Add inheritance-checking lint

This commit is contained in:
Manish Goregaokar 2014-12-01 14:13:50 -05:00
parent 7d65673561
commit d761877ef6
9 changed files with 139 additions and 21 deletions

View file

@ -2,10 +2,17 @@
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use rustc::lint::Context;
use rustc::middle::{ty, def};
use syntax::ptr::P;
use syntax::ast;
use syntax::ast::{TyPath, Path, AngleBracketedParameters, PathSegment, Ty};
use syntax::attr::mark_used;
/// Matches a type with a provided string, and returns its type parameters if successful
///
/// Try not to use this for types defined in crates you own, use match_lang_ty instead (for lint passes)
pub fn match_ty_unwrap<'a>(ty: &'a Ty, segments: &[&str]) -> Option<&'a [P<Ty>]> {
match ty.node {
TyPath(Path {segments: ref seg, ..}, _, _) => {
@ -27,3 +34,29 @@ pub fn match_ty_unwrap<'a>(ty: &'a Ty, segments: &[&str]) -> Option<&'a [P<Ty>]>
_ => None
}
}
/// Checks if a type has a #[servo_lang = "str"] attribute
pub fn match_lang_ty(cx: &Context, ty: &Ty, value: &str) -> bool {
let mut found = false;
if let TyPath(_, _, ty_id) = ty.node {
if let Some(def::DefTy(def_id, _)) = cx.tcx.def_map.borrow().find_copy(&ty_id) {
// Iterating through attributes is hard because of cross-crate defs
ty::each_attr(cx.tcx, def_id, |attr| {
if let ast::MetaNameValue(ref name, ref val) = attr.node.value.node {
if name.get() == "servo_lang" {
if let ast::LitStr(ref v, _) = val.node {
if v.get() == value {
mark_used(attr);
found = true;
// We're done with the loop
return false;
}
}
}
}
true
});
};
}
found
}