lean2/src/library/bin_app.cpp

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/*
Copyright (c) 2014 Microsoft Corporation. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Author: Leonardo de Moura
*/
#include "library/bin_app.h"
namespace lean {
bool is_bin_app(expr const & t, expr const & f) {
return is_app(t) && is_app(app_fn(t)) && app_fn(app_fn(t)) == f;
}
bool is_bin_app(expr const & t, expr const & f, expr & lhs, expr & rhs) {
if (is_bin_app(t, f)) {
lhs = app_arg(app_fn(t));
rhs = app_arg(t);
return true;
} else {
return false;
}
}
expr mk_bin_rop(expr const & op, expr const & unit, unsigned num_args, expr const * args) {
if (num_args == 0) {
return unit;
} else {
expr r = args[num_args - 1];
unsigned i = num_args - 1;
while (i > 0) {
--i;
r = mk_app(op, args[i], r);
}
return r;
}
}
expr mk_bin_rop(expr const & op, expr const & unit, std::initializer_list<expr> const & l) {
return mk_bin_rop(op, unit, l.size(), l.begin());
}
expr mk_bin_lop(expr const & op, expr const & unit, unsigned num_args, expr const * args) {
if (num_args == 0) {
return unit;
} else {
expr r = args[0];
for (unsigned i = 1; i < num_args; i++) {
r = mk_app(op, r, args[i]);
}
return r;
}
}
expr mk_bin_lop(expr const & op, expr const & unit, std::initializer_list<expr> const & l) {
return mk_bin_lop(op, unit, l.size(), l.begin());
}
}