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use std::{fmt, any::Any};
use ra_syntax::{SyntaxNodePtr, AstPtr, ast};
use relative_path::RelativePathBuf;
use crate::HirFileId;
/// Diagnostic defines hir API for errors and warnings.
///
/// It is used as a `dyn` object, which you can downcast to a concrete
/// diagnostic. DiagnosticSink are structured, meaning that they include rich
/// information which can be used by IDE to create fixes. DiagnosticSink are
/// expressed in terms of macro-expanded syntax tree nodes (so, it's a bad idea
/// to diagnostic in a salsa value).
///
/// Internally, various subsystems of hir produce diagnostics specific to a
/// subsystem (typically, an `enum`), which are safe to store in salsa but do not
/// include source locations. Such internal diagnostic are transformed into an
/// instance of `Diagnostic` on demand.
pub trait Diagnostic: Any + Send + Sync + fmt::Debug + 'static {
fn message(&self) -> String;
fn file(&self) -> HirFileId;
fn syntax_node(&self) -> SyntaxNodePtr;
fn as_any(&self) -> &(dyn Any + Send + 'static);
}
impl dyn Diagnostic {
pub fn downcast_ref<D: Diagnostic>(&self) -> Option<&D> {
self.as_any().downcast_ref()
}
}
pub struct DiagnosticSink<'a> {
callbacks: Vec<Box<dyn FnMut(&dyn Diagnostic) -> Result<(), ()> + 'a>>,
default_callback: Box<dyn FnMut(&dyn Diagnostic) + 'a>,
}
impl<'a> DiagnosticSink<'a> {
pub fn new(cb: impl FnMut(&dyn Diagnostic) + 'a) -> DiagnosticSink<'a> {
DiagnosticSink { callbacks: Vec::new(), default_callback: Box::new(cb) }
}
pub fn on<D: Diagnostic, F: FnMut(&D) + 'a>(mut self, mut cb: F) -> DiagnosticSink<'a> {
let cb = move |diag: &dyn Diagnostic| match diag.downcast_ref::<D>() {
Some(d) => {
cb(d);
Ok(())
}
None => Err(()),
};
self.callbacks.push(Box::new(cb));
self
}
pub(crate) fn push(&mut self, d: impl Diagnostic) {
let d: &dyn Diagnostic = &d;
for cb in self.callbacks.iter_mut() {
match cb(d) {
Ok(()) => return,
Err(()) => (),
}
}
(self.default_callback)(d)
}
}
#[derive(Debug)]
pub struct NoSuchField {
pub file: HirFileId,
pub field: AstPtr<ast::NamedField>,
}
impl Diagnostic for NoSuchField {
fn message(&self) -> String {
"no such field".to_string()
}
fn file(&self) -> HirFileId {
self.file
}
fn syntax_node(&self) -> SyntaxNodePtr {
self.field.into()
}
fn as_any(&self) -> &(Any + Send + 'static) {
self
}
}
#[derive(Debug)]
pub struct UnresolvedModule {
pub file: HirFileId,
pub decl: AstPtr<ast::Module>,
pub candidate: RelativePathBuf,
}
impl Diagnostic for UnresolvedModule {
fn message(&self) -> String {
"unresolved module".to_string()
}
fn file(&self) -> HirFileId {
self.file
}
fn syntax_node(&self) -> SyntaxNodePtr {
self.decl.into()
}
fn as_any(&self) -> &(Any + Send + 'static) {
self
}
}
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