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<h1>
<small class="visible-xs">EEx v1.7.2</small>
EEx
<a href="https://github.com/elixir-lang/elixir/blob/v1.7.2/lib/eex/lib/eex.ex#L10" title="View Source" class="view-source" rel="help">
<span class="icon-code" aria-hidden="true"></span>
<span class="sr-only">View Source</span>
</a>
</h1>
<section id="moduledoc">
<p>EEx stands for Embedded Elixir. It allows you to embed
Elixir code inside a string in a robust way.</p>
<pre><code class="nohighlight makeup elixir"><span class="gp unselectable">iex> </span><span class="nc">EEx</span><span class="o">.</span><span class="n">eval_string</span><span class="p" data-group-id="0226061792-1">(</span><span class="s">"foo <%= bar %>"</span><span class="p">,</span><span class="w"> </span><span class="ss">bar</span><span class="p">:</span><span class="w"> </span><span class="s">"baz"</span><span class="p" data-group-id="0226061792-1">)</span><span class="w">
</span><span class="s">"foo baz"</span></code></pre>
<h2 id="module-api" class="section-heading">
<a href="#module-api" class="hover-link"><span class="icon-link" aria-hidden="true"></span></a>
API
</h2>
<p>This module provides 3 main APIs for you to use:</p>
<ol>
<li><p>Evaluate a string (<code class="inline">eval_string</code>) or a file (<code class="inline">eval_file</code>)
directly. This is the simplest API to use but also the
slowest, since the code is evaluated and not compiled before.</p>
</li>
<li><p>Define a function from a string (<code class="inline">function_from_string</code>)
or a file (<code class="inline">function_from_file</code>). This allows you to embed
the template as a function inside a module which will then
be compiled. This is the preferred API if you have access
to the template at compilation time.</p>
</li>
<li><p>Compile a string (<code class="inline">compile_string</code>) or a file (<code class="inline">compile_file</code>)
into Elixir syntax tree. This is the API used by both functions
above and is available to you if you want to provide your own
ways of handling the compiled template.</p>
</li>
</ol>
<h2 id="module-options" class="section-heading">
<a href="#module-options" class="hover-link"><span class="icon-link" aria-hidden="true"></span></a>
Options
</h2>
<p>All functions in this module accept EEx-related options.
They are:</p>
<ul>
<li><code class="inline">:line</code> - the line to be used as the template start. Defaults to 1.
</li>
<li><code class="inline">:file</code> - the file to be used in the template. Defaults to the given
file the template is read from or to “nofile” when compiling from a string.
</li>
<li><code class="inline">:engine</code> - the EEx engine to be used for compilation.
</li>
<li><code class="inline">:trim</code> - trims whitespace left/right of quotation tags
</li>
</ul>
<h2 id="module-engine" class="section-heading">
<a href="#module-engine" class="hover-link"><span class="icon-link" aria-hidden="true"></span></a>
Engine
</h2>
<p>EEx has the concept of engines which allows you to modify or
transform the code extracted from the given string or file.</p>
<p>By default, <a href="EEx.html#content"><code class="inline">EEx</code></a> uses the <a href="EEx.SmartEngine.html"><code class="inline">EEx.SmartEngine</code></a> that provides some
conveniences on top of the simple <a href="EEx.Engine.html"><code class="inline">EEx.Engine</code></a>.</p>
<h3 id="module-tags" class="section-heading">
<a href="#module-tags" class="hover-link"><span class="icon-link" aria-hidden="true"></span></a>
Tags
</h3>
<p><a href="EEx.SmartEngine.html"><code class="inline">EEx.SmartEngine</code></a> supports the following tags:</p>
<pre><code class="nohighlight makeup elixir"><span class="o"><</span><span class="p">%</span><span class="w"> </span><span class="nc">Elixir</span><span class="w"> </span><span class="n">expression</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="n">inline</span><span class="w"> </span><span class="k">with</span><span class="w"> </span><span class="n">output</span><span class="w"> </span><span class="p">%</span><span class="o">></span><span class="w">
</span><span class="o"><</span><span class="p">%</span><span class="o">=</span><span class="w"> </span><span class="nc">Elixir</span><span class="w"> </span><span class="n">expression</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="n">replace</span><span class="w"> </span><span class="k">with</span><span class="w"> </span><span class="n">result</span><span class="w"> </span><span class="p">%</span><span class="o">></span><span class="w">
</span><span class="o"><</span><span class="p">%</span><span class="p">%</span><span class="w"> </span><span class="nc">EEx</span><span class="w"> </span><span class="n">quotation</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="n">returns</span><span class="w"> </span><span class="n">the</span><span class="w"> </span><span class="n">contents</span><span class="w"> </span><span class="n">inside</span><span class="w"> </span><span class="p">%</span><span class="o">></span><span class="w">
</span><span class="o"><</span><span class="p">%</span><span class="c1"># Comments - they are discarded from source %></span></code></pre>
<p>All expressions that output something to the template
<strong>must</strong> use the equals sign (<code class="inline">=</code>). Since everything in
Elixir is an expression, there are no exceptions for this rule.
For example, while some template languages would special-case
<a href="https://hexdocs.pm/elixir/Kernel.html#if/2"><code class="inline">if/2</code></a> clauses, they are treated the same in EEx and
also require <code class="inline">=</code> in order to have their result printed:</p>
<pre><code class="nohighlight makeup elixir"><span class="o"><</span><span class="p">%</span><span class="o">=</span><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="no">true</span><span class="w"> </span><span class="k" data-group-id="7508954495-1">do</span><span class="w"> </span><span class="p">%</span><span class="o">></span><span class="w">
</span><span class="nc">It</span><span class="w"> </span><span class="n">is</span><span class="w"> </span><span class="n">obviously</span><span class="w"> </span><span class="no">true</span><span class="w">
</span><span class="o"><</span><span class="p">%</span><span class="w"> </span><span class="k" data-group-id="7508954495-1">else</span><span class="w"> </span><span class="p">%</span><span class="o">></span><span class="w">
</span><span class="nc">This</span><span class="w"> </span><span class="n">will</span><span class="w"> </span><span class="n">never</span><span class="w"> </span><span class="n">appear</span><span class="w">
</span><span class="o"><</span><span class="p">%</span><span class="w"> </span><span class="k" data-group-id="7508954495-1">end</span><span class="w"> </span><span class="p">%</span><span class="o">></span></code></pre>
<p>Notice that different engines may have different rules
for each tag. Other tags may be added in future versions.</p>
<h3 id="module-macros" class="section-heading">
<a href="#module-macros" class="hover-link"><span class="icon-link" aria-hidden="true"></span></a>
Macros
</h3>
<p><a href="EEx.SmartEngine.html"><code class="inline">EEx.SmartEngine</code></a> also adds some macros to your template.
An example is the <code class="inline">@</code> macro which allows easy data access
in a template:</p>
<pre><code class="nohighlight makeup elixir"><span class="gp unselectable">iex> </span><span class="nc">EEx</span><span class="o">.</span><span class="n">eval_string</span><span class="p" data-group-id="4169339682-1">(</span><span class="s">"<%= @foo %>"</span><span class="p">,</span><span class="w"> </span><span class="ss">assigns</span><span class="p">:</span><span class="w"> </span><span class="p" data-group-id="4169339682-2">[</span><span class="ss">foo</span><span class="p">:</span><span class="w"> </span><span class="mi">1</span><span class="p" data-group-id="4169339682-2">]</span><span class="p" data-group-id="4169339682-1">)</span><span class="w">
</span><span class="s">"1"</span></code></pre>
<p>In other words, <code class="inline"><%= @foo %></code> translates to:</p>
<pre><code class="nohighlight makeup elixir"><span class="o"><</span><span class="p">%</span><span class="o">=</span><span class="w"> </span><span class="p" data-group-id="6559525474-1">{</span><span class="ss">:ok</span><span class="p">,</span><span class="w"> </span><span class="n">v</span><span class="p" data-group-id="6559525474-1">}</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nc">Access</span><span class="o">.</span><span class="n">fetch</span><span class="p" data-group-id="6559525474-2">(</span><span class="n">assigns</span><span class="p">,</span><span class="w"> </span><span class="ss">:foo</span><span class="p" data-group-id="6559525474-2">)</span><span class="p">;</span><span class="w"> </span><span class="n">v</span><span class="w"> </span><span class="p">%</span><span class="o">></span></code></pre>
<p>The <code class="inline">assigns</code> extension is useful when the number of variables
required by the template is not specified at compilation time.</p>
</section>
<section id="summary" class="details-list">
<h1 class="section-heading">
<a class="hover-link" href="#summary">
<span class="icon-link" aria-hidden="true"></span>
<span class="sr-only">Link to this section</span>
</a>
Summary
</h1>
<div class="summary-functions summary">
<h2>
<a href="#functions">Functions</a>
</h2>
<div class="summary-row">
<div class="summary-signature">
<a href="#compile_file/2">compile_file(filename, options \\ [])</a>
</div>
<div class="summary-synopsis"><p>Gets a <code class="inline">filename</code> and generate a quoted expression
that can be evaluated by Elixir or compiled to a function</p>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#compile_string/2">compile_string(source, options \\ [])</a>
</div>
<div class="summary-synopsis"><p>Gets a string <code class="inline">source</code> and generate a quoted expression
that can be evaluated by Elixir or compiled to a function</p>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#eval_file/3">eval_file(filename, bindings \\ [], options \\ [])</a>
</div>
<div class="summary-synopsis"><p>Gets a <code class="inline">filename</code> and evaluate the values using the <code class="inline">bindings</code></p>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#eval_string/3">eval_string(source, bindings \\ [], options \\ [])</a>
</div>
<div class="summary-synopsis"><p>Gets a string <code class="inline">source</code> and evaluate the values using the <code class="inline">bindings</code></p>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#function_from_file/5">function_from_file(kind, name, file, args \\ [], options \\ [])</a>
</div>
<div class="summary-synopsis"><p>Generates a function definition from the file contents</p>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#function_from_string/5">function_from_string(kind, name, source, args \\ [], options \\ [])</a>
</div>
<div class="summary-synopsis"><p>Generates a function definition from the string</p>
</div>
</div>
</div>
</section>
<section id="functions" class="details-list">
<h1 class="section-heading">
<a class="hover-link" href="#functions">
<span class="icon-link" aria-hidden="true"></span>
<span class="sr-only">Link to this section</span>
</a>
Functions
</h1>
<div class="detail" id="compile_file/2">
<span id="compile_file/1"></span>
<div class="detail-header">
<a href="#compile_file/2" class="detail-link" title="Link to this function">
<span class="icon-link" aria-hidden="true"></span>
<span class="sr-only">Link to this function</span>
</a>
<span class="signature">compile_file(filename, options \\ [])</span>
<a href="https://github.com/elixir-lang/elixir/blob/v1.7.2/lib/eex/lib/eex.ex#L180" class="view-source" rel="help" title="View Source">
<span class="icon-code" aria-hidden="true"></span>
<span class="sr-only">View Source</span>
</a>
<div class="specs">
<pre>compile_file(<a href="https://hexdocs.pm/elixir/String.html#t:t/0">String.t</a>(), <a href="https://hexdocs.pm/elixir/typespecs.html#built-in-types">keyword</a>()) :: <a href="https://hexdocs.pm/elixir/Macro.html#t:t/0">Macro.t</a>() | <a href="https://hexdocs.pm/elixir/typespecs.html#built-in-types">no_return</a>()</pre>
</div>
</div>
<section class="docstring">
<p>Gets a <code class="inline">filename</code> and generate a quoted expression
that can be evaluated by Elixir or compiled to a function.</p>
</section>
</div>
<div class="detail" id="compile_string/2">
<span id="compile_string/1"></span>
<div class="detail-header">
<a href="#compile_string/2" class="detail-link" title="Link to this function">
<span class="icon-link" aria-hidden="true"></span>
<span class="sr-only">Link to this function</span>
</a>
<span class="signature">compile_string(source, options \\ [])</span>
<a href="https://github.com/elixir-lang/elixir/blob/v1.7.2/lib/eex/lib/eex.ex#L171" class="view-source" rel="help" title="View Source">
<span class="icon-code" aria-hidden="true"></span>
<span class="sr-only">View Source</span>
</a>
<div class="specs">
<pre>compile_string(<a href="https://hexdocs.pm/elixir/String.html#t:t/0">String.t</a>(), <a href="https://hexdocs.pm/elixir/typespecs.html#built-in-types">keyword</a>()) :: <a href="https://hexdocs.pm/elixir/Macro.html#t:t/0">Macro.t</a>() | <a href="https://hexdocs.pm/elixir/typespecs.html#built-in-types">no_return</a>()</pre>
</div>
</div>
<section class="docstring">
<p>Gets a string <code class="inline">source</code> and generate a quoted expression
that can be evaluated by Elixir or compiled to a function.</p>
</section>
</div>
<div class="detail" id="eval_file/3">
<span id="eval_file/1"></span>
<span id="eval_file/2"></span>
<div class="detail-header">
<a href="#eval_file/3" class="detail-link" title="Link to this function">
<span class="icon-link" aria-hidden="true"></span>
<span class="sr-only">Link to this function</span>
</a>
<span class="signature">eval_file(filename, bindings \\ [], options \\ [])</span>
<a href="https://github.com/elixir-lang/elixir/blob/v1.7.2/lib/eex/lib/eex.ex#L214" class="view-source" rel="help" title="View Source">
<span class="icon-code" aria-hidden="true"></span>
<span class="sr-only">View Source</span>
</a>
<div class="specs">
<pre>eval_file(<a href="https://hexdocs.pm/elixir/String.html#t:t/0">String.t</a>(), <a href="https://hexdocs.pm/elixir/typespecs.html#built-in-types">keyword</a>(), <a href="https://hexdocs.pm/elixir/typespecs.html#built-in-types">keyword</a>()) :: <a href="https://hexdocs.pm/elixir/typespecs.html#basic-types">any</a>()</pre>
</div>
</div>
<section class="docstring">
<p>Gets a <code class="inline">filename</code> and evaluate the values using the <code class="inline">bindings</code>.</p>
<h2 id="eval_file/3-examples" class="section-heading">
<a href="#eval_file/3-examples" class="hover-link"><span class="icon-link" aria-hidden="true"></span></a>
Examples
</h2>
<pre><code class="nohighlight makeup elixir"><span class="c1"># sample.eex</span><span class="w">
</span><span class="n">foo</span><span class="w"> </span><span class="o"><</span><span class="p">%</span><span class="o">=</span><span class="w"> </span><span class="n">bar</span><span class="w"> </span><span class="p">%</span><span class="o">></span><span class="w">
</span><span class="c1"># iex</span><span class="w">
</span><span class="nc">EEx</span><span class="o">.</span><span class="n">eval_file</span><span class="w"> </span><span class="s">"sample.eex"</span><span class="p">,</span><span class="w"> </span><span class="p" data-group-id="3293997949-1">[</span><span class="ss">bar</span><span class="p">:</span><span class="w"> </span><span class="s">"baz"</span><span class="p" data-group-id="3293997949-1">]</span><span class="w"> </span><span class="c1">#=> "foo baz"</span></code></pre>
</section>
</div>
<div class="detail" id="eval_string/3">
<span id="eval_string/1"></span>
<span id="eval_string/2"></span>
<div class="detail-header">
<a href="#eval_string/3" class="detail-link" title="Link to this function">
<span class="icon-link" aria-hidden="true"></span>
<span class="sr-only">Link to this function</span>
</a>
<span class="signature">eval_string(source, bindings \\ [], options \\ [])</span>
<a href="https://github.com/elixir-lang/elixir/blob/v1.7.2/lib/eex/lib/eex.ex#L195" class="view-source" rel="help" title="View Source">
<span class="icon-code" aria-hidden="true"></span>
<span class="sr-only">View Source</span>
</a>
<div class="specs">
<pre>eval_string(<a href="https://hexdocs.pm/elixir/String.html#t:t/0">String.t</a>(), <a href="https://hexdocs.pm/elixir/typespecs.html#built-in-types">keyword</a>(), <a href="https://hexdocs.pm/elixir/typespecs.html#built-in-types">keyword</a>()) :: <a href="https://hexdocs.pm/elixir/typespecs.html#basic-types">any</a>()</pre>
</div>
</div>
<section class="docstring">
<p>Gets a string <code class="inline">source</code> and evaluate the values using the <code class="inline">bindings</code>.</p>
<h2 id="eval_string/3-examples" class="section-heading">
<a href="#eval_string/3-examples" class="hover-link"><span class="icon-link" aria-hidden="true"></span></a>
Examples
</h2>
<pre><code class="nohighlight makeup elixir"><span class="gp unselectable">iex> </span><span class="nc">EEx</span><span class="o">.</span><span class="n">eval_string</span><span class="p" data-group-id="3317580728-1">(</span><span class="s">"foo <%= bar %>"</span><span class="p">,</span><span class="w"> </span><span class="ss">bar</span><span class="p">:</span><span class="w"> </span><span class="s">"baz"</span><span class="p" data-group-id="3317580728-1">)</span><span class="w">
</span><span class="s">"foo baz"</span></code></pre>
</section>
</div>
<div class="detail" id="function_from_file/5">
<span id="function_from_file/3"></span>
<span id="function_from_file/4"></span>
<div class="detail-header">
<a href="#function_from_file/5" class="detail-link" title="Link to this macro">
<span class="icon-link" aria-hidden="true"></span>
<span class="sr-only">Link to this macro</span>
</a>
<span class="signature">function_from_file(kind, name, file, args \\ [], options \\ [])</span>
<a href="https://github.com/elixir-lang/elixir/blob/v1.7.2/lib/eex/lib/eex.ex#L151" class="view-source" rel="help" title="View Source">
<span class="icon-code" aria-hidden="true"></span>
<span class="sr-only">View Source</span>
</a>
<span class="note">(macro)</span>
</div>
<section class="docstring">
<p>Generates a function definition from the file contents.</p>
<p>The kind (<code class="inline">:def</code> or <code class="inline">:defp</code>) must be given, the
function name, its arguments and the compilation options.</p>
<p>This function is useful in case you have templates but
you want to precompile inside a module for speed.</p>
<h2 id="function_from_file/5-examples" class="section-heading">
<a href="#function_from_file/5-examples" class="hover-link"><span class="icon-link" aria-hidden="true"></span></a>
Examples
</h2>
<pre><code class="nohighlight makeup elixir"><span class="c1"># sample.eex</span><span class="w">
</span><span class="o"><</span><span class="p">%</span><span class="o">=</span><span class="w"> </span><span class="n">a</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">b</span><span class="w"> </span><span class="p">%</span><span class="o">></span><span class="w">
</span><span class="c1"># sample.ex</span><span class="w">
</span><span class="kd">defmodule</span><span class="w"> </span><span class="nc">Sample</span><span class="w"> </span><span class="k" data-group-id="2002699792-1">do</span><span class="w">
</span><span class="kn">require</span><span class="w"> </span><span class="nc">EEx</span><span class="w">
</span><span class="nc">EEx</span><span class="o">.</span><span class="n">function_from_file</span><span class="w"> </span><span class="ss">:def</span><span class="p">,</span><span class="w"> </span><span class="ss">:sample</span><span class="p">,</span><span class="w"> </span><span class="s">"sample.eex"</span><span class="p">,</span><span class="w"> </span><span class="p" data-group-id="2002699792-2">[</span><span class="ss">:a</span><span class="p">,</span><span class="w"> </span><span class="ss">:b</span><span class="p" data-group-id="2002699792-2">]</span><span class="w">
</span><span class="k" data-group-id="2002699792-1">end</span><span class="w">
</span><span class="c1"># iex</span><span class="w">
</span><span class="nc">Sample</span><span class="o">.</span><span class="n">sample</span><span class="p" data-group-id="2002699792-3">(</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p" data-group-id="2002699792-3">)</span><span class="w"> </span><span class="c1">#=> "3"</span></code></pre>
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<div class="detail" id="function_from_string/5">
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<span class="signature">function_from_string(kind, name, source, args \\ [], options \\ [])</span>
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<section class="docstring">
<p>Generates a function definition from the string.</p>
<p>The kind (<code class="inline">:def</code> or <code class="inline">:defp</code>) must be given, the
function name, its arguments and the compilation options.</p>
<h2 id="function_from_string/5-examples" class="section-heading">
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Examples
</h2>
<pre><code class="nohighlight makeup elixir"><span class="gp unselectable">iex> </span><span class="kd">defmodule</span><span class="w"> </span><span class="nc">Sample</span><span class="w"> </span><span class="k" data-group-id="1428873992-1">do</span><span class="w">
</span><span class="gp unselectable">...> </span><span class="w"> </span><span class="kn">require</span><span class="w"> </span><span class="nc">EEx</span><span class="w">
</span><span class="gp unselectable">...> </span><span class="w"> </span><span class="nc">EEx</span><span class="o">.</span><span class="n">function_from_string</span><span class="w"> </span><span class="ss">:def</span><span class="p">,</span><span class="w"> </span><span class="ss">:sample</span><span class="p">,</span><span class="w"> </span><span class="s">"<%= a + b %>"</span><span class="p">,</span><span class="w"> </span><span class="p" data-group-id="1428873992-2">[</span><span class="ss">:a</span><span class="p">,</span><span class="w"> </span><span class="ss">:b</span><span class="p" data-group-id="1428873992-2">]</span><span class="w">
</span><span class="gp unselectable">...> </span><span class="k" data-group-id="1428873992-1">end</span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="nc">Sample</span><span class="o">.</span><span class="n">sample</span><span class="p" data-group-id="1428873992-3">(</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p" data-group-id="1428873992-3">)</span><span class="w">
</span><span class="s">"3"</span></code></pre>
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