store, frontend: Added support for matching NULL attributes.

[sysdb.git] / src / frontend / grammar.y

diff --git a/src/frontend/grammar.y b/src/frontend/grammar.y
index 34a9c6b6474502d9fc059df45a6ed93a79890567..2173e6df1b383f1ce2ce58f849cb70c37aa021c2 100644 (file)
--- a/src/frontend/grammar.y
+++ b/src/frontend/grammar.y
@@ -81,10 +81,13 @@ sdb_fe_yyerror(YYLTYPE *lval, sdb_fe_yyscan_t scanner, const char *msg);
 
 %token SCANNER_ERROR
 
-%token AND OR NOT WHERE
+%token AND OR IS NOT WHERE
 %token CMP_EQUAL CMP_NEQUAL CMP_REGEX CMP_NREGEX
 %token CMP_LT CMP_LE CMP_GE CMP_GT
 
+/* NULL token */
+%token NULL_T
+
 %token FETCH LIST LOOKUP
 
 %token <str> IDENTIFIER STRING
@@ -97,7 +100,8 @@ sdb_fe_yyerror(YYLTYPE *lval, sdb_fe_yyscan_t scanner, const char *msg);
 %right NOT
 %left CMP_EQUAL CMP_NEQUAL
 %left CMP_LT CMP_LE CMP_GE CMP_GT
-%left CMP_REGEX CMP_NREGEX
+%nonassoc CMP_REGEX CMP_NREGEX
+%nonassoc IS
 %left '(' ')'
 %left '.'
 
@@ -305,6 +309,25 @@ compare_matcher:
                        free($3); $3 = NULL;
                        sdb_data_free_datum(&$5);
                }
+       |
+       IDENTIFIER '.' IDENTIFIER IS NULL_T
+               {
+                       $$ = sdb_store_matcher_parse_cmp($1, $3, "IS", NULL);
+                       free($1); $1 = NULL;
+                       free($3); $3 = NULL;
+               }
+       |
+       IDENTIFIER '.' IDENTIFIER IS NOT NULL_T
+               {
+                       sdb_store_matcher_t *m;
+                       m = sdb_store_matcher_parse_cmp($1, $3, "IS", NULL);
+                       free($1); $1 = NULL;
+                       free($3); $3 = NULL;
+
+                       /* sdb_store_inv_matcher return NULL if m==NULL */
+                       $$ = sdb_store_inv_matcher(m);
+                       sdb_object_deref(SDB_OBJ(m));
+               }
        ;
 
 op: