+const filter_hook_t *filter_run(const filter_t *filter, const query_t *query,
+ filter_context_t *context);
+
+__attribute__((nonnull(1,2)))
+bool filter_test(const filter_t *filter, const query_t *query,
+ filter_context_t *context, filter_result_t expt);
+
+
+/* Parsing Helpers
+ */
+
+#define FILTER_PARAM_PARSE_STRING(Param, Dest) \
+ case ATK_ ## Param: { \
+ (Dest) = param->value; \
+ } break
+
+#define FILTER_PARAM_PARSE_INT(Param, Dest) \
+ case ATK_ ## Param: { \
+ char *next; \
+ (Dest) = strtol(param->value, &next, 10); \
+ PARSE_CHECK(!*next, "invalid %s value %.*s", atokens[ATK_ ## Param], \
+ param->value_len, param->value); \
+ } break
+
+#define FILTER_PARAM_PARSE_BOOLEAN(Param, Dest) \
+ case ATK_ ## Param: { \
+ if (param->value_len == 1 && param->value[0] == '1') { \
+ (Dest) = true; \
+ } else if (param->value_len == 1 && param->value[0] == '0') { \
+ (Dest) = false; \
+ } else if (param->value_len == 4 \
+ && ascii_tolower(param->value[0]) == 't') { \
+ (Dest) = ascii_tolower(param->value[1]) == 'r' \
+ && ascii_tolower(param->value[2]) == 'u' \
+ && ascii_tolower(param->value[3]) == 'e'; \
+ } else if (param->value_len == 5 \
+ && ascii_tolower(param->value[0]) == 'f') { \
+ (Dest) = ascii_tolower(param->value[1]) == 'a' \
+ && ascii_tolower(param->value[2]) == 'l' \
+ && ascii_tolower(param->value[3]) == 's' \
+ && ascii_tolower(param->value[4]) == 'e'; \
+ } else { \
+ PARSE_CHECK(false, "invalid %s value %.*s", atokens[ATK_ ## Param],\
+ param->value_len, param->value); \
+ } \
+ } break
+
+
+/* Filter context
+ */
+
+__attribute__((nonnull))
+void filter_context_prepare(filter_context_t *context, void* qctx);
+
+__attribute__((nonnull))
+void filter_context_wipe(filter_context_t *context);