96 lines
3.9 KiB
C++
96 lines
3.9 KiB
C++
/*
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Copyright (c) 2013 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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#include <tuple>
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#include "util/interrupt.h"
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#include "kernel/replace_visitor.h"
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namespace lean {
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expr replace_visitor::visit_type(expr const & e, context const &) { lean_assert(is_type(e)); return e; }
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expr replace_visitor::visit_value(expr const & e, context const &) { lean_assert(is_value(e)); return e; }
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expr replace_visitor::visit_var(expr const & e, context const &) { lean_assert(is_var(e)); return e; }
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expr replace_visitor::visit_metavar(expr const & e, context const &) { lean_assert(is_metavar(e)); return e; }
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expr replace_visitor::visit_constant(expr const & e, context const & ctx) {
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lean_assert(is_constant(e));
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return update_const(e, visit(const_type(e), ctx));
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}
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expr replace_visitor::visit_app(expr const & e, context const & ctx) {
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lean_assert(is_app(e));
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return update_app(e, [&](expr const & c) { return visit(c, ctx); });
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}
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expr replace_visitor::visit_eq(expr const & e, context const & ctx) {
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lean_assert(is_eq(e));
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return update_eq(e, [&](expr const & l, expr const & r) { return std::make_pair(visit(l, ctx), visit(r, ctx)); });
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}
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expr replace_visitor::visit_abst(expr const & e, context const & ctx) {
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lean_assert(is_abstraction(e));
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return update_abst(e, [&](expr const & t, expr const & b) {
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expr new_t = visit(t, ctx);
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{
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cache::mk_scope sc(m_cache);
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expr new_b = visit(b, extend(ctx, abst_name(e), new_t));
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return std::make_pair(new_t, new_b);
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}
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});
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}
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expr replace_visitor::visit_lambda(expr const & e, context const & ctx) {
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lean_assert(is_lambda(e));
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return visit_abst(e, ctx);
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}
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expr replace_visitor::visit_pi(expr const & e, context const & ctx) {
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lean_assert(is_pi(e));
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return visit_abst(e, ctx);
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}
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expr replace_visitor::visit_let(expr const & e, context const & ctx) {
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lean_assert(is_let(e));
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return update_let(e, [&](optional<expr> const & t, expr const & v, expr const & b) {
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optional<expr> new_t = visit(t, ctx);
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expr new_v = visit(v, ctx);
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{
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cache::mk_scope sc(m_cache);
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expr new_b = visit(b, extend(ctx, let_name(e), new_t, new_v));
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return std::make_tuple(new_t, new_v, new_b);
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}
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});
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}
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expr replace_visitor::save_result(expr const & e, expr && r, bool shared) {
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if (shared)
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m_cache.insert(std::make_pair(e, r));
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return r;
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}
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expr replace_visitor::visit(expr const & e, context const & ctx) {
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check_system("expression replacer");
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bool shared = false;
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if (is_shared(e)) {
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shared = true;
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auto it = m_cache.find(e);
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if (it != m_cache.end())
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return it->second;
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}
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switch (e.kind()) {
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case expr_kind::Type: return save_result(e, visit_type(e, ctx), shared);
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case expr_kind::Value: return save_result(e, visit_value(e, ctx), shared);
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case expr_kind::Constant: return save_result(e, visit_constant(e, ctx), shared);
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case expr_kind::Var: return save_result(e, visit_var(e, ctx), shared);
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case expr_kind::MetaVar: return save_result(e, visit_metavar(e, ctx), shared);
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case expr_kind::App: return save_result(e, visit_app(e, ctx), shared);
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case expr_kind::Eq: return save_result(e, visit_eq(e, ctx), shared);
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case expr_kind::Lambda: return save_result(e, visit_lambda(e, ctx), shared);
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case expr_kind::Pi: return save_result(e, visit_pi(e, ctx), shared);
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case expr_kind::Let: return save_result(e, visit_let(e, ctx), shared);
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}
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lean_unreachable(); // LCOV_EXCL_LINE
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}
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optional<expr> replace_visitor::visit(optional<expr> const & e, context const & ctx) {
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if (e)
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return some_expr(visit(*e, ctx));
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else
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return none_expr();
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}
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}
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