#ifndef HELP_YACC_CLASS
#define HELP_YACC_CLASS

// help_yacc: defines yacc as using a pointer to a tree for its parsing
// stack and provides a few common needs for parsing, like access to yytext.

#include "zeno_tree.h"

// YYSTYPE: stack type for yacc during parsing.
#define YYSTYPE zeno_tree *

  // yylex: the function called to obtain characters from the standard input
  // and convert them into a token number.
  int yylex();

  // yytext: the characters held in the most recently parsed token.
  extern char yytext[];

  // yylineno: the current line number in the source program, starting at 1.
  extern int yylineno;

  // yycurrent_position: the current character position within the current line
  // being parsed.
  extern int yycurrent_position;

  // yyparse: the function called to match the tokens returned by yylex()
  // against the patterns defined in the language grammar.
  int yyparse();

#endif