#ifndef TREE_SITTER_TREE_CURSOR_H_
#define TREE_SITTER_TREE_CURSOR_H_

#include "./subtree.h"

typedef struct TreeCursorEntry
{
	const Subtree *subtree;
	Length		   position;
	uint32_t	   child_index;
	uint32_t	   structural_child_index;
	uint32_t	   descendant_index;
} TreeCursorEntry;

typedef struct TreeCursor
{
	const TSTree *tree;
	Array(TreeCursorEntry) stack;
	TSSymbol root_alias_symbol;
} TreeCursor;

typedef enum TreeCursorStep
{
	TreeCursorStepNone,
	TreeCursorStepHidden,
	TreeCursorStepVisible,
} TreeCursorStep;

void ts_tree_cursor_init(TreeCursor *, TSNode);
void ts_tree_cursor_current_status(const TSTreeCursor *, TSFieldId *, bool *, bool *, bool *, TSSymbol *, unsigned *);

TreeCursorStep ts_tree_cursor_goto_first_child_internal(TSTreeCursor *);
TreeCursorStep ts_tree_cursor_goto_next_sibling_internal(TSTreeCursor *);

static inline Subtree ts_tree_cursor_current_subtree(const TSTreeCursor *_self)
{
	const TreeCursor *self = (const TreeCursor *)_self;
	TreeCursorEntry	 *last_entry = array_back(&self->stack);
	return *last_entry->subtree;
}

TSNode ts_tree_cursor_parent_node(const TSTreeCursor *);

#endif // TREE_SITTER_TREE_CURSOR_H_