65 lines
3.1 KiB
C++
65 lines
3.1 KiB
C++
/*
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Copyright (c) 2015 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Author: Leonardo de Moura
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*/
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#pragma once
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namespace lean {
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/** \brief Information for a user defined recursor */
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class recursor_info {
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name m_recursor;
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name m_type_name;
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optional<unsigned> m_motive_univ_pos; // if none, then recursor can only eliminate to Prop
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bool m_dep_elim;
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unsigned m_num_args; // total number of arguments
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unsigned m_major_pos;
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// if param is <none>, then it should be resolved by type class resolution
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list<optional<unsigned>> m_params_pos; // position of the recursor parameters in the major premise
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list<unsigned> m_indices_pos; // position of the recursor indices in the major premise
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list<bool> m_produce_motive; // "bit-map" indicating whether the i-th element is true, if
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// the i-th minor premise produces the motive
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public:
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recursor_info(name const & r, name const & I, optional<unsigned> const & motive_univ_pos,
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bool dep_elim, unsigned num_args, unsigned major_pos,
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list<optional<unsigned>> const & params_pos, list<unsigned> const & indices_pos,
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list<bool> const & produce_motive);
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recursor_info();
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name const & get_name() const { return m_recursor; }
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name const & get_type_name() const { return m_type_name; }
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unsigned get_num_args() const { return m_num_args; }
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unsigned get_num_params() const { return length(m_params_pos); }
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unsigned get_num_indices() const { return length(m_indices_pos); }
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unsigned get_motive_pos() const { return get_num_params(); }
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unsigned get_first_index_pos() const { return m_major_pos - get_num_indices(); }
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unsigned get_major_pos() const { return m_major_pos; }
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optional<unsigned> const & get_motive_univ_pos() const { return m_motive_univ_pos; }
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/** \brief Return position of the recursor parameters in the major premise. */
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list<optional<unsigned>> const & get_params_pos() const { return m_params_pos; }
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/** \brief Return position of the recursor indices in the major premise. */
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list<unsigned> const & get_indices_pos() const { return m_indices_pos; }
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list<bool> const & get_produce_motive() const { return m_produce_motive; }
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bool has_dep_elim() const { return m_dep_elim; }
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bool is_minor(unsigned pos) const;
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void write(serializer & s) const;
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static recursor_info read(deserializer & d);
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};
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environment add_user_recursor(environment const & env, name const & r, optional<unsigned> const & major_pos, bool persistent);
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recursor_info get_recursor_info(environment const & env, name const & r);
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list<name> get_recursors_for(environment const & env, name const & I);
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class has_recursors_pred {
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name_map<list<name>> m_type2recursors;
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public:
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has_recursors_pred(environment const & env);
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bool operator()(name const & n) const { return m_type2recursors.contains(n); }
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};
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void initialize_user_recursors();
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void finalize_user_recursors();
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}
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