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<!DOCTYPE html>
<html lang="en">
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   <meta name="description" content="command line parsing">
    <meta name="author" content="John S. Urban" >
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    <title>demo11 &ndash; M_CLI2</title>

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    <h1>demo11      <small>Program</small>
      
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               title=" 4.6% of total for programs.">39 statements</a>
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                <li><a href="https://gcc.gnu.org/onlinedocs/gfortran/ISO_005fFORTRAN_005fENV.html">iso_fortran_env</a></li>
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    <p>@(#) examples of validating values with ALL(3f) and ANY(3f)</p>
<br>
     <section class="visible-xs visible-sm hidden-md">
         <h3>Contents</h3>
  
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            <a class="list-group-item" href="../program/demo11.html#variable-dot">dot</a>
            <a class="list-group-item" href="../program/demo11.html#variable-i~4">i</a>
            <a class="list-group-item" href="../program/demo11.html#variable-list">list</a>
            <a class="list-group-item" href="../program/demo11.html#variable-name~3">name</a>
            <a class="list-group-item" href="../program/demo11.html#variable-readme">readme</a>
            <a class="list-group-item" href="../program/demo11.html#variable-string~11">string</a>
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     </section>
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    <section>
    <h2>Variables</h2>
      <table class="table table-striped varlist">
    <thead>
      <tr>
        <th>Type</th>
        <th>Attributes</th>
        <th></th>
        <th>Name</th>
<th></th><th>Initial</th>        <th></th>
    </thead>
    <tbody>
        <tr>
            <td>
              <span class="anchor" id="variable-dot"></span>
              type(<a href='../type/point.html'>point</a>)
            </td>
            <td>
              
            </td>
            <td>::</td>
            <td><strong>dot</strong></td>
                <td></td>
                <td></td>
            <td>
                
            </td>
        </tr>
        <tr>
            <td>
              <span class="anchor" id="variable-i~4"></span>
              integer
            </td>
            <td>
              
            </td>
            <td>::</td>
            <td><strong>i</strong></td>
                <td></td>
                <td></td>
            <td>
                
            </td>
        </tr>
        <tr>
            <td>
              <span class="anchor" id="variable-list"></span>
              character(len=:),
            </td>
            <td>
              allocatable
            </td>
            <td>::</td>
            <td><strong>list</strong>(:)</td>
                <td></td>
                <td></td>
            <td>
                
            </td>
        </tr>
        <tr>
            <td>
              <span class="anchor" id="variable-name~3"></span>
              character(len=:),
            </td>
            <td>
              allocatable
            </td>
            <td>::</td>
            <td><strong>name</strong></td>
                <td></td>
                <td></td>
            <td>
                
            </td>
        </tr>
        <tr>
            <td>
              <span class="anchor" id="variable-readme"></span>
              character(len=80)
            </td>
            <td>
              
            </td>
            <td>::</td>
            <td><strong>readme</strong></td>
                <td></td>
                <td></td>
            <td>
                
            </td>
        </tr>
        <tr>
            <td>
              <span class="anchor" id="variable-string~11"></span>
              character(len=:),
            </td>
            <td>
              allocatable
            </td>
            <td>::</td>
            <td><strong>string</strong></td>
                <td></td>
                <td></td>
            <td>
                
            </td>
        </tr>
    </tbody>
  </table>

    </section>
    <br>
    
    
    

    <section>
   <h2>Derived Types</h2>
       <div class="panel panel-default">
    <div class="panel-heading codesum">
      <span class="anchor" id="type-point"></span>
      <h3>
        type&nbsp;::&nbsp;
        <a href='../type/point.html'>point</a>
        
      </h3>
    </div>
    <div class="panel-body">
      

        <h4>Components</h4>
          <table class="table table-striped varlist">
    <thead>
      <tr>
        <th>Type</th>
<th>Visibility</th>        <th>Attributes</th>
        <th></th>
        <th>Name</th>
<th></th><th>Initial</th>        <th></th>
    </thead>
    <tbody>
        <tr>
            <td>
              <span class="anchor" id="variable-color"></span>
              character(len=20),
            </td>
              <td>public</td>
            <td>
              
            </td>
            <td>::</td>
            <td><strong>color</strong></td>
<td> =</td>
                <td>'red'</td>
            <td>

            </td>
        </tr>
        <tr>
            <td>
              <span class="anchor" id="variable-x"></span>
              integer,
            </td>
              <td>public</td>
            <td>
              
            </td>
            <td>::</td>
            <td><strong>x</strong></td>
<td> =</td>
                <td>0</td>
            <td>

            </td>
        </tr>
        <tr>
            <td>
              <span class="anchor" id="variable-y"></span>
              integer,
            </td>
              <td>public</td>
            <td>
              
            </td>
            <td>::</td>
            <td><strong>y</strong></td>
<td> =</td>
                <td>0</td>
            <td>

            </td>
        </tr>
    </tbody>
  </table>




    </div>
  </div>

    </section>
   <br>
    


    
    <section>
    <h2 id="src">Source Code</h2>
    <div class="highlight"><pre><span></span><span class="k">program </span><span class="n">demo11</span><span class="w"></span>
<span class="c">!! @(#) examples of validating values with ALL(3f) and ANY(3f)</span>
<span class="k">use</span><span class="p">,</span><span class="w"> </span><span class="k">intrinsic</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">iso_fortran_env</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">stderr</span><span class="o">=&gt;</span><span class="n">ERROR_UNIT</span><span class="p">,</span><span class="w"> </span><span class="n">stdin</span><span class="o">=&gt;</span><span class="n">INPUT_UNIT</span><span class="p">,</span><span class="w"> </span><span class="n">stdout</span><span class="o">=&gt;</span><span class="n">OUTPUT_UNIT</span><span class="w"></span>
<span class="k">implicit none</span>
<span class="k">type </span><span class="n">point</span><span class="w"></span>
<span class="w">   </span><span class="kt">integer</span><span class="w">           </span><span class="kd">::</span><span class="w"> </span><span class="n">x</span><span class="o">=</span><span class="mi">0</span><span class="w"></span>
<span class="w">   </span><span class="kt">integer</span><span class="w">           </span><span class="kd">::</span><span class="w"> </span><span class="n">y</span><span class="o">=</span><span class="mi">0</span><span class="w"></span>
<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">20</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">color</span><span class="o">=</span><span class="s1">&#39;red&#39;</span><span class="w"></span>
<span class="k">endtype </span><span class="n">point</span><span class="w"></span>

<span class="k">type</span><span class="p">(</span><span class="n">point</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">dot</span><span class="p">;</span><span class="w"> </span><span class="k">namelist</span><span class="w"> </span><span class="o">/</span><span class="n">nml_dot</span><span class="o">/</span><span class="w"> </span><span class="n">dot</span><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="k">allocatable</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">name</span><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="k">allocatable</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">string</span><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="k">allocatable</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">list</span><span class="p">(:)</span><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">80</span><span class="p">)</span><span class="w">            </span><span class="kd">::</span><span class="w"> </span><span class="n">readme</span><span class="w"> </span><span class="c">!(3)</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="w"></span>

<span class="k">print</span><span class="w"> </span><span class="o">*</span><span class="p">,</span><span class="s1">&#39;demo11: examples of validating values with ALL(3f) and ANY(3f)&#39;</span><span class="w"></span>

<span class="c">! M_CLI2 intentionally does not have complex validators except for SPECIFIED(3f) and</span>
<span class="c">! a check whether the input conforms to the type with get_args(3f)</span>
<span class="c">! or the convenience functions like inum(3f). </span>
<span class="c">!</span>
<span class="c">! Fortran already has powerful validation capabilities.  Logical</span>
<span class="c">! expressions ANY(3f) and ALL(3f) are standard Fortran features easily</span>
<span class="c">! allow performing the common validations for command line arguments</span>
<span class="c">! without having to learn any additional syntax or methods.</span>

<span class="k">do </span><span class="n">i</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span><span class="mi">100</span><span class="w"></span>
<span class="w">   </span><span class="k">if</span><span class="p">(</span><span class="k">all</span><span class="p">([</span><span class="n">i</span><span class="w"> </span><span class="o">&gt;=</span><span class="w"> </span><span class="mi">10</span><span class="p">,</span><span class="n">i</span><span class="w"> </span><span class="o">&lt;=</span><span class="w"> </span><span class="mi">30</span><span class="p">,(</span><span class="n">i</span><span class="o">/</span><span class="mi">2</span><span class="p">)</span><span class="o">*</span><span class="mi">2</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">i</span><span class="p">]))</span><span class="k">then</span>
<span class="k">      write</span><span class="p">(</span><span class="o">*</span><span class="p">,</span><span class="o">*</span><span class="p">)</span><span class="n">i</span><span class="p">,</span><span class="s1">&#39; is an even number from 10 to 30 inclusive&#39;</span><span class="w"></span>
<span class="w">   </span><span class="k">endif</span>
<span class="k">enddo</span>

<span class="n">name</span><span class="o">=</span><span class="s1">&#39;red&#39;</span><span class="w"></span>
<span class="n">list</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">[</span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">10</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="s1">&#39;red&#39;</span><span class="p">,</span><span class="s1">&#39;white&#39;</span><span class="p">,</span><span class="s1">&#39;blue&#39;</span><span class="p">]</span><span class="w"></span>
<span class="k">if</span><span class="p">(</span><span class="w"> </span><span class="nb">any</span><span class="p">(</span><span class="n">name</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">list</span><span class="p">)</span><span class="w"> </span><span class="p">)</span><span class="k">then</span>
<span class="k">   write</span><span class="p">(</span><span class="o">*</span><span class="p">,</span><span class="o">*</span><span class="p">)</span><span class="n">name</span><span class="p">,</span><span class="s1">&#39; matches a value in the list&#39;</span><span class="w"></span>
<span class="k">else</span>
<span class="k">   write</span><span class="p">(</span><span class="o">*</span><span class="p">,</span><span class="o">*</span><span class="p">)</span><span class="n">name</span><span class="p">,</span><span class="s1">&#39; not in the list&#39;</span><span class="w"></span>
<span class="k">endif</span>

<span class="k">if</span><span class="p">(</span><span class="n">size</span><span class="p">(</span><span class="n">list</span><span class="p">).</span><span class="n">eq</span><span class="p">.</span><span class="mi">3</span><span class="p">)</span><span class="k">then</span>
<span class="k">   write</span><span class="p">(</span><span class="o">*</span><span class="p">,</span><span class="o">*</span><span class="p">)</span><span class="s1">&#39; list has expected number of values&#39;</span><span class="w"></span>
<span class="k">else</span>
<span class="k">   write</span><span class="p">(</span><span class="o">*</span><span class="p">,</span><span class="o">*</span><span class="p">)</span><span class="s1">&#39; list does not have expected number of values&#39;</span><span class="w"></span>
<span class="k">endif</span><span class="w"></span>

<span class="c">! and even user-defined types can be processed by reading the input</span>
<span class="c">! as a string and using a NAMELIST(3f) group to convert it. Note that</span>
<span class="c">! if input values are strings that have to be quoted (ie. more than one</span>
<span class="c">! word) or contain characters special to the shell that how you have to</span>
<span class="c">! quote the command line can get complicated.</span>

<span class="n">string</span><span class="o">=</span><span class="s1">&#39;10,20,&quot;green&quot;&#39;</span><span class="w"></span>

<span class="n">readme</span><span class="o">=</span><span class="s1">&#39;&amp;nml_dot dot=&#39;</span><span class="o">//</span><span class="n">string</span><span class="o">//</span><span class="s1">&#39;/&#39;</span><span class="w"></span>

<span class="c">! some compilers might require the input to be on three lines</span>
<span class="c">!readme=[ character(len=80) ::&amp;</span>
<span class="c">!&#39;&amp;nml_dot&#39;, &amp;</span>
<span class="c">!&#39;dot=&#39;//string//&#39; ,&#39;, &amp;</span>
<span class="c">!&#39;/&#39;]</span>

<span class="k">read</span><span class="p">(</span><span class="n">readme</span><span class="p">,</span><span class="n">nml</span><span class="o">=</span><span class="n">nml_dot</span><span class="p">)</span><span class="w"></span>

<span class="k">write</span><span class="p">(</span><span class="o">*</span><span class="p">,</span><span class="o">*</span><span class="p">)</span><span class="n">dot</span><span class="p">%</span><span class="n">x</span><span class="p">,</span><span class="n">dot</span><span class="p">%</span><span class="n">y</span><span class="p">,</span><span class="n">dot</span><span class="p">%</span><span class="n">color</span><span class="w"></span>
<span class="c">! or</span>
<span class="k">write</span><span class="p">(</span><span class="o">*</span><span class="p">,</span><span class="n">nml_dot</span><span class="p">)</span><span class="w"></span>

<span class="c">! Hopefully it is obvious how the options can be read from values gotten</span>
<span class="c">! with SGET(3f) and SGETS(3f) in this case, and with functions like IGET(3f)</span>
<span class="c">! in the first case, so this example just uses simple declarations to highlight</span>
<span class="c">! some useful Fortran expressions that can be useful for validating the input</span>
<span class="c">! or even reading user-defined types or even intrinsics via NAMELIST(7f) groups.</span>

<span class="c">! another alternative would be to validate expressions from strings using M_calculator(3f)</span>
<span class="c">! but I find it easier to validate the values using regular Fortran code than doing it</span>
<span class="c">! via M_CLI2(3f), although if TLI (terminal screen GUIs) or GUIs are supported later by</span>
<span class="c">! M_CLI2(3f) doing validation in the input forms themselves would be more desirable.</span>

<span class="k">end program </span><span class="n">demo11</span><span class="w"></span>
</pre></div>

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