mirror of
https://github.com/salsa-rs/salsa.git
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93c30a953d
Switch to a procedural implementation of the `query_group!` macro,
residing in the `components/salsa_macros` subcrate.
Allow the user to override the invoked function via `salsa::invoke(...)`
and the name of the generated query type via `salsa::query_type(...)`.
In all tests, replace the `salsa::query_group! { ... }` invocations with
the new attribute-style `#[salsa::query_group]` macro, and change them
to the new naming scheme for query types (`...Query`).
Update README, examples, and documentation.
90 lines
2.2 KiB
Rust
90 lines
2.2 KiB
Rust
use salsa::Database;
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#[salsa::query_group]
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trait HelloWorldDatabase: salsa::Database {
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#[salsa::input]
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fn input(&self) -> String;
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fn length(&self) -> usize;
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fn double_length(&self) -> usize;
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}
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fn length(db: &impl HelloWorldDatabase) -> usize {
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let l = db.input().len();
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assert!(l > 0); // not meant to be invoked with no input
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l
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}
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fn double_length(db: &impl HelloWorldDatabase) -> usize {
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db.length() * 2
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}
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#[derive(Default)]
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struct DatabaseStruct {
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runtime: salsa::Runtime<DatabaseStruct>,
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}
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impl salsa::Database for DatabaseStruct {
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fn salsa_runtime(&self) -> &salsa::Runtime<DatabaseStruct> {
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&self.runtime
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}
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}
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salsa::database_storage! {
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struct DatabaseStorage for DatabaseStruct {
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impl HelloWorldDatabase {
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fn input() for InputQuery;
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fn length() for LengthQuery;
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fn double_length() for DoubleLengthQuery;
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}
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}
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}
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#[test]
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fn normal() {
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let mut db = DatabaseStruct::default();
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db.query_mut(InputQuery).set((), format!("Hello, world"));
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assert_eq!(db.double_length(), 24);
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db.query_mut(InputQuery).set((), format!("Hello, world!"));
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assert_eq!(db.double_length(), 26);
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}
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#[test]
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#[should_panic]
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fn use_without_set() {
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let db = DatabaseStruct::default();
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db.double_length();
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}
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#[test]
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fn using_set_unchecked_on_input() {
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let mut db = DatabaseStruct::default();
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db.query_mut(InputQuery)
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.set_unchecked((), format!("Hello, world"));
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assert_eq!(db.double_length(), 24);
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}
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#[test]
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fn using_set_unchecked_on_input_after() {
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let mut db = DatabaseStruct::default();
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db.query_mut(InputQuery).set((), format!("Hello, world"));
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assert_eq!(db.double_length(), 24);
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// If we use `set_unchecked`, we don't notice that `double_length`
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// is out of date. Oh well, don't do that.
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db.query_mut(InputQuery)
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.set_unchecked((), format!("Hello, world!"));
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assert_eq!(db.double_length(), 24);
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}
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#[test]
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fn using_set_unchecked() {
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let mut db = DatabaseStruct::default();
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// Use `set_unchecked` to intentionally set the wrong value,
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// demonstrating that the code never runs.
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db.query_mut(LengthQuery).set_unchecked((), 24);
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assert_eq!(db.double_length(), 48);
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}
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