::log</span><button class="popup" onclick="togglePopup('usagePopup14')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup14">Usage of <span class="code-font"><span class="function-syntax">InterBookmark::log</span></span>:<br/>Bytecode Module - <a href="1-bm.html#SP3_6">&#167;3.6</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">virs</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_bookmark</span><span class="plain-syntax"> *</span><span class="identifier-syntax">IBM</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">inter_bookmark</span><span class="plain-syntax"> *) </span><span class="identifier-syntax">virs</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">IBM</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"&lt;null-bookmark&gt;"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"&lt;"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">switch</span><span class="plain-syntax"> (</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">placement_wrt_R</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">BEFORE_NODEPLACEMENT:</span><span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"before:"</span><span class="plain-syntax">); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">AFTER_NODEPLACEMENT:</span><span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"after:"</span><span class="plain-syntax">); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">IMMEDIATELY_AFTER_NODEPLACEMENT:</span><span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"immediately-after:"</span><span class="plain-syntax">); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">AS_FIRST_CHILD_OF_NODEPLACEMENT:</span><span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"first-child:"</span><span class="plain-syntax">); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">AS_LAST_CHILD_OF_NODEPLACEMENT:</span><span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"last-child:"</span><span class="plain-syntax">); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">default:</span><span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"?:"</span><span class="plain-syntax">); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">R</span><span class="plain-syntax">) </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%d"</span><span class="plain-syntax">, </span><span class="identifier-syntax">IBM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">R</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">W</span><span class="plain-syntax">.</span><span class="element-syntax">index</span><span class="plain-syntax">); </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"&lt;NO-NODE&gt;"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"(%d)&gt;"</span><span class="plain-syntax">, </span><a href="2-bkm.html#SP7" class="function-link"><span class="function-syntax">InterBookmark::baseline</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">));</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax">}</span>
</pre>
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