The Antlr grammar for Subtree Specification (RFC 3672) does not handle
Separators correctly
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Key: DIRLDAP-52
URL: http://issues.apache.org/jira/browse/DIRLDAP-52
Project: Directory LDAP
Type: Bug
Components: Common
Versions: 0.9.3
Reporter: Ersin Er
The Antlr grammar for Subtree Specification (RFC 3672) handles SP token as ' '
(single space) and MSP as (' ')+. The SEP token is handled as ',' everywhere.
However, "RFC 3642" defines them as follows:
"
3. Separators
Certain separators are commonly used in constructing equivalent ABNF
for SET and SEQUENCE types.
sp = *%x20 ; zero, one or more space characters
msp = 1*%x20 ; one or more space characters
sep = [ "," ]
The <sep> rule is used in the ABNF description of the encoding for
ASN.1 SET or SEQUENCE types where all the components are either
OPTIONAL or DEFAULT. It encodes to an empty string if and only if
the immediately preceding character in the encoding is "{", i.e., it
is only empty for the first optional component actually present in
the SET or SEQUENCE value being encoded.
"
So,
SP token should be handled as Zero Or More Spaces Characters which is (' ')*,
MSP token should be handled as OneOr More Spaces Characters which is (' ')+,
and
SEP should be handled in a way that it should match empty string when it comes
just after a "{" token. (This one is an interesting problem.)
I'm working on this issue now and will submit a patch soon. Comments are
welcome.
The grammar file considered is:
http://svn.apache.org/viewcvs.cgi/directory/shared/ldap/trunk/common/src/antlr/subtree-specification.g?rev=265643&view=markup
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