73 lines
2.3 KiB
Rust
73 lines
2.3 KiB
Rust
//! ra_db defines basic database traits. The concrete DB is defined by ra_ide_api.
|
|
mod cancellation;
|
|
mod input;
|
|
mod loc2id;
|
|
pub mod mock;
|
|
|
|
use std::panic;
|
|
|
|
use ra_syntax::{TextUnit, TextRange, SourceFile, TreeArc};
|
|
|
|
pub use ::salsa as salsa;
|
|
pub use crate::{
|
|
cancellation::Canceled,
|
|
input::{
|
|
FilesDatabase, FileId, CrateId, SourceRoot, SourceRootId, CrateGraph, Dependency,
|
|
FileTextQuery, FileSourceRootQuery, SourceRootQuery, LocalRootsQuery, LibraryRootsQuery, CrateGraphQuery,
|
|
FileRelativePathQuery
|
|
},
|
|
loc2id::LocationIntener,
|
|
};
|
|
|
|
pub trait BaseDatabase: salsa::Database + panic::RefUnwindSafe {
|
|
/// Aborts current query if there are pending changes.
|
|
///
|
|
/// rust-analyzer needs to be able to answer semantic questions about the
|
|
/// code while the code is being modified. A common problem is that a
|
|
/// long-running query is being calculated when a new change arrives.
|
|
///
|
|
/// We can't just apply the change immediately: this will cause the pending
|
|
/// query to see inconsistent state (it will observe an absence of
|
|
/// repeatable read). So what we do is we **cancel** all pending queries
|
|
/// before applying the change.
|
|
///
|
|
/// We implement cancellation by panicking with a special value and catching
|
|
/// it on the API boundary. Salsa explicitly supports this use-case.
|
|
fn check_canceled(&self) {
|
|
if self.salsa_runtime().is_current_revision_canceled() {
|
|
Canceled::throw()
|
|
}
|
|
}
|
|
|
|
fn catch_canceled<F: FnOnce(&Self) -> T + panic::UnwindSafe, T>(
|
|
&self,
|
|
f: F,
|
|
) -> Result<T, Canceled> {
|
|
panic::catch_unwind(|| f(self)).map_err(|err| match err.downcast::<Canceled>() {
|
|
Ok(canceled) => *canceled,
|
|
Err(payload) => panic::resume_unwind(payload),
|
|
})
|
|
}
|
|
}
|
|
|
|
#[salsa::query_group]
|
|
pub trait SyntaxDatabase: crate::input::FilesDatabase + BaseDatabase {
|
|
fn source_file(&self, file_id: FileId) -> TreeArc<SourceFile>;
|
|
}
|
|
|
|
fn source_file(db: &impl SyntaxDatabase, file_id: FileId) -> TreeArc<SourceFile> {
|
|
let text = db.file_text(file_id);
|
|
SourceFile::parse(&*text)
|
|
}
|
|
|
|
#[derive(Clone, Copy, Debug)]
|
|
pub struct FilePosition {
|
|
pub file_id: FileId,
|
|
pub offset: TextUnit,
|
|
}
|
|
|
|
#[derive(Clone, Copy, Debug)]
|
|
pub struct FileRange {
|
|
pub file_id: FileId,
|
|
pub range: TextRange,
|
|
}
|