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// A signature is a string representation of an item's type signature, excluding
// any body. It also includes ids for any defs or refs in the signature. For
// example:
//
// ```
// fn foo(x: String) {
// println!("{}", x);
// }
// ```
// The signature string is something like "fn foo(x: String) {}" and the signature
// will have defs for `foo` and `x` and a ref for `String`.
//
// All signature text should parse in the correct context (i.e., in a module or
// impl, etc.). Clients may want to trim trailing `{}` or `;`. The text of a
// signature is not guaranteed to be stable (it may improve or change as the
// syntax changes, or whitespace or punctuation may change). It is also likely
// not to be pretty - no attempt is made to prettify the text. It is recommended
// that clients run the text through Rustfmt.
//
// This module generates Signatures for items by walking the AST and looking up
// references.
//
// Signatures do not include visibility info. I'm not sure if this is a feature
// or an ommission (FIXME).
//
// FIXME where clauses need implementing, defs/refs in generics are mostly missing.
use crate::{id_from_def_id, id_from_node_id, SaveContext};
use rls_data::{SigElement, Signature};
use rustc::hir::def::{Res, DefKind};
use syntax::ast::{self, NodeId};
use syntax::print::pprust;
pub fn item_signature(item: &ast::Item, scx: &SaveContext<'_, '_>) -> Option<Signature> {
if !scx.config.signatures {
return None;
}
item.make(0, None, scx).ok()
}
pub fn foreign_item_signature(
item: &ast::ForeignItem,
scx: &SaveContext<'_, '_>
) -> Option<Signature> {
if !scx.config.signatures {
return None;
}
item.make(0, None, scx).ok()
}
/// Signature for a struct or tuple field declaration.
/// Does not include a trailing comma.
pub fn field_signature(field: &ast::StructField, scx: &SaveContext<'_, '_>) -> Option<Signature> {
if !scx.config.signatures {
return None;
}
field.make(0, None, scx).ok()
}
/// Does not include a trailing comma.
pub fn variant_signature(variant: &ast::Variant, scx: &SaveContext<'_, '_>) -> Option<Signature> {
if !scx.config.signatures {
return None;
}
variant.node.make(0, None, scx).ok()
}
pub fn method_signature(
id: NodeId,
ident: ast::Ident,
generics: &ast::Generics,
m: &ast::MethodSig,
scx: &SaveContext<'_, '_>,
) -> Option<Signature> {
if !scx.config.signatures {
return None;
}
make_method_signature(id, ident, generics, m, scx).ok()
}
pub fn assoc_const_signature(
id: NodeId,
ident: ast::Name,
ty: &ast::Ty,
default: Option<&ast::Expr>,
scx: &SaveContext<'_, '_>,
) -> Option<Signature> {
if !scx.config.signatures {
return None;
}
make_assoc_const_signature(id, ident, ty, default, scx).ok()
}
pub fn assoc_type_signature(
id: NodeId,
ident: ast::Ident,
bounds: Option<&ast::GenericBounds>,
default: Option<&ast::Ty>,
scx: &SaveContext<'_, '_>,
) -> Option<Signature> {
if !scx.config.signatures {
return None;
}
make_assoc_type_signature(id, ident, bounds, default, scx).ok()
}
type Result = std::result::Result<Signature, &'static str>;
trait Sig {
fn make(&self, offset: usize, id: Option<NodeId>, scx: &SaveContext<'_, '_>) -> Result;
}
fn extend_sig(
mut sig: Signature,
text: String,
defs: Vec<SigElement>,
refs: Vec<SigElement>,
) -> Signature {
sig.text = text;
sig.defs.extend(defs.into_iter());
sig.refs.extend(refs.into_iter());
sig
}
fn replace_text(mut sig: Signature, text: String) -> Signature {
sig.text = text;
sig
}
fn merge_sigs(text: String, sigs: Vec<Signature>) -> Signature {
let mut result = Signature {
text,
defs: vec![],
refs: vec![],
};
let (defs, refs): (Vec<_>, Vec<_>) = sigs.into_iter().map(|s| (s.defs, s.refs)).unzip();
result
.defs
.extend(defs.into_iter().flat_map(|ds| ds.into_iter()));
result
.refs
.extend(refs.into_iter().flat_map(|rs| rs.into_iter()));
result
}
fn text_sig(text: String) -> Signature {
Signature {
text,
defs: vec![],
refs: vec![],
}
}
impl Sig for ast::Ty {
fn make(&self, offset: usize, _parent_id: Option<NodeId>, scx: &SaveContext<'_, '_>) -> Result {
let id = Some(self.id);
match self.node {
ast::TyKind::Slice(ref ty) => {
let nested = ty.make(offset + 1, id, scx)?;
let text = format!("[{}]", nested.text);
Ok(replace_text(nested, text))
}
ast::TyKind::Ptr(ref mt) => {
let prefix = match mt.mutbl {
ast::Mutability::Mutable => "*mut ",
ast::Mutability::Immutable => "*const ",
};
let nested = mt.ty.make(offset + prefix.len(), id, scx)?;
let text = format!("{}{}", prefix, nested.text);
Ok(replace_text(nested, text))
}
ast::TyKind::Rptr(ref lifetime, ref mt) => {
let mut prefix = "&".to_owned();
if let &Some(ref l) = lifetime {
prefix.push_str(&l.ident.to_string());
prefix.push(' ');
}
if let ast::Mutability::Mutable = mt.mutbl {
prefix.push_str("mut ");
};
let nested = mt.ty.make(offset + prefix.len(), id, scx)?;
let text = format!("{}{}", prefix, nested.text);
Ok(replace_text(nested, text))
}
ast::TyKind::Never => Ok(text_sig("!".to_owned())),
ast::TyKind::CVarArgs => Ok(text_sig("...".to_owned())),
ast::TyKind::Tup(ref ts) => {
let mut text = "(".to_owned();
let mut defs = vec![];
let mut refs = vec![];
for t in ts {
let nested = t.make(offset + text.len(), id, scx)?;
text.push_str(&nested.text);
text.push(',');
defs.extend(nested.defs.into_iter());
refs.extend(nested.refs.into_iter());
}
text.push(')');
Ok(Signature { text, defs, refs })
}
ast::TyKind::Paren(ref ty) => {
let nested = ty.make(offset + 1, id, scx)?;
let text = format!("({})", nested.text);
Ok(replace_text(nested, text))
}
ast::TyKind::BareFn(ref f) => {
let mut text = String::new();
if !f.generic_params.is_empty() {
// FIXME defs, bounds on lifetimes
text.push_str("for<");
text.push_str(&f.generic_params
.iter()
.filter_map(|param| match param.kind {
ast::GenericParamKind::Lifetime { .. } => {
Some(param.ident.to_string())
}
_ => None,
})
.collect::<Vec<_>>()
.join(", "));
text.push('>');
}
if f.unsafety == ast::Unsafety::Unsafe {
text.push_str("unsafe ");
}
if f.abi != rustc_target::spec::abi::Abi::Rust {
text.push_str("extern");
text.push_str(&f.abi.to_string());
text.push(' ');
}
text.push_str("fn(");
let mut defs = vec![];
let mut refs = vec![];
for i in &f.decl.inputs {
let nested = i.ty.make(offset + text.len(), Some(i.id), scx)?;
text.push_str(&nested.text);
text.push(',');
defs.extend(nested.defs.into_iter());
refs.extend(nested.refs.into_iter());
}
text.push(')');
if let ast::FunctionRetTy::Ty(ref t) = f.decl.output {
text.push_str(" -> ");
let nested = t.make(offset + text.len(), None, scx)?;
text.push_str(&nested.text);
text.push(',');
defs.extend(nested.defs.into_iter());
refs.extend(nested.refs.into_iter());
}
Ok(Signature { text, defs, refs })
}
ast::TyKind::Path(None, ref path) => path.make(offset, id, scx),
ast::TyKind::Path(Some(ref qself), ref path) => {
let nested_ty = qself.ty.make(offset + 1, id, scx)?;
let prefix = if qself.position == 0 {
format!("<{}>::", nested_ty.text)
} else if qself.position == 1 {
let first = pprust::path_segment_to_string(&path.segments[0]);
format!("<{} as {}>::", nested_ty.text, first)
} else {
// FIXME handle path instead of elipses.
format!("<{} as ...>::", nested_ty.text)
};
let name = pprust::path_segment_to_string(path.segments.last().ok_or("Bad path")?);
let res = scx.get_path_res(id.ok_or("Missing id for Path")?);
let id = id_from_def_id(res.def_id());
if path.segments.len() - qself.position == 1 {
let start = offset + prefix.len();
let end = start + name.len();
Ok(Signature {
text: prefix + &name,
defs: vec![],
refs: vec![SigElement { id, start, end }],
})
} else {
let start = offset + prefix.len() + 5;
let end = start + name.len();
// FIXME should put the proper path in there, not elipses.
Ok(Signature {
text: prefix + "...::" + &name,
defs: vec![],
refs: vec![SigElement { id, start, end }],
})
}
}
ast::TyKind::TraitObject(ref bounds, ..) => {
// FIXME recurse into bounds
let nested = pprust::bounds_to_string(bounds);
Ok(text_sig(nested))
}
ast::TyKind::ImplTrait(_, ref bounds) => {
// FIXME recurse into bounds
let nested = pprust::bounds_to_string(bounds);
Ok(text_sig(format!("impl {}", nested)))
}
ast::TyKind::Array(ref ty, ref v) => {
let nested_ty = ty.make(offset + 1, id, scx)?;
let expr = pprust::expr_to_string(&v.value).replace('\n', " ");
let text = format!("[{}; {}]", nested_ty.text, expr);
Ok(replace_text(nested_ty, text))
}
ast::TyKind::Typeof(_) |
ast::TyKind::Infer |
ast::TyKind::Err |
ast::TyKind::ImplicitSelf |
ast::TyKind::Mac(_) => Err("Ty"),
}
}
}
impl Sig for ast::Item {
fn make(&self, offset: usize, _parent_id: Option<NodeId>, scx: &SaveContext<'_, '_>) -> Result {
let id = Some(self.id);
match self.node {
ast::ItemKind::Static(ref ty, m, ref expr) => {
let mut text = "static ".to_owned();
if m == ast::Mutability::Mutable {
text.push_str("mut ");
}
let name = self.ident.to_string();
let defs = vec![
SigElement {
id: id_from_node_id(self.id, scx),
start: offset + text.len(),
end: offset + text.len() + name.len(),
},
];
text.push_str(&name);
text.push_str(": ");
let ty = ty.make(offset + text.len(), id, scx)?;
text.push_str(&ty.text);
text.push_str(" = ");
let expr = pprust::expr_to_string(expr).replace('\n', " ");
text.push_str(&expr);
text.push(';');
Ok(extend_sig(ty, text, defs, vec![]))
}
ast::ItemKind::Const(ref ty, ref expr) => {
let mut text = "const ".to_owned();
let name = self.ident.to_string();
let defs = vec![
SigElement {
id: id_from_node_id(self.id, scx),
start: offset + text.len(),
end: offset + text.len() + name.len(),
},
];
text.push_str(&name);
text.push_str(": ");
let ty = ty.make(offset + text.len(), id, scx)?;
text.push_str(&ty.text);
text.push_str(" = ");
let expr = pprust::expr_to_string(expr).replace('\n', " ");
text.push_str(&expr);
text.push(';');
Ok(extend_sig(ty, text, defs, vec![]))
}
ast::ItemKind::Fn(ref decl, header, ref generics, _) => {
let mut text = String::new();
if header.constness.node == ast::Constness::Const {
text.push_str("const ");
}
if header.asyncness.node.is_async() {
text.push_str("async ");
}
if header.unsafety == ast::Unsafety::Unsafe {
text.push_str("unsafe ");
}
if header.abi != rustc_target::spec::abi::Abi::Rust {
text.push_str("extern");
text.push_str(&header.abi.to_string());
text.push(' ');
}
text.push_str("fn ");
let mut sig = name_and_generics(text, offset, generics, self.id, self.ident, scx)?;
sig.text.push('(');
for i in &decl.inputs {
// FIXME should descend into patterns to add defs.
sig.text.push_str(&pprust::pat_to_string(&i.pat));
sig.text.push_str(": ");
let nested = i.ty.make(offset + sig.text.len(), Some(i.id), scx)?;
sig.text.push_str(&nested.text);
sig.text.push(',');
sig.defs.extend(nested.defs.into_iter());
sig.refs.extend(nested.refs.into_iter());
}
sig.text.push(')');
if let ast::FunctionRetTy::Ty(ref t) = decl.output {
sig.text.push_str(" -> ");
let nested = t.make(offset + sig.text.len(), None, scx)?;
sig.text.push_str(&nested.text);
sig.defs.extend(nested.defs.into_iter());
sig.refs.extend(nested.refs.into_iter());
}
sig.text.push_str(" {}");
Ok(sig)
}
ast::ItemKind::Mod(ref _mod) => {
let mut text = "mod ".to_owned();
let name = self.ident.to_string();
let defs = vec![
SigElement {
id: id_from_node_id(self.id, scx),
start: offset + text.len(),
end: offset + text.len() + name.len(),
},
];
text.push_str(&name);
// Could be either `mod foo;` or `mod foo { ... }`, but we'll just pick one.
text.push(';');
Ok(Signature {
text,
defs,
refs: vec![],
})
}
ast::ItemKind::Existential(ref bounds, ref generics) => {
let text = "existential type ".to_owned();
let mut sig = name_and_generics(text, offset, generics, self.id, self.ident, scx)?;
if !bounds.is_empty() {
sig.text.push_str(": ");
sig.text.push_str(&pprust::bounds_to_string(bounds));
}
sig.text.push(';');
Ok(sig)
}
ast::ItemKind::Ty(ref ty, ref generics) => {
let text = "type ".to_owned();
let mut sig = name_and_generics(text, offset, generics, self.id, self.ident, scx)?;
sig.text.push_str(" = ");
let ty = ty.make(offset + sig.text.len(), id, scx)?;
sig.text.push_str(&ty.text);
sig.text.push(';');
Ok(merge_sigs(sig.text.clone(), vec![sig, ty]))
}
ast::ItemKind::Enum(_, ref generics) => {
let text = "enum ".to_owned();
let mut sig = name_and_generics(text, offset, generics, self.id, self.ident, scx)?;
sig.text.push_str(" {}");
Ok(sig)
}
ast::ItemKind::Struct(_, ref generics) => {
let text = "struct ".to_owned();
let mut sig = name_and_generics(text, offset, generics, self.id, self.ident, scx)?;
sig.text.push_str(" {}");
Ok(sig)
}
ast::ItemKind::Union(_, ref generics) => {
let text = "union ".to_owned();
let mut sig = name_and_generics(text, offset, generics, self.id, self.ident, scx)?;
sig.text.push_str(" {}");
Ok(sig)
}
ast::ItemKind::Trait(is_auto, unsafety, ref generics, ref bounds, _) => {
let mut text = String::new();
if is_auto == ast::IsAuto::Yes {
text.push_str("auto ");
}
if unsafety == ast::Unsafety::Unsafe {
text.push_str("unsafe ");
}
text.push_str("trait ");
let mut sig = name_and_generics(text, offset, generics, self.id, self.ident, scx)?;
if !bounds.is_empty() {
sig.text.push_str(": ");
sig.text.push_str(&pprust::bounds_to_string(bounds));
}
// FIXME where clause
sig.text.push_str(" {}");
Ok(sig)
}
ast::ItemKind::TraitAlias(ref generics, ref bounds) => {
let mut text = String::new();
text.push_str("trait ");
let mut sig = name_and_generics(text,
offset,
generics,
self.id,
self.ident,
scx)?;
if !bounds.is_empty() {
sig.text.push_str(" = ");
sig.text.push_str(&pprust::bounds_to_string(bounds));
}
// FIXME where clause
sig.text.push_str(";");
Ok(sig)
}
ast::ItemKind::Impl(
unsafety,
polarity,
defaultness,
ref generics,
ref opt_trait,
ref ty,
_,
) => {
let mut text = String::new();
if let ast::Defaultness::Default = defaultness {
text.push_str("default ");
}
if unsafety == ast::Unsafety::Unsafe {
text.push_str("unsafe ");
}
text.push_str("impl");
let generics_sig = generics.make(offset + text.len(), id, scx)?;
text.push_str(&generics_sig.text);
text.push(' ');
let trait_sig = if let Some(ref t) = *opt_trait {
if polarity == ast::ImplPolarity::Negative {
text.push('!');
}
let trait_sig = t.path.make(offset + text.len(), id, scx)?;
text.push_str(&trait_sig.text);
text.push_str(" for ");
trait_sig
} else {
text_sig(String::new())
};
let ty_sig = ty.make(offset + text.len(), id, scx)?;
text.push_str(&ty_sig.text);
text.push_str(" {}");
Ok(merge_sigs(text, vec![generics_sig, trait_sig, ty_sig]))
// FIXME where clause
}
ast::ItemKind::ForeignMod(_) => Err("extern mod"),
ast::ItemKind::GlobalAsm(_) => Err("glboal asm"),
ast::ItemKind::ExternCrate(_) => Err("extern crate"),
// FIXME should implement this (e.g., pub use).
ast::ItemKind::Use(_) => Err("import"),
ast::ItemKind::Mac(..) | ast::ItemKind::MacroDef(_) => Err("Macro"),
}
}
}
impl Sig for ast::Path {
fn make(&self, offset: usize, id: Option<NodeId>, scx: &SaveContext<'_, '_>) -> Result {
let res = scx.get_path_res(id.ok_or("Missing id for Path")?);
let (name, start, end) = match res {
Res::PrimTy(..) | Res::SelfTy(..) | Res::Err => {
return Ok(Signature {
text: pprust::path_to_string(self),
defs: vec![],
refs: vec![],
})
}
Res::Def(DefKind::AssocConst, _)
| Res::Def(DefKind::Variant, _)
| Res::Def(DefKind::Ctor(..), _) => {
let len = self.segments.len();
if len < 2 {
return Err("Bad path");
}
// FIXME: really we should descend into the generics here and add SigElements for
// them.
// FIXME: would be nice to have a def for the first path segment.
let seg1 = pprust::path_segment_to_string(&self.segments[len - 2]);
let seg2 = pprust::path_segment_to_string(&self.segments[len - 1]);
let start = offset + seg1.len() + 2;
(format!("{}::{}", seg1, seg2), start, start + seg2.len())
}
_ => {
let name = pprust::path_segment_to_string(self.segments.last().ok_or("Bad path")?);
let end = offset + name.len();
(name, offset, end)
}
};
let id = id_from_def_id(res.def_id());
Ok(Signature {
text: name,
defs: vec![],
refs: vec![SigElement { id, start, end }],
})
}
}
// This does not cover the where clause, which must be processed separately.
impl Sig for ast::Generics {
fn make(&self, offset: usize, _parent_id: Option<NodeId>, scx: &SaveContext<'_, '_>) -> Result {
if self.params.is_empty() {
return Ok(text_sig(String::new()));
}
let mut text = "<".to_owned();
let mut defs = Vec::with_capacity(self.params.len());
for param in &self.params {
let mut param_text = String::new();
if let ast::GenericParamKind::Const { .. } = param.kind {
param_text.push_str("const ");
}
param_text.push_str(&param.ident.as_str());
defs.push(SigElement {
id: id_from_node_id(param.id, scx),
start: offset + text.len(),
end: offset + text.len() + param_text.as_str().len(),
});
if let ast::GenericParamKind::Const { ref ty } = param.kind {
param_text.push_str(": ");
param_text.push_str(&pprust::ty_to_string(&ty));
}
if !param.bounds.is_empty() {
param_text.push_str(": ");
match param.kind {
ast::GenericParamKind::Lifetime { .. } => {
let bounds = param.bounds.iter()
.map(|bound| match bound {
ast::GenericBound::Outlives(lt) => lt.ident.to_string(),
_ => panic!(),
})
.collect::<Vec<_>>()
.join(" + ");
param_text.push_str(&bounds);
// FIXME add lifetime bounds refs.
}
ast::GenericParamKind::Type { .. } => {
param_text.push_str(&pprust::bounds_to_string(&param.bounds));
// FIXME descend properly into bounds.
}
ast::GenericParamKind::Const { .. } => {
// Const generics cannot contain bounds.
}
}
}
text.push_str(&param_text);
text.push(',');
}
text.push('>');
Ok(Signature {
text,
defs,
refs: vec![],
})
}
}
impl Sig for ast::StructField {
fn make(&self, offset: usize, _parent_id: Option<NodeId>, scx: &SaveContext<'_, '_>) -> Result {
let mut text = String::new();
let mut defs = None;
if let Some(ident) = self.ident {
text.push_str(&ident.to_string());
defs = Some(SigElement {
id: id_from_node_id(self.id, scx),
start: offset,
end: offset + text.len(),
});
text.push_str(": ");
}
let mut ty_sig = self.ty.make(offset + text.len(), Some(self.id), scx)?;
text.push_str(&ty_sig.text);
ty_sig.text = text;
ty_sig.defs.extend(defs.into_iter());
Ok(ty_sig)
}
}
impl Sig for ast::Variant_ {
fn make(&self, offset: usize, parent_id: Option<NodeId>, scx: &SaveContext<'_, '_>) -> Result {
let mut text = self.ident.to_string();
match self.data {
ast::VariantData::Struct(ref fields, r) => {
let id = parent_id.unwrap();
let name_def = SigElement {
id: id_from_node_id(id, scx),
start: offset,
end: offset + text.len(),
};
text.push_str(" { ");
let mut defs = vec![name_def];
let mut refs = vec![];
if r {
text.push_str("/* parse error */ ");
} else {
for f in fields {
let field_sig = f.make(offset + text.len(), Some(id), scx)?;
text.push_str(&field_sig.text);
text.push_str(", ");
defs.extend(field_sig.defs.into_iter());
refs.extend(field_sig.refs.into_iter());
}
}
text.push('}');
Ok(Signature { text, defs, refs })
}
ast::VariantData::Tuple(ref fields, id) => {
let name_def = SigElement {
id: id_from_node_id(id, scx),
start: offset,
end: offset + text.len(),
};
text.push('(');
let mut defs = vec![name_def];
let mut refs = vec![];
for f in fields {
let field_sig = f.make(offset + text.len(), Some(id), scx)?;
text.push_str(&field_sig.text);
text.push_str(", ");
defs.extend(field_sig.defs.into_iter());
refs.extend(field_sig.refs.into_iter());
}
text.push(')');
Ok(Signature { text, defs, refs })
}
ast::VariantData::Unit(id) => {
let name_def = SigElement {
id: id_from_node_id(id, scx),
start: offset,
end: offset + text.len(),
};
Ok(Signature {
text,
defs: vec![name_def],
refs: vec![],
})
}
}
}
}
impl Sig for ast::ForeignItem {
fn make(&self, offset: usize, _parent_id: Option<NodeId>, scx: &SaveContext<'_, '_>) -> Result {
let id = Some(self.id);
match self.node {
ast::ForeignItemKind::Fn(ref decl, ref generics) => {
let mut text = String::new();
text.push_str("fn ");
let mut sig = name_and_generics(text, offset, generics, self.id, self.ident, scx)?;
sig.text.push('(');
for i in &decl.inputs {
// FIXME should descend into patterns to add defs.
sig.text.push_str(&pprust::pat_to_string(&i.pat));
sig.text.push_str(": ");
let nested = i.ty.make(offset + sig.text.len(), Some(i.id), scx)?;
sig.text.push_str(&nested.text);
sig.text.push(',');
sig.defs.extend(nested.defs.into_iter());
sig.refs.extend(nested.refs.into_iter());
}
sig.text.push(')');
if let ast::FunctionRetTy::Ty(ref t) = decl.output {
sig.text.push_str(" -> ");
let nested = t.make(offset + sig.text.len(), None, scx)?;
sig.text.push_str(&nested.text);
sig.defs.extend(nested.defs.into_iter());
sig.refs.extend(nested.refs.into_iter());
}
sig.text.push(';');
Ok(sig)
}
ast::ForeignItemKind::Static(ref ty, m) => {
let mut text = "static ".to_owned();
if m == ast::Mutability::Mutable {
text.push_str("mut ");
}
let name = self.ident.to_string();
let defs = vec![
SigElement {
id: id_from_node_id(self.id, scx),
start: offset + text.len(),
end: offset + text.len() + name.len(),
},
];
text.push_str(&name);
text.push_str(": ");
let ty_sig = ty.make(offset + text.len(), id, scx)?;
text.push(';');
Ok(extend_sig(ty_sig, text, defs, vec![]))
}
ast::ForeignItemKind::Ty => {
let mut text = "type ".to_owned();
let name = self.ident.to_string();
let defs = vec![
SigElement {
id: id_from_node_id(self.id, scx),
start: offset + text.len(),
end: offset + text.len() + name.len(),
},
];
text.push_str(&name);
text.push(';');
Ok(Signature {
text: text,
defs: defs,
refs: vec![],
})
}
ast::ForeignItemKind::Macro(..) => Err("macro"),
}
}
}
fn name_and_generics(
mut text: String,
offset: usize,
generics: &ast::Generics,
id: NodeId,
name: ast::Ident,
scx: &SaveContext<'_, '_>,
) -> Result {
let name = name.to_string();
let def = SigElement {
id: id_from_node_id(id, scx),
start: offset + text.len(),
end: offset + text.len() + name.len(),
};
text.push_str(&name);
let generics: Signature = generics.make(offset + text.len(), Some(id), scx)?;
// FIXME where clause
let text = format!("{}{}", text, generics.text);
Ok(extend_sig(generics, text, vec![def], vec![]))
}
fn make_assoc_type_signature(
id: NodeId,
ident: ast::Ident,
bounds: Option<&ast::GenericBounds>,
default: Option<&ast::Ty>,
scx: &SaveContext<'_, '_>,
) -> Result {
let mut text = "type ".to_owned();
let name = ident.to_string();
let mut defs = vec![
SigElement {
id: id_from_node_id(id, scx),
start: text.len(),
end: text.len() + name.len(),
},
];
let mut refs = vec![];
text.push_str(&name);
if let Some(bounds) = bounds {
text.push_str(": ");
// FIXME should descend into bounds
text.push_str(&pprust::bounds_to_string(bounds));
}
if let Some(default) = default {
text.push_str(" = ");
let ty_sig = default.make(text.len(), Some(id), scx)?;
text.push_str(&ty_sig.text);
defs.extend(ty_sig.defs.into_iter());
refs.extend(ty_sig.refs.into_iter());
}
text.push(';');
Ok(Signature { text, defs, refs })
}
fn make_assoc_const_signature(
id: NodeId,
ident: ast::Name,
ty: &ast::Ty,
default: Option<&ast::Expr>,
scx: &SaveContext<'_, '_>,
) -> Result {
let mut text = "const ".to_owned();
let name = ident.to_string();
let mut defs = vec![
SigElement {
id: id_from_node_id(id, scx),
start: text.len(),
end: text.len() + name.len(),
},
];
let mut refs = vec![];
text.push_str(&name);
text.push_str(": ");
let ty_sig = ty.make(text.len(), Some(id), scx)?;
text.push_str(&ty_sig.text);
defs.extend(ty_sig.defs.into_iter());
refs.extend(ty_sig.refs.into_iter());
if let Some(default) = default {
text.push_str(" = ");
text.push_str(&pprust::expr_to_string(default));
}
text.push(';');
Ok(Signature { text, defs, refs })
}
fn make_method_signature(
id: NodeId,
ident: ast::Ident,
generics: &ast::Generics,
m: &ast::MethodSig,
scx: &SaveContext<'_, '_>,
) -> Result {
// FIXME code dup with function signature
let mut text = String::new();
if m.header.constness.node == ast::Constness::Const {
text.push_str("const ");
}
if m.header.asyncness.node.is_async() {
text.push_str("async ");
}
if m.header.unsafety == ast::Unsafety::Unsafe {
text.push_str("unsafe ");
}
if m.header.abi != rustc_target::spec::abi::Abi::Rust {
text.push_str("extern");
text.push_str(&m.header.abi.to_string());
text.push(' ');
}
text.push_str("fn ");
let mut sig = name_and_generics(text, 0, generics, id, ident, scx)?;
sig.text.push('(');
for i in &m.decl.inputs {
// FIXME should descend into patterns to add defs.
sig.text.push_str(&pprust::pat_to_string(&i.pat));
sig.text.push_str(": ");
let nested = i.ty.make(sig.text.len(), Some(i.id), scx)?;
sig.text.push_str(&nested.text);
sig.text.push(',');
sig.defs.extend(nested.defs.into_iter());
sig.refs.extend(nested.refs.into_iter());
}
sig.text.push(')');
if let ast::FunctionRetTy::Ty(ref t) = m.decl.output {
sig.text.push_str(" -> ");
let nested = t.make(sig.text.len(), None, scx)?;
sig.text.push_str(&nested.text);
sig.defs.extend(nested.defs.into_iter());
sig.refs.extend(nested.refs.into_iter());
}
sig.text.push_str(" {}");
Ok(sig)
}
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