[tracker/wip/carlosg/sparql1.1: 182/201] libtracker-data: Honor UsingClause

[Carlos Garnacho <carlosg src gnome org>]

commit 5a8ec5adc52f0b8c78a2a8f3e281a021db016ce7
Author: Carlos Garnacho <carlosg gnome org>
Date:   Sat Sep 7 16:33:11 2019 +0200

    libtracker-data: Honor UsingClause
    
    The full syntax of Modify clause is:
    (WITH <iri>)? (DELETE {...})? (INSERT {...})? (USING ...)* (WHERE {...})?
    
    The first with is meant to affect the graphs used in the DELETE/INSERT
    parts, whereas USING is used to influence the graphs used in the WHERE{}
    clause.

 src/libtracker-data/tracker-sparql.c | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)
---
diff --git a/src/libtracker-data/tracker-sparql.c b/src/libtracker-data/tracker-sparql.c
index 4e507d99c..6c4b99fbe 100644
--- a/src/libtracker-data/tracker-sparql.c
+++ b/src/libtracker-data/tracker-sparql.c
@@ -3943,15 +3943,28 @@ static gboolean
 translate_UsingClause (TrackerSparql  *sparql,
                        GError        **error)
 {
+       gboolean named = FALSE;
+       gchar *graph;
+
        /* UsingClause ::= 'USING' ( iri | 'NAMED' iri )
         */
        _expect (sparql, RULE_TYPE_LITERAL, LITERAL_USING);
 
-       // FIXME
-       if (_accept (sparql, RULE_TYPE_LITERAL, LITERAL_NAMED)) {
-       }
+       if (_accept (sparql, RULE_TYPE_LITERAL, LITERAL_NAMED))
+               named = TRUE;
 
        _call_rule (sparql, NAMED_RULE_iri, error);
+       _init_token (&sparql->current_state.graph,
+                    sparql->current_state.prev_node, sparql);
+       graph = g_strdup (tracker_token_get_idstring (&sparql->current_state.graph));
+
+       if (named)
+               g_ptr_array_add (sparql->named_graphs, graph);
+       else
+               g_ptr_array_add (sparql->anon_graphs, graph);
+
+       tracker_token_unset (&sparql->current_state.graph);
+       g_free (graph);
 
        return TRUE;
 }