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/* This Source Code Form is subject to the terms of the Mozilla Public
* 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::hir::def_id::DefId;
use rustc::lint::LateContext;
use syntax::codemap::{ExpnFormat, Span};
/// check if a DefId's path matches the given absolute type path
/// usage e.g. with
/// `match_def_path(cx, id, &["core", "option", "Option"])`
pub fn match_def_path(cx: &LateContext, def_id: DefId, path: &[&str]) -> bool {
let krate = &cx.tcx.crate_name(def_id.krate);
if krate != &path[0] {
return false;
}
let path = &path[1..];
let other = cx.tcx.def_path(def_id).data;
if other.len() != path.len() {
return false;
}
other.into_iter()
.map(|e| e.data)
.zip(path)
.all(|(nm, p)| nm.as_interned_str().with(|nm| nm == *p))
}
pub fn in_derive_expn(span: Span) -> bool {
if let Some(i) = span.ctxt().outer().expn_info() {
if let ExpnFormat::MacroAttribute(n) = i.callee.format {
n.as_str().contains("derive")
} else {
false
}
} else {
false
}
}
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