SPARQL parser has a problem with comments

[Conrad Leonard]

There is an odd issue with the parsing of SPARQL containing comment characters when there are spaces before the characters in certain positions:

using Stardog 3.0 create an empty test database and 3 test queries differeing only in where/whether there are preceding spaces in the comment lines:

[conradL@qimr13054 ~]$ stardog-admin db create -n test

Loading complete.

Inserted 0 triples in 00:00:00.782 at 0.0K triples/sec

Successfully created database 'test'.

[conradL@qimr13054 ~]$ for n in `seq 1 3`; do queryfile="test$n.sparql"; echo ==$queryfile==; cat $queryfile; stardog query test $queryfile; done

==test1.sparql==

#

#

#

SELECT * 

WHERE {

  ?s ?p ?o

}

+-------+-------+-------+

|   s   |   p   |   o   |

+-------+-------+-------+

+-------+-------+-------+

Query returned 0 results in 00:00:00.030

==test2.sparql==

 #

 #

#

SELECT * 

WHERE {

  ?s ?p ?o

}

+-------+-------+-------+

|   s   |   p   |   o   |

+-------+-------+-------+

+-------+-------+-------+

Query returned 0 results in 00:00:00.029

==test3.sparql==

#

 #

 #

SELECT * 

WHERE {

  ?s ?p ?o

}

Not a valid query string or a file: Encountered " "select" "SELECT "" at line 4, column 1.

Was expecting one of:

    <EOF> 

    ";" ...

    "base" ...

    "prefix" ...

    "load" ...

    "clear" ...

    "drop" ...

    "add" ...

    "move" ...

    "copy" ...

    "create" ...

    "insert" ...

    "delete" ...

    "with" ...

    

=Result= 

Error for the query where there is a space before the 2nd and 3rd comment lines

Same when entered into the web console query widget.

[Michael Grove]

Are you sure there's not some non-printable character in that file?  Your third example works fine for me:

mhgrove:dist mhgrove$ echo " #

>  #
> #
> SELECT *
> WHERE {
>   ?s ?p ?o

> }" > input.sparql
mhgrove:dist mhgrove$ ./bin/stardog query foo input.sparql

+-------+-------+-------+
|   s   |   p   |   o   |
+-------+-------+-------+
+-------+-------+-------+

Query returned 0 results in 00:00:00.102

Cheers,

Mike

 

=Result= 

Error for the query where there is a space before the 2nd and 3rd comment lines

Same when entered into the web console query widget.

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[Conrad Leonard]

Hi Mike:

Yr working example is actually test2 (which works for me) - it's the 3rd one that's dodgy, with the leading spaces on 2nd and 3rd lines. I'm sure there are no bad chars involved, I can reproduce this in various ways.

[Michael Grove]

On Tue, Apr 14, 2015 at 9:24 AM, Conrad Leonard <conrad....@hotmail.com> wrote:

Hi Mike:

Yr working example is actually test2 (which works for me) - it's the 3rd one that's dodgy, with the leading spaces on 2nd and 3rd lines. I'm sure there are no bad chars involved, I can reproduce this in various ways.

Yep, you're right.  Looks like a bug in the utility we have to sniff the query type when it comes into the server. 

Thanks for reporting this, it'll be fixed in the next release.

Cheers,

Mike