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<!--Weave of 'Action Tries' generated by Inweb-->
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inform7</a></li><li><a href="index.html">runtime</a></li><li><a href="index.html#7">Chapter 7: Still Unsorted</a></li><li><b>Action Tries</b></li></ul></div>
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<p class="purpose">Compiling the try statement, which causes an action to be processed.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b></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">RTActionTries::compile_try</span><span class="plain-syntax">(</span><span class="identifier-syntax">explicit_action</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ea</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">store_instead</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">spec0</span><span class="plain-syntax"> = </span><span class="identifier-syntax">ea</span><span class="plain-syntax">-></span><span class="identifier-syntax">first_noun</span><span class="plain-syntax">; </span><span class="comment-syntax"> the noun</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">spec1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">ea</span><span class="plain-syntax">-></span><span class="identifier-syntax">second_noun</span><span class="plain-syntax">; </span><span class="comment-syntax"> the second noun</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">spec2</span><span class="plain-syntax"> = </span><span class="identifier-syntax">ea</span><span class="plain-syntax">-></span><span class="identifier-syntax">actor</span><span class="plain-syntax">; </span><span class="comment-syntax"> the actor</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">K_understanding</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">Rvalues::is_CONSTANT_of_kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">spec0</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_understanding</span><span class="plain-syntax">)) &&</span>
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<span class="plain-syntax"> (</span><span class="function-syntax"><subject-pronoun></span><span class="plain-syntax">(</span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">spec0</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><span class="identifier-syntax">spec0</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Rvalues::from_wording</span><span class="plain-syntax">(</span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">spec0</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">K_understanding</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">Rvalues::is_CONSTANT_of_kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">spec1</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_understanding</span><span class="plain-syntax">)) &&</span>
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<span class="plain-syntax"> (</span><span class="function-syntax"><subject-pronoun></span><span class="plain-syntax">(</span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">spec1</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><span class="identifier-syntax">spec1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Rvalues::from_wording</span><span class="plain-syntax">(</span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">spec1</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">action_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">an</span><span class="plain-syntax"> = </span><span class="identifier-syntax">ea</span><span class="plain-syntax">-></span><span class="identifier-syntax">action</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">flag_bits</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="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Kinds::eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">Specifications::to_kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">spec0</span><span class="plain-syntax">), </span><span class="identifier-syntax">K_text</span><span class="plain-syntax">)) </span><span class="identifier-syntax">flag_bits</span><span class="plain-syntax"> += </span><span class="constant-syntax">16</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">Kinds::eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">Specifications::to_kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">spec1</span><span class="plain-syntax">), </span><span class="identifier-syntax">K_text</span><span class="plain-syntax">)) </span><span class="identifier-syntax">flag_bits</span><span class="plain-syntax"> += </span><span class="constant-syntax">32</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">flag_bits</span><span class="plain-syntax"> > </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><a href="2-th.html#SP1" class="function-link"><span class="function-syntax">TheHeap::ensure_basic_heap_present</span></a><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">ea</span><span class="plain-syntax">-></span><span class="identifier-syntax">request</span><span class="plain-syntax">) </span><span class="identifier-syntax">flag_bits</span><span class="plain-syntax"> += </span><span class="constant-syntax">1</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><a href="2-ec.html#SP13" class="function-link"><span class="function-syntax">EmitCode::call</span></a><span class="plain-syntax">(</span><a href="2-hrr.html#SP11" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">TRYACTION_HL</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::down</span></a><span class="plain-syntax">();</span>
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<span class="plain-syntax"> </span><a href="2-ec.html#SP7" class="function-link"><span class="function-syntax">EmitCode::val_number</span></a><span class="plain-syntax">((</span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax">) </span><span class="identifier-syntax">flag_bits</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">spec2</span><span class="plain-syntax">) </span><a href="7-at.html#SP2" class="function-link"><span class="function-syntax">RTActionTries::compile_parameter</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">spec2</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_object</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><a href="2-ec.html#SP7" class="function-link"><span class="function-syntax">EmitCode::val_iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_object</span><span class="plain-syntax">, </span><a href="2-hrr.html#SP11" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">PLAYER_HL</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><a href="2-ec.html#SP7" class="function-link"><span class="function-syntax">EmitCode::val_iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_action_name</span><span class="plain-syntax">, </span><a href="5-act2.html#SP6" class="function-link"><span class="function-syntax">RTActions::double_sharp</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">an</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">spec0</span><span class="plain-syntax">) </span><a href="7-at.html#SP2" class="function-link"><span class="function-syntax">RTActionTries::compile_parameter</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">spec0</span><span class="plain-syntax">, </span><span class="identifier-syntax">ActionSemantics::kind_of_noun</span><span class="plain-syntax">(</span><span class="identifier-syntax">an</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><a href="2-ec.html#SP7" class="function-link"><span class="function-syntax">EmitCode::val_number</span></a><span class="plain-syntax">(0);</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">spec1</span><span class="plain-syntax">) </span><a href="7-at.html#SP2" class="function-link"><span class="function-syntax">RTActionTries::compile_parameter</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">spec1</span><span class="plain-syntax">, </span><span class="identifier-syntax">ActionSemantics::kind_of_second</span><span class="plain-syntax">(</span><span class="identifier-syntax">an</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><a href="2-ec.html#SP7" class="function-link"><span class="function-syntax">EmitCode::val_number</span></a><span class="plain-syntax">(0);</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">store_instead</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><a href="2-ec.html#SP13" class="function-link"><span class="function-syntax">EmitCode::call</span></a><span class="plain-syntax">(</span><a href="2-hrr.html#SP11" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">STORED_ACTION_TY_CURRENT_HL</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::down</span></a><span class="plain-syntax">();</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Frames::emit_new_local_value</span><span class="plain-syntax">(</span><span class="identifier-syntax">K_stored_action</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::up</span></a><span class="plain-syntax">();</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::up</span></a><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="SP2" class="paragraph-anchor"></a><b>§2. </b>Which requires the following. Note that if the action expects to see a
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<span class="extract"><span class="extract-syntax">K_understanding</span></span>, then we typecheck in a way which will not cause an unwanted
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silent cast to <span class="extract"><span class="extract-syntax">K_text</span></span>; but type-safety is not violated.
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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">RTActionTries::compile_parameter</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">RTActionTries::compile_parameter</span></span>:<br/><a href="7-at.html#SP1">§1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">term</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">required_kind</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">K_understanding</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">Kinds::eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">required_kind</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_understanding</span><span class="plain-syntax">))) {</span>
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<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="identifier-syntax">Specifications::to_kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">term</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">Kinds::compatible</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_understanding</span><span class="plain-syntax">)) ||</span>
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<span class="plain-syntax"> (</span><span class="identifier-syntax">Kinds::compatible</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_text</span><span class="plain-syntax">)))</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">required_kind</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>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Dash::check_value</span><span class="plain-syntax">(</span><span class="identifier-syntax">term</span><span class="plain-syntax">, </span><span class="identifier-syntax">required_kind</span><span class="plain-syntax">))</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">CompileValues::to_code_val_of_kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">term</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_object</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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