[QScintilla] setAutoIndentStyle doesn't work

[Matic Kukovec]

> > On 14 May 2017, at 11:24 pm, Matic Kukovec <kukovecmatic at hotmail.com> wrote:
> > >
> > >
> > > > On 14 May 2017, at 11:26 am, kristof.mulier at telenet.be wrote:
> > > > >
> > > > > Dear QScintilla users,
> > > > >
> > > > > Automatic indentation is a very nice feature offered by QScintilla. When inserting a new line, automatic indentation pushes the cursor to the same indentation level as the previous one. You have two options to switch on this feature: (1) call the function setAutoIndent(True) on the QsciScintilla editor or (2) call the function setAutoIndentStyle(..) on the lexer.
> > > > >
> > > > > The first option works. The second doesn't. For full details on the problem, please take a look at the following StackOverflow question:
> > > > >
> > > > > http://stackoverflow.com/questions/43962669/setautoindentstyle-on-the-qscintilla-lexer-doesnt-work
> > > > >
> > > > > Do you know the answer?
> > > >
> > > > You have to implement the various block method (blockStart(), blockEnd() etc).
> > > >
> > > > Phil
> > >
> > > Hey Phil,
> > >
> > > Tried implementing blockStart() and blockEnd(), but it throws a TypeError if using for example:
> > > def blockStart(self):
> > >         return "{"
> > >
> > > def blockEnd(self):
> > >         return "}"
> > > With a bit of trial&error I found that the methods need to return a tuple of (bytes, int). Why?
> >
> > http://pyqt.sourceforge.net/Docs/QScintilla2/classQsciLexer.html#a7c99eb2877dc6a9762815bc0471f0c36
> >
> > Phil
>
> Hey Phil,
>
> I'm assuming it means that it returns a tuple(bytesstring_of_block_start_chars, pointer_to_style), because lexers that implement the blockStart method (like QsciLexerPython) return (None, some_large_number). But why do they always return the byte_string as None?
>
> Anyway, I edited the blockStart() and blockEnd() methods of my custom lexer to:
>
>     def blockStart(self):
>         return b'{', 0
>
>     def blockStart(self):
>         return b'}', 0
>
> and set the qscintilla editors setAutoIndent(True) and my custom lexers setAutoIndentStyle(QsciScintilla.AiOpening | QsciScintilla.AiOpening). Now the next line after inserting a '{' doesn't indent (like in the QsciLexerCPP, for example), but it does unindent when inserting a '}'?
> Example:
>
>     if (test)
>     {
>     |<- doesn't indent
>
> Then I manually indent:
>
>     if (test)
>     {
>         |<- manual indent with the tab key
>          test line added;
>
> Inserting the '}' character unindents automatically:
>
>     if (test)
>     {
>
>          test line added;
>     } <- automatically unindented from the previous line's indentation level
>
> I really have no idea if I'm doing something wrong or if I'm misunderstanding something, could you please help?
>
> P.S.:
> I'm also helping Kristof, so that is why we are both posting separately on the same topic.
>
> Matic

Hey Phil,

I realize that I have no idea how this autoIndentStyle works. Could  you explain step-by-step what and how things need to be implemented for this functionality to work correctly?

Thanks,
Matic
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