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<p class="right" id="characterp-0"><span id="index-0"></span><strong>protocol</strong></p>
<section id="characterp">
<h1><code class="docutils literal notranslate"><span class="pre">characterp</span></code><a class="headerlink" href="#characterp" title="Link to this heading"></a></h1>
<p>Character protocol.</p>
<div class="line-block">
<div class="line"><strong>Availability:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">logtalk_load(types(loader))</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Author:</strong> Paulo Moura</div>
<div class="line"><strong>Version:</strong> 1:3:0</div>
<div class="line"><strong>Date:</strong> 2019-06-29</div>
</div>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Dependencies:</strong></div>
<div class="line-block">
<div class="line">(none)</div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Remarks:</strong></div>
<div class="line-block">
<div class="line">(none)</div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Inherited public predicates:</strong></div>
<div class="line-block">
<div class="line">(none)</div>
</div>
</div>
<nav class="contents local" id="contents">
<ul class="simple">
<li><p><a class="reference internal" href="#public-predicates" id="id1">Public predicates</a></p>
<ul>
<li><p><a class="reference internal" href="#is-ascii-1" id="id2"><code class="docutils literal notranslate"><span class="pre">is_ascii/1</span></code></a></p></li>
<li><p><a class="reference internal" href="#is-alphanumeric-1" id="id3"><code class="docutils literal notranslate"><span class="pre">is_alphanumeric/1</span></code></a></p></li>
<li><p><a class="reference internal" href="#is-alpha-1" id="id4"><code class="docutils literal notranslate"><span class="pre">is_alpha/1</span></code></a></p></li>
<li><p><a class="reference internal" href="#is-letter-1" id="id5"><code class="docutils literal notranslate"><span class="pre">is_letter/1</span></code></a></p></li>
<li><p><a class="reference internal" href="#is-bin-digit-1" id="id6"><code class="docutils literal notranslate"><span class="pre">is_bin_digit/1</span></code></a></p></li>
<li><p><a class="reference internal" href="#is-octal-digit-1" id="id7"><code class="docutils literal notranslate"><span class="pre">is_octal_digit/1</span></code></a></p></li>
<li><p><a class="reference internal" href="#is-dec-digit-1" id="id8"><code class="docutils literal notranslate"><span class="pre">is_dec_digit/1</span></code></a></p></li>
<li><p><a class="reference internal" href="#is-hex-digit-1" id="id9"><code class="docutils literal notranslate"><span class="pre">is_hex_digit/1</span></code></a></p></li>
<li><p><a class="reference internal" href="#is-lower-case-1" id="id10"><code class="docutils literal notranslate"><span class="pre">is_lower_case/1</span></code></a></p></li>
<li><p><a class="reference internal" href="#is-upper-case-1" id="id11"><code class="docutils literal notranslate"><span class="pre">is_upper_case/1</span></code></a></p></li>
<li><p><a class="reference internal" href="#is-vowel-1" id="id12"><code class="docutils literal notranslate"><span class="pre">is_vowel/1</span></code></a></p></li>
<li><p><a class="reference internal" href="#is-white-space-1" id="id13"><code class="docutils literal notranslate"><span class="pre">is_white_space/1</span></code></a></p></li>
<li><p><a class="reference internal" href="#is-layout-1" id="id14"><code class="docutils literal notranslate"><span class="pre">is_layout/1</span></code></a></p></li>
<li><p><a class="reference internal" href="#is-quote-1" id="id15"><code class="docutils literal notranslate"><span class="pre">is_quote/1</span></code></a></p></li>
<li><p><a class="reference internal" href="#is-punctuation-1" id="id16"><code class="docutils literal notranslate"><span class="pre">is_punctuation/1</span></code></a></p></li>
<li><p><a class="reference internal" href="#is-period-1" id="id17"><code class="docutils literal notranslate"><span class="pre">is_period/1</span></code></a></p></li>
<li><p><a class="reference internal" href="#is-control-1" id="id18"><code class="docutils literal notranslate"><span class="pre">is_control/1</span></code></a></p></li>
<li><p><a class="reference internal" href="#is-newline-1" id="id19"><code class="docutils literal notranslate"><span class="pre">is_newline/1</span></code></a></p></li>
<li><p><a class="reference internal" href="#is-end-of-line-1" id="id20"><code class="docutils literal notranslate"><span class="pre">is_end_of_line/1</span></code></a></p></li>
<li><p><a class="reference internal" href="#parenthesis-2" id="id21"><code class="docutils literal notranslate"><span class="pre">parenthesis/2</span></code></a></p></li>
<li><p><a class="reference internal" href="#lower-upper-2" id="id22"><code class="docutils literal notranslate"><span class="pre">lower_upper/2</span></code></a></p></li>
</ul>
</li>
<li><p><a class="reference internal" href="#protected-predicates" id="id23">Protected predicates</a></p></li>
<li><p><a class="reference internal" href="#private-predicates" id="id24">Private predicates</a></p></li>
<li><p><a class="reference internal" href="#operators" id="id25">Operators</a></p></li>
</ul>
</nav>
<section id="public-predicates">
<h2><a class="toc-backref" href="#contents" role="doc-backlink">Public predicates</a><a class="headerlink" href="#public-predicates" title="Link to this heading"></a></h2>
<section id="is-ascii-1">
<span id="characterp-0-is-ascii-1"></span><span id="index-1"></span><h3><a class="toc-backref" href="#contents" role="doc-backlink"><code class="docutils literal notranslate"><span class="pre">is_ascii/1</span></code></a><a class="headerlink" href="#is-ascii-1" title="Link to this heading"></a></h3>
<p>True if the argument is an ASCII character.</p>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Template:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_ascii(Char)</span></code></div>
</div>
<div class="line"><strong>Mode and number of proofs:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_ascii(+char)</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_one</span></code></div>
</div>
</div>
<hr class="docutils" />
</section>
<section id="is-alphanumeric-1">
<span id="characterp-0-is-alphanumeric-1"></span><span id="index-2"></span><h3><a class="toc-backref" href="#contents" role="doc-backlink"><code class="docutils literal notranslate"><span class="pre">is_alphanumeric/1</span></code></a><a class="headerlink" href="#is-alphanumeric-1" title="Link to this heading"></a></h3>
<p>True if the argument is an alphanumeric character.</p>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Template:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_alphanumeric(Char)</span></code></div>
</div>
<div class="line"><strong>Mode and number of proofs:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_alphanumeric(+char)</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_one</span></code></div>
</div>
</div>
<hr class="docutils" />
</section>
<section id="is-alpha-1">
<span id="characterp-0-is-alpha-1"></span><span id="index-3"></span><h3><a class="toc-backref" href="#contents" role="doc-backlink"><code class="docutils literal notranslate"><span class="pre">is_alpha/1</span></code></a><a class="headerlink" href="#is-alpha-1" title="Link to this heading"></a></h3>
<p>True if the argument is a letter or an underscore.</p>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Template:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_alpha(Char)</span></code></div>
</div>
<div class="line"><strong>Mode and number of proofs:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_alpha(+char)</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_one</span></code></div>
</div>
</div>
<hr class="docutils" />
</section>
<section id="is-letter-1">
<span id="characterp-0-is-letter-1"></span><span id="index-4"></span><h3><a class="toc-backref" href="#contents" role="doc-backlink"><code class="docutils literal notranslate"><span class="pre">is_letter/1</span></code></a><a class="headerlink" href="#is-letter-1" title="Link to this heading"></a></h3>
<p>True if the argument is a letter.</p>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Template:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_letter(Char)</span></code></div>
</div>
<div class="line"><strong>Mode and number of proofs:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_letter(+char)</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_one</span></code></div>
</div>
</div>
<hr class="docutils" />
</section>
<section id="is-bin-digit-1">
<span id="characterp-0-is-bin-digit-1"></span><span id="index-5"></span><h3><a class="toc-backref" href="#contents" role="doc-backlink"><code class="docutils literal notranslate"><span class="pre">is_bin_digit/1</span></code></a><a class="headerlink" href="#is-bin-digit-1" title="Link to this heading"></a></h3>
<p>True if the argument is a binary digit.</p>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Template:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_bin_digit(Char)</span></code></div>
</div>
<div class="line"><strong>Mode and number of proofs:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_bin_digit(+char)</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_one</span></code></div>
</div>
</div>
<hr class="docutils" />
</section>
<section id="is-octal-digit-1">
<span id="characterp-0-is-octal-digit-1"></span><span id="index-6"></span><h3><a class="toc-backref" href="#contents" role="doc-backlink"><code class="docutils literal notranslate"><span class="pre">is_octal_digit/1</span></code></a><a class="headerlink" href="#is-octal-digit-1" title="Link to this heading"></a></h3>
<p>True if the argument is an octal digit.</p>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Template:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_octal_digit(Char)</span></code></div>
</div>
<div class="line"><strong>Mode and number of proofs:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_octal_digit(+char)</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_one</span></code></div>
</div>
</div>
<hr class="docutils" />
</section>
<section id="is-dec-digit-1">
<span id="characterp-0-is-dec-digit-1"></span><span id="index-7"></span><h3><a class="toc-backref" href="#contents" role="doc-backlink"><code class="docutils literal notranslate"><span class="pre">is_dec_digit/1</span></code></a><a class="headerlink" href="#is-dec-digit-1" title="Link to this heading"></a></h3>
<p>True if the argument is a decimal digit.</p>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Template:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_dec_digit(Char)</span></code></div>
</div>
<div class="line"><strong>Mode and number of proofs:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_dec_digit(+char)</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_one</span></code></div>
</div>
</div>
<hr class="docutils" />
</section>
<section id="is-hex-digit-1">
<span id="characterp-0-is-hex-digit-1"></span><span id="index-8"></span><h3><a class="toc-backref" href="#contents" role="doc-backlink"><code class="docutils literal notranslate"><span class="pre">is_hex_digit/1</span></code></a><a class="headerlink" href="#is-hex-digit-1" title="Link to this heading"></a></h3>
<p>True if the argument is an hexadecimal digit.</p>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Template:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_hex_digit(Char)</span></code></div>
</div>
<div class="line"><strong>Mode and number of proofs:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_hex_digit(+char)</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_one</span></code></div>
</div>
</div>
<hr class="docutils" />
</section>
<section id="is-lower-case-1">
<span id="characterp-0-is-lower-case-1"></span><span id="index-9"></span><h3><a class="toc-backref" href="#contents" role="doc-backlink"><code class="docutils literal notranslate"><span class="pre">is_lower_case/1</span></code></a><a class="headerlink" href="#is-lower-case-1" title="Link to this heading"></a></h3>
<p>True if the argument is a lower case letter.</p>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Template:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_lower_case(Char)</span></code></div>
</div>
<div class="line"><strong>Mode and number of proofs:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_lower_case(+char)</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_one</span></code></div>
</div>
</div>
<hr class="docutils" />
</section>
<section id="is-upper-case-1">
<span id="characterp-0-is-upper-case-1"></span><span id="index-10"></span><h3><a class="toc-backref" href="#contents" role="doc-backlink"><code class="docutils literal notranslate"><span class="pre">is_upper_case/1</span></code></a><a class="headerlink" href="#is-upper-case-1" title="Link to this heading"></a></h3>
<p>True if the argument is a upper case letter.</p>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Template:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_upper_case(Char)</span></code></div>
</div>
<div class="line"><strong>Mode and number of proofs:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_upper_case(+char)</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_one</span></code></div>
</div>
</div>
<hr class="docutils" />
</section>
<section id="is-vowel-1">
<span id="characterp-0-is-vowel-1"></span><span id="index-11"></span><h3><a class="toc-backref" href="#contents" role="doc-backlink"><code class="docutils literal notranslate"><span class="pre">is_vowel/1</span></code></a><a class="headerlink" href="#is-vowel-1" title="Link to this heading"></a></h3>
<p>True if the argument is a vowel.</p>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Template:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_vowel(Char)</span></code></div>
</div>
<div class="line"><strong>Mode and number of proofs:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_vowel(+char)</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_one</span></code></div>
</div>
</div>
<hr class="docutils" />
</section>
<section id="is-white-space-1">
<span id="characterp-0-is-white-space-1"></span><span id="index-12"></span><h3><a class="toc-backref" href="#contents" role="doc-backlink"><code class="docutils literal notranslate"><span class="pre">is_white_space/1</span></code></a><a class="headerlink" href="#is-white-space-1" title="Link to this heading"></a></h3>
<p>True if the argument is a white space character (a space or a tab) inside a line of characters.</p>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Template:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_white_space(Char)</span></code></div>
</div>
<div class="line"><strong>Mode and number of proofs:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_white_space(+char)</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_one</span></code></div>
</div>
</div>
<hr class="docutils" />
</section>
<section id="is-layout-1">
<span id="characterp-0-is-layout-1"></span><span id="index-13"></span><h3><a class="toc-backref" href="#contents" role="doc-backlink"><code class="docutils literal notranslate"><span class="pre">is_layout/1</span></code></a><a class="headerlink" href="#is-layout-1" title="Link to this heading"></a></h3>
<p>True if the argument is a layout character.</p>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Template:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_layout(Char)</span></code></div>
</div>
<div class="line"><strong>Mode and number of proofs:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_layout(+char)</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_one</span></code></div>
</div>
</div>
<hr class="docutils" />
</section>
<section id="is-quote-1">
<span id="characterp-0-is-quote-1"></span><span id="index-14"></span><h3><a class="toc-backref" href="#contents" role="doc-backlink"><code class="docutils literal notranslate"><span class="pre">is_quote/1</span></code></a><a class="headerlink" href="#is-quote-1" title="Link to this heading"></a></h3>
<p>True if the argument is a quote character.</p>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Template:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_quote(Char)</span></code></div>
</div>
<div class="line"><strong>Mode and number of proofs:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_quote(+char)</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_one</span></code></div>
</div>
</div>
<hr class="docutils" />
</section>
<section id="is-punctuation-1">
<span id="characterp-0-is-punctuation-1"></span><span id="index-15"></span><h3><a class="toc-backref" href="#contents" role="doc-backlink"><code class="docutils literal notranslate"><span class="pre">is_punctuation/1</span></code></a><a class="headerlink" href="#is-punctuation-1" title="Link to this heading"></a></h3>
<p>True if the argument is a sentence punctuation character.</p>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Template:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_punctuation(Char)</span></code></div>
</div>
<div class="line"><strong>Mode and number of proofs:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_punctuation(+char)</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_one</span></code></div>
</div>
</div>
<hr class="docutils" />
</section>
<section id="is-period-1">
<span id="characterp-0-is-period-1"></span><span id="index-16"></span><h3><a class="toc-backref" href="#contents" role="doc-backlink"><code class="docutils literal notranslate"><span class="pre">is_period/1</span></code></a><a class="headerlink" href="#is-period-1" title="Link to this heading"></a></h3>
<p>True if the argument is a character that ends a sentence.</p>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Template:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_period(Char)</span></code></div>
</div>
<div class="line"><strong>Mode and number of proofs:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_period(+char)</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_one</span></code></div>
</div>
</div>
<hr class="docutils" />
</section>
<section id="is-control-1">
<span id="characterp-0-is-control-1"></span><span id="index-17"></span><h3><a class="toc-backref" href="#contents" role="doc-backlink"><code class="docutils literal notranslate"><span class="pre">is_control/1</span></code></a><a class="headerlink" href="#is-control-1" title="Link to this heading"></a></h3>
<p>True if the argument is an ASCII control character.</p>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Template:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_control(Char)</span></code></div>
</div>
<div class="line"><strong>Mode and number of proofs:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_control(+char)</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_one</span></code></div>
</div>
</div>
<hr class="docutils" />
</section>
<section id="is-newline-1">
<span id="characterp-0-is-newline-1"></span><span id="index-18"></span><h3><a class="toc-backref" href="#contents" role="doc-backlink"><code class="docutils literal notranslate"><span class="pre">is_newline/1</span></code></a><a class="headerlink" href="#is-newline-1" title="Link to this heading"></a></h3>
<p>True if the argument is the ASCII newline character.</p>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Template:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_newline(Char)</span></code></div>
</div>
<div class="line"><strong>Mode and number of proofs:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_newline(+char)</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_one</span></code></div>
</div>
</div>
<hr class="docutils" />
</section>
<section id="is-end-of-line-1">
<span id="characterp-0-is-end-of-line-1"></span><span id="index-19"></span><h3><a class="toc-backref" href="#contents" role="doc-backlink"><code class="docutils literal notranslate"><span class="pre">is_end_of_line/1</span></code></a><a class="headerlink" href="#is-end-of-line-1" title="Link to this heading"></a></h3>
<p>True if the argument is the ASCII end-of-line character (either a carriage return or a line feed).</p>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Template:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_end_of_line(Char)</span></code></div>
</div>
<div class="line"><strong>Mode and number of proofs:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">is_end_of_line(+char)</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_one</span></code></div>
</div>
</div>
<hr class="docutils" />
</section>
<section id="parenthesis-2">
<span id="characterp-0-parenthesis-2"></span><span id="index-20"></span><h3><a class="toc-backref" href="#contents" role="doc-backlink"><code class="docutils literal notranslate"><span class="pre">parenthesis/2</span></code></a><a class="headerlink" href="#parenthesis-2" title="Link to this heading"></a></h3>
<p>Recognizes and converts between open and close parenthesis.</p>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Template:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">parenthesis(Char1,Char2)</span></code></div>
</div>
<div class="line"><strong>Mode and number of proofs:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">parenthesis(?char,?char)</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_more</span></code></div>
<div class="line"><code class="docutils literal notranslate"><span class="pre">parenthesis(+char,?char)</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_one</span></code></div>
<div class="line"><code class="docutils literal notranslate"><span class="pre">parenthesis(?char,+char)</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_one</span></code></div>
</div>
</div>
<hr class="docutils" />
</section>
<section id="lower-upper-2">
<span id="characterp-0-lower-upper-2"></span><span id="index-21"></span><h3><a class="toc-backref" href="#contents" role="doc-backlink"><code class="docutils literal notranslate"><span class="pre">lower_upper/2</span></code></a><a class="headerlink" href="#lower-upper-2" title="Link to this heading"></a></h3>
<p>Recognizes and converts between lower and upper case letters.</p>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Template:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">lower_upper(Char1,Char2)</span></code></div>
</div>
<div class="line"><strong>Mode and number of proofs:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">lower_upper(?char,?char)</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_more</span></code></div>
<div class="line"><code class="docutils literal notranslate"><span class="pre">lower_upper(+char,?char)</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_one</span></code></div>
<div class="line"><code class="docutils literal notranslate"><span class="pre">lower_upper(?char,+char)</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_one</span></code></div>
</div>
</div>
</section>
</section>
<hr class="docutils" />
<section id="protected-predicates">
<h2><a class="toc-backref" href="#contents" role="doc-backlink">Protected predicates</a><a class="headerlink" href="#protected-predicates" title="Link to this heading"></a></h2>
<p>(none)</p>
</section>
<section id="private-predicates">
<h2><a class="toc-backref" href="#contents" role="doc-backlink">Private predicates</a><a class="headerlink" href="#private-predicates" title="Link to this heading"></a></h2>
<p>(none)</p>
</section>
<section id="operators">
<h2><a class="toc-backref" href="#contents" role="doc-backlink">Operators</a><a class="headerlink" href="#operators" title="Link to this heading"></a></h2>
<p>(none)</p>
<div class="admonition seealso">
<p class="admonition-title">See also</p>
<p><a class="reference internal" href="character_0.html#character-0"><span class="std std-ref">character</span></a></p>
</div>
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