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<h1>stdlib_ascii.fypp
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<h2><span class="anchor" id="src"></span>Source Code</h2>
<div class="hl codehilite"><pre><span></span><a id="ln-1" name="ln-1" href="#ln-1"></a><span class="cp">#:include "common.fypp"</span>
<a id="ln-2" name="ln-2" href="#ln-2"></a>
<a id="ln-3" name="ln-3" href="#ln-3"></a><span class="c">!> The `stdlib_ascii` module provides procedures for handling and manipulating</span>
<a id="ln-4" name="ln-4" href="#ln-4"></a><span class="c">!> intrinsic character variables and constants.</span>
<a id="ln-5" name="ln-5" href="#ln-5"></a><span class="c">!></span>
<a id="ln-6" name="ln-6" href="#ln-6"></a><span class="c">!> The specification of this module is available [here](../page/specs/stdlib_ascii.html).</span>
<a id="ln-7" name="ln-7" href="#ln-7"></a><span class="k">module </span><span class="n">stdlib_ascii</span>
<a id="ln-8" name="ln-8" href="#ln-8"></a><span class="w"> </span><span class="k">use </span><span class="n">stdlib_kinds</span><span class="p">,</span><span class="w"> </span><span class="k">only</span><span class="w"> </span><span class="p">:</span><span class="w"> </span><span class="n">int8</span><span class="p">,</span><span class="w"> </span><span class="n">int16</span><span class="p">,</span><span class="w"> </span><span class="n">int32</span><span class="p">,</span><span class="w"> </span><span class="n">int64</span><span class="p">,</span><span class="w"> </span><span class="n">lk</span><span class="p">,</span><span class="w"> </span><span class="kt">c_bool</span>
<a id="ln-9" name="ln-9" href="#ln-9"></a>
<a id="ln-10" name="ln-10" href="#ln-10"></a><span class="kt"> </span><span class="k">implicit none</span>
<a id="ln-11" name="ln-11" href="#ln-11"></a><span class="k"> private</span>
<a id="ln-12" name="ln-12" href="#ln-12"></a>
<a id="ln-13" name="ln-13" href="#ln-13"></a><span class="w"> </span><span class="c">! Character validation functions</span>
<a id="ln-14" name="ln-14" href="#ln-14"></a><span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">is_alpha</span><span class="p">,</span><span class="w"> </span><span class="n">is_alphanum</span>
<a id="ln-15" name="ln-15" href="#ln-15"></a><span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">is_digit</span><span class="p">,</span><span class="w"> </span><span class="n">is_hex_digit</span><span class="p">,</span><span class="w"> </span><span class="n">is_octal_digit</span>
<a id="ln-16" name="ln-16" href="#ln-16"></a><span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">is_control</span><span class="p">,</span><span class="w"> </span><span class="n">is_white</span><span class="p">,</span><span class="w"> </span><span class="n">is_blank</span>
<a id="ln-17" name="ln-17" href="#ln-17"></a><span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">is_ascii</span><span class="p">,</span><span class="w"> </span><span class="n">is_punctuation</span>
<a id="ln-18" name="ln-18" href="#ln-18"></a><span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">is_graphical</span><span class="p">,</span><span class="w"> </span><span class="n">is_printable</span>
<a id="ln-19" name="ln-19" href="#ln-19"></a><span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">is_lower</span><span class="p">,</span><span class="w"> </span><span class="n">is_upper</span>
<a id="ln-20" name="ln-20" href="#ln-20"></a>
<a id="ln-21" name="ln-21" href="#ln-21"></a><span class="w"> </span><span class="c">! Character conversion functions</span>
<a id="ln-22" name="ln-22" href="#ln-22"></a><span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">to_lower</span><span class="p">,</span><span class="w"> </span><span class="n">to_upper</span><span class="p">,</span><span class="w"> </span><span class="n">to_title</span><span class="p">,</span><span class="w"> </span><span class="n">to_sentence</span><span class="p">,</span><span class="w"> </span><span class="n">reverse</span>
<a id="ln-23" name="ln-23" href="#ln-23"></a>
<a id="ln-24" name="ln-24" href="#ln-24"></a><span class="w"> </span><span class="c">! All control characters in the ASCII table (see www.asciitable.com).</span>
<a id="ln-25" name="ln-25" href="#ln-25"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">NUL</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'00'</span><span class="p">))</span><span class="w"> </span><span class="c">!! Null</span>
<a id="ln-26" name="ln-26" href="#ln-26"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">SOH</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'01'</span><span class="p">))</span><span class="w"> </span><span class="c">!! Start of heading</span>
<a id="ln-27" name="ln-27" href="#ln-27"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">STX</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'02'</span><span class="p">))</span><span class="w"> </span><span class="c">!! Start of text</span>
<a id="ln-28" name="ln-28" href="#ln-28"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">ETX</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'03'</span><span class="p">))</span><span class="w"> </span><span class="c">!! End of text</span>
<a id="ln-29" name="ln-29" href="#ln-29"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">EOT</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'04'</span><span class="p">))</span><span class="w"> </span><span class="c">!! End of transmission</span>
<a id="ln-30" name="ln-30" href="#ln-30"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">ENQ</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'05'</span><span class="p">))</span><span class="w"> </span><span class="c">!! Enquiry</span>
<a id="ln-31" name="ln-31" href="#ln-31"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">ACK</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'06'</span><span class="p">))</span><span class="w"> </span><span class="c">!! Acknowledge</span>
<a id="ln-32" name="ln-32" href="#ln-32"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">BEL</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'07'</span><span class="p">))</span><span class="w"> </span><span class="c">!! Bell</span>
<a id="ln-33" name="ln-33" href="#ln-33"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">BS</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'08'</span><span class="p">))</span><span class="w"> </span><span class="c">!! Backspace</span>
<a id="ln-34" name="ln-34" href="#ln-34"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">TAB</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'09'</span><span class="p">))</span><span class="w"> </span><span class="c">!! Horizontal tab</span>
<a id="ln-35" name="ln-35" href="#ln-35"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">LF</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'0A'</span><span class="p">))</span><span class="w"> </span><span class="c">!! NL line feed, new line</span>
<a id="ln-36" name="ln-36" href="#ln-36"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">VT</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'0B'</span><span class="p">))</span><span class="w"> </span><span class="c">!! Vertical tab</span>
<a id="ln-37" name="ln-37" href="#ln-37"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">FF</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'0C'</span><span class="p">))</span><span class="w"> </span><span class="c">!! NP form feed, new page</span>
<a id="ln-38" name="ln-38" href="#ln-38"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">CR</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'0D'</span><span class="p">))</span><span class="w"> </span><span class="c">!! Carriage return</span>
<a id="ln-39" name="ln-39" href="#ln-39"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">SO</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'0E'</span><span class="p">))</span><span class="w"> </span><span class="c">!! Shift out</span>
<a id="ln-40" name="ln-40" href="#ln-40"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">SI</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'0F'</span><span class="p">))</span><span class="w"> </span><span class="c">!! Shift in</span>
<a id="ln-41" name="ln-41" href="#ln-41"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">DLE</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'10'</span><span class="p">))</span><span class="w"> </span><span class="c">!! Data link escape</span>
<a id="ln-42" name="ln-42" href="#ln-42"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">DC1</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'11'</span><span class="p">))</span><span class="w"> </span><span class="c">!! Device control 1</span>
<a id="ln-43" name="ln-43" href="#ln-43"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">DC2</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'12'</span><span class="p">))</span><span class="w"> </span><span class="c">!! Device control 2</span>
<a id="ln-44" name="ln-44" href="#ln-44"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">DC3</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'13'</span><span class="p">))</span><span class="w"> </span><span class="c">!! Device control 3</span>
<a id="ln-45" name="ln-45" href="#ln-45"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">DC4</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'14'</span><span class="p">))</span><span class="w"> </span><span class="c">!! Device control 4</span>
<a id="ln-46" name="ln-46" href="#ln-46"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">NAK</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'15'</span><span class="p">))</span><span class="w"> </span><span class="c">!! Negative acknowledge</span>
<a id="ln-47" name="ln-47" href="#ln-47"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">SYN</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'16'</span><span class="p">))</span><span class="w"> </span><span class="c">!! Synchronous idle</span>
<a id="ln-48" name="ln-48" href="#ln-48"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">ETB</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'17'</span><span class="p">))</span><span class="w"> </span><span class="c">!! End of transmission block</span>
<a id="ln-49" name="ln-49" href="#ln-49"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">CAN</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'18'</span><span class="p">))</span><span class="w"> </span><span class="c">!! Cancel</span>
<a id="ln-50" name="ln-50" href="#ln-50"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">EM</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'19'</span><span class="p">))</span><span class="w"> </span><span class="c">!! End of medium</span>
<a id="ln-51" name="ln-51" href="#ln-51"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">SUB</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'1A'</span><span class="p">))</span><span class="w"> </span><span class="c">!! Substitute</span>
<a id="ln-52" name="ln-52" href="#ln-52"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">ESC</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'1B'</span><span class="p">))</span><span class="w"> </span><span class="c">!! Escape</span>
<a id="ln-53" name="ln-53" href="#ln-53"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">FS</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'1C'</span><span class="p">))</span><span class="w"> </span><span class="c">!! File separator</span>
<a id="ln-54" name="ln-54" href="#ln-54"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">GS</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'1D'</span><span class="p">))</span><span class="w"> </span><span class="c">!! Group separator</span>
<a id="ln-55" name="ln-55" href="#ln-55"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">RS</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'1E'</span><span class="p">))</span><span class="w"> </span><span class="c">!! Record separator</span>
<a id="ln-56" name="ln-56" href="#ln-56"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">US</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'1F'</span><span class="p">))</span><span class="w"> </span><span class="c">!! Unit separator</span>
<a id="ln-57" name="ln-57" href="#ln-57"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">DEL</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">achar</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'7F'</span><span class="p">))</span><span class="w"> </span><span class="c">!! Delete</span>
<a id="ln-58" name="ln-58" href="#ln-58"></a>
<a id="ln-59" name="ln-59" href="#ln-59"></a><span class="w"> </span><span class="c">! Constant character sequences</span>
<a id="ln-60" name="ln-60" href="#ln-60"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=*</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">fullhex_digits</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">"0123456789ABCDEFabcdef"</span><span class="w"> </span><span class="c">!! 0 .. 9A .. Fa .. f</span>
<a id="ln-61" name="ln-61" href="#ln-61"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=*</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">hex_digits</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">fullhex_digits</span><span class="p">(</span><span class="mi">1</span><span class="p">:</span><span class="mi">16</span><span class="p">)</span><span class="w"> </span><span class="c">!! 0 .. 9A .. F</span>
<a id="ln-62" name="ln-62" href="#ln-62"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=*</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">lowerhex_digits</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">"0123456789abcdef"</span><span class="w"> </span><span class="c">!! 0 .. 9a .. f</span>
<a id="ln-63" name="ln-63" href="#ln-63"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=*</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="nb">digits</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">hex_digits</span><span class="p">(</span><span class="mi">1</span><span class="p">:</span><span class="mi">10</span><span class="p">)</span><span class="w"> </span><span class="c">!! 0 .. 9</span>
<a id="ln-64" name="ln-64" href="#ln-64"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=*</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">octal_digits</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">digits</span><span class="p">(</span><span class="mi">1</span><span class="p">:</span><span class="mi">8</span><span class="p">)</span><span class="w"> </span><span class="c">!! 0 .. 7</span>
<a id="ln-65" name="ln-65" href="#ln-65"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=*</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">letters</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"</span><span class="w"> </span><span class="c">!! A .. Za .. z</span>
<a id="ln-66" name="ln-66" href="#ln-66"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=*</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">uppercase</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">letters</span><span class="p">(</span><span class="mi">1</span><span class="p">:</span><span class="mi">26</span><span class="p">)</span><span class="w"> </span><span class="c">!! A .. Z</span>
<a id="ln-67" name="ln-67" href="#ln-67"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=*</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">lowercase</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">letters</span><span class="p">(</span><span class="mi">27</span><span class="p">:)</span><span class="w"> </span><span class="c">!! a .. z</span>
<a id="ln-68" name="ln-68" href="#ln-68"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=*</span><span class="p">),</span><span class="w"> </span><span class="k">public</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">whitespace</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">" "</span><span class="o">//</span><span class="n">TAB</span><span class="o">//</span><span class="n">VT</span><span class="o">//</span><span class="n">CR</span><span class="o">//</span><span class="n">LF</span><span class="o">//</span><span class="n">FF</span><span class="w"> </span><span class="c">!! ASCII _whitespace</span>
<a id="ln-69" name="ln-69" href="#ln-69"></a>
<a id="ln-70" name="ln-70" href="#ln-70"></a>
<a id="ln-71" name="ln-71" href="#ln-71"></a><span class="w"> </span><span class="c">!> Returns a new character sequence which is the lower case </span>
<a id="ln-72" name="ln-72" href="#ln-72"></a><span class="w"> </span><span class="c">!> version of the input character sequence</span>
<a id="ln-73" name="ln-73" href="#ln-73"></a><span class="w"> </span><span class="c">!> This method is elemental and returns a character sequence</span>
<a id="ln-74" name="ln-74" href="#ln-74"></a><span class="w"> </span><span class="k">interface </span><span class="n">to_lower</span>
<a id="ln-75" name="ln-75" href="#ln-75"></a><span class="w"> </span><span class="k">module procedure</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">to_lower</span>
<a id="ln-76" name="ln-76" href="#ln-76"></a><span class="w"> </span><span class="k">end interface </span><span class="n">to_lower</span>
<a id="ln-77" name="ln-77" href="#ln-77"></a>
<a id="ln-78" name="ln-78" href="#ln-78"></a><span class="w"> </span><span class="c">!> Returns a new character sequence which is the upper case</span>
<a id="ln-79" name="ln-79" href="#ln-79"></a><span class="w"> </span><span class="c">!> version of the input character sequence</span>
<a id="ln-80" name="ln-80" href="#ln-80"></a><span class="w"> </span><span class="c">!> This method is elemental and returns a character sequence</span>
<a id="ln-81" name="ln-81" href="#ln-81"></a><span class="w"> </span><span class="k">interface </span><span class="n">to_upper</span>
<a id="ln-82" name="ln-82" href="#ln-82"></a><span class="w"> </span><span class="k">module procedure</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">to_upper</span>
<a id="ln-83" name="ln-83" href="#ln-83"></a><span class="w"> </span><span class="k">end interface </span><span class="n">to_upper</span>
<a id="ln-84" name="ln-84" href="#ln-84"></a>
<a id="ln-85" name="ln-85" href="#ln-85"></a><span class="w"> </span><span class="c">!> Returns a new character sequence which is the title case</span>
<a id="ln-86" name="ln-86" href="#ln-86"></a><span class="w"> </span><span class="c">!> version of the input character sequence</span>
<a id="ln-87" name="ln-87" href="#ln-87"></a><span class="w"> </span><span class="c">!> This method is elemental and returns a character sequence</span>
<a id="ln-88" name="ln-88" href="#ln-88"></a><span class="w"> </span><span class="k">interface </span><span class="n">to_title</span>
<a id="ln-89" name="ln-89" href="#ln-89"></a><span class="w"> </span><span class="k">module procedure</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">to_title</span>
<a id="ln-90" name="ln-90" href="#ln-90"></a><span class="w"> </span><span class="k">end interface </span><span class="n">to_title</span>
<a id="ln-91" name="ln-91" href="#ln-91"></a>
<a id="ln-92" name="ln-92" href="#ln-92"></a><span class="w"> </span><span class="c">!> Returns a new character sequence which is the sentence case</span>
<a id="ln-93" name="ln-93" href="#ln-93"></a><span class="w"> </span><span class="c">!> version of the input character sequence</span>
<a id="ln-94" name="ln-94" href="#ln-94"></a><span class="w"> </span><span class="c">!> This method is elemental and returns a character sequence</span>
<a id="ln-95" name="ln-95" href="#ln-95"></a><span class="w"> </span><span class="k">interface </span><span class="n">to_sentence</span>
<a id="ln-96" name="ln-96" href="#ln-96"></a><span class="w"> </span><span class="k">module procedure</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">to_sentence</span>
<a id="ln-97" name="ln-97" href="#ln-97"></a><span class="w"> </span><span class="k">end interface </span><span class="n">to_sentence</span>
<a id="ln-98" name="ln-98" href="#ln-98"></a>
<a id="ln-99" name="ln-99" href="#ln-99"></a><span class="w"> </span><span class="c">!> Returns a new character sequence which is reverse of</span>
<a id="ln-100" name="ln-100" href="#ln-100"></a><span class="w"> </span><span class="c">!> the input charater sequence</span>
<a id="ln-101" name="ln-101" href="#ln-101"></a><span class="w"> </span><span class="c">!> This method is elemental and returns a character sequence</span>
<a id="ln-102" name="ln-102" href="#ln-102"></a><span class="w"> </span><span class="k">interface </span><span class="n">reverse</span>
<a id="ln-103" name="ln-103" href="#ln-103"></a><span class="w"> </span><span class="k">module procedure</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">reverse</span>
<a id="ln-104" name="ln-104" href="#ln-104"></a><span class="w"> </span><span class="k">end interface </span><span class="n">reverse</span>
<a id="ln-105" name="ln-105" href="#ln-105"></a><span class="w"> </span>
<a id="ln-106" name="ln-106" href="#ln-106"></a>
<a id="ln-107" name="ln-107" href="#ln-107"></a><span class="k">contains</span>
<a id="ln-108" name="ln-108" href="#ln-108"></a>
<a id="ln-109" name="ln-109" href="#ln-109"></a><span class="w"> </span><span class="c">!> Checks whether `c` is an ASCII letter (A .. Z, a .. z).</span>
<a id="ln-110" name="ln-110" href="#ln-110"></a><span class="w"> </span><span class="k">pure </span><span class="kt">logical </span><span class="k">function </span><span class="n">is_alpha</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>
<a id="ln-111" name="ln-111" href="#ln-111"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">intent</span><span class="p">(</span><span class="n">in</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="c">!! The character to test.</span>
<a id="ln-112" name="ln-112" href="#ln-112"></a><span class="w"> </span><span class="n">is_alpha</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="n">c</span><span class="w"> </span><span class="o">>=</span><span class="w"> </span><span class="s1">'A'</span><span class="w"> </span><span class="p">.</span><span class="nb">and</span><span class="p">.</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="o"><=</span><span class="w"> </span><span class="s1">'Z'</span><span class="p">)</span><span class="w"> </span><span class="p">.</span><span class="nb">or</span><span class="p">.</span><span class="w"> </span><span class="p">(</span><span class="n">c</span><span class="w"> </span><span class="o">>=</span><span class="w"> </span><span class="s1">'a'</span><span class="w"> </span><span class="p">.</span><span class="nb">and</span><span class="p">.</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="o"><=</span><span class="w"> </span><span class="s1">'z'</span><span class="p">)</span>
<a id="ln-113" name="ln-113" href="#ln-113"></a><span class="w"> </span><span class="k">end function</span>
<a id="ln-114" name="ln-114" href="#ln-114"></a>
<a id="ln-115" name="ln-115" href="#ln-115"></a><span class="w"> </span><span class="c">!> Checks whether `c` is a letter or a number (0 .. 9, a .. z, A .. Z).</span>
<a id="ln-116" name="ln-116" href="#ln-116"></a><span class="w"> </span><span class="k">pure </span><span class="kt">logical </span><span class="k">function </span><span class="n">is_alphanum</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>
<a id="ln-117" name="ln-117" href="#ln-117"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">intent</span><span class="p">(</span><span class="n">in</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="c">!! The character to test.</span>
<a id="ln-118" name="ln-118" href="#ln-118"></a><span class="w"> </span><span class="n">is_alphanum</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="n">c</span><span class="w"> </span><span class="o">>=</span><span class="w"> </span><span class="s1">'0'</span><span class="w"> </span><span class="p">.</span><span class="nb">and</span><span class="p">.</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="o"><=</span><span class="w"> </span><span class="s1">'9'</span><span class="p">)</span><span class="w"> </span><span class="p">.</span><span class="nb">or</span><span class="p">.</span><span class="w"> </span><span class="p">(</span><span class="n">c</span><span class="w"> </span><span class="o">>=</span><span class="w"> </span><span class="s1">'a'</span><span class="w"> </span><span class="p">.</span><span class="nb">and</span><span class="p">.</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="o"><=</span><span class="w"> </span><span class="s1">'z'</span><span class="p">)</span><span class="w"> </span><span class="p">&</span>
<a id="ln-119" name="ln-119" href="#ln-119"></a><span class="w"> </span><span class="p">.</span><span class="nb">or</span><span class="p">.</span><span class="w"> </span><span class="p">(</span><span class="n">c</span><span class="w"> </span><span class="o">>=</span><span class="w"> </span><span class="s1">'A'</span><span class="w"> </span><span class="p">.</span><span class="nb">and</span><span class="p">.</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="o"><=</span><span class="w"> </span><span class="s1">'Z'</span><span class="p">)</span>
<a id="ln-120" name="ln-120" href="#ln-120"></a><span class="w"> </span><span class="k">end function</span>
<a id="ln-121" name="ln-121" href="#ln-121"></a>
<a id="ln-122" name="ln-122" href="#ln-122"></a><span class="w"> </span><span class="c">!> Checks whether or not `c` is in the ASCII character set -</span>
<a id="ln-123" name="ln-123" href="#ln-123"></a><span class="w"> </span><span class="c">!> i.e. in the range 0 .. 0x7F.</span>
<a id="ln-124" name="ln-124" href="#ln-124"></a><span class="w"> </span><span class="k">pure </span><span class="kt">logical </span><span class="k">function </span><span class="n">is_ascii</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>
<a id="ln-125" name="ln-125" href="#ln-125"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">intent</span><span class="p">(</span><span class="n">in</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="c">!! The character to test.</span>
<a id="ln-126" name="ln-126" href="#ln-126"></a><span class="w"> </span><span class="n">is_ascii</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">iachar</span><span class="p">(</span><span class="n">c</span><span class="p">)</span><span class="w"> </span><span class="o"><=</span><span class="w"> </span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'7F'</span><span class="p">)</span>
<a id="ln-127" name="ln-127" href="#ln-127"></a><span class="w"> </span><span class="k">end function</span>
<a id="ln-128" name="ln-128" href="#ln-128"></a>
<a id="ln-129" name="ln-129" href="#ln-129"></a><span class="w"> </span><span class="c">!> Checks whether `c` is a control character.</span>
<a id="ln-130" name="ln-130" href="#ln-130"></a><span class="w"> </span><span class="k">pure </span><span class="kt">logical </span><span class="k">function </span><span class="n">is_control</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>
<a id="ln-131" name="ln-131" href="#ln-131"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">intent</span><span class="p">(</span><span class="n">in</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="c">!! The character to test.</span>
<a id="ln-132" name="ln-132" href="#ln-132"></a><span class="w"> </span><span class="kt">integer</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">ic</span>
<a id="ln-133" name="ln-133" href="#ln-133"></a><span class="w"> </span><span class="n">ic</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">iachar</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>
<a id="ln-134" name="ln-134" href="#ln-134"></a><span class="w"> </span><span class="n">is_control</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">ic</span><span class="w"> </span><span class="o"><</span><span class="w"> </span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'20'</span><span class="p">)</span><span class="w"> </span><span class="p">.</span><span class="nb">or</span><span class="p">.</span><span class="w"> </span><span class="n">ic</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'7F'</span><span class="p">)</span>
<a id="ln-135" name="ln-135" href="#ln-135"></a><span class="w"> </span><span class="k">end function</span>
<a id="ln-136" name="ln-136" href="#ln-136"></a>
<a id="ln-137" name="ln-137" href="#ln-137"></a><span class="w"> </span><span class="c">!> Checks whether `c` is a digit (0 .. 9).</span>
<a id="ln-138" name="ln-138" href="#ln-138"></a><span class="w"> </span><span class="k">pure </span><span class="kt">logical </span><span class="k">function </span><span class="n">is_digit</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>
<a id="ln-139" name="ln-139" href="#ln-139"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">intent</span><span class="p">(</span><span class="n">in</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="c">!! The character to test.</span>
<a id="ln-140" name="ln-140" href="#ln-140"></a><span class="w"> </span><span class="n">is_digit</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="s1">'0'</span><span class="w"> </span><span class="o"><=</span><span class="w"> </span><span class="n">c</span><span class="p">)</span><span class="w"> </span><span class="p">.</span><span class="nb">and</span><span class="p">.</span><span class="w"> </span><span class="p">(</span><span class="n">c</span><span class="w"> </span><span class="o"><=</span><span class="w"> </span><span class="s1">'9'</span><span class="p">)</span>
<a id="ln-141" name="ln-141" href="#ln-141"></a><span class="w"> </span><span class="k">end function</span>
<a id="ln-142" name="ln-142" href="#ln-142"></a>
<a id="ln-143" name="ln-143" href="#ln-143"></a><span class="w"> </span><span class="c">!> Checks whether `c` is a digit in base 8 (0 .. 7).</span>
<a id="ln-144" name="ln-144" href="#ln-144"></a><span class="w"> </span><span class="k">pure </span><span class="kt">logical </span><span class="k">function </span><span class="n">is_octal_digit</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>
<a id="ln-145" name="ln-145" href="#ln-145"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">intent</span><span class="p">(</span><span class="n">in</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="c">!! The character to test.</span>
<a id="ln-146" name="ln-146" href="#ln-146"></a><span class="w"> </span><span class="n">is_octal_digit</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="n">c</span><span class="w"> </span><span class="o">>=</span><span class="w"> </span><span class="s1">'0'</span><span class="p">)</span><span class="w"> </span><span class="p">.</span><span class="nb">and</span><span class="p">.</span><span class="w"> </span><span class="p">(</span><span class="n">c</span><span class="w"> </span><span class="o"><=</span><span class="w"> </span><span class="s1">'7'</span><span class="p">);</span>
<a id="ln-147" name="ln-147" href="#ln-147"></a><span class="w"> </span><span class="k">end function</span>
<a id="ln-148" name="ln-148" href="#ln-148"></a>
<a id="ln-149" name="ln-149" href="#ln-149"></a><span class="w"> </span><span class="c">!> Checks whether `c` is a digit in base 16 (0 .. 9, A .. F, a .. f).</span>
<a id="ln-150" name="ln-150" href="#ln-150"></a><span class="w"> </span><span class="k">pure </span><span class="kt">logical </span><span class="k">function </span><span class="n">is_hex_digit</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>
<a id="ln-151" name="ln-151" href="#ln-151"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">intent</span><span class="p">(</span><span class="n">in</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="c">!! The character to test.</span>
<a id="ln-152" name="ln-152" href="#ln-152"></a><span class="w"> </span><span class="n">is_hex_digit</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="n">c</span><span class="w"> </span><span class="o">>=</span><span class="w"> </span><span class="s1">'0'</span><span class="w"> </span><span class="p">.</span><span class="nb">and</span><span class="p">.</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="o"><=</span><span class="w"> </span><span class="s1">'9'</span><span class="p">)</span><span class="w"> </span><span class="p">.</span><span class="nb">or</span><span class="p">.</span><span class="w"> </span><span class="p">(</span><span class="n">c</span><span class="w"> </span><span class="o">>=</span><span class="w"> </span><span class="s1">'a'</span><span class="w"> </span><span class="p">.</span><span class="nb">and</span><span class="p">.</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="o"><=</span><span class="w"> </span><span class="s1">'f'</span><span class="p">)</span><span class="w"> </span><span class="p">&</span>
<a id="ln-153" name="ln-153" href="#ln-153"></a><span class="w"> </span><span class="p">.</span><span class="nb">or</span><span class="p">.</span><span class="w"> </span><span class="p">(</span><span class="n">c</span><span class="w"> </span><span class="o">>=</span><span class="w"> </span><span class="s1">'A'</span><span class="w"> </span><span class="p">.</span><span class="nb">and</span><span class="p">.</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="o"><=</span><span class="w"> </span><span class="s1">'F'</span><span class="p">)</span>
<a id="ln-154" name="ln-154" href="#ln-154"></a><span class="w"> </span><span class="k">end function</span>
<a id="ln-155" name="ln-155" href="#ln-155"></a>
<a id="ln-156" name="ln-156" href="#ln-156"></a><span class="w"> </span><span class="c">!> Checks whether or not `c` is a punctuation character. That includes</span>
<a id="ln-157" name="ln-157" href="#ln-157"></a><span class="w"> </span><span class="c">!> all ASCII characters which are not control characters, letters,</span>
<a id="ln-158" name="ln-158" href="#ln-158"></a><span class="w"> </span><span class="c">!> digits, or whitespace.</span>
<a id="ln-159" name="ln-159" href="#ln-159"></a><span class="w"> </span><span class="k">pure </span><span class="kt">logical </span><span class="k">function </span><span class="n">is_punctuation</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>
<a id="ln-160" name="ln-160" href="#ln-160"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">intent</span><span class="p">(</span><span class="n">in</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="c">!! The character to test.</span>
<a id="ln-161" name="ln-161" href="#ln-161"></a><span class="w"> </span><span class="kt">integer</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">ic</span>
<a id="ln-162" name="ln-162" href="#ln-162"></a><span class="w"> </span><span class="n">ic</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">iachar</span><span class="p">(</span><span class="n">c</span><span class="p">)</span><span class="w"> </span><span class="c">! '~' '!'</span>
<a id="ln-163" name="ln-163" href="#ln-163"></a><span class="w"> </span><span class="n">is_punctuation</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="n">ic</span><span class="w"> </span><span class="o"><=</span><span class="w"> </span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'7E'</span><span class="p">))</span><span class="w"> </span><span class="p">.</span><span class="nb">and</span><span class="p">.</span><span class="w"> </span><span class="p">(</span><span class="n">ic</span><span class="w"> </span><span class="o">>=</span><span class="w"> </span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'21'</span><span class="p">))</span><span class="w"> </span><span class="p">.</span><span class="nb">and</span><span class="p">.</span><span class="w"> </span><span class="p">&</span>
<a id="ln-164" name="ln-164" href="#ln-164"></a><span class="w"> </span><span class="p">(.</span><span class="nb">not</span><span class="p">.</span><span class="w"> </span><span class="n">is_alphanum</span><span class="p">(</span><span class="n">c</span><span class="p">))</span>
<a id="ln-165" name="ln-165" href="#ln-165"></a><span class="w"> </span><span class="k">end function</span>
<a id="ln-166" name="ln-166" href="#ln-166"></a>
<a id="ln-167" name="ln-167" href="#ln-167"></a><span class="w"> </span><span class="c">!> Checks whether or not `c` is a printable character other than the</span>
<a id="ln-168" name="ln-168" href="#ln-168"></a><span class="w"> </span><span class="c">!> space character.</span>
<a id="ln-169" name="ln-169" href="#ln-169"></a><span class="w"> </span><span class="k">pure </span><span class="kt">logical </span><span class="k">function </span><span class="n">is_graphical</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>
<a id="ln-170" name="ln-170" href="#ln-170"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">intent</span><span class="p">(</span><span class="n">in</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="c">!! The character to test.</span>
<a id="ln-171" name="ln-171" href="#ln-171"></a><span class="w"> </span><span class="kt">integer</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">ic</span>
<a id="ln-172" name="ln-172" href="#ln-172"></a><span class="w"> </span><span class="n">ic</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">iachar</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>
<a id="ln-173" name="ln-173" href="#ln-173"></a><span class="w"> </span><span class="c">!The character is graphical if it's between '!' and '~' in the ASCII table,</span>
<a id="ln-174" name="ln-174" href="#ln-174"></a><span class="w"> </span><span class="c">!that is: printable but not a space</span>
<a id="ln-175" name="ln-175" href="#ln-175"></a><span class="w"> </span><span class="n">is_graphical</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'21'</span><span class="p">)</span><span class="w"> </span><span class="o"><=</span><span class="w"> </span><span class="n">ic</span><span class="p">)</span><span class="w"> </span><span class="p">.</span><span class="nb">and</span><span class="p">.</span><span class="w"> </span><span class="p">(</span><span class="n">ic</span><span class="w"> </span><span class="o"><=</span><span class="w"> </span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'7E'</span><span class="p">))</span>
<a id="ln-176" name="ln-176" href="#ln-176"></a><span class="w"> </span><span class="k">end function</span>
<a id="ln-177" name="ln-177" href="#ln-177"></a>
<a id="ln-178" name="ln-178" href="#ln-178"></a><span class="w"> </span><span class="c">!> Checks whether or not `c` is a printable character - including the</span>
<a id="ln-179" name="ln-179" href="#ln-179"></a><span class="w"> </span><span class="c">!> space character.</span>
<a id="ln-180" name="ln-180" href="#ln-180"></a><span class="w"> </span><span class="k">pure </span><span class="kt">logical </span><span class="k">function </span><span class="n">is_printable</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>
<a id="ln-181" name="ln-181" href="#ln-181"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">intent</span><span class="p">(</span><span class="n">in</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="c">!! The character to test.</span>
<a id="ln-182" name="ln-182" href="#ln-182"></a><span class="w"> </span><span class="kt">integer</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">ic</span>
<a id="ln-183" name="ln-183" href="#ln-183"></a><span class="w"> </span><span class="n">ic</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">iachar</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>
<a id="ln-184" name="ln-184" href="#ln-184"></a><span class="w"> </span><span class="c">!The character is printable if it's between ' ' and '~' in the ASCII table</span>
<a id="ln-185" name="ln-185" href="#ln-185"></a><span class="w"> </span><span class="n">is_printable</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">ic</span><span class="w"> </span><span class="o">>=</span><span class="w"> </span><span class="nb">iachar</span><span class="p">(</span><span class="s1">' '</span><span class="p">)</span><span class="w"> </span><span class="p">.</span><span class="nb">and</span><span class="p">.</span><span class="w"> </span><span class="n">ic</span><span class="w"> </span><span class="o"><=</span><span class="w"> </span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'7E'</span><span class="p">)</span>
<a id="ln-186" name="ln-186" href="#ln-186"></a><span class="w"> </span><span class="k">end function</span>
<a id="ln-187" name="ln-187" href="#ln-187"></a>
<a id="ln-188" name="ln-188" href="#ln-188"></a><span class="w"> </span><span class="c">!> Checks whether `c` is a lowercase ASCII letter (a .. z).</span>
<a id="ln-189" name="ln-189" href="#ln-189"></a><span class="w"> </span><span class="k">pure </span><span class="kt">logical </span><span class="k">function </span><span class="n">is_lower</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>
<a id="ln-190" name="ln-190" href="#ln-190"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">intent</span><span class="p">(</span><span class="n">in</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="c">!! The character to test.</span>
<a id="ln-191" name="ln-191" href="#ln-191"></a><span class="w"> </span><span class="kt">integer</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">ic</span>
<a id="ln-192" name="ln-192" href="#ln-192"></a><span class="w"> </span><span class="n">ic</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">iachar</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>
<a id="ln-193" name="ln-193" href="#ln-193"></a><span class="w"> </span><span class="n">is_lower</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">ic</span><span class="w"> </span><span class="o">>=</span><span class="w"> </span><span class="nb">iachar</span><span class="p">(</span><span class="s1">'a'</span><span class="p">)</span><span class="w"> </span><span class="p">.</span><span class="nb">and</span><span class="p">.</span><span class="w"> </span><span class="n">ic</span><span class="w"> </span><span class="o"><=</span><span class="w"> </span><span class="nb">iachar</span><span class="p">(</span><span class="s1">'z'</span><span class="p">)</span>
<a id="ln-194" name="ln-194" href="#ln-194"></a><span class="w"> </span><span class="k">end function</span>
<a id="ln-195" name="ln-195" href="#ln-195"></a>
<a id="ln-196" name="ln-196" href="#ln-196"></a><span class="w"> </span><span class="c">!> Checks whether `c` is an uppercase ASCII letter (A .. Z).</span>
<a id="ln-197" name="ln-197" href="#ln-197"></a><span class="w"> </span><span class="k">pure </span><span class="kt">logical </span><span class="k">function </span><span class="n">is_upper</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>
<a id="ln-198" name="ln-198" href="#ln-198"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">intent</span><span class="p">(</span><span class="n">in</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="c">!! The character to test.</span>
<a id="ln-199" name="ln-199" href="#ln-199"></a><span class="w"> </span><span class="n">is_upper</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="n">c</span><span class="w"> </span><span class="o">>=</span><span class="w"> </span><span class="s1">'A'</span><span class="p">)</span><span class="w"> </span><span class="p">.</span><span class="nb">and</span><span class="p">.</span><span class="w"> </span><span class="p">(</span><span class="n">c</span><span class="w"> </span><span class="o"><=</span><span class="w"> </span><span class="s1">'Z'</span><span class="p">)</span>
<a id="ln-200" name="ln-200" href="#ln-200"></a><span class="w"> </span><span class="k">end function</span>
<a id="ln-201" name="ln-201" href="#ln-201"></a>
<a id="ln-202" name="ln-202" href="#ln-202"></a><span class="w"> </span><span class="c">!> Checks whether or not `c` is a whitespace character. That includes the</span>
<a id="ln-203" name="ln-203" href="#ln-203"></a><span class="w"> </span><span class="c">!> space, tab, vertical tab, form feed, carriage return, and linefeed</span>
<a id="ln-204" name="ln-204" href="#ln-204"></a><span class="w"> </span><span class="c">!> characters.</span>
<a id="ln-205" name="ln-205" href="#ln-205"></a><span class="w"> </span><span class="k">pure </span><span class="kt">logical </span><span class="k">function </span><span class="n">is_white</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>
<a id="ln-206" name="ln-206" href="#ln-206"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">intent</span><span class="p">(</span><span class="n">in</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="c">!! The character to test.</span>
<a id="ln-207" name="ln-207" href="#ln-207"></a><span class="w"> </span><span class="kt">integer</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">ic</span>
<a id="ln-208" name="ln-208" href="#ln-208"></a><span class="w"> </span><span class="n">ic</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">iachar</span><span class="p">(</span><span class="n">c</span><span class="p">)</span><span class="w"> </span><span class="c">! TAB, LF, VT, FF, CR</span>
<a id="ln-209" name="ln-209" href="#ln-209"></a><span class="w"> </span><span class="n">is_white</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="n">c</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="s1">' '</span><span class="p">)</span><span class="w"> </span><span class="p">.</span><span class="nb">or</span><span class="p">.</span><span class="w"> </span><span class="p">(</span><span class="n">ic</span><span class="w"> </span><span class="o">>=</span><span class="w"> </span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'09'</span><span class="p">)</span><span class="w"> </span><span class="p">.</span><span class="nb">and</span><span class="p">.</span><span class="w"> </span><span class="n">ic</span><span class="w"> </span><span class="o"><=</span><span class="w"> </span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'0D'</span><span class="p">));</span>
<a id="ln-210" name="ln-210" href="#ln-210"></a><span class="w"> </span><span class="k">end function</span>
<a id="ln-211" name="ln-211" href="#ln-211"></a>
<a id="ln-212" name="ln-212" href="#ln-212"></a><span class="w"> </span><span class="c">!> Checks whether or not `c` is a blank character. That includes the</span>
<a id="ln-213" name="ln-213" href="#ln-213"></a><span class="w"> </span><span class="c">!> only the space and tab characters</span>
<a id="ln-214" name="ln-214" href="#ln-214"></a><span class="w"> </span><span class="k">pure </span><span class="kt">logical </span><span class="k">function </span><span class="n">is_blank</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>
<a id="ln-215" name="ln-215" href="#ln-215"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">intent</span><span class="p">(</span><span class="n">in</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="c">!! The character to test.</span>
<a id="ln-216" name="ln-216" href="#ln-216"></a><span class="w"> </span><span class="kt">integer</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">ic</span>
<a id="ln-217" name="ln-217" href="#ln-217"></a><span class="w"> </span><span class="n">ic</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">iachar</span><span class="p">(</span><span class="n">c</span><span class="p">)</span><span class="w"> </span><span class="c">! TAB</span>
<a id="ln-218" name="ln-218" href="#ln-218"></a><span class="w"> </span><span class="n">is_blank</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="n">c</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="s1">' '</span><span class="p">)</span><span class="w"> </span><span class="p">.</span><span class="nb">or</span><span class="p">.</span><span class="w"> </span><span class="p">(</span><span class="n">ic</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="nb">int</span><span class="p">(</span><span class="n">z</span><span class="s1">'09'</span><span class="p">));</span>
<a id="ln-219" name="ln-219" href="#ln-219"></a><span class="w"> </span><span class="k">end function</span>
<a id="ln-220" name="ln-220" href="#ln-220"></a>
<a id="ln-221" name="ln-221" href="#ln-221"></a><span class="w"> </span><span class="c">!> Returns the corresponding lowercase letter, if `c` is an uppercase</span>
<a id="ln-222" name="ln-222" href="#ln-222"></a><span class="w"> </span><span class="c">!> ASCII character, otherwise `c` itself.</span>
<a id="ln-223" name="ln-223" href="#ln-223"></a><span class="w"> </span><span class="k">elemental function </span><span class="n">char_to_lower</span><span class="p">(</span><span class="n">c</span><span class="p">)</span><span class="w"> </span><span class="k">result</span><span class="p">(</span><span class="n">t</span><span class="p">)</span>
<a id="ln-224" name="ln-224" href="#ln-224"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">intent</span><span class="p">(</span><span class="n">in</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="c">!! A character.</span>
<a id="ln-225" name="ln-225" href="#ln-225"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">t</span>
<a id="ln-226" name="ln-226" href="#ln-226"></a><span class="w"> </span><span class="kt">integer</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">wp</span><span class="o">=</span><span class="w"> </span><span class="nb">iachar</span><span class="p">(</span><span class="s1">'a'</span><span class="p">)</span><span class="o">-</span><span class="nb">iachar</span><span class="p">(</span><span class="s1">'A'</span><span class="p">),</span><span class="w"> </span><span class="n">BA</span><span class="o">=</span><span class="nb">iachar</span><span class="p">(</span><span class="s1">'A'</span><span class="p">),</span><span class="w"> </span><span class="n">BZ</span><span class="o">=</span><span class="nb">iachar</span><span class="p">(</span><span class="s1">'Z'</span><span class="p">)</span>
<a id="ln-227" name="ln-227" href="#ln-227"></a><span class="w"> </span><span class="kt">integer</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">k</span>
<a id="ln-228" name="ln-228" href="#ln-228"></a><span class="w"> </span><span class="c">!Check whether the integer equivalent is between BA=65 and BZ=90</span>
<a id="ln-229" name="ln-229" href="#ln-229"></a><span class="w"> </span><span class="n">k</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">ichar</span><span class="p">(</span><span class="n">c</span><span class="p">)</span><span class="w"> </span>
<a id="ln-230" name="ln-230" href="#ln-230"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">k</span><span class="o">>=</span><span class="n">BA</span><span class="p">.</span><span class="nb">and</span><span class="p">.</span><span class="n">k</span><span class="o"><=</span><span class="n">BZ</span><span class="p">)</span><span class="w"> </span><span class="n">k</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">k</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">wp</span><span class="w"> </span>
<a id="ln-231" name="ln-231" href="#ln-231"></a><span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">char</span><span class="p">(</span><span class="n">k</span><span class="p">)</span>
<a id="ln-232" name="ln-232" href="#ln-232"></a>
<a id="ln-233" name="ln-233" href="#ln-233"></a><span class="w"> </span><span class="k">end function </span><span class="n">char_to_lower</span>
<a id="ln-234" name="ln-234" href="#ln-234"></a>
<a id="ln-235" name="ln-235" href="#ln-235"></a><span class="w"> </span><span class="c">!> Returns the corresponding uppercase letter, if `c` is a lowercase</span>
<a id="ln-236" name="ln-236" href="#ln-236"></a><span class="w"> </span><span class="c">!> ASCII character, otherwise `c` itself.</span>
<a id="ln-237" name="ln-237" href="#ln-237"></a><span class="w"> </span><span class="k">elemental function </span><span class="n">char_to_upper</span><span class="p">(</span><span class="n">c</span><span class="p">)</span><span class="w"> </span><span class="k">result</span><span class="p">(</span><span class="n">t</span><span class="p">)</span>
<a id="ln-238" name="ln-238" href="#ln-238"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="k">intent</span><span class="p">(</span><span class="n">in</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="c">!! A character.</span>
<a id="ln-239" name="ln-239" href="#ln-239"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">t</span>
<a id="ln-240" name="ln-240" href="#ln-240"></a><span class="w"> </span><span class="kt">integer</span><span class="p">,</span><span class="w"> </span><span class="k">parameter</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">wp</span><span class="o">=</span><span class="w"> </span><span class="nb">iachar</span><span class="p">(</span><span class="s1">'a'</span><span class="p">)</span><span class="o">-</span><span class="nb">iachar</span><span class="p">(</span><span class="s1">'A'</span><span class="p">),</span><span class="w"> </span><span class="n">la</span><span class="o">=</span><span class="nb">iachar</span><span class="p">(</span><span class="s1">'a'</span><span class="p">),</span><span class="w"> </span><span class="n">lz</span><span class="o">=</span><span class="nb">iachar</span><span class="p">(</span><span class="s1">'z'</span><span class="p">)</span>
<a id="ln-241" name="ln-241" href="#ln-241"></a><span class="w"> </span><span class="kt">integer</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">k</span>
<a id="ln-242" name="ln-242" href="#ln-242"></a><span class="w"> </span><span class="c">!Check whether the integer equivalent is between la=97 and lz=122</span>
<a id="ln-243" name="ln-243" href="#ln-243"></a><span class="w"> </span><span class="n">k</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">ichar</span><span class="p">(</span><span class="n">c</span><span class="p">)</span><span class="w"> </span>
<a id="ln-244" name="ln-244" href="#ln-244"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">k</span><span class="o">>=</span><span class="n">la</span><span class="p">.</span><span class="nb">and</span><span class="p">.</span><span class="n">k</span><span class="o"><=</span><span class="n">lz</span><span class="p">)</span><span class="w"> </span><span class="n">k</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">k</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="n">wp</span><span class="w"> </span>
<a id="ln-245" name="ln-245" href="#ln-245"></a><span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">char</span><span class="p">(</span><span class="n">k</span><span class="p">)</span>
<a id="ln-246" name="ln-246" href="#ln-246"></a>
<a id="ln-247" name="ln-247" href="#ln-247"></a><span class="w"> </span><span class="k">end function </span><span class="n">char_to_upper</span>
<a id="ln-248" name="ln-248" href="#ln-248"></a>
<a id="ln-249" name="ln-249" href="#ln-249"></a><span class="w"> </span><span class="c">!> Convert character variable to lower case</span>
<a id="ln-250" name="ln-250" href="#ln-250"></a><span class="w"> </span><span class="c">!> ([Specification](../page/specs/stdlib_ascii.html#to_lower))</span>
<a id="ln-251" name="ln-251" href="#ln-251"></a><span class="w"> </span><span class="c">!></span>
<a id="ln-252" name="ln-252" href="#ln-252"></a><span class="w"> </span><span class="c">!> Version: experimental</span>
<a id="ln-253" name="ln-253" href="#ln-253"></a><span class="w"> </span><span class="k">elemental function </span><span class="n">to_lower</span><span class="p">(</span><span class="n">string</span><span class="p">)</span><span class="w"> </span><span class="k">result</span><span class="p">(</span><span class="n">lower_string</span><span class="p">)</span>
<a id="ln-254" name="ln-254" href="#ln-254"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=*</span><span class="p">),</span><span class="w"> </span><span class="k">intent</span><span class="p">(</span><span class="n">in</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">string</span>
<a id="ln-255" name="ln-255" href="#ln-255"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="nb">len</span><span class="p">(</span><span class="n">string</span><span class="p">))</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">lower_string</span>
<a id="ln-256" name="ln-256" href="#ln-256"></a><span class="w"> </span><span class="kt">integer</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">i</span>
<a id="ln-257" name="ln-257" href="#ln-257"></a>
<a id="ln-258" name="ln-258" href="#ln-258"></a><span class="w"> </span><span class="k">do </span><span class="n">i</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="nb">len</span><span class="p">(</span><span class="n">string</span><span class="p">)</span>
<a id="ln-259" name="ln-259" href="#ln-259"></a><span class="w"> </span><span class="n">lower_string</span><span class="p">(</span><span class="n">i</span><span class="p">:</span><span class="n">i</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">char_to_lower</span><span class="p">(</span><span class="n">string</span><span class="p">(</span><span class="n">i</span><span class="p">:</span><span class="n">i</span><span class="p">))</span>
<a id="ln-260" name="ln-260" href="#ln-260"></a><span class="w"> </span><span class="k">end do</span>
<a id="ln-261" name="ln-261" href="#ln-261"></a>
<a id="ln-262" name="ln-262" href="#ln-262"></a><span class="k"> end function </span><span class="n">to_lower</span>
<a id="ln-263" name="ln-263" href="#ln-263"></a>
<a id="ln-264" name="ln-264" href="#ln-264"></a><span class="w"> </span><span class="c">!> Convert character variable to upper case</span>
<a id="ln-265" name="ln-265" href="#ln-265"></a><span class="w"> </span><span class="c">!> ([Specification](../page/specs/stdlib_ascii.html#to_upper))</span>
<a id="ln-266" name="ln-266" href="#ln-266"></a><span class="w"> </span><span class="c">!></span>
<a id="ln-267" name="ln-267" href="#ln-267"></a><span class="w"> </span><span class="c">!> Version: experimental</span>
<a id="ln-268" name="ln-268" href="#ln-268"></a><span class="w"> </span><span class="k">elemental function </span><span class="n">to_upper</span><span class="p">(</span><span class="n">string</span><span class="p">)</span><span class="w"> </span><span class="k">result</span><span class="p">(</span><span class="n">upper_string</span><span class="p">)</span>
<a id="ln-269" name="ln-269" href="#ln-269"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=*</span><span class="p">),</span><span class="w"> </span><span class="k">intent</span><span class="p">(</span><span class="n">in</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">string</span>
<a id="ln-270" name="ln-270" href="#ln-270"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="nb">len</span><span class="p">(</span><span class="n">string</span><span class="p">))</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">upper_string</span>
<a id="ln-271" name="ln-271" href="#ln-271"></a><span class="w"> </span><span class="kt">integer</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">i</span>
<a id="ln-272" name="ln-272" href="#ln-272"></a>
<a id="ln-273" name="ln-273" href="#ln-273"></a><span class="w"> </span><span class="k">do </span><span class="n">i</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="nb">len</span><span class="p">(</span><span class="n">string</span><span class="p">)</span>
<a id="ln-274" name="ln-274" href="#ln-274"></a><span class="w"> </span><span class="n">upper_string</span><span class="p">(</span><span class="n">i</span><span class="p">:</span><span class="n">i</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">char_to_upper</span><span class="p">(</span><span class="n">string</span><span class="p">(</span><span class="n">i</span><span class="p">:</span><span class="n">i</span><span class="p">))</span>
<a id="ln-275" name="ln-275" href="#ln-275"></a><span class="w"> </span><span class="k">end do</span>
<a id="ln-276" name="ln-276" href="#ln-276"></a>
<a id="ln-277" name="ln-277" href="#ln-277"></a><span class="k"> end function </span><span class="n">to_upper</span>
<a id="ln-278" name="ln-278" href="#ln-278"></a>
<a id="ln-279" name="ln-279" href="#ln-279"></a><span class="w"> </span><span class="c">!> Converts character sequence to title case</span>
<a id="ln-280" name="ln-280" href="#ln-280"></a><span class="w"> </span><span class="c">!> ([Specification](../page/specs/stdlib_ascii.html#to_title))</span>
<a id="ln-281" name="ln-281" href="#ln-281"></a><span class="w"> </span><span class="c">!></span>
<a id="ln-282" name="ln-282" href="#ln-282"></a><span class="w"> </span><span class="c">!> Version: experimental</span>
<a id="ln-283" name="ln-283" href="#ln-283"></a><span class="w"> </span><span class="k">elemental function </span><span class="n">to_title</span><span class="p">(</span><span class="n">string</span><span class="p">)</span><span class="w"> </span><span class="k">result</span><span class="p">(</span><span class="n">title_string</span><span class="p">)</span>
<a id="ln-284" name="ln-284" href="#ln-284"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=*</span><span class="p">),</span><span class="w"> </span><span class="k">intent</span><span class="p">(</span><span class="n">in</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">string</span>
<a id="ln-285" name="ln-285" href="#ln-285"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="nb">len</span><span class="p">(</span><span class="n">string</span><span class="p">))</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">title_string</span>
<a id="ln-286" name="ln-286" href="#ln-286"></a><span class="w"> </span><span class="kt">integer</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">i</span>
<a id="ln-287" name="ln-287" href="#ln-287"></a><span class="w"> </span><span class="kt">logical</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">capitalize_switch</span>
<a id="ln-288" name="ln-288" href="#ln-288"></a>
<a id="ln-289" name="ln-289" href="#ln-289"></a><span class="w"> </span><span class="n">capitalize_switch</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">.</span><span class="n">true</span><span class="p">.</span>
<a id="ln-290" name="ln-290" href="#ln-290"></a><span class="w"> </span><span class="k">do </span><span class="n">i</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="nb">len</span><span class="p">(</span><span class="n">string</span><span class="p">)</span>
<a id="ln-291" name="ln-291" href="#ln-291"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">is_alphanum</span><span class="p">(</span><span class="n">string</span><span class="p">(</span><span class="n">i</span><span class="p">:</span><span class="n">i</span><span class="p">)))</span><span class="w"> </span><span class="k">then</span>
<a id="ln-292" name="ln-292" href="#ln-292"></a><span class="k"> if</span><span class="w"> </span><span class="p">(</span><span class="n">capitalize_switch</span><span class="p">)</span><span class="w"> </span><span class="k">then</span>
<a id="ln-293" name="ln-293" href="#ln-293"></a><span class="k"> </span><span class="n">title_string</span><span class="p">(</span><span class="n">i</span><span class="p">:</span><span class="n">i</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">char_to_upper</span><span class="p">(</span><span class="n">string</span><span class="p">(</span><span class="n">i</span><span class="p">:</span><span class="n">i</span><span class="p">))</span>
<a id="ln-294" name="ln-294" href="#ln-294"></a><span class="w"> </span><span class="n">capitalize_switch</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">.</span><span class="n">false</span><span class="p">.</span>
<a id="ln-295" name="ln-295" href="#ln-295"></a><span class="w"> </span><span class="k">else</span>
<a id="ln-296" name="ln-296" href="#ln-296"></a><span class="k"> </span><span class="n">title_string</span><span class="p">(</span><span class="n">i</span><span class="p">:</span><span class="n">i</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">char_to_lower</span><span class="p">(</span><span class="n">string</span><span class="p">(</span><span class="n">i</span><span class="p">:</span><span class="n">i</span><span class="p">))</span>
<a id="ln-297" name="ln-297" href="#ln-297"></a><span class="w"> </span><span class="k">end if</span>
<a id="ln-298" name="ln-298" href="#ln-298"></a><span class="k"> else</span>
<a id="ln-299" name="ln-299" href="#ln-299"></a><span class="k"> </span><span class="n">title_string</span><span class="p">(</span><span class="n">i</span><span class="p">:</span><span class="n">i</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">string</span><span class="p">(</span><span class="n">i</span><span class="p">:</span><span class="n">i</span><span class="p">)</span>
<a id="ln-300" name="ln-300" href="#ln-300"></a><span class="w"> </span><span class="n">capitalize_switch</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">.</span><span class="n">true</span><span class="p">.</span>
<a id="ln-301" name="ln-301" href="#ln-301"></a><span class="w"> </span><span class="k">end if</span>
<a id="ln-302" name="ln-302" href="#ln-302"></a><span class="k"> end do</span>
<a id="ln-303" name="ln-303" href="#ln-303"></a>
<a id="ln-304" name="ln-304" href="#ln-304"></a><span class="k"> end function </span><span class="n">to_title</span>
<a id="ln-305" name="ln-305" href="#ln-305"></a>
<a id="ln-306" name="ln-306" href="#ln-306"></a><span class="w"> </span><span class="c">!> Converts character sequence to sentence case</span>
<a id="ln-307" name="ln-307" href="#ln-307"></a><span class="w"> </span><span class="c">!> ([Specification](../page/specs/stdlib_ascii.html#to_sentence))</span>
<a id="ln-308" name="ln-308" href="#ln-308"></a><span class="w"> </span><span class="c">!></span>
<a id="ln-309" name="ln-309" href="#ln-309"></a><span class="w"> </span><span class="c">!> Version: experimental</span>
<a id="ln-310" name="ln-310" href="#ln-310"></a><span class="w"> </span><span class="k">elemental function </span><span class="n">to_sentence</span><span class="p">(</span><span class="n">string</span><span class="p">)</span><span class="w"> </span><span class="k">result</span><span class="p">(</span><span class="n">sentence_string</span><span class="p">)</span>
<a id="ln-311" name="ln-311" href="#ln-311"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=*</span><span class="p">),</span><span class="w"> </span><span class="k">intent</span><span class="p">(</span><span class="n">in</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">string</span>
<a id="ln-312" name="ln-312" href="#ln-312"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="nb">len</span><span class="p">(</span><span class="n">string</span><span class="p">))</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">sentence_string</span>
<a id="ln-313" name="ln-313" href="#ln-313"></a><span class="w"> </span><span class="kt">integer</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">i</span><span class="p">,</span><span class="w"> </span><span class="n">n</span>
<a id="ln-314" name="ln-314" href="#ln-314"></a>
<a id="ln-315" name="ln-315" href="#ln-315"></a><span class="w"> </span><span class="n">n</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">len</span><span class="p">(</span><span class="n">string</span><span class="p">)</span>
<a id="ln-316" name="ln-316" href="#ln-316"></a><span class="w"> </span><span class="k">do </span><span class="n">i</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="nb">len</span><span class="p">(</span><span class="n">string</span><span class="p">)</span>
<a id="ln-317" name="ln-317" href="#ln-317"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">is_alphanum</span><span class="p">(</span><span class="n">string</span><span class="p">(</span><span class="n">i</span><span class="p">:</span><span class="n">i</span><span class="p">)))</span><span class="w"> </span><span class="k">then</span>
<a id="ln-318" name="ln-318" href="#ln-318"></a><span class="k"> </span><span class="n">sentence_string</span><span class="p">(</span><span class="n">i</span><span class="p">:</span><span class="n">i</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">char_to_upper</span><span class="p">(</span><span class="n">string</span><span class="p">(</span><span class="n">i</span><span class="p">:</span><span class="n">i</span><span class="p">))</span>
<a id="ln-319" name="ln-319" href="#ln-319"></a><span class="w"> </span><span class="n">n</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">i</span>
<a id="ln-320" name="ln-320" href="#ln-320"></a><span class="w"> </span><span class="k">exit</span>
<a id="ln-321" name="ln-321" href="#ln-321"></a><span class="k"> else</span>
<a id="ln-322" name="ln-322" href="#ln-322"></a><span class="k"> </span><span class="n">sentence_string</span><span class="p">(</span><span class="n">i</span><span class="p">:</span><span class="n">i</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">string</span><span class="p">(</span><span class="n">i</span><span class="p">:</span><span class="n">i</span><span class="p">)</span>
<a id="ln-323" name="ln-323" href="#ln-323"></a><span class="w"> </span><span class="k">end if</span>
<a id="ln-324" name="ln-324" href="#ln-324"></a><span class="k"> end do</span>
<a id="ln-325" name="ln-325" href="#ln-325"></a>
<a id="ln-326" name="ln-326" href="#ln-326"></a><span class="k"> do </span><span class="n">i</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">n</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="nb">len</span><span class="p">(</span><span class="n">string</span><span class="p">)</span>
<a id="ln-327" name="ln-327" href="#ln-327"></a><span class="w"> </span><span class="n">sentence_string</span><span class="p">(</span><span class="n">i</span><span class="p">:</span><span class="n">i</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">char_to_lower</span><span class="p">(</span><span class="n">string</span><span class="p">(</span><span class="n">i</span><span class="p">:</span><span class="n">i</span><span class="p">))</span>
<a id="ln-328" name="ln-328" href="#ln-328"></a><span class="w"> </span><span class="k">end do</span>
<a id="ln-329" name="ln-329" href="#ln-329"></a>
<a id="ln-330" name="ln-330" href="#ln-330"></a><span class="k"> end function </span><span class="n">to_sentence</span>
<a id="ln-331" name="ln-331" href="#ln-331"></a>
<a id="ln-332" name="ln-332" href="#ln-332"></a><span class="w"> </span><span class="c">!> Reverse the character order in the input character variable</span>
<a id="ln-333" name="ln-333" href="#ln-333"></a><span class="w"> </span><span class="c">!> ([Specification](../page/specs/stdlib_ascii.html#reverse))</span>
<a id="ln-334" name="ln-334" href="#ln-334"></a><span class="w"> </span><span class="c">!></span>
<a id="ln-335" name="ln-335" href="#ln-335"></a><span class="w"> </span><span class="c">!> Version: experimental</span>
<a id="ln-336" name="ln-336" href="#ln-336"></a><span class="w"> </span><span class="k">elemental function </span><span class="n">reverse</span><span class="p">(</span><span class="n">string</span><span class="p">)</span><span class="w"> </span><span class="k">result</span><span class="p">(</span><span class="n">reverse_string</span><span class="p">)</span>
<a id="ln-337" name="ln-337" href="#ln-337"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=*</span><span class="p">),</span><span class="w"> </span><span class="k">intent</span><span class="p">(</span><span class="n">in</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">string</span>
<a id="ln-338" name="ln-338" href="#ln-338"></a><span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="nb">len</span><span class="p">(</span><span class="n">string</span><span class="p">))</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">reverse_string</span>
<a id="ln-339" name="ln-339" href="#ln-339"></a><span class="w"> </span><span class="kt">integer</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">i</span><span class="p">,</span><span class="w"> </span><span class="n">n</span>
<a id="ln-340" name="ln-340" href="#ln-340"></a>
<a id="ln-341" name="ln-341" href="#ln-341"></a><span class="w"> </span><span class="n">n</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">len</span><span class="p">(</span><span class="n">string</span><span class="p">)</span>
<a id="ln-342" name="ln-342" href="#ln-342"></a><span class="w"> </span><span class="k">do </span><span class="n">i</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="n">n</span>
<a id="ln-343" name="ln-343" href="#ln-343"></a><span class="w"> </span><span class="n">reverse_string</span><span class="p">(</span><span class="n">n</span><span class="o">-</span><span class="n">i</span><span class="o">+</span><span class="mi">1</span><span class="p">:</span><span class="n">n</span><span class="o">-</span><span class="n">i</span><span class="o">+</span><span class="mi">1</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">string</span><span class="p">(</span><span class="n">i</span><span class="p">:</span><span class="n">i</span><span class="p">)</span>
<a id="ln-344" name="ln-344" href="#ln-344"></a><span class="w"> </span><span class="k">end do</span>
<a id="ln-345" name="ln-345" href="#ln-345"></a>
<a id="ln-346" name="ln-346" href="#ln-346"></a><span class="k"> end function </span><span class="n">reverse</span>
<a id="ln-347" name="ln-347" href="#ln-347"></a>
<a id="ln-348" name="ln-348" href="#ln-348"></a><span class="k">end module </span><span class="n">stdlib_ascii</span>
</pre></div>
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