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<!--Weave of 'Inter Node Lists' generated by Inweb-->
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<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>Inter Node Lists</b></li></ul></div>
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<p class="purpose">Utility functions to store lists of nodes, either as linked lists or flexibly-sized arrays.</p>
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<ul class="toc"><li><a href="2-inl.html#SP1">§1. Unsortable lists</a></li><li><a href="2-inl.html#SP3">§3. Sortable lists</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. Unsortable lists. </b>Well, these are short and sweet. An <a href="2-inl.html#SP1" class="internal">inter_node_list</a> is just an efficiently
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stored linked list of //inter_tree_node//s.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<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_node_list</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">the_nodes</span><span class="plain-syntax">; </span><span class="comment-syntax"> of </span><span class="extract"><span class="extract-syntax">inter_tree_node</span></span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">CLASS_DEFINITION</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">inter_node_list</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">inter_node_list</span><span class="plain-syntax"> *</span><span class="function-syntax">InterNodeList::new</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">InterNodeList::new</span></span>:<br/>The Warehouse - <a href="2-tw.html#SP10">§10</a><br/>Inter in Binary Files - <a href="3-iibf.html#SP9_1_3_2_4">§9.1.3.2.4</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">inter_node_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ifl</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">inter_node_list</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">ifl</span><span class="plain-syntax">-></span><span class="element-syntax">the_nodes</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">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ifl</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">InterNodeList::add</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">InterNodeList::add</span></span>:<br/>The Permission Construct - <a href="4-tpc3.html#SP3">§3</a><br/>The PropertyValue Construct - <a href="4-tpc7.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_node_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">FL</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</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">F</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">"linked invalid node"</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">FL</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">"bad node list"</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">FL</span><span class="plain-syntax">-></span><span class="element-syntax">the_nodes</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">FL</span><span class="plain-syntax">-></span><span class="element-syntax">the_nodes</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">ADD_TO_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">F</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax">, </span><span class="identifier-syntax">FL</span><span class="plain-syntax">-></span><span class="element-syntax">the_nodes</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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<ul class="endnotetexts"><li>The structure inter_node_list is private to this section.</li></ul>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>We can do two things with these: test them for emptiness, and loop through
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them. And that's it.
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</p>
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<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="identifier-syntax">LOOP_THROUGH_INTER_NODE_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">F</span><span class="plain-syntax">, </span><span class="identifier-syntax">ifl</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">ifl</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">ifl</span><span class="plain-syntax">-></span><span class="element-syntax">the_nodes</span><span class="plain-syntax">))</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">F</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax">, </span><span class="identifier-syntax">ifl</span><span class="plain-syntax">-></span><span class="element-syntax">the_nodes</span><span class="plain-syntax">)</span>
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</pre>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">InterNodeList::empty</span><span class="plain-syntax">(</span><span class="reserved-syntax">inter_node_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">FL</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">FL</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">TRUE</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">LinkedLists::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">FL</span><span class="plain-syntax">-></span><span class="element-syntax">the_nodes</span><span class="plain-syntax">) == </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</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="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</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="SP3" class="paragraph-anchor"></a><b>§3. Sortable lists. </b>Unlike an <a href="2-inl.html#SP1" class="internal">inter_node_list</a>, an <a href="2-inl.html#SP3" class="internal">inter_node_array</a> has entries which are
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accessible in O(1) time, and can easily be sorted; but it takes more memory.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<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_node_array</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">list_extent</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">list_used</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">ina_entry</span><span class="plain-syntax"> *</span><span class="identifier-syntax">list</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">CLASS_DEFINITION</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">inter_node_array</span><span class="plain-syntax">;</span>
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<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">ina_entry</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">sort_key</span><span class="plain-syntax">;</span>
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<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">node</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">ina_entry</span><span class="plain-syntax">;</span>
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</pre>
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<ul class="endnotetexts"><li>The structure inter_node_array is private to this section.</li><li>The structure ina_entry is private to this section.</li></ul>
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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. </b></p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">inter_node_array</span><span class="plain-syntax"> *</span><span class="function-syntax">InterNodeList::new_array</span><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">inter_node_array</span><span class="plain-syntax"> *</span><span class="identifier-syntax">NL</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">inter_node_array</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">NL</span><span class="plain-syntax">-></span><span class="element-syntax">list_extent</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">NL</span><span class="plain-syntax">-></span><span class="element-syntax">list_used</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">NL</span><span class="plain-syntax">-></span><span class="element-syntax">list</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">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NL</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">InterNodeList::array_len</span><span class="plain-syntax">(</span><span class="reserved-syntax">inter_node_array</span><span class="plain-syntax"> *</span><span class="identifier-syntax">NL</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">NL</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">"null inter_node_array"</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><span class="identifier-syntax">NL</span><span class="plain-syntax">-></span><span class="element-syntax">list_used</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="SP5" class="paragraph-anchor"></a><b>§5. </b>These are expected to be fairly large, so the capacity starts out at 128 and
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quadruples each time this is exhausted:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">InterNodeList::array_add</span><span class="plain-syntax">(</span><span class="reserved-syntax">inter_node_array</span><span class="plain-syntax"> *</span><span class="identifier-syntax">NL</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</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">NL</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">"null inter_node_array"</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">NL</span><span class="plain-syntax">-></span><span class="element-syntax">list_extent</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">NL</span><span class="plain-syntax">-></span><span class="element-syntax">list_extent</span><span class="plain-syntax"> = </span><span class="constant-syntax">256</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">NL</span><span class="plain-syntax">-></span><span class="element-syntax">list</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">ina_entry</span><span class="plain-syntax"> *)</span>
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<span class="plain-syntax"> (</span><span class="identifier-syntax">Memory::calloc</span><span class="plain-syntax">(</span><span class="identifier-syntax">NL</span><span class="plain-syntax">-></span><span class="element-syntax">list_extent</span><span class="plain-syntax">, </span><span class="reserved-syntax">sizeof</span><span class="plain-syntax">(</span><span class="reserved-syntax">ina_entry</span><span class="plain-syntax">), </span><span class="constant-syntax">TREE_LIST_MREASON</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">NL</span><span class="plain-syntax">-></span><span class="element-syntax">list_used</span><span class="plain-syntax"> >= </span><span class="identifier-syntax">NL</span><span class="plain-syntax">-></span><span class="element-syntax">list_extent</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">old_extent</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NL</span><span class="plain-syntax">-></span><span class="element-syntax">list_extent</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">NL</span><span class="plain-syntax">-></span><span class="element-syntax">list_extent</span><span class="plain-syntax"> *= </span><span class="constant-syntax">4</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">ina_entry</span><span class="plain-syntax"> *</span><span class="identifier-syntax">new_list</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">ina_entry</span><span class="plain-syntax"> *)</span>
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<span class="plain-syntax"> (</span><span class="identifier-syntax">Memory::calloc</span><span class="plain-syntax">(</span><span class="identifier-syntax">NL</span><span class="plain-syntax">-></span><span class="element-syntax">list_extent</span><span class="plain-syntax">, </span><span class="reserved-syntax">sizeof</span><span class="plain-syntax">(</span><span class="reserved-syntax">ina_entry</span><span class="plain-syntax">), </span><span class="constant-syntax">TREE_LIST_MREASON</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">i</span><span class="function-syntax"><NL-></span><span class="element-syntax">list_used</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">new_list</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">] = </span><span class="identifier-syntax">NL</span><span class="plain-syntax">-></span><span class="element-syntax">list</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">Memory::I7_free</span><span class="plain-syntax">(</span><span class="identifier-syntax">NL</span><span class="plain-syntax">-></span><span class="element-syntax">list</span><span class="plain-syntax">, </span><span class="constant-syntax">TREE_LIST_MREASON</span><span class="plain-syntax">, </span><span class="identifier-syntax">old_extent</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">NL</span><span class="plain-syntax">-></span><span class="element-syntax">list</span><span class="plain-syntax"> = </span><span class="identifier-syntax">new_list</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="identifier-syntax">NL</span><span class="plain-syntax">-></span><span class="element-syntax">list</span><span class="plain-syntax">[</span><span class="identifier-syntax">NL</span><span class="plain-syntax">-></span><span class="element-syntax">list_used</span><span class="plain-syntax">].</span><span class="element-syntax">sort_key</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NL</span><span class="plain-syntax">-></span><span class="element-syntax">list_used</span><span class="plain-syntax">;</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">NL</span><span class="plain-syntax">-></span><span class="element-syntax">list</span><span class="plain-syntax">[</span><span class="identifier-syntax">NL</span><span class="plain-syntax">-></span><span class="element-syntax">list_used</span><span class="plain-syntax">++].</span><span class="element-syntax">node</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">;</span>
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|
<span class="plain-syntax">}</span>
|
|
</pre>
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|
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>§6. </b>Note that this defers to the sorting method supplied in <span class="extract"><span class="extract-syntax">cmp</span></span>; that might
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choose to use the <span class="extract"><span class="extract-syntax">sort_key</span></span> value, or might not. <span class="extract"><span class="extract-syntax">sort_key</span></span> is initialised to
|
|
be the original position in the array, because that can then be used as a last
|
|
resort to ensure that the sorting algorithm is stable; most implementations
|
|
of <span class="extract"><span class="extract-syntax">qsort</span></span> in the C standard library are variations on quicksort and are unstable.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">InterNodeList::array_sort</span><span class="plain-syntax">(</span><span class="reserved-syntax">inter_node_array</span><span class="plain-syntax"> *</span><span class="identifier-syntax">NL</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">cmp</span><span class="plain-syntax">)(</span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *, </span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</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">NL</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">"null inter_node_array"</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">NL</span><span class="plain-syntax">-></span><span class="element-syntax">list_used</span><span class="plain-syntax"> > </span><span class="constant-syntax">0</span><span class="plain-syntax">)</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">qsort</span><span class="plain-syntax">(</span><span class="identifier-syntax">NL</span><span class="plain-syntax">-></span><span class="element-syntax">list</span><span class="plain-syntax">, (</span><span class="identifier-syntax">size_t</span><span class="plain-syntax">) </span><span class="identifier-syntax">NL</span><span class="plain-syntax">-></span><span class="element-syntax">list_used</span><span class="plain-syntax">, </span><span class="reserved-syntax">sizeof</span><span class="plain-syntax">(</span><span class="reserved-syntax">ina_entry</span><span class="plain-syntax">), </span><span class="identifier-syntax">cmp</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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