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Editing: list.html

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  <section id="list">
<span id="command:list"></span><h1>list<a class="headerlink" href="#list" title="Permalink to this heading">¶</a></h1>
<p>List operations.</p>
<section id="synopsis">
<h2>Synopsis<a class="headerlink" href="#synopsis" title="Permalink to this heading">¶</a></h2>
<pre class="literal-block"><a class="reference internal" href="#reading">Reading</a>
  list(<a class="reference internal" href="#length">LENGTH</a> &lt;list&gt; &lt;out-var&gt;)
  list(<a class="reference internal" href="#get">GET</a> &lt;list&gt; &lt;element index&gt; [&lt;index&gt; ...] &lt;out-var&gt;)
  list(<a class="reference internal" href="#join">JOIN</a> &lt;list&gt; &lt;glue&gt; &lt;out-var&gt;)
  list(<a class="reference internal" href="#sublist">SUBLIST</a> &lt;list&gt; &lt;begin&gt; &lt;length&gt; &lt;out-var&gt;)

<a class="reference internal" href="#search">Search</a>
  list(<a class="reference internal" href="#find">FIND</a> &lt;list&gt; &lt;value&gt; &lt;out-var&gt;)

<a class="reference internal" href="#modification">Modification</a>
  list(<a class="reference internal" href="#append">APPEND</a> &lt;list&gt; [&lt;element&gt;...])
  list(<a class="reference internal" href="#filter">FILTER</a> &lt;list&gt; {INCLUDE | EXCLUDE} REGEX &lt;regex&gt;)
  list(<a class="reference internal" href="#insert">INSERT</a> &lt;list&gt; &lt;index&gt; [&lt;element&gt;...])
  list(<a class="reference internal" href="#pop-back">POP_BACK</a> &lt;list&gt; [&lt;out-var&gt;...])
  list(<a class="reference internal" href="#pop-front">POP_FRONT</a> &lt;list&gt; [&lt;out-var&gt;...])
  list(<a class="reference internal" href="#prepend">PREPEND</a> &lt;list&gt; [&lt;element&gt;...])
  list(<a class="reference internal" href="#remove-item">REMOVE_ITEM</a> &lt;list&gt; &lt;value&gt;...)
  list(<a class="reference internal" href="#remove-at">REMOVE_AT</a> &lt;list&gt; &lt;index&gt;...)
  list(<a class="reference internal" href="#remove-duplicates">REMOVE_DUPLICATES</a> &lt;list&gt;)
  list(<a class="reference internal" href="#transform">TRANSFORM</a> &lt;list&gt; &lt;ACTION&gt; [...])

<a class="reference internal" href="#ordering">Ordering</a>
  list(<a class="reference internal" href="#reverse">REVERSE</a> &lt;list&gt;)
  list(<a class="reference internal" href="#sort">SORT</a> &lt;list&gt; [...])</pre>
</section>
<section id="introduction">
<h2>Introduction<a class="headerlink" href="#introduction" title="Permalink to this heading">¶</a></h2>
<p>The list subcommands <code class="docutils literal notranslate"><span class="pre">APPEND</span></code>, <code class="docutils literal notranslate"><span class="pre">INSERT</span></code>, <code class="docutils literal notranslate"><span class="pre">FILTER</span></code>, <code class="docutils literal notranslate"><span class="pre">PREPEND</span></code>,
<code class="docutils literal notranslate"><span class="pre">POP_BACK</span></code>, <code class="docutils literal notranslate"><span class="pre">POP_FRONT</span></code>, <code class="docutils literal notranslate"><span class="pre">REMOVE_AT</span></code>, <code class="docutils literal notranslate"><span class="pre">REMOVE_ITEM</span></code>,
<code class="docutils literal notranslate"><span class="pre">REMOVE_DUPLICATES</span></code>, <code class="docutils literal notranslate"><span class="pre">REVERSE</span></code> and <code class="docutils literal notranslate"><span class="pre">SORT</span></code> may create
new values for the list within the current CMake variable scope.  Similar to
the <span class="target" id="index-0-command:set"></span><a class="reference internal" href="set.html#command:set" title="set"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">set()</span></code></a> command, the LIST command creates new variable values in
the current scope, even if the list itself is actually defined in a parent
scope.  To propagate the results of these operations upwards, use
<span class="target" id="index-1-command:set"></span><a class="reference internal" href="set.html#command:set" title="set"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">set()</span></code></a> with <code class="docutils literal notranslate"><span class="pre">PARENT_SCOPE</span></code>, <span class="target" id="index-2-command:set"></span><a class="reference internal" href="set.html#command:set" title="set"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">set()</span></code></a> with
<code class="docutils literal notranslate"><span class="pre">CACHE</span> <span class="pre">INTERNAL</span></code>, or some other means of value propagation.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>A list in cmake is a <code class="docutils literal notranslate"><span class="pre">;</span></code> separated group of strings.  To create a
list the set command can be used.  For example, <code class="docutils literal notranslate"><span class="pre">set(var</span> <span class="pre">a</span> <span class="pre">b</span> <span class="pre">c</span> <span class="pre">d</span> <span class="pre">e)</span></code>
creates a list with <code class="docutils literal notranslate"><span class="pre">a;b;c;d;e</span></code>, and <code class="docutils literal notranslate"><span class="pre">set(var</span> <span class="pre">&quot;a</span> <span class="pre">b</span> <span class="pre">c</span> <span class="pre">d</span> <span class="pre">e&quot;)</span></code> creates a
string or a list with one item in it.   (Note macro arguments are not
variables, and therefore cannot be used in LIST commands.)</p>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>When specifying index values, if <code class="docutils literal notranslate"><span class="pre">&lt;element</span> <span class="pre">index&gt;</span></code> is 0 or greater, it
is indexed from the beginning of the list, with 0 representing the
first list element.  If <code class="docutils literal notranslate"><span class="pre">&lt;element</span> <span class="pre">index&gt;</span></code> is -1 or lesser, it is indexed
from the end of the list, with -1 representing the last list element.
Be careful when counting with negative indices: they do not start from
0.  -0 is equivalent to 0, the first list element.</p>
</div>
</section>
<section id="reading">
<h2>Reading<a class="headerlink" href="#reading" title="Permalink to this heading">¶</a></h2>
<div class="highlight-cmake notranslate" id="length"><div class="highlight"><pre><span></span><span class="nf">list(</span><span class="no">LENGTH</span><span class="w"> </span><span class="nv">&lt;list&gt;</span><span class="w"> </span><span class="nv">&lt;output variable&gt;</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
<p>Returns the list's length.</p>
<div class="highlight-cmake notranslate" id="get"><div class="highlight"><pre><span></span><span class="nf">list(</span><span class="no">GET</span><span class="w"> </span><span class="nv">&lt;list&gt;</span><span class="w"> </span><span class="nv">&lt;element index&gt;</span><span class="w"> </span><span class="p">[</span><span class="nv">&lt;element index&gt;</span><span class="w"> </span><span class="p">...]</span><span class="w"> </span><span class="nv">&lt;output variable&gt;</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
<p>Returns the list of elements specified by indices from the list.</p>
<div class="highlight-cmake notranslate" id="join"><div class="highlight"><pre><span></span><span class="nf">list(</span><span class="no">JOIN</span><span class="w"> </span><span class="nv">&lt;list&gt;</span><span class="w"> </span><span class="nv">&lt;glue&gt;</span><span class="w"> </span><span class="nv">&lt;output variable&gt;</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.12.</span></p>
</div>
<p>Returns a string joining all list's elements using the glue string.
To join multiple strings, which are not part of a list, use <code class="docutils literal notranslate"><span class="pre">JOIN</span></code> operator
from <span class="target" id="index-0-command:string"></span><a class="reference internal" href="string.html#command:string" title="string"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">string()</span></code></a> command.</p>
<div class="highlight-cmake notranslate" id="sublist"><div class="highlight"><pre><span></span><span class="nf">list(</span><span class="no">SUBLIST</span><span class="w"> </span><span class="nv">&lt;list&gt;</span><span class="w"> </span><span class="nv">&lt;begin&gt;</span><span class="w"> </span><span class="nv">&lt;length&gt;</span><span class="w"> </span><span class="nv">&lt;output variable&gt;</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.12.</span></p>
</div>
<p>Returns a sublist of the given list.
If <code class="docutils literal notranslate"><span class="pre">&lt;length&gt;</span></code> is 0, an empty list will be returned.
If <code class="docutils literal notranslate"><span class="pre">&lt;length&gt;</span></code> is -1 or the list is smaller than <code class="docutils literal notranslate"><span class="pre">&lt;begin&gt;+&lt;length&gt;</span></code> then
the remaining elements of the list starting at <code class="docutils literal notranslate"><span class="pre">&lt;begin&gt;</span></code> will be returned.</p>
</section>
<section id="search">
<h2>Search<a class="headerlink" href="#search" title="Permalink to this heading">¶</a></h2>
<div class="highlight-cmake notranslate" id="find"><div class="highlight"><pre><span></span><span class="nf">list(</span><span class="no">FIND</span><span class="w"> </span><span class="nv">&lt;list&gt;</span><span class="w"> </span><span class="nv">&lt;value&gt;</span><span class="w"> </span><span class="nv">&lt;output variable&gt;</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
<p>Returns the index of the element specified in the list or -1
if it wasn't found.</p>
</section>
<section id="modification">
<h2>Modification<a class="headerlink" href="#modification" title="Permalink to this heading">¶</a></h2>
<div class="highlight-cmake notranslate" id="append"><div class="highlight"><pre><span></span><span class="nf">list(</span><span class="no">APPEND</span><span class="w"> </span><span class="nv">&lt;list&gt;</span><span class="w"> </span><span class="p">[</span><span class="nv">&lt;element&gt;</span><span class="w"> </span><span class="p">...]</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
<p>Appends elements to the list. If no variable named <code class="docutils literal notranslate"><span class="pre">&lt;list&gt;</span></code> exists in the
current scope its value is treated as empty and the elements are appended to
that empty list.</p>
<div class="highlight-cmake notranslate" id="filter"><div class="highlight"><pre><span></span><span class="nf">list(</span><span class="no">FILTER</span><span class="w"> </span><span class="nv">&lt;list&gt;</span><span class="w"> </span><span class="o">&lt;</span><span class="no">INCLUDE</span><span class="p">|</span><span class="no">EXCLUDE</span><span class="o">&gt;</span><span class="w"> </span><span class="no">REGEX</span><span class="w"> </span><span class="nv">&lt;regular_expression&gt;</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.6.</span></p>
</div>
<p>Includes or removes items from the list that match the mode's pattern.
In <code class="docutils literal notranslate"><span class="pre">REGEX</span></code> mode, items will be matched against the given regular expression.</p>
<p>For more information on regular expressions look under
<a class="reference internal" href="string.html#regex-specification"><span class="std std-ref">string(REGEX)</span></a>.</p>
<div class="highlight-cmake notranslate" id="insert"><div class="highlight"><pre><span></span><span class="nf">list(</span><span class="no">INSERT</span><span class="w"> </span><span class="nv">&lt;list&gt;</span><span class="w"> </span><span class="nv">&lt;element_index&gt;</span><span class="w"> </span><span class="nv">&lt;element&gt;</span><span class="w"> </span><span class="p">[</span><span class="nv">&lt;element&gt;</span><span class="w"> </span><span class="p">...]</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
<p>Inserts elements to the list to the specified index. It is an
error to specify an out-of-range index. Valid indexes are 0 to <cite>N</cite>
where <cite>N</cite> is the length of the list, inclusive. An empty list
has length 0. If no variable named <code class="docutils literal notranslate"><span class="pre">&lt;list&gt;</span></code> exists in the
current scope its value is treated as empty and the elements are
inserted in that empty list.</p>
<div class="highlight-cmake notranslate" id="pop-back"><div class="highlight"><pre><span></span><span class="nf">list(</span><span class="no">POP_BACK</span><span class="w"> </span><span class="nv">&lt;list&gt;</span><span class="w"> </span><span class="p">[</span><span class="nv">&lt;out-var&gt;...</span><span class="p">]</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.15.</span></p>
</div>
<p>If no variable name is given, removes exactly one element. Otherwise,
with <cite>N</cite> variable names provided, assign the last <cite>N</cite> elements' values
to the given variables and then remove the last <cite>N</cite> values from
<code class="docutils literal notranslate"><span class="pre">&lt;list&gt;</span></code>.</p>
<div class="highlight-cmake notranslate" id="pop-front"><div class="highlight"><pre><span></span><span class="nf">list(</span><span class="no">POP_FRONT</span><span class="w"> </span><span class="nv">&lt;list&gt;</span><span class="w"> </span><span class="p">[</span><span class="nv">&lt;out-var&gt;...</span><span class="p">]</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.15.</span></p>
</div>
<p>If no variable name is given, removes exactly one element. Otherwise,
with <cite>N</cite> variable names provided, assign the first <cite>N</cite> elements' values
to the given variables and then remove the first <cite>N</cite> values from
<code class="docutils literal notranslate"><span class="pre">&lt;list&gt;</span></code>.</p>
<div class="highlight-cmake notranslate" id="prepend"><div class="highlight"><pre><span></span><span class="nf">list(</span><span class="no">PREPEND</span><span class="w"> </span><span class="nv">&lt;list&gt;</span><span class="w"> </span><span class="p">[</span><span class="nv">&lt;element&gt;</span><span class="w"> </span><span class="p">...]</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.15.</span></p>
</div>
<p>Insert elements to the 0th position in the list. If no variable named
<code class="docutils literal notranslate"><span class="pre">&lt;list&gt;</span></code> exists in the current scope its value is treated as empty and
the elements are prepended to that empty list.</p>
<div class="highlight-cmake notranslate" id="remove-item"><div class="highlight"><pre><span></span><span class="nf">list(</span><span class="no">REMOVE_ITEM</span><span class="w"> </span><span class="nv">&lt;list&gt;</span><span class="w"> </span><span class="nv">&lt;value&gt;</span><span class="w"> </span><span class="p">[</span><span class="nv">&lt;value&gt;</span><span class="w"> </span><span class="p">...]</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
<p>Removes all instances of the given items from the list.</p>
<div class="highlight-cmake notranslate" id="remove-at"><div class="highlight"><pre><span></span><span class="nf">list(</span><span class="no">REMOVE_AT</span><span class="w"> </span><span class="nv">&lt;list&gt;</span><span class="w"> </span><span class="nv">&lt;index&gt;</span><span class="w"> </span><span class="p">[</span><span class="nv">&lt;index&gt;</span><span class="w"> </span><span class="p">...]</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
<p>Removes items at given indices from the list.</p>
<div class="highlight-cmake notranslate" id="remove-duplicates"><div class="highlight"><pre><span></span><span class="nf">list(</span><span class="no">REMOVE_DUPLICATES</span><span class="w"> </span><span class="nv">&lt;list&gt;</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
<p>Removes duplicated items in the list. The relative order of items is preserved,
but if duplicates are encountered, only the first instance is preserved.</p>
<div class="highlight-cmake notranslate" id="transform"><div class="highlight"><pre><span></span><span class="nf">list(</span><span class="no">TRANSFORM</span><span class="w"> </span><span class="nv">&lt;list&gt;</span><span class="w"> </span><span class="nv">&lt;ACTION&gt;</span><span class="w"> </span><span class="p">[</span><span class="nv">&lt;SELECTOR&gt;</span><span class="p">]</span><span class="w"></span>
<span class="w">                      </span><span class="p">[</span><span class="no">OUTPUT_VARIABLE</span><span class="w"> </span><span class="nv">&lt;output variable&gt;</span><span class="p">]</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.12.</span></p>
</div>
<p>Transforms the list by applying an action to all or, by specifying a
<code class="docutils literal notranslate"><span class="pre">&lt;SELECTOR&gt;</span></code>, to the selected elements of the list, storing the result
in-place or in the specified output variable.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>The <code class="docutils literal notranslate"><span class="pre">TRANSFORM</span></code> sub-command does not change the number of elements in the
list. If a <code class="docutils literal notranslate"><span class="pre">&lt;SELECTOR&gt;</span></code> is specified, only some elements will be changed,
the other ones will remain the same as before the transformation.</p>
</div>
<p><code class="docutils literal notranslate"><span class="pre">&lt;ACTION&gt;</span></code> specifies the action to apply to the elements of the list.
The actions have exactly the same semantics as sub-commands of the
<span class="target" id="index-1-command:string"></span><a class="reference internal" href="string.html#command:string" title="string"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">string()</span></code></a> command.  <code class="docutils literal notranslate"><span class="pre">&lt;ACTION&gt;</span></code> must be one of the following:</p>
<p><code class="docutils literal notranslate"><span class="pre">APPEND</span></code>, <code class="docutils literal notranslate"><span class="pre">PREPEND</span></code>: Append, prepend specified value to each element of
the list.</p>
<blockquote>
<div><div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">list(</span><span class="no">TRANSFORM</span><span class="w"> </span><span class="nv">&lt;list&gt;</span><span class="w"> </span><span class="o">&lt;</span><span class="no">APPEND</span><span class="p">|</span><span class="no">PREPEND</span><span class="o">&gt;</span><span class="w"> </span><span class="nv">&lt;value&gt;</span><span class="w"> </span><span class="p">...</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
</div></blockquote>
<p><code class="docutils literal notranslate"><span class="pre">TOUPPER</span></code>, <code class="docutils literal notranslate"><span class="pre">TOLOWER</span></code>: Convert each element of the list to upper, lower
characters.</p>
<blockquote>
<div><div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">list(</span><span class="no">TRANSFORM</span><span class="w"> </span><span class="nv">&lt;list&gt;</span><span class="w"> </span><span class="o">&lt;</span><span class="no">TOLOWER</span><span class="p">|</span><span class="no">TOUPPER</span><span class="o">&gt;</span><span class="w"> </span><span class="p">...</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
</div></blockquote>
<p><code class="docutils literal notranslate"><span class="pre">STRIP</span></code>: Remove leading and trailing spaces from each element of the
list.</p>
<blockquote>
<div><div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">list(</span><span class="no">TRANSFORM</span><span class="w"> </span><span class="nv">&lt;list&gt;</span><span class="w"> </span><span class="no">STRIP</span><span class="w"> </span><span class="p">...</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
</div></blockquote>
<p><code class="docutils literal notranslate"><span class="pre">GENEX_STRIP</span></code>: Strip any
<span class="target" id="index-0-manual:cmake-generator-expressions(7)"></span><a class="reference internal" href="../manual/cmake-generator-expressions.7.html#manual:cmake-generator-expressions(7)" title="cmake-generator-expressions(7)"><code class="xref cmake cmake-manual docutils literal notranslate"><span class="pre">generator</span> <span class="pre">expressions</span></code></a> from each
element of the list.</p>
<blockquote>
<div><div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">list(</span><span class="no">TRANSFORM</span><span class="w"> </span><span class="nv">&lt;list&gt;</span><span class="w"> </span><span class="no">GENEX_STRIP</span><span class="w"> </span><span class="p">...</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
</div></blockquote>
<p><code class="docutils literal notranslate"><span class="pre">REPLACE</span></code>: Match the regular expression as many times as possible and
substitute the replacement expression for the match for each element
of the list
(Same semantic as <code class="docutils literal notranslate"><span class="pre">REGEX</span> <span class="pre">REPLACE</span></code> from <span class="target" id="index-2-command:string"></span><a class="reference internal" href="string.html#command:string" title="string"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">string()</span></code></a> command).</p>
<blockquote>
<div><div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">list(</span><span class="no">TRANSFORM</span><span class="w"> </span><span class="nv">&lt;list&gt;</span><span class="w"> </span><span class="no">REPLACE</span><span class="w"> </span><span class="nv">&lt;regular_expression&gt;</span><span class="w"></span>
<span class="w">                              </span><span class="nv">&lt;replace_expression&gt;</span><span class="w"> </span><span class="p">...</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
</div></blockquote>
<p><code class="docutils literal notranslate"><span class="pre">&lt;SELECTOR&gt;</span></code> determines which elements of the list will be transformed.
Only one type of selector can be specified at a time.  When given,
<code class="docutils literal notranslate"><span class="pre">&lt;SELECTOR&gt;</span></code> must be one of the following:</p>
<p><code class="docutils literal notranslate"><span class="pre">AT</span></code>: Specify a list of indexes.</p>
<blockquote>
<div><div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">list(</span><span class="no">TRANSFORM</span><span class="w"> </span><span class="nv">&lt;list&gt;</span><span class="w"> </span><span class="nv">&lt;ACTION&gt;</span><span class="w"> </span><span class="no">AT</span><span class="w"> </span><span class="nv">&lt;index&gt;</span><span class="w"> </span><span class="p">[</span><span class="nv">&lt;index&gt;</span><span class="w"> </span><span class="p">...]</span><span class="w"> </span><span class="p">...</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
</div></blockquote>
<p><code class="docutils literal notranslate"><span class="pre">FOR</span></code>: Specify a range with, optionally, an increment used to iterate over
the range.</p>
<blockquote>
<div><div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">list(</span><span class="no">TRANSFORM</span><span class="w"> </span><span class="nv">&lt;list&gt;</span><span class="w"> </span><span class="nv">&lt;ACTION&gt;</span><span class="w"> </span><span class="no">FOR</span><span class="w"> </span><span class="nv">&lt;start&gt;</span><span class="w"> </span><span class="nv">&lt;stop&gt;</span><span class="w"> </span><span class="p">[</span><span class="nv">&lt;step&gt;</span><span class="p">]</span><span class="w"> </span><span class="p">...</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
</div></blockquote>
<p><code class="docutils literal notranslate"><span class="pre">REGEX</span></code>: Specify a regular expression. Only elements matching the regular
expression will be transformed.</p>
<blockquote>
<div><div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">list(</span><span class="no">TRANSFORM</span><span class="w"> </span><span class="nv">&lt;list&gt;</span><span class="w"> </span><span class="nv">&lt;ACTION&gt;</span><span class="w"> </span><span class="no">REGEX</span><span class="w"> </span><span class="nv">&lt;regular_expression&gt;</span><span class="w"> </span><span class="p">...</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
</div></blockquote>
</section>
<section id="ordering">
<h2>Ordering<a class="headerlink" href="#ordering" title="Permalink to this heading">¶</a></h2>
<div class="highlight-cmake notranslate" id="reverse"><div class="highlight"><pre><span></span><span class="nf">list(</span><span class="no">REVERSE</span><span class="w"> </span><span class="nv">&lt;list&gt;</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
<p>Reverses the contents of the list in-place.</p>
<div class="highlight-cmake notranslate" id="sort"><div class="highlight"><pre><span></span><span class="nf">list(</span><span class="no">SORT</span><span class="w"> </span><span class="nv">&lt;list&gt;</span><span class="w"> </span><span class="p">[</span><span class="no">COMPARE</span><span class="w"> </span><span class="nv">&lt;compare&gt;</span><span class="p">]</span><span class="w"> </span><span class="p">[</span><span class="no">CASE</span><span class="w"> </span><span class="nv">&lt;case&gt;</span><span class="p">]</span><span class="w"> </span><span class="p">[</span><span class="no">ORDER</span><span class="w"> </span><span class="nv">&lt;order&gt;</span><span class="p">]</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
<p>Sorts the list in-place alphabetically.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.13: </span>Added the <code class="docutils literal notranslate"><span class="pre">COMPARE</span></code>, <code class="docutils literal notranslate"><span class="pre">CASE</span></code>, and <code class="docutils literal notranslate"><span class="pre">ORDER</span></code> options.</p>
</div>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.18: </span>Added the <code class="docutils literal notranslate"><span class="pre">COMPARE</span> <span class="pre">NATURAL</span></code> option.</p>
</div>
<p>Use the <code class="docutils literal notranslate"><span class="pre">COMPARE</span></code> keyword to select the comparison method for sorting.
The <code class="docutils literal notranslate"><span class="pre">&lt;compare&gt;</span></code> option should be one of:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">STRING</span></code>: Sorts a list of strings alphabetically.  This is the
default behavior if the <code class="docutils literal notranslate"><span class="pre">COMPARE</span></code> option is not given.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">FILE_BASENAME</span></code>: Sorts a list of pathnames of files by their basenames.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">NATURAL</span></code>: Sorts a list of strings using natural order
(see <code class="docutils literal notranslate"><span class="pre">strverscmp(3)</span></code> manual), i.e. such that contiguous digits
are compared as whole numbers.
For example: the following list <cite>10.0 1.1 2.1 8.0 2.0 3.1</cite>
will be sorted as <cite>1.1 2.0 2.1 3.1 8.0 10.0</cite> if the <code class="docutils literal notranslate"><span class="pre">NATURAL</span></code>
comparison is selected where it will be sorted as
<cite>1.1 10.0 2.0 2.1 3.1 8.0</cite> with the <code class="docutils literal notranslate"><span class="pre">STRING</span></code> comparison.</p></li>
</ul>
<p>Use the <code class="docutils literal notranslate"><span class="pre">CASE</span></code> keyword to select a case sensitive or case insensitive
sort mode.  The <code class="docutils literal notranslate"><span class="pre">&lt;case&gt;</span></code> option should be one of:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">SENSITIVE</span></code>: List items are sorted in a case-sensitive manner.  This is
the default behavior if the <code class="docutils literal notranslate"><span class="pre">CASE</span></code> option is not given.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">INSENSITIVE</span></code>: List items are sorted case insensitively.  The order of
items which differ only by upper/lowercase is not specified.</p></li>
</ul>
<p>To control the sort order, the <code class="docutils literal notranslate"><span class="pre">ORDER</span></code> keyword can be given.
The <code class="docutils literal notranslate"><span class="pre">&lt;order&gt;</span></code> option should be one of:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">ASCENDING</span></code>: Sorts the list in ascending order.  This is the default
behavior when the <code class="docutils literal notranslate"><span class="pre">ORDER</span></code> option is not given.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">DESCENDING</span></code>: Sorts the list in descending order.</p></li>
</ul>
</section>
</section>

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