Basic variables support.

src/nxt_var.h

@@ -0,0 +1,48 @@
+
+/*
+ * Copyright (C) NGINX, Inc.
+ */
+
+#ifndef _NXT_VAR_H_INCLUDED_
+#define _NXT_VAR_H_INCLUDED_
+
+
+typedef struct nxt_var_s        nxt_var_t;
+typedef struct nxt_var_query_s  nxt_var_query_t;
+
+
+typedef nxt_int_t (*nxt_var_handler_t)(nxt_task_t *task,
+                                       nxt_var_query_t *query,
+                                       nxt_str_t *str,
+                                       void *ctx);
+
+typedef struct {
+    nxt_str_t          name;
+    nxt_var_handler_t  handler;
+    uint32_t           index;
+} nxt_var_decl_t;
+
+
+nxt_inline nxt_bool_t
+nxt_is_var(nxt_str_t *str)
+{
+    return (nxt_memchr(str->start, '$', str->length) != NULL);
+}
+
+
+nxt_int_t nxt_var_register(nxt_var_decl_t *decl, size_t n);
+nxt_int_t nxt_var_index_init(void);
+nxt_var_t *nxt_var_compile(nxt_str_t *str, nxt_mp_t *mp);
+nxt_int_t nxt_var_test(nxt_str_t *str, u_char *error);
+
+nxt_int_t nxt_var_query_init(nxt_var_query_t **query_p, void *ctx,
+    nxt_mp_t *mp);
+void nxt_var_query(nxt_task_t *task, nxt_var_query_t *query,
+    nxt_var_t *var, nxt_str_t *str);
+void nxt_var_query_resolve(nxt_task_t *task, nxt_var_query_t *query, void *data,
+    nxt_work_handler_t ready, nxt_work_handler_t error);
+void nxt_var_query_handle(nxt_task_t *task, nxt_var_query_t *query,
+    nxt_bool_t failed);
+
+
+#endif /* _NXT_VAR_H_INCLUDED_ */