Re: Re: Ranking of OO refactorings

On Sun, Jul 14, 2013 at 11:16 AM, Richard <[email protected]> wrote:

> **
>
>
> > Unfortunately, C++ is a very complex language syntactically and
> > semantically. That has really made it hard for the vendors to automate
> the
> > refactorings.
>
> One of the problems facing the C and C++ parsers in refactoring tools (and
in pretty printers too) is the preprocessor. In short, you can, within
limits, change the grammar of C++ using the preprocessor. For example:

  #define while   for
  #define forever (;;)
  #define always printf
  #define swirly2(s) #s " "
  #define swirly1 swirly2(goodbye) swirly2(cruel) swirly2(world)
  #define swirl printf(swirly1)

  ....
  while forever swirl;
  ....

The "while forever swirl" is not valid C/C++ but the generated output from
the preprocessor, *is* valid C/C++. As far as I know, it is not possible to
define a grammar of the combined preprocessor and compiler.

Second, there are many, many compilers that introduce slight variants of
the standard grammar: new keywords, slight changes to where some things are
allowed, etc.

John


[Non-text portions of this message have been removed]



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