Howto modify selection from replace buffer (FindAdv)

[Kornel Benko]

Am Sat, 09 Jan 2021 12:58:16 +0100
schrieb Jürgen Spitzmüller <spitz at lyx.org>:

> Am Freitag, dem 08.01.2021 um 11:39 +0100 schrieb Kornel Benko:
> > I have problems to _use_ matched substrings in replace-mode.
> > 
> > For instance given regular expression containing some groups, like
> > 	'(xxxx)(zzzz)(yyyy)'
> > and I want to change the found value to 'yyyyzzzzxxxx', so in regex I
> > would write
> > 	'\3\2\1'
> > 
> > Now the selection contains '\3\2\1', this is selected (in
> > lyxfind.cpp:findAdvReplace())
> > with
> > 		cap::pasteParagraphList(cur,
> > repl_buffer.paragraphs(),
> >                                        
> > repl_buffer.params().documentClassPtr(),
> >                                         bv-  
> > > buffer().errorList("Paste"));  
> >                 LYXERR(Debug::FIND, "After pasteParagraphList() cur="
> > << cur << endl);
> >                 sel_len = repl_buffer.paragraphs().begin()->size();
> > and then follows
> > 	bv->putSelectionAt(DocIterator(cur), sel_len, !opt.forward);
> >         bv->processUpdateFlags(Update::Force);
> > 
> > How can I modify the data prior to inserting into buffer ?
> > The values of '\1', '\2', '\3' are known here, but are not used.  
> 
> I think you should write a function similar to changeFirstCase() that
> iterates over repl_buffer and replaces the placeholder in all
> paragraphs. Then the cap::pasteParagraphList() function in question
> should insert the modified paragraph(s).
> 
> I don't know how difficult such a function would be, though.
> 
> Jürgen
> 

Yes, I overseen the LASSERT(repl_buffer.readString(lyx), return 0) statement,
so I was confused.

I can handle it now, but there is one difficulty, I cannot resolve.
The search-buffer and the replace-buffer contain not only strings, but also
the font, colour, size, specs.
ATM, the spec is used from the replace-buffer (only the char-cases are handled
differently)
We need a flag to know what should be done.

Committed at 60980b0e.

The replacement strings are '$$0', '$$1', ... , '$$6'
Number 7, 8, 9 are reserved, because the algorithm eats 3 of them.

	Kornel

	Kornel
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