src/ielr.h

   1 /* IELR main implementation.
   2
   3    Copyright (C) 2009-2015, 2018-2021 Free Software Foundation, Inc.
   4
   5    This file is part of Bison, the GNU Compiler Compiler.
   6
   7    This program is free software: you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation, either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  19
  20 #ifndef IELR_H_
  21 # define IELR_H_
  22
  23 # include <bitset.h>
  24
  25 # include "state.h"
  26
  27 /**
  28  * \pre
  29  *   - \c ::states is of size \c ::nstates and defines an LR(0) parser
  30  *     for the users's grammar.
  31  *   - \c ::ntokens is the number of tokens in the grammar.
  32  * \post
  33  *   - \c ::states is of size \c ::nstates (which might be greater than
  34  *     <tt>::nstates \@pre</tt>) and defines the type of parser specified by
  35  *     the value of the \c \%define variable \c lr.type.  Its value can be:
  36  *     - \c "lalr".
  37  *     - \c "ielr".
  38  *     - \c "canonical-lr".
  39  */
  40 void ielr (void);
  41
  42 bool ielr_item_has_lookahead (state *s, symbol_number lhs, size_t item,
  43                               symbol_number lookahead, state ***predecessors,
  44                               bitset **item_lookahead_sets);
  45
  46 #endif /* !IELR_H_ */