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<?xml version="1.0" encoding="ISO-8859-1"?>
<!--
* Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
* Copyright (C) XXXX-2008 - INRIA
*
* This file must be used under the terms of the CeCILL.
* This source file is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at
* http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
*
-->
<refentry version="5.0-subset Scilab" xml:id="execstr" xml:lang="en"
xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:svg="http://www.w3.org/2000/svg"
xmlns:ns4="http://www.w3.org/1999/xhtml"
xmlns:mml="http://www.w3.org/1998/Math/MathML"
xmlns:db="http://docbook.org/ns/docbook">
<info>
<pubdate>$LastChangedDate$</pubdate>
</info>
<refnamediv>
<refname>execstr</refname>
<refpurpose>executa cdigo Scilab em strings</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Seqncia de Chamamento</title>
<synopsis>execstr(instr)
ierr=execstr(instr,'errcatch' [,msg])</synopsis>
</refsynopsisdiv>
<refsection>
<title>Parmetros</title>
<variablelist>
<varlistentry>
<term>instr</term>
<listitem>
<para>vetor de strings, instruo Scilab a ser executada. </para>
</listitem>
</varlistentry>
<varlistentry>
<term>ierr</term>
<listitem>
<para>inteiro, 0 ou nmero de erro. </para>
</listitem>
</varlistentry>
<varlistentry>
<term>msg</term>
<listitem>
<para>string com valores <literal>'m'</literal> ou
<literal>'n'</literal>. O padro <literal>'n'</literal>.</para>
</listitem>
</varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Descrio</title>
<para>Executa as instrues Scilab fornecidas pelo argumento
<literal>instr</literal>.</para>
<para>Note que instr no deve fazer uso de marcas de continuao(..)
</para>
<para></para>
<para>Se o flag 'errcatch' no estiver presente, a manipulao de erros
ocorre de maneira usual.</para>
<para>Se o flag 'errcatch' for ajustado, e um erro for encontrado enquanto
so executadas as instrues definidas em <literal>instr</literal>,
<literal>execstr</literal> no imprime uma mensagem de erro, mas aborta a
execuo das instrues <literal>instr</literal> (no ponto onde o erro
ocorreu) e retorna com <literal>ierr</literal> igual ao nmero de erro.
Neste caso a exibio da mensagem de erro controlada pela opo
<literal>msg</literal> :</para>
<variablelist>
<varlistentry>
<term>"m"</term>
<listitem>
<para>a mensagem exibida e registrada.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>"n"</term>
<listitem>
<para>nenhuma mensagem de erro exibida, mas a mensagem de erro
registrada (ver <literal>lasterror</literal>). Este o
padro.</para>
</listitem>
</varlistentry>
</variablelist>
<para>ierr= execstr(instr,'errcatch') pode manipular erros sintticos.
Isto til para a avaliao de uma instruo obtida por uma pegunta ao
usurio.</para>
</refsection>
<refsection>
<title>Exemplos</title>
<programlisting role="example"><![CDATA[
execstr('a=1') // ajusta a=1.
execstr('1+1') // faz nada (enquanto evstr('1+1') retorna 2)
execstr(['if %t then';
' a=1';
' b=a+1';
'else'
' b=0'
'end'])
execstr('a=zzzzzzz','errcatch')
execstr('a=zzzzzzz','errcatch','m')
//erros de sintaxe
execstr('a=1?02','errcatch')
lasterror(%t)
execstr('a=[1 2 3)','errcatch')
lasterror(%t)
]]></programlisting>
</refsection>
<refsection>
<title>Ver Tambm</title>
<simplelist type="inline">
<member><link linkend="evstr">evstr</link></member>
<member><link linkend="lasterror">lasterror</link></member>
<member><link linkend="error">error</link></member>
<member><link linkend="try">try</link></member>
</simplelist>
</refsection>
</refentry>
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