D23691: C & ISO C++: add digraphs (folding & preprocessor)

[Nibaldo González]

nibags created this revision.
nibags added reviewers: Framework: Syntax Highlighting, dhaumann, cullmann.
Herald added projects: Kate, Frameworks.
Herald added subscribers: kde-frameworks-devel, kwrite-devel.
nibags requested review of this revision.

REVISION SUMMARY
  BUG: 411508
  
    1. ISO C ++
  - Add folding for digraphs `<%`, `%>`, `<:` and `:>`, which are equivalent to `{`, `}`, `[` and `]`.
  - Fix the highlight of `%:` in preprocessor, for example, `%:include <some>`.
  
    1. C
  - Add folding for digraphs `<%` and `%>`, which are equivalent to `{` and `}`.
  - Add `%:` equivalent to `#` in preprocessor.
  
  Trigraphs were removed in C++17 and are supported in C (if activated in the compiler), but are almost obsolete. That's why I decided not to add them. Although if you wish I can add folding to `??<` and `??>`, which are equivalent to `{` and `}`.
  
  **More:**
  
  - https://en.wikipedia.org/wiki/Digraphs_and_trigraphs#C

REPOSITORY
  R216 Syntax Highlighting

BRANCH
  cpp-digraphs

REVISION DETAIL
  https://phabricator.kde.org/D23691

AFFECTED FILES
  autotests/folding/highlight.cpp.fold
  autotests/folding/test.c.fold
  autotests/html/highlight.cpp.html
  autotests/html/test.c.html
  autotests/input/highlight.cpp
  autotests/input/test.c
  autotests/reference/highlight.cpp.ref
  autotests/reference/test.c.ref
  data/syntax/c.xml
  data/syntax/isocpp.xml

To: nibags, #framework_syntax_highlighting, dhaumann, cullmann
Cc: kwrite-devel, kde-frameworks-devel, LeGast00n, GB_2, domson, michaelh, ngraham, bruns, demsking, cullmann, sars, dhaumann
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