Firstly, thanks by answer.<br><br>The second way is nice, but could be generic (e.g. save any variable in a namespace)?<br><br>--<br>Wagner Macedo <br>
<br><br><div class="gmail_quote">On 5 January 2012 13:04, Wolfgang Schuster <span dir="ltr">&lt;<a href="mailto:schuster.wolfgang@googlemail.com">schuster.wolfgang@googlemail.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">

<div style="word-wrap:break-word"><br><div><div>Am 05.01.2012 um 15:49 schrieb Wagner Macedo:</div><div><div class="h5"><br><blockquote type="cite">Hello,<br><br>I&#39;m relatively quite new to TeX world. This is my first message to list. I hope you understand me, English isn&#39;t my mother language.<br>

<br>I&#39;m trying to use a variable set by \setvariable in Lua. I tried some combinations, based on manual but I couldn&#39;t succeed. The code below exemplifies what I wanted to do.<br>

<br style="font-family:courier new,monospace"><span style="font-family:courier new,monospace">\starttext</span><br style="font-family:courier new,monospace"><span style="font-family:courier new,monospace">\setvariable{namespace}{var}{Some context}</span><br style="font-family:courier new,monospace">



<span style="font-family:courier new,monospace">\ctxlua{<br style="font-family:courier new,monospace"></span><span style="font-family:courier new,monospace">  local s = context.getvariable(&quot;namespace&quot;, &quot;var&quot;)<br>



<br style="font-family:courier new,monospace"></span><span style="font-family:courier new,monospace">  if s == &quot;&quot; then<br>    ...<br>  else<br>    ...<br>  end<br style="font-family:courier new,monospace"></span><span style="font-family:courier new,monospace">}</span><br style="font-family:courier new,monospace">



<span style="font-family:courier new,monospace">\stoptext</span><br><br>I know that I can use some of \if* TeX commands, but coding in Lua is better to me.<br></blockquote></div></div></div><div><br></div><div>What you’re trying is not possible but there are other ways to check the content of the variable in Lua.</div>

<br><div><div>\startluacode</div><div><br></div><div>userdata = userdata or { }</div><div><br></div><div>function userdata.checkvariable(variable)</div><div><span style="white-space:pre-wrap">	</span>if variable == &quot;&quot; then</div>

<div><span style="white-space:pre-wrap">		</span>context(&quot;EMPTY&quot;)</div><div><span style="white-space:pre-wrap">	</span>else</div><div><span style="white-space:pre-wrap">		</span>context(&quot;NOT EMPTY&quot;)</div>

<div><span style="white-space:pre-wrap">	</span>end</div><div>end</div><div><br></div><div>\stopluacode</div><div><br></div><div>\setvariable{wagner}{name}{Wagner Macedo}</div><div><br></div><div>\starttext</div><div><br>

</div><div>\ctxlua{userdata.checkvariable(&quot;\getvariable{wagner}{name}&quot;)}</div><div><br></div><div>% This does only with \startlua or \ctxlua</div><div><br></div><div>\startlua</div><div><br></div><div>local name = &quot;\getvariable{wagner}{name}&quot;</div>

<div><br></div><div>if name == &quot;&quot; then</div><div><span style="white-space:pre-wrap">	</span>context(&quot;No Text&quot;)</div><div>else</div><div><span style="white-space:pre-wrap">	</span>name = &quot;Name: &quot; .. name</div>

<div><span style="white-space:pre-wrap">	</span>context(name)</div><div>end</div><div><br></div><div>\stoplua</div><div><br></div><div>\stoptext</div></div><div><br></div><div>A different method is to save the \setvariables entries in a Lua table and check the entries of the table.</div>

<div><br></div><div><div>\startluacode</div><div><br></div><div>userdata        = userdata        or { }</div><div>userdata.macedo = userdata.macedo or { }</div><div><br></div><div>userdata.macedo.data = { }</div><div><br>

</div><div>function userdata.macedo.savevariables(variables)</div><div><span style="white-space:pre-wrap">	</span>userdata.macedo.data = variables</div><div>end</div><div><br></div><div>function userdata.macedo.checkvariables()</div>

<div><span style="white-space:pre-wrap">	</span>local variables = userdata.macedo.data</div><div><span style="white-space:pre-wrap">	</span>-- check for name </div><div><span style="white-space:pre-wrap">	</span>if <a href="http://variables.name" target="_blank">variables.name</a> == &quot;&quot; then</div>

<div><span style="white-space:pre-wrap">		</span>context(&quot;Name: No name set&quot;)</div><div><span style="white-space:pre-wrap">		</span>context.par()</div><div><span style="white-space:pre-wrap">	</span>else</div><div>

<span style="white-space:pre-wrap">		</span>context(&quot;Name: &quot;..<a href="http://variables.name" target="_blank">variables.name</a>)</div><div><span style="white-space:pre-wrap">		</span>context.par()</div><div><span style="white-space:pre-wrap">	</span>end</div>

<div><span style="white-space:pre-wrap">	</span>-- check for address</div><div><span style="white-space:pre-wrap">	</span>if variables.address == &quot;&quot; then</div><div><span style="white-space:pre-wrap">		</span>context(&quot;Address: No address set&quot;)</div>

<div><span style="white-space:pre-wrap">		</span>context.par()</div><div><span style="white-space:pre-wrap">	</span>else</div><div><span style="white-space:pre-wrap">		</span>context(&quot;Address: &quot;..variables.address)</div>

<div><span style="white-space:pre-wrap">		</span>context.par()</div><div><span style="white-space:pre-wrap">	</span>end</div><div>end</div><div><br></div><div>\stopluacode</div><div><br></div><div>\starttexdefinition SaveVariables</div>

<div><span style="white-space:pre-wrap">	</span>\startlua</div><div><span style="white-space:pre-wrap">		</span>userdata.macedo.savevariables{</div><div><span style="white-space:pre-wrap">			</span>name    = &quot;\getvariable{macedo}{name}&quot;,</div>

<div><span style="white-space:pre-wrap">			</span>address = &quot;\getvariable{macedo}{address}&quot;,</div><div><span style="white-space:pre-wrap">		</span>}</div><div><span style="white-space:pre-wrap">	</span>\stoplua</div>

<div>\stoptexdefinition</div><div><br></div><div>\setvariables[macedo][set=\SaveVariables]</div><div><br></div><div>\starttext</div><div><br></div><div>\setvariables[macedo][name=Wagner Macedo]</div><div><br></div><div>\ctxlua{userdata.macedo.checkvariables()}</div>

<div><br></div><div>\setvariables[macedo][address=Secret]</div><div><br></div><div>\ctxlua{userdata.macedo.checkvariables()}</div><div><br></div><div>\stoptext</div></div><span class="HOEnZb"><font color="#888888"><div><br>

</div><div>Wolfgang</div><div><br></div></font></span></div><br>___________________________________________________________________________________<br>
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