84 lines
2.7 KiB
Rust
84 lines
2.7 KiB
Rust
// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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/*!
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* This module contains a simple utility routine
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* used by both `typeck` and `const_eval`.
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* Almost certainly this could (and should) be refactored out of existence.
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*/
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use middle::def;
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use middle::ty::{self, Ty};
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use syntax::codemap::Span;
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use rustc_front::hir as ast;
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pub fn prohibit_type_params(tcx: &ty::ctxt, segments: &[ast::PathSegment]) {
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for segment in segments {
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for typ in segment.parameters.types() {
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span_err!(tcx.sess, typ.span, E0109,
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"type parameters are not allowed on this type");
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break;
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}
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for lifetime in segment.parameters.lifetimes() {
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span_err!(tcx.sess, lifetime.span, E0110,
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"lifetime parameters are not allowed on this type");
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break;
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}
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for binding in segment.parameters.bindings() {
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prohibit_projection(tcx, binding.span);
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break;
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}
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}
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}
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pub fn prohibit_projection(tcx: &ty::ctxt, span: Span)
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{
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span_err!(tcx.sess, span, E0229,
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"associated type bindings are not allowed here");
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}
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pub fn prim_ty_to_ty<'tcx>(tcx: &ty::ctxt<'tcx>,
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segments: &[ast::PathSegment],
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nty: ast::PrimTy)
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-> Ty<'tcx> {
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prohibit_type_params(tcx, segments);
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match nty {
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ast::TyBool => tcx.types.bool,
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ast::TyChar => tcx.types.char,
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ast::TyInt(it) => tcx.mk_mach_int(it),
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ast::TyUint(uit) => tcx.mk_mach_uint(uit),
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ast::TyFloat(ft) => tcx.mk_mach_float(ft),
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ast::TyStr => tcx.mk_str()
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}
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}
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/// If a type in the AST is a primitive type, return the ty::Ty corresponding
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/// to it.
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pub fn ast_ty_to_prim_ty<'tcx>(tcx: &ty::ctxt<'tcx>, ast_ty: &ast::Ty)
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-> Option<Ty<'tcx>> {
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if let ast::TyPath(None, ref path) = ast_ty.node {
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let def = match tcx.def_map.borrow().get(&ast_ty.id) {
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None => {
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tcx.sess.span_bug(ast_ty.span,
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&format!("unbound path {:?}", path))
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}
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Some(d) => d.full_def()
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};
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if let def::DefPrimTy(nty) = def {
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Some(prim_ty_to_ty(tcx, &path.segments, nty))
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} else {
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None
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}
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} else {
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None
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}
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}
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