/
astconv_util.rs
70 lines (63 loc) · 2.32 KB
/
astconv_util.rs
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// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
/*!
* This module contains a simple utility routine
* used by both `typeck` and `const_eval`.
* Almost certainly this could (and should) be refactored out of existence.
*/
use middle::def;
use middle::ty::{self, Ty};
use syntax::ast;
use util::ppaux::Repr;
pub const NO_REGIONS: uint = 1;
pub const NO_TPS: uint = 2;
pub fn check_path_args(tcx: &ty::ctxt,
path: &ast::Path,
flags: uint) {
if (flags & NO_TPS) != 0 {
if path.segments.iter().any(|s| s.parameters.has_types()) {
span_err!(tcx.sess, path.span, E0109,
"type parameters are not allowed on this type");
}
}
if (flags & NO_REGIONS) != 0 {
if path.segments.iter().any(|s| s.parameters.has_lifetimes()) {
span_err!(tcx.sess, path.span, E0110,
"lifetime parameters are not allowed on this type");
}
}
}
pub fn ast_ty_to_prim_ty<'tcx>(tcx: &ty::ctxt<'tcx>, ast_ty: &ast::Ty)
-> Option<Ty<'tcx>> {
if let ast::TyPath(ref path) = ast_ty.node {
let def = match tcx.def_map.borrow().get(&ast_ty.id) {
None => {
tcx.sess.span_bug(ast_ty.span,
&format!("unbound path {}", path.repr(tcx)))
}
Some(&d) => d
};
if let def::DefPrimTy(nty) = def {
check_path_args(tcx, path, NO_TPS | NO_REGIONS);
Some(match nty {
ast::TyBool => tcx.types.bool,
ast::TyChar => tcx.types.char,
ast::TyInt(it) => ty::mk_mach_int(tcx, it),
ast::TyUint(uit) => ty::mk_mach_uint(tcx, uit),
ast::TyFloat(ft) => ty::mk_mach_float(tcx, ft),
ast::TyStr => ty::mk_str(tcx)
})
} else {
None
}
} else {
None
}
}