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Replace Display by a pretty printing trait for Ty

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This allows removing the names from Adt and FnDef (and more later), as a first
step towards aligning more with chalk's Ty :)
This commit is contained in:
Florian Diebold 2019-03-14 22:03:39 +01:00 committed by Florian Diebold
parent eb4d6cf25f
commit c5ee60e05b
7 changed files with 136 additions and 60 deletions
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2
crates/ra_hir/src/lib.rs
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@ -56,7 +56,7 @@ pub use self::{
ids::{HirFileId, MacroCallId, MacroCallLoc, HirInterner},
macros::{MacroDef, MacroInput, MacroExpansion},
nameres::{ItemMap, PerNs, Namespace},
ty::{Ty, Substs},
ty::{Ty, Substs, display::HirDisplay},
impl_block::{ImplBlock, ImplItem},
docs::{Docs, Documentation},
adt::AdtDef,

94
crates/ra_hir/src/ty.rs
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@ -9,16 +9,16 @@ pub(crate) mod method_resolution;
mod op;
mod lower;
mod infer;
pub(crate) mod display;
use std::sync::Arc;
use std::{fmt, mem};
use join_to_string::join;
use crate::{Name, AdtDef, type_ref::Mutability};
use crate::{Name, AdtDef, type_ref::Mutability, db::HirDatabase};
pub(crate) use lower::{TypableDef, CallableDef, type_for_def, type_for_field};
pub(crate) use infer::{infer, InferenceResult, InferTy};
use display::{HirDisplay, HirFormatter};
/// A type. This is based on the `TyKind` enum in rustc (librustc/ty/sty.rs).
///
@ -42,8 +42,6 @@ pub enum Ty {
Adt {
/// The definition of the struct/enum.
def_id: AdtDef,
/// The name, for displaying.
name: Name,
/// Substitutions for the generic parameters of the type.
substs: Substs,
},
@ -79,8 +77,6 @@ pub enum Ty {
FnDef {
/// The definition of the function / constructor.
def: CallableDef,
/// For display
name: Name,
/// Parameters and return type
sig: Arc<FnSig>,
/// Substitutions for the generic parameters of the type
@ -265,8 +261,8 @@ impl Ty {
/// `Option<u32>` afterwards.)
pub fn apply_substs(self, substs: Substs) -> Ty {
match self {
Ty::Adt { def_id, name, .. } => Ty::Adt { def_id, name, substs },
Ty::FnDef { def, name, sig, .. } => Ty::FnDef { def, name, sig, substs },
Ty::Adt { def_id, .. } => Ty::Adt { def_id, substs },
Ty::FnDef { def, sig, .. } => Ty::FnDef { def, sig, substs },
_ => self,
}
}
@ -297,50 +293,80 @@ impl Ty {
}
}
impl fmt::Display for Ty {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
impl HirDisplay for &Ty {
fn hir_fmt(&self, f: &mut HirFormatter<impl HirDatabase>) -> fmt::Result {
HirDisplay::hir_fmt(*self, f)
}
}
impl HirDisplay for Ty {
fn hir_fmt(&self, f: &mut HirFormatter<impl HirDatabase>) -> fmt::Result {
match self {
Ty::Bool => write!(f, "bool"),
Ty::Char => write!(f, "char"),
Ty::Int(t) => write!(f, "{}", t.ty_to_string()),
Ty::Float(t) => write!(f, "{}", t.ty_to_string()),
Ty::Str => write!(f, "str"),
Ty::Slice(t) | Ty::Array(t) => write!(f, "[{}]", t),
Ty::RawPtr(t, m) => write!(f, "*{}{}", m.as_keyword_for_ptr(), t),
Ty::Ref(t, m) => write!(f, "&{}{}", m.as_keyword_for_ref(), t),
Ty::Never => write!(f, "!"),
Ty::Bool => write!(f, "bool")?,
Ty::Char => write!(f, "char")?,
Ty::Int(t) => write!(f, "{}", t.ty_to_string())?,
Ty::Float(t) => write!(f, "{}", t.ty_to_string())?,
Ty::Str => write!(f, "str")?,
Ty::Slice(t) | Ty::Array(t) => {
write!(f, "[{}]", t.display(f.db))?;
}
Ty::RawPtr(t, m) => {
write!(f, "*{}{}", m.as_keyword_for_ptr(), t.display(f.db))?;
}
Ty::Ref(t, m) => {
write!(f, "&{}{}", m.as_keyword_for_ref(), t.display(f.db))?;
}
Ty::Never => write!(f, "!")?,
Ty::Tuple(ts) => {
if ts.len() == 1 {
write!(f, "({},)", ts[0])
write!(f, "({},)", ts[0].display(f.db))?;
} else {
join(ts.iter()).surround_with("(", ")").separator(", ").to_fmt(f)
write!(f, "(")?;
f.write_joined(&**ts, ", ")?;
write!(f, ")")?;
}
}
Ty::FnPtr(sig) => {
join(sig.input.iter()).surround_with("fn(", ")").separator(", ").to_fmt(f)?;
write!(f, " -> {}", sig.output)
write!(f, "fn(")?;
f.write_joined(&sig.input, ", ")?;
write!(f, ") -> {}", sig.output.display(f.db))?;
}
Ty::FnDef { def, name, substs, sig, .. } => {
Ty::FnDef { def, substs, sig, .. } => {
let name = match def {
CallableDef::Function(ff) => ff.name(f.db),
CallableDef::Struct(s) => s.name(f.db).unwrap_or_else(Name::missing),
CallableDef::EnumVariant(e) => e.name(f.db).unwrap_or_else(Name::missing),
};
match def {
CallableDef::Function(_) => write!(f, "fn {}", name)?,
CallableDef::Struct(_) | CallableDef::EnumVariant(_) => write!(f, "{}", name)?,
}
if substs.0.len() > 0 {
join(substs.0.iter()).surround_with("<", ">").separator(", ").to_fmt(f)?;
write!(f, "<")?;
f.write_joined(&*substs.0, ", ")?;
write!(f, ">")?;
}
join(sig.input.iter()).surround_with("(", ")").separator(", ").to_fmt(f)?;
write!(f, " -> {}", sig.output)
write!(f, "(")?;
f.write_joined(&sig.input, ", ")?;
write!(f, ") -> {}", sig.output.display(f.db))?;
}
Ty::Adt { name, substs, .. } => {
Ty::Adt { def_id, substs, .. } => {
let name = match def_id {
AdtDef::Struct(s) => s.name(f.db),
AdtDef::Enum(e) => e.name(f.db),
}
.unwrap_or_else(Name::missing);
write!(f, "{}", name)?;
if substs.0.len() > 0 {
join(substs.0.iter()).surround_with("<", ">").separator(", ").to_fmt(f)?;
write!(f, "<")?;
f.write_joined(&*substs.0, ", ")?;
write!(f, ">")?;
}
Ok(())
}
Ty::Param { name, .. } => write!(f, "{}", name),
Ty::Unknown => write!(f, "{{unknown}}"),
Ty::Infer(..) => write!(f, "_"),
Ty::Param { name, .. } => write!(f, "{}", name)?,
Ty::Unknown => write!(f, "{{unknown}}")?,
Ty::Infer(..) => write!(f, "_")?,
}
Ok(())
}
}

56
crates/ra_hir/src/ty/display.rs Normal file
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@ -0,0 +1,56 @@
use std::fmt;
use crate::db::HirDatabase;
pub struct HirFormatter<'a, 'b, DB> {
pub db: &'a DB,
fmt: &'a mut fmt::Formatter<'b>,
}
pub trait HirDisplay {
fn hir_fmt(&self, f: &mut HirFormatter<impl HirDatabase>) -> fmt::Result;
fn display<'a, DB>(&'a self, db: &'a DB) -> HirDisplayWrapper<'a, DB, Self>
where
Self: Sized,
{
HirDisplayWrapper(db, self)
}
}
impl<'a, 'b, DB> HirFormatter<'a, 'b, DB>
where
DB: HirDatabase,
{
pub fn write_joined<T: HirDisplay>(
&mut self,
iter: impl IntoIterator<Item = T>,
sep: &str,
) -> fmt::Result {
let mut first = true;
for e in iter {
if !first {
write!(self, "{}", sep)?;
}
first = false;
e.hir_fmt(self)?;
}
Ok(())
}
/// This allows using the `write!` macro directly with a `HirFormatter`.
pub fn write_fmt(&mut self, args: fmt::Arguments) -> fmt::Result {
fmt::write(self.fmt, args)
}
}
pub struct HirDisplayWrapper<'a, DB, T>(&'a DB, &'a T);
impl<'a, DB, T> fmt::Display for HirDisplayWrapper<'a, DB, T>
where
DB: HirDatabase,
T: HirDisplay,
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.1.hir_fmt(&mut HirFormatter { db: self.0, fmt: f })
}
}

23
crates/ra_hir/src/ty/lower.rs
View File

@ -9,7 +9,7 @@
use std::sync::Arc;
use crate::{
Function, Struct, StructField, Enum, EnumVariant, Path, Name,
Function, Struct, StructField, Enum, EnumVariant, Path,
ModuleDef, TypeAlias,
Const, Static,
HirDatabase,
@ -232,13 +232,12 @@ fn type_for_fn(db: &impl HirDatabase, def: Function) -> Ty {
let signature = def.signature(db);
let resolver = def.resolver(db);
let generics = def.generic_params(db);
let name = def.name(db);
let input =
signature.params().iter().map(|tr| Ty::from_hir(db, &resolver, tr)).collect::<Vec<_>>();
let output = Ty::from_hir(db, &resolver, signature.ret_type());
let sig = Arc::new(FnSig { input, output });
let substs = make_substs(&generics);
Ty::FnDef { def: def.into(), sig, name, substs }
Ty::FnDef { def: def.into(), sig, substs }
}
/// Build the declared type of a const.
@ -266,7 +265,6 @@ fn type_for_struct_constructor(db: &impl HirDatabase, def: Struct) -> Ty {
};
let resolver = def.resolver(db);
let generics = def.generic_params(db);
let name = def.name(db).unwrap_or_else(Name::missing);
let input = fields
.iter()
.map(|(_, field)| Ty::from_hir(db, &resolver, &field.type_ref))
@ -274,7 +272,7 @@ fn type_for_struct_constructor(db: &impl HirDatabase, def: Struct) -> Ty {
let output = type_for_struct(db, def);
let sig = Arc::new(FnSig { input, output });
let substs = make_substs(&generics);
Ty::FnDef { def: def.into(), sig, name, substs }
Ty::FnDef { def: def.into(), sig, substs }
}
/// Build the type of a tuple enum variant constructor.
@ -286,7 +284,6 @@ fn type_for_enum_variant_constructor(db: &impl HirDatabase, def: EnumVariant) ->
};
let resolver = def.parent_enum(db).resolver(db);
let generics = def.parent_enum(db).generic_params(db);
let name = def.name(db).unwrap_or_else(Name::missing);
let input = fields
.iter()
.map(|(_, field)| Ty::from_hir(db, &resolver, &field.type_ref))
@ -294,7 +291,7 @@ fn type_for_enum_variant_constructor(db: &impl HirDatabase, def: EnumVariant) ->
let substs = make_substs(&generics);
let output = type_for_enum(db, def.parent_enum(db)).subst(&substs);
let sig = Arc::new(FnSig { input, output });
Ty::FnDef { def: def.into(), sig, name, substs }
Ty::FnDef { def: def.into(), sig, substs }
}
fn make_substs(generics: &GenericParams) -> Substs {
@ -310,20 +307,12 @@ fn make_substs(generics: &GenericParams) -> Substs {
fn type_for_struct(db: &impl HirDatabase, s: Struct) -> Ty {
let generics = s.generic_params(db);
Ty::Adt {
def_id: s.into(),
name: s.name(db).unwrap_or_else(Name::missing),
substs: make_substs(&generics),
}
Ty::Adt { def_id: s.into(), substs: make_substs(&generics) }
}
fn type_for_enum(db: &impl HirDatabase, s: Enum) -> Ty {
let generics = s.generic_params(db);
Ty::Adt {
def_id: s.into(),
name: s.name(db).unwrap_or_else(Name::missing),
substs: make_substs(&generics),
}
Ty::Adt { def_id: s.into(), substs: make_substs(&generics) }
}
fn type_for_type_alias(db: &impl HirDatabase, t: TypeAlias) -> Ty {

5
crates/ra_hir/src/ty/tests.rs
View File

@ -10,6 +10,7 @@ use test_utils::covers;
use crate::{
source_binder,
mock::MockDatabase,
ty::display::HirDisplay,
};
// These tests compare the inference results for all expressions in a file
@ -2142,7 +2143,7 @@ fn type_at_pos(db: &MockDatabase, pos: FilePosition) -> String {
let node = algo::find_node_at_offset::<ast::Expr>(syntax.syntax(), pos.offset).unwrap();
let expr = body_source_map.node_expr(node).unwrap();
let ty = &inference_result[expr];
ty.to_string()
ty.display(db).to_string()
}
fn infer(content: &str) -> String {
@ -2178,7 +2179,7 @@ fn infer(content: &str) -> String {
"{} '{}': {}\n",
syntax_ptr.range(),
ellipsize(node.text().to_string().replace("\n", " "), 15),
ty
ty.display(&db)
)
.unwrap();
}

11
crates/ra_ide_api/src/completion/presentation.rs
View File

@ -1,7 +1,7 @@
//! This modules takes care of rendering various defenitions as completion items.
use join_to_string::join;
use test_utils::tested_by;
use hir::{Docs, PerNs, Resolution};
use hir::{Docs, PerNs, Resolution, HirDisplay};
use ra_syntax::ast::NameOwner;
use crate::completion::{
@ -22,7 +22,7 @@ impl Completions {
field.name(ctx.db).to_string(),
)
.kind(CompletionItemKind::Field)
.detail(field.ty(ctx.db).subst(substs).to_string())
.detail(field.ty(ctx.db).subst(substs).display(ctx.db).to_string())
.set_documentation(field.docs(ctx.db))
.add_to(self);
}
@ -30,7 +30,7 @@ impl Completions {
pub(crate) fn add_pos_field(&mut self, ctx: &CompletionContext, field: usize, ty: &hir::Ty) {
CompletionItem::new(CompletionKind::Reference, ctx.source_range(), field.to_string())
.kind(CompletionItemKind::Field)
.detail(ty.to_string())
.detail(ty.display(ctx.db).to_string())
.add_to(self);
}
@ -154,7 +154,10 @@ impl Completions {
None => return,
};
let detail_types = variant.fields(ctx.db).into_iter().map(|field| field.ty(ctx.db));
let detail = join(detail_types).separator(", ").surround_with("(", ")").to_string();
let detail = join(detail_types.map(|t| t.display(ctx.db).to_string()))
.separator(", ")
.surround_with("(", ")")
.to_string();
CompletionItem::new(CompletionKind::Reference, ctx.source_range(), name.to_string())
.kind(CompletionItemKind::EnumVariant)

5
crates/ra_ide_api/src/hover.rs
View File

@ -3,6 +3,7 @@ use ra_syntax::{
AstNode, SyntaxNode, TreeArc, ast::{self, NameOwner, VisibilityOwner, TypeAscriptionOwner},
algo::{find_covering_node, find_node_at_offset, find_leaf_at_offset, visit::{visitor, Visitor}},
};
use hir::HirDisplay;
use crate::{db::RootDatabase, RangeInfo, FilePosition, FileRange, NavigationTarget};
@ -134,9 +135,9 @@ pub(crate) fn type_of(db: &RootDatabase, frange: FileRange) -> Option<String> {
let infer = function.infer(db);
let source_map = function.body_source_map(db);
if let Some(expr) = ast::Expr::cast(node).and_then(|e| source_map.node_expr(e)) {
Some(infer[expr].to_string())
Some(infer[expr].display(db).to_string())
} else if let Some(pat) = ast::Pat::cast(node).and_then(|p| source_map.node_pat(p)) {
Some(infer[pat].to_string())
Some(infer[pat].display(db).to_string())
} else {
None
}