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_node_id, SaveContext};
30 use rls_data::{SigElement, Signature};
32 use rustc_ast_pretty::pprust;
33 use rustc_hir::def::{DefKind, Res};
34 use syntax::ast::{self, Extern, NodeId};
36 pub fn item_signature(item: &ast::Item, scx: &SaveContext<'_, '_>) -> Option<Signature> {
37 if !scx.config.signatures {
40 item.make(0, None, scx).ok()
43 pub fn foreign_item_signature(
44 item: &ast::ForeignItem,
45 scx: &SaveContext<'_, '_>,
46 ) -> Option<Signature> {
47 if !scx.config.signatures {
50 item.make(0, None, scx).ok()
53 /// Signature for a struct or tuple field declaration.
54 /// Does not include a trailing comma.
55 pub fn field_signature(field: &ast::StructField, scx: &SaveContext<'_, '_>) -> Option<Signature> {
56 if !scx.config.signatures {
59 field.make(0, None, scx).ok()
62 /// Does not include a trailing comma.
63 pub fn variant_signature(variant: &ast::Variant, scx: &SaveContext<'_, '_>) -> Option<Signature> {
64 if !scx.config.signatures {
67 variant.make(0, None, scx).ok()
70 pub fn method_signature(
73 generics: &ast::Generics,
75 scx: &SaveContext<'_, '_>,
76 ) -> Option<Signature> {
77 if !scx.config.signatures {
80 make_method_signature(id, ident, generics, m, scx).ok()
83 pub fn assoc_const_signature(
87 default: Option<&ast::Expr>,
88 scx: &SaveContext<'_, '_>,
89 ) -> Option<Signature> {
90 if !scx.config.signatures {
93 make_assoc_const_signature(id, ident, ty, default, scx).ok()
96 pub fn assoc_type_signature(
99 bounds: Option<&ast::GenericBounds>,
100 default: Option<&ast::Ty>,
101 scx: &SaveContext<'_, '_>,
102 ) -> Option<Signature> {
103 if !scx.config.signatures {
106 make_assoc_type_signature(id, ident, bounds, default, scx).ok()
109 type Result = std::result::Result<Signature, &'static str>;
112 fn make(&self, offset: usize, id: Option<NodeId>, scx: &SaveContext<'_, '_>) -> Result;
118 defs: Vec<SigElement>,
119 refs: Vec<SigElement>,
122 sig.defs.extend(defs.into_iter());
123 sig.refs.extend(refs.into_iter());
127 fn replace_text(mut sig: Signature, text: String) -> Signature {
132 fn merge_sigs(text: String, sigs: Vec<Signature>) -> Signature {
133 let mut result = Signature { text, defs: vec![], refs: vec![] };
135 let (defs, refs): (Vec<_>, Vec<_>) = sigs.into_iter().map(|s| (s.defs, s.refs)).unzip();
137 result.defs.extend(defs.into_iter().flat_map(|ds| ds.into_iter()));
138 result.refs.extend(refs.into_iter().flat_map(|rs| rs.into_iter()));
143 fn text_sig(text: String) -> Signature {
144 Signature { text, defs: vec![], refs: vec![] }
147 fn push_extern(text: &mut String, ext: Extern) {
150 Extern::Implicit => text.push_str("extern "),
151 Extern::Explicit(abi) => text.push_str(&format!("extern \"{}\" ", abi.symbol)),
155 impl Sig for ast::Ty {
156 fn make(&self, offset: usize, _parent_id: Option<NodeId>, scx: &SaveContext<'_, '_>) -> Result {
157 let id = Some(self.id);
159 ast::TyKind::Slice(ref ty) => {
160 let nested = ty.make(offset + 1, id, scx)?;
161 let text = format!("[{}]", nested.text);
162 Ok(replace_text(nested, text))
164 ast::TyKind::Ptr(ref mt) => {
165 let prefix = match mt.mutbl {
166 ast::Mutability::Mut => "*mut ",
167 ast::Mutability::Not => "*const ",
169 let nested = mt.ty.make(offset + prefix.len(), id, scx)?;
170 let text = format!("{}{}", prefix, nested.text);
171 Ok(replace_text(nested, text))
173 ast::TyKind::Rptr(ref lifetime, ref mt) => {
174 let mut prefix = "&".to_owned();
175 if let &Some(ref l) = lifetime {
176 prefix.push_str(&l.ident.to_string());
179 if let ast::Mutability::Mut = mt.mutbl {
180 prefix.push_str("mut ");
183 let nested = mt.ty.make(offset + prefix.len(), id, scx)?;
184 let text = format!("{}{}", prefix, nested.text);
185 Ok(replace_text(nested, text))
187 ast::TyKind::Never => Ok(text_sig("!".to_owned())),
188 ast::TyKind::CVarArgs => Ok(text_sig("...".to_owned())),
189 ast::TyKind::Tup(ref ts) => {
190 let mut text = "(".to_owned();
191 let mut defs = vec![];
192 let mut refs = vec![];
194 let nested = t.make(offset + text.len(), id, scx)?;
195 text.push_str(&nested.text);
197 defs.extend(nested.defs.into_iter());
198 refs.extend(nested.refs.into_iter());
201 Ok(Signature { text, defs, refs })
203 ast::TyKind::Paren(ref ty) => {
204 let nested = ty.make(offset + 1, id, scx)?;
205 let text = format!("({})", nested.text);
206 Ok(replace_text(nested, text))
208 ast::TyKind::BareFn(ref f) => {
209 let mut text = String::new();
210 if !f.generic_params.is_empty() {
211 // FIXME defs, bounds on lifetimes
212 text.push_str("for<");
216 .filter_map(|param| match param.kind {
217 ast::GenericParamKind::Lifetime { .. } => {
218 Some(param.ident.to_string())
228 if let ast::Unsafe::Yes(_) = f.unsafety {
229 text.push_str("unsafe ");
231 push_extern(&mut text, f.ext);
232 text.push_str("fn(");
234 let mut defs = vec![];
235 let mut refs = vec![];
236 for i in &f.decl.inputs {
237 let nested = i.ty.make(offset + text.len(), Some(i.id), scx)?;
238 text.push_str(&nested.text);
240 defs.extend(nested.defs.into_iter());
241 refs.extend(nested.refs.into_iter());
244 if let ast::FunctionRetTy::Ty(ref t) = f.decl.output {
245 text.push_str(" -> ");
246 let nested = t.make(offset + text.len(), None, scx)?;
247 text.push_str(&nested.text);
249 defs.extend(nested.defs.into_iter());
250 refs.extend(nested.refs.into_iter());
253 Ok(Signature { text, defs, refs })
255 ast::TyKind::Path(None, ref path) => path.make(offset, id, scx),
256 ast::TyKind::Path(Some(ref qself), ref path) => {
257 let nested_ty = qself.ty.make(offset + 1, id, scx)?;
258 let prefix = if qself.position == 0 {
259 format!("<{}>::", nested_ty.text)
260 } else if qself.position == 1 {
261 let first = pprust::path_segment_to_string(&path.segments[0]);
262 format!("<{} as {}>::", nested_ty.text, first)
264 // FIXME handle path instead of elipses.
265 format!("<{} as ...>::", nested_ty.text)
268 let name = pprust::path_segment_to_string(path.segments.last().ok_or("Bad path")?);
269 let res = scx.get_path_res(id.ok_or("Missing id for Path")?);
270 let id = id_from_def_id(res.def_id());
271 if path.segments.len() - qself.position == 1 {
272 let start = offset + prefix.len();
273 let end = start + name.len();
276 text: prefix + &name,
278 refs: vec![SigElement { id, start, end }],
281 let start = offset + prefix.len() + 5;
282 let end = start + name.len();
283 // FIXME should put the proper path in there, not elipses.
285 text: prefix + "...::" + &name,
287 refs: vec![SigElement { id, start, end }],
291 ast::TyKind::TraitObject(ref bounds, ..) => {
292 // FIXME recurse into bounds
293 let nested = pprust::bounds_to_string(bounds);
296 ast::TyKind::ImplTrait(_, ref bounds) => {
297 // FIXME recurse into bounds
298 let nested = pprust::bounds_to_string(bounds);
299 Ok(text_sig(format!("impl {}", nested)))
301 ast::TyKind::Array(ref ty, ref v) => {
302 let nested_ty = ty.make(offset + 1, id, scx)?;
303 let expr = pprust::expr_to_string(&v.value).replace('\n', " ");
304 let text = format!("[{}; {}]", nested_ty.text, expr);
305 Ok(replace_text(nested_ty, text))
307 ast::TyKind::Typeof(_)
310 | ast::TyKind::ImplicitSelf
311 | ast::TyKind::Mac(_) => Err("Ty"),
316 impl Sig for ast::Item {
317 fn make(&self, offset: usize, _parent_id: Option<NodeId>, scx: &SaveContext<'_, '_>) -> Result {
318 let id = Some(self.id);
321 ast::ItemKind::Static(ref ty, m, ref expr) => {
322 let mut text = "static ".to_owned();
323 if m == ast::Mutability::Mut {
324 text.push_str("mut ");
326 let name = self.ident.to_string();
327 let defs = vec![SigElement {
328 id: id_from_node_id(self.id, scx),
329 start: offset + text.len(),
330 end: offset + text.len() + name.len(),
332 text.push_str(&name);
335 let ty = ty.make(offset + text.len(), id, scx)?;
336 text.push_str(&ty.text);
338 if let Some(expr) = expr {
339 text.push_str(" = ");
340 let expr = pprust::expr_to_string(expr).replace('\n', " ");
341 text.push_str(&expr);
346 Ok(extend_sig(ty, text, defs, vec![]))
348 ast::ItemKind::Const(ref ty, ref expr) => {
349 let mut text = "const ".to_owned();
350 let name = self.ident.to_string();
351 let defs = vec![SigElement {
352 id: id_from_node_id(self.id, scx),
353 start: offset + text.len(),
354 end: offset + text.len() + name.len(),
356 text.push_str(&name);
359 let ty = ty.make(offset + text.len(), id, scx)?;
360 text.push_str(&ty.text);
362 if let Some(expr) = expr {
363 text.push_str(" = ");
364 let expr = pprust::expr_to_string(expr).replace('\n', " ");
365 text.push_str(&expr);
370 Ok(extend_sig(ty, text, defs, vec![]))
372 ast::ItemKind::Fn(ast::FnSig { ref decl, header }, ref generics, _) => {
373 let mut text = String::new();
374 if let ast::Const::Yes(_) = header.constness {
375 text.push_str("const ");
377 if header.asyncness.is_async() {
378 text.push_str("async ");
380 if let ast::Unsafe::Yes(_) = header.unsafety {
381 text.push_str("unsafe ");
383 push_extern(&mut text, header.ext);
384 text.push_str("fn ");
386 let mut sig = name_and_generics(text, offset, generics, self.id, self.ident, scx)?;
389 for i in &decl.inputs {
390 // FIXME should descend into patterns to add defs.
391 sig.text.push_str(&pprust::pat_to_string(&i.pat));
392 sig.text.push_str(": ");
393 let nested = i.ty.make(offset + sig.text.len(), Some(i.id), scx)?;
394 sig.text.push_str(&nested.text);
396 sig.defs.extend(nested.defs.into_iter());
397 sig.refs.extend(nested.refs.into_iter());
401 if let ast::FunctionRetTy::Ty(ref t) = decl.output {
402 sig.text.push_str(" -> ");
403 let nested = t.make(offset + sig.text.len(), None, scx)?;
404 sig.text.push_str(&nested.text);
405 sig.defs.extend(nested.defs.into_iter());
406 sig.refs.extend(nested.refs.into_iter());
408 sig.text.push_str(" {}");
412 ast::ItemKind::Mod(ref _mod) => {
413 let mut text = "mod ".to_owned();
414 let name = self.ident.to_string();
415 let defs = vec![SigElement {
416 id: id_from_node_id(self.id, scx),
417 start: offset + text.len(),
418 end: offset + text.len() + name.len(),
420 text.push_str(&name);
421 // Could be either `mod foo;` or `mod foo { ... }`, but we'll just pick one.
424 Ok(Signature { text, defs, refs: vec![] })
426 ast::ItemKind::TyAlias(ref ty, ref generics) => {
427 let text = "type ".to_owned();
428 let mut sig = name_and_generics(text, offset, generics, self.id, self.ident, scx)?;
430 sig.text.push_str(" = ");
431 let ty = ty.make(offset + sig.text.len(), id, scx)?;
432 sig.text.push_str(&ty.text);
435 Ok(merge_sigs(sig.text.clone(), vec![sig, ty]))
437 ast::ItemKind::Enum(_, ref generics) => {
438 let text = "enum ".to_owned();
439 let mut sig = name_and_generics(text, offset, generics, self.id, self.ident, scx)?;
440 sig.text.push_str(" {}");
443 ast::ItemKind::Struct(_, ref generics) => {
444 let text = "struct ".to_owned();
445 let mut sig = name_and_generics(text, offset, generics, self.id, self.ident, scx)?;
446 sig.text.push_str(" {}");
449 ast::ItemKind::Union(_, ref generics) => {
450 let text = "union ".to_owned();
451 let mut sig = name_and_generics(text, offset, generics, self.id, self.ident, scx)?;
452 sig.text.push_str(" {}");
455 ast::ItemKind::Trait(is_auto, unsafety, ref generics, ref bounds, _) => {
456 let mut text = String::new();
458 if is_auto == ast::IsAuto::Yes {
459 text.push_str("auto ");
462 if let ast::Unsafe::Yes(_) = unsafety {
463 text.push_str("unsafe ");
465 text.push_str("trait ");
466 let mut sig = name_and_generics(text, offset, generics, self.id, self.ident, scx)?;
468 if !bounds.is_empty() {
469 sig.text.push_str(": ");
470 sig.text.push_str(&pprust::bounds_to_string(bounds));
472 // FIXME where clause
473 sig.text.push_str(" {}");
477 ast::ItemKind::TraitAlias(ref generics, ref bounds) => {
478 let mut text = String::new();
479 text.push_str("trait ");
480 let mut sig = name_and_generics(text, offset, generics, self.id, self.ident, scx)?;
482 if !bounds.is_empty() {
483 sig.text.push_str(" = ");
484 sig.text.push_str(&pprust::bounds_to_string(bounds));
486 // FIXME where clause
487 sig.text.push_str(";");
491 ast::ItemKind::Impl {
501 let mut text = String::new();
502 if let ast::Defaultness::Default = defaultness {
503 text.push_str("default ");
505 if let ast::Unsafe::Yes(_) = unsafety {
506 text.push_str("unsafe ");
508 text.push_str("impl");
509 if let ast::Const::Yes(_) = constness {
510 text.push_str(" const");
513 let generics_sig = generics.make(offset + text.len(), id, scx)?;
514 text.push_str(&generics_sig.text);
518 let trait_sig = if let Some(ref t) = *of_trait {
519 if polarity == ast::ImplPolarity::Negative {
522 let trait_sig = t.path.make(offset + text.len(), id, scx)?;
523 text.push_str(&trait_sig.text);
524 text.push_str(" for ");
527 text_sig(String::new())
530 let ty_sig = self_ty.make(offset + text.len(), id, scx)?;
531 text.push_str(&ty_sig.text);
533 text.push_str(" {}");
535 Ok(merge_sigs(text, vec![generics_sig, trait_sig, ty_sig]))
537 // FIXME where clause
539 ast::ItemKind::ForeignMod(_) => Err("extern mod"),
540 ast::ItemKind::GlobalAsm(_) => Err("glboal asm"),
541 ast::ItemKind::ExternCrate(_) => Err("extern crate"),
542 // FIXME should implement this (e.g., pub use).
543 ast::ItemKind::Use(_) => Err("import"),
544 ast::ItemKind::Mac(..) | ast::ItemKind::MacroDef(_) => Err("Macro"),
549 impl Sig for ast::Path {
550 fn make(&self, offset: usize, id: Option<NodeId>, scx: &SaveContext<'_, '_>) -> Result {
551 let res = scx.get_path_res(id.ok_or("Missing id for Path")?);
553 let (name, start, end) = match res {
554 Res::PrimTy(..) | Res::SelfTy(..) | Res::Err => {
555 return Ok(Signature {
556 text: pprust::path_to_string(self),
561 Res::Def(DefKind::AssocConst, _)
562 | Res::Def(DefKind::Variant, _)
563 | Res::Def(DefKind::Ctor(..), _) => {
564 let len = self.segments.len();
566 return Err("Bad path");
568 // FIXME: really we should descend into the generics here and add SigElements for
570 // FIXME: would be nice to have a def for the first path segment.
571 let seg1 = pprust::path_segment_to_string(&self.segments[len - 2]);
572 let seg2 = pprust::path_segment_to_string(&self.segments[len - 1]);
573 let start = offset + seg1.len() + 2;
574 (format!("{}::{}", seg1, seg2), start, start + seg2.len())
577 let name = pprust::path_segment_to_string(self.segments.last().ok_or("Bad path")?);
578 let end = offset + name.len();
583 let id = id_from_def_id(res.def_id());
584 Ok(Signature { text: name, defs: vec![], refs: vec![SigElement { id, start, end }] })
588 // This does not cover the where clause, which must be processed separately.
589 impl Sig for ast::Generics {
590 fn make(&self, offset: usize, _parent_id: Option<NodeId>, scx: &SaveContext<'_, '_>) -> Result {
591 if self.params.is_empty() {
592 return Ok(text_sig(String::new()));
595 let mut text = "<".to_owned();
597 let mut defs = Vec::with_capacity(self.params.len());
598 for param in &self.params {
599 let mut param_text = String::new();
600 if let ast::GenericParamKind::Const { .. } = param.kind {
601 param_text.push_str("const ");
603 param_text.push_str(¶m.ident.as_str());
604 defs.push(SigElement {
605 id: id_from_node_id(param.id, scx),
606 start: offset + text.len(),
607 end: offset + text.len() + param_text.as_str().len(),
609 if let ast::GenericParamKind::Const { ref ty } = param.kind {
610 param_text.push_str(": ");
611 param_text.push_str(&pprust::ty_to_string(&ty));
613 if !param.bounds.is_empty() {
614 param_text.push_str(": ");
616 ast::GenericParamKind::Lifetime { .. } => {
620 .map(|bound| match bound {
621 ast::GenericBound::Outlives(lt) => lt.ident.to_string(),
626 param_text.push_str(&bounds);
627 // FIXME add lifetime bounds refs.
629 ast::GenericParamKind::Type { .. } => {
630 param_text.push_str(&pprust::bounds_to_string(¶m.bounds));
631 // FIXME descend properly into bounds.
633 ast::GenericParamKind::Const { .. } => {
634 // Const generics cannot contain bounds.
638 text.push_str(¶m_text);
643 Ok(Signature { text, defs, refs: vec![] })
647 impl Sig for ast::StructField {
648 fn make(&self, offset: usize, _parent_id: Option<NodeId>, scx: &SaveContext<'_, '_>) -> Result {
649 let mut text = String::new();
651 if let Some(ident) = self.ident {
652 text.push_str(&ident.to_string());
653 defs = Some(SigElement {
654 id: id_from_node_id(self.id, scx),
656 end: offset + text.len(),
661 let mut ty_sig = self.ty.make(offset + text.len(), Some(self.id), scx)?;
662 text.push_str(&ty_sig.text);
664 ty_sig.defs.extend(defs.into_iter());
669 impl Sig for ast::Variant {
670 fn make(&self, offset: usize, parent_id: Option<NodeId>, scx: &SaveContext<'_, '_>) -> Result {
671 let mut text = self.ident.to_string();
673 ast::VariantData::Struct(ref fields, r) => {
674 let id = parent_id.unwrap();
675 let name_def = SigElement {
676 id: id_from_node_id(id, scx),
678 end: offset + text.len(),
680 text.push_str(" { ");
681 let mut defs = vec![name_def];
682 let mut refs = vec![];
684 text.push_str("/* parse error */ ");
687 let field_sig = f.make(offset + text.len(), Some(id), scx)?;
688 text.push_str(&field_sig.text);
690 defs.extend(field_sig.defs.into_iter());
691 refs.extend(field_sig.refs.into_iter());
695 Ok(Signature { text, defs, refs })
697 ast::VariantData::Tuple(ref fields, id) => {
698 let name_def = SigElement {
699 id: id_from_node_id(id, scx),
701 end: offset + text.len(),
704 let mut defs = vec![name_def];
705 let mut refs = vec![];
707 let field_sig = f.make(offset + text.len(), Some(id), scx)?;
708 text.push_str(&field_sig.text);
710 defs.extend(field_sig.defs.into_iter());
711 refs.extend(field_sig.refs.into_iter());
714 Ok(Signature { text, defs, refs })
716 ast::VariantData::Unit(id) => {
717 let name_def = SigElement {
718 id: id_from_node_id(id, scx),
720 end: offset + text.len(),
722 Ok(Signature { text, defs: vec![name_def], refs: vec![] })
728 impl Sig for ast::ForeignItem {
729 fn make(&self, offset: usize, _parent_id: Option<NodeId>, scx: &SaveContext<'_, '_>) -> Result {
730 let id = Some(self.id);
732 ast::ForeignItemKind::Fn(ref sig, ref generics, _) => {
733 let decl = &sig.decl;
734 let mut text = String::new();
735 text.push_str("fn ");
737 let mut sig = name_and_generics(text, offset, generics, self.id, self.ident, scx)?;
740 for i in &decl.inputs {
741 // FIXME should descend into patterns to add defs.
742 sig.text.push_str(&pprust::pat_to_string(&i.pat));
743 sig.text.push_str(": ");
744 let nested = i.ty.make(offset + sig.text.len(), Some(i.id), scx)?;
745 sig.text.push_str(&nested.text);
747 sig.defs.extend(nested.defs.into_iter());
748 sig.refs.extend(nested.refs.into_iter());
752 if let ast::FunctionRetTy::Ty(ref t) = decl.output {
753 sig.text.push_str(" -> ");
754 let nested = t.make(offset + sig.text.len(), None, scx)?;
755 sig.text.push_str(&nested.text);
756 sig.defs.extend(nested.defs.into_iter());
757 sig.refs.extend(nested.refs.into_iter());
763 ast::ForeignItemKind::Static(ref ty, m, _) => {
764 let mut text = "static ".to_owned();
765 if m == ast::Mutability::Mut {
766 text.push_str("mut ");
768 let name = self.ident.to_string();
769 let defs = vec![SigElement {
770 id: id_from_node_id(self.id, scx),
771 start: offset + text.len(),
772 end: offset + text.len() + name.len(),
774 text.push_str(&name);
777 let ty_sig = ty.make(offset + text.len(), id, scx)?;
780 Ok(extend_sig(ty_sig, text, defs, vec![]))
782 ast::ForeignItemKind::TyAlias(..) => {
783 let mut text = "type ".to_owned();
784 let name = self.ident.to_string();
785 let defs = vec![SigElement {
786 id: id_from_node_id(self.id, scx),
787 start: offset + text.len(),
788 end: offset + text.len() + name.len(),
790 text.push_str(&name);
793 Ok(Signature { text: text, defs: defs, refs: vec![] })
795 ast::ForeignItemKind::Const(..) => Err("foreign const"),
796 ast::ForeignItemKind::Macro(..) => Err("macro"),
801 fn name_and_generics(
804 generics: &ast::Generics,
807 scx: &SaveContext<'_, '_>,
809 let name = name.to_string();
810 let def = SigElement {
811 id: id_from_node_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<&ast::GenericBounds>,
826 default: Option<&ast::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_node_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(&pprust::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<&ast::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_node_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(&pprust::expr_to_string(default));
882 Ok(Signature { text, defs, refs })
885 fn make_method_signature(
888 generics: &ast::Generics,
890 scx: &SaveContext<'_, '_>,
892 // FIXME code dup with function signature
893 let mut text = String::new();
894 if let ast::Const::Yes(_) = m.header.constness {
895 text.push_str("const ");
897 if m.header.asyncness.is_async() {
898 text.push_str("async ");
900 if let ast::Unsafe::Yes(_) = m.header.unsafety {
901 text.push_str("unsafe ");
903 push_extern(&mut text, m.header.ext);
904 text.push_str("fn ");
906 let mut sig = name_and_generics(text, 0, generics, id, ident, scx)?;
909 for i in &m.decl.inputs {
910 // FIXME should descend into patterns to add defs.
911 sig.text.push_str(&pprust::pat_to_string(&i.pat));
912 sig.text.push_str(": ");
913 let nested = i.ty.make(sig.text.len(), Some(i.id), scx)?;
914 sig.text.push_str(&nested.text);
916 sig.defs.extend(nested.defs.into_iter());
917 sig.refs.extend(nested.refs.into_iter());
921 if let ast::FunctionRetTy::Ty(ref t) = m.decl.output {
922 sig.text.push_str(" -> ");
923 let nested = t.make(sig.text.len(), None, scx)?;
924 sig.text.push_str(&nested.text);
925 sig.defs.extend(nested.defs.into_iter());
926 sig.refs.extend(nested.refs.into_iter());
928 sig.text.push_str(" {}");