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chore(library): remove unnecessary code

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Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
This commit is contained in:
Leonardo de Moura 2014-06-02 16:22:38 -07:00
parent 33bbcd9526
commit 1467bb256e
2 changed files with 0 additions and 128 deletions
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114
src/library/fo_unify.cpp
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@ -1,114 +0,0 @@
/*
Copyright (c) 2013 Microsoft Corporation. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Author: Leonardo de Moura
*/
#include <utility>
#include "kernel/kernel.h"
#include "library/fo_unify.h"
#include "library/expr_pair.h"
#include "library/kernel_bindings.h"
#include "library/equality.h"
namespace lean {
static void assign(substitution & s, expr const & mvar, expr const & e) {
lean_assert(is_metavar(mvar));
s.insert(metavar_name(mvar), e);
}
static bool is_metavar_wo_local_context(expr const & e) {
return is_metavar(e) && !metavar_lctx(e);
}
optional<substitution> fo_unify(expr e1, expr e2) {
substitution s;
unsigned i1, i2;
buffer<expr_pair> todo;
todo.emplace_back(e1, e2);
while (!todo.empty()) {
auto p = todo.back();
todo.pop_back();
e1 = find(s, p.first);
e2 = find(s, p.second);
if (e1 != e2) {
if (is_metavar_wo_local_context(e1)) {
assign(s, e1, e2);
} else if (is_metavar_wo_local_context(e2)) {
assign(s, e2, e1);
} else if (is_equality(e1) && is_equality(e2)) {
expr_pair p1 = get_equality_args(e1);
expr_pair p2 = get_equality_args(e2);
todo.emplace_back(p1.second, p2.second);
todo.emplace_back(p1.first, p2.first);
} else {
if (e1.kind() != e2.kind())
return optional<substitution>();
switch (e1.kind()) {
case expr_kind::Var: case expr_kind::Constant: case expr_kind::Type: case expr_kind::Value: case expr_kind::MetaVar:
return optional<substitution>();
case expr_kind::App:
i1 = num_args(e1);
i2 = num_args(e2);
while (i1 > 0 && i2 > 0) {
--i1;
--i2;
if (i1 == 0 && i2 > 0) {
todo.emplace_back(arg(e1, i1), mk_app(i2+1, begin_args(e2)));
} else if (i2 == 0 && i1 > 0) {
todo.emplace_back(mk_app(i1+1, begin_args(e1)), arg(e2, i2));
} else {
todo.emplace_back(arg(e1, i1), arg(e2, i2));
}
}
break;
case expr_kind::HEq:
todo.emplace_back(heq_lhs(e1), heq_lhs(e2));
todo.emplace_back(heq_rhs(e1), heq_rhs(e2));
break;
case expr_kind::Proj:
if (proj_first(e1) != proj_first(e2))
return optional<substitution>();
todo.emplace_back(proj_arg(e1), proj_arg(e2));
break;
case expr_kind::Pair:
todo.emplace_back(pair_first(e1), pair_first(e2));
todo.emplace_back(pair_second(e1), pair_second(e2));
todo.emplace_back(pair_type(e1), pair_type(e2));
break;
case expr_kind::Lambda: case expr_kind::Pi: case expr_kind::Sigma:
todo.emplace_back(abst_body(e1), abst_body(e2));
todo.emplace_back(abst_domain(e1), abst_domain(e2));
break;
case expr_kind::Let:
todo.emplace_back(let_body(e1), let_body(e2));
todo.emplace_back(let_value(e1), let_value(e2));
if (static_cast<bool>(let_type(e1)) != static_cast<bool>(let_type(e2)))
return optional<substitution>();
if (let_type(e1)) {
lean_assert(let_type(e2));
todo.emplace_back(*let_type(e1), *let_type(e2));
}
break;
}
}
}
}
return optional<substitution>(s);
}
static int fo_unify(lua_State * L) {
optional<substitution> r = fo_unify(to_expr(L, 1), to_expr(L, 2));
if (!r) {
lua_pushnil(L);
return 1;
} else {
return push_substitution(L, *r);
}
}
void open_fo_unify(lua_State * L) {
SET_GLOBAL_FUN(fo_unify, "fo_unify");
}
}

14
src/library/fo_unify.h
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@ -1,14 +0,0 @@
/*
Copyright (c) 2013 Microsoft Corporation. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Author: Leonardo de Moura
*/
#pragma once
#include "util/optional.h"
#include "library/substitution.h"
namespace lean {
optional<substitution> fo_unify(expr e1, expr e2);
void open_fo_unify(lua_State * L);
}