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<div class="document" id="ctags-lang-r">
<span id="ctags-lang-r-7"></span>
<h1 class="title">ctags-lang-r</h1>
<h2 class="subtitle" id="random-notes-about-tagging-r-source-code-with-universal-ctags">Random notes about tagging R source code with Universal Ctags</h2>
<table class="docinfo" frame="void" rules="none">
<col class="docinfo-name" />
<col class="docinfo-content" />
<tbody valign="top">
<tr><th class="docinfo-name">Version:</th>
<td>5.9.0</td></tr>
<tr class="manual-group field"><th class="docinfo-name">Manual group:</th><td class="field-body">Universal Ctags</td>
</tr>
<tr class="manual-section field"><th class="docinfo-name">Manual section:</th><td class="field-body">7</td>
</tr>
</tbody>
</table>
<div class="section" id="synopsis">
<h1>SYNOPSIS</h1>
<div class="line-block">
<div class="line"><strong>ctags</strong> ... --languages=+R ...</div>
<div class="line"><strong>ctags</strong> ... --language-force=R ...</div>
<div class="line"><strong>ctags</strong> ... --map-Python=+.r ...</div>
</div>
</div>
<div class="section" id="description">
<h1>DESCRIPTION</h1>
<p>This man page gathers random notes about tagging R source code
with Universal Ctags.</p>
</div>
<div class="section" id="kinds">
<h1>Kinds</h1>
<p>If a variable gets a value returned from a <em>well-known constructor</em>
and the variable appears for the first time in the current input file,
the R parser makes a tag for the variable and attaches a kind
associated with the constructor to the tag regardless of whether
the variable appears in the top-level context or a function.</p>
<p>Well-known constructor and kind mapping</p>
<blockquote>
<table border="1" class="docutils">
<colgroup>
<col width="40%" />
<col width="60%" />
</colgroup>
<thead valign="bottom">
<tr><th class="head">Constructor</th>
<th class="head">kind</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>function()</td>
<td>function</td>
</tr>
<tr><td>c()</td>
<td>vector</td>
</tr>
<tr><td>list()</td>
<td>list</td>
</tr>
<tr><td>data.frame()</td>
<td>dataframe</td>
</tr>
</tbody>
</table>
</blockquote>
<p>If a variable doesn't get a value returned from one of well-known
constructors, the R parser attaches <tt class="docutils literal">globalVar</tt> or <tt class="docutils literal">functionVar</tt> kind
to the tag for the variable depending on the context.</p>
<p>Here is an example demonstrating the usage of the kinds:</p>
<p>"input.r"</p>
<pre class="code R literal-block">
<span class="name">G</span> <span class="operator"><-</span> <span class="literal number">1</span>
<span class="name">v</span> <span class="operator"><-</span> <span class="name function">c</span><span class="punctuation">(</span><span class="literal number">1</span><span class="punctuation">,</span> <span class="literal number">2</span><span class="punctuation">)</span>
<span class="name">l</span> <span class="operator"><-</span> <span class="name function">list</span><span class="punctuation">(</span><span class="literal number">3</span><span class="punctuation">,</span> <span class="literal number">4</span><span class="punctuation">)</span>
<span class="name">d</span> <span class="operator"><-</span> <span class="name function">data.frame</span><span class="punctuation">(</span><span class="name">n</span> <span class="operator">=</span> <span class="name">v</span><span class="punctuation">)</span>
<span class="name">f</span> <span class="operator"><-</span> <span class="name function">function</span><span class="punctuation">(</span><span class="name">a</span><span class="punctuation">)</span> <span class="punctuation">{</span>
<span class="name">g</span> <span class="operator"><-</span> <span class="name function">function </span><span class="punctuation">(</span><span class="name">b</span><span class="punctuation">)</span> <span class="name">a</span> <span class="operator">+</span> <span class="name">b</span>
<span class="name">w</span> <span class="operator"><-</span> <span class="name function">c</span><span class="punctuation">(</span><span class="literal number">1</span><span class="punctuation">,</span> <span class="literal number">2</span><span class="punctuation">)</span>
<span class="name">m</span> <span class="operator"><-</span> <span class="name function">list </span><span class="punctuation">(</span><span class="literal number">3</span><span class="punctuation">,</span> <span class="literal number">4</span><span class="punctuation">)</span>
<span class="name">e</span> <span class="operator"><-</span> <span class="name function">data.frame</span><span class="punctuation">(</span><span class="name">n</span> <span class="operator">=</span> <span class="name">w</span><span class="punctuation">)</span>
<span class="name">L</span> <span class="operator"><-</span> <span class="literal number">2</span>
<span class="punctuation">}</span>
</pre>
<p>"output.tags"
with "--options=NONE --sort=no --fields=+KZ -o - input.r"</p>
<div class="system-message">
<p class="system-message-title">System Message: WARNING/2 (<tt class="docutils">ctags-lang-r.7.rst</tt>, line 68)</p>
<p>Cannot analyze code. No Pygments lexer found for "tags".</p>
<pre class="literal-block">
.. code-block:: tags
G input.r /^G <- 1$/;" globalVar
v input.r /^v <- c(1, 2)$/;" vector
l input.r /^l <- list(3, 4)$/;" list
d input.r /^d <- data.frame(n = v)$/;" dataframe
n input.r /^d <- data.frame(n = v)$/;" nameattr scope:dataframe:d
f input.r /^f <- function(a) {$/;" function
g input.r /^ g <- function (b) a + b$/;" function scope:function:f
w input.r /^ w <- c(1, 2)$/;" vector scope:function:f
m input.r /^ m <- list (3, 4)$/;" list scope:function:f
e input.r /^ e <- data.frame(n = w)$/;" dataframe scope:function:f
n input.r /^ e <- data.frame(n = w)$/;" nameattr scope:dataframe:f.e
L input.r /^ L <- 2$/;" functionVar scope:function:f
</pre>
</div>
<!-- TODO:
- other kinds
- operators for assignment, <-, <<-, ->>, ->, =
- illuminating duplicated tags
- fields (constructor, assignmentop)
- sub parsers -->
</div>
<div class="section" id="see-also">
<h1>SEE ALSO</h1>
<p>ctags(1)</p>
</div>
</div>
</body>
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