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Simplify handling of '.' and '-' after unbracketed named references.

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* doc/bison.texinfo (Mid-Rule Actions): Mention that periods and
dashes make symbol names less convenient for named references.
* src/scan-code.l:
(handle_action_dollar): New arg textlen.  All callers changed.
(handle_action_at): Likewise.  Also, args are pointers to const.
(ref_tail_fields): Remove; no longer used.
(letter): Now includes '-' and '.', since this is for Bison
identifiers.
(id): Now the simpler traditional defn, since letters now include
'-' and '.'.
(c_letter, c_id): New defns.
(ref): Use c_id for unbracketed IDs.
(<SC_RULE_ACTION>): Simplify, now that the distinction between
Bison and unbracketed IDs are now in the regular expressions.
(VARIANT_BAD_BRACKETING): Remove.
(VARIANT_NOT_VISIBLE_FROM_MIDRULE): Renumber.
(find_prefix_end): Remove, replacing with ....
(identifier_matches): New function.
(variant_add): Use it.  Omit EXPLICIT_BRACKETING arg; no longer
needed.  CP arg is pointer to constant.  All callers changed.
(show_sub_messages): Remove args CP, EXPLICIT_BRACKETING, DOLLAR_OR_AT.
New arg TEXT.  All callers changed.  Do not worry about showing
trailing context.
(parse_ref): Args CP, RULE, TEXT are now pointers to const.  New
arg TEXTLEN.  Remove arg DOLLAR_OR_AT.  All callers changed.
Simplify code now that the regular expressions capture the
restrictions.
* src/scan-gram.l (letter, id): Adjust to match scan-code.l.
* src/symlist.c (symbol_list_null): Arg is now pointer to const.
* src/symlist.h: Likewise.
* tests/named-refs.at (Misleading references): These are now caught
by the C compiler, not by Bison; that's good enough.  Adjust test
to reflect this.
(Many kinds of errors, Unresolved references): Adjust expected
diagnostics to match new behavior.  The same errors are caught,
though the diagnostics are not quite as fancy.
($ or @ followed by . or -): Likewise.  Also, Make the grammar
unambiguous, so that diagnostics are not complicated by ambiguity
warnings.
This commit is contained in:
Paul Eggert
2011-01-09 23:26:12 -08:00
parent 3c9b20ff5a
commit bf3e44fe46
7 changed files with 147 additions and 159 deletions
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4
doc/bison.texinfo
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@@ -3125,7 +3125,9 @@ By convention, it should be all lower case.
Symbol names can contain letters, underscores, periods, dashes, and (not
at the beginning) digits. Dashes in symbol names are a GNU
extension, incompatible with POSIX Yacc. Terminal symbols
extension, incompatible with POSIX Yacc. Periods and dashes make symbol
names less convenient to use with named references, which require brackets
around such names (@pxref{Named References}). Terminal symbols
that contain periods or dashes make little sense: since they are not
valid symbols (in most programming languages) they are not exported as
token names.