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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../inform7n.html">Inform7</a></li><li><a href="index.html">assertions</a></li><li><a href="index.html#6">Chapter 6: Rules, Rulebooks and Activities</a></li><li><b>Shared Variables</b></li></ul></div>
<p class="purpose">Shared variables are held in common by all rules working in some goal.</p>
<ul class="toc"><li><a href="6-sv.html#SP1">&#167;1. Introduction</a></li><li><a href="6-sv.html#SP2">&#167;2. Variables</a></li><li><a href="6-sv.html#SP6">&#167;6. Sets</a></li><li><a href="6-sv.html#SP8">&#167;8. Access lists</a></li></ul><hr class="tocbar">
<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. Introduction. </b>Inform allows some variables to be shared by a number of different rules
(with different stack frames) and yet not be global in scope or permanent
in existence: they are shared by some process carried out by rulebooks.
</p>
<p class="commentary">The semantics of shared variables are unusual because rules can be
in multiple rulebooks, or can be moved out of their expected rulebooks.
Their names are therefore not limited in scope &mdash; they are global, and
they belong to the same namespace as global variables. But access to them
is restricted to just those rules with permission.
</p>
<p class="commentary">Each <a href="6-sv.html#SP2" class="internal">shared_variable</a> belongs to just one <a href="6-sv.html#SP6" class="internal">shared_variable_set</a>, but the
code forming the body of a rule may be able to access multiple sets. So
each stack frame has its own <a href="6-sv.html#SP8" class="internal">shared_variable_access_list</a> of those sets
which it can see.
</p>
<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>&#167;2. Variables. </b>As can be seen, a shared variable is really just some additional expectations
placed on a nonlocal variable (for which, see <a href="../knowledge-module/2-nv.html" class="internal">Nonlocal Variables (in knowledge)</a>):
</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">shared_variable</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">shared_variable_set</span><span class="plain-syntax"> *</span><span class="identifier-syntax">owner</span><span class="plain-syntax">; </span><span class="comment-syntax"> who owns this</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">index_in_owner</span><span class="plain-syntax">; </span><span class="comment-syntax"> counting upwards from 0</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">name</span><span class="plain-syntax">; </span><span class="comment-syntax"> text of the name</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">assigned_at</span><span class="plain-syntax">; </span><span class="comment-syntax"> sentence creating the variable</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">underlying_var</span><span class="plain-syntax">; </span><span class="comment-syntax"> the variable in question</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">match_wording_text</span><span class="plain-syntax">; </span><span class="comment-syntax"> matching text (relevant for action variables only)</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">is_actor</span><span class="plain-syntax">; </span><span class="comment-syntax"> set only for the special "actor" variable</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">CLASS_DEFINITION</span>
<span class="plain-syntax">} </span><span class="reserved-syntax">shared_variable</span><span class="plain-syntax">;</span>
</pre>
<ul class="endnotetexts"><li>The structure shared_variable is accessed in 3/nuor, 3/dbtr, 3/rpr, 4/ass, 5/tpf, 5/po, 6/rls, 6/fao, 6/act, 7/tc, 7/tbl, 7/eqt and here.</li></ul>
<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>&#167;3. </b>And it can only be created within a set:
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">shared_variable</span><span class="plain-syntax"> *</span><span class="function-syntax">SharedVariables::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">SharedVariables::new</span></span>:<br/>Rulebooks - <a href="6-rlb.html#SP11">&#167;11</a><br/>Activities - <a href="6-act.html#SP9">&#167;9</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">shared_variable_set</span><span class="plain-syntax"> *</span><span class="identifier-syntax">set</span><span class="plain-syntax">, </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K</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">is_actor</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">shared_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">shv</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">shared_variable</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Articles::remove_the</span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">shv</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">name</span><span class="plain-syntax"> = </span><span class="identifier-syntax">W</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">shv</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">owner</span><span class="plain-syntax"> = </span><span class="identifier-syntax">set</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">shv</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">index_in_owner</span><span class="plain-syntax"> = </span><span class="identifier-syntax">LinkedLists::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">set</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">variables</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">shv</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">assigned_at</span><span class="plain-syntax"> = </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">shv</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">match_wording_text</span><span class="plain-syntax"> = </span><span class="identifier-syntax">EMPTY_WORDING</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NonlocalVariables::new</span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">K</span><span class="plain-syntax">, </span><span class="identifier-syntax">shv</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">shv</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">underlying_var</span><span class="plain-syntax"> = </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">shv</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">is_actor</span><span class="plain-syntax"> = </span><span class="identifier-syntax">is_actor</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">RTVariables::tie_NLV_to_shared_variable</span><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">, </span><span class="identifier-syntax">shv</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="6-sv.html#SP6" class="function-link"><span class="function-syntax">SharedVariables::add_to_set</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">shv</span><span class="plain-syntax">, </span><span class="identifier-syntax">set</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">shv</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>Some miscellaneous access functions:
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="function-syntax">SharedVariables::get_owner_iname</span><span class="plain-syntax">(</span><span class="reserved-syntax">shared_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">shv</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">shv</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">owner</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">recognition_iname</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">SharedVariables::get_index</span><span class="plain-syntax">(</span><span class="reserved-syntax">shared_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">shv</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">shv</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">index_in_owner</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="function-syntax">SharedVariables::get_kind</span><span class="plain-syntax">(</span><span class="reserved-syntax">shared_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">shv</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax"> = </span><a href="6-sv.html#SP4" class="function-link"><span class="function-syntax">SharedVariables::get_variable</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">shv</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">NonlocalVariables::kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="identifier-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="function-syntax">SharedVariables::get_variable</span><span class="plain-syntax">(</span><span class="reserved-syntax">shared_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">shv</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">shv</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">shv</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">underlying_var</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">SharedVariables::is_actor</span><span class="plain-syntax">(</span><span class="reserved-syntax">shared_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">shv</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">shv</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">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">shv</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">is_actor</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>The match text associated with a shared variable is used in parsing action
patterns: see <a href="../if-module/4-anl.html" class="internal">Action Name Lists (in if)</a>. But for most shared variables, this
text remains empty.
</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">SharedVariables::set_matching_text</span><span class="plain-syntax">(</span><span class="reserved-syntax">shared_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">shv</span><span class="plain-syntax">, </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">shv</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">match_wording_text</span><span class="plain-syntax"> = </span><span class="identifier-syntax">W</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="function-syntax">SharedVariables::get_matching_text</span><span class="plain-syntax">(</span><span class="reserved-syntax">shared_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">shv</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">shv</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">match_wording_text</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. Sets. </b>Sets are identified by an identifier which will be defined during linking so
that it is unique among all variable sets in the executable.
</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">shared_variable_set</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">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">recognition_iname</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">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">variables</span><span class="plain-syntax">; </span><span class="comment-syntax"> of </span><span class="extract"><span class="extract-syntax">shared_variable</span></span>
<span class="plain-syntax"> </span><span class="identifier-syntax">CLASS_DEFINITION</span>
<span class="plain-syntax">} </span><span class="reserved-syntax">shared_variable_set</span><span class="plain-syntax">;</span>
<span class="reserved-syntax">shared_variable_set</span><span class="plain-syntax"> *</span><span class="function-syntax">SharedVariables::new_set</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">SharedVariables::new_set</span></span>:<br/>Rulebooks - <a href="6-rlb.html#SP2">&#167;2</a><br/>Activities - <a href="6-act.html#SP4">&#167;4</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">iname</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">shared_variable_set</span><span class="plain-syntax"> *</span><span class="identifier-syntax">set</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">shared_variable_set</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">set</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">recognition_iname</span><span class="plain-syntax"> = </span><span class="identifier-syntax">iname</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">set</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">variables</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="reserved-syntax">shared_variable</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">set</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">SharedVariables::set_empty</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">SharedVariables::set_empty</span></span>:<br/>Rulebooks - <a href="6-rlb.html#SP11">&#167;11</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">shared_variable_set</span><span class="plain-syntax"> *</span><span class="identifier-syntax">set</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">set</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>
<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">set</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">variables</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>
<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>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">size_of_largest_set</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">SharedVariables::add_to_set</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">SharedVariables::add_to_set</span></span>:<br/><a href="6-sv.html#SP3">&#167;3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">shared_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">shv</span><span class="plain-syntax">, </span><span class="reserved-syntax">shared_variable_set</span><span class="plain-syntax"> *</span><span class="identifier-syntax">set</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">ADD_TO_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">shv</span><span class="plain-syntax">, </span><span class="reserved-syntax">shared_variable</span><span class="plain-syntax">, </span><span class="identifier-syntax">set</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">variables</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">LinkedLists::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">set</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">variables</span><span class="plain-syntax">) &gt; </span><span class="identifier-syntax">size_of_largest_set</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">size_of_largest_set</span><span class="plain-syntax"> = </span><span class="identifier-syntax">LinkedLists::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">set</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">variables</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">SharedVariables::size_of_largest_set</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">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">size_of_largest_set</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<ul class="endnotetexts"><li>The structure shared_variable_set is private to this section.</li></ul>
<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>&#167;7. </b>Returns the first variable in the set whose matching text begins <span class="extract"><span class="extract-syntax">W</span></span>. Note
that this requires the match text to be nonempty, so it can only return
variables which have one.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">shared_variable</span><span class="plain-syntax"> *</span><span class="function-syntax">SharedVariables::parse_match_clause</span><span class="plain-syntax">(</span><span class="reserved-syntax">shared_variable_set</span><span class="plain-syntax"> *</span><span class="identifier-syntax">set</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">shared_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">shv</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">shv</span><span class="plain-syntax">, </span><span class="reserved-syntax">shared_variable</span><span class="plain-syntax">, </span><span class="identifier-syntax">set</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">variables</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">Wordings::starts_with</span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">shv</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">match_wording_text</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">shv</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">NULL</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. Access lists. </b>These could hardly be simpler:
</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">shared_variable_access_list</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">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sets</span><span class="plain-syntax">; </span><span class="comment-syntax"> of </span><span class="extract"><span class="extract-syntax">shared_variable_set</span></span>
<span class="plain-syntax"> </span><span class="identifier-syntax">CLASS_DEFINITION</span>
<span class="plain-syntax">} </span><span class="reserved-syntax">shared_variable_access_list</span><span class="plain-syntax">;</span>
<span class="reserved-syntax">shared_variable_access_list</span><span class="plain-syntax"> *</span><span class="function-syntax">SharedVariables::new_access_list</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">SharedVariables::new_access_list</span></span>:<br/>Rules - <a href="6-rls.html#SP2">&#167;2</a>, <a href="6-rls.html#SP10">&#167;10</a><br/>Rulebooks - <a href="6-rlb.html#SP2">&#167;2</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">shared_variable_access_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nshvol</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">shared_variable_access_list</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">nshvol</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">sets</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="reserved-syntax">shared_variable_set</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">nshvol</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<ul class="endnotetexts"><li>The structure shared_variable_access_list is private to this section.</li></ul>
<p class="commentary firstcommentary"><a id="SP9" class="paragraph-anchor"></a><b>&#167;9. </b>Duplicates are not allowed:
</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">SharedVariables::add_set_to_access_list</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">SharedVariables::add_set_to_access_list</span></span>:<br/><a href="6-sv.html#SP10">&#167;10</a><br/>Rules - <a href="6-rls.html#SP10">&#167;10</a><br/>Rulebooks - <a href="6-rlb.html#SP2">&#167;2</a>, <a href="6-rlb.html#SP12">&#167;12</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">shared_variable_access_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">access</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">shared_variable_set</span><span class="plain-syntax"> *</span><span class="identifier-syntax">set</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">access</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">shared_variable_set</span><span class="plain-syntax"> *</span><span class="identifier-syntax">existing</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">existing</span><span class="plain-syntax">, </span><span class="reserved-syntax">shared_variable_set</span><span class="plain-syntax">, </span><span class="identifier-syntax">access</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">sets</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">existing</span><span class="plain-syntax"> == </span><span class="identifier-syntax">set</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">ADD_TO_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">set</span><span class="plain-syntax">, </span><span class="reserved-syntax">shared_variable_set</span><span class="plain-syntax">, </span><span class="identifier-syntax">access</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">sets</span><span class="plain-syntax">);</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>This changes <span class="extract"><span class="extract-syntax">access</span></span> to the union of <span class="extract"><span class="extract-syntax">access</span></span> and <span class="extract"><span class="extract-syntax">extras</span></span>:
</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">SharedVariables::append_access_list</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">SharedVariables::append_access_list</span></span>:<br/>Rules - <a href="6-rls.html#SP10">&#167;10</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">shared_variable_access_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">access</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">shared_variable_access_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">extras</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">shared_variable_set</span><span class="plain-syntax"> *</span><span class="identifier-syntax">set</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">extras</span><span class="plain-syntax">) &amp;&amp; (</span><span class="identifier-syntax">access</span><span class="plain-syntax">))</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">set</span><span class="plain-syntax">, </span><span class="reserved-syntax">shared_variable_set</span><span class="plain-syntax">, </span><span class="identifier-syntax">extras</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">sets</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><a href="6-sv.html#SP9" class="function-link"><span class="function-syntax">SharedVariables::add_set_to_access_list</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">access</span><span class="plain-syntax">, </span><span class="identifier-syntax">set</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>Returns the first shared variable of the given name <span class="extract"><span class="extract-syntax">W</span></span> in any set in the
access list. This would be inefficient if access lists were ever large, or
if individual sets were, but they are not. Giving each access list its own
associative hash would make little or no saving of time, and would decrease
the predictability of results.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">shared_variable</span><span class="plain-syntax"> *</span><span class="function-syntax">SharedVariables::parse_from_access_list</span><span class="plain-syntax">(</span><span class="reserved-syntax">shared_variable_access_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">access</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</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">Wordings::empty</span><span class="plain-syntax">(</span><span class="identifier-syntax">W</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="identifier-syntax">W</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Articles::remove_the</span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">shared_variable_set</span><span class="plain-syntax"> *</span><span class="identifier-syntax">set</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">access</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">set</span><span class="plain-syntax">, </span><span class="reserved-syntax">shared_variable_set</span><span class="plain-syntax">, </span><span class="identifier-syntax">access</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">sets</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">shared_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">shv</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">shv</span><span class="plain-syntax">, </span><span class="reserved-syntax">shared_variable</span><span class="plain-syntax">, </span><span class="identifier-syntax">set</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">variables</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">Wordings::match</span><span class="plain-syntax">(</span><span class="identifier-syntax">shv</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">name</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</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">shv</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">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP12" class="paragraph-anchor"></a><b>&#167;12. </b>Logging lists of lists:
</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">SharedVariables::log_access_list</span><span class="plain-syntax">(</span><span class="reserved-syntax">shared_variable_access_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">list</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">list</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">"Shared access list %d = { "</span><span class="plain-syntax">, </span><span class="identifier-syntax">list</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">allocation_id</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">n</span><span class="plain-syntax"> = </span><span class="constant-syntax">1</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">shared_variable_set</span><span class="plain-syntax"> *</span><span class="identifier-syntax">set</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">set</span><span class="plain-syntax">, </span><span class="reserved-syntax">shared_variable_set</span><span class="plain-syntax">, </span><span class="identifier-syntax">list</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">sets</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">n</span><span class="plain-syntax">++ &gt; </span><span class="constant-syntax">1</span><span class="plain-syntax">) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">", "</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="6-sv.html#SP12" class="function-link"><span class="function-syntax">SharedVariables::log_set</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">set</span><span class="plain-syntax">);</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">" }\n"</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">"No access list\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">SharedVariables::log_set</span><span class="plain-syntax">(</span><span class="reserved-syntax">shared_variable_set</span><span class="plain-syntax"> *</span><span class="identifier-syntax">set</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">set</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">"{ "</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">n</span><span class="plain-syntax"> = </span><span class="constant-syntax">1</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">shared_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">shv</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">shv</span><span class="plain-syntax">, </span><span class="reserved-syntax">shared_variable</span><span class="plain-syntax">, </span><span class="identifier-syntax">set</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">variables</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">n</span><span class="plain-syntax">++ &gt; </span><span class="constant-syntax">1</span><span class="plain-syntax">) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">", "</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">"%W"</span><span class="plain-syntax">, </span><span class="identifier-syntax">shv</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">name</span><span class="plain-syntax">);</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">" }"</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">"null"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax">}</span>
</pre>
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