1 // A signature is a string representation of an item's type signature, excluding
2 // any body. It also includes ids for any defs or refs in the signature. For
10 // The signature string is something like "fn foo(x: String) {}" and the signature
11 // will have defs for `foo` and `x` and a ref for `String`.
13 // All signature text should parse in the correct context (i.e., in a module or
14 // impl, etc.). Clients may want to trim trailing `{}` or `;`. The text of a
15 // signature is not guaranteed to be stable (it may improve or change as the
16 // syntax changes, or whitespace or punctuation may change). It is also likely
17 // not to be pretty - no attempt is made to prettify the text. It is recommended
18 // that clients run the text through Rustfmt.
20 // This module generates Signatures for items by walking the AST and looking up
23 // Signatures do not include visibility info. I'm not sure if this is a feature
24 // or an ommission (FIXME).
26 // FIXME where clauses need implementing, defs/refs in generics are mostly missing.
28 use crate::{id_from_def_id, id_from_hir_id, SaveContext};
30 use rls_data::{SigElement, Signature};
32 use rustc_ast::ast::Mutability;
34 use rustc_hir::def::{DefKind, Res};
35 use rustc_hir_pretty::id_to_string;
36 use rustc_hir_pretty::{bounds_to_string, path_segment_to_string, path_to_string, ty_to_string};
37 use rustc_span::symbol::{Ident, Symbol};
39 pub fn item_signature(item: &hir::Item<'_>, scx: &SaveContext<'_>) -> Option<Signature> {
40 if !scx.config.signatures {
43 item.make(0, None, scx).ok()
46 pub fn foreign_item_signature(
47 item: &hir::ForeignItem<'_>,
48 scx: &SaveContext<'_>,
49 ) -> Option<Signature> {
50 if !scx.config.signatures {
53 item.make(0, None, scx).ok()
56 /// Signature for a struct or tuple field declaration.
57 /// Does not include a trailing comma.
58 pub fn field_signature(field: &hir::StructField<'_>, scx: &SaveContext<'_>) -> Option<Signature> {
59 if !scx.config.signatures {
62 field.make(0, None, scx).ok()
65 /// Does not include a trailing comma.
66 pub fn variant_signature(variant: &hir::Variant<'_>, scx: &SaveContext<'_>) -> Option<Signature> {
67 if !scx.config.signatures {
70 variant.make(0, None, scx).ok()
73 pub fn method_signature(
76 generics: &hir::Generics<'_>,
78 scx: &SaveContext<'_>,
79 ) -> Option<Signature> {
80 if !scx.config.signatures {
83 make_method_signature(id, ident, generics, m, scx).ok()
86 pub fn assoc_const_signature(
90 default: Option<&hir::Expr<'_>>,
91 scx: &SaveContext<'_>,
92 ) -> Option<Signature> {
93 if !scx.config.signatures {
96 make_assoc_const_signature(id, ident, ty, default, scx).ok()
99 pub fn assoc_type_signature(
102 bounds: Option<hir::GenericBounds<'_>>,
103 default: Option<&hir::Ty<'_>>,
104 scx: &SaveContext<'_>,
105 ) -> Option<Signature> {
106 if !scx.config.signatures {
109 make_assoc_type_signature(id, ident, bounds, default, scx).ok()
112 type Result = std::result::Result<Signature, &'static str>;
115 fn make(&self, offset: usize, id: Option<hir::HirId>, scx: &SaveContext<'_>) -> Result;
121 defs: Vec<SigElement>,
122 refs: Vec<SigElement>,
125 sig.defs.extend(defs.into_iter());
126 sig.refs.extend(refs.into_iter());
130 fn replace_text(mut sig: Signature, text: String) -> Signature {
135 fn merge_sigs(text: String, sigs: Vec<Signature>) -> Signature {
136 let mut result = Signature { text, defs: vec![], refs: vec![] };
138 let (defs, refs): (Vec<_>, Vec<_>) = sigs.into_iter().map(|s| (s.defs, s.refs)).unzip();
140 result.defs.extend(defs.into_iter().flat_map(|ds| ds.into_iter()));
141 result.refs.extend(refs.into_iter().flat_map(|rs| rs.into_iter()));
146 fn text_sig(text: String) -> Signature {
147 Signature { text, defs: vec![], refs: vec![] }
150 impl<'hir> Sig for hir::Ty<'hir> {
151 fn make(&self, offset: usize, _parent_id: Option<hir::HirId>, scx: &SaveContext<'_>) -> Result {
152 let id = Some(self.hir_id);
154 hir::TyKind::Slice(ref ty) => {
155 let nested = ty.make(offset + 1, id, scx)?;
156 let text = format!("[{}]", nested.text);
157 Ok(replace_text(nested, text))
159 hir::TyKind::Ptr(ref mt) => {
160 let prefix = match mt.mutbl {
161 hir::Mutability::Mut => "*mut ",
162 hir::Mutability::Not => "*const ",
164 let nested = mt.ty.make(offset + prefix.len(), id, scx)?;
165 let text = format!("{}{}", prefix, nested.text);
166 Ok(replace_text(nested, text))
168 hir::TyKind::Rptr(ref lifetime, ref mt) => {
169 let mut prefix = "&".to_owned();
170 prefix.push_str(&lifetime.name.ident().to_string());
172 if let hir::Mutability::Mut = mt.mutbl {
173 prefix.push_str("mut ");
176 let nested = mt.ty.make(offset + prefix.len(), id, scx)?;
177 let text = format!("{}{}", prefix, nested.text);
178 Ok(replace_text(nested, text))
180 hir::TyKind::Never => Ok(text_sig("!".to_owned())),
181 hir::TyKind::Tup(ts) => {
182 let mut text = "(".to_owned();
183 let mut defs = vec![];
184 let mut refs = vec![];
186 let nested = t.make(offset + text.len(), id, scx)?;
187 text.push_str(&nested.text);
189 defs.extend(nested.defs.into_iter());
190 refs.extend(nested.refs.into_iter());
193 Ok(Signature { text, defs, refs })
195 hir::TyKind::BareFn(ref f) => {
196 let mut text = String::new();
197 if !f.generic_params.is_empty() {
198 // FIXME defs, bounds on lifetimes
199 text.push_str("for<");
203 .filter_map(|param| match param.kind {
204 hir::GenericParamKind::Lifetime { .. } => {
205 Some(param.name.ident().to_string())
215 if let hir::Unsafety::Unsafe = f.unsafety {
216 text.push_str("unsafe ");
218 text.push_str("fn(");
220 let mut defs = vec![];
221 let mut refs = vec![];
222 for i in f.decl.inputs {
223 let nested = i.make(offset + text.len(), Some(i.hir_id), scx)?;
224 text.push_str(&nested.text);
226 defs.extend(nested.defs.into_iter());
227 refs.extend(nested.refs.into_iter());
230 if let hir::FnRetTy::Return(ref t) = f.decl.output {
231 text.push_str(" -> ");
232 let nested = t.make(offset + text.len(), None, scx)?;
233 text.push_str(&nested.text);
235 defs.extend(nested.defs.into_iter());
236 refs.extend(nested.refs.into_iter());
239 Ok(Signature { text, defs, refs })
241 hir::TyKind::Path(hir::QPath::Resolved(None, ref path)) => path.make(offset, id, scx),
242 hir::TyKind::Path(hir::QPath::Resolved(Some(ref qself), ref path)) => {
243 let nested_ty = qself.make(offset + 1, id, scx)?;
244 let prefix = format!(
247 path_segment_to_string(&path.segments[0])
250 let name = path_segment_to_string(path.segments.last().ok_or("Bad path")?);
251 let res = scx.get_path_res(id.ok_or("Missing id for Path")?);
252 let id = id_from_def_id(res.def_id());
253 if path.segments.len() == 2 {
254 let start = offset + prefix.len();
255 let end = start + name.len();
258 text: prefix + &name,
260 refs: vec![SigElement { id, start, end }],
263 let start = offset + prefix.len() + 5;
264 let end = start + name.len();
265 // FIXME should put the proper path in there, not elipses.
267 text: prefix + "...::" + &name,
269 refs: vec![SigElement { id, start, end }],
273 hir::TyKind::Path(hir::QPath::TypeRelative(ty, segment)) => {
274 let nested_ty = ty.make(offset + 1, id, scx)?;
275 let prefix = format!("<{}>::", nested_ty.text,);
277 let name = path_segment_to_string(segment);
278 let res = scx.get_path_res(id.ok_or("Missing id for Path")?);
279 let id = id_from_def_id(res.def_id());
281 let start = offset + prefix.len();
282 let end = start + name.len();
284 text: prefix + &name,
286 refs: vec![SigElement { id, start, end }],
289 hir::TyKind::Path(hir::QPath::LangItem(..)) => unimplemented!(),
290 hir::TyKind::TraitObject(bounds, ..) => {
291 // FIXME recurse into bounds
292 let bounds: Vec<hir::GenericBound<'_>> = bounds
294 .map(|hir::PolyTraitRef { bound_generic_params, trait_ref, span }| {
295 hir::GenericBound::Trait(
297 bound_generic_params,
298 trait_ref: hir::TraitRef {
299 path: trait_ref.path,
300 hir_ref_id: trait_ref.hir_ref_id,
304 hir::TraitBoundModifier::None,
308 let nested = bounds_to_string(&bounds);
311 hir::TyKind::Array(ref ty, ref anon_const) => {
312 let nested_ty = ty.make(offset + 1, id, scx)?;
313 let expr = id_to_string(&scx.tcx.hir(), anon_const.body.hir_id).replace('\n', " ");
314 let text = format!("[{}; {}]", nested_ty.text, expr);
315 Ok(replace_text(nested_ty, text))
317 hir::TyKind::OpaqueDef(item_id, _) => {
318 let item = scx.tcx.hir().item(item_id.id);
319 item.make(offset, Some(item_id.id), scx)
321 hir::TyKind::Typeof(_) | hir::TyKind::Infer | hir::TyKind::Err => Err("Ty"),
326 impl<'hir> Sig for hir::Item<'hir> {
327 fn make(&self, offset: usize, _parent_id: Option<hir::HirId>, scx: &SaveContext<'_>) -> Result {
328 let id = Some(self.hir_id);
331 hir::ItemKind::Static(ref ty, m, ref body) => {
332 let mut text = "static ".to_owned();
333 if m == hir::Mutability::Mut {
334 text.push_str("mut ");
336 let name = self.ident.to_string();
337 let defs = vec![SigElement {
338 id: id_from_hir_id(self.hir_id, scx),
339 start: offset + text.len(),
340 end: offset + text.len() + name.len(),
342 text.push_str(&name);
345 let ty = ty.make(offset + text.len(), id, scx)?;
346 text.push_str(&ty.text);
348 text.push_str(" = ");
349 let expr = id_to_string(&scx.tcx.hir(), body.hir_id).replace('\n', " ");
350 text.push_str(&expr);
354 Ok(extend_sig(ty, text, defs, vec![]))
356 hir::ItemKind::Const(ref ty, ref body) => {
357 let mut text = "const ".to_owned();
358 let name = self.ident.to_string();
359 let defs = vec![SigElement {
360 id: id_from_hir_id(self.hir_id, scx),
361 start: offset + text.len(),
362 end: offset + text.len() + name.len(),
364 text.push_str(&name);
367 let ty = ty.make(offset + text.len(), id, scx)?;
368 text.push_str(&ty.text);
370 text.push_str(" = ");
371 let expr = id_to_string(&scx.tcx.hir(), body.hir_id).replace('\n', " ");
372 text.push_str(&expr);
376 Ok(extend_sig(ty, text, defs, vec![]))
378 hir::ItemKind::Fn(hir::FnSig { ref decl, header }, ref generics, _) => {
379 let mut text = String::new();
380 if let hir::Constness::Const = header.constness {
381 text.push_str("const ");
383 if hir::IsAsync::Async == header.asyncness {
384 text.push_str("async ");
386 if let hir::Unsafety::Unsafe = header.unsafety {
387 text.push_str("unsafe ");
389 text.push_str("fn ");
392 name_and_generics(text, offset, generics, self.hir_id, self.ident, scx)?;
395 for i in decl.inputs {
396 // FIXME should descend into patterns to add defs.
397 sig.text.push_str(": ");
398 let nested = i.make(offset + sig.text.len(), Some(i.hir_id), scx)?;
399 sig.text.push_str(&nested.text);
401 sig.defs.extend(nested.defs.into_iter());
402 sig.refs.extend(nested.refs.into_iter());
406 if let hir::FnRetTy::Return(ref t) = decl.output {
407 sig.text.push_str(" -> ");
408 let nested = t.make(offset + sig.text.len(), None, scx)?;
409 sig.text.push_str(&nested.text);
410 sig.defs.extend(nested.defs.into_iter());
411 sig.refs.extend(nested.refs.into_iter());
413 sig.text.push_str(" {}");
417 hir::ItemKind::Mod(ref _mod) => {
418 let mut text = "mod ".to_owned();
419 let name = self.ident.to_string();
420 let defs = vec![SigElement {
421 id: id_from_hir_id(self.hir_id, scx),
422 start: offset + text.len(),
423 end: offset + text.len() + name.len(),
425 text.push_str(&name);
426 // Could be either `mod foo;` or `mod foo { ... }`, but we'll just pick one.
429 Ok(Signature { text, defs, refs: vec![] })
431 hir::ItemKind::TyAlias(ref ty, ref generics) => {
432 let text = "type ".to_owned();
434 name_and_generics(text, offset, generics, self.hir_id, self.ident, scx)?;
436 sig.text.push_str(" = ");
437 let ty = ty.make(offset + sig.text.len(), id, scx)?;
438 sig.text.push_str(&ty.text);
441 Ok(merge_sigs(sig.text.clone(), vec![sig, ty]))
443 hir::ItemKind::Enum(_, ref generics) => {
444 let text = "enum ".to_owned();
446 name_and_generics(text, offset, generics, self.hir_id, self.ident, scx)?;
447 sig.text.push_str(" {}");
450 hir::ItemKind::Struct(_, ref generics) => {
451 let text = "struct ".to_owned();
453 name_and_generics(text, offset, generics, self.hir_id, self.ident, scx)?;
454 sig.text.push_str(" {}");
457 hir::ItemKind::Union(_, ref generics) => {
458 let text = "union ".to_owned();
460 name_and_generics(text, offset, generics, self.hir_id, self.ident, scx)?;
461 sig.text.push_str(" {}");
464 hir::ItemKind::Trait(is_auto, unsafety, ref generics, bounds, _) => {
465 let mut text = String::new();
467 if is_auto == hir::IsAuto::Yes {
468 text.push_str("auto ");
471 if let hir::Unsafety::Unsafe = unsafety {
472 text.push_str("unsafe ");
474 text.push_str("trait ");
476 name_and_generics(text, offset, generics, self.hir_id, self.ident, scx)?;
478 if !bounds.is_empty() {
479 sig.text.push_str(": ");
480 sig.text.push_str(&bounds_to_string(bounds));
482 // FIXME where clause
483 sig.text.push_str(" {}");
487 hir::ItemKind::TraitAlias(ref generics, bounds) => {
488 let mut text = String::new();
489 text.push_str("trait ");
491 name_and_generics(text, offset, generics, self.hir_id, self.ident, scx)?;
493 if !bounds.is_empty() {
494 sig.text.push_str(" = ");
495 sig.text.push_str(&bounds_to_string(bounds));
497 // FIXME where clause
498 sig.text.push_str(";");
502 hir::ItemKind::Impl {
513 let mut text = String::new();
514 if let hir::Defaultness::Default { .. } = defaultness {
515 text.push_str("default ");
517 if let hir::Unsafety::Unsafe = unsafety {
518 text.push_str("unsafe ");
520 text.push_str("impl");
521 if let hir::Constness::Const = constness {
522 text.push_str(" const");
525 let generics_sig = generics.make(offset + text.len(), id, scx)?;
526 text.push_str(&generics_sig.text);
530 let trait_sig = if let Some(ref t) = *of_trait {
531 if let hir::ImplPolarity::Negative(_) = polarity {
534 let trait_sig = t.path.make(offset + text.len(), id, scx)?;
535 text.push_str(&trait_sig.text);
536 text.push_str(" for ");
539 text_sig(String::new())
542 let ty_sig = self_ty.make(offset + text.len(), id, scx)?;
543 text.push_str(&ty_sig.text);
545 text.push_str(" {}");
547 Ok(merge_sigs(text, vec![generics_sig, trait_sig, ty_sig]))
549 // FIXME where clause
551 hir::ItemKind::ForeignMod(_) => Err("extern mod"),
552 hir::ItemKind::GlobalAsm(_) => Err("glboal asm"),
553 hir::ItemKind::ExternCrate(_) => Err("extern crate"),
554 hir::ItemKind::OpaqueTy(..) => Err("opaque type"),
555 // FIXME should implement this (e.g., pub use).
556 hir::ItemKind::Use(..) => Err("import"),
561 impl<'hir> Sig for hir::Path<'hir> {
562 fn make(&self, offset: usize, id: Option<hir::HirId>, scx: &SaveContext<'_>) -> Result {
563 let res = scx.get_path_res(id.ok_or("Missing id for Path")?);
565 let (name, start, end) = match res {
566 Res::PrimTy(..) | Res::SelfTy(..) | Res::Err => {
567 return Ok(Signature { text: path_to_string(self), defs: vec![], refs: vec![] });
569 Res::Def(DefKind::AssocConst | DefKind::Variant | DefKind::Ctor(..), _) => {
570 let len = self.segments.len();
572 return Err("Bad path");
574 // FIXME: really we should descend into the generics here and add SigElements for
576 // FIXME: would be nice to have a def for the first path segment.
577 let seg1 = path_segment_to_string(&self.segments[len - 2]);
578 let seg2 = path_segment_to_string(&self.segments[len - 1]);
579 let start = offset + seg1.len() + 2;
580 (format!("{}::{}", seg1, seg2), start, start + seg2.len())
583 let name = path_segment_to_string(self.segments.last().ok_or("Bad path")?);
584 let end = offset + name.len();
589 let id = id_from_def_id(res.def_id());
590 Ok(Signature { text: name, defs: vec![], refs: vec![SigElement { id, start, end }] })
594 // This does not cover the where clause, which must be processed separately.
595 impl<'hir> Sig for hir::Generics<'hir> {
596 fn make(&self, offset: usize, _parent_id: Option<hir::HirId>, scx: &SaveContext<'_>) -> Result {
597 if self.params.is_empty() {
598 return Ok(text_sig(String::new()));
601 let mut text = "<".to_owned();
603 let mut defs = Vec::with_capacity(self.params.len());
604 for param in self.params {
605 let mut param_text = String::new();
606 if let hir::GenericParamKind::Const { .. } = param.kind {
607 param_text.push_str("const ");
609 param_text.push_str(¶m.name.ident().as_str());
610 defs.push(SigElement {
611 id: id_from_hir_id(param.hir_id, scx),
612 start: offset + text.len(),
613 end: offset + text.len() + param_text.as_str().len(),
615 if let hir::GenericParamKind::Const { ref ty } = param.kind {
616 param_text.push_str(": ");
617 param_text.push_str(&ty_to_string(&ty));
619 if !param.bounds.is_empty() {
620 param_text.push_str(": ");
622 hir::GenericParamKind::Lifetime { .. } => {
626 .map(|bound| match bound {
627 hir::GenericBound::Outlives(lt) => lt.name.ident().to_string(),
632 param_text.push_str(&bounds);
633 // FIXME add lifetime bounds refs.
635 hir::GenericParamKind::Type { .. } => {
636 param_text.push_str(&bounds_to_string(param.bounds));
637 // FIXME descend properly into bounds.
639 hir::GenericParamKind::Const { .. } => {
640 // Const generics cannot contain bounds.
644 text.push_str(¶m_text);
649 Ok(Signature { text, defs, refs: vec![] })
653 impl<'hir> Sig for hir::StructField<'hir> {
654 fn make(&self, offset: usize, _parent_id: Option<hir::HirId>, scx: &SaveContext<'_>) -> Result {
655 let mut text = String::new();
657 text.push_str(&self.ident.to_string());
658 let defs = Some(SigElement {
659 id: id_from_hir_id(self.hir_id, scx),
661 end: offset + text.len(),
665 let mut ty_sig = self.ty.make(offset + text.len(), Some(self.hir_id), scx)?;
666 text.push_str(&ty_sig.text);
668 ty_sig.defs.extend(defs.into_iter());
673 impl<'hir> Sig for hir::Variant<'hir> {
674 fn make(&self, offset: usize, parent_id: Option<hir::HirId>, scx: &SaveContext<'_>) -> Result {
675 let mut text = self.ident.to_string();
677 hir::VariantData::Struct(fields, r) => {
678 let id = parent_id.unwrap();
679 let name_def = SigElement {
680 id: id_from_hir_id(id, scx),
682 end: offset + text.len(),
684 text.push_str(" { ");
685 let mut defs = vec![name_def];
686 let mut refs = vec![];
688 text.push_str("/* parse error */ ");
691 let field_sig = f.make(offset + text.len(), Some(id), scx)?;
692 text.push_str(&field_sig.text);
694 defs.extend(field_sig.defs.into_iter());
695 refs.extend(field_sig.refs.into_iter());
699 Ok(Signature { text, defs, refs })
701 hir::VariantData::Tuple(fields, id) => {
702 let name_def = SigElement {
703 id: id_from_hir_id(id, scx),
705 end: offset + text.len(),
708 let mut defs = vec![name_def];
709 let mut refs = vec![];
711 let field_sig = f.make(offset + text.len(), Some(id), scx)?;
712 text.push_str(&field_sig.text);
714 defs.extend(field_sig.defs.into_iter());
715 refs.extend(field_sig.refs.into_iter());
718 Ok(Signature { text, defs, refs })
720 hir::VariantData::Unit(id) => {
721 let name_def = SigElement {
722 id: id_from_hir_id(id, scx),
724 end: offset + text.len(),
726 Ok(Signature { text, defs: vec![name_def], refs: vec![] })
732 impl<'hir> Sig for hir::ForeignItem<'hir> {
733 fn make(&self, offset: usize, _parent_id: Option<hir::HirId>, scx: &SaveContext<'_>) -> Result {
734 let id = Some(self.hir_id);
736 hir::ForeignItemKind::Fn(decl, _, ref generics) => {
737 let mut text = String::new();
738 text.push_str("fn ");
741 name_and_generics(text, offset, generics, self.hir_id, self.ident, scx)?;
744 for i in decl.inputs {
745 sig.text.push_str(": ");
746 let nested = i.make(offset + sig.text.len(), Some(i.hir_id), scx)?;
747 sig.text.push_str(&nested.text);
749 sig.defs.extend(nested.defs.into_iter());
750 sig.refs.extend(nested.refs.into_iter());
754 if let hir::FnRetTy::Return(ref t) = decl.output {
755 sig.text.push_str(" -> ");
756 let nested = t.make(offset + sig.text.len(), None, scx)?;
757 sig.text.push_str(&nested.text);
758 sig.defs.extend(nested.defs.into_iter());
759 sig.refs.extend(nested.refs.into_iter());
765 hir::ForeignItemKind::Static(ref ty, m) => {
766 let mut text = "static ".to_owned();
767 if m == Mutability::Mut {
768 text.push_str("mut ");
770 let name = self.ident.to_string();
771 let defs = vec![SigElement {
772 id: id_from_hir_id(self.hir_id, scx),
773 start: offset + text.len(),
774 end: offset + text.len() + name.len(),
776 text.push_str(&name);
779 let ty_sig = ty.make(offset + text.len(), id, scx)?;
782 Ok(extend_sig(ty_sig, text, defs, vec![]))
784 hir::ForeignItemKind::Type => {
785 let mut text = "type ".to_owned();
786 let name = self.ident.to_string();
787 let defs = vec![SigElement {
788 id: id_from_hir_id(self.hir_id, scx),
789 start: offset + text.len(),
790 end: offset + text.len() + name.len(),
792 text.push_str(&name);
795 Ok(Signature { text, defs, refs: vec![] })
801 fn name_and_generics(
804 generics: &hir::Generics<'_>,
807 scx: &SaveContext<'_>,
809 let name = name.to_string();
810 let def = SigElement {
811 id: id_from_hir_id(id, scx),
812 start: offset + text.len(),
813 end: offset + text.len() + name.len(),
815 text.push_str(&name);
816 let generics: Signature = generics.make(offset + text.len(), Some(id), scx)?;
817 // FIXME where clause
818 let text = format!("{}{}", text, generics.text);
819 Ok(extend_sig(generics, text, vec![def], vec![]))
822 fn make_assoc_type_signature(
825 bounds: Option<hir::GenericBounds<'_>>,
826 default: Option<&hir::Ty<'_>>,
827 scx: &SaveContext<'_>,
829 let mut text = "type ".to_owned();
830 let name = ident.to_string();
831 let mut defs = vec![SigElement {
832 id: id_from_hir_id(id, scx),
834 end: text.len() + name.len(),
836 let mut refs = vec![];
837 text.push_str(&name);
838 if let Some(bounds) = bounds {
840 // FIXME should descend into bounds
841 text.push_str(&bounds_to_string(bounds));
843 if let Some(default) = default {
844 text.push_str(" = ");
845 let ty_sig = default.make(text.len(), Some(id), scx)?;
846 text.push_str(&ty_sig.text);
847 defs.extend(ty_sig.defs.into_iter());
848 refs.extend(ty_sig.refs.into_iter());
851 Ok(Signature { text, defs, refs })
854 fn make_assoc_const_signature(
858 default: Option<&hir::Expr<'_>>,
859 scx: &SaveContext<'_>,
861 let mut text = "const ".to_owned();
862 let name = ident.to_string();
863 let mut defs = vec![SigElement {
864 id: id_from_hir_id(id, scx),
866 end: text.len() + name.len(),
868 let mut refs = vec![];
869 text.push_str(&name);
872 let ty_sig = ty.make(text.len(), Some(id), scx)?;
873 text.push_str(&ty_sig.text);
874 defs.extend(ty_sig.defs.into_iter());
875 refs.extend(ty_sig.refs.into_iter());
877 if let Some(default) = default {
878 text.push_str(" = ");
879 text.push_str(&id_to_string(&scx.tcx.hir(), default.hir_id));
882 Ok(Signature { text, defs, refs })
885 fn make_method_signature(
888 generics: &hir::Generics<'_>,
890 scx: &SaveContext<'_>,
892 // FIXME code dup with function signature
893 let mut text = String::new();
894 if let hir::Constness::Const = m.header.constness {
895 text.push_str("const ");
897 if hir::IsAsync::Async == m.header.asyncness {
898 text.push_str("async ");
900 if let hir::Unsafety::Unsafe = m.header.unsafety {
901 text.push_str("unsafe ");
903 text.push_str("fn ");
905 let mut sig = name_and_generics(text, 0, generics, id, ident, scx)?;
908 for i in m.decl.inputs {
909 sig.text.push_str(": ");
910 let nested = i.make(sig.text.len(), Some(i.hir_id), scx)?;
911 sig.text.push_str(&nested.text);
913 sig.defs.extend(nested.defs.into_iter());
914 sig.refs.extend(nested.refs.into_iter());
918 if let hir::FnRetTy::Return(ref t) = m.decl.output {
919 sig.text.push_str(" -> ");
920 let nested = t.make(sig.text.len(), None, scx)?;
921 sig.text.push_str(&nested.text);
922 sig.defs.extend(nested.defs.into_iter());
923 sig.refs.extend(nested.refs.into_iter());
925 sig.text.push_str(" {}");