v1.30

v1.30 (29th October 2021):

• Thanks to a 5km limit covid lockdown in my country, a public holiday where we were
  supposed to be away meant I was stuck at home instead. I took the full day to finish
  the https://github.com/ned14/pcpp/tree/yacc_expression_evaluator branch which is a
  proper C preprocessor expression evaluator based on http://www.dabeaz.com/ply/ 's
  yacc module. This was a very long outstanding piece of work which had been in
  progress for nearly two years. It just needed a full day of my time to get it done,
  and now it is indeed done at long last.
• BREAKING CHANGE: Thanks to the new expression evaluator, fix a long standing bug
  where unknown function macros in expressions were parsed as 0(0) which obviously
  enough does not work. Fixing this changes how the on_unknown_macro_in_expr()
  hook works, and there is now an added on_unknown_macro_function_in_expr() hook.
• Add a new passthru option --passthru-includes which enables selected #include
  to be passed through, in addition to being executed. Thanks to schra for suggesting
  this, including a PR. The original implementation had some subtle corner case bugs,
  thanks to trelau for reporting those.
• Fix a token expansion ordering bug whereby if a function macro used the same
  macro in more than one argument, expansion in one argument evaluation caused overly
  eager expansion in later argument evaluations. This fix ought to fix pcpp's ability
  to parse Boost (untested). Thanks to joaquintides for reporting this.
• Now that pcpp no longer ever calls eval(), pcpp is PyPy compatible and is
  probably also compatible with Pyston (untested). Typical speedup is about 2.2x-2.3x,
  though it can also be slower occasionally for some inputs. PyPy compatibility is now
  being tested by CI to ensure it remains working going forth.
• Fix internal preprocessor error and failure to insert newlines before #include
  caused by certain sequence of line continuations in a macro. Thanks to dslijepcevic
  for reporting this.