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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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<h1>Module <code>pl.template</code></h1>
<p>A template preprocessor.</p>
<p> Originally by <a href="http://lua-users.org/wiki/SlightlyLessSimpleLuaPreprocessor">Ricki Lake</a></p>
<p> There are two rules:</p>
<ul>
<li>lines starting with # are Lua</li>
<li>otherwise, <code>$(expr)</code> is the result of evaluating <code>expr</code></li>
</ul>
<p> Example:</p>
<pre>
# <span class="keyword">for</span> i = <span class="number">1</span>,<span class="number">3</span> <span class="keyword">do</span>
$(i) Hello, Word!
# <span class="keyword">end</span>
===>
<span class="number">1</span> Hello, Word!
<span class="number">2</span> Hello, Word!
<span class="number">3</span> Hello, Word!
</pre>
<p> Other escape characters can be used, when the defaults conflict
with the output language.</p>
<pre>
> <span class="keyword">for</span> _,n <span class="keyword">in</span> <span class="global">pairs</span>{<span class="string">'one'</span>,<span class="string">'two'</span>,<span class="string">'three'</span>} <span class="keyword">do</span>
static int l_${n} (luaState *state);
> <span class="keyword">end</span>
</pre>
<p> See <a href="../manual/03-strings.md.html#Another_Style_of_Template">the Guide</a>.</p>
<p> Dependencies: <a href="../libraries/pl.utils.html#">pl.utils</a></p>
<h2><a href="#Functions">Functions</a></h2>
<table class="function_list">
<tr>
<td class="name" nowrap><a href="#substitute">substitute (str[, env])</a></td>
<td class="summary">expand the template using the specified environment.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#ct:render">ct:render ([env[, parent[, db]]])</a></td>
<td class="summary">executes the previously compiled template and renders it.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#compile">compile (str[, opts])</a></td>
<td class="summary">compiles the template.</td>
</tr>
</table>
<br/>
<br/>
<h2 class="section-header "><a name="Functions"></a>Functions</h2>
<dl class="function">
<dt>
<a name = "substitute"></a>
<strong>substitute (str[, env])</strong>
</dt>
<dd>
<p>expand the template using the specified environment.
This function will compile and render the template. For more performant
recurring usage use the two step approach by using <a href="../libraries/pl.template.html#compile">compile</a> and <a href="../libraries/pl.template.html#ct:render">ct:render</a>.
There are six special fields in the environment table <code>env</code></p>
<ul>
<li><code>_parent</code>: continue looking up in this table (e.g. <code>_parent=_G</code>).</li>
<li><code>_brackets</code>: bracket pair that wraps inline Lua expressions, default is '()'.</li>
<li><code>_escape</code>: character marking Lua lines, default is '#'</li>
<li><code>_inline_escape</code>: character marking inline Lua expression, default is '$'.</li>
<li><code>_chunk_name</code>: chunk name for loaded templates, used if there
is an error in Lua code. Default is 'TMP'.</li>
<li><code>_debug</code>: if truthy, the generated code will be printed upon a render error</li>
</ul>
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">str</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.1/manual.html#5.4">string</a></span>
the template string
</li>
<li><span class="parameter">env</span>
<span class="types"><span class="type">tab</span></span>
the environment
(<em>optional</em>)
</li>
</ul>
<h3>Returns:</h3>
<ol>
<code>rendered template + nil + source_code</code>, or <code>nil + error + source_code</code>. The last
return value (<code>source_code</code>) is only returned if the debug option is used.
</ol>
</dd>
<dt>
<a name = "ct:render"></a>
<strong>ct:render ([env[, parent[, db]]])</strong>
</dt>
<dd>
executes the previously compiled template and renders it.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">env</span>
<span class="types"><span class="type">tab</span></span>
the environment.
(<em>optional</em>)
</li>
<li><span class="parameter">parent</span>
<span class="types"><span class="type">tab</span></span>
continue looking up in this table (e.g. <code>parent=_G</code>).
(<em>optional</em>)
</li>
<li><span class="parameter">db</span>
<span class="types"><span class="type">bool</span></span>
if thruthy, it will print the code upon a render error
(provided the template was compiled with the debug option).
(<em>optional</em>)
</li>
</ul>
<h3>Returns:</h3>
<ol>
<code>rendered template + nil + source_code</code>, or <code>nil + error + source_code</code>. The last return value
(<code>source_code</code>) is only returned if the template was compiled with the debug option.
</ol>
<h3>Usage:</h3>
<ul>
<pre class="example"><span class="keyword">local</span> ct, err = template.compile(my_template)
<span class="keyword">local</span> rendered , err = ct:render(my_env, parent)</pre>
</ul>
</dd>
<dt>
<a name = "compile"></a>
<strong>compile (str[, opts])</strong>
</dt>
<dd>
<p>compiles the template.
Returns an object that can repeatedly be rendered without parsing/compiling
the template again.
The options passed in the <code>opts</code> table support the following options:</p>
<ul>
<li><code>chunk_name</code>: chunk name for loaded templates, used if there
is an error in Lua code. Default is 'TMP'.</li>
<li><code>escape</code>: character marking Lua lines, default is '#'</li>
<li><code>inline_escape</code>: character marking inline Lua expression, default is '$'.</li>
<li><code>inline_brackets</code>: bracket pair that wraps inline Lua expressions, default is '()'.</li>
<li><code>newline</code>: string to replace newline characters, default is <code>nil</code> (not replacing newlines).</li>
<li><a href="https://www.lua.org/manual/5.1/manual.html#5.9">debug</a>: if truthy, the generated source code will be retained within the compiled template object, default is <code>nil</code>.</li>
</ul>
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">str</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.1/manual.html#5.4">string</a></span>
the template string
</li>
<li><span class="parameter">opts</span>
<span class="types"><span class="type">tab</span></span>
the compilation options to use
(<em>optional</em>)
</li>
</ul>
<h3>Returns:</h3>
<ol>
template object, or <code>nil + error + source_code</code>
</ol>
<h3>Usage:</h3>
<ul>
<pre class="example"><span class="keyword">local</span> ct, err = template.compile(my_template)
<span class="keyword">local</span> rendered , err = ct:render(my_env, parent)</pre>
</ul>
</dd>
</dl>
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