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      <h1 class="title">std/strbasics</h1>
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  <li>
  <a class="reference reference-toplevel" href="#6" id="56">Imports</a>
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  <details open>
    <summary><a class="reference reference-toplevel" href="#12" id="62">Procs</a></summary>
    <ul class="simple simple-toc-section">
      <ul class="simple nested-toc-section">add
  <li><a class="reference" href="#add%2Cstring%2CopenArray%5Bchar%5D" title="add(x: var string; y: openArray[char])">add(x: var string; y: openArray[char])</a></li>

</ul>
<ul class="simple nested-toc-section">setSlice
  <li><a class="reference" href="#setSlice%2Cstring%2CSlice%5Bint%5D" title="setSlice(s: var string; slice: Slice[int])">setSlice(s: var string; slice: Slice[int])</a></li>

</ul>
<ul class="simple nested-toc-section">strip
  <li><a class="reference" href="#strip%2Cstring%2Cset%5Bchar%5D" title="strip(a: var string; leading = true; trailing = true;
      chars: set[char] = whitespaces)">strip(a: var string; leading = true; trailing = true;
      chars: set[char] = whitespaces)</a></li>

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  <div class="nine columns" id="content">
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/strbasics.nim#L1" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/strbasics.nim#L1" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

    <div id="tocRoot"></div>
    
    <p class="module-desc"><p>This module provides some high performance string operations.</p>
<p>Experimental API, subject to change.</p>
</p>
    <div class="section" id="6">
  <h1><a class="toc-backref" href="#6">Imports</a></h1>
  <dl class="item">
    <a class="reference external" href="assertions.html">assertions</a>
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<div class="section" id="12">
  <h1><a class="toc-backref" href="#12">Procs</a></h1>
  <dl class="item">
    <div id="add-procs-all">
  <div id="add,string,openArray[char]">
  <dt><pre><span class="Keyword">proc</span> <a href="#add%2Cstring%2CopenArray%5Bchar%5D"><span class="Identifier">add</span></a><span class="Other">(</span><span class="Identifier">x</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="system.html#string"><span class="Identifier">string</span></a><span class="Other">;</span> <span class="Identifier">y</span><span class="Other">:</span> <a href="system.html#openArray"><span class="Identifier">openArray</span></a><span class="Other">[</span><a href="system.html#char"><span class="Identifier">char</span></a><span class="Other">]</span><span class="Other">)</span> {.<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
  <dd>
    
    Concatenates <tt class="docutils literal"><span class="pre"><span class="Identifier">x</span></span></tt> and <tt class="docutils literal"><span class="pre"><span class="Identifier">y</span></span></tt> in place. <tt class="docutils literal"><span class="pre"><span class="Identifier">y</span></span></tt> must not overlap with <tt class="docutils literal"><span class="pre"><span class="Identifier">x</span></span></tt> to allow future <tt class="docutils literal"><span class="pre"><span class="Identifier">memcpy</span></span></tt> optimizations.
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/strbasics.nim#L20" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/strbasics.nim#L20" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

  </dd>
</div>

</div>
<div id="setSlice-procs-all">
  <div id="setSlice,string,Slice[int]">
  <dt><pre><span class="Keyword">func</span> <a href="#setSlice%2Cstring%2CSlice%5Bint%5D"><span class="Identifier">setSlice</span></a><span class="Other">(</span><span class="Identifier">s</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="system.html#string"><span class="Identifier">string</span></a><span class="Other">;</span> <span class="Identifier">slice</span><span class="Other">:</span> <a href="system.html#Slice"><span class="Identifier">Slice</span></a><span class="Other">[</span><a href="system.html#int"><span class="Identifier">int</span></a><span class="Other">]</span><span class="Other">)</span> {.<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span>
    <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
  <dd>
    
    Inplace version of <tt class="docutils literal"><span class="pre"><span class="Identifier">substr</span></span></tt>.
<p><strong class="examples_text">Example:</strong></p>
<pre class="listing"><span class="Keyword">import</span> <span class="Identifier">std</span><span class="Operator">/</span><span class="Identifier">sugar</span>

<span class="Keyword">var</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="StringLit">&quot;Hello, Nim!&quot;</span>
<span class="Identifier">doAssert</span> <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">dup</span><span class="Punctuation">(</span><span class="Identifier">setSlice</span><span class="Punctuation">(</span><span class="DecNumber">7</span> <span class="Operator">..</span> <span class="DecNumber">9</span><span class="Punctuation">)</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="StringLit">&quot;Nim&quot;</span>
<span class="Identifier">doAssert</span> <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">dup</span><span class="Punctuation">(</span><span class="Identifier">setSlice</span><span class="Punctuation">(</span><span class="DecNumber">0</span> <span class="Operator">..</span> <span class="DecNumber">0</span><span class="Punctuation">)</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="StringLit">&quot;H&quot;</span>
<span class="Identifier">doAssert</span> <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">dup</span><span class="Punctuation">(</span><span class="Identifier">setSlice</span><span class="Punctuation">(</span><span class="DecNumber">0</span> <span class="Operator">..</span> <span class="DecNumber">1</span><span class="Punctuation">)</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="StringLit">&quot;He&quot;</span>
<span class="Identifier">doAssert</span> <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">dup</span><span class="Punctuation">(</span><span class="Identifier">setSlice</span><span class="Punctuation">(</span><span class="DecNumber">0</span> <span class="Operator">..</span> <span class="DecNumber">10</span><span class="Punctuation">)</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="Identifier">a</span>
<span class="Identifier">doAssert</span> <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">dup</span><span class="Punctuation">(</span><span class="Identifier">setSlice</span><span class="Punctuation">(</span><span class="DecNumber">1</span> <span class="Operator">..</span> <span class="DecNumber">0</span><span class="Punctuation">)</span><span class="Punctuation">)</span><span class="Operator">.</span><span class="Identifier">len</span> <span class="Operator">==</span> <span class="DecNumber">0</span>
<span class="Identifier">doAssert</span> <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">dup</span><span class="Punctuation">(</span><span class="Identifier">setSlice</span><span class="Punctuation">(</span><span class="DecNumber">20</span> <span class="Operator">..</span> <span class="Operator">-</span><span class="DecNumber">1</span><span class="Punctuation">)</span><span class="Punctuation">)</span><span class="Operator">.</span><span class="Identifier">len</span> <span class="Operator">==</span> <span class="DecNumber">0</span>


<span class="Identifier">doAssertRaises</span><span class="Punctuation">(</span><span class="Identifier">AssertionDefect</span><span class="Punctuation">)</span><span class="Punctuation">:</span>
  <span class="Keyword">discard</span> <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">dup</span><span class="Punctuation">(</span><span class="Identifier">setSlice</span><span class="Punctuation">(</span><span class="Operator">-</span><span class="DecNumber">1</span> <span class="Operator">..</span> <span class="DecNumber">1</span><span class="Punctuation">)</span><span class="Punctuation">)</span>

<span class="Identifier">doAssertRaises</span><span class="Punctuation">(</span><span class="Identifier">AssertionDefect</span><span class="Punctuation">)</span><span class="Punctuation">:</span>
  <span class="Keyword">discard</span> <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">dup</span><span class="Punctuation">(</span><span class="Identifier">setSlice</span><span class="Punctuation">(</span><span class="DecNumber">1</span> <span class="Operator">..</span> <span class="DecNumber">11</span><span class="Punctuation">)</span><span class="Punctuation">)</span></pre>
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/strbasics.nim#L47" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/strbasics.nim#L47" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

  </dd>
</div>

</div>
<div id="strip-procs-all">
  <div id="strip,string,set[char]">
  <dt><pre><span class="Keyword">func</span> <a href="#strip%2Cstring%2Cset%5Bchar%5D"><span class="Identifier">strip</span></a><span class="Other">(</span><span class="Identifier">a</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="system.html#string"><span class="Identifier">string</span></a><span class="Other">;</span> <span class="Identifier">leading</span> <span class="Other">=</span> <span class="Identifier">true</span><span class="Other">;</span> <span class="Identifier">trailing</span> <span class="Other">=</span> <span class="Identifier">true</span><span class="Other">;</span>
           <span class="Identifier">chars</span><span class="Other">:</span> <a href="system.html#set"><span class="Identifier">set</span></a><span class="Other">[</span><a href="system.html#char"><span class="Identifier">char</span></a><span class="Other">]</span> <span class="Other">=</span> <span class="Identifier">whitespaces</span><span class="Other">)</span> {.<span class="Identifier">inline</span><span class="Other">,</span> <span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span>
    <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
  <dd>
    
    <p>Inplace version of <tt class="docutils literal"><span class="pre"><span class="Identifier">strip</span></span></tt>. Strips leading or trailing <tt class="docutils literal"><span class="pre"><span class="Identifier">chars</span></span></tt> (default: whitespace characters).</p>
<p>If <tt class="docutils literal"><span class="pre"><span class="Identifier">leading</span></span></tt> is true (default), leading <tt class="docutils literal"><span class="pre"><span class="Identifier">chars</span></span></tt> are stripped. If <tt class="docutils literal"><span class="pre"><span class="Identifier">trailing</span></span></tt> is true (default), trailing <tt class="docutils literal"><span class="pre"><span class="Identifier">chars</span></span></tt> are stripped. If both are false, the string is unchanged.</p>

<p><strong class="examples_text">Example:</strong></p>
<pre class="listing"><span class="Keyword">var</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="StringLit">&quot;  vhellov   &quot;</span>
<span class="Identifier">strip</span><span class="Punctuation">(</span><span class="Identifier">a</span><span class="Punctuation">)</span>
<span class="Identifier">assert</span> <span class="Identifier">a</span> <span class="Operator">==</span> <span class="StringLit">&quot;vhellov&quot;</span>

<span class="Identifier">a</span> <span class="Operator">=</span> <span class="StringLit">&quot;  vhellov   &quot;</span>
<span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">strip</span><span class="Punctuation">(</span><span class="Identifier">leading</span> <span class="Operator">=</span> <span class="Identifier">false</span><span class="Punctuation">)</span>
<span class="Identifier">assert</span> <span class="Identifier">a</span> <span class="Operator">==</span> <span class="StringLit">&quot;  vhellov&quot;</span>

<span class="Identifier">a</span> <span class="Operator">=</span> <span class="StringLit">&quot;  vhellov   &quot;</span>
<span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">strip</span><span class="Punctuation">(</span><span class="Identifier">trailing</span> <span class="Operator">=</span> <span class="Identifier">false</span><span class="Punctuation">)</span>
<span class="Identifier">assert</span> <span class="Identifier">a</span> <span class="Operator">==</span> <span class="StringLit">&quot;vhellov   &quot;</span>

<span class="Keyword">var</span> <span class="Identifier">c</span> <span class="Operator">=</span> <span class="StringLit">&quot;blaXbla&quot;</span>
<span class="Identifier">c</span><span class="Operator">.</span><span class="Identifier">strip</span><span class="Punctuation">(</span><span class="Identifier">chars</span> <span class="Operator">=</span> <span class="Punctuation">{</span><span class="Punctuation">'</span><span class="Identifier">b</span><span class="CharLit">', '</span><span class="Identifier">a</span><span class="CharLit">'})</span>
<span class="Identifier">assert</span> <span class="Identifier">c</span> <span class="Operator">==</span> <span class="StringLit">&quot;laXbl&quot;</span>
<span class="Identifier">c</span> <span class="Operator">=</span> <span class="StringLit">&quot;blaXbla&quot;</span>
<span class="Identifier">c</span><span class="Operator">.</span><span class="Identifier">strip</span><span class="Punctuation">(</span><span class="Identifier">chars</span> <span class="Operator">=</span> <span class="Punctuation">{</span><span class="Punctuation">'</span><span class="Identifier">b</span><span class="CharLit">', '</span><span class="Identifier">a</span><span class="CharLit">', '</span><span class="Identifier">l</span><span class="CharLit">'})</span>
<span class="Identifier">assert</span> <span class="Identifier">c</span> <span class="Operator">==</span> <span class="StringLit">&quot;X&quot;</span></pre>
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/strbasics.nim#L92" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/strbasics.nim#L92" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

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