632 lines
23 KiB
Rust
632 lines
23 KiB
Rust
//! FIXME: write short doc here
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use std::fmt;
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use crate::{
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db::HirDatabase, utils::generics, ApplicationTy, CallableDefId, FnSig, GenericPredicate,
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Obligation, OpaqueTyId, ProjectionTy, Substs, TraitRef, Ty, TypeCtor,
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};
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use hir_def::{
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find_path, generics::TypeParamProvenance, item_scope::ItemInNs, AdtId, AssocContainerId,
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Lookup, ModuleId,
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};
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use hir_expand::name::Name;
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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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/// 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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}
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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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if let Some(max_size) = self.max_size {
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self.curr_size >= max_size
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} else {
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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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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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}
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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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}
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#[derive(Debug)]
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pub enum DisplaySourceCodeError {
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PathNotFound,
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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 failed 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 HirDisplay for &Ty {
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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 HirDisplay for ApplicationTy {
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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.ctor {
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TypeCtor::Bool => write!(f, "bool")?,
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TypeCtor::Char => write!(f, "char")?,
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TypeCtor::Int(t) => write!(f, "{}", t)?,
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TypeCtor::Float(t) => write!(f, "{}", t)?,
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TypeCtor::Str => write!(f, "str")?,
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TypeCtor::Slice => {
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let t = self.parameters.as_single();
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write!(f, "[{}]", t.display(f.db))?;
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}
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TypeCtor::Array => {
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let t = self.parameters.as_single();
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write!(f, "[{}; _]", t.display(f.db))?;
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}
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TypeCtor::RawPtr(m) => {
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let t = self.parameters.as_single();
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write!(f, "*{}{}", m.as_keyword_for_ptr(), t.display(f.db))?;
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}
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TypeCtor::Ref(m) => {
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let t = self.parameters.as_single();
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let ty_display = if f.omit_verbose_types() {
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t.display_truncated(f.db, f.max_size)
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} else {
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t.display(f.db)
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};
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write!(f, "&{}{}", m.as_keyword_for_ref(), ty_display)?;
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}
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TypeCtor::Never => write!(f, "!")?,
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TypeCtor::Tuple { .. } => {
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let ts = &self.parameters;
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if ts.len() == 1 {
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write!(f, "({},)", ts[0].display(f.db))?;
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} else {
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write!(f, "(")?;
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f.write_joined(&*ts.0, ", ")?;
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write!(f, ")")?;
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}
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}
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TypeCtor::FnPtr { is_varargs, .. } => {
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let sig = FnSig::from_fn_ptr_substs(&self.parameters, is_varargs);
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write!(f, "fn(")?;
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f.write_joined(sig.params(), ", ")?;
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if is_varargs {
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if sig.params().is_empty() {
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write!(f, "...")?;
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} else {
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write!(f, ", ...")?;
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}
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}
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write!(f, ")")?;
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let ret = sig.ret();
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if *ret != Ty::unit() {
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let ret_display = if f.omit_verbose_types() {
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ret.display_truncated(f.db, f.max_size)
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} else {
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ret.display(f.db)
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};
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write!(f, " -> {}", ret_display)?;
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}
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}
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TypeCtor::FnDef(def) => {
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let sig = f.db.callable_item_signature(def).subst(&self.parameters);
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match def {
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CallableDefId::FunctionId(ff) => {
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write!(f, "fn {}", f.db.function_data(ff).name)?
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}
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CallableDefId::StructId(s) => write!(f, "{}", f.db.struct_data(s).name)?,
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CallableDefId::EnumVariantId(e) => {
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write!(f, "{}", f.db.enum_data(e.parent).variants[e.local_id].name)?
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}
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};
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if self.parameters.len() > 0 {
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let generics = generics(f.db.upcast(), def.into());
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let (parent_params, self_param, type_params, _impl_trait_params) =
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generics.provenance_split();
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let total_len = parent_params + self_param + type_params;
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// We print all params except implicit impl Trait params. Still a bit weird; should we leave out parent and self?
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if total_len > 0 {
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write!(f, "<")?;
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f.write_joined(&self.parameters.0[..total_len], ", ")?;
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write!(f, ">")?;
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}
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}
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write!(f, "(")?;
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f.write_joined(sig.params(), ", ")?;
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write!(f, ")")?;
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let ret = sig.ret();
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if *ret != Ty::unit() {
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let ret_display = if f.omit_verbose_types() {
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ret.display_truncated(f.db, f.max_size)
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} else {
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ret.display(f.db)
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};
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write!(f, " -> {}", ret_display)?;
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}
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}
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TypeCtor::Adt(def_id) => {
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match f.display_target {
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DisplayTarget::Diagnostics => {
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let name = match def_id {
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AdtId::StructId(it) => f.db.struct_data(it).name.clone(),
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AdtId::UnionId(it) => f.db.union_data(it).name.clone(),
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AdtId::EnumId(it) => f.db.enum_data(it).name.clone(),
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};
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write!(f, "{}", name)?;
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}
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DisplayTarget::SourceCode { module_id } => {
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if let Some(path) = find_path::find_path(
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f.db.upcast(),
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ItemInNs::Types(def_id.into()),
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module_id,
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) {
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write!(f, "{}", path)?;
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} else {
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return Err(HirDisplayError::DisplaySourceCodeError(
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DisplaySourceCodeError::PathNotFound,
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));
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}
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}
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}
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if self.parameters.len() > 0 {
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let parameters_to_write =
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if f.display_target.is_source_code() || f.omit_verbose_types() {
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match self
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.ctor
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.as_generic_def()
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.map(|generic_def_id| f.db.generic_defaults(generic_def_id))
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.filter(|defaults| !defaults.is_empty())
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{
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None => self.parameters.0.as_ref(),
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Some(default_parameters) => {
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let mut default_from = 0;
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for (i, parameter) in self.parameters.iter().enumerate() {
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match (parameter, default_parameters.get(i)) {
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(&Ty::Unknown, _) | (_, None) => {
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default_from = i + 1;
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}
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(_, Some(default_parameter)) => {
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let actual_default = default_parameter
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.clone()
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.subst(&self.parameters.prefix(i));
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if parameter != &actual_default {
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default_from = i + 1;
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}
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}
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}
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}
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&self.parameters.0[0..default_from]
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}
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}
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} else {
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self.parameters.0.as_ref()
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};
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if !parameters_to_write.is_empty() {
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write!(f, "<")?;
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f.write_joined(parameters_to_write, ", ")?;
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write!(f, ">")?;
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}
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}
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}
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TypeCtor::AssociatedType(type_alias) => {
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let trait_ = match type_alias.lookup(f.db.upcast()).container {
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AssocContainerId::TraitId(it) => it,
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_ => panic!("not an associated type"),
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};
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let trait_ = f.db.trait_data(trait_);
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let type_alias = f.db.type_alias_data(type_alias);
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write!(f, "{}::{}", trait_.name, type_alias.name)?;
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if self.parameters.len() > 0 {
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write!(f, "<")?;
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f.write_joined(&*self.parameters.0, ", ")?;
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write!(f, ">")?;
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}
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}
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TypeCtor::OpaqueType(opaque_ty_id) => {
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let bounds = match opaque_ty_id {
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OpaqueTyId::ReturnTypeImplTrait(func, idx) => {
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let datas =
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f.db.return_type_impl_traits(func).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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data.subst(&self.parameters)
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}
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};
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write!(f, "impl ")?;
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write_bounds_like_dyn_trait(&bounds.value, f)?;
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// FIXME: it would maybe be good to distinguish this from the alias type (when debug printing), and to show the substitution
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}
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TypeCtor::Closure { .. } => {
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let sig = self.parameters[0].callable_sig(f.db);
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if let Some(sig) = sig {
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if sig.params().is_empty() {
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write!(f, "||")?;
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} else if f.omit_verbose_types() {
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write!(f, "|{}|", TYPE_HINT_TRUNCATION)?;
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} else {
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write!(f, "|")?;
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f.write_joined(sig.params(), ", ")?;
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write!(f, "|")?;
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};
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let ret_display = if f.omit_verbose_types() {
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sig.ret().display_truncated(f.db, f.max_size)
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} else {
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sig.ret().display(f.db)
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};
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write!(f, " -> {}", ret_display)?;
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} else {
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write!(f, "{{closure}}")?;
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}
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}
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}
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Ok(())
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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, "<{} as {}", self.parameters[0].display(f.db), trait_.name)?;
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if self.parameters.len() > 1 {
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write!(f, "<")?;
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f.write_joined(&self.parameters[1..], ", ")?;
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write!(f, ">")?;
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}
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write!(f, ">::{}", f.db.type_alias_data(self.associated_ty).name)?;
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Ok(())
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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 {
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Ty::Apply(a_ty) => a_ty.hir_fmt(f)?,
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Ty::Projection(p_ty) => p_ty.hir_fmt(f)?,
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Ty::Placeholder(id) => {
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let generics = generics(f.db.upcast(), id.parent);
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let param_data = &generics.params.types[id.local_id];
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match param_data.provenance {
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TypeParamProvenance::TypeParamList | TypeParamProvenance::TraitSelf => {
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write!(f, "{}", param_data.name.clone().unwrap_or_else(Name::missing))?
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}
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TypeParamProvenance::ArgumentImplTrait => {
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write!(f, "impl ")?;
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let bounds = f.db.generic_predicates_for_param(*id);
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let substs = Substs::type_params_for_generics(&generics);
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write_bounds_like_dyn_trait(
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&bounds.iter().map(|b| b.clone().subst(&substs)).collect::<Vec<_>>(),
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f,
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)?;
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}
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}
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}
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Ty::Bound(idx) => write!(f, "?{}.{}", idx.debruijn.depth(), idx.index)?,
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Ty::Dyn(predicates) => {
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write!(f, "dyn ")?;
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write_bounds_like_dyn_trait(predicates, f)?;
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}
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Ty::Opaque(opaque_ty) => {
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let bounds = match opaque_ty.opaque_ty_id {
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OpaqueTyId::ReturnTypeImplTrait(func, idx) => {
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let datas =
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f.db.return_type_impl_traits(func).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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data.subst(&opaque_ty.parameters)
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}
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};
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write!(f, "impl ")?;
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write_bounds_like_dyn_trait(&bounds.value, f)?;
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}
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Ty::Unknown => write!(f, "{{unknown}}")?,
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Ty::Infer(..) => write!(f, "_")?,
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}
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Ok(())
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}
|
|
}
|
|
|
|
fn write_bounds_like_dyn_trait(
|
|
predicates: &[GenericPredicate],
|
|
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;
|
|
for p in predicates.iter() {
|
|
match p {
|
|
GenericPredicate::Implemented(trait_ref) => {
|
|
if angle_open {
|
|
write!(f, ">")?;
|
|
}
|
|
if !first {
|
|
write!(f, " + ")?;
|
|
}
|
|
// We assume that the self type is $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_ref.trait_).name)?;
|
|
if trait_ref.substs.len() > 1 {
|
|
write!(f, "<")?;
|
|
f.write_joined(&trait_ref.substs[1..], ", ")?;
|
|
// there might be assoc type bindings, so we leave the angle brackets open
|
|
angle_open = true;
|
|
}
|
|
}
|
|
GenericPredicate::Projection(projection_pred) => {
|
|
// 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;
|
|
}
|
|
let type_alias = f.db.type_alias_data(projection_pred.projection_ty.associated_ty);
|
|
write!(f, "{} = ", type_alias.name)?;
|
|
projection_pred.ty.hir_fmt(f)?;
|
|
}
|
|
GenericPredicate::Error => {
|
|
if angle_open {
|
|
// impl Trait<X, {error}>
|
|
write!(f, ", ")?;
|
|
} else if !first {
|
|
// impl Trait + {error}
|
|
write!(f, " + ")?;
|
|
}
|
|
p.hir_fmt(f)?;
|
|
}
|
|
}
|
|
first = false;
|
|
}
|
|
if angle_open {
|
|
write!(f, ">")?;
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
impl TraitRef {
|
|
fn hir_fmt_ext(&self, f: &mut HirFormatter, use_as: bool) -> Result<(), HirDisplayError> {
|
|
if f.should_truncate() {
|
|
return write!(f, "{}", TYPE_HINT_TRUNCATION);
|
|
}
|
|
|
|
self.substs[0].hir_fmt(f)?;
|
|
if use_as {
|
|
write!(f, " as ")?;
|
|
} else {
|
|
write!(f, ": ")?;
|
|
}
|
|
write!(f, "{}", f.db.trait_data(self.trait_).name)?;
|
|
if self.substs.len() > 1 {
|
|
write!(f, "<")?;
|
|
f.write_joined(&self.substs[1..], ", ")?;
|
|
write!(f, ">")?;
|
|
}
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
impl HirDisplay for TraitRef {
|
|
fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
|
|
self.hir_fmt_ext(f, false)
|
|
}
|
|
}
|
|
|
|
impl HirDisplay for &GenericPredicate {
|
|
fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
|
|
HirDisplay::hir_fmt(*self, f)
|
|
}
|
|
}
|
|
|
|
impl HirDisplay for GenericPredicate {
|
|
fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
|
|
if f.should_truncate() {
|
|
return write!(f, "{}", TYPE_HINT_TRUNCATION);
|
|
}
|
|
|
|
match self {
|
|
GenericPredicate::Implemented(trait_ref) => trait_ref.hir_fmt(f)?,
|
|
GenericPredicate::Projection(projection_pred) => {
|
|
write!(f, "<")?;
|
|
projection_pred.projection_ty.trait_ref(f.db).hir_fmt_ext(f, true)?;
|
|
write!(
|
|
f,
|
|
">::{} = {}",
|
|
f.db.type_alias_data(projection_pred.projection_ty.associated_ty).name,
|
|
projection_pred.ty.display(f.db)
|
|
)?;
|
|
}
|
|
GenericPredicate::Error => write!(f, "{{error}}")?,
|
|
}
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
impl HirDisplay for Obligation {
|
|
fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
|
|
Ok(match self {
|
|
Obligation::Trait(tr) => write!(f, "Implements({})", tr.display(f.db))?,
|
|
Obligation::Projection(proj) => write!(
|
|
f,
|
|
"Normalize({} => {})",
|
|
proj.projection_ty.display(f.db),
|
|
proj.ty.display(f.db)
|
|
)?,
|
|
})
|
|
}
|
|
}
|