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102 lines
9.6 KiB
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<title>3/tm2</title>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta http-equiv="Content-Language" content="en-gb">
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<link href="inweb.css" rel="stylesheet" rev="stylesheet" type="text/css">
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</head>
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<body>
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<!--Weave of '3/ts' generated by 7-->
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<ul class="crumbs"><li><a href="../webs.html">★</a></li><li><a href="index.html">if</a></li><li><a href="index.html#3">Chapter 3: Space and Time</a></li><li><b>The Score</b></li></ul><p class="purpose">A plugin to support the maximum score variable.</p>
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<ul class="toc"><li><a href="#SP1">§1. Definitions</a></li><li><a href="#SP3">§3. Initialisation</a></li><li><a href="#SP4">§4. The maximum score and rankings table</a></li></ul><hr class="tocbar">
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<p class="inwebparagraph"><a id="SP1"></a><b>§1. Definitions. </b></p>
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<p class="inwebparagraph"><a id="SP2"></a><b>§2. </b>For many years this was a defined I6 constant, but then people sent in bug
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reports asking why it wouldn't change in play.
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</p>
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<pre class="display">
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<span class="identifier">nonlocal_variable</span><span class="plain"> *</span><span class="identifier">max_score_VAR</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="inwebparagraph"><a id="SP3"></a><b>§3. Initialisation. </b></p>
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<pre class="display">
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">PL::Score::start</span><span class="plain">(</span><span class="reserved">void</span><span class="plain">) {</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function PL::Score::start appears nowhere else.</p>
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<p class="inwebparagraph"><a id="SP4"></a><b>§4. The maximum score and rankings table. </b>A special rule is that if a table is called "Rankings" and contains a column
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of numbers followed by a column of text, then it is used by the run-time
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scoring system. In retrospect, Inform really shouldn't support this at the
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compiler level (not that it does much), and in any case it's a very old-school
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idea of IF. Still, it does little harm.
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</p>
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<pre class="display">
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<span class="plain"><</span><span class="identifier">rankings</span><span class="plain">-</span><span class="identifier">table</span><span class="plain">-</span><span class="identifier">name</span><span class="plain">> ::=</span>
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<span class="identifier">rankings</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="inwebparagraph"><a id="SP5"></a><b>§5. </b>This can only happen if we declare it somehow in I6 code, which
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we do with the constant <code class="display"><span class="extract">RANKING_TABLE</span></code>. We also set the <code class="display"><span class="extract">MAX_SCORE</span></code> variable
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equal to the number in the bottom row of the table, which is assumed to be the
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score corresponding to successful completion and the highest rank.
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</p>
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<pre class="display">
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">PL::Score::compile_max_score</span><span class="plain">(</span><span class="reserved">void</span><span class="plain">) {</span>
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<span class="identifier">table</span><span class="plain"> *</span><span class="identifier">t</span><span class="plain">;</span>
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<span class="identifier">LOOP_OVER</span><span class="plain">(</span><span class="identifier">t</span><span class="plain">, </span><span class="identifier">table</span><span class="plain">) {</span>
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<span class="reserved">if</span><span class="plain"> ((<</span><span class="identifier">rankings</span><span class="plain">-</span><span class="identifier">table</span><span class="plain">-</span><span class="identifier">name</span><span class="plain">>(</span><span class="identifier">t</span><span class="plain">-></span><span class="identifier">table_name_text</span><span class="plain">)) &&</span>
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<span class="plain">(</span><span class="identifier">Tables::get_no_columns</span><span class="plain">(</span><span class="identifier">t</span><span class="plain">) >= 2) &&</span>
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<span class="plain">(</span><span class="identifier">Kinds::Compare::eq</span><span class="plain">(</span><span class="identifier">Tables::kind_of_ith_column</span><span class="plain">(</span><span class="identifier">t</span><span class="plain">, 0), </span><span class="identifier">K_number</span><span class="plain">)) &&</span>
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<span class="plain">(</span><span class="identifier">Kinds::Compare::eq</span><span class="plain">(</span><span class="identifier">Tables::kind_of_ith_column</span><span class="plain">(</span><span class="identifier">t</span><span class="plain">, 1), </span><span class="identifier">K_text</span><span class="plain">))) {</span>
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<span class="identifier">InterNames::to_symbol</span><span class="plain">(</span><span class="identifier">Tables::identifier</span><span class="plain">(</span><span class="identifier">t</span><span class="plain">));</span>
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<span class="identifier">Emit::named_iname_constant</span><span class="plain">(</span><span class="identifier">InterNames::iname</span><span class="plain">(</span><span class="identifier">RANKING_TABLE_INAME</span><span class="plain">), </span><span class="identifier">K_value</span><span class="plain">, </span><span class="identifier">Tables::identifier</span><span class="plain">(</span><span class="identifier">t</span><span class="plain">));</span>
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<span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">PN</span><span class="plain"> = </span><span class="identifier">Tables::cells_in_ith_column</span><span class="plain">(</span><span class="identifier">t</span><span class="plain">, 0);</span>
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<span class="reserved">while</span><span class="plain"> ((</span><span class="identifier">PN</span><span class="plain"> != </span><span class="identifier">NULL</span><span class="plain">) && (</span><span class="identifier">PN</span><span class="plain">-</span><span class="element">>next</span><span class="plain"> != </span><span class="identifier">NULL</span><span class="plain">)) </span><span class="identifier">PN</span><span class="plain"> = </span><span class="identifier">PN</span><span class="plain">-</span><span class="element">>next</span><span class="plain">;</span>
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<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">PN</span><span class="plain"> != </span><span class="identifier">NULL</span><span class="plain">) && (</span><span class="identifier">max_score_VAR</span><span class="plain">) &&</span>
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<span class="plain">(</span><span class="identifier">NonlocalVariables::has_initial_value_set</span><span class="plain">(</span><span class="identifier">max_score_VAR</span><span class="plain">) == </span><span class="identifier">FALSE</span><span class="plain">))</span>
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<span class="identifier">Assertions::PropertyKnowledge::initialise_global_variable</span><span class="plain">(</span>
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<span class="identifier">max_score_VAR</span><span class="plain">, </span><span class="identifier">ParseTree::get_evaluation</span><span class="plain">(</span><span class="identifier">PN</span><span class="plain">));</span>
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<span class="reserved">break</span><span class="plain">;</span>
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<span class="plain">}</span>
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<span class="plain">}</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">NonlocalVariables::has_initial_value_set</span><span class="plain">(</span><span class="identifier">max_score_VAR</span><span class="plain">)) {</span>
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<span class="identifier">inter_t</span><span class="plain"> </span><span class="identifier">v1</span><span class="plain"> = 0, </span><span class="identifier">v2</span><span class="plain"> = 0;</span>
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<span class="identifier">NonlocalVariables::seek_initial_value</span><span class="plain">(&</span><span class="identifier">v1</span><span class="plain">, &</span><span class="identifier">v2</span><span class="plain">, </span><span class="identifier">max_score_VAR</span><span class="plain">);</span>
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<span class="identifier">Emit::named_generic_constant</span><span class="plain">(</span><span class="identifier">InterNames::iname</span><span class="plain">(</span><span class="identifier">INITIAL_MAX_SCORE_INAME</span><span class="plain">), </span><span class="identifier">v1</span><span class="plain">, </span><span class="identifier">v2</span><span class="plain">);</span>
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<span class="plain">} </span><span class="reserved">else</span><span class="plain"> {</span>
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<span class="identifier">Emit::named_numeric_constant</span><span class="plain">(</span><span class="identifier">InterNames::iname</span><span class="plain">(</span><span class="identifier">INITIAL_MAX_SCORE_INAME</span><span class="plain">), 0);</span>
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<span class="plain">}</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function PL::Score::compile_max_score appears nowhere else.</p>
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<hr class="tocbar">
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<ul class="toc"><li><a href="3-tm2.html">Back to 'Temporal Map'</a></li><li><i>(This section ends Chapter 3: Space and Time.)</i></li></ul><hr class="tocbar">
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<!--End of weave: 62 lines from a web of 25574-->
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