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<a name="Conditional-directives-1"></a>
<h2 class="appendixsec"> B.4 Conditional directives </h2>
<p>Conditional directives may be used to conditionnaly skip blocks of
code. There are 4 conditional directives: <code>if</code>, <code>elseif</code>,
<code>else</code> and <code>endif</code>. <code>+if</code> begins a conditional directives
sequence, with argument a conditional expression. If the expression is
true the block of code following the <code>+if</code> is output in the
resulting file, up to another conditional directive, if it is false
the code block is skipped. If the
expression is false and the following conditional directive is
<code>+elseif</code>, the same procedure is followed with the argument of
<code>+elseif</code>
which is also a conditionnal expression. More than one <code>+elseif</code>
may follow a <code>+if</code>. If a <code>+if</code> or <code>+elseif</code> expression
is true the following
code block is output and all
the following <code>+elseif</code> code blocks are skipped. If all the <code>+if</code>
and <code>+elseif</code> expressions are false and
the following coditionnal
directive is <code>+else</code> then the block following the
<code>+else</code> is output. If a previous expression was true the
code block following the <code>+else</code> is skipped. The last code block
is closed by <code>+endif</code>.
</p>
<p>Conditionnal directives may be nested, a <code>+if</code> begins a deeper
conditionnal sequences directives that is ended by the corresponding
<code>+endif</code>.
</p>
<p>The simplest example is:
</p>
<pre class="verbatim"> some code;
+IF,monitor
code output only if monitor is true;
+ENDIF
</pre>
<p>If ‘<samp>monitor</samp>’ is selected, the <code>+if</code> block is output, it leads to
</p>
<pre class="verbatim"> some code;
code output only if monitor is true;
</pre>
<p>If ‘<samp>monitor</samp>’ isn’t selected the <code>+if</code> block is skipped, it leads to
</p>
<pre class="verbatim"> some code;
</pre>
<p>An example with <code>+else</code> may be:
</p>
<pre class="verbatim">+IF,double
call dmysub(eta);
+ELSE
call smysub(eta);
+ENDIF
</pre>
<p>If ‘<samp>double</samp>’ is selected the code output is <code>call dmysub(eta);</code>,
if ‘<samp>double</samp>’ isn’t selected the code output is <code>call dmysub(eta);</code>.
</p>
<p>Here is a self explanatory example of use of <code>+elseif</code>:
</p>
<pre class="verbatim">+IF,monitor
code used if monitor is selected;
+ELSEIF,kalman
code used if kalman is selected and monitor is not;
+ELSE
code used if kalman and monitor are not selected;
+ENDIF
</pre>
<p>And last an example of nested conditional directives:
</p>
<pre class="verbatim">+IF,monitor
code used if monitor is selected;
+_IF,kalman. deep if
code used if monitor and kalman are selected;
+_ELSE. deep else
code used if monitor is selected and kalman is not;
+_ENDIF. end the deep conditionnals sequence
+ELSE
code used if monitor is not selected;
+_IF,kalman
code used if monitor is not selected but kalman is;
+_ELSE
code used if monitor and kalman are not selected;
+_ENDIF
other code used if monitor is not selected;
+ENDIF
</pre>
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