#ifndef JSONPATH_H
#define JSONPATH_H

#include "json.h"

#include "nodes/pg_list.h"

typedef enum {
	JP_ROOT,
	JP_WILDCARD,
	JP_INDEX_SUBSCRIPT,
	JP_KEY_SUBSCRIPT,
	JP_CALL_CHAR
} jp_element_type;

typedef struct {
	jp_element_type type;

	union {
		long index;
		struct {
			char	*ptr;
			size_t	length;
		} key;
	} data;

	// If element was preceded by ".." in pattern
	bool recursive_descent;
} jp_element;

typedef enum {
	JP_REF_NODE,
	JP_REF_CHAR
} JPRefType;

typedef struct {
	JPRefType type;

	union {
		json_node *node;

		struct {
			const char *bytes;
			size_t length;
		} chr;
	} u;
} JPRef;

typedef List /* jp_element* */ JSONPath;

JSONPath *jp_parse(const char *pattern);
char *jp_show(JSONPath *jp);

List /* JPRef* */ *jp_match(JSONPath *jp, json_node *json);
void jp_set(JSONPath *jp, json_node *json, json_node *value);

/* Returns the JSON encoding of the given reference. */
char *jpref_encode(JPRef *ref);

#endif