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style: avoid explicit symbol numbers

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This should have been part of commit "symbols: stop dealing with YYEMPTY
as b4_symbol(-2, ...)" (cd40ec9526).
Give names to all the special symbols: "eof", "error" and "undef".

* data/skeletons/bison.m4 (b4_symbol): Let `b4_symbol(eof, ...)` mean
`b4_symbol(0, ...)`, `b4_symbol(error, ...)` mean `b4_symbol(1, ...)`,
and , `b4_symbol(undef, ...)` mean `b4_symbol(2, ...)`..

* data/skeletons/c.m4, data/skeletons/glr.c, data/skeletons/glr.cc,
* data/skeletons/glr2.cc, data/skeletons/lalr1.cc,
* data/skeletons/lalr1.d, data/skeletons/lalr1.java,
* data/skeletons/yacc.c:
Prefer symbols to numbers.
This commit is contained in:
Akim Demaille
2020-11-07 16:21:00 +01:00
parent 34e6e8815a
commit 5a31cda4c3
10 changed files with 82 additions and 75 deletions
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12
data/skeletons/glr.cc
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@@ -241,10 +241,10 @@ m4_define([b4_glr_cc_setup],
#undef ]b4_symbol(empty, [id])[
#define ]b4_symbol(empty, [id])[ ]b4_namespace_ref[::]b4_parser_class[::token::]b4_symbol(empty, [id])[
#undef ]b4_symbol(0, [id])[
#define ]b4_symbol(0, [id])[ ]b4_namespace_ref[::]b4_parser_class[::token::]b4_symbol(0, [id])[
#undef ]b4_symbol(1, [id])[
#define ]b4_symbol(1, [id])[ ]b4_namespace_ref[::]b4_parser_class[::token::]b4_symbol(1, [id])[
#undef ]b4_symbol(eof, [id])[
#define ]b4_symbol(eof, [id])[ ]b4_namespace_ref[::]b4_parser_class[::token::]b4_symbol(eof, [id])[
#undef ]b4_symbol(error, [id])[
#define ]b4_symbol(error, [id])[ ]b4_namespace_ref[::]b4_parser_class[::token::]b4_symbol(error, [id])[
#ifndef ]b4_api_PREFIX[STYPE
# define ]b4_api_PREFIX[STYPE ]b4_namespace_ref[::]b4_parser_class[::semantic_type
@@ -271,8 +271,8 @@ m4_define([b4_undef_symbol_kind],
# Remove redirections for glr.c.
m4_define([b4_glr_cc_cleanup],
[[#undef ]b4_symbol(empty, [id])[
#undef ]b4_symbol(0, [id])[
#undef ]b4_symbol(1, [id])[
#undef ]b4_symbol(eof, [id])[
#undef ]b4_symbol(error, [id])[
]b4_undef_symbol_kind(-2)dnl
b4_symbol_foreach([b4_undef_symbol_kind])dnl