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| author | Indrajith K L | 2022-12-03 17:00:20 +0530 |
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| committer | Indrajith K L | 2022-12-03 17:00:20 +0530 |
| commit | f5c4671bfbad96bf346bd7e9a21fc4317b4959df (patch) | |
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diff --git a/ctags/docs/man/ctags-optlib.7.html b/ctags/docs/man/ctags-optlib.7.html new file mode 100644 index 0000000..0f73ed2 --- /dev/null +++ b/ctags/docs/man/ctags-optlib.7.html @@ -0,0 +1,520 @@ + +<!DOCTYPE html> + +<html> + <head> + <meta charset="utf-8" /> + <meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" /> + + <title>ctags-optlib — Universal Ctags 0.3.0 documentation</title> + <link rel="stylesheet" type="text/css" href="../_static/pygments.css" /> + <link rel="stylesheet" type="text/css" href="../_static/classic.css" /> + + <script data-url_root="../" id="documentation_options" src="../_static/documentation_options.js"></script> + <script src="../_static/jquery.js"></script> + <script src="../_static/underscore.js"></script> + <script src="../_static/doctools.js"></script> + + <link rel="index" title="Index" href="../genindex.html" /> + <link rel="search" title="Search" href="../search.html" /> + <link rel="next" title="ctags-client-tools" href="ctags-client-tools.7.html" /> + <link rel="prev" title="tags" href="tags.5.html" /> + </head><body> + <div class="related" role="navigation" aria-label="related navigation"> + <h3>Navigation</h3> + <ul> + <li class="right" style="margin-right: 10px"> + <a href="../genindex.html" title="General Index" + accesskey="I">index</a></li> + <li class="right" > + <a href="ctags-client-tools.7.html" title="ctags-client-tools" + accesskey="N">next</a> |</li> + <li class="right" > + <a href="tags.5.html" title="tags" + accesskey="P">previous</a> |</li> + <li class="nav-item nav-item-0"><a href="../index.html">Universal Ctags 0.3.0 documentation</a> »</li> + <li class="nav-item nav-item-1"><a href="../man-pages.html" accesskey="U">Man pages</a> »</li> + <li class="nav-item nav-item-this"><a href="">ctags-optlib</a></li> + </ul> + </div> + + <div class="document"> + <div class="documentwrapper"> + <div class="bodywrapper"> + <div class="body" role="main"> + + <section id="ctags-optlib"> +<span id="ctags-optlib-7"></span><h1>ctags-optlib<a class="headerlink" href="#ctags-optlib" title="Permalink to this headline">¶</a></h1> +<p>Universal Ctags parser definition language</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><em>Exuberant Ctags</em>, the ancestor of <em>Universal Ctags</em>, has provided +the way to define a new parser from command line. Universal Ctags +extends and refines this feature. <em>optlib parser</em> is the name for such +parser in Universal Ctags. “opt” intends a parser is defined with +combination of command line options. “lib” intends an optlib parser +can be more than ad-hoc personal configuration.</p> +<p>This man page is for people who want to define an optlib parser. The +readers should read <a class="reference internal" href="ctags.1.html#ctags-1"><span class="std std-ref">ctags(1)</span></a> of Universal Ctags first.</p> +<p>Following options are for defining (or customizing) a parser:</p> +<ul class="simple"> +<li><p><code class="docutils literal notranslate"><span class="pre">--langdef=<name></span></code></p></li> +<li><p><code class="docutils literal notranslate"><span class="pre">--map-<LANG>=[+|-]<extension>|<pattern></span></code></p></li> +<li><p><code class="docutils literal notranslate"><span class="pre">--kinddef-<LANG>=<letter>,<name>,<description></span></code></p></li> +<li><p><code class="docutils literal notranslate"><span class="pre">--regex-<LANG>=/<line_pattern>/<name_pattern>/<kind-spec>/[<flags>]</span></code></p></li> +<li><p><code class="docutils literal notranslate"><span class="pre">--mline-regex-<LANG>=/<line_pattern>/<name_pattern>/<kind-spec>/[<flags>]</span></code></p></li> +</ul> +<p>Following options are for controlling loading parser definition:</p> +<ul class="simple"> +<li><p><code class="docutils literal notranslate"><span class="pre">--options=<pathname></span></code></p></li> +<li><p><code class="docutils literal notranslate"><span class="pre">--options-maybe=<pathname></span></code></p></li> +<li><p><code class="docutils literal notranslate"><span class="pre">--optlib-dir=[+]<directory></span></code></p></li> +</ul> +<p>The design of options and notations for defining a parser in +Exuberant Ctags may focus on reducing the number of typing by user. +Reducing the number of typing is important for users who want to +define (or customize) a parser quickly.</p> +<p>On the other hand, the design in Universal Ctags focuses on +maintainability. The notation of Universal Ctags is redundant than +that of Exuberant Ctags; the newly introduced kind should be declared +explicitly, (long) names are approved than one-letter flags +specifying kinds, and naming rules are stricter.</p> +<p>This man page explains only stable options and flags. Universal Ctags +also introduces experimental options and flags which have names starting +with <code class="docutils literal notranslate"><span class="pre">_</span></code>. For documentation on these options and flags, visit +Universal Ctags web site at <a class="reference external" href="https://ctags.io/">https://ctags.io/</a>.</p> +<section id="storing-a-parser-definition-to-a-file"> +<h3>Storing a parser definition to a file<a class="headerlink" href="#storing-a-parser-definition-to-a-file" title="Permalink to this headline">¶</a></h3> +<p>Though it is possible to define a parser from command line, you don’t +want to type the same command line each time when you need the parser. +You can store options for defining a parser into a file.</p> +<p>ctags loads files (preload files) listed in “FILES” +section of <a class="reference internal" href="ctags.1.html#ctags-1"><span class="std std-ref">ctags(1)</span></a> at program starting up. You can put your parser +definition needed usually to the files.</p> +<p><code class="docutils literal notranslate"><span class="pre">--options=<pathname></span></code>, <code class="docutils literal notranslate"><span class="pre">--options-maybe=<pathname></span></code>, and +<code class="docutils literal notranslate"><span class="pre">--optlib-dir=[+]<directory></span></code> are for loading optlib files you need +occasionally. See “Option File Options” section of <a class="reference internal" href="ctags.1.html#ctags-1"><span class="std std-ref">ctags(1)</span></a> for +these options.</p> +<p>As explained in “FILES” section of <a class="reference internal" href="ctags.1.html#ctags-1"><span class="std std-ref">ctags(1)</span></a>, options for defining a +parser listed line by line in an optlib file. Prefixed white spaces are +ignored. A line starting with ‘#’ is treated as a comment. Escaping +shell meta character is not needed.</p> +<p>Use <code class="docutils literal notranslate"><span class="pre">.ctags</span></code> as file extension for optlib file. You can define +multiple parsers in an optlib file but it is better to make a file for +each parser definition.</p> +<p><code class="docutils literal notranslate"><span class="pre">--_echo=<msg></span></code> and <code class="docutils literal notranslate"><span class="pre">--_force-quit=<num></span></code> options are for debugging +optlib parser.</p> +</section> +<section id="overview-for-defining-a-parser"> +<h3>Overview for defining a parser<a class="headerlink" href="#overview-for-defining-a-parser" title="Permalink to this headline">¶</a></h3> +<ol class="arabic"> +<li><p>Design the parser</p> +<p>You need know both the target language and the ctags’ +concepts (definition, reference, kind, role, field, extra). About +the concepts, <a class="reference internal" href="ctags.1.html#ctags-1"><span class="std std-ref">ctags(1)</span></a> of Universal Ctags may help you.</p> +</li> +<li><p>Give a name to the parser</p> +<p>Use <code class="docutils literal notranslate"><span class="pre">--langdef=<name></span></code> option. <em><name></em> is referred as <em><LANG></em> in +the later steps.</p> +</li> +<li><p>Give a file pattern or file extension for activating the parser</p> +<p>Use <code class="docutils literal notranslate"><span class="pre">--map-<LANG>=[+|-]<extension>|<pattern></span></code>.</p> +</li> +<li><p>Define kinds</p> +<p>Use <code class="docutils literal notranslate"><span class="pre">--kinddef-<LANG>=<letter>,<name>,<description></span></code> option. +Universal Ctags introduces this option. Exuberant Ctags doesn’t +have. In Exuberant Ctags, a kind is defined as a side effect of +specifying <code class="docutils literal notranslate"><span class="pre">--regex-<LANG>=</span></code> option. So user doesn’t have a +chance to recognize how important the definition of kind.</p> +</li> +<li><p>Define patterns</p> +<p>Use <code class="docutils literal notranslate"><span class="pre">--regex-<LANG>=/<line_pattern>/<name_pattern>/<kind-spec>/[<flags>]</span></code> +option for a single-line regular expression. You can also use +<code class="docutils literal notranslate"><span class="pre">--mline-regex-<LANG>=/<line_pattern>/<name_pattern>/<kind-spec>/[<flags>]</span></code> +option for a multi-line regular expression.</p> +<p>As <em><kind-spec></em>, you can use the one-letter flag defined with +<code class="docutils literal notranslate"><span class="pre">--kinddef-<LANG>=<letter>,<name>,<description></span></code> option.</p> +</li> +</ol> +</section> +</section> +<section id="options"> +<h2>OPTIONS<a class="headerlink" href="#options" title="Permalink to this headline">¶</a></h2> +<dl> +<dt><code class="docutils literal notranslate"><span class="pre">--langdef=<name></span></code></dt><dd><p>Defines a new user-defined language, <em><name></em>, to be parsed with regular +expressions. Once defined, <em><name></em> may be used in other options taking +language names.</p> +<p><em><name></em> must consist of alphanumeric characters, ‘<code class="docutils literal notranslate"><span class="pre">#</span></code>’, or ‘<code class="docutils literal notranslate"><span class="pre">+</span></code>’ +(‘[a-zA-Z0-9#+]+’). The graph characters other than ‘<code class="docutils literal notranslate"><span class="pre">#</span></code>’ and +‘<code class="docutils literal notranslate"><span class="pre">+</span></code>’ are disallowed (or reserved). Some of them (<code class="docutils literal notranslate"><span class="pre">[-=:{.]</span></code>) are +disallowed because they can make the command line parser of +ctags confused. The rest of them are just +reserved for future extending ctags.</p> +<p><code class="docutils literal notranslate"><span class="pre">all</span></code> is an exception. <code class="docutils literal notranslate"><span class="pre">all</span></code> as <em><name></em> is not acceptable. It is +a reserved word. See the description of +<code class="docutils literal notranslate"><span class="pre">--kinds-(<LANG>|all)=[+|-](<kinds>|*)</span></code> option in <a class="reference internal" href="ctags.1.html#ctags-1"><span class="std std-ref">ctags(1)</span></a> about how the +reserved word is used.</p> +<p>The names of built-in parsers are capitalized. When +ctags evaluates an option in a command line, and +chooses a parser, ctags uses the names of +parsers in a case-insensitive way. Therefore, giving a name +started from a lowercase character doesn’t help you to avoid the +parser name confliction. However, in a tags file, +ctags prints parser names in a case-sensitive +way; it prints a parser name as specified in <code class="docutils literal notranslate"><span class="pre">--langdef=<name></span></code> +option. Therefore, we recommend you to give a name started from a +lowercase character to your private optlib parser. With this +convention, people can know where a tag entry in a tag file comes +from a built-in parser or a private optlib parser.</p> +</dd> +<dt><code class="docutils literal notranslate"><span class="pre">--kinddef-<LANG>=<letter>,<name>,<description></span></code></dt><dd><p>Define a kind for <em><LANG></em>. +Be not confused this with <code class="docutils literal notranslate"><span class="pre">--kinds-<LANG></span></code>.</p> +<p><em><letter></em> must be an alphabetical character (‘[a-zA-EG-Z]’) +other than “F”. “F” has been reserved for representing a file +since Exuberant Ctags.</p> +<p><em><name></em> must start with an alphabetic character, and the rest +must be alphanumeric (‘[a-zA-Z][a-zA-Z0-9]*’). Do not use +“file” as <em><name></em>. It has been reserved for representing a file +since Exuberant Ctags.</p> +<p>Note that using a number character in a <em><name></em> violates the +version 2 of tags file format though ctags +accepts it. For more detail, see <a class="reference internal" href="tags.5.html#tags-5"><span class="std std-ref">tags(5)</span></a>.</p> +<p><em><description></em> comes from any printable ASCII characters. The +exception is <code class="docutils literal notranslate"><span class="pre">{</span></code> and <code class="docutils literal notranslate"><span class="pre">\</span></code>. <code class="docutils literal notranslate"><span class="pre">{</span></code> is reserved for adding flags +this option in the future. So put <code class="docutils literal notranslate"><span class="pre">\</span></code> before <code class="docutils literal notranslate"><span class="pre">{</span></code> to include +<code class="docutils literal notranslate"><span class="pre">{</span></code> to a description. To include <code class="docutils literal notranslate"><span class="pre">\</span></code> itself to a description, +put <code class="docutils literal notranslate"><span class="pre">\</span></code> before <code class="docutils literal notranslate"><span class="pre">\</span></code>.</p> +<p>Both <em><letter></em>, <em><name></em> and their combination must be unique in +a <em><LANG></em>.</p> +<p>This option is newly introduced in Universal Ctags. This option +reduces the typing defining a regex pattern with +<code class="docutils literal notranslate"><span class="pre">--regex-<LANG>=</span></code>, and keeps the consistency of kind +definitions in a language.</p> +<p>The <em><letter></em> can be used as an argument for <code class="docutils literal notranslate"><span class="pre">--kinds-<LANG></span></code> +option to enable or disable the kind. Unless <code class="docutils literal notranslate"><span class="pre">K</span></code> field is +enabled, the <em><letter></em> is used as value in the “kind” extension +field in tags output.</p> +<p>The <em><name></em> surrounded by braces can be used as an argument for +<code class="docutils literal notranslate"><span class="pre">--kind-<LANG></span></code> option. If <code class="docutils literal notranslate"><span class="pre">K</span></code> field is enabled, the <em><name></em> +is used as value in the “kind” extension field in tags output.</p> +<p>The <em><description></em> and <em><letter></em> are listed in <code class="docutils literal notranslate"><span class="pre">--list-kinds</span></code> +output. All three elements of the kind-spec are listed in +<code class="docutils literal notranslate"><span class="pre">--list-kinds-full</span></code> output. Don’t use braces in the +<em><description></em>. They will be used meta characters in the future.</p> +</dd> +<dt><code class="docutils literal notranslate"><span class="pre">--regex-<LANG>=/<line_pattern>/<name_pattern>/<kind-spec>/[<flags>]</span></code></dt><dd><p>Define a single-line regular expression.</p> +<p>The <em>/<line_pattern>/<name_pattern>/</em> pair defines a regular expression +replacement pattern, similar in style to <code class="docutils literal notranslate"><span class="pre">sed</span></code> substitution +commands, <code class="docutils literal notranslate"><span class="pre">s/regexp/replacement/</span></code>, with which to generate tags from source files mapped to +the named language, <em><LANG></em>, (case-insensitive; either a built-in +or user-defined language).</p> +<p>The regular expression, <em><line_pattern></em>, defines +an extended regular expression (roughly that used by egrep(1)), +which is used to locate a single source line containing a tag and +may specify tab characters using <code class="docutils literal notranslate"><span class="pre">\t</span></code>.</p> +<p>When a matching line is +found, a tag will be generated for the name defined by +<em><name_pattern></em>, which generally will contain the special +back-references <code class="docutils literal notranslate"><span class="pre">\1</span></code> through <code class="docutils literal notranslate"><span class="pre">\9</span></code> to refer to matching sub-expression +groups within <em><line_pattern></em>.</p> +<p>The ‘<code class="docutils literal notranslate"><span class="pre">/</span></code>’ separator characters shown in the +parameter to the option can actually be replaced by any +character. Note that whichever separator character is used will +have to be escaped with a backslash (’<code class="docutils literal notranslate"><span class="pre">\</span></code>’) character wherever it is +used in the parameter as something other than a separator. The +regular expression defined by this option is added to the current +list of regular expressions for the specified language unless the +parameter is omitted, in which case the current list is cleared.</p> +<p>Unless modified by <em><flags></em>, <em><line_pattern></em> is interpreted as a POSIX +extended regular expression. The <em><name_pattern></em> should expand for all +matching lines to a non-empty string of characters, or a warning +message will be reported unless <code class="docutils literal notranslate"><span class="pre">{placeholder}</span></code> regex flag is +specified.</p> +<p>A kind specifier (<em><kind-spec></em>) for tags matching regexp may +follow <em><name_pattern></em>, which will determine what kind of tag is +reported in the <code class="docutils literal notranslate"><span class="pre">kind</span></code> extension field (see <a class="reference internal" href="tags.5.html#tags-5"><span class="std std-ref">tags(5)</span></a>).</p> +<p><em><kind-spec></em> has two forms: <em>one-letter form</em> and <em>full form</em>.</p> +<p>The one-letter form in the form of <code class="docutils literal notranslate"><span class="pre"><letter></span></code>. It just refers a kind +<em><letter></em> defined with <code class="docutils literal notranslate"><span class="pre">--kinddef-<LANG></span></code>. This form is recommended in +Universal Ctags.</p> +<p>The full form of <em><kind-spec></em> is in the form of +<code class="docutils literal notranslate"><span class="pre"><letter>,<name>,<description></span></code>. Either the kind <em><name></em> and/or the +<em><description></em> can be omitted. See the description of +<code class="docutils literal notranslate"><span class="pre">--kinddef-<LANG>=<letter>,<name>,<description></span></code> option about the +elements.</p> +<p>The full form is supported only for keeping the compatibility with Exuberant +Ctags which does not have <code class="docutils literal notranslate"><span class="pre">--kinddef-<LANG></span></code> option. Supporting the +form will be removed from Universal Ctags in the future.</p> +<p>About <em><flags></em>, see “FLAGS FOR <code class="docutils literal notranslate"><span class="pre">--regex-<LANG></span></code> OPTION”.</p> +<p>For more information on the regular expressions used by +ctags, see either the regex(5,7) man page, or +the GNU info documentation for regex (e.g. “<code class="docutils literal notranslate"><span class="pre">info</span> <span class="pre">regex</span></code>”).</p> +</dd> +<dt><code class="docutils literal notranslate"><span class="pre">--list-regex-flags</span></code></dt><dd><p>Lists the flags that can be used in <code class="docutils literal notranslate"><span class="pre">--regex-<LANG></span></code> option.</p> +</dd> +<dt><code class="docutils literal notranslate"><span class="pre">--list-mline-regex-flags</span></code></dt><dd><p>Lists the flags that can be used in <code class="docutils literal notranslate"><span class="pre">--mline-regex-<LANG></span></code> option.</p> +</dd> +<dt><code class="docutils literal notranslate"><span class="pre">--mline-regex-<LANG>=/<line_pattern>/<name_pattern>/<kind-spec>/[<flags>]</span></code></dt><dd><p>Define a multi-line regular expression.</p> +<p>This option is similar to <code class="docutils literal notranslate"><span class="pre">--regex-<LANG></span></code> option except the pattern is +applied to the whole file’s contents, not line by line.</p> +</dd> +<dt><code class="docutils literal notranslate"><span class="pre">--_echo=<message></span></code></dt><dd><p>Print <em><message></em> to the standard error stream. This is helpful to +understand (and debug) optlib loading feature of Universal Ctags.</p> +</dd> +<dt><code class="docutils literal notranslate"><span class="pre">--_force-quit[=<num>]</span></code></dt><dd><p>Exits immediately when this option is processed. If <em><num></em> is used +as exit status. The default is 0. This is helpful to debug optlib +loading feature of Universal Ctags.</p> +</dd> +</dl> +<section id="flags-for-regex-lang-option"> +<h3>FLAGS FOR <code class="docutils literal notranslate"><span class="pre">--regex-<LANG></span></code> OPTION<a class="headerlink" href="#flags-for-regex-lang-option" title="Permalink to this headline">¶</a></h3> +<p>You can specify more than one flag, <code class="docutils literal notranslate"><span class="pre"><letter>|{<name>}</span></code>, at the end of <code class="docutils literal notranslate"><span class="pre">--regex-<LANG></span></code> to +control how Universal Ctags uses the pattern.</p> +<p>Exuberant Ctags uses a <em><letter></em> to represent a flag. In +Universal Ctags, a <em><name></em> surrounded by braces (name form) can be used +in addition to <em><letter></em>. The name form makes a user reading an optlib +file easier.</p> +<p>The most of all flags newly added in Universal Ctags +don’t have the one-letter representation. All of them have only the name +representation. <code class="docutils literal notranslate"><span class="pre">--list-regex-flags</span></code> lists all the flags.</p> +<dl class="simple"> +<dt><code class="docutils literal notranslate"><span class="pre">basic</span></code> (one-letter form <code class="docutils literal notranslate"><span class="pre">b</span></code>)</dt><dd><p>The pattern is interpreted as a POSIX basic regular expression.</p> +</dd> +<dt><code class="docutils literal notranslate"><span class="pre">exclusive</span></code> (one-letter form <code class="docutils literal notranslate"><span class="pre">x</span></code>)</dt><dd><p>Skip testing the other patterns if a line is matched to this +pattern. This is useful to avoid using CPU to parse line comments.</p> +</dd> +<dt><code class="docutils literal notranslate"><span class="pre">extend</span></code> (one-letter form <code class="docutils literal notranslate"><span class="pre">e</span></code>)</dt><dd><p>The pattern is interpreted as a POSIX extended regular +expression (default).</p> +</dd> +<dt><code class="docutils literal notranslate"><span class="pre">icase</span></code> (one-letter form <code class="docutils literal notranslate"><span class="pre">i</span></code>)</dt><dd><p>The regular expression is to be applied in a case-insensitive +manner.</p> +</dd> +<dt><code class="docutils literal notranslate"><span class="pre">placeholder</span></code></dt><dd><p>Don’t emit a tag captured with a regex pattern. The replacement +can be an empty string. See the following description of +<code class="docutils literal notranslate"><span class="pre">scope=...</span></code> flag about how this is useful.</p> +</dd> +</dl> +<p><code class="docutils literal notranslate"><span class="pre">scope=(ref|push|pop|clear|set)</span></code></p> +<blockquote> +<div><p>Specify what to do with the internal scope stack.</p> +<p>A parser programmed with <code class="docutils literal notranslate"><span class="pre">--regex-<LANG></span></code> has a stack (scope +stack) internally. You can use it for tracking scope +information. The <code class="docutils literal notranslate"><span class="pre">scope=...</span></code> flag is for manipulating and +utilizing the scope stack.</p> +<p>If <code class="docutils literal notranslate"><span class="pre">{scope=push}</span></code> is specified, a tag captured with +<code class="docutils literal notranslate"><span class="pre">--regex-<LANG></span></code> is pushed to the stack. <code class="docutils literal notranslate"><span class="pre">{scope=push}</span></code> +implies <code class="docutils literal notranslate"><span class="pre">{scope=ref}</span></code>.</p> +<p>You can fill the scope field of captured tag with +<code class="docutils literal notranslate"><span class="pre">{scope=ref}</span></code>. If <code class="docutils literal notranslate"><span class="pre">{scope=ref}</span></code> flag is given, +ctags attaches the tag at the top to the tag +captured with <code class="docutils literal notranslate"><span class="pre">--regex-<LANG></span></code> as the value for the <code class="docutils literal notranslate"><span class="pre">scope:</span></code> +field.</p> +<p>ctags pops the tag at the top of the stack when +<code class="docutils literal notranslate"><span class="pre">--regex-<LANG></span></code> with <code class="docutils literal notranslate"><span class="pre">{scope=pop}</span></code> is matched to the input +line.</p> +<p>Specifying <code class="docutils literal notranslate"><span class="pre">{scope=clear}</span></code> removes all the tags in the scope. +Specifying <code class="docutils literal notranslate"><span class="pre">{scope=set}</span></code> removes all the tags in the scope, and +then pushes the captured tag as <code class="docutils literal notranslate"><span class="pre">{scope=push}</span></code> does.</p> +<p>In some cases, you may want to use <code class="docutils literal notranslate"><span class="pre">--regex-<LANG></span></code> only for its +side effects: using it only to manipulate the stack but not for +capturing a tag. In such a case, make <em><name_pattern></em> component of +<code class="docutils literal notranslate"><span class="pre">--regex-<LANG></span></code> option empty while specifying <code class="docutils literal notranslate"><span class="pre">{placeholder}</span></code> +as a regex flag. For example, a non-named tag can be put on +the stack by giving a regex flag “<code class="docutils literal notranslate"><span class="pre">{scope=push}{placeholder}</span></code>”.</p> +<p>You may wonder what happens if a regex pattern with +<code class="docutils literal notranslate"><span class="pre">{scope=ref}</span></code> flag matches an input line but the stack is empty, +or a non-named tag is at the top. If the regex pattern contains a +<code class="docutils literal notranslate"><span class="pre">{scope=ref}</span></code> flag and the stack is empty, the <code class="docutils literal notranslate"><span class="pre">{scope=ref}</span></code> +flag is ignored and nothing is attached to the <code class="docutils literal notranslate"><span class="pre">scope:</span></code> field.</p> +<p>If the top of the stack contains an unnamed tag, +ctags searches deeper into the stack to find the +top-most named tag. If it reaches the bottom of the stack without +finding a named tag, the <code class="docutils literal notranslate"><span class="pre">{scope=ref}</span></code> flag is ignored and +nothing is attached to the <code class="docutils literal notranslate"><span class="pre">scope:</span></code> field.</p> +<p>When a named tag on the stack is popped or cleared as the side +effect of a pattern matching, ctags attaches the +line number of the match to the <code class="docutils literal notranslate"><span class="pre">end:</span></code> field of +the named tag.</p> +<p>ctags clears all of the tags on the stack when it +reaches the end of the input source file. The line number of the +end is attached to the <code class="docutils literal notranslate"><span class="pre">end:</span></code> field of the cleared tags.</p> +</div></blockquote> +<dl class="simple"> +<dt><code class="docutils literal notranslate"><span class="pre">warning=<message></span></code></dt><dd><p>print the given <em><message></em> at WARNING level</p> +</dd> +<dt><code class="docutils literal notranslate"><span class="pre">fatal=<message></span></code></dt><dd><p>print the given <em><message></em> and exit</p> +</dd> +</dl> +</section> +</section> +<section id="examples"> +<h2>EXAMPLES<a class="headerlink" href="#examples" title="Permalink to this headline">¶</a></h2> +<section id="perl-pod"> +<h3>Perl Pod<a class="headerlink" href="#perl-pod" title="Permalink to this headline">¶</a></h3> +<p>This is the definition (pod.ctags) used in ctags for parsing Pod +(<a class="reference external" href="https://perldoc.perl.org/perlpod.html">https://perldoc.perl.org/perlpod.html</a>) file.</p> +<div class="highlight-ctags notranslate"><div class="highlight"><pre><span></span><span class="kn">--langdef</span><span class="p">=</span><span class="nn">pod</span> +<span class="kd">--map-</span><span class="nn">pod</span><span class="p">=+</span>.pod + +<span class="kd">--kinddef-</span><span class="nn">pod</span><span class="p">=</span><span class="ni">c</span><span class="p">,</span><span class="ni">chapter</span><span class="p">,</span><span class="sd">chapters</span> +<span class="kd">--kinddef-</span><span class="nn">pod</span><span class="p">=</span><span class="ni">s</span><span class="p">,</span><span class="ni">section</span><span class="p">,</span><span class="sd">sections</span> +<span class="kd">--kinddef-</span><span class="nn">pod</span><span class="p">=</span><span class="ni">S</span><span class="p">,</span><span class="ni">subsection</span><span class="p">,</span><span class="sd">subsections</span> +<span class="kd">--kinddef-</span><span class="nn">pod</span><span class="p">=</span><span class="ni">t</span><span class="p">,</span><span class="ni">subsubsection</span><span class="p">,</span><span class="sd">subsubsections</span> + +<span class="kd">--regex-</span><span class="nn">pod</span><span class="p">=</span>/^=head1[ \t]+(.+)/\1/c/ +<span class="kd">--regex-</span><span class="nn">pod</span><span class="p">=</span>/^=head2[ \t]+(.+)/\1/s/ +<span class="kd">--regex-</span><span class="nn">pod</span><span class="p">=</span>/^=head3[ \t]+(.+)/\1/S/ +<span class="kd">--regex-</span><span class="nn">pod</span><span class="p">=</span>/^=head4[ \t]+(.+)/\1/t/ +</pre></div> +</div> +</section> +<section id="using-scope-regex-flags"> +<h3>Using scope regex flags<a class="headerlink" href="#using-scope-regex-flags" title="Permalink to this headline">¶</a></h3> +<p>Let’s think about writing a parser for a very small subset of the Ruby +language.</p> +<p>input source file (<code class="docutils literal notranslate"><span class="pre">input.srb</span></code>):</p> +<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">Example</span> + <span class="k">def</span> <span class="nf">methodA</span> + <span class="n">puts</span> <span class="s2">"in class_method"</span> + <span class="n">end</span> + <span class="k">def</span> <span class="nf">methodB</span> + <span class="n">puts</span> <span class="s2">"in class_method"</span> + <span class="n">end</span> +<span class="n">end</span> +</pre></div> +</div> +<p>The parser for the input should capture <code class="docutils literal notranslate"><span class="pre">Example</span></code> with <code class="docutils literal notranslate"><span class="pre">class</span></code> kind, +<code class="docutils literal notranslate"><span class="pre">methodA</span></code>, and <code class="docutils literal notranslate"><span class="pre">methodB</span></code> with <code class="docutils literal notranslate"><span class="pre">method</span></code> kind. <code class="docutils literal notranslate"><span class="pre">methodA</span></code> and <code class="docutils literal notranslate"><span class="pre">methodB</span></code> +should have <code class="docutils literal notranslate"><span class="pre">Example</span></code> as their scope. <code class="docutils literal notranslate"><span class="pre">end:</span></code> fields of each tag +should have proper values.</p> +<p>optlib file (<code class="docutils literal notranslate"><span class="pre">sub-ruby.ctags</span></code>):</p> +<div class="highlight-ctags notranslate"><div class="highlight"><pre><span></span><span class="kn">--langdef</span><span class="p">=</span><span class="nn">subRuby</span> +<span class="kd">--map-</span><span class="nn">subRuby</span><span class="p">=</span>.srb +<span class="kd">--kinddef-</span><span class="nn">subRuby</span><span class="p">=</span><span class="ni">c</span><span class="p">,</span><span class="ni">class</span><span class="p">,</span><span class="sd">classes</span> +<span class="kd">--kinddef-</span><span class="nn">subRuby</span><span class="p">=</span><span class="ni">m</span><span class="p">,</span><span class="ni">method</span><span class="p">,</span><span class="sd">methods</span> +<span class="kd">--regex-</span><span class="nn">subRuby</span><span class="p">=</span>/^class[ \t]+([a-zA-Z][a-zA-Z0-9]+)/\1/c/{scope=push} +<span class="kd">--regex-</span><span class="nn">subRuby</span><span class="p">=</span>/^end///{scope=pop}{placeholder} +<span class="kd">--regex-</span><span class="nn">subRuby</span><span class="p">=</span>/^[ \t]+def[ \t]+([a-zA-Z][a-zA-Z0-9_]+)/\1/m/{scope=push} +<span class="kd">--regex-</span><span class="nn">subRuby</span><span class="p">=</span>/^[ \t]+end///{scope=pop}{placeholder} +</pre></div> +</div> +<p>command line and output:</p> +<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ ctags --quiet --fields=+eK \ +--options=./sub-ruby.ctags -o - input.srb +Example input.srb /^class Example$/;" class end:8 +methodA input.srb /^ def methodA$/;" method class:Example end:4 +methodB input.srb /^ def methodB$/;" method class:Example end:7 +</pre></div> +</div> +</section> +</section> +<section id="see-also"> +<h2>SEE ALSO<a class="headerlink" href="#see-also" title="Permalink to this headline">¶</a></h2> +<p>The official Universal Ctags web site at:</p> +<p><a class="reference external" href="https://ctags.io/">https://ctags.io/</a></p> +<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="tags.5.html#tags-5"><span class="std std-ref">tags(5)</span></a>, regex(3), regex(7), egrep(1)</p> +</section> +<section id="author"> +<h2>AUTHOR<a class="headerlink" href="#author" title="Permalink to this headline">¶</a></h2> +<p>Universal Ctags project +<a class="reference external" href="https://ctags.io/">https://ctags.io/</a> +(This man page partially derived from <a class="reference internal" href="ctags.1.html#ctags-1"><span class="std std-ref">ctags(1)</span></a> of +Executable-ctags)</p> +<p>Darren Hiebert <<a class="reference external" href="mailto:dhiebert%40users.sourceforge.net">dhiebert<span>@</span>users<span>.</span>sourceforge<span>.</span>net</a>> +<a class="reference external" href="http://DarrenHiebert.com/">http://DarrenHiebert.com/</a></p> +</section> +</section> + + + <div class="clearer"></div> + </div> + </div> + </div> + <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> + <div class="sphinxsidebarwrapper"> + <h3><a href="../index.html">Table of Contents</a></h3> + <ul> +<li><a class="reference internal" href="#">ctags-optlib</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="#storing-a-parser-definition-to-a-file">Storing a parser definition to a file</a></li> +<li><a class="reference internal" href="#overview-for-defining-a-parser">Overview for defining a parser</a></li> +</ul> +</li> +<li><a class="reference internal" href="#options">OPTIONS</a><ul> +<li><a class="reference internal" href="#flags-for-regex-lang-option">FLAGS FOR <code class="docutils literal notranslate"><span class="pre">--regex-<LANG></span></code> OPTION</a></li> +</ul> +</li> +<li><a class="reference internal" href="#examples">EXAMPLES</a><ul> +<li><a class="reference internal" href="#perl-pod">Perl Pod</a></li> +<li><a class="reference internal" href="#using-scope-regex-flags">Using scope regex flags</a></li> +</ul> +</li> +<li><a class="reference internal" href="#see-also">SEE ALSO</a></li> +<li><a class="reference internal" href="#author">AUTHOR</a></li> +</ul> +</li> +</ul> + + <h4>Previous topic</h4> + <p class="topless"><a href="tags.5.html" + title="previous 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class="nav-item nav-item-0"><a href="../index.html">Universal Ctags 0.3.0 documentation</a> »</li> + <li class="nav-item nav-item-1"><a href="../man-pages.html" >Man pages</a> »</li> + <li class="nav-item nav-item-this"><a href="">ctags-optlib</a></li> + </ul> + </div> + <div class="footer" role="contentinfo"> + © Copyright 2015, Universal Ctags Team. + Last updated on 11 Jun 2021. + Created using <a href="https://www.sphinx-doc.org/">Sphinx</a> 4.0.2. + </div> + </body> +</html>
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