[tracker: 3/4] SPARQL: Add support for INSERT/DELETE DATA

[Jürg Billeter <juergbi src gnome org>]

commit 6eef23448de86b797967f3d8c1351c968122d7fb
Author: Jürg Billeter <j bitron ch>
Date:   Wed Dec 22 10:59:49 2010 +0100

    SPARQL: Add support for INSERT/DELETE DATA

 src/libtracker-data/tracker-sparql-query.vala   |   28 +++++++++++++++++-----
 src/libtracker-data/tracker-sparql-scanner.vala |    5 ++++
 2 files changed, 26 insertions(+), 7 deletions(-)
---
diff --git a/src/libtracker-data/tracker-sparql-query.vala b/src/libtracker-data/tracker-sparql-query.vala
index 31f0663..e4be8b6 100644
--- a/src/libtracker-data/tracker-sparql-query.vala
+++ b/src/libtracker-data/tracker-sparql-query.vala
@@ -634,18 +634,30 @@ public class Tracker.Sparql.Query : Object {
 			}
 		}
 
+		// INSERT/DELETE DATA are simpler variants that don't support variables
+		bool data = (current_graph == null && accept (SparqlTokenType.DATA));
+
 		var pattern_sql = new StringBuilder ();
 
 		var sql = new StringBuilder ();
 
 		var template_location = get_location ();
-		skip_braces ();
 
-		if (accept (SparqlTokenType.WHERE)) {
-			pattern.current_graph = current_graph;
-			context = pattern.translate_group_graph_pattern (pattern_sql);
-			pattern.current_graph = null;
+		if (!data) {
+			skip_braces ();
+
+			if (accept (SparqlTokenType.WHERE)) {
+				pattern.current_graph = current_graph;
+				context = pattern.translate_group_graph_pattern (pattern_sql);
+				pattern.current_graph = null;
+			} else {
+				context = new Context (this);
+
+				pattern_sql.append ("SELECT 1");
+			}
 		} else {
+			// WHERE pattern not supported for INSERT/DELETE DATA
+
 			context = new Context (this);
 
 			pattern_sql.append ("SELECT 1");
@@ -719,8 +731,10 @@ public class Tracker.Sparql.Query : Object {
 			} while (result_set.iter_next ());
 		}
 
-		// reset location to the end of the update
-		set_location (after_where);
+		if (!data) {
+			// reset location to the end of the update
+			set_location (after_where);
+		}
 
 		// ensure possible WHERE clause in next part gets the correct results
 		Data.update_buffer_flush ();
diff --git a/src/libtracker-data/tracker-sparql-scanner.vala b/src/libtracker-data/tracker-sparql-scanner.vala
index 61b4782..cff636f 100644
--- a/src/libtracker-data/tracker-sparql-scanner.vala
+++ b/src/libtracker-data/tracker-sparql-scanner.vala
@@ -130,6 +130,10 @@ public class Tracker.SparqlScanner : Object {
 			case 'D':
 			case 'd':
 				switch (begin[1]) {
+				case 'A':
+				case 'a':
+					if (matches (begin, "DATA")) return SparqlTokenType.DATA;
+					break;
 				case 'E':
 				case 'e':
 					if (matches (begin, "DESC")) return SparqlTokenType.DESC;
@@ -839,6 +843,7 @@ public enum Tracker.SparqlTokenType {
 	COMMA,
 	CONSTRUCT,
 	COUNT,
+	DATA,
 	DATATYPE,
 	DECIMAL,
 	DELETE,