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<div class="section" id="module-evennia.commands.cmdparser">
<span id="evennia-commands-cmdparser"></span><h1>evennia.commands.cmdparser<a class="headerlink" href="#module-evennia.commands.cmdparser" title="Permalink to this headline"></a></h1>
<p>The default command parser. Use your own by assigning
<strong>settings.COMMAND_PARSER</strong> to a Python path to a module containing the
replacing cmdparser function. The replacement parser must accept the
same inputs as the default one.</p>
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<dl class="py function">
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<dt id="evennia.commands.cmdparser.create_match">
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<code class="sig-prename descclassname">evennia.commands.cmdparser.</code><code class="sig-name descname">create_match</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">cmdname</span></em>, <em class="sig-param"><span class="n">string</span></em>, <em class="sig-param"><span class="n">cmdobj</span></em>, <em class="sig-param"><span class="n">raw_cmdname</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/evennia/commands/cmdparser.html#create_match"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.commands.cmdparser.create_match" title="Permalink to this definition"></a></dt>
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<dd><p>Builds a command match by splitting the incoming string and
evaluating the quality of the match.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>cmdname</strong> (<em>str</em>) – Name of command to check for.</p></li>
<li><p><strong>string</strong> (<em>str</em>) – The string to match against.</p></li>
<li><p><strong>cmdobj</strong> (<em>str</em>) – The full Command instance.</p></li>
<li><p><strong>raw_cmdname</strong> (<em>str</em><em>, </em><em>optional</em>) – If CMD_IGNORE_PREFIX is set and the cmdname starts with
one of the prefixes to ignore, this contains the raw, unstripped cmdname,
otherwise it is None.</p></li>
</ul>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><p><p><em>match (tuple)</em> –</p>
<dl class="simple">
<dt>This is on the form (cmdname, args, cmdobj, cmdlen, mratio, raw_cmdname),</dt><dd><p>where <strong>cmdname</strong> is the command’s name and <strong>args</strong> is the rest of the incoming
string, without said command name. <strong>cmdobj</strong> is
the Command instance, the cmdlen is the same as len(cmdname) and mratio
is a measure of how big a part of the full input string the cmdname
takes up - an exact match would be 1.0. Finally, the <strong>raw_cmdname</strong> is
the cmdname unmodified by eventual prefix-stripping.</p>
</dd>
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</dd></dl>
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<dl class="py function">
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<dt id="evennia.commands.cmdparser.build_matches">
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<code class="sig-prename descclassname">evennia.commands.cmdparser.</code><code class="sig-name descname">build_matches</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">raw_string</span></em>, <em class="sig-param"><span class="n">cmdset</span></em>, <em class="sig-param"><span class="n">include_prefixes</span><span class="o">=</span><span class="default_value">False</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/evennia/commands/cmdparser.html#build_matches"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.commands.cmdparser.build_matches" title="Permalink to this definition"></a></dt>
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<dd><p>Build match tuples by matching raw_string against available commands.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>raw_string</strong> (<em>str</em>) – Input string that can look in any way; the only assumption is
that the sought command’s name/alias must be <em>first</em> in the string.</p></li>
<li><p><strong>cmdset</strong> (<a class="reference internal" href="evennia.commands.cmdset.html#evennia.commands.cmdset.CmdSet" title="evennia.commands.cmdset.CmdSet"><em>CmdSet</em></a>) – The current cmdset to pick Commands from.</p></li>
<li><p><strong>include_prefixes</strong> (<em>bool</em>) – If set, include prefixes like &#64;, ! etc (specified in settings)
in the match, otherwise strip them before matching.</p></li>
</ul>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><p>matches (list) A list of match tuples created by <strong>cmdparser.create_match</strong>.</p>
</dd>
</dl>
</dd></dl>
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<dl class="py function">
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<dt id="evennia.commands.cmdparser.try_num_prefixes">
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<code class="sig-prename descclassname">evennia.commands.cmdparser.</code><code class="sig-name descname">try_num_prefixes</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">raw_string</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/evennia/commands/cmdparser.html#try_num_prefixes"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.commands.cmdparser.try_num_prefixes" title="Permalink to this definition"></a></dt>
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<dd><p>Test if user tried to separate multi-matches with a number separator
(default 1-name, 2-name etc). This is usually called last, if no other
match was found.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>raw_string</strong> (<em>str</em>) – The user input to parse.</p>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><p><p><em>mindex, new_raw_string (tuple)</em> –</p>
<dl class="simple">
<dt>If a multimatch-separator was detected,</dt><dd><p>this is stripped out as an integer to separate between the matches. The
new_raw_string is the result of stripping out that identifier. If no
such form was found, returns (None, None).</p>
</dd>
</dl>
</p>
</dd>
</dl>
<p class="rubric">Example</p>
<p>In the default configuration, entering 2-ball (e.g. in a room will more
than one ‘ball’ object), will lead to a multimatch and this function
will parse <strong>“2-ball”</strong> and return <strong>(2, “ball”)</strong>.</p>
</dd></dl>
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<dl class="py function">
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<dt id="evennia.commands.cmdparser.cmdparser">
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<code class="sig-prename descclassname">evennia.commands.cmdparser.</code><code class="sig-name descname">cmdparser</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">raw_string</span></em>, <em class="sig-param"><span class="n">cmdset</span></em>, <em class="sig-param"><span class="n">caller</span></em>, <em class="sig-param"><span class="n">match_index</span><span class="o">=</span><span class="default_value">None</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/evennia/commands/cmdparser.html#cmdparser"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.commands.cmdparser.cmdparser" title="Permalink to this definition"></a></dt>
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<dd><p>This function is called by the cmdhandler once it has
gathered and merged all valid cmdsets valid for this particular parsing.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>raw_string</strong> (<em>str</em>) – The unparsed text entered by the caller.</p></li>
<li><p><strong>cmdset</strong> (<a class="reference internal" href="evennia.commands.cmdset.html#evennia.commands.cmdset.CmdSet" title="evennia.commands.cmdset.CmdSet"><em>CmdSet</em></a>) – The merged, currently valid cmdset</p></li>
<li><p><strong>caller</strong> (<a class="reference internal" href="evennia.server.session.html#evennia.server.session.Session" title="evennia.server.session.Session"><em>Session</em></a><em>, </em><em>Account</em><em> or </em><em>Object</em>) – The caller triggering this parsing.</p></li>
<li><p><strong>match_index</strong> (<em>int</em><em>, </em><em>optional</em>) – Index to pick a given match in a
list of same-named command matches. If this is given, it suggests
this is not the first time this function was called: normally
the first run resulted in a multimatch, and the index is given
to select between the results for the second run.</p></li>
</ul>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><p><p><em>matches (list)</em> –</p>
<dl class="simple">
<dt>This is a list of match-tuples as returned by <strong>create_match</strong>.</dt><dd><p>If no matches were found, this is an empty list.</p>
</dd>
</dl>
</p>
</dd>
</dl>
<p class="rubric">Notes</p>
<p>The cmdparser understand the following command combinations (where
[] marks optional parts.</p>
<p>[cmdname[ cmdname2 cmdname3 …] [the rest]</p>
<p>A command may consist of any number of space-separated words of any
length, and contain any character. It may also be empty.</p>
<p>The parser makes use of the cmdset to find command candidates. The
parser return a list of matches. Each match is a tuple with its
first three elements being the parsed cmdname (lower case),
the remaining arguments, and the matched cmdobject from the cmdset.</p>
</dd></dl>
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