1235 lines
47 KiB
Rust
1235 lines
47 KiB
Rust
//! The `HirDisplay` trait, which serves two purposes: Turning various bits from
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//! HIR back into source code, and just displaying them for debugging/testing
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//! purposes.
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use std::fmt::{self, Debug};
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use base_db::CrateId;
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use chalk_ir::BoundVar;
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use hir_def::{
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body,
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db::DefDatabase,
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find_path,
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generics::TypeParamProvenance,
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intern::{Internable, Interned},
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item_scope::ItemInNs,
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path::{Path, PathKind},
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type_ref::{TraitBoundModifier, TypeBound, TypeRef},
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visibility::Visibility,
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HasModule, ItemContainerId, Lookup, ModuleId, TraitId,
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};
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use hir_expand::{hygiene::Hygiene, name::Name};
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use itertools::Itertools;
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use crate::{
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const_from_placeholder_idx,
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db::HirDatabase,
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from_assoc_type_id, from_foreign_def_id, from_placeholder_idx, lt_from_placeholder_idx,
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mapping::from_chalk,
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primitive, subst_prefix, to_assoc_type_id,
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utils::{self, generics},
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AdtId, AliasEq, AliasTy, CallableDefId, CallableSig, Const, ConstValue, DomainGoal, GenericArg,
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ImplTraitId, Interner, Lifetime, LifetimeData, LifetimeOutlives, Mutability, OpaqueTy,
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ProjectionTy, ProjectionTyExt, QuantifiedWhereClause, Scalar, TraitRef, TraitRefExt, Ty, TyExt,
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TyKind, WhereClause,
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};
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pub struct HirFormatter<'a> {
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pub db: &'a dyn HirDatabase,
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fmt: &'a mut dyn fmt::Write,
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buf: String,
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curr_size: usize,
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pub(crate) max_size: Option<usize>,
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omit_verbose_types: bool,
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display_target: DisplayTarget,
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}
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pub trait HirDisplay {
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fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError>;
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/// Returns a `Display`able type that is human-readable.
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fn into_displayable<'a>(
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&'a self,
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db: &'a dyn HirDatabase,
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max_size: Option<usize>,
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omit_verbose_types: bool,
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display_target: DisplayTarget,
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) -> HirDisplayWrapper<'a, Self>
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where
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Self: Sized,
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{
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assert!(
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!matches!(display_target, DisplayTarget::SourceCode { .. }),
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"HirDisplayWrapper cannot fail with DisplaySourceCodeError, use HirDisplay::hir_fmt directly instead"
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);
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HirDisplayWrapper { db, t: self, max_size, omit_verbose_types, display_target }
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}
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/// Returns a `Display`able type that is human-readable.
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/// Use this for showing types to the user (e.g. diagnostics)
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fn display<'a>(&'a self, db: &'a dyn HirDatabase) -> HirDisplayWrapper<'a, Self>
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where
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Self: Sized,
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{
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HirDisplayWrapper {
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db,
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t: self,
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max_size: None,
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omit_verbose_types: false,
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display_target: DisplayTarget::Diagnostics,
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}
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}
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/// Returns a `Display`able type that is human-readable and tries to be succinct.
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/// Use this for showing types to the user where space is constrained (e.g. doc popups)
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fn display_truncated<'a>(
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&'a self,
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db: &'a dyn HirDatabase,
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max_size: Option<usize>,
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) -> HirDisplayWrapper<'a, Self>
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where
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Self: Sized,
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{
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HirDisplayWrapper {
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db,
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t: self,
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max_size,
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omit_verbose_types: true,
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display_target: DisplayTarget::Diagnostics,
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}
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}
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/// Returns a String representation of `self` that can be inserted into the given module.
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/// Use this when generating code (e.g. assists)
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fn display_source_code<'a>(
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&'a self,
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db: &'a dyn HirDatabase,
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module_id: ModuleId,
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) -> Result<String, DisplaySourceCodeError> {
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let mut result = String::new();
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match self.hir_fmt(&mut HirFormatter {
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db,
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fmt: &mut result,
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buf: String::with_capacity(20),
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curr_size: 0,
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max_size: None,
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omit_verbose_types: false,
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display_target: DisplayTarget::SourceCode { module_id },
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}) {
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Ok(()) => {}
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Err(HirDisplayError::FmtError) => panic!("Writing to String can't fail!"),
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Err(HirDisplayError::DisplaySourceCodeError(e)) => return Err(e),
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};
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Ok(result)
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}
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/// Returns a String representation of `self` for test purposes
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fn display_test<'a>(&'a self, db: &'a dyn HirDatabase) -> HirDisplayWrapper<'a, Self>
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where
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Self: Sized,
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{
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HirDisplayWrapper {
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db,
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t: self,
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max_size: None,
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omit_verbose_types: false,
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display_target: DisplayTarget::Test,
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}
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}
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}
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impl<'a> HirFormatter<'a> {
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pub fn write_joined<T: HirDisplay>(
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&mut self,
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iter: impl IntoIterator<Item = T>,
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sep: &str,
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) -> Result<(), HirDisplayError> {
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let mut first = true;
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for e in iter {
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if !first {
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write!(self, "{}", sep)?;
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}
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first = false;
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e.hir_fmt(self)?;
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}
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Ok(())
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}
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/// This allows using the `write!` macro directly with a `HirFormatter`.
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pub fn write_fmt(&mut self, args: fmt::Arguments) -> Result<(), HirDisplayError> {
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// We write to a buffer first to track output size
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self.buf.clear();
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fmt::write(&mut self.buf, args)?;
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self.curr_size += self.buf.len();
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// Then we write to the internal formatter from the buffer
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self.fmt.write_str(&self.buf).map_err(HirDisplayError::from)
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}
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pub fn should_truncate(&self) -> bool {
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match self.max_size {
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Some(max_size) => self.curr_size >= max_size,
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None => false,
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}
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}
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pub fn omit_verbose_types(&self) -> bool {
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self.omit_verbose_types
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}
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}
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#[derive(Clone, Copy)]
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pub enum DisplayTarget {
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/// Display types for inlays, doc popups, autocompletion, etc...
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/// Showing `{unknown}` or not qualifying paths is fine here.
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/// There's no reason for this to fail.
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Diagnostics,
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/// Display types for inserting them in source files.
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/// The generated code should compile, so paths need to be qualified.
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SourceCode { module_id: ModuleId },
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/// Only for test purpose to keep real types
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Test,
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}
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impl DisplayTarget {
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fn is_source_code(&self) -> bool {
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matches!(self, Self::SourceCode { .. })
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}
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fn is_test(&self) -> bool {
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matches!(self, Self::Test)
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}
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}
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#[derive(Debug)]
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pub enum DisplaySourceCodeError {
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PathNotFound,
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UnknownType,
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Closure,
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}
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pub enum HirDisplayError {
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/// Errors that can occur when generating source code
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DisplaySourceCodeError(DisplaySourceCodeError),
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/// `FmtError` is required to be compatible with std::fmt::Display
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FmtError,
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}
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impl From<fmt::Error> for HirDisplayError {
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fn from(_: fmt::Error) -> Self {
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Self::FmtError
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}
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}
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pub struct HirDisplayWrapper<'a, T> {
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db: &'a dyn HirDatabase,
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t: &'a T,
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max_size: Option<usize>,
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omit_verbose_types: bool,
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display_target: DisplayTarget,
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}
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impl<'a, T> fmt::Display for HirDisplayWrapper<'a, T>
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where
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T: HirDisplay,
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{
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self.t.hir_fmt(&mut HirFormatter {
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db: self.db,
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fmt: f,
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buf: String::with_capacity(20),
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curr_size: 0,
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max_size: self.max_size,
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omit_verbose_types: self.omit_verbose_types,
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display_target: self.display_target,
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}) {
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Ok(()) => Ok(()),
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Err(HirDisplayError::FmtError) => Err(fmt::Error),
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Err(HirDisplayError::DisplaySourceCodeError(_)) => {
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// This should never happen
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panic!("HirDisplay::hir_fmt failed with DisplaySourceCodeError when calling Display::fmt!")
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}
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}
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}
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}
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const TYPE_HINT_TRUNCATION: &str = "…";
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impl<T: HirDisplay> HirDisplay for &'_ T {
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fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
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HirDisplay::hir_fmt(*self, f)
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}
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}
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impl<T: HirDisplay + Internable> HirDisplay for Interned<T> {
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fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
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HirDisplay::hir_fmt(self.as_ref(), f)
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}
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}
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impl HirDisplay for ProjectionTy {
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fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
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if f.should_truncate() {
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return write!(f, "{}", TYPE_HINT_TRUNCATION);
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}
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let trait_ = f.db.trait_data(self.trait_(f.db));
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write!(f, "<")?;
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self.self_type_parameter(&Interner).hir_fmt(f)?;
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write!(f, " as {}", trait_.name)?;
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if self.substitution.len(&Interner) > 1 {
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write!(f, "<")?;
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f.write_joined(&self.substitution.as_slice(&Interner)[1..], ", ")?;
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write!(f, ">")?;
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}
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write!(f, ">::{}", f.db.type_alias_data(from_assoc_type_id(self.associated_ty_id)).name)?;
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Ok(())
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}
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}
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impl HirDisplay for OpaqueTy {
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fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
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if f.should_truncate() {
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return write!(f, "{}", TYPE_HINT_TRUNCATION);
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}
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self.substitution.at(&Interner, 0).hir_fmt(f)
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}
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}
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impl HirDisplay for GenericArg {
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fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
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match self.interned() {
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crate::GenericArgData::Ty(ty) => ty.hir_fmt(f),
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crate::GenericArgData::Lifetime(lt) => lt.hir_fmt(f),
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crate::GenericArgData::Const(c) => c.hir_fmt(f),
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}
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}
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}
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impl HirDisplay for Const {
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fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
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let data = self.interned();
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match data.value {
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ConstValue::BoundVar(idx) => idx.hir_fmt(f),
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ConstValue::InferenceVar(..) => write!(f, "_"),
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ConstValue::Placeholder(idx) => {
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let id = const_from_placeholder_idx(f.db, idx);
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let generics = generics(f.db.upcast(), id.parent);
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let param_data = &generics.params.consts[id.local_id];
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write!(f, "{}", param_data.name)
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}
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ConstValue::Concrete(c) => write!(f, "{}", c.interned),
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}
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}
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}
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impl HirDisplay for BoundVar {
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fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
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write!(f, "?{}.{}", self.debruijn.depth(), self.index)
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}
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}
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impl HirDisplay for Ty {
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fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
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if f.should_truncate() {
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return write!(f, "{}", TYPE_HINT_TRUNCATION);
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}
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match self.kind(&Interner) {
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TyKind::Never => write!(f, "!")?,
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TyKind::Str => write!(f, "str")?,
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TyKind::Scalar(Scalar::Bool) => write!(f, "bool")?,
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TyKind::Scalar(Scalar::Char) => write!(f, "char")?,
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&TyKind::Scalar(Scalar::Float(t)) => write!(f, "{}", primitive::float_ty_to_string(t))?,
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&TyKind::Scalar(Scalar::Int(t)) => write!(f, "{}", primitive::int_ty_to_string(t))?,
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&TyKind::Scalar(Scalar::Uint(t)) => write!(f, "{}", primitive::uint_ty_to_string(t))?,
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TyKind::Slice(t) => {
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write!(f, "[")?;
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t.hir_fmt(f)?;
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write!(f, "]")?;
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}
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TyKind::Array(t, c) => {
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write!(f, "[")?;
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t.hir_fmt(f)?;
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write!(f, "; ")?;
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c.hir_fmt(f)?;
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write!(f, "]")?;
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}
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TyKind::Raw(m, t) | TyKind::Ref(m, _, t) => {
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if matches!(self.kind(&Interner), TyKind::Raw(..)) {
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write!(
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f,
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"*{}",
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match m {
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Mutability::Not => "const ",
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Mutability::Mut => "mut ",
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}
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)?;
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} else {
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write!(
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f,
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"&{}",
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match m {
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Mutability::Not => "",
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Mutability::Mut => "mut ",
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}
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)?;
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}
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// FIXME: all this just to decide whether to use parentheses...
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let contains_impl_fn = |bounds: &[QuantifiedWhereClause]| {
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bounds.iter().any(|bound| {
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if let WhereClause::Implemented(trait_ref) = bound.skip_binders() {
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let trait_ = trait_ref.hir_trait_id();
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fn_traits(f.db.upcast(), trait_).any(|it| it == trait_)
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} else {
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false
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}
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})
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};
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let (preds_to_print, has_impl_fn_pred) = match t.kind(&Interner) {
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TyKind::Dyn(dyn_ty) if dyn_ty.bounds.skip_binders().interned().len() > 1 => {
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let bounds = dyn_ty.bounds.skip_binders().interned();
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(bounds.len(), contains_impl_fn(bounds))
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}
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TyKind::Alias(AliasTy::Opaque(OpaqueTy {
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opaque_ty_id,
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substitution: parameters,
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}))
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| TyKind::OpaqueType(opaque_ty_id, parameters) => {
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let impl_trait_id =
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f.db.lookup_intern_impl_trait_id((*opaque_ty_id).into());
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if let ImplTraitId::ReturnTypeImplTrait(func, idx) = impl_trait_id {
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let datas =
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f.db.return_type_impl_traits(func)
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.expect("impl trait id without data");
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let data = (*datas)
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.as_ref()
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.map(|rpit| rpit.impl_traits[idx as usize].bounds.clone());
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let bounds = data.substitute(&Interner, parameters);
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let mut len = bounds.skip_binders().len();
|
|
|
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// Don't count Sized but count when it absent
|
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// (i.e. when explicit ?Sized bound is set).
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let default_sized = SizedByDefault::Sized {
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anchor: func.lookup(f.db.upcast()).module(f.db.upcast()).krate(),
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};
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let sized_bounds = bounds
|
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.skip_binders()
|
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.iter()
|
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.filter(|b| {
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matches!(
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b.skip_binders(),
|
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WhereClause::Implemented(trait_ref)
|
|
if default_sized.is_sized_trait(
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trait_ref.hir_trait_id(),
|
|
f.db.upcast(),
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),
|
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)
|
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})
|
|
.count();
|
|
match sized_bounds {
|
|
0 => len += 1,
|
|
_ => {
|
|
len = len.saturating_sub(sized_bounds);
|
|
}
|
|
}
|
|
|
|
(len, contains_impl_fn(bounds.skip_binders()))
|
|
} else {
|
|
(0, false)
|
|
}
|
|
}
|
|
_ => (0, false),
|
|
};
|
|
|
|
if has_impl_fn_pred && preds_to_print <= 2 {
|
|
return t.hir_fmt(f);
|
|
}
|
|
|
|
if preds_to_print > 1 {
|
|
write!(f, "(")?;
|
|
t.hir_fmt(f)?;
|
|
write!(f, ")")?;
|
|
} else {
|
|
t.hir_fmt(f)?;
|
|
}
|
|
}
|
|
TyKind::Tuple(_, substs) => {
|
|
if substs.len(&Interner) == 1 {
|
|
write!(f, "(")?;
|
|
substs.at(&Interner, 0).hir_fmt(f)?;
|
|
write!(f, ",)")?;
|
|
} else {
|
|
write!(f, "(")?;
|
|
f.write_joined(&*substs.as_slice(&Interner), ", ")?;
|
|
write!(f, ")")?;
|
|
}
|
|
}
|
|
TyKind::Function(fn_ptr) => {
|
|
let sig = CallableSig::from_fn_ptr(fn_ptr);
|
|
sig.hir_fmt(f)?;
|
|
}
|
|
TyKind::FnDef(def, parameters) => {
|
|
let def = from_chalk(f.db, *def);
|
|
let sig = f.db.callable_item_signature(def).substitute(&Interner, parameters);
|
|
match def {
|
|
CallableDefId::FunctionId(ff) => {
|
|
write!(f, "fn {}", f.db.function_data(ff).name)?
|
|
}
|
|
CallableDefId::StructId(s) => write!(f, "{}", f.db.struct_data(s).name)?,
|
|
CallableDefId::EnumVariantId(e) => {
|
|
write!(f, "{}", f.db.enum_data(e.parent).variants[e.local_id].name)?
|
|
}
|
|
};
|
|
if parameters.len(&Interner) > 0 {
|
|
let generics = generics(f.db.upcast(), def.into());
|
|
let (parent_params, self_param, type_params, _impl_trait_params) =
|
|
generics.provenance_split();
|
|
let total_len = parent_params + self_param + type_params;
|
|
// We print all params except implicit impl Trait params. Still a bit weird; should we leave out parent and self?
|
|
if total_len > 0 {
|
|
write!(f, "<")?;
|
|
f.write_joined(¶meters.as_slice(&Interner)[..total_len], ", ")?;
|
|
write!(f, ">")?;
|
|
}
|
|
}
|
|
write!(f, "(")?;
|
|
f.write_joined(sig.params(), ", ")?;
|
|
write!(f, ")")?;
|
|
let ret = sig.ret();
|
|
if !ret.is_unit() {
|
|
write!(f, " -> ")?;
|
|
ret.hir_fmt(f)?;
|
|
}
|
|
}
|
|
TyKind::Adt(AdtId(def_id), parameters) => {
|
|
match f.display_target {
|
|
DisplayTarget::Diagnostics | DisplayTarget::Test => {
|
|
let name = match *def_id {
|
|
hir_def::AdtId::StructId(it) => f.db.struct_data(it).name.clone(),
|
|
hir_def::AdtId::UnionId(it) => f.db.union_data(it).name.clone(),
|
|
hir_def::AdtId::EnumId(it) => f.db.enum_data(it).name.clone(),
|
|
};
|
|
write!(f, "{}", name)?;
|
|
}
|
|
DisplayTarget::SourceCode { module_id } => {
|
|
if let Some(path) = find_path::find_path(
|
|
f.db.upcast(),
|
|
ItemInNs::Types((*def_id).into()),
|
|
module_id,
|
|
) {
|
|
write!(f, "{}", path)?;
|
|
} else {
|
|
return Err(HirDisplayError::DisplaySourceCodeError(
|
|
DisplaySourceCodeError::PathNotFound,
|
|
));
|
|
}
|
|
}
|
|
}
|
|
|
|
if parameters.len(&Interner) > 0 {
|
|
let parameters_to_write = if f.display_target.is_source_code()
|
|
|| f.omit_verbose_types()
|
|
{
|
|
match self
|
|
.as_generic_def(f.db)
|
|
.map(|generic_def_id| f.db.generic_defaults(generic_def_id))
|
|
.filter(|defaults| !defaults.is_empty())
|
|
{
|
|
None => parameters.as_slice(&Interner),
|
|
Some(default_parameters) => {
|
|
let mut default_from = 0;
|
|
for (i, parameter) in parameters.iter(&Interner).enumerate() {
|
|
match (
|
|
parameter.assert_ty_ref(&Interner).kind(&Interner),
|
|
default_parameters.get(i),
|
|
) {
|
|
(&TyKind::Error, _) | (_, None) => {
|
|
default_from = i + 1;
|
|
}
|
|
(_, Some(default_parameter)) => {
|
|
let actual_default =
|
|
default_parameter.clone().substitute(
|
|
&Interner,
|
|
&subst_prefix(parameters, i),
|
|
);
|
|
if parameter.assert_ty_ref(&Interner) != &actual_default
|
|
{
|
|
default_from = i + 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
¶meters.as_slice(&Interner)[0..default_from]
|
|
}
|
|
}
|
|
} else {
|
|
parameters.as_slice(&Interner)
|
|
};
|
|
if !parameters_to_write.is_empty() {
|
|
write!(f, "<")?;
|
|
f.write_joined(parameters_to_write, ", ")?;
|
|
write!(f, ">")?;
|
|
}
|
|
}
|
|
}
|
|
TyKind::AssociatedType(assoc_type_id, parameters) => {
|
|
let type_alias = from_assoc_type_id(*assoc_type_id);
|
|
let trait_ = match type_alias.lookup(f.db.upcast()).container {
|
|
ItemContainerId::TraitId(it) => it,
|
|
_ => panic!("not an associated type"),
|
|
};
|
|
let trait_ = f.db.trait_data(trait_);
|
|
let type_alias_data = f.db.type_alias_data(type_alias);
|
|
|
|
// Use placeholder associated types when the target is test (https://rust-lang.github.io/chalk/book/clauses/type_equality.html#placeholder-associated-types)
|
|
if f.display_target.is_test() {
|
|
write!(f, "{}::{}", trait_.name, type_alias_data.name)?;
|
|
if parameters.len(&Interner) > 0 {
|
|
write!(f, "<")?;
|
|
f.write_joined(&*parameters.as_slice(&Interner), ", ")?;
|
|
write!(f, ">")?;
|
|
}
|
|
} else {
|
|
let projection_ty = ProjectionTy {
|
|
associated_ty_id: to_assoc_type_id(type_alias),
|
|
substitution: parameters.clone(),
|
|
};
|
|
|
|
projection_ty.hir_fmt(f)?;
|
|
}
|
|
}
|
|
TyKind::Foreign(type_alias) => {
|
|
let type_alias = f.db.type_alias_data(from_foreign_def_id(*type_alias));
|
|
write!(f, "{}", type_alias.name)?;
|
|
}
|
|
TyKind::OpaqueType(opaque_ty_id, parameters) => {
|
|
let impl_trait_id = f.db.lookup_intern_impl_trait_id((*opaque_ty_id).into());
|
|
match impl_trait_id {
|
|
ImplTraitId::ReturnTypeImplTrait(func, idx) => {
|
|
let datas =
|
|
f.db.return_type_impl_traits(func).expect("impl trait id without data");
|
|
let data = (*datas)
|
|
.as_ref()
|
|
.map(|rpit| rpit.impl_traits[idx as usize].bounds.clone());
|
|
let bounds = data.substitute(&Interner, ¶meters);
|
|
let krate = func.lookup(f.db.upcast()).module(f.db.upcast()).krate();
|
|
write_bounds_like_dyn_trait_with_prefix(
|
|
"impl",
|
|
bounds.skip_binders(),
|
|
SizedByDefault::Sized { anchor: krate },
|
|
f,
|
|
)?;
|
|
// FIXME: it would maybe be good to distinguish this from the alias type (when debug printing), and to show the substitution
|
|
}
|
|
ImplTraitId::AsyncBlockTypeImplTrait(..) => {
|
|
write!(f, "impl Future<Output = ")?;
|
|
parameters.at(&Interner, 0).hir_fmt(f)?;
|
|
write!(f, ">")?;
|
|
}
|
|
}
|
|
}
|
|
TyKind::Closure(.., substs) => {
|
|
if f.display_target.is_source_code() {
|
|
return Err(HirDisplayError::DisplaySourceCodeError(
|
|
DisplaySourceCodeError::Closure,
|
|
));
|
|
}
|
|
let sig = substs.at(&Interner, 0).assert_ty_ref(&Interner).callable_sig(f.db);
|
|
if let Some(sig) = sig {
|
|
if sig.params().is_empty() {
|
|
write!(f, "||")?;
|
|
} else if f.should_truncate() {
|
|
write!(f, "|{}|", TYPE_HINT_TRUNCATION)?;
|
|
} else {
|
|
write!(f, "|")?;
|
|
f.write_joined(sig.params(), ", ")?;
|
|
write!(f, "|")?;
|
|
};
|
|
|
|
write!(f, " -> ")?;
|
|
sig.ret().hir_fmt(f)?;
|
|
} else {
|
|
write!(f, "{{closure}}")?;
|
|
}
|
|
}
|
|
TyKind::Placeholder(idx) => {
|
|
let id = from_placeholder_idx(f.db, *idx);
|
|
let generics = generics(f.db.upcast(), id.parent);
|
|
let param_data = &generics.params.types[id.local_id];
|
|
match param_data.provenance {
|
|
TypeParamProvenance::TypeParamList | TypeParamProvenance::TraitSelf => {
|
|
write!(f, "{}", param_data.name.clone().unwrap_or_else(Name::missing))?
|
|
}
|
|
TypeParamProvenance::ArgumentImplTrait => {
|
|
let substs = generics.type_params_subst(f.db);
|
|
let bounds =
|
|
f.db.generic_predicates(id.parent)
|
|
.iter()
|
|
.map(|pred| pred.clone().substitute(&Interner, &substs))
|
|
.filter(|wc| match &wc.skip_binders() {
|
|
WhereClause::Implemented(tr) => {
|
|
&tr.self_type_parameter(&Interner) == self
|
|
}
|
|
WhereClause::AliasEq(AliasEq {
|
|
alias: AliasTy::Projection(proj),
|
|
ty: _,
|
|
}) => &proj.self_type_parameter(&Interner) == self,
|
|
_ => false,
|
|
})
|
|
.collect::<Vec<_>>();
|
|
let krate = id.parent.module(f.db.upcast()).krate();
|
|
write_bounds_like_dyn_trait_with_prefix(
|
|
"impl",
|
|
&bounds,
|
|
SizedByDefault::Sized { anchor: krate },
|
|
f,
|
|
)?;
|
|
}
|
|
}
|
|
}
|
|
TyKind::BoundVar(idx) => idx.hir_fmt(f)?,
|
|
TyKind::Dyn(dyn_ty) => {
|
|
write_bounds_like_dyn_trait_with_prefix(
|
|
"dyn",
|
|
dyn_ty.bounds.skip_binders().interned(),
|
|
SizedByDefault::NotSized,
|
|
f,
|
|
)?;
|
|
}
|
|
TyKind::Alias(AliasTy::Projection(p_ty)) => p_ty.hir_fmt(f)?,
|
|
TyKind::Alias(AliasTy::Opaque(opaque_ty)) => {
|
|
let impl_trait_id = f.db.lookup_intern_impl_trait_id(opaque_ty.opaque_ty_id.into());
|
|
match impl_trait_id {
|
|
ImplTraitId::ReturnTypeImplTrait(func, idx) => {
|
|
let datas =
|
|
f.db.return_type_impl_traits(func).expect("impl trait id without data");
|
|
let data = (*datas)
|
|
.as_ref()
|
|
.map(|rpit| rpit.impl_traits[idx as usize].bounds.clone());
|
|
let bounds = data.substitute(&Interner, &opaque_ty.substitution);
|
|
let krate = func.lookup(f.db.upcast()).module(f.db.upcast()).krate();
|
|
write_bounds_like_dyn_trait_with_prefix(
|
|
"impl",
|
|
bounds.skip_binders(),
|
|
SizedByDefault::Sized { anchor: krate },
|
|
f,
|
|
)?;
|
|
}
|
|
ImplTraitId::AsyncBlockTypeImplTrait(..) => {
|
|
write!(f, "{{async block}}")?;
|
|
}
|
|
};
|
|
}
|
|
TyKind::Error => {
|
|
if f.display_target.is_source_code() {
|
|
return Err(HirDisplayError::DisplaySourceCodeError(
|
|
DisplaySourceCodeError::UnknownType,
|
|
));
|
|
}
|
|
write!(f, "{{unknown}}")?;
|
|
}
|
|
TyKind::InferenceVar(..) => write!(f, "_")?,
|
|
TyKind::Generator(..) => write!(f, "{{generator}}")?,
|
|
TyKind::GeneratorWitness(..) => write!(f, "{{generator witness}}")?,
|
|
}
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
impl HirDisplay for CallableSig {
|
|
fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
|
|
write!(f, "fn(")?;
|
|
f.write_joined(self.params(), ", ")?;
|
|
if self.is_varargs {
|
|
if self.params().is_empty() {
|
|
write!(f, "...")?;
|
|
} else {
|
|
write!(f, ", ...")?;
|
|
}
|
|
}
|
|
write!(f, ")")?;
|
|
let ret = self.ret();
|
|
if !ret.is_unit() {
|
|
write!(f, " -> ")?;
|
|
ret.hir_fmt(f)?;
|
|
}
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
fn fn_traits(db: &dyn DefDatabase, trait_: TraitId) -> impl Iterator<Item = TraitId> {
|
|
let krate = trait_.lookup(db).container.krate();
|
|
utils::fn_traits(db, krate)
|
|
}
|
|
|
|
#[derive(Clone, Copy, PartialEq, Eq)]
|
|
pub enum SizedByDefault {
|
|
NotSized,
|
|
Sized { anchor: CrateId },
|
|
}
|
|
|
|
impl SizedByDefault {
|
|
fn is_sized_trait(self, trait_: TraitId, db: &dyn DefDatabase) -> bool {
|
|
match self {
|
|
Self::NotSized => false,
|
|
Self::Sized { anchor } => {
|
|
let sized_trait =
|
|
db.lang_item(anchor, "sized".into()).and_then(|lang_item| lang_item.as_trait());
|
|
Some(trait_) == sized_trait
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn write_bounds_like_dyn_trait_with_prefix(
|
|
prefix: &str,
|
|
predicates: &[QuantifiedWhereClause],
|
|
default_sized: SizedByDefault,
|
|
f: &mut HirFormatter,
|
|
) -> Result<(), HirDisplayError> {
|
|
write!(f, "{}", prefix)?;
|
|
if !predicates.is_empty()
|
|
|| predicates.is_empty() && matches!(default_sized, SizedByDefault::Sized { .. })
|
|
{
|
|
write!(f, " ")?;
|
|
write_bounds_like_dyn_trait(predicates, default_sized, f)
|
|
} else {
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
fn write_bounds_like_dyn_trait(
|
|
predicates: &[QuantifiedWhereClause],
|
|
default_sized: SizedByDefault,
|
|
f: &mut HirFormatter,
|
|
) -> Result<(), HirDisplayError> {
|
|
// Note: This code is written to produce nice results (i.e.
|
|
// corresponding to surface Rust) for types that can occur in
|
|
// actual Rust. It will have weird results if the predicates
|
|
// aren't as expected (i.e. self types = $0, projection
|
|
// predicates for a certain trait come after the Implemented
|
|
// predicate for that trait).
|
|
let mut first = true;
|
|
let mut angle_open = false;
|
|
let mut is_fn_trait = false;
|
|
let mut is_sized = false;
|
|
for p in predicates.iter() {
|
|
match p.skip_binders() {
|
|
WhereClause::Implemented(trait_ref) => {
|
|
let trait_ = trait_ref.hir_trait_id();
|
|
if default_sized.is_sized_trait(trait_, f.db.upcast()) {
|
|
is_sized = true;
|
|
if matches!(default_sized, SizedByDefault::Sized { .. }) {
|
|
// Don't print +Sized, but rather +?Sized if absent.
|
|
continue;
|
|
}
|
|
}
|
|
if !is_fn_trait {
|
|
is_fn_trait = fn_traits(f.db.upcast(), trait_).any(|it| it == trait_);
|
|
}
|
|
if !is_fn_trait && angle_open {
|
|
write!(f, ">")?;
|
|
angle_open = false;
|
|
}
|
|
if !first {
|
|
write!(f, " + ")?;
|
|
}
|
|
// We assume that the self type is ^0.0 (i.e. the
|
|
// existential) here, which is the only thing that's
|
|
// possible in actual Rust, and hence don't print it
|
|
write!(f, "{}", f.db.trait_data(trait_).name)?;
|
|
if let [_, params @ ..] = &*trait_ref.substitution.as_slice(&Interner) {
|
|
if is_fn_trait {
|
|
if let Some(args) =
|
|
params.first().and_then(|it| it.assert_ty_ref(&Interner).as_tuple())
|
|
{
|
|
write!(f, "(")?;
|
|
f.write_joined(args.as_slice(&Interner), ", ")?;
|
|
write!(f, ")")?;
|
|
}
|
|
} else if !params.is_empty() {
|
|
write!(f, "<")?;
|
|
f.write_joined(params, ", ")?;
|
|
// there might be assoc type bindings, so we leave the angle brackets open
|
|
angle_open = true;
|
|
}
|
|
}
|
|
}
|
|
WhereClause::AliasEq(alias_eq) if is_fn_trait => {
|
|
is_fn_trait = false;
|
|
if !alias_eq.ty.is_unit() {
|
|
write!(f, " -> ")?;
|
|
alias_eq.ty.hir_fmt(f)?;
|
|
}
|
|
}
|
|
WhereClause::AliasEq(AliasEq { ty, alias }) => {
|
|
// in types in actual Rust, these will always come
|
|
// after the corresponding Implemented predicate
|
|
if angle_open {
|
|
write!(f, ", ")?;
|
|
} else {
|
|
write!(f, "<")?;
|
|
angle_open = true;
|
|
}
|
|
if let AliasTy::Projection(proj) = alias {
|
|
let type_alias =
|
|
f.db.type_alias_data(from_assoc_type_id(proj.associated_ty_id));
|
|
write!(f, "{} = ", type_alias.name)?;
|
|
}
|
|
ty.hir_fmt(f)?;
|
|
}
|
|
|
|
// FIXME implement these
|
|
WhereClause::LifetimeOutlives(_) => {}
|
|
WhereClause::TypeOutlives(_) => {}
|
|
}
|
|
first = false;
|
|
}
|
|
if angle_open {
|
|
write!(f, ">")?;
|
|
}
|
|
if matches!(default_sized, SizedByDefault::Sized { .. }) {
|
|
if !is_sized {
|
|
write!(f, "{}?Sized", if first { "" } else { " + " })?;
|
|
} else if first {
|
|
write!(f, "Sized")?;
|
|
}
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
fn fmt_trait_ref(tr: &TraitRef, f: &mut HirFormatter, use_as: bool) -> Result<(), HirDisplayError> {
|
|
if f.should_truncate() {
|
|
return write!(f, "{}", TYPE_HINT_TRUNCATION);
|
|
}
|
|
|
|
tr.self_type_parameter(&Interner).hir_fmt(f)?;
|
|
if use_as {
|
|
write!(f, " as ")?;
|
|
} else {
|
|
write!(f, ": ")?;
|
|
}
|
|
write!(f, "{}", f.db.trait_data(tr.hir_trait_id()).name)?;
|
|
if tr.substitution.len(&Interner) > 1 {
|
|
write!(f, "<")?;
|
|
f.write_joined(&tr.substitution.as_slice(&Interner)[1..], ", ")?;
|
|
write!(f, ">")?;
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
impl HirDisplay for TraitRef {
|
|
fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
|
|
fmt_trait_ref(self, f, false)
|
|
}
|
|
}
|
|
|
|
impl HirDisplay for WhereClause {
|
|
fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
|
|
if f.should_truncate() {
|
|
return write!(f, "{}", TYPE_HINT_TRUNCATION);
|
|
}
|
|
|
|
match self {
|
|
WhereClause::Implemented(trait_ref) => trait_ref.hir_fmt(f)?,
|
|
WhereClause::AliasEq(AliasEq { alias: AliasTy::Projection(projection_ty), ty }) => {
|
|
write!(f, "<")?;
|
|
fmt_trait_ref(&projection_ty.trait_ref(f.db), f, true)?;
|
|
write!(
|
|
f,
|
|
">::{} = ",
|
|
f.db.type_alias_data(from_assoc_type_id(projection_ty.associated_ty_id)).name,
|
|
)?;
|
|
ty.hir_fmt(f)?;
|
|
}
|
|
WhereClause::AliasEq(_) => write!(f, "{{error}}")?,
|
|
|
|
// FIXME implement these
|
|
WhereClause::TypeOutlives(..) => {}
|
|
WhereClause::LifetimeOutlives(..) => {}
|
|
}
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
impl HirDisplay for LifetimeOutlives {
|
|
fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
|
|
self.a.hir_fmt(f)?;
|
|
write!(f, ": ")?;
|
|
self.b.hir_fmt(f)
|
|
}
|
|
}
|
|
|
|
impl HirDisplay for Lifetime {
|
|
fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
|
|
self.interned().hir_fmt(f)
|
|
}
|
|
}
|
|
|
|
impl HirDisplay for LifetimeData {
|
|
fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
|
|
match self {
|
|
LifetimeData::BoundVar(idx) => idx.hir_fmt(f),
|
|
LifetimeData::InferenceVar(_) => write!(f, "_"),
|
|
LifetimeData::Placeholder(idx) => {
|
|
let id = lt_from_placeholder_idx(f.db, *idx);
|
|
let generics = generics(f.db.upcast(), id.parent);
|
|
let param_data = &generics.params.lifetimes[id.local_id];
|
|
write!(f, "{}", param_data.name)
|
|
}
|
|
LifetimeData::Static => write!(f, "'static"),
|
|
LifetimeData::Empty(_) => Ok(()),
|
|
LifetimeData::Erased => Ok(()),
|
|
LifetimeData::Phantom(_, _) => Ok(()),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl HirDisplay for DomainGoal {
|
|
fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
|
|
match self {
|
|
DomainGoal::Holds(wc) => {
|
|
write!(f, "Holds(")?;
|
|
wc.hir_fmt(f)?;
|
|
write!(f, ")")?;
|
|
}
|
|
_ => write!(f, "?")?,
|
|
}
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
pub fn write_visibility(
|
|
module_id: ModuleId,
|
|
vis: Visibility,
|
|
f: &mut HirFormatter,
|
|
) -> Result<(), HirDisplayError> {
|
|
match vis {
|
|
Visibility::Public => write!(f, "pub "),
|
|
Visibility::Module(vis_id) => {
|
|
let def_map = module_id.def_map(f.db.upcast());
|
|
let root_module_id = def_map.module_id(def_map.root());
|
|
if vis_id == module_id {
|
|
// pub(self) or omitted
|
|
Ok(())
|
|
} else if root_module_id == vis_id {
|
|
write!(f, "pub(crate) ")
|
|
} else if module_id.containing_module(f.db.upcast()) == Some(vis_id) {
|
|
write!(f, "pub(super) ")
|
|
} else {
|
|
write!(f, "pub(in ...) ")
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
impl HirDisplay for TypeRef {
|
|
fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
|
|
match self {
|
|
TypeRef::Never => write!(f, "!")?,
|
|
TypeRef::Placeholder => write!(f, "_")?,
|
|
TypeRef::Tuple(elems) => {
|
|
write!(f, "(")?;
|
|
f.write_joined(elems, ", ")?;
|
|
if elems.len() == 1 {
|
|
write!(f, ",")?;
|
|
}
|
|
write!(f, ")")?;
|
|
}
|
|
TypeRef::Path(path) => path.hir_fmt(f)?,
|
|
TypeRef::RawPtr(inner, mutability) => {
|
|
let mutability = match mutability {
|
|
hir_def::type_ref::Mutability::Shared => "*const ",
|
|
hir_def::type_ref::Mutability::Mut => "*mut ",
|
|
};
|
|
write!(f, "{}", mutability)?;
|
|
inner.hir_fmt(f)?;
|
|
}
|
|
TypeRef::Reference(inner, lifetime, mutability) => {
|
|
let mutability = match mutability {
|
|
hir_def::type_ref::Mutability::Shared => "",
|
|
hir_def::type_ref::Mutability::Mut => "mut ",
|
|
};
|
|
write!(f, "&")?;
|
|
if let Some(lifetime) = lifetime {
|
|
write!(f, "{} ", lifetime.name)?;
|
|
}
|
|
write!(f, "{}", mutability)?;
|
|
inner.hir_fmt(f)?;
|
|
}
|
|
TypeRef::Array(inner, len) => {
|
|
write!(f, "[")?;
|
|
inner.hir_fmt(f)?;
|
|
write!(f, "; {}]", len)?;
|
|
}
|
|
TypeRef::Slice(inner) => {
|
|
write!(f, "[")?;
|
|
inner.hir_fmt(f)?;
|
|
write!(f, "]")?;
|
|
}
|
|
TypeRef::Fn(tys, is_varargs) => {
|
|
// FIXME: Function pointer qualifiers.
|
|
write!(f, "fn(")?;
|
|
f.write_joined(&tys[..tys.len() - 1], ", ")?;
|
|
if *is_varargs {
|
|
write!(f, "{}...", if tys.len() == 1 { "" } else { ", " })?;
|
|
}
|
|
write!(f, ")")?;
|
|
let ret_ty = tys.last().unwrap();
|
|
match ret_ty {
|
|
TypeRef::Tuple(tup) if tup.is_empty() => {}
|
|
_ => {
|
|
write!(f, " -> ")?;
|
|
ret_ty.hir_fmt(f)?;
|
|
}
|
|
}
|
|
}
|
|
TypeRef::ImplTrait(bounds) => {
|
|
write!(f, "impl ")?;
|
|
f.write_joined(bounds, " + ")?;
|
|
}
|
|
TypeRef::DynTrait(bounds) => {
|
|
write!(f, "dyn ")?;
|
|
f.write_joined(bounds, " + ")?;
|
|
}
|
|
TypeRef::Macro(macro_call) => {
|
|
let macro_call = macro_call.to_node(f.db.upcast());
|
|
let ctx = body::LowerCtx::with_hygiene(f.db.upcast(), &Hygiene::new_unhygienic());
|
|
match macro_call.path() {
|
|
Some(path) => match Path::from_src(path, &ctx) {
|
|
Some(path) => path.hir_fmt(f)?,
|
|
None => write!(f, "{{macro}}")?,
|
|
},
|
|
None => write!(f, "{{macro}}")?,
|
|
}
|
|
write!(f, "!(..)")?;
|
|
}
|
|
TypeRef::Error => write!(f, "{{error}}")?,
|
|
}
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
impl HirDisplay for TypeBound {
|
|
fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
|
|
match self {
|
|
TypeBound::Path(path, modifier) => {
|
|
match modifier {
|
|
TraitBoundModifier::None => (),
|
|
TraitBoundModifier::Maybe => write!(f, "?")?,
|
|
}
|
|
path.hir_fmt(f)
|
|
}
|
|
TypeBound::Lifetime(lifetime) => write!(f, "{}", lifetime.name),
|
|
TypeBound::ForLifetime(lifetimes, path) => {
|
|
write!(f, "for<{}> ", lifetimes.iter().format(", "))?;
|
|
path.hir_fmt(f)
|
|
}
|
|
TypeBound::Error => write!(f, "{{error}}"),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl HirDisplay for Path {
|
|
fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
|
|
match (self.type_anchor(), self.kind()) {
|
|
(Some(anchor), _) => {
|
|
write!(f, "<")?;
|
|
anchor.hir_fmt(f)?;
|
|
write!(f, ">")?;
|
|
}
|
|
(_, PathKind::Plain) => {}
|
|
(_, PathKind::Abs) => {}
|
|
(_, PathKind::Crate) => write!(f, "crate")?,
|
|
(_, PathKind::Super(0)) => write!(f, "self")?,
|
|
(_, PathKind::Super(n)) => {
|
|
for i in 0..*n {
|
|
if i > 0 {
|
|
write!(f, "::")?;
|
|
}
|
|
write!(f, "super")?;
|
|
}
|
|
}
|
|
(_, PathKind::DollarCrate(_)) => write!(f, "{{extern_crate}}")?,
|
|
}
|
|
|
|
for (seg_idx, segment) in self.segments().iter().enumerate() {
|
|
if !matches!(self.kind(), PathKind::Plain) || seg_idx > 0 {
|
|
write!(f, "::")?;
|
|
}
|
|
write!(f, "{}", segment.name)?;
|
|
if let Some(generic_args) = segment.args_and_bindings {
|
|
// We should be in type context, so format as `Foo<Bar>` instead of `Foo::<Bar>`.
|
|
// Do we actually format expressions?
|
|
if generic_args.desugared_from_fn {
|
|
// First argument will be a tuple, which already includes the parentheses.
|
|
// If the tuple only contains 1 item, write it manually to avoid the trailing `,`.
|
|
if let hir_def::path::GenericArg::Type(TypeRef::Tuple(v)) =
|
|
&generic_args.args[0]
|
|
{
|
|
if v.len() == 1 {
|
|
write!(f, "(")?;
|
|
v[0].hir_fmt(f)?;
|
|
write!(f, ")")?;
|
|
} else {
|
|
generic_args.args[0].hir_fmt(f)?;
|
|
}
|
|
}
|
|
if let Some(ret) = &generic_args.bindings[0].type_ref {
|
|
if !matches!(ret, TypeRef::Tuple(v) if v.is_empty()) {
|
|
write!(f, " -> ")?;
|
|
ret.hir_fmt(f)?;
|
|
}
|
|
}
|
|
return Ok(());
|
|
}
|
|
|
|
write!(f, "<")?;
|
|
let mut first = true;
|
|
for arg in &generic_args.args {
|
|
if first {
|
|
first = false;
|
|
if generic_args.has_self_type {
|
|
// FIXME: Convert to `<Ty as Trait>` form.
|
|
write!(f, "Self = ")?;
|
|
}
|
|
} else {
|
|
write!(f, ", ")?;
|
|
}
|
|
arg.hir_fmt(f)?;
|
|
}
|
|
for binding in &generic_args.bindings {
|
|
if first {
|
|
first = false;
|
|
} else {
|
|
write!(f, ", ")?;
|
|
}
|
|
write!(f, "{}", binding.name)?;
|
|
match &binding.type_ref {
|
|
Some(ty) => {
|
|
write!(f, " = ")?;
|
|
ty.hir_fmt(f)?
|
|
}
|
|
None => {
|
|
write!(f, ": ")?;
|
|
f.write_joined(&binding.bounds, " + ")?;
|
|
}
|
|
}
|
|
}
|
|
write!(f, ">")?;
|
|
}
|
|
}
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
impl HirDisplay for hir_def::path::GenericArg {
|
|
fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
|
|
match self {
|
|
hir_def::path::GenericArg::Type(ty) => ty.hir_fmt(f),
|
|
hir_def::path::GenericArg::Lifetime(lifetime) => write!(f, "{}", lifetime.name),
|
|
}
|
|
}
|
|
}
|