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Conf: Allow keywords to be redefined by user symbols

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Most syntactic constructs in BIRD configuration (e.g. protocol options)
are defined as keywords, which are distinct from symbols (user-defined
names for protocols, variables, ...). That may cause backwards
compatibility issue when a new feature is added, as it may collide with
existing user names.

We can allow keywords to be shadowed by symbols in almost all cases to
avoid this issue.

This replaces the previous mechanism, where shadowable symbols have to be
explictly added to kw_syms.
This commit is contained in:
Ondrej Zajicek
2022-12-13 19:31:46 +01:00
parent cce48c6cdd
commit f5140d1027
9 changed files with 20 additions and 14 deletions
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nest/config.Y
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@@ -154,8 +154,6 @@ CF_ENUM_PX(T_ENUM_AF, AF_, AFI_, IPV4, IPV6)
CF_GRAMMAR
kw_sym: MIN | MAX ;
/* Setting of router ID */
conf: rtrid ;
@@ -842,7 +840,7 @@ sym_args:
| sym_args FILTER { $$ = $1; $$->type = SYM_FILTER; }
| sym_args PROTOCOL { $$ = $1; $$->type = SYM_PROTO; }
| sym_args TEMPLATE { $$ = $1; $$->type = SYM_TEMPLATE; }
| sym_args symbol { $$ = $1; $$->sym = $2; }
| sym_args CF_SYM_KNOWN { $$ = $1; $$->sym = $2; }
;