/*************************************************************************/
/*  xml_parser.h                                                         */
/*************************************************************************/
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
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#ifndef XML_PARSER_H
#define XML_PARSER_H

#include "core/object/reference.h"
#include "core/os/file_access.h"
#include "core/string/ustring.h"
#include "core/templates/vector.h"

/*
  Based on irrXML (see their zlib license). Added mainly for compatibility with their Collada loader.
*/

class XMLParser : public Reference {
	GDCLASS(XMLParser, Reference);

public:
	//! Enumeration of all supported source text file formats
	enum SourceFormat {
		SOURCE_ASCII,
		SOURCE_UTF8,
		SOURCE_UTF16_BE,
		SOURCE_UTF16_LE,
		SOURCE_UTF32_BE,
		SOURCE_UTF32_LE
	};

	enum NodeType {
		NODE_NONE,
		NODE_ELEMENT,
		NODE_ELEMENT_END,
		NODE_TEXT,
		NODE_COMMENT,
		NODE_CDATA,
		NODE_UNKNOWN
	};

private:
	char *data = nullptr;
	char *P = nullptr;
	uint64_t length = 0;
	String node_name;
	bool node_empty = false;
	NodeType node_type = NODE_NONE;
	uint64_t node_offset = 0;

	struct Attribute {
		String name;
		String value;
	};

	Vector<Attribute> attributes;

	bool _set_text(char *start, char *end);
	void _parse_closing_xml_element();
	void _ignore_definition();
	bool _parse_cdata();
	void _parse_comment();
	void _parse_opening_xml_element();
	void _parse_current_node();

	static void _bind_methods();

public:
	Error read();
	NodeType get_node_type();
	String get_node_name() const;
	String get_node_data() const;
	uint64_t get_node_offset() const;
	int get_attribute_count() const;
	String get_attribute_name(int p_idx) const;
	String get_attribute_value(int p_idx) const;
	bool has_attribute(const String &p_name) const;
	String get_attribute_value(const String &p_name) const;
	String get_attribute_value_safe(const String &p_name) const; // do not print error if doesn't exist
	bool is_empty() const;
	int get_current_line() const;

	void skip_section();
	Error seek(uint64_t p_pos);

	Error open(const String &p_path);
	Error open_buffer(const Vector<uint8_t> &p_buffer);

	void close();

	XMLParser();
	~XMLParser();
};

#endif // XML_PARSER_H