data: Added sdb_data_expr_type().

[sysdb.git] / src / core / data.c

diff --git a/src/core/data.c b/src/core/data.c
index 2994b5f50d3e18348dd183a553c719322e48002c..8754f8868a11471fe1e359cee75ac0d52b87721d 100644 (file)
--- a/src/core/data.c
+++ b/src/core/data.c
@@ -46,6 +46,77 @@
 
 #include <math.h>
 
+/*
+ * Operator support maxtrix.
+ * <type1> <op> <type2> -> op_matrix[<op>][<type1>][<type2>]
+ */
+
+/* add, sub, mul, div, mod, concat */
+
+/* integer, decimal, string, datetime, binary, regex */
+
+static int op_matrix[6][6][6] = {
+       /* SDB_DATA_ADD */
+       {
+               { SDB_TYPE_INTEGER, -1, -1, -1, -1, -1 },
+               { -1, SDB_TYPE_DECIMAL, -1, -1, -1, -1 },
+               { -1, -1, -1, -1, -1, -1 },
+               { -1, -1, -1, SDB_TYPE_DATETIME, -1, -1 },
+               { -1, -1, -1, -1, -1, -1 },
+               { -1, -1, -1, -1, -1, -1 },
+       },
+
+       /* SDB_DATA_SUB */
+       {
+               { SDB_TYPE_INTEGER, -1, -1, -1, -1, -1 },
+               { -1, SDB_TYPE_DECIMAL, -1, -1, -1, -1 },
+               { -1, -1, -1, -1, -1, -1 },
+               { -1, -1, -1, SDB_TYPE_DATETIME, -1, -1 },
+               { -1, -1, -1, -1, -1, -1 },
+               { -1, -1, -1, -1, -1, -1 },
+       },
+
+       /* SDB_DATA_MUL */
+       {
+               { SDB_TYPE_INTEGER, -1, -1, SDB_TYPE_DATETIME, -1, -1 },
+               { -1, SDB_TYPE_DECIMAL, -1, SDB_TYPE_DATETIME, -1, -1 },
+               { -1, -1, -1, -1, -1, -1 },
+               { SDB_TYPE_DATETIME, SDB_TYPE_DATETIME, -1, SDB_TYPE_DATETIME, -1, -1 },
+               { -1, -1, -1, -1, -1, -1 },
+               { -1, -1, -1, -1, -1, -1 },
+       },
+
+       /* SDB_DATA_DIV */
+       {
+               { SDB_TYPE_INTEGER, -1, -1, -1, -1, -1 },
+               { -1, SDB_TYPE_DECIMAL, -1, -1, -1, -1 },
+               { -1, -1, -1, -1, -1, -1 },
+               { SDB_TYPE_DATETIME, SDB_TYPE_DATETIME, -1, SDB_TYPE_DATETIME, -1, -1 },
+               { -1, -1, -1, -1, -1, -1 },
+               { -1, -1, -1, -1, -1, -1 },
+       },
+
+       /* SDB_DATA_MOD */
+       {
+               { SDB_TYPE_INTEGER, -1, -1, -1, -1, -1 },
+               { -1, SDB_TYPE_DECIMAL, -1, -1, -1, -1 },
+               { -1, -1, -1, -1, -1, -1 },
+               { SDB_TYPE_DATETIME, SDB_TYPE_DATETIME, -1, SDB_TYPE_DATETIME, -1, -1 },
+               { -1, -1, -1, -1, -1, -1 },
+               { -1, -1, -1, -1, -1, -1 },
+       },
+
+       /* SDB_DATA_CONCAT */
+       {
+               { -1, -1, -1, -1, -1, -1 },
+               { -1, -1, -1, -1, -1, -1 },
+               { -1, -1, SDB_TYPE_STRING, -1, -1, -1 },
+               { -1, -1, -1, -1, -1, -1 },
+               { -1, -1, -1, -1, SDB_TYPE_BINARY, -1 },
+               { -1, -1, -1, -1, -1, -1 },
+       },
+};
+
 /*
  * private helper functions
  */
@@ -624,6 +695,32 @@ sdb_data_expr_eval(int op, const sdb_data_t *d1, const sdb_data_t *d2,
        return -1;
 } /* sdb_data_expr_eval */
 
+int
+sdb_data_expr_type(int op, int type1, int type2)
+{
+       int types_num = (int)SDB_STATIC_ARRAY_LEN(op_matrix[0]);
+
+       assert(SDB_STATIC_ARRAY_LEN(op_matrix[0])
+                       == SDB_STATIC_ARRAY_LEN(op_matrix[0][0]));
+
+       if ((op <= 0) || (SDB_STATIC_ARRAY_LEN(op_matrix) < (size_t)op))
+               return -1;
+
+       /* arrays only support concat; type has to match */
+       if ((type1 & SDB_TYPE_ARRAY) || (type2 & SDB_TYPE_ARRAY)) {
+               if ((type1 != type2) || (op != SDB_DATA_CONCAT))
+                       return -1;
+               return type1;
+       }
+       if ((type1 < 0) || (types_num < type1)
+                       || (type2 < 0) || (types_num < type2))
+               return -1;
+
+       if ((type1 == SDB_TYPE_NULL) || (type2 == SDB_TYPE_NULL))
+               return SDB_TYPE_NULL;
+       return op_matrix[op - 1][type1 - 1][type2 - 1];
+} /* sdb_data_expr_type */
+
 size_t
 sdb_data_strlen(const sdb_data_t *datum)
 {