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      <h1 class="title">std/lexbase</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="#7" id="57">Types</a></summary>
    <ul class="simple simple-toc-section">
      <li><a class="reference" href="#BaseLexer" title="BaseLexer = object of RootObj
  bufpos*: int               ## the current position within the buffer
  buf*: string               ## the buffer itself
  ## the input stream
  lineNumber*: int           ## the current line number
  offsetBase*: int">BaseLexer</a></li>

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    <summary><a class="reference reference-toplevel" href="#10" id="60">Consts</a></summary>
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      <li><a class="reference" href="#EndOfFile" title="EndOfFile = '\x00'">EndOfFile</a></li>
<li><a class="reference" href="#NewLines" title="NewLines = {'\r', '\n'}">NewLines</a></li>

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    <summary><a class="reference reference-toplevel" href="#12" id="62">Procs</a></summary>
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      <ul class="simple nested-toc-section">close
  <li><a class="reference" href="#close%2CBaseLexer" title="close(L: var BaseLexer)">close(L: var BaseLexer)</a></li>

</ul>
<ul class="simple nested-toc-section">getColNumber
  <li><a class="reference" href="#getColNumber%2CBaseLexer%2Cint" title="getColNumber(L: BaseLexer; pos: int): int">getColNumber(L: BaseLexer; pos: int): int</a></li>

</ul>
<ul class="simple nested-toc-section">getCurrentLine
  <li><a class="reference" href="#getCurrentLine%2CBaseLexer%2Cbool" title="getCurrentLine(L: BaseLexer; marker: bool = true): string">getCurrentLine(L: BaseLexer; marker: bool = true): string</a></li>

</ul>
<ul class="simple nested-toc-section">handleCR
  <li><a class="reference" href="#handleCR%2CBaseLexer%2Cint" title="handleCR(L: var BaseLexer; pos: int): int">handleCR(L: var BaseLexer; pos: int): int</a></li>

</ul>
<ul class="simple nested-toc-section">handleLF
  <li><a class="reference" href="#handleLF%2CBaseLexer%2Cint" title="handleLF(L: var BaseLexer; pos: int): int">handleLF(L: var BaseLexer; pos: int): int</a></li>

</ul>
<ul class="simple nested-toc-section">handleRefillChar
  <li><a class="reference" href="#handleRefillChar%2CBaseLexer%2Cint" title="handleRefillChar(L: var BaseLexer; pos: int): int">handleRefillChar(L: var BaseLexer; pos: int): int</a></li>

</ul>
<ul class="simple nested-toc-section">open
  <li><a class="reference" href="#open%2CBaseLexer%2CStream%2Cint%2Cset%5Bchar%5D" title="open(L: var BaseLexer; input: Stream; bufLen: int = 8192;
     refillChars: set[char] = NewLines)">open(L: var BaseLexer; input: Stream; bufLen: int = 8192;
     refillChars: set[char] = NewLines)</a></li>

</ul>

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

    <div id="tocRoot"></div>
    
    <p class="module-desc">This module implements a base object of a lexer with efficient buffer handling. Only at line endings checks are necessary if the buffer needs refilling.</p>
    <div class="section" id="6">
  <h1><a class="toc-backref" href="#6">Imports</a></h1>
  <dl class="item">
    <a class="reference external" href="strutils.html">strutils</a>, <a class="reference external" href="streams.html">streams</a>, <a class="reference external" href="assertions.html">assertions</a>
  </dl>
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<div class="section" id="7">
  <h1><a class="toc-backref" href="#7">Types</a></h1>
  <dl class="item">
    <div id="BaseLexer">
  <dt><pre><a href="lexbase.html#BaseLexer"><span class="Identifier">BaseLexer</span></a> <span class="Other">=</span> <span class="Keyword">object</span> <span class="Keyword">of</span> <a href="system.html#RootObj"><span class="Identifier">RootObj</span></a>
  <span class="Identifier">bufpos</span><span class="Operator">*</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a>               <span class="Comment">## the current position within the buffer</span>
  <span class="Identifier">buf</span><span class="Operator">*</span><span class="Other">:</span> <a href="system.html#string"><span class="Identifier">string</span></a>               <span class="Comment">## the buffer itself</span>
  <span class="Comment">## the input stream</span>
  <span class="Identifier">lineNumber</span><span class="Operator">*</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a>           <span class="Comment">## the current line number</span>
  <span class="Identifier">offsetBase</span><span class="Operator">*</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a></pre></dt>
  <dd>
    
    the base lexer. Inherit your lexer from this object.
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/lexbase.nim#L31" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/lexbase.nim#L31" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

  </dd>
</div>

  </dl>
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<div class="section" id="10">
  <h1><a class="toc-backref" href="#10">Consts</a></h1>
  <dl class="item">
    <div id="EndOfFile">
  <dt><pre><a href="lexbase.html#EndOfFile"><span class="Identifier">EndOfFile</span></a> <span class="Other">=</span> <span class="CharLit">'\x00'</span></pre></dt>
  <dd>
    
    end of file marker
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/lexbase.nim#L21" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/lexbase.nim#L21" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

  </dd>
</div>
<div id="NewLines">
  <dt><pre><a href="lexbase.html#NewLines"><span class="Identifier">NewLines</span></a> <span class="Other">=</span> <span class="Other">{</span><span class="CharLit">'\r'</span><span class="Other">,</span> <span class="CharLit">'\n'</span><span class="Other">}</span></pre></dt>
  <dd>
    
    
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/lexbase.nim#L22" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/lexbase.nim#L22" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

  </dd>
</div>

  </dl>
</div>
<div class="section" id="12">
  <h1><a class="toc-backref" href="#12">Procs</a></h1>
  <dl class="item">
    <div id="close-procs-all">
  <div id="close,BaseLexer">
  <dt><pre><span class="Keyword">proc</span> <a href="#close%2CBaseLexer"><span class="Identifier">close</span></a><span class="Other">(</span><span class="Identifier">L</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="lexbase.html#BaseLexer"><span class="Identifier">BaseLexer</span></a><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="Identifier">IOError</span><span class="Other">,</span> <span class="Identifier">OSError</span><span class="Other">]</span><span class="Other">,</span>
                               <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">WriteIOEffect</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>
    
    closes the base lexer. This closes <tt class="docutils literal"><span class="pre"><span class="Identifier">L</span></span></tt>'s associated stream too.
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/lexbase.nim#L42" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/lexbase.nim#L42" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

  </dd>
</div>

</div>
<div id="getColNumber-procs-all">
  <div id="getColNumber,BaseLexer,int">
  <dt><pre><span class="Keyword">proc</span> <a href="#getColNumber%2CBaseLexer%2Cint"><span class="Identifier">getColNumber</span></a><span class="Other">(</span><span class="Identifier">L</span><span class="Other">:</span> <a href="lexbase.html#BaseLexer"><span class="Identifier">BaseLexer</span></a><span class="Other">;</span> <span class="Identifier">pos</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a><span class="Other">)</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a> {.<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>
    
    retrieves the current column.
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/lexbase.nim#L153" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/lexbase.nim#L153" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

  </dd>
</div>

</div>
<div id="getCurrentLine-procs-all">
  <div id="getCurrentLine,BaseLexer,bool">
  <dt><pre><span class="Keyword">proc</span> <a href="#getCurrentLine%2CBaseLexer%2Cbool"><span class="Identifier">getCurrentLine</span></a><span class="Other">(</span><span class="Identifier">L</span><span class="Other">:</span> <a href="lexbase.html#BaseLexer"><span class="Identifier">BaseLexer</span></a><span class="Other">;</span> <span class="Identifier">marker</span><span class="Other">:</span> <a href="system.html#bool"><span class="Identifier">bool</span></a> <span class="Other">=</span> <span class="Identifier">true</span><span class="Other">)</span><span class="Other">:</span> <a href="system.html#string"><span class="Identifier">string</span></a> {.<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>
    
    retrieves the current line.
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/lexbase.nim#L157" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/lexbase.nim#L157" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

  </dd>
</div>

</div>
<div id="handleCR-procs-all">
  <div id="handleCR,BaseLexer,int">
  <dt><pre><span class="Keyword">proc</span> <a href="#handleCR%2CBaseLexer%2Cint"><span class="Identifier">handleCR</span></a><span class="Other">(</span><span class="Identifier">L</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="lexbase.html#BaseLexer"><span class="Identifier">BaseLexer</span></a><span class="Other">;</span> <span class="Identifier">pos</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a><span class="Other">)</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a> {.<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="Identifier">IOError</span><span class="Other">,</span> <span class="Identifier">OSError</span><span class="Other">]</span><span class="Other">,</span>
    <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">ReadIOEffect</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>
    
    Call this if you scanned over <tt class="docutils literal"><span class="pre"><span class="CharLit">'\c'</span></span></tt> in the buffer; it returns the position to continue the scanning from. <tt class="docutils literal"><span class="pre"><span class="Identifier">pos</span></span></tt> must be the position of the <tt class="docutils literal"><span class="pre"><span class="CharLit">'\c'</span></span></tt>.
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/lexbase.nim#L106" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/lexbase.nim#L106" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

  </dd>
</div>

</div>
<div id="handleLF-procs-all">
  <div id="handleLF,BaseLexer,int">
  <dt><pre><span class="Keyword">proc</span> <a href="#handleLF%2CBaseLexer%2Cint"><span class="Identifier">handleLF</span></a><span class="Other">(</span><span class="Identifier">L</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="lexbase.html#BaseLexer"><span class="Identifier">BaseLexer</span></a><span class="Other">;</span> <span class="Identifier">pos</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a><span class="Other">)</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a> {.<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="Identifier">IOError</span><span class="Other">,</span> <span class="Identifier">OSError</span><span class="Other">]</span><span class="Other">,</span>
    <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">ReadIOEffect</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>
    
    Call this if you scanned over <tt class="docutils literal"><span class="pre"><span class="CharLit">'\L'</span></span></tt> in the buffer; it returns the position to continue the scanning from. <tt class="docutils literal"><span class="pre"><span class="Identifier">pos</span></span></tt> must be the position of the <tt class="docutils literal"><span class="pre"><span class="CharLit">'\L'</span></span></tt>.
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/lexbase.nim#L117" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/lexbase.nim#L117" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

  </dd>
</div>

</div>
<div id="handleRefillChar-procs-all">
  <div id="handleRefillChar,BaseLexer,int">
  <dt><pre><span class="Keyword">proc</span> <a href="#handleRefillChar%2CBaseLexer%2Cint"><span class="Identifier">handleRefillChar</span></a><span class="Other">(</span><span class="Identifier">L</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="lexbase.html#BaseLexer"><span class="Identifier">BaseLexer</span></a><span class="Other">;</span> <span class="Identifier">pos</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a><span class="Other">)</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a> {.
    <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="Identifier">IOError</span><span class="Other">,</span> <span class="Identifier">OSError</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">ReadIOEffect</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>
    
    Call this if a terminator character other than a new line is scanned at <tt class="docutils literal"><span class="pre"><span class="Identifier">pos</span></span></tt>; it returns the position to continue the scanning from.
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/lexbase.nim#L126" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/lexbase.nim#L126" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

  </dd>
</div>

</div>
<div id="open-procs-all">
  <div id="open,BaseLexer,Stream,int,set[char]">
  <dt><pre><span class="Keyword">proc</span> <a href="#open%2CBaseLexer%2CStream%2Cint%2Cset%5Bchar%5D"><span class="Identifier">open</span></a><span class="Other">(</span><span class="Identifier">L</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="lexbase.html#BaseLexer"><span class="Identifier">BaseLexer</span></a><span class="Other">;</span> <span class="Identifier">input</span><span class="Other">:</span> <a href="streams.html#Stream"><span class="Identifier">Stream</span></a><span class="Other">;</span> <span class="Identifier">bufLen</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a> <span class="Other">=</span> <span class="DecNumber">8192</span><span class="Other">;</span>
          <span class="Identifier">refillChars</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">NewLines</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="Identifier">IOError</span><span class="Other">,</span> <span class="Identifier">OSError</span><span class="Other">]</span><span class="Other">,</span>
    <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">ReadIOEffect</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>
    
    inits the BaseLexer with a stream to read from.
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/lexbase.nim#L137" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/lexbase.nim#L137" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

  </dd>
</div>

</div>

  </dl>
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