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Remove unused function match_ty_unwrap

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Anthony Ramine 2017-02-27 14:37:26 +01:00
parent 29e3347242
commit 7b334d84be
1 changed files with 0 additions and 31 deletions
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31
components/script_plugins/utils.rs
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@ -4,38 +4,7 @@
use rustc::hir::def_id::DefId;
use rustc::lint::{LateContext, LintContext};
use syntax::ast;
use syntax::codemap::{ExpnFormat, Span};
use syntax::ptr::P;
/// Matches a type with a provided string, and returns its type parameters if successful
pub fn match_ty_unwrap<'a>(ty: &'a ast::Ty, segments: &[&str]) -> Option<&'a [P<ast::Ty>]> {
match ty.node {
ast::TyKind::Path(_, ast::Path { segments: ref seg, .. }) => {
// So hir::Path isn't the full path, just the tokens that were provided.
// I could muck around with the maps and find the full path
// however the more efficient way is to simply reverse the iterators and zip them
// which will compare them in reverse until one of them runs out of segments
if seg.iter().rev().zip(segments.iter().rev()).all(|(a, b)| &*a.identifier.name.as_str() == *b) {
match seg.last() {
Some(&ast::PathSegment { parameters: Some(ref params), .. }) => {
match **params {
ast::PathParameters::AngleBracketed(ref a) => Some(&a.types),
// `Foo(A,B) -> C`
ast::PathParameters::Parenthesized(_) => None,
}
}
Some(&ast::PathSegment { parameters: None, .. }) => Some(&[]),
None => None,
}
} else {
None
}
},
_ => None
}
}
/// check if a DefId's path matches the given absolute type path
/// usage e.g. with