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https://github.com/salsa-rs/salsa.git
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fad97eeb6a
This had two unexpected consequences, one unfortunate, one "medium": * All `salsa::Database` must be `'static`. This falls out from `Q::DynDb` not having access to any lifetimes, but also the defaulting rules for `dyn QueryGroup` that make it `dyn QueryGroup + 'static`. We don't really support generic databases anyway yet so this isn't a big deal, and we can add workarounds later (ideally via GATs). * It is now statically impossible to invoke `snapshot` from a query, and so we don't need to test that it panics. This is because the signature of `snapshot` returns a `Snapshot<Self>` and that is not accessible to a `dyn QueryGroup` type. Similarly, invoking `Runtime::snapshot` directly is not possible becaues it is crate-private. So I removed the test. This seems ok, but eventually I would like to expose ways for queries to do parallel execution (matklad and I had talked about a "speculation" primitive for enabling that). * This commit is 99% boilerplate I did with search-and-replace. I also rolled in a few other changes I might have preferred to factor out, most notably removing the `GetQueryTable` plumbing trait in favor of free-methods, but it was awkward to factor them out and get all the generics right (so much simpler in this version).
73 lines
1.9 KiB
Rust
73 lines
1.9 KiB
Rust
use std::sync::Arc;
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use crate::{interner::Interner, values::*};
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#[salsa::query_group(CompilerDatabase)]
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pub trait Compiler: Interner {
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#[salsa::input]
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fn input_string(&self) -> Arc<String>;
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/// Get the fields.
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fn fields(&self, class: Class) -> Arc<Vec<Field>>;
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/// Get the list of all classes
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fn all_classes(&self) -> Arc<Vec<Class>>;
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/// Get the list of all fields
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fn all_fields(&self) -> Arc<Vec<Field>>;
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}
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/// This function parses a dummy language with the following structure:
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///
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/// Classes are defined one per line, consisting of a comma-separated list of fields.
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///
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/// Example:
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///
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/// ```
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/// lorem,ipsum
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/// dolor,sit,amet,
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/// consectetur,adipiscing,elit
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/// ```
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fn all_classes(db: &dyn Compiler) -> Arc<Vec<Class>> {
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let string = db.input_string();
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let rows = string.split('\n');
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let classes: Vec<_> = rows
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.filter(|string| !string.is_empty())
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.map(|string| {
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let fields = string
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.trim()
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.split(',')
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.filter(|string| !string.is_empty())
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.map(|name_str| {
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let name = name_str.to_owned();
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let field_data = FieldData { name };
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db.intern_field(field_data)
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})
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.collect();
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let class_data = ClassData { fields };
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db.intern_class(class_data)
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})
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.collect();
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Arc::new(classes)
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}
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fn fields(db: &dyn Compiler, class: Class) -> Arc<Vec<Field>> {
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let class = db.lookup_intern_class(class);
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let fields = class.fields.clone();
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Arc::new(fields)
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}
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fn all_fields(db: &dyn Compiler) -> Arc<Vec<Field>> {
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Arc::new(
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db.all_classes()
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.iter()
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.cloned()
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.flat_map(|class| {
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let fields = db.fields(class);
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(0..fields.len()).map(move |i| fields[i])
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})
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.collect(),
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)
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}
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