62 lines
1.8 KiB
C++
62 lines
1.8 KiB
C++
/*
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Copyright (c) 2014 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 "util/name_generator.h"
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#include "kernel/type_checker.h"
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#include "kernel/instantiate.h"
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#include "kernel/abstract.h"
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namespace lean {
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static name * g_tmp_prefix = nullptr;
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void initialize_normalize() {
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g_tmp_prefix = new name(name::mk_internal_unique_name());
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}
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void finalize_normalize() {
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delete g_tmp_prefix;
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}
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class normalize_fn {
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type_checker m_tc;
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name_generator m_ngen;
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expr normalize_binding(expr const & e) {
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expr d = normalize(binding_domain(e));
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expr l = mk_local(m_ngen.next(), binding_name(e), d, binding_info(e));
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expr b = abstract(normalize(instantiate(binding_body(e), l)), l);
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return update_binding(e, d, b);
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}
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expr normalize_app(expr const & e) {
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buffer<expr> args;
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expr f = get_app_rev_args(e, args);
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for (expr & a : args)
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a = normalize(a);
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return mk_rev_app(f, args);
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}
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expr normalize(expr e) {
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e = m_tc.whnf(e).first;
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switch (e.kind()) {
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case expr_kind::Var: case expr_kind::Constant: case expr_kind::Sort:
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case expr_kind::Meta: case expr_kind::Local: case expr_kind::Macro:
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return e;
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case expr_kind::Lambda: case expr_kind::Pi:
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return normalize_binding(e);
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case expr_kind::App:
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return normalize_app(e);
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}
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lean_unreachable(); // LCOV_EXCL_LINE
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}
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public:
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normalize_fn(environment const & env):m_tc(env), m_ngen(*g_tmp_prefix) {}
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expr operator()(expr const & e) { return normalize(e); }
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};
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expr normalize(environment const & env, expr const & e) { return normalize_fn(env)(e); }
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}
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