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<main role="main">
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<!--Weave of 'Build Scripts' generated by Inweb-->
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<div class="breadcrumbs">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inbuild Modules</a></li><li><a href="index.html">supervisor</a></li><li><a href="index.html#3">Chapter 3: Incremental Builds</a></li><li><b>Build Scripts</b></li></ul></div>
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<p class="purpose">Scripts are nothing more than lists of build steps.</p>
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<ul class="toc"><li><a href="3-bs.html#SP1">§1. Build scripts</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. Build scripts. </b>Suppose the incremental build algorithm has decided it wants to build node
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<span class="extract"><span class="extract-syntax">V</span></span> in the graph: it does so by calling <span class="extract"><span class="extract-syntax">BuildScripts::execute</span></span> on the script
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attached to <span class="extract"><span class="extract-syntax">V</span></span>. This is only a list of steps:
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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">build_script</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">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">steps</span><span class="plain-syntax">; </span><span class="comment-syntax"> of </span><span class="extract"><span class="extract-syntax">build_step</span></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">build_script</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">build_script</span><span class="plain-syntax"> *</span><span class="function-syntax">BuildScripts::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">BuildScripts::new</span></span>:<br/>Build Graphs - <a href="3-bg.html#SP2">§2</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="reserved-syntax">build_script</span><span class="plain-syntax"> *</span><span class="identifier-syntax">BS</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">build_script</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">BS</span><span class="plain-syntax">-></span><span class="element-syntax">steps</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="reserved-syntax">build_step</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">BS</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">BuildScripts::add_step</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">BuildScripts::add_step</span></span>:<br/>Build Steps - <a href="3-bs2.html#SP4">§4</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">build_script</span><span class="plain-syntax"> *</span><span class="identifier-syntax">BS</span><span class="plain-syntax">, </span><span class="reserved-syntax">build_step</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">ADD_TO_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="reserved-syntax">build_step</span><span class="plain-syntax">, </span><span class="identifier-syntax">BS</span><span class="plain-syntax">-></span><span class="element-syntax">steps</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">BuildScripts::script_length</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">BuildScripts::script_length</span></span>:<br/>Build Graphs - <a href="3-bg.html#SP5">§5</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">build_script</span><span class="plain-syntax"> *</span><span class="identifier-syntax">BS</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">BS</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="constant-syntax">0</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">LinkedLists::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">BS</span><span class="plain-syntax">-></span><span class="element-syntax">steps</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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<ul class="endnotetexts"><li>The structure build_script 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>We execute the steps in sequence, of course. As soon as any step fails,
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returning <span class="extract"><span class="extract-syntax">FALSE</span></span>, the script halts and returns <span class="extract"><span class="extract-syntax">FALSE</span></span>. An empty script
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always succeeds and returns <span class="extract"><span class="extract-syntax">TRUE</span></span>.
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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="function-syntax">BuildScripts::execute</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">BuildScripts::execute</span></span>:<br/>Incremental Building - <a href="3-ib.html#SP7_1_3">§7.1.3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">build_vertex</span><span class="plain-syntax"> *</span><span class="identifier-syntax">V</span><span class="plain-syntax">, </span><span class="reserved-syntax">build_script</span><span class="plain-syntax"> *</span><span class="identifier-syntax">BS</span><span class="plain-syntax">, </span><span class="reserved-syntax">build_methodology</span><span class="plain-syntax"> *</span><span class="identifier-syntax">BM</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">search_list</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">rv</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="reserved-syntax">build_step</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="reserved-syntax">build_step</span><span class="plain-syntax">, </span><span class="identifier-syntax">BS</span><span class="plain-syntax">-></span><span class="element-syntax">steps</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">rv</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">rv</span><span class="plain-syntax"> = </span><a href="3-bs2.html#SP5" class="function-link"><span class="function-syntax">BuildSteps::execute</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">V</span><span class="plain-syntax">, </span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">BM</span><span class="plain-syntax">, </span><span class="identifier-syntax">search_list</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">rv</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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