[tracker/wip/carlosg/sparql1.1: 29/113] libtracker-data: Implement BNODE sparql function

[Carlos Garnacho <carlosg src gnome org>]

commit 5b4b51765c872a2a58c05ffc5e13a5247e838adb
Author: Carlos Garnacho <carlosg gnome org>
Date:   Thu Jun 6 02:21:16 2019 +0200

    libtracker-data: Implement BNODE sparql function

 src/libtracker-data/tracker-db-interface-sqlite.c |  1 +
 src/libtracker-data/tracker-sparql.c              | 28 ++++++++++++++++++-----
 2 files changed, 23 insertions(+), 6 deletions(-)
---
diff --git a/src/libtracker-data/tracker-db-interface-sqlite.c 
b/src/libtracker-data/tracker-db-interface-sqlite.c
index 32d4a20c3..a6bbda42a 100644
--- a/src/libtracker-data/tracker-db-interface-sqlite.c
+++ b/src/libtracker-data/tracker-db-interface-sqlite.c
@@ -1741,6 +1741,7 @@ initialize_functions (TrackerDBInterface *db_interface)
                { "SparqlRand", 0, SQLITE_ANY, function_sparql_rand },
                /* UUID */
                { "SparqlUUID", 0, SQLITE_ANY, function_sparql_uuid },
+               { "SparqlBNODE", -1, SQLITE_ANY | SQLITE_DETERMINISTIC, function_sparql_uuid },
        };
 
        for (i = 0; i < G_N_ELEMENTS (functions); i++) {
diff --git a/src/libtracker-data/tracker-sparql.c b/src/libtracker-data/tracker-sparql.c
index c0e70d113..f4d807f0a 100644
--- a/src/libtracker-data/tracker-sparql.c
+++ b/src/libtracker-data/tracker-sparql.c
@@ -724,25 +724,30 @@ _convert_terminal (TrackerSparql *sparql)
 {
        const TrackerGrammarRule *rule;
        TrackerBinding *binding;
+       gboolean is_parameter;
+       GHashTable *ht;
        gchar *str;
 
        str = _dup_last_string (sparql);
        g_assert (str != NULL);
 
        rule = tracker_parser_node_get_rule (sparql->current_state.prev_node);
+       is_parameter = tracker_grammar_rule_is_a (rule, RULE_TYPE_TERMINAL,
+                                                 TERMINAL_TYPE_PARAMETERIZED_VAR);
+       ht = is_parameter ? sparql->parameters : sparql->cached_bindings;
 
-       binding = g_hash_table_lookup (sparql->cached_bindings, str);
+       binding = g_hash_table_lookup (ht, str);
        if (binding)
-               return binding;
+               return g_object_ref (binding);
 
-       if (tracker_grammar_rule_is_a (rule, RULE_TYPE_TERMINAL, TERMINAL_TYPE_PARAMETERIZED_VAR)) {
+       if (is_parameter) {
                binding = tracker_parameter_binding_new (str, NULL);
        } else {
                binding = tracker_literal_binding_new (str, NULL);
                tracker_binding_set_data_type (binding, sparql->current_state.expression_type);
        }
 
-       g_hash_table_insert (sparql->cached_bindings, str, g_object_ref (binding));
+       g_hash_table_insert (ht, str, g_object_ref (binding));
 
        return binding;
 }
@@ -6158,7 +6163,17 @@ translate_BuiltInCall (TrackerSparql  *sparql,
                _append_string (sparql, "IS NOT NULL) ");
                sparql->current_state.expression_type = TRACKER_PROPERTY_TYPE_BOOLEAN;
        } else if (_accept (sparql, RULE_TYPE_LITERAL, LITERAL_BNODE)) {
-               _unimplemented ("BNODE");
+               if (_accept (sparql, RULE_TYPE_TERMINAL, TERMINAL_TYPE_NIL)) {
+                       _append_string (sparql, "SparqlUUID() ");
+               } else {
+                       _append_string (sparql, "SparqlBNODE( ");
+                       _expect (sparql, RULE_TYPE_LITERAL, LITERAL_OPEN_PARENS);
+                       _call_rule (sparql, NAMED_RULE_Expression, error);
+                       _expect (sparql, RULE_TYPE_LITERAL, LITERAL_CLOSE_PARENS);
+                       _append_string (sparql, ") ");
+               }
+
+               sparql->current_state.expression_type = TRACKER_PROPERTY_TYPE_STRING;
        } else if (_accept (sparql, RULE_TYPE_LITERAL, LITERAL_RAND)) {
                _expect (sparql, RULE_TYPE_TERMINAL, TERMINAL_TYPE_NIL);
                _append_string (sparql, "SparqlRand() ");
@@ -6924,7 +6939,8 @@ tracker_sparql_init (TrackerSparql *sparql)
                                                    g_free, g_free);
        sparql->cached_bindings = g_hash_table_new_full (g_str_hash, g_str_equal,
                                                         g_free, g_object_unref);
-       sparql->parameters = g_hash_table_new (g_str_hash, g_str_equal);
+       sparql->parameters = g_hash_table_new_full (g_str_hash, g_str_equal,
+                                                   g_free, g_object_unref);
        sparql->var_names = g_ptr_array_new_with_free_func (g_free);
        sparql->var_types = g_array_new (FALSE, FALSE, sizeof (TrackerPropertyType));
        sparql->anon_graphs = g_ptr_array_new_with_free_func (g_free);