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variables: accept dashes.

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* data/bison.m4 (b4_percent_define_if_define_): Also map dashes to
	underscores.
	* src/scan-gram.l ({id}): Also accept dashes after the initial
	letter.
	({directive}): Use {id}.
	* src/parse-gram.y: Comment and formatting changes.
	* doc/bison.texinfo (Symbols): Adjust the lexical definitions of
	symbols.
	* src/complain.h, src/complain.c (yacc_at): New.
	* src/symtab.c (symbol_new): Use yacc_at to report inappropriate
	symbol names.
	* src/output.c (token_definitions_output): Do not #define token
	names with dashes.
This commit is contained in:
Akim Demaille
2009-04-20 12:24:23 +02:00
parent 184e317956
commit 4f646c3794
9 changed files with 75 additions and 18 deletions
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8
doc/bison.texinfo
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@@ -3053,8 +3053,12 @@ A @dfn{nonterminal symbol} stands for a class of syntactically
equivalent groupings. The symbol name is used in writing grammar rules.
By convention, it should be all lower case.
Symbol names can contain letters, digits (not at the beginning),
underscores and periods. Periods make sense only in nonterminals.
Symbol names can contain letters, underscores, period, and (not at the
beginning) digits and dashes. Dashes in symbol names are a GNU
extension, incompatible with @acronym{POSIX} Yacc. 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.
There are three ways of writing terminal symbols in the grammar: