use std::{fmt, any::Any}; use ra_syntax::{SyntaxNodePtr, AstPtr, ast}; use crate::HirFileId; use relative_path::RelativePathBuf; /// 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) -> &(Any + Send + 'static); } impl dyn Diagnostic { pub fn downcast_ref(&self) -> Option<&D> { self.as_any().downcast_ref() } } #[derive(Debug, Default)] pub struct DiagnosticSink { data: Vec>, } impl DiagnosticSink { pub fn push(&mut self, d: impl Diagnostic) { self.data.push(Box::new(d)) } pub fn into_diagnostics(self) -> Vec> { self.data } } #[derive(Debug)] pub struct NoSuchField { pub file: HirFileId, pub field: AstPtr, } 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, 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 } }