[Doxygen-develop] [PATCH] Improved ALIASES definitions

[Markus G. <mg...@we...>]

Hi,

please find two patches attached regarding the definition of ALIASES.
The first one simply fixes a typo in an error message. The second
patch implements escaping of commands using the \-syntax in the value
part of ALIASES.

Rationale:
So far, there was no way to disambiguate a forced newline (via '\n')
from a command using the \-syntax starting with 'n'. While special
handling was implemented for some internal commands, self-defined
commands or LaTeX commands inside a \latexonly environment were not
recognized. For example, it was impossible to properly define a
command inserting a newline followed by a page break only for the
LaTeX output, as the '\newpage' in

	newpage="\latexonly\n\newpage\endlatexonly"

was recognized as '\n' followed by the text 'ewpage'.

Proposed solution:
The attached patch implements C-style escaping for the value part of
ALIASES. That is, '\n' inserts a newline, '\"' a quote character,
'\\' a backslash, and '\<num>' expands the corresponding argment.
The aforementioned command can therefore now be defined as either

	newpage="\\latexonly\n\\newpage\\endlatexonly"
or
	newpage"@latexonly\n\\newpage@endlatexonly"

While this solution is admittedly not backwards-compatible, it is
IMO preferable over only escaping '\n's as it provides a consistent
escaping scheme that is easy to remember.

Cheers,
Markus