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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 hir::def::Def;
use ty::{Ty, TyCtxt};
use syntax::codemap::Span;
use hir as ast;
pub fn prohibit_type_params(tcx: &TyCtxt, segments: &[ast::PathSegment]) {
for segment in segments {
for typ in segment.parameters.types() {
span_err!(tcx.sess, typ.span, E0109,
"type parameters are not allowed on this type");
break;
}
for lifetime in segment.parameters.lifetimes() {
span_err!(tcx.sess, lifetime.span, E0110,
"lifetime parameters are not allowed on this type");
break;
}
for binding in segment.parameters.bindings() {
prohibit_projection(tcx, binding.span);
break;
}
}
}
pub fn prohibit_projection(tcx: &TyCtxt, span: Span)
{
span_err!(tcx.sess, span, E0229,
"associated type bindings are not allowed here");
}
pub fn prim_ty_to_ty<'tcx>(tcx: &TyCtxt<'tcx>,
segments: &[ast::PathSegment],
nty: ast::PrimTy)
-> Ty<'tcx> {
prohibit_type_params(tcx, segments);
match nty {
ast::TyBool => tcx.types.bool,
ast::TyChar => tcx.types.char,
ast::TyInt(it) => tcx.mk_mach_int(it),
ast::TyUint(uit) => tcx.mk_mach_uint(uit),
ast::TyFloat(ft) => tcx.mk_mach_float(ft),
ast::TyStr => tcx.mk_str()
}
}
/// If a type in the AST is a primitive type, return the ty::Ty corresponding
/// to it.
pub fn ast_ty_to_prim_ty<'tcx>(tcx: &TyCtxt<'tcx>, ast_ty: &ast::Ty)
-> Option<Ty<'tcx>> {
if let ast::TyPath(None, ref path) = ast_ty.node {
let def = match tcx.def_map.borrow().get(&ast_ty.id) {
None => {
span_bug!(ast_ty.span, "unbound path {:?}", path)
}
Some(d) => d.full_def()
};
if let Def::PrimTy(nty) = def {
Some(prim_ty_to_ty(tcx, &path.segments, nty))
} else {
None
}
} else {
None
}
}
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