еще один компилятор компилятора (РАЗРАБОТКА) (yet another compiler compiler (DEVELOPMENT))
Использование в приложениях (Application usage)
Historical implementations experience name conflicts on the names
yacc.tmp, yacc.acts, yacc.debug, y.tab.c, y.tab.h, and y.output
if more than one copy of yacc is running in a single directory at
one time. The -b option was added to overcome this problem. The
related problem of allowing multiple yacc parsers to be placed in
the same file was addressed by adding a -p option to override the
previously hard-coded yy variable prefix.
The description of the -p option specifies the minimal set of
function and variable names that cause conflict when multiple
parsers are linked together. YYSTYPE does not need to be changed.
Instead, the programmer can use -b to give the header files for
different parsers different names, and then the file with the
yylex() for a given parser can include the header for that
parser. Names such as yyclearerr do not need to be changed
because they are used only in the actions; they do not have
linkage. It is possible that an implementation has other names,
either internal ones for implementing things such as yyclearerr,
or providing non-standard features that it wants to change with
-p.
Unary operators that are the same token as a binary operator in
general need their precedence adjusted. This is handled by the
%prec advisory symbol associated with the particular grammar rule
defining that unary operator. (See Grammar Rules in yacc.)
Applications are not required to use this operator for unary
operators, but the grammars that do not require it are rare.
