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<div class="section" id="tracing-joy-execution">
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<h1>Tracing Joy Execution<a class="headerlink" href="#tracing-joy-execution" title="Permalink to this headline">¶</a></h1>
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<div class="section" id="module-joy.utils.pretty_print">
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<span id="joy-utils-pretty-print"></span><h2><code class="docutils literal notranslate"><span class="pre">joy.utils.pretty_print</span></code><a class="headerlink" href="#module-joy.utils.pretty_print" title="Permalink to this headline">¶</a></h2>
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<p>Pretty printing support, e.g.:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>Joy? 23 18 * 99 +
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. 23 18 mul 99 add
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23 . 18 mul 99 add
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23 18 . mul 99 add
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414 . 99 add
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414 99 . add
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513 .
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513 <-top
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joy?
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</pre></div>
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</div>
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<p>On each line the stack is printed with the top to the right, then a <code class="docutils literal notranslate"><span class="pre">.</span></code> to
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represent the current locus of processing, then the pending expression to the
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left.</p>
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<dl class="class">
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<dt id="joy.utils.pretty_print.TracePrinter">
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<em class="property">class </em><code class="descclassname">joy.utils.pretty_print.</code><code class="descname">TracePrinter</code><a class="reference internal" href="_modules/joy/utils/pretty_print.html#TracePrinter"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#joy.utils.pretty_print.TracePrinter" title="Permalink to this definition">¶</a></dt>
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<dd><p>This is what does the formatting. You instantiate it and pass the <code class="docutils literal notranslate"><span class="pre">viewer()</span></code>
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method to the <a class="reference internal" href="joy.html#joy.joy.joy" title="joy.joy.joy"><code class="xref py py-func docutils literal notranslate"><span class="pre">joy.joy.joy()</span></code></a> function, then print it to see the
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trace.</p>
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<dl class="method">
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<dt id="joy.utils.pretty_print.TracePrinter.go">
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<code class="descname">go</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/joy/utils/pretty_print.html#TracePrinter.go"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#joy.utils.pretty_print.TracePrinter.go" title="Permalink to this definition">¶</a></dt>
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<dd><p>Return a list of strings, one for each entry in the history, prefixed
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with enough spaces to align all the interpreter dots.</p>
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<p>This method is called internally by the <code class="docutils literal notranslate"><span class="pre">__str__()</span></code> method.</p>
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<table class="docutils field-list" frame="void" rules="none">
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<col class="field-name" />
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<col class="field-body" />
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<tbody valign="top">
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<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">list(str)</td>
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</tr>
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</tbody>
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</table>
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</dd></dl>
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<dl class="method">
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<dt id="joy.utils.pretty_print.TracePrinter.viewer">
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<code class="descname">viewer</code><span class="sig-paren">(</span><em>stack</em>, <em>expression</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/joy/utils/pretty_print.html#TracePrinter.viewer"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#joy.utils.pretty_print.TracePrinter.viewer" title="Permalink to this definition">¶</a></dt>
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<dd><p>Record the current stack and expression in the TracePrinter’s history.
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Pass this method as the <code class="docutils literal notranslate"><span class="pre">viewer</span></code> argument to the <a class="reference internal" href="joy.html#joy.joy.joy" title="joy.joy.joy"><code class="xref py py-func docutils literal notranslate"><span class="pre">joy.joy.joy()</span></code></a> function.</p>
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<col class="field-name" />
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<col class="field-body" />
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<tbody valign="top">
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<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
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<li><strong>quote</strong> (<em>stack</em>) – A stack.</li>
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<li><strong>expression</strong> (<em>stack</em>) – A stack.</li>
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</ul>
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</td>
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</tr>
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<h3><a href="index.html">Table Of Contents</a></h3>
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<ul>
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<li><a class="reference internal" href="#">Tracing Joy Execution</a><ul>
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<li><a class="reference internal" href="#module-joy.utils.pretty_print"><code class="docutils literal notranslate"><span class="pre">joy.utils.pretty_print</span></code></a></li>
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<h3>Related Topics</h3>
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<ul>
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<li><a href="index.html">Documentation overview</a><ul>
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<li>Previous: <a href="parser.html" title="previous chapter">Parsing Text into Joy Expressions</a></li>
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<li>Next: <a href="library.html" title="next chapter">Function Reference</a></li>
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<span xmlns:dct="http://purl.org/dc/terms/" property="dct:title">Thun Documentation</span> by <a xmlns:cc="http://creativecommons.org/ns#" href="https://joypy.osdn.io/" property="cc:attributionName" rel="cc:attributionURL">Simon Forman</a> is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/">Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License</a>.<br />Based on a work at <a xmlns:dct="http://purl.org/dc/terms/" href="https://osdn.net/projects/joypy/" rel="dct:source">https://osdn.net/projects/joypy/</a>.
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