--- /dev/null
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// FIXME? None of these include visibility info.
+// Large outstanding things - where clauses, defs/refs for generics
+// paresable - each sig ends with `;` of ` {}`
+
+use SaveContext;
+
+use rls_data::{Signature, SigElement, Id};
+
+use rustc::hir::def::Def;
+use rustc::hir::def_id::DefId;
+use syntax::ast::{self, NodeId};
+use syntax::print::pprust;
+
+
+// TODO dup from json_dumper
+fn id_from_def_id(id: DefId) -> Id {
+ Id {
+ krate: id.krate.as_u32(),
+ index: id.index.as_u32(),
+ }
+}
+
+fn id_from_node_id(id: NodeId, scx: &SaveContext) -> Id {
+ let def_id = scx.tcx.hir.local_def_id(id);
+ id_from_def_id(def_id)
+}
+
+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: 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::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.lifetimes.is_empty() {
+ // FIXME defs, bounds on lifetimes
+ text.push_str("for<");
+ text.push_str(&f.lifetimes.iter().map(|l|
+ l.lifetime.ident.to_string()).collect::<Vec<_>>().join(", "));
+ text.push('>');
+ }
+
+ if f.unsafety == ast::Unsafety::Unsafe {
+ text.push_str("unsafe ");
+ }
+ if f.abi != ::syntax::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 def = scx.get_path_def(id.ok_or("Missing id for Path")?);
+ let id = id_from_def_id(def.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).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);
+
+ let name_and_generics = |mut text: String, generics: &ast::Generics| -> Result {
+ let name = self.ident.to_string();
+ let def = SigElement {
+ id: id_from_node_id(self.id, scx),
+ start: offset + 5,
+ end: offset + 5 + name.len(),
+ };
+ text.push_str(&name);
+ let generics: Signature = generics.make(offset + text.len(), id, scx)?;
+ // FIXME where clause
+ let text = format!("{}{}", text, generics.text);
+ Ok(extend_sig(generics, text, vec![def], vec![]))
+ };
+
+ 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, unsafety, constness, abi, ref generics, _) => {
+ let mut text = String::new();
+ if constness.node == ast::Constness::Const {
+ text.push_str("const ");
+ }
+ if unsafety == ast::Unsafety::Unsafe {
+ text.push_str("unsafe ");
+ }
+ if abi != ::syntax::abi::Abi::Rust {
+ text.push_str("extern");
+ text.push_str(&abi.to_string());
+ text.push(' ');
+ }
+ text.push_str("fn ");
+
+ let mut sig = name_and_generics(text, generics)?;
+
+ sig.text.push('(');
+ for i in &decl.inputs {
+ // FIXME shoudl 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.text.push(',');
+ sig.defs.extend(nested.defs.into_iter());
+ sig.refs.extend(nested.refs.into_iter());
+ }
+
+ 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 puck one.
+ text.push(';');
+
+ Ok(Signature {
+ text,
+ defs,
+ refs: vec![],
+ })
+ }
+ ast::ItemKind::Ty(ref ty, ref generics) => {
+ let text = "type ".to_owned();
+ let mut sig = name_and_generics(text, generics)?;
+
+ 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, generics)?;
+ sig.text.push_str(" {}");
+ Ok(sig)
+ }
+ ast::ItemKind::Struct(_, ref generics) => {
+ let text = "struct ".to_owned();
+ let mut sig = name_and_generics(text, generics)?;
+ sig.text.push_str(" {}");
+ Ok(sig)
+ }
+ ast::ItemKind::Union(_, ref generics) => {
+ let text = "union ".to_owned();
+ let mut sig = name_and_generics(text, generics)?;
+ sig.text.push_str(" {}");
+ Ok(sig)
+ }
+ ast::ItemKind::Trait(unsafety, ref generics, ref bounds, _) => {
+ let mut text = String::new();
+ if unsafety == ast::Unsafety::Unsafe {
+ text.push_str("unsafe ");
+ }
+ text.push_str("trait ");
+ let mut sig = name_and_generics(text, generics)?;
+
+ 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::DefaultImpl(unsafety, ref trait_ref) => {
+ let mut text = String::new();
+ if unsafety == ast::Unsafety::Unsafe {
+ text.push_str("unsafe ");
+ }
+ text.push_str("impl ");
+ let trait_sig = trait_ref.path.make(offset + text.len(), id, scx)?;
+ text.push_str(&trait_sig.text);
+ text.push_str(" for .. {}");
+ Ok(replace_text(trait_sig, text))
+ }
+ 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 def = scx.get_path_def(id.ok_or("Missing id for Path")?);
+ let id = id_from_def_id(def.def_id());
+
+ let (name, start, end) = match def {
+ Def::AssociatedConst(..) |
+ Def::Variant(..) |
+ Def::VariantCtor(..) => {
+ 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)
+ }
+ };
+
+ 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 {
+ let total = self.lifetimes.len() + self.ty_params.len();
+ if total == 0 {
+ return Ok(text_sig(String::new()));
+ }
+
+ let mut text = "<".to_owned();
+
+ let mut defs = vec![];
+ for l in &self.lifetimes {
+ let mut l_text = l.lifetime.ident.to_string();
+ defs.push(SigElement {
+ id: id_from_node_id(l.lifetime.id, scx),
+ start: offset + text.len(),
+ end: offset + text.len() + l_text.len(),
+ });
+
+ if !l.bounds.is_empty() {
+ l_text.push_str(": ");
+ let bounds = l.bounds.iter().map(|l| l.ident.to_string()).collect::<Vec<_>>().join(" + ");
+ l_text.push_str(&bounds);
+ // FIXME add lifetime bounds refs.
+ }
+ text.push_str(&l_text);
+ text.push(',');
+ }
+ for t in &self.ty_params {
+ let mut t_text = t.ident.to_string();
+ defs.push(SigElement {
+ id: id_from_node_id(t.id, scx),
+ start: offset + text.len(),
+ end: offset + text.len() + t_text.len(),
+ });
+
+ if !t.bounds.is_empty() {
+ t_text.push_str(": ");
+ t_text.push_str(&pprust::bounds_to_string(&t.bounds));
+ // FIXME descend properly into bounds.
+ }
+ text.push_str(&t_text);
+ text.push(',');
+ }
+
+ text.push('>');
+ Ok(Signature {text, defs, refs: vec![] })
+ }
+}
+
+// TODO impl items, trait items
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