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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="#17" id="67">Macros</a></summary> | ||
<ul class="simple simple-toc-section"> | ||
<ul class="simple nested-toc-section">tap | ||
<li><a class="reference" href="#tap.m%2Cvarargs%5Buntyped%5D" title="tap(nodes: varargs[untyped]): untyped">tap(nodes: varargs[untyped]): untyped</a></li> | ||
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<a href="https://github.com/metagn/assigns/tree/master/src/assigns/tap.nim#L1" class="link-seesrc" target="_blank">Source</a> | ||
<a href="https://github.com/metagn/assigns/edit/master/src/assigns/tap.nim#L1" class="link-seesrc" target="_blank" >Edit</a> | ||
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<a class="reference external" href="impl.html">impl</a> | ||
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<h1><a class="toc-backref" href="#17">Macros</a></h1> | ||
<dl class="item"> | ||
<div id="tap-macros-all"> | ||
<div id="tap.m,varargs[untyped]"> | ||
<dt><pre><span class="Keyword">macro</span> <a href="#tap.m%2Cvarargs%5Buntyped%5D"><span class="Identifier">tap</span></a><span class="Other">(</span><span class="Identifier">nodes</span><span class="Other">:</span> <span class="Identifier">varargs</span><span class="Other">[</span><span class="Identifier">untyped</span><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">untyped</span></pre></dt> | ||
<dd> | ||
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<p>Processes a series of "assignment" expressions, applying them in reverse to the given body. <tt class="docutils literal"><span class="pre"><span class="Keyword">else</span></span></tt>/<tt class="docutils literal"><span class="pre"><span class="Keyword">elif</span></span></tt> and <tt class="docutils literal"><span class="pre"><span class="Keyword">except</span></span></tt>/<tt class="docutils literal"><span class="pre"><span class="Keyword">finally</span></span></tt> can also be given, where <tt class="docutils literal"><span class="pre"><span class="Keyword">else</span></span></tt>/<tt class="docutils literal"><span class="pre"><span class="Keyword">elif</span></span></tt> triggers if any "matching" assignments fail, and <tt class="docutils literal"><span class="pre"><span class="Keyword">except</span></span></tt>/<tt class="docutils literal"><span class="pre"><span class="Keyword">finally</span></span></tt> have the usual behavior.</p> | ||
<p>An assignment expression can be one of:</p> | ||
<ul class="simple"><li>a normal assignment, of the form <tt class="docutils literal"><span class="pre"><span class="Identifier">a</span> <span class="Punctuation">:</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 class="Operator">=</span> <span class="Identifier">b</span></span></tt>; prepended to the body verbatim</li> | ||
<li>a matching assignment, of the form <tt class="docutils literal"><span class="pre"><span class="Identifier">a</span> <span class="Punctuation">:</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 class="Operator">=?</span> <span class="Identifier">b</span></span></tt>; prepends an assignment <tt class="docutils literal"><span class="pre"><span class="Identifier">a</span> <span class="Punctuation">:</span><span class="Operator">=</span> <span class="Identifier">b</span></span></tt> and stops execution or jumps to <tt class="docutils literal"><span class="pre"><span class="Keyword">else</span></span></tt> block if the assignment fails</li> | ||
<li>result assignment, of the form <tt class="docutils literal"><span class="pre"><span class="Identifier">result</span> <span class="Identifier">a</span></span></tt> or <tt class="docutils literal"><span class="pre"><span class="Identifier">result</span> <span class="Identifier">a</span> <span class="Punctuation">:</span><span class="Operator">=</span> <span class="Identifier">b</span></span></tt>; returns <tt class="docutils literal"><span class="pre"><span class="Identifier">a</span></span></tt> as the value of the expression</li> | ||
<li>an iterator assignment, of the form <tt class="docutils literal"><span class="pre"><span class="Identifier">a</span> <span class="Keyword">in</span> <span class="Identifier">b</span></span></tt>; wraps the body in <tt class="docutils literal"><span class="pre"><span class="Keyword">for</span> <span class="Identifier">a</span> <span class="Keyword">in</span> <span class="Identifier">b</span><span class="Punctuation">:</span> <span class="Operator">...</span></span></tt> , allowing complex assignments for <tt class="docutils literal"><span class="pre"><span class="Identifier">a</span></span></tt></li> | ||
<li>a filter, of the form <tt class="docutils literal"><span class="pre"><span class="Identifier">filter</span> <span class="Identifier">cond</span></span></tt>; wraps the body in <tt class="docutils literal"><span class="pre"><span class="Keyword">if</span> <span class="Identifier">cond</span><span class="Punctuation">:</span> <span class="Operator">...</span></span></tt> statement</li> | ||
<li>a list of other assignment expressions, as in <tt class="docutils literal"><span class="pre"><span class="Identifier">tap</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="Punctuation">;</span> <span class="Operator">...</span> <span class="Keyword">do</span><span class="Punctuation">:</span> <span class="Operator">...</span></span></tt>; applies assignments in reverse order</li> | ||
<li>any other statement; also prepended to the block verbatim</li> | ||
</ul> | ||
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<p><strong class="examples_text">Example:</strong></p> | ||
<pre class="listing"><span class="Keyword">import</span> <span class="Identifier">assigns</span> | ||
<span class="Keyword">let</span> <span class="Identifier">val</span> <span class="Operator">=</span> <span class="Identifier">tap</span><span class="Punctuation">(</span><span class="Identifier">a</span> <span class="Punctuation">:</span><span class="Operator">=</span> <span class="DecNumber">5</span><span class="Punctuation">)</span><span class="Punctuation">:</span> <span class="Identifier">a</span> <span class="Operator">+</span> <span class="DecNumber">1</span> | ||
<span class="Keyword">var</span> <span class="Identifier">s</span><span class="Punctuation">:</span> <span class="Identifier">seq</span><span class="Punctuation">[</span><span class="Identifier">int</span><span class="Punctuation">]</span> | ||
<span class="Identifier">tap</span> <span class="Identifier">a</span> <span class="Punctuation">:</span><span class="Operator">=</span> <span class="DecNumber">5</span><span class="Punctuation">,</span> <span class="Identifier">i</span> <span class="Keyword">in</span> <span class="DecNumber">1</span> <span class="Operator">..</span> <span class="Identifier">a</span><span class="Punctuation">,</span> <span class="Identifier">filter</span> <span class="Identifier">i</span> <span class="Keyword">mod</span> <span class="DecNumber">2</span> <span class="Operator">!=</span> <span class="DecNumber">0</span><span class="Punctuation">:</span> | ||
<span class="Identifier">s</span><span class="Operator">.</span><span class="Identifier">add</span><span class="Punctuation">(</span><span class="Identifier">i</span><span class="Punctuation">)</span> | ||
<span class="Identifier">doAssert</span> <span class="Identifier">s</span> <span class="Operator">==</span> <span class="Operator">@</span><span class="Punctuation">[</span><span class="DecNumber">1</span><span class="Punctuation">,</span> <span class="DecNumber">3</span><span class="Punctuation">,</span> <span class="DecNumber">5</span><span class="Punctuation">]</span> | ||
<span class="Identifier">doAssert</span> <span class="Identifier">val</span> <span class="Operator">==</span> <span class="DecNumber">6</span> | ||
<span class="Keyword">let</span> <span class="Identifier">x</span> <span class="Operator">=</span> <span class="Identifier">tap</span><span class="Punctuation">(</span><span class="Identifier">a</span> <span class="Punctuation">:</span><span class="Operator">=</span> <span class="DecNumber">5</span><span class="Punctuation">,</span> <span class="Identifier">result</span> <span class="Identifier">s</span> <span class="Punctuation">:</span><span class="Operator">=</span> <span class="Identifier">newSeq</span><span class="Punctuation">[</span><span class="Identifier">int</span><span class="Punctuation">]</span><span class="Punctuation">(</span><span class="Identifier">a</span><span class="Punctuation">)</span><span class="Punctuation">,</span> <span class="Identifier">i</span> <span class="Keyword">in</span> <span class="DecNumber">0</span> <span class="Operator">..<</span> <span class="Identifier">a</span><span class="Punctuation">)</span><span class="Punctuation">:</span> | ||
<span class="Identifier">s</span><span class="Punctuation">[</span><span class="Identifier">i</span><span class="Punctuation">]</span> <span class="Operator">=</span> <span class="Identifier">i</span> <span class="Operator">+</span> <span class="DecNumber">1</span> | ||
<span class="Identifier">doAssert</span> <span class="Identifier">x</span> <span class="Operator">==</span> <span class="Operator">@</span><span class="Punctuation">[</span><span class="DecNumber">1</span><span class="Punctuation">,</span> <span class="DecNumber">2</span><span class="Punctuation">,</span> <span class="DecNumber">3</span><span class="Punctuation">,</span> <span class="DecNumber">4</span><span class="Punctuation">,</span> <span class="DecNumber">5</span><span class="Punctuation">]</span> | ||
<span class="Keyword">var</span> <span class="Identifier">s2</span><span class="Punctuation">:</span> <span class="Identifier">seq</span><span class="Punctuation">[</span><span class="Identifier">int</span><span class="Punctuation">]</span> | ||
<span class="Identifier">tap</span><span class="Punctuation">:</span> | ||
<span class="Identifier">a</span> <span class="Operator">=</span> <span class="DecNumber">5</span> | ||
<span class="Identifier">i</span> <span class="Keyword">in</span> <span class="DecNumber">1</span> <span class="Operator">..</span> <span class="Identifier">a</span> | ||
<span class="Identifier">filter</span> <span class="Identifier">i</span> <span class="Keyword">mod</span> <span class="DecNumber">2</span> <span class="Operator">!=</span> <span class="DecNumber">0</span> | ||
<span class="Keyword">do</span><span class="Punctuation">:</span> | ||
<span class="Identifier">s2</span><span class="Operator">.</span><span class="Identifier">add</span><span class="Punctuation">(</span><span class="Identifier">i</span><span class="Punctuation">)</span> | ||
<span class="Identifier">doAssert</span> <span class="Identifier">s2</span> <span class="Operator">==</span> <span class="Operator">@</span><span class="Punctuation">[</span><span class="DecNumber">1</span><span class="Punctuation">,</span> <span class="DecNumber">3</span><span class="Punctuation">,</span> <span class="DecNumber">5</span><span class="Punctuation">]</span></pre> | ||
<a href="https://github.com/metagn/assigns/tree/master/src/assigns/tap.nim#L235" class="link-seesrc" target="_blank">Source</a> | ||
<a href="https://github.com/metagn/assigns/edit/master/src/assigns/tap.nim#L235" class="link-seesrc" target="_blank" >Edit</a> | ||
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