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<!--Weave of 'Control Structures' generated by Inweb-->
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../inbuildn.html">Inbuild Modules</a></li><li><a href="index.html">supervisor</a></li><li><a href="index.html#6">Chapter 6: Inform Source Text</a></li><li><b>Control Structures</b></li></ul></div>
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<p class="purpose">To specify the syntax of control structures such as repeat, if and otherwise.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>Certain phrases are "control structures": otherwise, if, repeat, while and
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so on. These have different expectations in terms of the layout of surrounding
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phrases in rule or phrase definitions, and the following structure defines
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the relevant behaviour. (The contents are static.)
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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">control_structure_phrase</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">control_structure_phrase</span><span class="plain-syntax"> *</span><span class="identifier-syntax">subordinate_to</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">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">mnemonic</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">indent_subblocks</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">body_empty_except_for_subordinates</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">used_at_stage</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">is_a_loop</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">requires_new_syntax</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">allow_run_on</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">keyword</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">control_structure_phrase</span><span class="plain-syntax">;</span>
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</pre>
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<ul class="endnotetexts"><li>The structure control_structure_phrase 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></p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">control_structure_phrase</span><span class="plain-syntax"> *</span><span class="function-syntax">ControlStructures::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">ControlStructures::new</span></span>:<br/><a href="6-cs.html#SP5">§5</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">mnemonic</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">control_structure_phrase</span><span class="plain-syntax"> *</span><span class="identifier-syntax">csp</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">control_structure_phrase</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">csp</span><span class="plain-syntax">-></span><span class="element-syntax">mnemonic</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::duplicate</span><span class="plain-syntax">(</span><span class="identifier-syntax">mnemonic</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">csp</span><span class="plain-syntax">-></span><span class="element-syntax">subordinate_to</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="identifier-syntax">csp</span><span class="plain-syntax">-></span><span class="element-syntax">indent_subblocks</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">csp</span><span class="plain-syntax">-></span><span class="element-syntax">body_empty_except_for_subordinates</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">csp</span><span class="plain-syntax">-></span><span class="element-syntax">used_at_stage</span><span class="plain-syntax"> = -1;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">csp</span><span class="plain-syntax">-></span><span class="element-syntax">requires_new_syntax</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">csp</span><span class="plain-syntax">-></span><span class="element-syntax">allow_run_on</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">csp</span><span class="plain-syntax">-></span><span class="element-syntax">keyword</span><span class="plain-syntax"> = </span><span class="identifier-syntax">L</span><span class="string-syntax">"<none>"</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">csp</span><span class="plain-syntax">-></span><span class="element-syntax">is_a_loop</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="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">csp</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. </b>Some cryptic mnemonics for logging the invocation tree:
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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">ControlStructures::log</span><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="reserved-syntax">control_structure_phrase</span><span class="plain-syntax"> *</span><span class="identifier-syntax">csp</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">csp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"---"</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><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">csp</span><span class="plain-syntax">-></span><span class="element-syntax">mnemonic</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="SP4" class="paragraph-anchor"></a><b>§4. </b>The following set is built in to the Inform language; Basic Inform and such
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extensions cannot extend it.
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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">control_structure_phrase</span><span class="plain-syntax"> *</span><span class="identifier-syntax">switch_CSP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, *</span><span class="identifier-syntax">if_CSP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, *</span><span class="identifier-syntax">repeat_CSP</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="identifier-syntax">while_CSP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, *</span><span class="identifier-syntax">otherwise_CSP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, *</span><span class="identifier-syntax">abbreviated_otherwise_CSP</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="identifier-syntax">otherwise_if_CSP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, *</span><span class="identifier-syntax">default_case_CSP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, *</span><span class="identifier-syntax">case_CSP</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="identifier-syntax">say_CSP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, *</span><span class="identifier-syntax">now_CSP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, *</span><span class="identifier-syntax">instead_CSP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><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>And this is where they are all created:
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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">ControlStructures::create_standard</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">ControlStructures::create_standard</span></span>:<br/>Inbuild Control - <a href="1-ic.html#SP3">§3</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="identifier-syntax">switch_CSP</span><span class="plain-syntax"> = </span><a href="6-cs.html#SP2" class="function-link"><span class="function-syntax">ControlStructures::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"SWI"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">switch_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">body_empty_except_for_subordinates</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="identifier-syntax">switch_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">indent_subblocks</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="identifier-syntax">switch_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">requires_new_syntax</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="identifier-syntax">switch_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">keyword</span><span class="plain-syntax"> = </span><span class="identifier-syntax">L</span><span class="string-syntax">"if"</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">if_CSP</span><span class="plain-syntax"> = </span><a href="6-cs.html#SP2" class="function-link"><span class="function-syntax">ControlStructures::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"IF"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">if_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">keyword</span><span class="plain-syntax"> = </span><span class="identifier-syntax">L</span><span class="string-syntax">"if"</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">repeat_CSP</span><span class="plain-syntax"> = </span><a href="6-cs.html#SP2" class="function-link"><span class="function-syntax">ControlStructures::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"RPT"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">repeat_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">keyword</span><span class="plain-syntax"> = </span><span class="identifier-syntax">L</span><span class="string-syntax">"repeat"</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">repeat_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">is_a_loop</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="identifier-syntax">while_CSP</span><span class="plain-syntax"> = </span><a href="6-cs.html#SP2" class="function-link"><span class="function-syntax">ControlStructures::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"WHI"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">while_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">keyword</span><span class="plain-syntax"> = </span><span class="identifier-syntax">L</span><span class="string-syntax">"while"</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">while_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">is_a_loop</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="identifier-syntax">otherwise_CSP</span><span class="plain-syntax"> = </span><a href="6-cs.html#SP2" class="function-link"><span class="function-syntax">ControlStructures::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"O"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">otherwise_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">subordinate_to</span><span class="plain-syntax"> = </span><span class="identifier-syntax">if_CSP</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">otherwise_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">used_at_stage</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><span class="identifier-syntax">abbreviated_otherwise_CSP</span><span class="plain-syntax"> = </span><a href="6-cs.html#SP2" class="function-link"><span class="function-syntax">ControlStructures::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"AO"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">abbreviated_otherwise_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">subordinate_to</span><span class="plain-syntax"> = </span><span class="identifier-syntax">if_CSP</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">abbreviated_otherwise_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">used_at_stage</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><span class="identifier-syntax">otherwise_if_CSP</span><span class="plain-syntax"> = </span><a href="6-cs.html#SP2" class="function-link"><span class="function-syntax">ControlStructures::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"OIF"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">otherwise_if_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">subordinate_to</span><span class="plain-syntax"> = </span><span class="identifier-syntax">if_CSP</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">otherwise_if_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">used_at_stage</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">case_CSP</span><span class="plain-syntax"> = </span><a href="6-cs.html#SP2" class="function-link"><span class="function-syntax">ControlStructures::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"CAS"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">case_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">subordinate_to</span><span class="plain-syntax"> = </span><span class="identifier-syntax">switch_CSP</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">case_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">used_at_stage</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><span class="identifier-syntax">case_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">requires_new_syntax</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">case_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">allow_run_on</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">default_case_CSP</span><span class="plain-syntax"> = </span><a href="6-cs.html#SP2" class="function-link"><span class="function-syntax">ControlStructures::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"DEF"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">default_case_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">subordinate_to</span><span class="plain-syntax"> = </span><span class="identifier-syntax">switch_CSP</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">default_case_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">used_at_stage</span><span class="plain-syntax"> = </span><span class="constant-syntax">2</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">default_case_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">requires_new_syntax</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">default_case_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">allow_run_on</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">say_CSP</span><span class="plain-syntax"> = </span><a href="6-cs.html#SP2" class="function-link"><span class="function-syntax">ControlStructures::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"SAY"</span><span class="plain-syntax">);</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">now_CSP</span><span class="plain-syntax"> = </span><a href="6-cs.html#SP2" class="function-link"><span class="function-syntax">ControlStructures::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"NOW"</span><span class="plain-syntax">);</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">instead_CSP</span><span class="plain-syntax"> = </span><a href="6-cs.html#SP2" class="function-link"><span class="function-syntax">ControlStructures::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"INS"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>§6. </b>Control structures such as "if" act as a sort of super-punctuation inside
|
|
rule and phrase definitions, and in particular they affect the actual
|
|
punctuation of the sentences there (consider the rules about colons versus
|
|
semicolons). So, though it's still early in Inform's run, we need to seek
|
|
them out.
|
|
</p>
|
|
|
|
<p class="commentary">Here we parse the text of a command phrase which, if any, of the control
|
|
structures it might be. Note that <s-command> has a grammar partially
|
|
overlapping with this, and they need to match.
|
|
</p>
|
|
|
|
<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="constant-syntax">NO_SIGF</span><span class="plain-syntax"> </span><span class="constant-syntax">0</span>
|
|
<span class="definition-keyword">define</span> <span class="constant-syntax">SAY_SIGF</span><span class="plain-syntax"> </span><span class="constant-syntax">1</span>
|
|
<span class="definition-keyword">define</span> <span class="constant-syntax">NOW_SIGF</span><span class="plain-syntax"> </span><span class="constant-syntax">2</span>
|
|
</pre>
|
|
<pre class="Preform-displayed-code all-displayed-code code-font">
|
|
<span class="Preform-function-syntax"><control-structure-phrase></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">if</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">...</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">is</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">begin</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, switch_CSP }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">if</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">...</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">is</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, switch_CSP }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">if/unless</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">...</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, if_CSP }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">repeat</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">...</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, repeat_CSP }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">while</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">...</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, while_CSP }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">else/otherwise</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, otherwise_CSP }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">else/otherwise</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">if/unless</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">...</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, otherwise_if_CSP }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">else/otherwise</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">...</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, abbreviated_otherwise_CSP }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">--</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">otherwise</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, default_case_CSP }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">--</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">...</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, case_CSP }</span>
|
|
|
|
<span class="Preform-function-syntax"><end-control-structure-phrase></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">end</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">if/unless</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, if_CSP }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">end</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">while</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, while_CSP }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">end</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">repeat</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { -, repeat_CSP }</span>
|
|
|
|
<span class="Preform-function-syntax"><other-significant-phrase></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">say</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">...</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { SAY_SIGF, - }</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">now</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">...</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { NOW_SIGF, - }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is <a href="../words-module/4-ap.html" class="internal">Preform grammar</a>, not regular C code.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>§7. </b>This is used to see if an "if" is being used with the comma notation:
|
|
</p>
|
|
|
|
<pre class="Preform-displayed-code all-displayed-code code-font">
|
|
<span class="Preform-function-syntax"><phrase-with-comma-notation></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">......</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">,</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">......</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is <a href="../words-module/4-ap.html" class="internal">Preform grammar</a>, not regular C code.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP8" class="paragraph-anchor"></a><b>§8. </b>This is used to see if an "if" is being used with the comma notation:
|
|
</p>
|
|
|
|
<pre class="Preform-displayed-code all-displayed-code code-font">
|
|
<span class="Preform-function-syntax"><instead-keyword></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">instead</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">...</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">...</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">instead</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is <a href="../words-module/4-ap.html" class="internal">Preform grammar</a>, not regular C code.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP9" class="paragraph-anchor"></a><b>§9. </b>Finally, this is used to see if a control structure opens a block:
|
|
</p>
|
|
|
|
<pre class="Preform-displayed-code all-displayed-code code-font">
|
|
<span class="Preform-function-syntax"><phrase-beginning-block></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">...</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">begin</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is <a href="../words-module/4-ap.html" class="internal">Preform grammar</a>, not regular C code.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP10" class="paragraph-anchor"></a><b>§10. </b>And some miscellaneous provisions:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">ControlStructures::comma_possible</span><span class="plain-syntax">(</span><span class="reserved-syntax">control_structure_phrase</span><span class="plain-syntax"> *</span><span class="identifier-syntax">csp</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">csp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">if_CSP</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">csp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">switch_CSP</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">csp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">otherwise_if_CSP</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">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="function-syntax">ControlStructures::is_a_loop</span><span class="plain-syntax">(</span><span class="reserved-syntax">control_structure_phrase</span><span class="plain-syntax"> *</span><span class="identifier-syntax">csp</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">csp</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">csp</span><span class="plain-syntax">-></span><span class="element-syntax">is_a_loop</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="function-syntax">ControlStructures::opens_block</span><span class="plain-syntax">(</span><span class="reserved-syntax">control_structure_phrase</span><span class="plain-syntax"> *</span><span class="identifier-syntax">csp</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">csp</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">csp</span><span class="plain-syntax">-></span><span class="element-syntax">subordinate_to</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">csp</span><span class="plain-syntax"> != </span><span class="identifier-syntax">say_CSP</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">csp</span><span class="plain-syntax"> != </span><span class="identifier-syntax">now_CSP</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">csp</span><span class="plain-syntax"> != </span><span class="identifier-syntax">instead_CSP</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="function-syntax">ControlStructures::permits_break</span><span class="plain-syntax">(</span><span class="reserved-syntax">control_structure_phrase</span><span class="plain-syntax"> *</span><span class="identifier-syntax">csp</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">csp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">repeat_CSP</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">csp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">while_CSP</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="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="function-syntax">ControlStructures::incipit</span><span class="plain-syntax">(</span><span class="reserved-syntax">control_structure_phrase</span><span class="plain-syntax"> *</span><span class="identifier-syntax">csp</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">csp</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">csp</span><span class="plain-syntax">-></span><span class="element-syntax">keyword</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">L</span><span class="string-syntax">"<none>"</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">control_structure_phrase</span><span class="plain-syntax"> *</span><span class="function-syntax">ControlStructures::detect</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="function-syntax"><control-structure-phrase></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="function-syntax"><<rp>></span><span class="plain-syntax"> == </span><span class="identifier-syntax">abbreviated_otherwise_CSP</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="function-syntax"><<rp>></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>
|
|
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">ControlStructures::abbreviated_otherwise</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="function-syntax"><control-structure-phrase></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="function-syntax"><<rp>></span><span class="plain-syntax"> == </span><span class="identifier-syntax">abbreviated_otherwise_CSP</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="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">control_structure_phrase</span><span class="plain-syntax"> *</span><span class="function-syntax">ControlStructures::detect_end</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="function-syntax"><end-control-structure-phrase></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="function-syntax"><<rp>></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>
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<span class="plain-syntax">}</span>
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</pre>
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