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Do not allow identifiers that start with a negative number.

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Reported by Paul Hilfinger as a side effect of named references
support at
<http://lists.gnu.org/archive/html/bug-bison/2011-01/msg00000.html>.
Suggested by Paul Eggert.
* src/scan-code.l ({letter}, {id}): Adjust lexical definitions.
* src/scan-gram.l ({letter}, {id}): Likewise.
This commit is contained in:
Alex Rozenman
2011-01-05 15:47:25 +02:00
parent 9a4292e580
commit d236ad946b
3 changed files with 14 additions and 4 deletions
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4
src/scan-code.l
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@@ -84,8 +84,8 @@ splice (\\[ \f\t\v]*\n)*
/* C style identifier. Must start with letter. Will be used for
named symbol references. Shall be kept synchronized with
scan-gram.l "letter" and "id". */
letter [-.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_]
id {letter}({letter}|[0-9])*
letter [.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_]
id -*(-|{letter}({letter}|[-0-9])*)
ref -?[0-9]+|{id}|"["{id}"]"|"$"
%%