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index 1bd0d5354e652656b891d0178cdf5030bf4992ec..e529fb9ceec24749aca3efdf8841bbc2dd073e23 100644 (file)
--- a/src/include/core/data.h
+++ b/src/include/core/data.h
#include "core/time.h"
#include <inttypes.h>
+#include <stdbool.h>
#include <stddef.h>
+#include <sys/types.h>
+#include <regex.h>
+
#ifdef __cplusplus
extern "C" {
#endif
enum {
- SDB_TYPE_INTEGER = 1,
+ SDB_TYPE_NULL = 0,
+ SDB_TYPE_INTEGER,
SDB_TYPE_DECIMAL,
SDB_TYPE_STRING,
SDB_TYPE_DATETIME,
SDB_TYPE_BINARY,
+ SDB_TYPE_REGEX, /* extended, case-insensitive POSIX regex */
+
+ /* flags: */
+ SDB_TYPE_ARRAY = 1 << 8,
};
#define SDB_TYPE_TO_STRING(t) \
- (((t) == SDB_TYPE_INTEGER) \
- ? "INTEGER" \
- : ((t) == SDB_TYPE_DECIMAL) \
- ? "DECIMAL" \
- : ((t) == SDB_TYPE_STRING) \
- ? "STRING" \
- : ((t) == SDB_TYPE_DATETIME) \
- ? "DATETIME" \
- : ((t) == SDB_TYPE_BINARY) \
- ? "BINARY" \
- : "UNKNOWN")
+ (((t) == SDB_TYPE_NULL) ? "NULL" \
+ : ((t) == SDB_TYPE_INTEGER) ? "INTEGER" \
+ : ((t) == SDB_TYPE_DECIMAL) ? "DECIMAL" \
+ : ((t) == SDB_TYPE_STRING) ? "STRING" \
+ : ((t) == SDB_TYPE_DATETIME) ? "DATETIME" \
+ : ((t) == SDB_TYPE_BINARY) ? "BINARY" \
+ : ((t) == SDB_TYPE_REGEX) ? "REGEX" \
+ : ((t) == (SDB_TYPE_ARRAY | SDB_TYPE_INTEGER)) ? "[]INTEGER" \
+ : ((t) == (SDB_TYPE_ARRAY | SDB_TYPE_DECIMAL)) ? "[]DECIMAL" \
+ : ((t) == (SDB_TYPE_ARRAY | SDB_TYPE_STRING)) ? "[]STRING" \
+ : ((t) == (SDB_TYPE_ARRAY | SDB_TYPE_DATETIME)) ? "[]DATETIME" \
+ : ((t) == (SDB_TYPE_ARRAY | SDB_TYPE_BINARY)) ? "[]BINARY" \
+ : ((t) == (SDB_TYPE_ARRAY | SDB_TYPE_REGEX)) ? "[]REGEX" \
+ : "UNKNOWN")
+
+union sdb_datum;
+typedef union sdb_datum sdb_datum_t;
+
+union sdb_datum {
+ int64_t integer; /* SDB_TYPE_INTEGER */
+ double decimal; /* SDB_TYPE_DECIMAL */
+ char *string; /* SDB_TYPE_STRING */
+ sdb_time_t datetime; /* SDB_TYPE_DATETIME */
+ struct {
+ size_t length;
+ unsigned char *datum;
+ } binary; /* SDB_TYPE_BINARY */
+ struct {
+ char *raw;
+ regex_t regex;
+ } re; /* SDB_TYPE_REGEX */
+
+ struct {
+ size_t length;
+ void *values;
+ } array;
+};
/*
* sdb_data_t:
- * A datum retrieved from an arbitrary data source.
+ * An arbitrary value of a specified type.
*/
typedef struct {
- int type;
- union {
- int64_t integer; /* SDB_TYPE_INTEGER */
- double decimal; /* SDB_TYPE_DECIMAL */
- char *string; /* SDB_TYPE_STRING */
- sdb_time_t datetime; /* SDB_TYPE_DATETIME */
- struct {
- size_t length;
- unsigned char *datum;
- } binary; /* SDB_TYPE_BINARY */
- } data;
+ int type; /* type of the datum */
+ sdb_datum_t data;
} sdb_data_t;
-#define SDB_DATA_INIT { 0, { .integer = 0 } }
+#define SDB_DATA_INIT { SDB_TYPE_NULL, { .integer = 0 } }
+
+extern const sdb_data_t SDB_DATA_NULL;
/*
* sdb_data_copy:
/*
* sdb_data_isnull:
* Determine whether a datum is NULL. A datum is considered to be NULL if
- * either datum is NULL or if the string or binary datum is NULL.
+ * either datum is NULL or if the type is SDB_TYPE_NULL or if the string or
+ * binary datum is NULL.
*/
-_Bool
+bool
sdb_data_isnull(const sdb_data_t *datum);
+/*
+ * sdb_data_inarray:
+ * Determine whether a datum is included in an array based on the usual
+ * comparison function of the value's type. The element type of the array has
+ * to match the type of the value. The value may be another array. In that
+ * case, the element types have to match and the function returns true if all
+ * elements of the first array are included in the second where order does not
+ * matter.
+ */
+bool
+sdb_data_inarray(const sdb_data_t *value, const sdb_data_t *array);
+
+/*
+ * sdb_data_array_get:
+ * Get the i-th value stored in the specified array and store an alias in
+ * 'value'. Storing an alias means that the value points to the actual array
+ * element. Do *not* free the value after using it (i.e., don't use
+ * sdb_data_free_datum).
+ *
+ * Returns:
+ * - 0 on success
+ * - a negative value else
+ */
+int
+sdb_data_array_get(const sdb_data_t *array, size_t i, sdb_data_t *value);
+
/*
* Operators supported by sdb_data_eval_expr.
*/
};
#define SDB_DATA_OP_TO_STRING(op) \
- (((op) == SDB_DATA_ADD) \
- ? "+" \
- : ((op) == SDB_DATA_SUB) \
- ? "-" \
- : ((op) == SDB_DATA_MUL) \
- ? "*" \
- : ((op) == SDB_DATA_DIV) \
- ? "/" \
- : ((op) == SDB_DATA_MOD) \
- ? "%" \
- : ((op) == SDB_DATA_CONCAT) \
- ? "||" : "UNKNOWN")
+ (((op) == SDB_DATA_ADD) ? "+" \
+ : ((op) == SDB_DATA_SUB) ? "-" \
+ : ((op) == SDB_DATA_MUL) ? "*" \
+ : ((op) == SDB_DATA_DIV) ? "/" \
+ : ((op) == SDB_DATA_MOD) ? "%" \
+ : ((op) == SDB_DATA_CONCAT) ? "||" : "UNKNOWN")
+
+/*
+ * sdb_data_parse_op:
+ * Parse the string representation of an operator supported by
+ * sdb_data_expr_eval.
+ *
+ * Returns:
+ * - the ID of the operator
+ * - a negative value in case the operator does not exist
+ */
+int
+sdb_data_parse_op(const char *op);
/*
* sdb_data_expr_eval:
* support the other operators. The result may be allocated dynamically and
* has to be freed by the caller (using sdb_data_free_datum).
*
+ * If any of the data points is a NULL value, the result is also NULL.
+ *
* The data-types of d1 and d2 have to be the same, except for the following
* cases:
* - <integer> or <decimal> <mul> <datetime>
sdb_data_expr_eval(int op, const sdb_data_t *d1, const sdb_data_t *d2,
sdb_data_t *res);
+/*
+ * sdb_data_expr_type:
+ * Determine the type of the expression when applying the specified operator
+ * to the specified types. Note that if an actual value is a typed NULL value
+ * (e.g. a NULL string value), the return value of this function does not
+ * match the return type of sdb_data_expr_eval.
+ *
+ * See the documentation of sdb_data_expr_eval() for a description of which
+ * operations are supported.
+ *
+ * Returns:
+ * - the type id on success
+ * - a negative value else
+ */
+int
+sdb_data_expr_type(int op, int type1, int type2);
+
/*
* sdb_data_strlen:
* Returns a (worst-case) estimate for the number of bytes required to format
* - the number of characters written to the buffer (excluding the terminated
* null byte) or the number of characters which would have been written in
* case the output was truncated
- * - a negative value else
*/
-int
+size_t
sdb_data_format(const sdb_data_t *datum, char *buf, size_t buflen, int quoted);
/*
@@ -223,17 +302,27 @@ sdb_data_format(const sdb_data_t *datum, char *buf, size_t buflen, int quoted);
* character of the string is "0"), sedecimal (base 16, if the string includes
* the "0x" prefix), or decimal. Decimal numbers may also be "infinity" or
* "NaN" or may use a decimal exponent. Date-time values are expected to be
- * specified as (floating point) number of seconds since the epoch. For string
- * and binary data, the input string is passed to the datum. The function does
- * not allocate new memory for that purpose. Use sdb_data_copy() if you want
- * to do that.
+ * specified as (floating point) number of seconds since the epoch. New memory
+ * will be allocated as necessary and will have to be free'd using
+ * sdb_data_free_datum().
*
* Returns:
* - 0 on success
* - a negative value else
*/
int
-sdb_data_parse(char *str, int type, sdb_data_t *data);
+sdb_data_parse(const char *str, int type, sdb_data_t *data);
+
+/*
+ * sdb_data_sizeof:
+ * Return the size of the data-type identified by the specified type.
+ *
+ * Returns:
+ * - the size of the data-type on success
+ * - 0 else
+ */
+size_t
+sdb_data_sizeof(int type);
#ifdef __cplusplus
} /* extern "C" */