[tracker/parser] SPARQL: Add type information for unary expressions

[Jürg Billeter <juergbi src gnome org>]

commit d6a4c544da9ce44789e63d702de475158dd3597a
Author: Jürg Billeter <j bitron ch>
Date:   Wed Aug 12 13:16:34 2009 +0200

    SPARQL: Add type information for unary expressions

 src/libtracker-data/tracker-sparql-query.vala |   18 ++++++++++--------
 1 files changed, 10 insertions(+), 8 deletions(-)
---
diff --git a/src/libtracker-data/tracker-sparql-query.vala b/src/libtracker-data/tracker-sparql-query.vala
index 9f093ba..ea6cb32 100644
--- a/src/libtracker-data/tracker-sparql-query.vala
+++ b/src/libtracker-data/tracker-sparql-query.vala
@@ -1208,22 +1208,24 @@ public class Tracker.SparqlQuery : Object {
 		}
 	}
 
-	void translate_unary_expression (StringBuilder sql) throws SparqlError {
+	DataType translate_unary_expression (StringBuilder sql) throws SparqlError {
 		if (accept (SparqlTokenType.OP_NEG)) {
 			sql.append ("NOT (");
-			translate_primary_expression (sql);
+			var optype = translate_primary_expression (sql);
 			sql.append (")");
-			return;
+			if (optype != DataType.BOOLEAN) {
+				throw new SparqlError.PARSE ("expected boolean expression");
+			}
+			return DataType.BOOLEAN;
 		} else if (accept (SparqlTokenType.PLUS)) {
-			translate_primary_expression (sql);
-			return;
+			return translate_primary_expression (sql);
 		} else if (accept (SparqlTokenType.MINUS)) {
 			sql.append ("-(");
-			translate_primary_expression (sql);
+			var optype = translate_primary_expression (sql);
 			sql.append (")");
-			return;
+			return optype;
 		}
-		translate_primary_expression (sql);
+		return translate_primary_expression (sql);
 	}
 
 	void translate_multiplicative_expression (StringBuilder sql) throws SparqlError {