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  <section id="ctags-incompatibilities">
<span id="ctags-incompatibilities-7"></span><h1>ctags-incompatibilities<a class="headerlink" href="#ctags-incompatibilities" title="Permalink to this headline"></a></h1>
<p>Incompatibilities between Universal Ctags and Exuberant Ctags</p>
<dl class="field-list simple">
<dt class="field-odd">Version</dt>
<dd class="field-odd"><p>5.9.0</p>
</dd>
<dt class="field-even">Manual group</dt>
<dd class="field-even"><p>Universal Ctags</p>
</dd>
<dt class="field-odd">Manual section</dt>
<dd class="field-odd"><p>7</p>
</dd>
</dl>
<section id="synopsis">
<h2>SYNOPSIS<a class="headerlink" href="#synopsis" title="Permalink to this headline"></a></h2>
<div class="line-block">
<div class="line"><strong>ctags</strong> [options] [file(s)]</div>
<div class="line"><strong>etags</strong> [options] [file(s)]</div>
</div>
</section>
<section id="description">
<h2>DESCRIPTION<a class="headerlink" href="#description" title="Permalink to this headline"></a></h2>
<p>This page describes major incompatible changes introduced to
Universal Ctags forked from Exuberant Ctags.</p>
<section id="option-files-loading-at-starting-up-time-preload-files">
<h3>Option files loading at starting up time (preload files)<a class="headerlink" href="#option-files-loading-at-starting-up-time-preload-files" title="Permalink to this headline"></a></h3>
<p>Universal Ctags doesn’t load <code class="docutils literal notranslate"><span class="pre">~/.ctags</span></code> at starting up time.
File paths for preload files are changed.
See “FILES” section of <a class="reference internal" href="ctags.1.html#ctags-1"><span class="std std-ref">ctags(1)</span></a>.</p>
</section>
<section id="environment-variables-for-arranging-command-lines">
<h3>Environment variables for arranging command lines<a class="headerlink" href="#environment-variables-for-arranging-command-lines" title="Permalink to this headline"></a></h3>
<p>Universal Ctags doesn’t read <code class="docutils literal notranslate"><span class="pre">CTAGS</span></code> and/or <code class="docutils literal notranslate"><span class="pre">ETAGS</span></code> environment
variables.</p>
</section>
<section id="incompatibilities-in-command-line-interface">
<h3>Incompatibilities in command line interface<a class="headerlink" href="#incompatibilities-in-command-line-interface" title="Permalink to this headline"></a></h3>
<section id="ordering-in-a-command-line">
<h4>Ordering in a command line<a class="headerlink" href="#ordering-in-a-command-line" title="Permalink to this headline"></a></h4>
<p>The command line format of Universal Ctags is “<code class="docutils literal notranslate"><span class="pre">ctags</span> <span class="pre">[options]</span>
<span class="pre">[source_file(s)]</span></code>” following the standard POSIX convention.</p>
<p>Exuberant Ctags accepts a option following a source file.</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>ctags -o - foo.c --list-kinds<span class="o">=</span>Sh
<span class="go">f  functions</span>
</pre></div>
</div>
<p>Universal Ctags warns and ignores the option <code class="docutils literal notranslate"><span class="pre">--list-kinds=Sh</span></code> as follows.</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>ctags -o - foo.c --list-kinds<span class="o">=</span>Sh
<span class="go">ctags: Warning: cannot open input file &quot;--list-kinds=Sh&quot; : No such file or directory</span>
<span class="go">a       foo.c   /^void a () {}$/;&quot;      f       typeref:typename:void</span>
<span class="go">b       foo.c   /^void b () {}$/;&quot;      f       typeref:typename:void</span>
</pre></div>
</div>
</section>
<section id="the-order-of-application-of-patterns-and-extensions-in-langmap">
<h4>The order of application of patterns and extensions in <code class="docutils literal notranslate"><span class="pre">--langmap</span></code><a class="headerlink" href="#the-order-of-application-of-patterns-and-extensions-in-langmap" title="Permalink to this headline"></a></h4>
<p>When applying mappings for a name of given source file,
Exuberant Ctags tests file name patterns <em>AFTER</em> file extensions
(<em>e-map-order</em>). Universal Ctags does this differently; it tests file
name patterns <em>BEFORE</em> file extensions (<em>u-map-order</em>).</p>
<p>This incompatible change is introduced to deal with the following
situation:</p>
<blockquote>
<div><ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">build.xml</span></code> as a source file,</p></li>
<li><p>The Ant parser declares it handles a file name pattern <code class="docutils literal notranslate"><span class="pre">build.xml</span></code>, and</p></li>
<li><p>The XML parser declares it handles a file extension <code class="docutils literal notranslate"><span class="pre">.xml</span></code>.</p></li>
</ul>
</div></blockquote>
<p>Which parser should be used for parsing <code class="docutils literal notranslate"><span class="pre">build.xml</span></code>?  The assumption
of Universal Ctags is the user may want to use the Ant parser; the
file name pattern it declares is more specific than the file extension
that the XML parser declares. However, e-map-order chooses the XML
parser.</p>
<p>So Universal Ctags uses the u-map-order even though it introduces an
incompatibility.</p>
<p><code class="docutils literal notranslate"><span class="pre">--list-map-extensions=&lt;language&gt;</span></code> and <code class="docutils literal notranslate"><span class="pre">--list-map-patterns=&lt;language&gt;</span></code>
options are helpful to verify and the file extensions and the file
name patterns of given <em>&lt;language&gt;</em>.</p>
</section>
<section id="remove-file-tags-and-file-scope-options">
<h4>Remove <code class="docutils literal notranslate"><span class="pre">--file-tags</span></code> and <code class="docutils literal notranslate"><span class="pre">--file-scope</span></code> options<a class="headerlink" href="#remove-file-tags-and-file-scope-options" title="Permalink to this headline"></a></h4>
<p>Even in Exuberant Ctags, <code class="docutils literal notranslate"><span class="pre">--file-tags</span></code> is not documented in its man page.
Instead of specifying <code class="docutils literal notranslate"><span class="pre">--file-tags</span></code> or <code class="docutils literal notranslate"><span class="pre">--file-tags=yes</span></code>, use
<code class="docutils literal notranslate"><span class="pre">--extras=+f</span></code> or <code class="docutils literal notranslate"><span class="pre">--extras=+{inputFile}</span></code>.</p>
<p>Instead of specifying <code class="docutils literal notranslate"><span class="pre">--file-tags=no</span></code>, use
<code class="docutils literal notranslate"><span class="pre">--extras=-f</span></code> or <code class="docutils literal notranslate"><span class="pre">--extras=-{inputFile}</span></code>.</p>
<p>Universal Ctags introduces <code class="docutils literal notranslate"><span class="pre">F/fileScope</span></code> extra as the replacement for
<code class="docutils literal notranslate"><span class="pre">--file-scope</span></code> option.</p>
<p>Instead of specifying <code class="docutils literal notranslate"><span class="pre">--file-tags</span></code> or <code class="docutils literal notranslate"><span class="pre">--file-tags=yes</span></code>, use
<code class="docutils literal notranslate"><span class="pre">--extras=+F</span></code> or <code class="docutils literal notranslate"><span class="pre">--extras=+{fileScope}</span></code>.</p>
<p>Instead of specifying <code class="docutils literal notranslate"><span class="pre">--file-tags=no</span></code>, use
<code class="docutils literal notranslate"><span class="pre">--extras=-F</span></code> or <code class="docutils literal notranslate"><span class="pre">--extras=-{fileScope}</span></code>.</p>
</section>
</section>
<section id="incompatibilities-in-language-and-kind-definitions">
<h3>Incompatibilities in language and kind definitions<a class="headerlink" href="#incompatibilities-in-language-and-kind-definitions" title="Permalink to this headline"></a></h3>
<section id="language-name-defined-with-langdef-name-option">
<h4>Language name defined with <code class="docutils literal notranslate"><span class="pre">--langdef=name</span></code> option<a class="headerlink" href="#language-name-defined-with-langdef-name-option" title="Permalink to this headline"></a></h4>
<p>The characters you can use are more restricted than Exuberant Ctags.
For more details, see the description of <code class="docutils literal notranslate"><span class="pre">--langdef=name</span></code> in <a class="reference internal" href="ctags-optlib.7.html#ctags-optlib-7"><span class="std std-ref">ctags-optlib(7)</span></a>.</p>
</section>
<section id="obsoleting-lang-kinds-option">
<h4>Obsoleting <code class="docutils literal notranslate"><span class="pre">--&lt;LANG&gt;-kinds</span></code> option<a class="headerlink" href="#obsoleting-lang-kinds-option" title="Permalink to this headline"></a></h4>
<p>Some options have <em>&lt;LANG&gt;</em> as parameterized parts in their name like
<code class="docutils literal notranslate"><span class="pre">--foo-&lt;LANG&gt;=...</span></code> or <code class="docutils literal notranslate"><span class="pre">--&lt;LANG&gt;-foo=...</span></code>. The most of all such
options in Exuberant Ctags have the former form, <code class="docutils literal notranslate"><span class="pre">--foo-&lt;LANG&gt;=...</span></code>.
The exception is <code class="docutils literal notranslate"><span class="pre">--&lt;LANG&gt;-kinds</span></code>.</p>
<p>Universal Ctags uses the former form for all <em>&lt;LANG&gt;</em> parameterized
option. Use <code class="docutils literal notranslate"><span class="pre">--kinds-&lt;LANG&gt;</span></code> instead of <code class="docutils literal notranslate"><span class="pre">--&lt;LANG&gt;-kinds</span></code> in
Universal Ctags. <code class="docutils literal notranslate"><span class="pre">--&lt;LANG&gt;-kinds</span></code> still works but it will be
removed in the future.</p>
<p>The former form may be friendly to shell completion engines.</p>
</section>
<section id="disallowing-to-define-a-kind-with-file-as-name">
<h4>Disallowing to define a kind with <code class="docutils literal notranslate"><span class="pre">file</span></code> as name<a class="headerlink" href="#disallowing-to-define-a-kind-with-file-as-name" title="Permalink to this headline"></a></h4>
<p>The kind name <code class="docutils literal notranslate"><span class="pre">file</span></code> is reserved.  Using it as part of kind spec in
<code class="docutils literal notranslate"><span class="pre">--regex-&lt;LANG&gt;</span></code> option is now disallowed.</p>
</section>
<section id="disallowing-to-define-a-kind-with-f-as-letter">
<h4>Disallowing to define a kind with ‘<code class="docutils literal notranslate"><span class="pre">F</span></code>’ as letter<a class="headerlink" href="#disallowing-to-define-a-kind-with-f-as-letter" title="Permalink to this headline"></a></h4>
<p>The kind letter ‘<code class="docutils literal notranslate"><span class="pre">F</span></code>’ is reserved.  Using it as part of a kind spec in
<code class="docutils literal notranslate"><span class="pre">--regex-&lt;LANG&gt;</span></code> option is now disallowed.</p>
</section>
<section id="disallowing-to-use-other-than-alphabetical-character-as-kind-letter">
<h4>Disallowing to use other than alphabetical character as kind letter<a class="headerlink" href="#disallowing-to-use-other-than-alphabetical-character-as-kind-letter" title="Permalink to this headline"></a></h4>
<p>Exuberant Ctags accepts a character other than alphabetical character
as kind letter in <code class="docutils literal notranslate"><span class="pre">--regex-&lt;LANG&gt;=...</span></code> option.  Universal Ctags
accepts only an alphabetical character.</p>
</section>
<section id="acceptable-characters-as-parts-of-a-kind-name">
<h4>Acceptable characters as parts of a kind name<a class="headerlink" href="#acceptable-characters-as-parts-of-a-kind-name" title="Permalink to this headline"></a></h4>
<p>Exuberant Ctags accepts any character as a part of a kind name
defined with <code class="docutils literal notranslate"><span class="pre">--regex-&lt;LANG&gt;=/regex/replacement/kind-spec/</span></code>.</p>
<p>Universal Ctags accepts only an alphabetical character as
the initial letter of a kind name.
Universal Ctags accepts only an alphabetical character or
numerical character as the rest letters.</p>
<p>An example:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>--regex-Foo=/abstract +class +([a-z]+)/\1/a,abstract class/i
</pre></div>
</div>
<p>Universal Ctags rejects this because the kind name, <code class="docutils literal notranslate"><span class="pre">abstract</span> <span class="pre">class</span></code>,
includes a whitespace character.</p>
<p>This requirement is for making the output of Universal Ctags follow
the tags file format.</p>
</section>
<section id="a-combination-of-a-kind-letter-and-a-kind-name">
<h4>A combination of a kind letter and a kind name<a class="headerlink" href="#a-combination-of-a-kind-letter-and-a-kind-name" title="Permalink to this headline"></a></h4>
<p>In Universal Ctags, the combination of
a kind letter and a kind name must be unique in a language.</p>
<p>You cannot define more than one kind reusing a kind letter with
different kind names. You cannot define more than one kind reusing a
kind name with different kind letters.</p>
<p>An example:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>--regex-Foo=/abstract +class +([a-z]+)/\1/a,abstractClass/i
--regex-Foo=/attribute +([a-z]+)/\1/a,attribute/i
</pre></div>
</div>
<p>Universal Ctags rejects this because the kind letter, ‘<code class="docutils literal notranslate"><span class="pre">a</span></code>’, used twice
for defining a kind <code class="docutils literal notranslate"><span class="pre">abstractClass</span></code> and <code class="docutils literal notranslate"><span class="pre">attribute</span></code>.</p>
</section>
</section>
<section id="incompatibilities-in-tags-file-format">
<h3>Incompatibilities in tags file format<a class="headerlink" href="#incompatibilities-in-tags-file-format" title="Permalink to this headline"></a></h3>
<section id="using-numerical-character-in-the-name-part-of-tag-tagfield">
<h4>Using numerical character in the name part of tag tagfield<a class="headerlink" href="#using-numerical-character-in-the-name-part-of-tag-tagfield" title="Permalink to this headline"></a></h4>
<p>The version 2 tags file format, the default output format of
Exuberant Ctags, accepts only alphabetical characters in the name part
of tag tagfield.</p>
<p>Universal Ctags introduces an exception to this specification; it may
use numerical characters in addition to alphabetical characters as the
letters other than initial letter of the name part.</p>
<p>The kinds <code class="docutils literal notranslate"><span class="pre">heading1</span></code>, <code class="docutils literal notranslate"><span class="pre">heading2</span></code>, and <code class="docutils literal notranslate"><span class="pre">heading3</span></code> in the HTML parser
are the examples.</p>
</section>
<section id="truncating-the-pattern-for-long-input-lines">
<h4>Truncating the pattern for long input lines<a class="headerlink" href="#truncating-the-pattern-for-long-input-lines" title="Permalink to this headline"></a></h4>
<p>To prevent generating overly large tags files, a pattern field is
truncated, by default, when its size exceeds 96 bytes. A different
limit can be specified with <code class="docutils literal notranslate"><span class="pre">--pattern-length-limit=N</span></code>. Specifying
0 as <em>N</em> results no truncation as Exuberant Ctags does not.</p>
</section>
<section id="kind-letters-and-names">
<h4>Kind letters and names<a class="headerlink" href="#kind-letters-and-names" title="Permalink to this headline"></a></h4>
<p>A kind letter ‘<code class="docutils literal notranslate"><span class="pre">F</span></code>’ and a kind name <code class="docutils literal notranslate"><span class="pre">file</span></code> are reserved in the
main part. A parser cannot have a kind conflicting with
these reserved ones. Some incompatible changes are introduced
to follow the above rule.</p>
<ul class="simple">
<li><p>Cobol’s <code class="docutils literal notranslate"><span class="pre">file</span></code> kind is renamed to <code class="docutils literal notranslate"><span class="pre">fileDesc</span></code> because the
kind name <code class="docutils literal notranslate"><span class="pre">file</span></code> is reserved.</p></li>
<li><p>Ruby’s ‘<code class="docutils literal notranslate"><span class="pre">F</span></code>’ (singletonMethod) is changed to ‘<code class="docutils literal notranslate"><span class="pre">S</span></code>’.</p></li>
<li><p>SQL’s ‘<code class="docutils literal notranslate"><span class="pre">F</span></code>’ (field) is changed to ‘<code class="docutils literal notranslate"><span class="pre">E</span></code>’.</p></li>
</ul>
</section>
</section>
</section>
<section id="see-also">
<h2>SEE ALSO<a class="headerlink" href="#see-also" title="Permalink to this headline"></a></h2>
<p><a class="reference internal" href="ctags.1.html#ctags-1"><span class="std std-ref">ctags(1)</span></a>, <a class="reference internal" href="ctags-optlib.7.html#ctags-optlib-7"><span class="std std-ref">ctags-optlib(7)</span></a>, and <a class="reference internal" href="tags.5.html#tags-5"><span class="std std-ref">tags(5)</span></a>.</p>
</section>
</section>


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  <h3><a href="../index.html">Table of Contents</a></h3>
  <ul>
<li><a class="reference internal" href="#">ctags-incompatibilities</a><ul>
<li><a class="reference internal" href="#synopsis">SYNOPSIS</a></li>
<li><a class="reference internal" href="#description">DESCRIPTION</a><ul>
<li><a class="reference internal" href="#option-files-loading-at-starting-up-time-preload-files">Option files loading at starting up time (preload files)</a></li>
<li><a class="reference internal" href="#environment-variables-for-arranging-command-lines">Environment variables for arranging command lines</a></li>
<li><a class="reference internal" href="#incompatibilities-in-command-line-interface">Incompatibilities in command line interface</a><ul>
<li><a class="reference internal" href="#ordering-in-a-command-line">Ordering in a command line</a></li>
<li><a class="reference internal" href="#the-order-of-application-of-patterns-and-extensions-in-langmap">The order of application of patterns and extensions in <code class="docutils literal notranslate"><span class="pre">--langmap</span></code></a></li>
<li><a class="reference internal" href="#remove-file-tags-and-file-scope-options">Remove <code class="docutils literal notranslate"><span class="pre">--file-tags</span></code> and <code class="docutils literal notranslate"><span class="pre">--file-scope</span></code> options</a></li>
</ul>
</li>
<li><a class="reference internal" href="#incompatibilities-in-language-and-kind-definitions">Incompatibilities in language and kind definitions</a><ul>
<li><a class="reference internal" href="#language-name-defined-with-langdef-name-option">Language name defined with <code class="docutils literal notranslate"><span class="pre">--langdef=name</span></code> option</a></li>
<li><a class="reference internal" href="#obsoleting-lang-kinds-option">Obsoleting <code class="docutils literal notranslate"><span class="pre">--&lt;LANG&gt;-kinds</span></code> option</a></li>
<li><a class="reference internal" href="#disallowing-to-define-a-kind-with-file-as-name">Disallowing to define a kind with <code class="docutils literal notranslate"><span class="pre">file</span></code> as name</a></li>
<li><a class="reference internal" href="#disallowing-to-define-a-kind-with-f-as-letter">Disallowing to define a kind with ‘<code class="docutils literal notranslate"><span class="pre">F</span></code>’ as letter</a></li>
<li><a class="reference internal" href="#disallowing-to-use-other-than-alphabetical-character-as-kind-letter">Disallowing to use other than alphabetical character as kind letter</a></li>
<li><a class="reference internal" href="#acceptable-characters-as-parts-of-a-kind-name">Acceptable characters as parts of a kind name</a></li>
<li><a class="reference internal" href="#a-combination-of-a-kind-letter-and-a-kind-name">A combination of a kind letter and a kind name</a></li>
</ul>
</li>
<li><a class="reference internal" href="#incompatibilities-in-tags-file-format">Incompatibilities in tags file format</a><ul>
<li><a class="reference internal" href="#using-numerical-character-in-the-name-part-of-tag-tagfield">Using numerical character in the name part of tag tagfield</a></li>
<li><a class="reference internal" href="#truncating-the-pattern-for-long-input-lines">Truncating the pattern for long input lines</a></li>
<li><a class="reference internal" href="#kind-letters-and-names">Kind letters and names</a></li>
</ul>
</li>
</ul>
</li>
<li><a class="reference internal" href="#see-also">SEE ALSO</a></li>
</ul>
</li>
</ul>

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