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      <h1 class="title">std/genasts</h1>
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  <a class="reference reference-toplevel" href="#6" id="56">Imports</a>
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    <summary><a class="reference reference-toplevel" href="#7" id="57">Types</a></summary>
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      <li><a class="reference" href="#GenAstOpt" title="GenAstOpt = enum
  kDirtyTemplate, kNoNewLit">GenAstOpt</a></li>

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      <ul class="simple nested-toc-section">genAstOpt
  <li><a class="reference" href="#genAstOpt.m%2Cstaticset%5BGenAstOpt%5D%2Cvarargs%5Buntyped%5D" title="genAstOpt(options: static set[GenAstOpt]; args: varargs[untyped]): untyped">genAstOpt(options: static set[GenAstOpt]; args: varargs[untyped]): untyped</a></li>

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      <ul class="simple nested-toc-section">genAst
  <li><a class="reference" href="#genAst.t%2Cvarargs%5Buntyped%5D" title="genAst(args: varargs[untyped]): untyped">genAst(args: varargs[untyped]): untyped</a></li>

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    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/genasts.nim#L1" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
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    <div id="tocRoot"></div>
    
    <p class="module-desc">This module implements AST generation using captured variables for macros.</p>
    <div class="section" id="6">
  <h1><a class="toc-backref" href="#6">Imports</a></h1>
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    <a class="reference external" href="macros.html">macros</a>
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<div class="section" id="7">
  <h1><a class="toc-backref" href="#7">Types</a></h1>
  <dl class="item">
    <div id="GenAstOpt">
  <dt><pre><a href="genasts.html#GenAstOpt"><span class="Identifier">GenAstOpt</span></a> <span class="Other">=</span> <span class="Keyword">enum</span>
  <span class="Identifier">kDirtyTemplate</span><span class="Other">,</span> <span class="Identifier">kNoNewLit</span></pre></dt>
  <dd>
    
    
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/genasts.nim#L5" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/genasts.nim#L5" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

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<div class="section" id="17">
  <h1><a class="toc-backref" href="#17">Macros</a></h1>
  <dl class="item">
    <div id="genAstOpt-macros-all">
  <div id="genAstOpt.m,staticset[GenAstOpt],varargs[untyped]">
  <dt><pre><span class="Keyword">macro</span> <a href="#genAstOpt.m%2Cstaticset%5BGenAstOpt%5D%2Cvarargs%5Buntyped%5D"><span class="Identifier">genAstOpt</span></a><span class="Other">(</span><span class="Identifier">options</span><span class="Other">:</span> <a href="system.html#static"><span class="Identifier">static</span></a> <a href="system.html#set"><span class="Identifier">set</span></a><span class="Other">[</span><a href="genasts.html#GenAstOpt"><span class="Identifier">GenAstOpt</span></a><span class="Other">]</span><span class="Other">;</span> <span class="Identifier">args</span><span class="Other">:</span> <a href="system.html#varargs"><span class="Identifier">varargs</span></a><span class="Other">[</span><a href="system.html#untyped"><span class="Identifier">untyped</span></a><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <a href="system.html#untyped"><span class="Identifier">untyped</span></a></pre></dt>
  <dd>
    
    Accepts a list of captured variables <tt class="docutils literal"><span class="pre"><span class="Identifier">a</span><span class="Operator">=</span><span class="Identifier">b</span></span></tt> or <tt class="docutils literal"><span class="pre"><span class="Identifier">a</span></span></tt> and a block and returns the AST that represents it. Local <tt class="docutils literal"><span class="pre"><span class="Punctuation">{</span><span class="Operator">.</span><span class="Identifier">inject</span><span class="Operator">.</span><span class="Punctuation">}</span></span></tt> symbols (e.g. procs) are captured unless <tt class="docutils literal"><span class="pre"><span class="Identifier">kDirtyTemplate</span> <span class="Keyword">in</span> <span class="Identifier">options</span></span></tt>.
<p><strong class="examples_text">Example:</strong></p>
<pre class="listing"><span class="Comment"># This example shows how one could write a simplified version of `unittest.check`.</span>
<span class="Keyword">import</span> <span class="Identifier">std</span><span class="Operator">/</span><span class="Punctuation">[</span><span class="Identifier">macros</span><span class="Punctuation">,</span> <span class="Identifier">strutils</span><span class="Punctuation">]</span>
<span class="Keyword">macro</span> <span class="Identifier">check2</span><span class="Punctuation">(</span><span class="Identifier">cond</span><span class="Punctuation">:</span> <span class="Identifier">bool</span><span class="Punctuation">)</span><span class="Punctuation">:</span> <span class="Identifier">untyped</span> <span class="Operator">=</span>
  <span class="Identifier">assert</span> <span class="Identifier">cond</span><span class="Operator">.</span><span class="Identifier">kind</span> <span class="Operator">==</span> <span class="Identifier">nnkInfix</span><span class="Punctuation">,</span> <span class="StringLit">&quot;$# not implemented&quot;</span> <span class="Operator">%</span> <span class="Operator">$</span><span class="Identifier">cond</span><span class="Operator">.</span><span class="Identifier">kind</span>
  <span class="Identifier">result</span> <span class="Operator">=</span> <span class="Identifier">genAst</span><span class="Punctuation">(</span><span class="Identifier">cond</span><span class="Punctuation">,</span> <span class="Identifier">s</span> <span class="Operator">=</span> <span class="Identifier">repr</span><span class="Punctuation">(</span><span class="Identifier">cond</span><span class="Punctuation">)</span><span class="Punctuation">,</span> <span class="Identifier">lhs</span> <span class="Operator">=</span> <span class="Identifier">cond</span><span class="Punctuation">[</span><span class="DecNumber">1</span><span class="Punctuation">]</span><span class="Punctuation">,</span> <span class="Identifier">rhs</span> <span class="Operator">=</span> <span class="Identifier">cond</span><span class="Punctuation">[</span><span class="DecNumber">2</span><span class="Punctuation">]</span><span class="Punctuation">)</span><span class="Punctuation">:</span>
    <span class="Comment"># each local symbol we access must be explicitly captured</span>
    <span class="Keyword">if</span> <span class="Keyword">not</span> <span class="Identifier">cond</span><span class="Punctuation">:</span>
      <span class="Identifier">raiseAssert</span> <span class="StringLit">&quot;'$#'' failed: lhs: '$#', rhs: '$#'&quot;</span> <span class="Operator">%</span> <span class="Punctuation">[</span><span class="Identifier">s</span><span class="Punctuation">,</span> <span class="Operator">$</span><span class="Identifier">lhs</span><span class="Punctuation">,</span> <span class="Operator">$</span><span class="Identifier">rhs</span><span class="Punctuation">]</span>
<span class="Keyword">let</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="DecNumber">3</span>
<span class="Identifier">check2</span> <span class="Identifier">a</span><span class="Operator">*</span><span class="DecNumber">2</span> <span class="Operator">==</span> <span class="Identifier">a</span><span class="Operator">+</span><span class="DecNumber">3</span>
<span class="Keyword">if</span> <span class="Identifier">false</span><span class="Punctuation">:</span> <span class="Identifier">check2</span> <span class="Identifier">a</span><span class="Operator">*</span><span class="DecNumber">2</span> <span class="Operator">&lt;</span> <span class="Identifier">a</span><span class="Operator">+</span><span class="DecNumber">1</span> <span class="Comment"># would error with: 'a * 2 &lt; a + 1'' failed: lhs: '6', rhs: '4'</span></pre>
<p><strong class="examples_text">Example:</strong></p>
<pre class="listing"><span class="Comment"># This example goes in more details about the capture semantics.</span>
<span class="Keyword">macro</span> <span class="Identifier">fun</span><span class="Punctuation">(</span><span class="Identifier">a</span><span class="Punctuation">:</span> <span class="Identifier">string</span><span class="Punctuation">,</span> <span class="Identifier">b</span><span class="Punctuation">:</span> <span class="Keyword">static</span> <span class="Identifier">bool</span><span class="Punctuation">)</span><span class="Punctuation">:</span> <span class="Identifier">untyped</span> <span class="Operator">=</span>
  <span class="Keyword">let</span> <span class="Identifier">c</span> <span class="Operator">=</span> <span class="CharLit">'z'</span>
  <span class="Keyword">var</span> <span class="Identifier">d</span> <span class="Operator">=</span> <span class="DecNumber">11</span> <span class="Comment"># implicitly {.gensym.} and needs to be captured for use in `genAst`.</span>
  <span class="Keyword">proc</span> <span class="Identifier">localFun</span><span class="Punctuation">(</span><span class="Punctuation">)</span><span class="Punctuation">:</span> <span class="Identifier">auto</span> <span class="Operator">=</span> <span class="DecNumber">12</span> <span class="Comment"># implicitly {.inject.}, doesn't need to be captured.</span>
  <span class="Identifier">genAst</span><span class="Punctuation">(</span><span class="Identifier">a</span><span class="Punctuation">,</span> <span class="Identifier">b</span><span class="Punctuation">,</span> <span class="Identifier">c</span> <span class="Operator">=</span> <span class="Identifier">true</span><span class="Punctuation">)</span><span class="Punctuation">:</span>
    <span class="Comment"># `a`, `b` are captured explicitly, `c` is a local definition masking `c = 'z'`.</span>
    <span class="Keyword">const</span> <span class="Identifier">b2</span> <span class="Operator">=</span> <span class="Identifier">b</span> <span class="Comment"># macro static param `b` is forwarded here as a static param.</span>
    <span class="Comment"># `echo d` would give: `var not init` because `d` is not captured.</span>
    <span class="Punctuation">(</span><span class="Identifier">a</span> <span class="Operator">&amp;</span> <span class="Identifier">a</span><span class="Punctuation">,</span> <span class="Identifier">b</span><span class="Punctuation">,</span> <span class="Identifier">c</span><span class="Punctuation">,</span> <span class="Identifier">localFun</span><span class="Punctuation">(</span><span class="Punctuation">)</span><span class="Punctuation">)</span> <span class="Comment"># localFun can be called without capture.</span>
<span class="Identifier">assert</span> <span class="Identifier">fun</span><span class="Punctuation">(</span><span class="StringLit">&quot;ab&quot;</span><span class="Punctuation">,</span> <span class="Identifier">false</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="Punctuation">(</span><span class="StringLit">&quot;abab&quot;</span><span class="Punctuation">,</span> <span class="Identifier">false</span><span class="Punctuation">,</span> <span class="Identifier">true</span><span class="Punctuation">,</span> <span class="DecNumber">12</span><span class="Punctuation">)</span></pre>
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/genasts.nim#L15" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/genasts.nim#L15" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

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<div class="section" id="18">
  <h1><a class="toc-backref" href="#18">Templates</a></h1>
  <dl class="item">
    <div id="genAst-templates-all">
  <div id="genAst.t,varargs[untyped]">
  <dt><pre><span class="Keyword">template</span> <a href="#genAst.t%2Cvarargs%5Buntyped%5D"><span class="Identifier">genAst</span></a><span class="Other">(</span><span class="Identifier">args</span><span class="Other">:</span> <a href="system.html#varargs"><span class="Identifier">varargs</span></a><span class="Other">[</span><a href="system.html#untyped"><span class="Identifier">untyped</span></a><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <a href="system.html#untyped"><span class="Identifier">untyped</span></a></pre></dt>
  <dd>
    
    Convenience wrapper around <tt class="docutils literal"><span class="pre"><span class="Identifier">genAstOpt</span></span></tt>.
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/genasts.nim#L87" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/genasts.nim#L87" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

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