/**************************************************************************/
/*  xml_parser.h                                                          */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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#ifndef XML_PARSER_H
#define XML_PARSER_H

#include "core/io/file_access.h"
#include "core/object/ref_counted.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 RefCounted {
	GDCLASS(XMLParser, RefCounted);

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_copy = nullptr;
	const char *data = nullptr;
	const char *P = nullptr;
	uint64_t length = 0;
	uint64_t current_line = 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(const char *start, const 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();

	_FORCE_INLINE_ void next_char() {
		if (*P == '\n') {
			current_line++;
		}
		P++;
	}

	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_named_attribute_value(const String &p_name) const;
	String get_named_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);
	Error _open_buffer(const uint8_t *p_buffer, size_t p_size);

	void close();

	~XMLParser();
};

VARIANT_ENUM_CAST(XMLParser::NodeType);

#endif // XML_PARSER_H
