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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../intern.html">Inter Modules</a></li><li><a href="index.html">bytecode</a></li><li><a href="index.html#6">Chapter 6: Pseudo-Constructs</a></li><li><b>The Plug Construct</b></li></ul></div>
<p class="purpose">Defining the symbol construct.</p>
<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. </b>This is a pseudo-construct: it looks like an instruction in textual Inter
syntax, but specifies something else, and does not result in an <span class="extract"><span class="extract-syntax">inter_tree_node</span></span>.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">PlugInstruction::define_construct</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">PlugInstruction::define_construct</span></span>:<br/>Inter Constructs - <a href="3-ic.html#SP15">&#167;15</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_construct</span><span class="plain-syntax"> *</span><span class="identifier-syntax">IC</span><span class="plain-syntax"> = </span><a href="3-ic.html#SP1" class="function-link"><span class="function-syntax">InterInstruction::create_construct</span></a><span class="plain-syntax">(</span><span class="constant-syntax">PLUG_IST</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"plug"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="3-ic.html#SP8" class="function-link"><span class="function-syntax">InterInstruction::specify_syntax</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">IC</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"plug IDENTIFIER TOKENS"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">IC</span><span class="plain-syntax">, </span><span class="constant-syntax">CONSTRUCT_READ_MTID</span><span class="plain-syntax">, </span><a href="6-tpc.html#SP2" class="function-link"><span class="function-syntax">PlugInstruction::read</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">IC</span><span class="plain-syntax">, </span><span class="constant-syntax">CONSTRUCT_VERIFY_MTID</span><span class="plain-syntax">, </span><a href="6-tpc.html#SP1" class="function-link"><span class="function-syntax">PlugInstruction::verify</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="3-ic.html#SP3" class="function-link"><span class="function-syntax">InterInstruction::allow_in_depth_range</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">IC</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="constant-syntax">1</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="3-ic.html#SP3" class="function-link"><span class="function-syntax">InterInstruction::permit</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">IC</span><span class="plain-syntax">, </span><span class="constant-syntax">INSIDE_PLAIN_PACKAGE_ICUP</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">PlugInstruction::verify</span><span class="plain-syntax">(</span><span class="reserved-syntax">inter_construct</span><span class="plain-syntax"> *</span><span class="identifier-syntax">IC</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_package</span><span class="plain-syntax"> *</span><span class="identifier-syntax">owner</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_error_message</span><span class="plain-syntax"> **</span><span class="identifier-syntax">E</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> *</span><span class="identifier-syntax">E</span><span class="plain-syntax"> = </span><a href="2-in.html#SP15" class="function-link"><span class="function-syntax">Inode::error</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"PLUG_IST structures cannot exist"</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>&#167;2. </b>What it does is to specify a symbol which is a plug in the current tree:
this results in an entry in the symbols table for the current package (which
will always be <span class="extract"><span class="extract-syntax">/main/connectors</span></span>, in fact) but not an instruction.
</p>
<p class="commentary">Surprisingly, this can actually result in a socket rather than a plug, but
only in the case where the plug asks to wire to something existing in the current
tree already.
</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">PlugInstruction::read</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">PlugInstruction::read</span></span>:<br/><a href="6-tpc.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_construct</span><span class="plain-syntax"> *</span><span class="identifier-syntax">IC</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_bookmark</span><span class="plain-syntax"> *</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_line_parse</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ilp</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_error_location</span><span class="plain-syntax"> *</span><span class="identifier-syntax">eloc</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_error_message</span><span class="plain-syntax"> **</span><span class="identifier-syntax">E</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">symbol_text</span><span class="plain-syntax"> = </span><span class="identifier-syntax">ilp</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">mr</span><span class="plain-syntax">.</span><span class="identifier-syntax">exp</span><span class="plain-syntax">[0];</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">equate_text</span><span class="plain-syntax"> = </span><span class="identifier-syntax">ilp</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">mr</span><span class="plain-syntax">.</span><span class="identifier-syntax">exp</span><span class="plain-syntax">[1];</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_tree</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</span><span class="plain-syntax"> = </span><a href="2-bkm.html#SP7" class="function-link"><span class="function-syntax">InterBookmark::tree</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_symbols_table</span><span class="plain-syntax"> *</span><span class="identifier-syntax">T</span><span class="plain-syntax"> = </span><a href="2-bkm.html#SP7" class="function-link"><span class="function-syntax">InterBookmark::scope</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">plug_s</span><span class="plain-syntax"> = </span><a href="3-iitf.html#SP4" class="function-link"><span class="function-syntax">TextualInter::new_symbol</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">eloc</span><span class="plain-syntax">, </span><span class="identifier-syntax">T</span><span class="plain-syntax">, </span><span class="identifier-syntax">symbol_text</span><span class="plain-syntax">, </span><span class="identifier-syntax">E</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">E</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><a href="2-sym.html#SP13" class="function-link"><span class="function-syntax">InterSymbol::make_plug</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">plug_s</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">equate_name</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="identifier-syntax">to_name</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">match_results</span><span class="plain-syntax"> </span><span class="identifier-syntax">mr</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Regexp::create_mr</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">Regexp::match</span><span class="plain-syntax">(&amp;</span><span class="identifier-syntax">mr</span><span class="plain-syntax">, </span><span class="identifier-syntax">equate_text</span><span class="plain-syntax">, </span><span class="identifier-syntax">L</span><span class="string-syntax">"~~&gt; \"(%C+)\""</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">equate_name</span><span class="plain-syntax"> = </span><span class="identifier-syntax">mr</span><span class="plain-syntax">.</span><span class="identifier-syntax">exp</span><span class="plain-syntax">[0];</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">to_name</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">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Regexp::match</span><span class="plain-syntax">(&amp;</span><span class="identifier-syntax">mr</span><span class="plain-syntax">, </span><span class="identifier-syntax">equate_text</span><span class="plain-syntax">, </span><span class="identifier-syntax">L</span><span class="string-syntax">"~~&gt; (%C+)"</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">equate_name</span><span class="plain-syntax"> = </span><span class="identifier-syntax">mr</span><span class="plain-syntax">.</span><span class="identifier-syntax">exp</span><span class="plain-syntax">[0];</span>
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Regexp::dispose_of</span><span class="plain-syntax">(&amp;</span><span class="identifier-syntax">mr</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> *</span><span class="identifier-syntax">E</span><span class="plain-syntax"> = </span><a href="3-ie.html#SP4" class="function-link"><span class="function-syntax">InterErrors::plain</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"bad plug syntax"</span><span class="plain-syntax">, </span><span class="identifier-syntax">eloc</span><span class="plain-syntax">); </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</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">to_name</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><a href="2-tw2.html#SP14" class="function-link"><span class="function-syntax">Wiring::make_plug_wanting_identifier</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">plug_s</span><span class="plain-syntax">, </span><span class="identifier-syntax">equate_name</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">eq_s</span><span class="plain-syntax"> = </span><a href="2-st.html#SP19" class="function-link"><span class="function-syntax">InterSymbolsTable::URL_to_symbol</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">equate_name</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">eq_s</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><a href="2-tw2.html#SP7" class="function-link"><span class="function-syntax">Wiring::wire_to_name</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">plug_s</span><span class="plain-syntax">, </span><span class="identifier-syntax">equate_name</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><a href="2-tw2.html#SP13" class="function-link"><span class="function-syntax">Wiring::make_socket_to</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">plug_s</span><span class="plain-syntax">, </span><span class="identifier-syntax">eq_s</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Regexp::dispose_of</span><span class="plain-syntax">(&amp;</span><span class="identifier-syntax">mr</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>&#167;3. </b>The following writes a valid line of textual Inter to declare a plug or socket,
appearing at level <span class="extract"><span class="extract-syntax">N</span></span> in the hierarchy.
</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">PlugInstruction::write_declaration</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">PlugInstruction::write_declaration</span></span>:<br/>The Package Construct - <a href="4-tpc.html#SP8">&#167;8</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</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="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">L</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">L</span><span class="plain-syntax">&lt;</span><span class="identifier-syntax">N</span><span class="plain-syntax">; </span><span class="identifier-syntax">L</span><span class="plain-syntax">++) </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"\t"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">switch</span><span class="plain-syntax"> (</span><a href="2-sym.html#SP5" class="function-link"><span class="function-syntax">InterSymbol::get_type</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">PLUG_ISYMT:</span><span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"plug"</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="identifier-syntax">SOCKET_ISYMT:</span><span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"socket"</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">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"not a connector"</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="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" %S"</span><span class="plain-syntax">, </span><a href="2-sym.html#SP19" class="function-link"><span class="function-syntax">InterSymbol::identifier</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">));</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="2-tw2.html#SP7" class="function-link"><span class="function-syntax">Wiring::is_wired_to_name</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" ~~&gt; \"%S\""</span><span class="plain-syntax">, </span><a href="2-tw2.html#SP7" class="function-link"><span class="function-syntax">Wiring::wired_to_name</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">));</span>
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="2-tw2.html#SP2" class="function-link"><span class="function-syntax">Wiring::is_wired</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" ~~&gt; "</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-st.html#SP18" class="function-link"><span class="function-syntax">InterSymbolsTable::write_symbol_URL</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><a href="2-tw2.html#SP2" class="function-link"><span class="function-syntax">Wiring::wired_to</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">));</span>
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" ?"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax">}</span>
</pre>
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