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feat(kernel/expr): add has_expr_metavar_strict

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Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
This commit is contained in:
Leonardo de Moura 2014-07-26 19:51:52 -07:00
parent d9ee994281
commit 5c5dea7c8e
2 changed files with 16 additions and 0 deletions
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14
src/kernel/expr.cpp
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@ -19,6 +19,7 @@ Author: Leonardo de Moura
#include "kernel/expr.h"
#include "kernel/expr_eq_fn.h"
#include "kernel/free_vars.h"
#include "kernel/for_each_fn.h"
#ifndef LEAN_INITIAL_EXPR_CACHE_CAPACITY
#define LEAN_INITIAL_EXPR_CACHE_CAPACITY 1024*16
@ -594,6 +595,19 @@ bool is_arrow(expr const & t) {
}
}
bool has_expr_metavar_strict(expr const & e) {
if (!has_expr_metavar(e))
return false;
bool found = false;
for_each(e, [&](expr const & e, unsigned) {
if (found || !has_expr_metavar(e)) return false;
if (is_metavar(e)) { found = true; return false; }
if (is_local(e)) return false; // do not visit type
return true;
});
return found;
}
static bool has_free_var_in_domain(expr const & b, unsigned vidx) {
if (is_pi(b)) {
return has_free_var(binding_domain(b), vidx) || has_free_var_in_domain(binding_body(b), vidx+1);

2
src/kernel/expr.h
View file

@ -585,6 +585,8 @@ inline bool is_constant(expr const & e, name const & n) { return is_constant(e)
inline bool has_metavar(expr const & e) { return e.has_metavar(); }
inline bool has_expr_metavar(expr const & e) { return e.has_expr_metavar(); }
inline bool has_univ_metavar(expr const & e) { return e.has_univ_metavar(); }
/** \brief Similar to \c has_expr_metavar, but ignores metavariables occurring in local constant types. */
bool has_expr_metavar_strict(expr const & e);
inline bool has_local(expr const & e) { return e.has_local(); }
inline bool has_param_univ(expr const & e) { return e.has_param_univ(); }
unsigned get_depth(expr const & e);