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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<D: Diagnostic>(&self) -> Option<&D> {
self.as_any().downcast_ref()
}
}
#[derive(Debug, Default)]
pub struct DiagnosticSink {
data: Vec<Box<dyn Diagnostic>>,
}
impl DiagnosticSink {
pub fn push(&mut self, d: impl Diagnostic) {
self.data.push(Box::new(d))
}
pub fn into_diagnostics(self) -> Vec<Box<dyn Diagnostic>> {
self.data
}
}
#[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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