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use middle::def;
use middle::ty::{mod, 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) != 0u {
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) != 0u {
if path.segments.iter().any(|s| s.parameters.has_lifetimes()) {
span_err!(tcx.sess, path.span, E0110,
"region 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>> {
match ast_ty.node {
ast::TyPath(ref path, id) => {
let a_def = match tcx.def_map.borrow().get(&id) {
None => {
tcx.sess.span_bug(ast_ty.span,
format!("unbound path {}",
path.repr(tcx))[])
}
Some(&d) => d
};
match a_def {
def::DefPrimTy(nty) => {
match nty {
ast::TyBool => {
check_path_args(tcx, path, NO_TPS | NO_REGIONS);
Some(tcx.types.bool)
}
ast::TyChar => {
check_path_args(tcx, path, NO_TPS | NO_REGIONS);
Some(tcx.types.char)
}
ast::TyInt(it) => {
check_path_args(tcx, path, NO_TPS | NO_REGIONS);
Some(ty::mk_mach_int(tcx, it))
}
ast::TyUint(uit) => {
check_path_args(tcx, path, NO_TPS | NO_REGIONS);
Some(ty::mk_mach_uint(tcx, uit))
}
ast::TyFloat(ft) => {
check_path_args(tcx, path, NO_TPS | NO_REGIONS);
Some(ty::mk_mach_float(tcx, ft))
}
ast::TyStr => {
Some(ty::mk_str(tcx))
}
}
}
_ => None
}
}
_ => None
}
}