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<body>
<div class="document" id="greek-fontenc-def">
<h1 class="title">greek-fontenc.def</h1>
<h2 class="subtitle" id="common-greek-font-encoding-definitions">Common Greek font encoding definitions</h2>

<dl class="docinfo">
<dt class="copyright">Copyright</dt>
<dd class="copyright">© 2013 Günter Milde</dd>
<dt>Licence</dt>
<dd><p>This work may be distributed and/or modified under the
conditions of the <a class="reference external" href="http://www.latex-project.org/lppl.txt">LaTeX Project Public License</a>, either
version&nbsp;1.3 of this license or any later version.</p>
</dd>
<dt>Identification</dt>
<dd><pre class="literal-block">\ProvidesFile{greek-fontenc.def}
[2013/11/28 v0.11 Common Greek font encoding definitions]
</pre>
</dd>
</dl>
<div class="abstract topic">
<p class="topic-title first">Abstract</p>
<p>This file provides definitions that are shared between
font encodings providing Greek characters.</p>
</div>
<dl class="docutils">
<dt>Changelog:</dt>
<dd><table class="borderless">
<colgroup>
<col width="7%" />
<col width="16%" />
<col width="77%" />
</colgroup>
<tbody>
<tr><td><p>0.9</p></td>
<td><p>2013-07-03</p></td>
<td><p>code “outsourced” from lgrxenc.def</p></td>
</tr>
<tr><td><p>0.9.1</p></td>
<td><p>2013-07-17</p></td>
<td><p>composite definitions starting with standard accent cmds</p></td>
</tr>
<tr><td><p>0.11</p></td>
<td><p>2013-11-28</p></td>
<td><p><tt class="literal">\greekscript</tt> TextCommand</p></td>
</tr>
</tbody>
</table>
</dd>
</dl>
<div class="section" id="usage">
<h1>Usage</h1>
<p>This file is input by the font encoding definition files <a class="reference external" href="lgrenc.def.html">lgrenc.def</a>. and
<a class="reference external" href="greek-euenc.def.html">greek-euenc.def</a>.</p>
</div>
<div class="section" id="implementation">
<h1>Implementation</h1>
<div class="section" id="ensuregreek-greekscript">
<h2>ensuregreek, greekscript</h2>
<p>Provide “empty” encoding-specific definitions for <tt class="literal">\ensuregreek</tt> and
<tt class="literal">\greekscript</tt>. The definitions in this file make the font encoding fit
for use with the Greek script. (See <tt class="literal">textalpha.sty</tt> for default
definitions.)</p>
<p>The <tt class="literal">\ensuregreek</tt> macro can be used to ensure that its argument is set
in a font encoding with support for Greek. If the active font encoding
supports it, kerning between adjacent command calls (e.g.
<tt class="literal"><span class="pre">\ensuregreek{A}\ensuregreek{\Upsilon}</span></tt>) is preserved. This allows, e.g.,
wrapping of compound Unicode character definitions.</p>
<pre class="literal-block">\ProvideTextCommand{\ensuregreek}{\LastDeclaredEncoding}[1]{#1}
</pre>
<p>The <tt class="literal">\greekscript</tt> declaration switches to a font encoding supporting
the Greek script, if required. The following definition announces the
<tt class="literal">\LastDeclaredEncoding</tt> as Greek-supporting:</p>
<pre class="literal-block">\ProvideTextCommand{\greekscript}{\LastDeclaredEncoding}{}
</pre>
</div>
<div class="section" id="aliases">
<h2>Aliases</h2>
<p>Aliases are defined via <cite>DeclareTextCommand</cite> so that up/downcasing works
without the need for additional <a class="reference internal" href="#uclclist">uclclist</a> entries.</p>
<p>Compatibility aliases for <a class="reference external" href="http://www.ctan.org/pkg/hyperref">hyperref</a>’s puenc.def:</p>
<pre class="literal-block">\DeclareTextCommand{\textstigmagreek}{\LastDeclaredEncoding}{\textstigma}
\DeclareTextCommand{\textkoppagreek}{\LastDeclaredEncoding}{\textkoppa}
\DeclareTextCommand{\textStigmagreek}{\LastDeclaredEncoding}{\textStigma}
\DeclareTextCommand{\textSampigreek}{\LastDeclaredEncoding}{\textSampi}
\DeclareTextCommand{\textsampigreek}{\LastDeclaredEncoding}{\textsampi}
\DeclareTextCommand{\textdigammagreek}{\LastDeclaredEncoding}{\textdigamma}
\DeclareTextCommand{\textDigammagreek}{\LastDeclaredEncoding}{\textDigamma}

\DeclareTextCommand{\textnumeralsigngreek}{\LastDeclaredEncoding}{\textdexiakeraia}
\DeclareTextCommand{\textnumeralsignlowergreek}{\LastDeclaredEncoding}{\textaristerikeraia}
</pre>
<p>Two Unicode names for one character:</p>
<pre class="literal-block">\DeclareTextCommand{\accoxia}{\LastDeclaredEncoding}{\acctonos}
\DeclareTextCommand{\acckoronis}{\LastDeclaredEncoding}{\accpsili}
</pre>
<p>Symbol macros for the breathings:</p>
<pre class="literal-block">\DeclareTextCommand{\&lt;}{\LastDeclaredEncoding}{\accdasia}
\DeclareTextCommand{\&gt;}{\LastDeclaredEncoding}{\accpsili}
</pre>
<p>TODO: do we also want alternative symbols for the breathings (cf. X compose
table, LCI encoding)?</p>
<pre class="code latex literal-block"><span class="keyword">\DeclareTextCommand</span><span class="name builtin">{</span><span class="literal string">\(</span><span class="name builtin">}{</span><span class="name variable">\LastDeclaredEncoding</span><span class="name builtin">}{</span><span class="name variable">\accdasia</span><span class="name builtin">}
</span><span class="name variable">\DeclareTextCommand</span><span class="name builtin">{</span><span class="literal string">\)</span><span class="name builtin">}{</span><span class="keyword">\LastDeclaredEncoding</span><span class="name builtin">}{</span><span class="keyword">\accpsili</span><span class="name builtin">}</span>
</pre>
<p>Names from <a class="reference external" href="http://www.ctan.org/pkg/babel">babel</a> and <a class="reference external" href="http://www.ctan.org/pkg/teubner">teubner</a> (do we want to define them here as alias?)</p>
<pre class="code latex literal-block"><span class="keyword">\DeclareTextCommand</span><span class="name builtin">{</span><span class="keyword">\anwtonos</span><span class="name builtin">}{</span><span class="keyword">\LastDeclaredEncoding</span><span class="name builtin">}{</span><span class="keyword">\textdexiakeraia</span><span class="name builtin">}</span>     <span class="comment">% ʹ
</span><span class="keyword">\DeclareTextCommand</span><span class="name builtin">{</span><span class="keyword">\katwtonos</span><span class="name builtin">}{</span><span class="keyword">\LastDeclaredEncoding</span><span class="name builtin">}{</span><span class="keyword">\textaristerikeraia</span><span class="name builtin">}</span> <span class="comment">% ͵</span>
</pre>
</div>
<div class="section" id="composite-diacritics">
<h2>Composite diacritics</h2>
<p>Composite accents can be input as sequence of simple diacritics (in
arbitrary order) via named macro, symbol macro and “transcription
characters”, e.g. one of</p>
<pre class="code latex literal-block"><span class="keyword">\accdialytica</span><span class="keyword">\accvaria</span><span class="keyword">\textalpha</span>,
<span class="keyword">\&quot;</span><span class="keyword">\'</span><span class="keyword">\textalpha</span>,
<span class="keyword">\&quot;</span>'<span class="keyword">\textalpha</span>, or
<span class="keyword">\'</span>&quot;<span class="keyword">\textalpha</span>.
</pre>
<p>Separate definitions for the supported variants of the second input token
are required as composition is based on the non-expanded input</p>
<p>The composition with simple “transcription characters” must also be defined
for the symbol macros, otherwise it fails with <tt class="literal">\Makeuppercase</tt>.</p>
<p>For Unicode encodings (where they do not resolve to Greek named macros,
composite definitions starting with standard macros are requried:</p>
<pre class="literal-block">\DeclareTextCompositeCommand{\accdialytika}{\LastDeclaredEncoding}{\acctonos}{\accdialytikatonos}
\DeclareTextCompositeCommand{\accdialytika}{\LastDeclaredEncoding}{\'}{\accdialytikatonos}
\DeclareTextCompositeCommand{\accdialytika}{\LastDeclaredEncoding}{'}{\accdialytikatonos}
\DeclareTextCompositeCommand{\&quot;}{\LastDeclaredEncoding}{\'}{\accdialytikatonos}
\DeclareTextCompositeCommand{\&quot;}{\LastDeclaredEncoding}{'}{\accdialytikatonos}
\DeclareTextCompositeCommand{\accdialytika}{\LastDeclaredEncoding}{\accvaria}{\accdialytikavaria}
\DeclareTextCompositeCommand{\accdialytika}{\LastDeclaredEncoding}{\`}{\accdialytikavaria}
\DeclareTextCompositeCommand{\accdialytika}{\LastDeclaredEncoding}{`}{\accdialytikavaria}
\DeclareTextCompositeCommand{\&quot;}{\LastDeclaredEncoding}{\`}{\accdialytikavaria}
\DeclareTextCompositeCommand{\&quot;}{\LastDeclaredEncoding}{`}{\accdialytikavaria}
\DeclareTextCompositeCommand{\accdialytika}{\LastDeclaredEncoding}{\accperispomeni}{\accdialytikaperispomeni}
\DeclareTextCompositeCommand{\accdialytika}{\LastDeclaredEncoding}{\~}{\accdialytikaperispomeni}
\DeclareTextCompositeCommand{\accdialytika}{\LastDeclaredEncoding}{~}{\accdialytikaperispomeni}
\DeclareTextCompositeCommand{\&quot;}{\LastDeclaredEncoding}{\~}{\accdialytikaperispomeni}
\DeclareTextCompositeCommand{\&quot;}{\LastDeclaredEncoding}{~}{\accdialytikaperispomeni}

\DeclareTextCompositeCommand{\acctonos}{\LastDeclaredEncoding}{\accdialytika}{\accdialytikatonos}
\DeclareTextCompositeCommand{\acctonos}{\LastDeclaredEncoding}{\&quot;}{\accdialytikatonos}
\DeclareTextCompositeCommand{\acctonos}{\LastDeclaredEncoding}{&quot;}{\accdialytikatonos}
\DeclareTextCompositeCommand{\'}{\LastDeclaredEncoding}{\&quot;}{\accdialytikatonos}
\DeclareTextCompositeCommand{\'}{\LastDeclaredEncoding}{&quot;}{\accdialytikatonos}
\DeclareTextCompositeCommand{\acctonos}{\LastDeclaredEncoding}{\accdasia}{\accdasiaoxia}
\DeclareTextCompositeCommand{\acctonos}{\LastDeclaredEncoding}{\&lt;}{\accdasiaoxia}
\DeclareTextCompositeCommand{\acctonos}{\LastDeclaredEncoding}{&lt;}{\accdasiaoxia}
\DeclareTextCompositeCommand{\'}{\LastDeclaredEncoding}{\&lt;}{\accdasiaoxia}
\DeclareTextCompositeCommand{\'}{\LastDeclaredEncoding}{&lt;}{\accdasiaoxia}
\DeclareTextCompositeCommand{\acctonos}{\LastDeclaredEncoding}{\accpsili}{\accpsilioxia}
\DeclareTextCompositeCommand{\acctonos}{\LastDeclaredEncoding}{\&gt;}{\accpsilioxia}
\DeclareTextCompositeCommand{\acctonos}{\LastDeclaredEncoding}{&gt;}{\accpsilioxia}
\DeclareTextCompositeCommand{\'}{\LastDeclaredEncoding}{\&gt;}{\accpsilioxia}
\DeclareTextCompositeCommand{\'}{\LastDeclaredEncoding}{&gt;}{\accpsilioxia}
\DeclareTextCompositeCommand{\'}{\LastDeclaredEncoding}{\'}{\textquoteright}
\DeclareTextCompositeCommand{\'}{\LastDeclaredEncoding}{'}{\textquoteright}

\DeclareTextCompositeCommand{\accvaria}{\LastDeclaredEncoding}{\accdialytika}{\accdialytikavaria}
\DeclareTextCompositeCommand{\accvaria}{\LastDeclaredEncoding}{\&quot;}{\accdialytikavaria}
\DeclareTextCompositeCommand{\accvaria}{\LastDeclaredEncoding}{&quot;}{\accdialytikavaria}
\DeclareTextCompositeCommand{\`}{\LastDeclaredEncoding}{\&quot;}{\accdialytikavaria}
\DeclareTextCompositeCommand{\`}{\LastDeclaredEncoding}{&quot;}{\accdialytikavaria}
\DeclareTextCompositeCommand{\accvaria}{\LastDeclaredEncoding}{\accdasia}{\accdasiavaria}
\DeclareTextCompositeCommand{\accvaria}{\LastDeclaredEncoding}{\&lt;}{\accdasiavaria}
\DeclareTextCompositeCommand{\accvaria}{\LastDeclaredEncoding}{&lt;}{\accdasiavaria}
\DeclareTextCompositeCommand{\`}{\LastDeclaredEncoding}{\&lt;}{\accdasiavaria}
\DeclareTextCompositeCommand{\`}{\LastDeclaredEncoding}{&lt;}{\accdasiavaria}
\DeclareTextCompositeCommand{\accvaria}{\LastDeclaredEncoding}{\accpsili}{\accpsilivaria}
\DeclareTextCompositeCommand{\accvaria}{\LastDeclaredEncoding}{\&gt;}{\accpsilivaria}
\DeclareTextCompositeCommand{\accvaria}{\LastDeclaredEncoding}{&gt;}{\accpsilivaria}
\DeclareTextCompositeCommand{\`}{\LastDeclaredEncoding}{\&gt;}{\accpsilivaria}
\DeclareTextCompositeCommand{\`}{\LastDeclaredEncoding}{&gt;}{\accpsilivaria}
\DeclareTextCompositeCommand{\`}{\LastDeclaredEncoding}{\`}{\textquoteleft}
\DeclareTextCompositeCommand{\`}{\LastDeclaredEncoding}{`}{\textquoteleft}

\DeclareTextCompositeCommand{\accperispomeni}{\LastDeclaredEncoding}{\accdialytika}{\accdialytikaperispomeni}
\DeclareTextCompositeCommand{\accperispomeni}{\LastDeclaredEncoding}{\&quot;}{\accdialytikaperispomeni}
\DeclareTextCompositeCommand{\accperispomeni}{\LastDeclaredEncoding}{&quot;}{\accdialytikaperispomeni}
\DeclareTextCompositeCommand{\~}{\LastDeclaredEncoding}{\&quot;}{\accdialytikaperispomeni}
\DeclareTextCompositeCommand{\~}{\LastDeclaredEncoding}{&quot;}{\accdialytikaperispomeni}
\DeclareTextCompositeCommand{\accperispomeni}{\LastDeclaredEncoding}{\accdasia}{\accdasiaperispomeni}
\DeclareTextCompositeCommand{\accperispomeni}{\LastDeclaredEncoding}{\&lt;}{\accdasiaperispomeni}
\DeclareTextCompositeCommand{\accperispomeni}{\LastDeclaredEncoding}{&lt;}{\accdasiaperispomeni}
\DeclareTextCompositeCommand{\~}{\LastDeclaredEncoding}{\&lt;}{\accdasiaperispomeni}
\DeclareTextCompositeCommand{\~}{\LastDeclaredEncoding}{&lt;}{\accdasiaperispomeni}
\DeclareTextCompositeCommand{\accperispomeni}{\LastDeclaredEncoding}{\accpsili}{\accpsiliperispomeni}
\DeclareTextCompositeCommand{\accperispomeni}{\LastDeclaredEncoding}{\&gt;}{\accpsiliperispomeni}
\DeclareTextCompositeCommand{\accperispomeni}{\LastDeclaredEncoding}{&gt;}{\accpsiliperispomeni}
\DeclareTextCompositeCommand{\~}{\LastDeclaredEncoding}{\&gt;}{\accpsiliperispomeni}
\DeclareTextCompositeCommand{\~}{\LastDeclaredEncoding}{&gt;}{\accpsiliperispomeni}

\DeclareTextCompositeCommand{\accpsili}{\LastDeclaredEncoding}{\acctonos}{\accpsilioxia}
\DeclareTextCompositeCommand{\accpsili}{\LastDeclaredEncoding}{\'}{\accpsilioxia}
\DeclareTextCompositeCommand{\accpsili}{\LastDeclaredEncoding}{'}{\accpsilioxia}
\DeclareTextCompositeCommand{\&gt;}{\LastDeclaredEncoding}{'}{\accpsilioxia}
\DeclareTextCompositeCommand{\accpsili}{\LastDeclaredEncoding}{\accvaria}{\accpsilivaria}
\DeclareTextCompositeCommand{\accpsili}{\LastDeclaredEncoding}{\`}{\accpsilivaria}
\DeclareTextCompositeCommand{\accpsili}{\LastDeclaredEncoding}{`}{\accpsilivaria}
\DeclareTextCompositeCommand{\&gt;}{\LastDeclaredEncoding}{`}{\accpsilivaria}
\DeclareTextCompositeCommand{\accpsili}{\LastDeclaredEncoding}{\accperispomeni}{\accpsiliperispomeni}
\DeclareTextCompositeCommand{\accpsili}{\LastDeclaredEncoding}{\~}{\accpsiliperispomeni}
\DeclareTextCompositeCommand{\accpsili}{\LastDeclaredEncoding}{~}{\accpsiliperispomeni}
\DeclareTextCompositeCommand{\&gt;}{\LastDeclaredEncoding}{~}{\accpsiliperispomeni}

\DeclareTextCompositeCommand{\accdasia}{\LastDeclaredEncoding}{\acctonos}{\accdasiaoxia}
\DeclareTextCompositeCommand{\accdasia}{\LastDeclaredEncoding}{\'}{\accdasiaoxia}
\DeclareTextCompositeCommand{\accdasia}{\LastDeclaredEncoding}{'}{\accdasiaoxia}
\DeclareTextCompositeCommand{\&lt;}{\LastDeclaredEncoding}{'}{\accdasiaoxia}
\DeclareTextCompositeCommand{\accdasia}{\LastDeclaredEncoding}{\accvaria}{\accdasiavaria}
\DeclareTextCompositeCommand{\accdasia}{\LastDeclaredEncoding}{\`}{\accdasiavaria}
\DeclareTextCompositeCommand{\accdasia}{\LastDeclaredEncoding}{`}{\accdasiavaria}
\DeclareTextCompositeCommand{\&lt;}{\LastDeclaredEncoding}{`}{\accdasiavaria}
\DeclareTextCompositeCommand{\accdasia}{\LastDeclaredEncoding}{\accperispomeni}{\accdasiaperispomeni}
\DeclareTextCompositeCommand{\accdasia}{\LastDeclaredEncoding}{\~}{\accdasiaperispomeni}
\DeclareTextCompositeCommand{\&lt;}{\LastDeclaredEncoding}{~}{\accdasiaperispomeni}
</pre>
</div>
<div class="section" id="uppercase">
<span id="uclclist"></span><h2>UPPERCASE</h2>
<p>If UPPERCASE (all-caps) is generated with <tt class="literal">\MakeUppercase</tt>, macro
substitutions in the <tt class="literal">\&#64;uclclist</tt> apply. This can be used to drop the
diacritics (except dialytika and sub-iota). Different conventions exist for
the <a class="reference external" href="http://www.tlg.uci.edu/~opoudjis/unicode/unicode_adscript.html">treatment of sub-iota with uppercase letters</a>. In the CB Fonts, an
“index” iota is used.</p>
<div class="section" id="uclclist-extension">
<h3>&#64;uclclist extension</h3>
<p>Based on the <a class="reference external" href="http://www.eutypon.gr/eutypon/pdf/e2008-20/e20-a03.pdf">babel patch</a> and <tt class="literal">fontenc.sty</tt>.</p>
<p>The definition of an auxiliary, self-restting macro makes this idempotent
(only the first use of this function will expand the <tt class="literal">&#64;uclclist</tt>).
The second and third lines are TeX’ way of writing <tt class="literal">uclclist += …</tt>:</p>
<pre class="literal-block">\providecommand*\update&#64;uclc&#64;with&#64;greek{%
  \expandafter\def\expandafter\&#64;uclclist\expandafter{%
    \&#64;uclclist
    \accdasia\LGR&#64;accdropped
    \accdasiaoxia\LGR&#64;hiatus
    \accdasiavaria\LGR&#64;accdropped
    \accdasiaperispomeni\LGR&#64;accdropped
    \accpsili\LGR&#64;hiatus
    \accpsilioxia\LGR&#64;hiatus
    \accpsilivaria\LGR&#64;hiatus
    \accpsiliperispomeni\LGR&#64;accdropped
    \acctonos\LGR&#64;hiatus
    \accvaria\LGR&#64;accdropped
    \accdialytikatonos\LGR&#64;accDialytika
    \accdialytikavaria\LGR&#64;accDialytika
    \accdialytikaperispomeni\LGR&#64;accDialytika
    \accperispomeni\LGR&#64;accdropped
    \ypogegrammeni\prosgegrammeni
    \textalpha  \textAlpha
    \textbeta   \textBeta
    \textgamma  \textGamma
    \textdelta  \textDelta
    \textepsilon\textEpsilon
    \textzeta   \textZeta
    \texteta    \textEta
    \texttheta  \textTheta
    \textiota   \textIota
    \textkappa  \textKappa
    \textlambda \textLambda
    \textmu     \textMu
    \textnu     \textNu
    \textxi     \textXi
    \textomicron\textOmicron
    \textpi     \textPi
    \textrho    \textRho
    \textvarsigma  \textSigma
    \textsigma     \textSigma
    \textautosigma \textSigma
    \texttau    \textTau
    \textupsilon\textUpsilon
    \textphi    \textPhi
    \textchi    \textChi
    \textpsi    \textPsi
    \textomega  \textOmega
    \textqoppa     \textQoppa
    \textvarstigma \textStigma
    \textstigma    \textStigma
    \textsampi     \textSampi
    \textdigamma   \textDigamma
  }%
  \let\update&#64;uclc&#64;with&#64;greek\relax
}
</pre>
<p>Expand the uclc list using the just defined macro:</p>
<pre class="literal-block">\update&#64;uclc&#64;with&#64;greek
</pre>
</div>
<div class="section" id="substitution-macros">
<h3>Substitution macros</h3>
<p>Drop diacritics (The argument passing ensures that kerning is preserved)</p>
<pre class="literal-block">\DeclareTextCommand{\LGR&#64;accdropped}{\LastDeclaredEncoding}[1]{#1}
</pre>
<p>Keep dialytika: Define a dummy alias so that downcasing with
<tt class="literal">\MakeLowercase</tt> does not convert a simple dialytika to a composite
accent:</p>
<pre class="literal-block">\DeclareTextCommand{\LGR&#64;accDialytika}{\LastDeclaredEncoding}{\accdialytika}
\DeclareTextCompositeCommand{\accdialytika}{\LastDeclaredEncoding}{\LGR&#64;hiatus}{\accdialytika}
</pre>
</div>
<div class="section" id="mark-hiatus">
<h3>Mark hiatus</h3>
<p>Tonos and dasia mark a hiatus if placed on the
first vowel of a diphthong (ΑΙ, ΑΥ, ΕΙ). A dialytika must be placed on the
second vowel if they are dropped (άυλος → ΑΫΛΟΣ, μάινα → ΜΑΪΝΑ, κέικ → ΚΕΪΚ,
ἀυπνία → ΑΫΠΝΙΑ):</p>
<pre class="literal-block">\DeclareTextCommand{\LGR&#64;hiatus}{\LastDeclaredEncoding}[1]{#1}
\DeclareTextCompositeCommand{\LGR&#64;hiatus}{\LastDeclaredEncoding}{&gt;}{\LGR&#64;hiatus}
\DeclareTextCompositeCommand{\LGR&#64;hiatus}{\LastDeclaredEncoding}{&lt;}{\LGR&#64;accdropped}
\DeclareTextCompositeCommand{\LGR&#64;hiatus}{\LastDeclaredEncoding}{\textAlpha}{\LGR&#64;A&#64;hiatus}
\DeclareTextCompositeCommand{\LGR&#64;hiatus}{\LastDeclaredEncoding}{\textEpsilon}{\LGR&#64;E&#64;hiatus}
</pre>
<p>The font encoding file must define the <tt class="literal">\LGR&#64;hiatus</tt> TextCommand. See
<tt class="literal">lgrenc.def</tt> for an example.</p>
<p>The following macro can be used to test if the next character is an Alpha or
Epsilon. As <tt class="literal">\&#64;ifnextchar</tt> gobbles spaces the lookahead macro definition
from <tt class="literal">amsgen.sty</tt> is used:</p>
<blockquote>
<p>This macro is a new version of LaTeX’s <tt class="literal">\&#64;ifnextchar</tt>, macro
that does not skip over spaces.</p>
</blockquote>
<pre class="literal-block">\providecommand*{\LGR&#64;ifnextchar}[3]{%
  \let\reserved&#64;d= #1%
  \def\reserved&#64;a{#2}\def\reserved&#64;b{#3}%
  \futurelet\&#64;let&#64;token\LGR&#64;ifnch
}
\providecommand*{\LGR&#64;ifnch}{%
  \ifx\&#64;let&#64;token\reserved&#64;d \let\reserved&#64;b\reserved&#64;a \fi
  \reserved&#64;b
}
</pre>
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