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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>txexpr: Tagged X-expressions</title><link rel="stylesheet" type="text/css" href="scribble.css" title="default"/><link rel="stylesheet" type="text/css" href="racket.css" title="default"/><link rel="stylesheet" type="text/css" href="manual-style.css" title="default"/><link rel="stylesheet" type="text/css" href="manual-racket.css" title="default"/><script type="text/javascript" src="scribble-common.js"></script><script type="text/javascript" src="manual-racket.js"></script><!--[if IE 6]><style type="text/css">.SIEHidden { overflow: hidden; }</style><![endif]--></head><body id="scribble-racket-lang-org"><div class="tocset"><div class="tocview"><div class="tocviewlist tocviewlisttopspace"><div class="tocviewtitle"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,&quot;tocview_0&quot;);">&#9658;</a></td><td></td><td><a href="index.html" class="tocviewselflink" data-pltdoc="x">txexpr:<span class="mywbr"> &nbsp;</span> Tagged X-<wbr></wbr>expressions</a></td></tr></table></div><div class="tocviewsublistonly" style="display: none;" id="tocview_0"><table cellspacing="0" cellpadding="0"><tr><td align="right">1&nbsp;</td><td><a href="index.html#%28part._.Installation%29" class="tocviewlink" data-pltdoc="x">Installation</a></td></tr><tr><td align="right">2&nbsp;</td><td><a href="index.html#%28part._.Importing_the_module%29" class="tocviewlink" data-pltdoc="x">Importing the module</a></td></tr><tr><td align="right">3&nbsp;</td><td><a href="index.html#%28part._.What_s_a_txexpr_%29" class="tocviewlink" data-pltdoc="x">What&#8217;s a txexpr?</a></td></tr><tr><td align="right">4&nbsp;</td><td><a href="index.html#%28part._.Why_not_just_use_match__quasiquote__and_so_on_%29" class="tocviewlink" data-pltdoc="x">Why not just use <span class="stt">match</span>, <span class="stt">quasiquote</span>, and so on?</a></td></tr><tr><td align="right">5&nbsp;</td><td><a href="index.html#%28part._.Interface%29" class="tocviewlink" data-pltdoc="x">Interface</a></td></tr><tr><td align="right">6&nbsp;</td><td><a href="index.html#%28part._.License___source_code%29" class="tocviewlink" data-pltdoc="x">License &amp; source code</a></td></tr></table></div></div></div><div class="tocsub"><table class="tocsublist" cellspacing="0"><tr><td><span class="tocsublinknumber"></span><a href="#%28part._txexpr__.Tagged_.X-expressions%29" class="tocsubseclink" data-pltdoc="x">txexpr:<span class="mywbr"> &nbsp;</span> Tagged X-<wbr></wbr>expressions</a></td></tr><tr><td><span class="tocsublinknumber">1<tt>&nbsp;</tt></span><a href="#%28part._.Installation%29" class="tocsubseclink" data-pltdoc="x">Installation</a></td></tr><tr><td><span class="tocsublinknumber">2<tt>&nbsp;</tt></span><a href="#%28part._.Importing_the_module%29" class="tocsubseclink" data-pltdoc="x">Importing the module</a></td></tr><tr><td><span class="tocsublinknumber">3<tt>&nbsp;</tt></span><a href="#%28part._.What_s_a_txexpr_%29" class="tocsubseclink" data-pltdoc="x">What&#8217;s a txexpr?</a></td></tr><tr><td><span class="tocsublinknumber">4<tt>&nbsp;</tt></span><a href="#%28part._.Why_not_just_use_match__quasiquote__and_so_on_%29" class="tocsubseclink" data-pltdoc="x">Why not just use <span class="stt">match</span>, <span class="stt">quasiquote</span>, and so on?</a></td></tr><tr><td><span class="tocsublinknumber">5<tt>&nbsp;</tt></span><a href="#%28part._.Interface%29" class="tocsubseclink" data-pltdoc="x">Interface</a></td></tr><tr><td><a href="#%28def._%28%28lib._txexpr%2Fmain..rkt%29._txexpr~3f%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">txexpr?</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._txexpr%2Fmain..rkt%29._txexpr-tag~3f%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">txexpr-<wbr></wbr>tag?</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._txexpr%2Fmain..rkt%29._
</div><div class="SIntrapara"><table cellspacing="0"><tr><td><p><span class="stt">raco pkg install txexpr</span></p></td></tr></table></div></p><p><div class="SIntrapara">After that, you can update the package from the command line:
</div><div class="SIntrapara"><table cellspacing="0"><tr><td><p><span class="stt">raco pkg update txexpr</span></p></td></tr></table></div></p><h3>2<tt>&nbsp;</tt><a name="(part._.Importing_the_module)"></a>Importing the module</h3><p>The module operates in two modes: fast and safe. Fast mode is the default, which you get by importing the module in the usual way: <span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/reference/require.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._require%29%29" class="RktStxLink" data-pltdoc="x">require</a></span><span class="RktMeta"></span><span class="hspace">&nbsp;</span><span class="RktMeta"></span><span class="RktSym">txexpr</span><span class="RktPn">)</span><span class="RktMeta"></span>.</p><p>Safe mode enables the function contracts documented below. Use safe mode by importing the module as <span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/reference/require.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._require%29%29" class="RktStxLink" data-pltdoc="x">require</a></span><span class="RktMeta"></span><span class="hspace">&nbsp;</span><span class="RktMeta"></span><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/reference/require.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._submod%29%29" class="RktStxLink" data-pltdoc="x">submod</a></span><span class="RktMeta"></span><span class="hspace">&nbsp;</span><span class="RktMeta"></span><span class="RktSym">txexpr</span><span class="RktMeta"></span><span class="hspace">&nbsp;</span><span class="RktMeta"></span><span class="RktSym">safe</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktMeta"></span>.</p><h3>3<tt>&nbsp;</tt><a name="(part._.What_s_a_txexpr_)"></a>What&#8217;s a txexpr?</h3><p>It&rsquo;s an X-expression with the following grammar:</p><p><table cellspacing="0"><tr><td align="right" valign="baseline"><span class="hspace">&nbsp;&nbsp;</span><span class="RktVar">txexpr</span></td><td align="left" valign="baseline"><span class="stt">&nbsp;</span></td><td align="center" valign="baseline">=</td><td align="left" valign="baseline"><span class="stt">&nbsp;</span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/reference/pairs.html#%28def._%28%28quote._~23~25kernel%29._list%29%29" class="RktValLink" data-pltdoc="x">list</a></span><span class="hspace">&nbsp;</span><span class="RktVar">tag</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/reference/pairs.html#%28def._%28%28quote._~23~25kernel%29._list%29%29" class="RktValLink" data-pltdoc="x">list</a></span><span class="hspace">&nbsp;</span><span class="RktVar">attr</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="RktPn">)</span><span class="hspace">&nbsp;</span><span class="RktVar">element</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt">&nbsp;</span></td><td align="left" valign="baseline"><span class="stt">&nbsp;</span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt">&nbsp;</span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/reference/pairs.html#%28def._%28%28quote._~23~25kernel%29._cons%29%29" class="RktValLink" data-pltdoc="x">cons</a></span><span class="hspace">&nbsp;</span><span class="RktVar">tag</span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/reference/pairs.html#%28def._%28%28quote._~23~25kernel%29._list%29%29" class="RktValLink" data-pltdoc="x">list</a></span><span class="hspace">&nbsp;</span><span class="RktVar">element</span><span class="hspace">&nbsp;</span><span class="RktSym">...</span><span class="RktPn