[Rosegarden-devel] Qt4 mechanization tools

[Yves G. <yc....@wa...>]

I have just added to convert.pl some tools to help the mechanization.
They make possible some complex replacements without having to use too much 
perl.

I changed the QVBox/QHBox related code in convert.pl to use these new tools.

You can now do what all my perl code was doing only by writing  something 
like :
{
    my $p = Process->new($code);

    $p->trigger('QHBox * ${hbox} = new QHBox ( ${parent} ) ;');
    $p->replacement('QWidget *${hbox} = new QWidget(${parent});');
    $p->replacement('QHBoxLayout ${hbox}Layout = new QHBoxLayout;');

        $p->target('${widget} * ${child} = new ${widget} ( @{before,} ${hbox} 
@{,after} ) ;', "A");
        $p->replacement('${widget} *${child} = new ${widget}(@{before,} 
${hbox} @{,after});');
        $p->replacement('${hbox}Layout->addWidget(${child});');

        $p->addAfterLast("A", '${hbox}->setLayout(${hbox}Layout);');

    $code = $p->exec();
}
 
Trigger function defines a C++ group of words to replace.
Replacement function defines by what the precedent group shall be replaced
Variable names (${hbox}, ${parent}) contains what is specific to the replaced 
group and can be used in the replacement strings.

Target/Replacement functions works as Trigger/Replacement, but are used only 
if trigger string has been found and can use variable defined in trigger.

addAfterLast function can be used to add some strings after a group of 
replacements (probably not very useful).

More complete explanations on how to use theese tools can be found at the 
beginning of mechanization_tools.pm file.

Looking at the QHBox/QVBox conversion as an exemple may also be useful.

Please, forgive the terminology trigger/target, etc... which is maybe not very 
appropriate.

Hoping these tools can be of some help.


Yves