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<title>Tracing Joy Execution — Thun 0.4.1 documentation</title>
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<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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<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 +] trace
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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 left, then a
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bullet symbol, •, to represent the current locus of processing, then
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the pending expression to the right.</p>
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<dl class="py class">
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<dt class="sig sig-object py" id="joy.utils.pretty_print.TracePrinter">
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<em class="property"><span class="pre">class</span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">joy.utils.pretty_print.</span></span><span class="sig-name descname"><span class="pre">TracePrinter</span></span><a class="reference internal" href="_modules/joy/utils/pretty_print.html#TracePrinter"><span class="viewcode-link"><span class="pre">[source]</span></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="py method">
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<dt class="sig sig-object py" id="joy.utils.pretty_print.TracePrinter.go">
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<span class="sig-name descname"><span class="pre">go</span></span><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"><span class="pre">[source]</span></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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<dl class="field-list simple">
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<dt class="field-odd">Return type</dt>
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<dd class="field-odd"><p>list(str)</p>
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</dd>
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</dl>
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</dd></dl>
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<dl class="py method">
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<dt class="sig sig-object py" id="joy.utils.pretty_print.TracePrinter.viewer">
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<span class="sig-name descname"><span class="pre">viewer</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">stack</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">expression</span></span></em><span class="sig-paren">)</span><a class="reference internal" href="_modules/joy/utils/pretty_print.html#TracePrinter.viewer"><span class="viewcode-link"><span class="pre">[source]</span></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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<dl class="field-list simple">
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<dt class="field-odd">Parameters</dt>
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<dd class="field-odd"><ul class="simple">
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<li><p><strong>quote</strong> (<em>stack</em>) – A stack.</p></li>
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<li><p><strong>expression</strong> (<em>stack</em>) – A stack.</p></li>
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</ul>
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</dd>
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</dl>
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</dd></dl>
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</dd></dl>
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<dl class="py function">
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<dt class="sig sig-object py" id="joy.utils.pretty_print.trace">
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<span class="sig-prename descclassname"><span class="pre">joy.utils.pretty_print.</span></span><span class="sig-name descname"><span class="pre">trace</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">stack</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">expression</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">dictionary</span></span></em><span class="sig-paren">)</span><a class="reference internal" href="_modules/joy/utils/pretty_print.html#trace"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#joy.utils.pretty_print.trace" title="Permalink to this definition">¶</a></dt>
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<dd><p>Evaluate a Joy expression on a stack and print a trace.</p>
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<p>This function is just like the <cite>i</cite> combinator but it also prints a
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trace of the evaluation</p>
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<dl class="field-list simple">
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<dt class="field-odd">Parameters</dt>
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<dd class="field-odd"><ul class="simple">
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<li><p><strong>stack</strong> (<em>stack</em>) – The stack.</p></li>
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<li><p><strong>expression</strong> (<em>stack</em>) – The expression to evaluate.</p></li>
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<li><p><strong>dictionary</strong> (<em>dict</em>) – A <code class="docutils literal notranslate"><span class="pre">dict</span></code> mapping names to Joy functions.</p></li>
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</ul>
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</dd>
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<dt class="field-even">Return type</dt>
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<dd class="field-even"><p>(stack, (), dictionary)</p>
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</dd>
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</dl>
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</dd></dl>
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</section>
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<h3>Navigation</h3>
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<li class="toctree-l1"><a class="reference internal" href="notebooks/Intro.html">Thun: Joy in Python</a></li>
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<li class="toctree-l1"><a class="reference internal" href="joy.html">Joy Interpreter</a></li>
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<li class="toctree-l1 current"><a class="current reference internal" href="#">Tracing Joy Execution</a><ul>
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<li class="toctree-l2"><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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<li class="toctree-l1"><a class="reference internal" href="types.html">Type Inference of Joy Expressions</a></li>
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<li class="toctree-l1"><a class="reference internal" href="notebooks/index.html">Essays about Programming in Joy</a></li>
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<h3>Related Topics</h3>
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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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<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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