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feat(library/util): add more auxiliary procedures

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This commit is contained in:
Leonardo de Moura 2014-12-19 21:57:22 -08:00
parent 187f4483e9
commit 8c63045492
2 changed files with 21 additions and 0 deletions
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18
src/library/util.cpp
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@ -312,6 +312,24 @@ expr mk_heq(type_checker & tc, expr const & lhs, expr const & rhs) {
return mk_app(mk_constant(*g_heq_name, {lvl}), A, lhs, B, rhs);
}
bool is_eq_rec(expr const & e) {
expr const & fn = get_app_fn(e);
return is_constant(fn) && const_name(fn) == *g_eq_rec_name;
}
bool is_eq(expr const & e) {
expr const & fn = get_app_fn(e);
return is_constant(fn) && const_name(fn) == *g_eq_name;
}
bool is_eq_a_a(expr const & e) {
if (!is_eq(e))
return false;
buffer<expr> args;
get_app_args(e, args);
return args.size() == 3 && args[1] == args[2];
}
void mk_telescopic_eq(type_checker & tc, buffer<expr> const & t, buffer<expr> const & s, buffer<expr> & eqs) {
lean_assert(t.size() == s.size());
lean_assert(std::all_of(s.begin(), s.end(), is_local));

3
src/library/util.h
View file

@ -94,6 +94,9 @@ expr mk_pr2(type_checker & tc, expr const & p, bool prop);
expr mk_eq(type_checker & tc, expr const & lhs, expr const & rhs);
expr mk_refl(type_checker & tc, expr const & a);
bool is_eq_rec(expr const & e);
bool is_eq(expr const & e);
bool is_eq_a_a(expr const & e);
/** \brief Create a telescope equality for HoTT library.
This procedure assumes eq supports dependent elimination.