[#SES-640] SPARQL Parser unescapes backslashes twice

Issue Details [XML]

Key:	SES-640
Type:	Bug
Status:	Closed
Resolution:	Won't Fix
Priority:	Minor
Assignee:	Arjohn Kampman
Reporter:	Simon Schenk
Votes:	0
Watchers:	0

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SPARQL Parser unescapes backslashes twice

Created: 18/Nov/08 05:27 PM Updated: 17/Dec/08 02:06 PM

Component/s:

SPARQL

Affects Version/s:

3.x

Fix Version/s:

None

Description

The SPARQL Parser double-unescapes backslashes. Example:

public void testBackslashParsing() throws MalformedQueryException {
String query = "SELECT * WHERE {?s ?p \"\\\\\"}";
SPARQLParser parser = new SPARQLParser();
ParsedQuery pq = parser.parseQuery(query, null);
Projection proj = (Projection)pq.getTupleExpr();
StatementPattern sp = (StatementPattern)proj.getArg();
// succeeds:
assertEquals(sp.getObjectVar().getValue().stringValue(), "\\");
// fails:
assertEquals(sp.getObjectVar().getValue().stringValue(), "\\\\");
}

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[ Permlink ]

Comment by Herko ter Horst [18/Nov/08 05:41 PM]

Unless I'm very much mistaken, \ is a SPARQL escape character as well as a Java escape character, so your query actually contains only a single backslash.

[ Permlink ]

Comment by Simon Schenk [19/Nov/08 07:41 AM]

Right, it is.

[ Permlink ]

Comment by Arjohn Kampman [19/Nov/08 10:03 AM]

Issue is invalid: the double un-escape is correct, since it's a combination of Java-escapes and SPARQL-escapes.