OpenEuphoria

2. Re: Variable substitution

• Posted by Mike <vulcan at w?n.co?nz> Dec 12, 2007
• 698 views
• Last edited Dec 13, 2007

Mike777 wrote:
> 
> I have read a few threads on variable substitution, but they all seem to
> predate
> v3.1.1.  Has the ability been added?  If not, is there a common way to
> implement
> it? 
> 
> I'm trying to develop of database driven windowing system.  That means I read
> from my database the information I need in order to build windows and widgets.
> 
> A simple example might be that I go to the database to find that I want to
> build
> a combo box and that the name of the combo box should be "Combo1".
> 
> If I was positioning the combo myself in the IDE, it might generate the
> following:
> 
> global constant Combo1 = createEx( Combo, "", Window1, 432, 76, 588, 28*6,
> PBS_VERTICAL+LBS_NOINTEGRALHEIGHT,
> 0 )
> 
> After I read the database, I have two variables, say TYPEOFWIDGETTOBUILD,
> which
> has the value "Combo" and NUMBEROFWIDGETTOBUILD, which has the value "1"
> 
> Is there any way to write something like:
> 
> global constant &TYPEOFCOMOBOTOBUILD&NAMEOFWIDGETTOBUILD = createEx( Combo,
> "", Window1, 432, 76, 588, 28*6, PBS_VERTICAL+LBS_NOINTEGRALHEIGHT, 0 )
> 
> If that can't be done, can somebody suggest a workaround?
> 
> Thanks
> 
> Mike


What you seem to be trying to do will entail building a file that contains the
correct text.
You need to output a text string having the desired values. Eg,

sequence text

text = "global constant " & TYPEOFCOMOBOTOBUILD&NUMBEROFWIDGETTOBUILD

This (as you know) evaluates to "global constant Combo1"

You can use a function like sprintf() to format certain values (such as control
dimensions etc..), eg:

constant
  height = 100,
  width = 200

text = sprintf( "Window, %d, %d" {width, height})

..becomes "Window, 200, 100"

Another example:

text = sprintf( 
  "global constant %s%s = create( %s, \"\", Window1, %d, %d)",
{TYPEOFCOMOBOTOBUILD, NUMBEROFWIDGETTOBUILD, TYPEOFCOMOBOTOBUILD, width,
  height} )

text is now "global constant Combo1 = create( Combo, "", Window1, 200, 100)"

And then there is printf() which is the same as sprintf() but also outputs the
string to a file.
If you create the text string separately you can use puts() to output it to a
file, eg:

puts(file_id, text)

Dont forget the line terminator, eg:

puts(file_id, text & '\n')

HTH,
Mike

4. Re: Variable substitution

• Posted by Mike777 <anon4321 at gmail.?o?> Dec 12, 2007
• 635 views
• Last edited Dec 13, 2007

c.k.lester wrote:
> 
> Mike777 wrote:
> > 
> > Is there any way to write something like:
> > 
> > global constant &TYPEOFCOMOBOTOBUILD&NAMEOFWIDGETTOBUILD = createEx( Combo,
> > "", Window1, 432, 76, 588, 28*6, PBS_VERTICAL+LBS_NOINTEGRALHEIGHT, 0 )

> Be sure to investigate Derek's awesome alternate method of creating
> controls ("newUIObj"). 
>....
> The newUIObj functionality is very versatile. You could read whole
> interface systems from a text file (or database!)... but there's a lot more
> to it.
> 
> **********************************************
> ****************OMG!!!!!!!!!!*****************
> **********************************************
> 
> Actually, now that I've typed all this up... Looks like the newUIObj
> feature already has provision for calling named controls... So, either use
> what I said above with the "old way," or go with the new and improved way.
> 
> Derek, you really should trumpet newUIObj+startApp. :)
> 
> I wonder how easy it would be to make the IDE output newUIObjs instead of
> create()s... :)

It appears that newUUIObj is exactly what I'm looking for.

Back to the testing bench......

Thanks

Mike

6. Re: Variable substitution

• Posted by Mike <vulcan at w?n.co.n?> Dec 13, 2007
• 652 views

Mike777 wrote:
> 
> Mike wrote:
>  
> > Mike777 wrote:
> > > 
> > > I have read a few threads on variable substitution, but they all seem to
> > > predate
> > > v3.1.1.  Has the ability been added?  If not, is there a common way to
> > > implement
> > > it? 
> 
> > What you seem to be trying to do will entail building a file that contains
> > the
> > correct text.
> 
> Thanks for the code, it will be helpful.  However, I don't think it will allow
> me a one-pass solution, will it?  Assuming I write the file with a bunch of
> those lines, how do I then execute those lines within the same program that
> wrote them?
> 
> If the goal is to build a separate exw file which can then be run, what you
> suggest would work a treat, though.
> 
> Otherwise, I think I'm heading down the newUIOBJ path.
> 
> Mike

To run an external file you would use system() or system_exec(). I use the
latter in Orac
to execute the built file. Of course, you would have 2 separate programs
executing rather
than dynamically changing the one running program. Still, this would be easier
than newUIOBJ
but it all depends what you are trying to achieve.

Mike