#ifndef COMPILER_BUILD_TABLES_FIRST_SET_H_
#define COMPILER_BUILD_TABLES_FIRST_SET_H_

#include <set>
#include "compiler/build_tables/parse_item.h"
#include "compiler/rules/symbol.h"

namespace tree_sitter {
    class PreparedGrammar;

    namespace build_tables {

        /*
         *  Returns the set of terminal symbols that can appear at
         *  the beginning of a string derivable from a given rule,
         *  in a given gramamr.
         */
        std::set<rules::Symbol>
        first_set(const rules::rule_ptr &rule, const PreparedGrammar &grammar);

        /*
         *  Returns the set of terminal symbols that can appear at
         *  the beginning of any item in the given set.
         */
        std::set<rules::Symbol>
        first_set(const ParseItemSet &item_set, const PreparedGrammar &grammar);
    }
}

#endif  // COMPILER_BUILD_TABLES_FIRST_SET_H_