#ifndef FZL_PARSER_H
#define FZL_PARSER_H

#include <compiler/fzl_reader.h>
#include <compiler/fzl_token.h>
#include <stddef.h>

// AST node type
typedef enum
{
  FZL_NODETYPE_BLOCK,
  FZL_NODETYPE_CALL,
  FZL_NODETYPE_LITERAL,
} fzl_nodetype_t;

// AST node descriptor
typedef struct fzl_node
{
  fzl_nodetype_t type;
  fzl_token_t *token;
  struct fzl_node *parent;
  struct fzl_node *next;

  union
  {
    struct
    {
      struct fzl_node **entries;
      size_t entry_count;
    } list;
  };
} fzl_node_t;

// Token sequence parser descriptor
typedef struct
{
  fzl_reader_ll_t *first;
  size_t token_count;

  fzl_reader_ll_t *cursor;
  fzl_node_t *root;
} fzl_parser_t;

// Allocate parser
fzl_parser_t *fzl_mkparser(fzl_reader_ll_t *first);

// Allocate new node
fzl_node_t *fzl_mknode(fzl_nodetype_t type, fzl_token_t *tok);

// Parse tokens
int fzl_parse(fzl_parser_t *parser);

// Get last parser error
char *fzl_parser_geterror();

// Free node
void fzl_freenode(fzl_node_t *node);

// Free parser
void fzl_freeparser(fzl_parser_t *parser);

#endif // FZL_PARSER_H