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<h1>Penlight</h1>
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<li><a href="#Functions">Functions</a></li>
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<h2>Libraries</h2>
<ul class="$(kind=='Topics' and '' or 'nowrap'">
<li><a href="../libraries/pl.html">pl</a></li>
<li><a href="../libraries/pl.Set.html">pl.Set</a></li>
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<li><a href="../libraries/pl.input.html">pl.input</a></li>
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<li><strong>pl.lexer</strong></li>
<li><a href="../libraries/pl.luabalanced.html">pl.luabalanced</a></li>
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<h2>Manual</h2>
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<li><a href="../manual/01-introduction.md.html">Introduction</a></li>
<li><a href="../manual/02-arrays.md.html">Tables and Arrays</a></li>
<li><a href="../manual/03-strings.md.html">Strings. Higher-level operations on strings.</a></li>
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<li><a href="../manual/06-data.md.html">Data</a></li>
<li><a href="../manual/07-functional.md.html">Functional Programming</a></li>
<li><a href="../manual/08-additional.md.html">Additional Libraries</a></li>
<li><a href="../manual/09-discussion.md.html">Technical Choices</a></li>
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<h2>Examples</h2>
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<li><a href="../examples/seesubst.lua.html">seesubst.lua</a></li>
<li><a href="../examples/sipscan.lua.html">sipscan.lua</a></li>
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<h1>Module <code>pl.lexer</code></h1>
<p>Lexical scanner for creating a sequence of tokens from text.</p>
<p> <code>lexer.scan(s)</code> returns an iterator over all tokens found in the
string <code>s</code>. This iterator returns two values, a token type string
(such as 'string' for quoted string, 'iden' for identifier) and the value of the
token.</p>
<p> Versions specialized for Lua and C are available; these also handle block comments
and classify keywords as 'keyword' tokens. For example:</p>
<pre>
> s = <span class="string">'for i=1,n do'</span>
> <span class="keyword">for</span> t,v <span class="keyword">in</span> lexer.lua(s) <span class="keyword">do</span> <span class="global">print</span>(t,v) <span class="keyword">end</span>
keyword <span class="keyword">for</span>
iden i
= =
number <span class="number">1</span>
, ,
iden n
keyword <span class="keyword">do</span>
</pre>
<p> See the Guide for further <a href="../manual/06-data.md.html#Lexical_Scanning">discussion</a></p>
<h2><a href="#Functions">Functions</a></h2>
<table class="function_list">
<tr>
<td class="name" nowrap><a href="#scan">scan (s, matches[, filter[, options]])</a></td>
<td class="summary">create a plain token iterator from a string or file-like object.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#insert">insert (tok, a1, a2)</a></td>
<td class="summary">insert tokens into a stream.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#getline">getline (tok)</a></td>
<td class="summary">get everything in a stream upto a newline.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#lineno">lineno (tok)</a></td>
<td class="summary">get current line number.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#getrest">getrest (tok)</a></td>
<td class="summary">get the rest of the stream.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#get_keywords">get_keywords ()</a></td>
<td class="summary">get the Lua keywords as a set-like table.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#lua">lua (s[, filter[, options]])</a></td>
<td class="summary">create a Lua token iterator from a string or file-like object.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#cpp">cpp (s[, filter[, options]])</a></td>
<td class="summary">create a C/C++ token iterator from a string or file-like object.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#get_separated_list">get_separated_list (tok[, endtoken=')'[, delim=']])</a></td>
<td class="summary">get a list of parameters separated by a delimiter from a stream.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#skipws">skipws (tok)</a></td>
<td class="summary">get the next non-space token from the stream.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#expecting">expecting (tok, expected_type, no_skip_ws)</a></td>
<td class="summary">get the next token, which must be of the expected type.</td>
</tr>
</table>
<br/>
<br/>
<h2><a name="Functions"></a>Functions</h2>
<dl class="function">
<dt>
<a name = "scan"></a>
<strong>scan (s, matches[, filter[, options]])</strong>
</dt>
<dd>
create a plain token iterator from a string or file-like object.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">s</span>
<span class="types"><a class="type" href="http://www.lua.org/manual/5.2/manual.html#6.4">string</a></span>
the string
</li>
<li><span class="parameter">matches</span>
<span class="types"><span class="type">tab</span></span>
an optional match table (set of pattern-action pairs)
</li>
<li><span class="parameter">filter</span>
<span class="types"><span class="type">tab</span></span>
a table of token types to exclude, by default <code>{space=true}</code>
(<em>optional</em>)
</li>
<li><span class="parameter">options</span>
<span class="types"><span class="type">tab</span></span>
a table of options; by default, <code>{number=true,string=true}</code>,
which means convert numbers and strip string quotes.
(<em>optional</em>)
</li>
</ul>
</dd>
<dt>
<a name = "insert"></a>
<strong>insert (tok, a1, a2)</strong>
</dt>
<dd>
insert tokens into a stream.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">tok</span>
a token stream
</li>
<li><span class="parameter">a1</span>
a string is the type, a table is a token list and
a function is assumed to be a token-like iterator (returns type & value)
</li>
<li><span class="parameter">a2</span>
<span class="types"><a class="type" href="http://www.lua.org/manual/5.2/manual.html#6.4">string</a></span>
a string is the value
</li>
</ul>
</dd>
<dt>
<a name = "getline"></a>
<strong>getline (tok)</strong>
</dt>
<dd>
get everything in a stream upto a newline.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">tok</span>
a token stream
</li>
</ul>
<h3>Returns:</h3>
<ol>
a string
</ol>
</dd>
<dt>
<a name = "lineno"></a>
<strong>lineno (tok)</strong>
</dt>
<dd>
get current line number.
Only available if the input source is a file-like object.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">tok</span>
a token stream
</li>
</ul>
<h3>Returns:</h3>
<ol>
the line number and current column
</ol>
</dd>
<dt>
<a name = "getrest"></a>
<strong>getrest (tok)</strong>
</dt>
<dd>
get the rest of the stream.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">tok</span>
a token stream
</li>
</ul>
<h3>Returns:</h3>
<ol>
a string
</ol>
</dd>
<dt>
<a name = "get_keywords"></a>
<strong>get_keywords ()</strong>
</dt>
<dd>
get the Lua keywords as a set-like table.
So <code>res["and"]</code> etc would be <code>true</code>.
<h3>Returns:</h3>
<ol>
a table
</ol>
</dd>
<dt>
<a name = "lua"></a>
<strong>lua (s[, filter[, options]])</strong>
</dt>
<dd>
create a Lua token iterator from a string or file-like object.
Will return the token type and value.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">s</span>
<span class="types"><a class="type" href="http://www.lua.org/manual/5.2/manual.html#6.4">string</a></span>
the string
</li>
<li><span class="parameter">filter</span>
<span class="types"><span class="type">tab</span></span>
a table of token types to exclude, by default <code>{space=true,comments=true}</code>
(<em>optional</em>)
</li>
<li><span class="parameter">options</span>
<span class="types"><span class="type">tab</span></span>
a table of options; by default, <code>{number=true,string=true}</code>,
which means convert numbers and strip string quotes.
(<em>optional</em>)
</li>
</ul>
</dd>
<dt>
<a name = "cpp"></a>
<strong>cpp (s[, filter[, options]])</strong>
</dt>
<dd>
create a C/C++ token iterator from a string or file-like object.
Will return the token type type and value.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">s</span>
<span class="types"><a class="type" href="http://www.lua.org/manual/5.2/manual.html#6.4">string</a></span>
the string
</li>
<li><span class="parameter">filter</span>
<span class="types"><span class="type">tab</span></span>
a table of token types to exclude, by default <code>{space=true,comments=true}</code>
(<em>optional</em>)
</li>
<li><span class="parameter">options</span>
<span class="types"><span class="type">tab</span></span>
a table of options; by default, <code>{number=true,string=true}</code>,
which means convert numbers and strip string quotes.
(<em>optional</em>)
</li>
</ul>
</dd>
<dt>
<a name = "get_separated_list"></a>
<strong>get_separated_list (tok[, endtoken=')'[, delim=']])</strong>
</dt>
<dd>
get a list of parameters separated by a delimiter from a stream.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">tok</span>
the token stream
</li>
<li><span class="parameter">endtoken</span>
<span class="types"><a class="type" href="http://www.lua.org/manual/5.2/manual.html#6.4">string</a></span>
end of list. Can be '\n'
(<em>default</em> ')')
</li>
<li><span class="parameter">delim</span>
<span class="types"><a class="type" href="http://www.lua.org/manual/5.2/manual.html#6.4">string</a></span>
separator
(<em>default</em> ')
</li>
</ul>
<h3>Returns:</h3>
<ol>
a list of token lists.
</ol>
</dd>
<dt>
<a name = "skipws"></a>
<strong>skipws (tok)</strong>
</dt>
<dd>
get the next non-space token from the stream.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">tok</span>
the token stream.
</li>
</ul>
</dd>
<dt>
<a name = "expecting"></a>
<strong>expecting (tok, expected_type, no_skip_ws)</strong>
</dt>
<dd>
get the next token, which must be of the expected type.
Throws an error if this type does not match!
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">tok</span>
the token stream
</li>
<li><span class="parameter">expected_type</span>
<span class="types"><a class="type" href="http://www.lua.org/manual/5.2/manual.html#6.4">string</a></span>
the token type
</li>
<li><span class="parameter">no_skip_ws</span>
<span class="types"><span class="type">bool</span></span>
whether we should skip whitespace
</li>
</ul>
</dd>
</dl>
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