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<!--Weave of 'Compilation Schemas' generated by Inweb-->
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../services.html">Services</a></li><li><a href="index.html">calculus</a></li><li><a href="index.html#3">Chapter 3: Binary Predicates</a></li><li><b>Compilation Schemas</b></li></ul></div>
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<p class="purpose">To manage prototype pieces of code for use in code-generation.</p>
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<ul class="toc"><li><a href="3-cs.html#SP1">§1. Schemas</a></li><li><a href="3-cs.html#SP3">§3. Annotated schemas</a></li><li><a href="3-cs.html#SP5">§5. Building schemas</a></li><li><a href="3-cs.html#SP6">§6. Emptiness</a></li><li><a href="3-cs.html#SP7">§7. Logging schemas</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. Schemas. </b>The calculus module should not in any direct way be involved in code
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generation; on the other hand, predicates and quantifiers need eventually to
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result in compiled code, and that code will look different for different
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predicates. There has to be some way to systematically handle those differences.
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</p>
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<p class="commentary">Code in the Inform compiler is generated largely from "schemas", which are
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small model pieces of code used with variations in different settings. There
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are two different data structures for these:
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</p>
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<ul class="items"><li>(a) An <span class="extract"><span class="extract-syntax">i6_schema</span></span> uses textual notation based on the syntax of the C-like
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language Inform 6; to be used, this must be converted to
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</li><li>(b) An <span class="extract"><span class="extract-syntax">inter_schema</span></span>, which is a partly compiled form of the same, and
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has a tree structure closer to the final Inter code.
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</li></ul>
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<p class="commentary">For inter schemas and how the conversion of (a) to (b) is done, see the
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Inform compiler source at <a href="../building-module/2-is.html" class="internal">Inter Schemas (in building)</a>. If this calculus
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module is used outside of Inform, of course, no <span class="extract"><span class="extract-syntax">inter_schema</span></span> will exist.
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</p>
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<p class="commentary">A simple example of an <span class="extract"><span class="extract-syntax">i6_schema</span></span> might use the notation <span class="extract"><span class="extract-syntax">*1 == *2</span></span>; this
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will ultimately compile to a test that two quantities are numerically equal.
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As this example shows, <span class="extract"><span class="extract-syntax">*</span></span> is an escape character. See <a href="../building-module/2-is.html" class="internal">Inter Schemas (in building)</a>;
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<span class="extract"><span class="extract-syntax">*1</span></span> is an example of what is called an "abbreviated command" there.
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</p>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>The <a href="3-cs.html#SP2" class="internal">i6_schema</a> structure is very simple, then. Schemas can be of unlimited
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length, but we want to be able to create and dispose of them quickly and to
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avoid unnecessary stream memory claims. So each <span class="extract"><span class="extract-syntax">i6_schema</span></span> structure contains
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a fixed block of storage for the first few characters. (In fact, long ones are
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never needed in practice, but we must avoid any risk of buffer overrun for safety.)
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</p>
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<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="constant-syntax">TYPICAL_I6_SCHEMA_LENGTH</span><span class="plain-syntax"> </span><span class="constant-syntax">128</span><span class="plain-syntax"> </span><span class="comment-syntax"> in practice 40 is plenty</span>
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</pre>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">i6_schema</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">prototype_storage</span><span class="plain-syntax">[</span><span class="constant-syntax">TYPICAL_I6_SCHEMA_LENGTH</span><span class="plain-syntax">]; </span><span class="comment-syntax"> used just to make space for...</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">prototype</span><span class="plain-syntax">; </span><span class="comment-syntax"> ...this</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">no_quoted_inames</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">CORE_MODULE</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">inter_schema</span><span class="plain-syntax"> *</span><span class="identifier-syntax">compiled</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">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">quoted_inames</span><span class="plain-syntax">[2];</span>
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<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">i6_schema</span><span class="plain-syntax">;</span>
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</pre>
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<ul class="endnotetexts"><li>The structure i6_schema is private to this section.</li></ul>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. Annotated schemas. </b>It is sometimes convenient to carry around a schema together with calculus
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terms for what will go into <span class="extract"><span class="extract-syntax">*1</span></span> and <span class="extract"><span class="extract-syntax">*2</span></span> when it is expanded, and with a
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few other contextual details.
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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">annotated_i6_schema</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">i6_schema</span><span class="plain-syntax"> *</span><span class="identifier-syntax">schema</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">negate_schema</span><span class="plain-syntax">; </span><span class="comment-syntax"> true if atom is to be tested with the opposite parity</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">pcalc_term</span><span class="plain-syntax"> </span><span class="identifier-syntax">pt0</span><span class="plain-syntax">; </span><span class="comment-syntax"> terms on which the I6 schema is to be expanded</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">pcalc_term</span><span class="plain-syntax"> </span><span class="identifier-syntax">pt1</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">involves_action_variables</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">annotated_i6_schema</span><span class="plain-syntax">;</span>
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</pre>
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<ul class="endnotetexts"><li>The structure annotated_i6_schema is accessed in 3/bpf and here.</li></ul>
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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. </b>And here it is, before being annotated...
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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">annotated_i6_schema</span><span class="plain-syntax"> </span><span class="function-syntax">Calculus::Schemas::blank_asch</span><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">annotated_i6_schema</span><span class="plain-syntax"> </span><span class="identifier-syntax">asch</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">asch</span><span class="plain-syntax">.</span><span class="element-syntax">schema</span><span class="plain-syntax"> = </span><a href="3-cs.html#SP5" class="function-link"><span class="function-syntax">Calculus::Schemas::new</span></a><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="identifier-syntax">asch</span><span class="plain-syntax">.</span><span class="element-syntax">negate_schema</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">asch</span><span class="plain-syntax">.</span><span class="element-syntax">pt0</span><span class="plain-syntax"> = </span><a href="4-trm.html#SP4" class="function-link"><span class="function-syntax">Terms::new_variable</span></a><span class="plain-syntax">(0);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">asch</span><span class="plain-syntax">.</span><span class="element-syntax">pt1</span><span class="plain-syntax"> = </span><a href="4-trm.html#SP4" class="function-link"><span class="function-syntax">Terms::new_variable</span></a><span class="plain-syntax">(0);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">asch</span><span class="plain-syntax">.</span><span class="element-syntax">involves_action_variables</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">asch</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>§5. Building schemas. </b>When schemas are generated inside Inform, they often look as if they have an
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even more elaborate syntax, with escapes like <span class="extract"><span class="extract-syntax">%s</span></span> in them. But this is because
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they are generated with the following <span class="extract"><span class="extract-syntax">printf</span></span>-style function. Those <span class="extract"><span class="extract-syntax">%</span></span> escapes
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are expanded now, when the schema is created, and not later when code is generated
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from it. For example, the function call:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="function-syntax">Calculus::Schemas::new</span><span class="plain-syntax">(</span><span class="string-syntax">"*1.%n = *2.%n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">X</span><span class="plain-syntax">, </span><span class="identifier-syntax">Y</span><span class="plain-syntax">)</span>
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</pre>
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<p class="commentary">might produce a schema whose <span class="extract"><span class="extract-syntax">prototype</span></span> text came out as
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax">*1.x100 = *2.y62</span>
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</pre>
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<p class="commentary">...supposing that <span class="extract"><span class="extract-syntax">x100</span></span> and <span class="extract"><span class="extract-syntax">y62</span></span> were the Inter identifiers for whatever was
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referred to by the <span class="extract"><span class="extract-syntax">inter_name</span></span> values <span class="extract"><span class="extract-syntax">X</span></span> and <span class="extract"><span class="extract-syntax">Y</span></span> supplied in the arguments.
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Here then is that <span class="extract"><span class="extract-syntax">printf</span></span>-like function:
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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">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">unique_qi_counter</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">; </span><span class="comment-syntax"> quoted iname count</span>
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<span class="reserved-syntax">i6_schema</span><span class="plain-syntax"> *</span><span class="function-syntax">Calculus::Schemas::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">Calculus::Schemas::new</span></span>:<br/><a href="3-cs.html#SP4">§4</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">fmt</span><span class="plain-syntax">, ...) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">va_list</span><span class="plain-syntax"> </span><span class="identifier-syntax">ap</span><span class="plain-syntax">; </span><span class="comment-syntax"> the variable argument list signified by the dots</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">i6_schema</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sch</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">i6_schema</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">sch</span><span class="plain-syntax">-></span><span class="element-syntax">prototype</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Streams::new_buffer</span><span class="plain-syntax">(</span><span class="constant-syntax">TYPICAL_I6_SCHEMA_LENGTH</span><span class="plain-syntax">, </span><span class="identifier-syntax">sch</span><span class="plain-syntax">-></span><span class="element-syntax">prototype_storage</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">sch</span><span class="plain-syntax">-></span><span class="element-syntax">no_quoted_inames</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">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">OUT</span><span class="plain-syntax"> = &(</span><span class="identifier-syntax">sch</span><span class="plain-syntax">-></span><span class="element-syntax">prototype</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-cs.html#SP5_3" class="named-paragraph-link"><span class="named-paragraph">Process the varargs into schema prototype text</span><span class="named-paragraph-number">5.3</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">va_end</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">); </span><span class="comment-syntax"> macro to end variable argument processing</span>
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<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">CORE_MODULE</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">sch</span><span class="plain-syntax">-></span><span class="element-syntax">compiled</span><span class="plain-syntax"> = </span><span class="identifier-syntax">ParsingSchemas::from_i6s</span><span class="plain-syntax">(&(</span><span class="identifier-syntax">sch</span><span class="plain-syntax">-></span><span class="element-syntax">prototype</span><span class="plain-syntax">),</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">sch</span><span class="plain-syntax">-></span><span class="element-syntax">no_quoted_inames</span><span class="plain-syntax">, (</span><span class="reserved-syntax">void</span><span class="plain-syntax"> **) </span><span class="identifier-syntax">sch</span><span class="plain-syntax">-></span><span class="element-syntax">quoted_inames</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</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">sch</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP5_1" class="paragraph-anchor"></a><b>§5.1. </b>And this is a variation for modifying an existing schema:
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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">Calculus::Schemas::modify</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">Calculus::Schemas::modify</span></span>:<br/>Binary Predicates - <a href="3-bp.html#SP18_1">§18.1</a>, <a href="3-bp.html#SP18_2">§18.2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">i6_schema</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sch</span><span class="plain-syntax">, </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">fmt</span><span class="plain-syntax">, ...) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">va_list</span><span class="plain-syntax"> </span><span class="identifier-syntax">ap</span><span class="plain-syntax">; </span><span class="comment-syntax"> the variable argument list signified by the dots</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">sch</span><span class="plain-syntax">-></span><span class="element-syntax">prototype</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Streams::new_buffer</span><span class="plain-syntax">(</span><span class="constant-syntax">TYPICAL_I6_SCHEMA_LENGTH</span><span class="plain-syntax">, </span><span class="identifier-syntax">sch</span><span class="plain-syntax">-></span><span class="element-syntax">prototype_storage</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">sch</span><span class="plain-syntax">-></span><span class="element-syntax">no_quoted_inames</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">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">OUT</span><span class="plain-syntax"> = &(</span><span class="identifier-syntax">sch</span><span class="plain-syntax">-></span><span class="element-syntax">prototype</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-cs.html#SP5_3" class="named-paragraph-link"><span class="named-paragraph">Process the varargs into schema prototype text</span><span class="named-paragraph-number">5.3</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">va_end</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">); </span><span class="comment-syntax"> macro to end variable argument processing</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">CORE_MODULE</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">sch</span><span class="plain-syntax">-></span><span class="element-syntax">compiled</span><span class="plain-syntax"> = </span><span class="identifier-syntax">ParsingSchemas::from_i6s</span><span class="plain-syntax">(&(</span><span class="identifier-syntax">sch</span><span class="plain-syntax">-></span><span class="element-syntax">prototype</span><span class="plain-syntax">),</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">sch</span><span class="plain-syntax">-></span><span class="element-syntax">no_quoted_inames</span><span class="plain-syntax">, (</span><span class="reserved-syntax">void</span><span class="plain-syntax"> **) </span><span class="identifier-syntax">sch</span><span class="plain-syntax">-></span><span class="element-syntax">quoted_inames</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP5_2" class="paragraph-anchor"></a><b>§5.2. </b>And another:
|
|
</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">Calculus::Schemas::append</span><span class="plain-syntax">(</span><span class="reserved-syntax">i6_schema</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sch</span><span class="plain-syntax">, </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">fmt</span><span class="plain-syntax">, ...) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">va_list</span><span class="plain-syntax"> </span><span class="identifier-syntax">ap</span><span class="plain-syntax">; </span><span class="comment-syntax"> the variable argument list signified by the dots</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="identifier-syntax">sch</span><span class="plain-syntax">-></span><span class="element-syntax">prototype</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-cs.html#SP5_3" class="named-paragraph-link"><span class="named-paragraph">Process the varargs into schema prototype text</span><span class="named-paragraph-number">5.3</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">va_end</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">); </span><span class="comment-syntax"> macro to end variable argument processing</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">CORE_MODULE</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">sch</span><span class="plain-syntax">-></span><span class="element-syntax">compiled</span><span class="plain-syntax"> = </span><span class="identifier-syntax">ParsingSchemas::from_i6s</span><span class="plain-syntax">(&(</span><span class="identifier-syntax">sch</span><span class="plain-syntax">-></span><span class="element-syntax">prototype</span><span class="plain-syntax">),</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">sch</span><span class="plain-syntax">-></span><span class="element-syntax">no_quoted_inames</span><span class="plain-syntax">, (</span><span class="reserved-syntax">void</span><span class="plain-syntax"> **) </span><span class="identifier-syntax">sch</span><span class="plain-syntax">-></span><span class="element-syntax">quoted_inames</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP5_3" class="paragraph-anchor"></a><b>§5.3. </b>Either way, the schema's prototype is written as follows:
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Process the varargs into schema prototype text</span><span class="named-paragraph-number">5.3</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">p</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">va_start</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">, </span><span class="identifier-syntax">fmt</span><span class="plain-syntax">); </span><span class="comment-syntax"> macro to begin variable argument processing</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="identifier-syntax">p</span><span class="plain-syntax"> = </span><span class="identifier-syntax">fmt</span><span class="plain-syntax">; *</span><span class="identifier-syntax">p</span><span class="plain-syntax">; </span><span class="identifier-syntax">p</span><span class="plain-syntax">++) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">switch</span><span class="plain-syntax"> (*</span><span class="identifier-syntax">p</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="character-syntax">'%'</span><span class="plain-syntax">: </span><span class="named-paragraph-container code-font"><a href="3-cs.html#SP5_3_1" class="named-paragraph-link"><span class="named-paragraph">Recognise schema-format escape sequences</span><span class="named-paragraph-number">5.3.1</span></a></span><span class="plain-syntax">; </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">default:</span><span class="plain-syntax"> </span><span class="identifier-syntax">PUT</span><span class="plain-syntax">(*</span><span class="identifier-syntax">p</span><span class="plain-syntax">); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="3-cs.html#SP5">§5</a>, <a href="3-cs.html#SP5_1">§5.1</a>, <a href="3-cs.html#SP5_2">§5.2</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP5_3_1" class="paragraph-anchor"></a><b>§5.3.1. </b>We recognise only a few escapes here: <span class="extract"><span class="extract-syntax">%%</span></span>, a literal percentage sign; <span class="extract"><span class="extract-syntax">%d</span></span>,
|
|
an integer; <span class="extract"><span class="extract-syntax">%s</span></span>, a C string; <span class="extract"><span class="extract-syntax">%S</span></span>, a text stream; and three which are higher-level:
|
|
</p>
|
|
|
|
<ul class="items"><li>(a) <span class="extract"><span class="extract-syntax">%k</span></span> takes a <span class="extract"><span class="extract-syntax">kind</span></span> parameter and expands to its weak ID;
|
|
</li><li>(b) <span class="extract"><span class="extract-syntax">%L</span></span> takes a <span class="extract"><span class="extract-syntax">local_variable</span></span> and expands to its identifier;
|
|
</li><li>(c) <span class="extract"><span class="extract-syntax">%n</span></span> takes an <span class="extract"><span class="extract-syntax">inter_name</span></span>, which expands more cautiously in a way which
|
|
stores the actual <span class="extract"><span class="extract-syntax">inter_name</span></span> reference: it is possible for two different
|
|
global values to have different <span class="extract"><span class="extract-syntax">inter_name</span></span>s but the same identifier text,
|
|
so it would not be safe to store only the textual identifier.
|
|
</li></ul>
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Recognise schema-format escape sequences</span><span class="named-paragraph-number">5.3.1</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">p</span><span class="plain-syntax">++;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">switch</span><span class="plain-syntax"> (*</span><span class="identifier-syntax">p</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="character-syntax">'d'</span><span class="plain-syntax">: </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%d"</span><span class="plain-syntax">, </span><span class="identifier-syntax">va_arg</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax">)); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="character-syntax">'k'</span><span class="plain-syntax">:</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">CORE_MODULE</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">RTKindIDs::write_weak_identifier</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">va_arg</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *));</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">ifndef</span><span class="plain-syntax"> </span><span class="identifier-syntax">CORE_MODULE</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"{%u}"</span><span class="plain-syntax">, </span><span class="identifier-syntax">va_arg</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *));</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="character-syntax">'L'</span><span class="plain-syntax">:</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">CORE_MODULE</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%~L"</span><span class="plain-syntax">, </span><span class="identifier-syntax">va_arg</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">, </span><span class="identifier-syntax">local_variable</span><span class="plain-syntax"> *)); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">ifndef</span><span class="plain-syntax"> </span><span class="identifier-syntax">CORE_MODULE</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%08x"</span><span class="plain-syntax">, </span><span class="identifier-syntax">va_arg</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">, </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *)); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="character-syntax">'n'</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="identifier-syntax">sch</span><span class="plain-syntax">-></span><span class="element-syntax">no_quoted_inames</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"> >= </span><span class="constant-syntax">2</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"too many inter_name quotes"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">CORE_MODULE</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">sch</span><span class="plain-syntax">-></span><span class="element-syntax">quoted_inames</span><span class="plain-syntax">[</span><span class="identifier-syntax">N</span><span class="plain-syntax">] = (</span><span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *) </span><span class="identifier-syntax">va_arg</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *);</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"QUOTED_INAME_%d_%08x"</span><span class="plain-syntax">, </span><span class="identifier-syntax">N</span><span class="plain-syntax">, </span><span class="identifier-syntax">unique_qi_counter</span><span class="plain-syntax">++);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="character-syntax">'N'</span><span class="plain-syntax">: </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%N"</span><span class="plain-syntax">, </span><span class="identifier-syntax">va_arg</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax">)); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="character-syntax">'s'</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">va_arg</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">, </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *)); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="character-syntax">'S'</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">va_arg</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">, </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *)); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="character-syntax">'%'</span><span class="plain-syntax">: </span><span class="identifier-syntax">PUT</span><span class="plain-syntax">(</span><span class="character-syntax">'%'</span><span class="plain-syntax">); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">default:</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">fprintf</span><span class="plain-syntax">(</span><span class="identifier-syntax">stderr</span><span class="plain-syntax">, </span><span class="string-syntax">"*** Bad schema format: <%s> ***\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">fmt</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"Unknown % string escape in schema format"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="3-cs.html#SP5_3">§5.3</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>§6. Emptiness. </b>A schema is empty if its prototype is the empty text.
|
|
</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">Calculus::Schemas::empty</span><span class="plain-syntax">(</span><span class="reserved-syntax">i6_schema</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sch</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">sch</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">Str::len</span><span class="plain-syntax">(&(</span><span class="identifier-syntax">sch</span><span class="plain-syntax">-></span><span class="element-syntax">prototype</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>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>§7. Logging schemas. </b>The fact that I6 schemas are not much more than string makes them easy to log:
|
|
</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">Calculus::Schemas::log</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">Calculus::Schemas::log</span></span>:<br/>Calculus Module - <a href="1-cm.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">i6_schema</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sch</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><a href="3-cs.html#SP7" class="function-link"><span class="function-syntax">Calculus::Schemas::write</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">DL</span><span class="plain-syntax">, </span><span class="identifier-syntax">sch</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">Calculus::Schemas::write</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="reserved-syntax">i6_schema</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sch</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">sch</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">"<null schema>"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"<schema: %S>"</span><span class="plain-syntax">, &(</span><span class="identifier-syntax">sch</span><span class="plain-syntax">-></span><span class="element-syntax">prototype</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">Calculus::Schemas::log_applied</span><span class="plain-syntax">(</span><span class="reserved-syntax">i6_schema</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sch</span><span class="plain-syntax">, </span><span class="reserved-syntax">pcalc_term</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pt1</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><a href="3-cs.html#SP7" class="function-link"><span class="function-syntax">Calculus::Schemas::write_applied</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">DL</span><span class="plain-syntax">, </span><span class="identifier-syntax">sch</span><span class="plain-syntax">, </span><span class="identifier-syntax">pt1</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Calculus::Schemas::write_applied</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">Calculus::Schemas::write_applied</span></span>:<br/>Terms - <a href="4-trm.html#SP11">§11</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="reserved-syntax">i6_schema</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sch</span><span class="plain-syntax">, </span><span class="reserved-syntax">pcalc_term</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pt1</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">sch</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">"<null schema>"</span><span class="plain-syntax">); </span><span class="reserved-syntax">return</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>
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<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">sch</span><span class="plain-syntax">-></span><span class="element-syntax">prototype</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><a href="4-trm.html#SP11" class="function-link"><span class="function-syntax">Terms::write</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">pt1</span><span class="plain-syntax">);</span>
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<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>
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<span class="plain-syntax">}</span>
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</pre>
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