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Add span method for hir::Generics struct

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This commit is contained in:
Guillaume Gomez 2016-08-03 20:42:05 +02:00
parent a0b4e67648
commit d603892ea7
1 changed files with 33 additions and 1 deletions
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34
src/librustc/hir/mod.rs
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@ -36,7 +36,7 @@ use hir::def::Def;
use hir::def_id::DefId;
use util::nodemap::{NodeMap, FnvHashSet};
use syntax_pos::{mk_sp, Span, ExpnId};
use syntax_pos::{BytePos, mk_sp, Span, ExpnId};
use syntax::codemap::{self, respan, Spanned};
use syntax::abi::Abi;
use syntax::ast::{Name, NodeId, DUMMY_NODE_ID, AsmDialect};
@ -326,6 +326,38 @@ impl Generics {
pub fn is_parameterized(&self) -> bool {
self.is_lt_parameterized() || self.is_type_parameterized()
}
// Does return a span which includes lifetimes and type parameters,
// not where clause.
pub fn span(&self) -> Option<Span> {
if !self.is_parameterized() {
None
} else {
let mut span: Option<Span> = None;
for lifetime in self.lifetimes.iter() {
if let Some(ref mut span) = span {
let life_span = lifetime.lifetime.span;
span.hi = if span.hi > life_span.hi { span.hi } else { life_span.hi };
span.lo = if span.lo < life_span.lo { span.lo } else { life_span.lo };
} else {
span = Some(lifetime.lifetime.span.clone());
}
}
for ty_param in self.ty_params.iter() {
if let Some(ref mut span) = span {
span.lo = if span.lo < ty_param.span.lo { span.lo } else { ty_param.span.lo };
span.hi = if span.hi > ty_param.span.hi { span.hi } else { ty_param.span.hi };
} else {
span = Some(ty_param.span.clone());
}
}
if let Some(ref mut span) = span {
span.lo = span.lo - BytePos(1);
span.hi = span.hi + BytePos(1);
}
span
}
}
}
/// A `where` clause in a definition