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// Copyright (c) The cargo-guppy Contributors
// SPDX-License-Identifier: MIT OR Apache-2.0
use crate::{
Error, PackageId,
graph::{
DependencyDirection, LinkVisitorFn, PackageGraph, PackageIx, PackageLink,
PackageLinkContext, PackageLinkVisitor, PackageSet,
feature::{FeatureFilter, FeatureQuery},
},
};
use camino::Utf8Path;
use petgraph::prelude::*;
/// A query over a package graph.
///
/// This is the entry point for iterators over IDs and dependency links, and dot graph presentation.
/// A `PackageQuery` is constructed through the `query_` methods on `PackageGraph`.
#[derive(Clone, Debug)]
pub struct PackageQuery<'g> {
// The fields are pub(super) for access within the graph module.
pub(super) initials: PackageSet<'g>,
pub(super) direction: DependencyDirection,
}
assert_covariant!(PackageQuery);
/// ## Queries
///
/// The methods in this section create *queries* over subsets of this package graph. Use the methods
/// here to analyze transitive dependencies.
impl PackageGraph {
/// Creates a new forward query over the entire workspace.
///
/// `query_workspace` will select all workspace packages and their transitive dependencies. To
/// create a `PackageSet` with just workspace packages, use `resolve_workspace`.
pub fn query_workspace(&self) -> PackageQuery<'_> {
self.query_forward(self.workspace().member_ids())
.expect("workspace packages should all be known")
}
/// Creates a new forward query over the specified workspace packages by path.
///
/// Returns an error if any workspace paths were unknown.
pub fn query_workspace_paths(
&self,
paths: impl IntoIterator<Item = impl AsRef<Utf8Path>>,
) -> Result<PackageQuery<'_>, Error> {
let workspace = self.workspace();
let package_ixs = paths
.into_iter()
.map(|path| {
workspace
.member_by_path(path.as_ref())
.map(|package| package.package_ix())
})
.collect::<Result<Vec<_>, Error>>()?;
Ok(self.query_from_parts(package_ixs, DependencyDirection::Forward))
}
/// Creates a new forward query over the specified workspace packages by name.
///
/// This is similar to `cargo`'s `--package` option.
///
/// Returns an error if any package names were unknown.
pub fn query_workspace_names(
&self,
names: impl IntoIterator<Item = impl AsRef<str>>,
) -> Result<PackageQuery<'_>, Error> {
let workspace = self.workspace();
let package_ixs = names
.into_iter()
.map(|name| {
workspace
.member_by_name(name.as_ref())
.map(|package| package.package_ix())
})
.collect::<Result<Vec<_>, Error>>()?;
Ok(self.query_from_parts(package_ixs, DependencyDirection::Forward))
}
/// Creates a new query that returns transitive dependencies of the given packages in the
/// specified direction.
///
/// Returns an error if any package IDs are unknown.
pub fn query_directed<'g, 'a>(
&'g self,
package_ids: impl IntoIterator<Item = &'a PackageId>,
dep_direction: DependencyDirection,
) -> Result<PackageQuery<'g>, Error> {
match dep_direction {
DependencyDirection::Forward => self.query_forward(package_ids),
DependencyDirection::Reverse => self.query_reverse(package_ids),
}
}
/// Creates a new query that returns transitive dependencies of the given packages.
///
/// Returns an error if any package IDs are unknown.
pub fn query_forward<'g, 'a>(
&'g self,
package_ids: impl IntoIterator<Item = &'a PackageId>,
) -> Result<PackageQuery<'g>, Error> {
let package_ixs: Vec<_> = self.package_ixs(package_ids)?;
Ok(self.query_from_parts(package_ixs, DependencyDirection::Forward))
}
/// Creates a new query that returns transitive reverse dependencies of the given packages.
///
/// Returns an error if any package IDs are unknown.
pub fn query_reverse<'g, 'a>(
&'g self,
package_ids: impl IntoIterator<Item = &'a PackageId>,
) -> Result<PackageQuery<'g>, Error> {
let package_ixs: Vec<_> = self.package_ixs(package_ids)?;
Ok(self.query_from_parts(package_ixs, DependencyDirection::Reverse))
}
pub(super) fn query_from_parts(
&self,
package_ixs: impl IntoIterator<Item = NodeIndex<PackageIx>>,
direction: DependencyDirection,
) -> PackageQuery<'_> {
PackageQuery {
initials: PackageSet::from_ixs(self, package_ixs),
direction,
}
}
}
impl<'g> PackageQuery<'g> {
/// Returns the package graph on which the query is going to be executed.
pub fn graph(&self) -> &'g PackageGraph {
self.initials.graph()
}
/// Returns the direction the query is happening in.
pub fn direction(&self) -> DependencyDirection {
self.direction
}
/// Returns the set of initial packages specified in the query.
pub fn initials(&self) -> &PackageSet<'g> {
&self.initials
}
/// Converts this `PackageQuery` into a `FeatureQuery`, using the given feature filter.
///
/// This will cause the feature graph to be constructed if it hasn't been done so already.
pub fn to_feature_query(&self, filter: impl FeatureFilter<'g>) -> FeatureQuery<'g> {
let feature_graph = self.graph().feature_graph();
let feature_ixs: Vec<_> =
feature_graph.feature_ixs_for_package_ixs_filtered(self.initials.sorted_ixs(), filter);
feature_graph.query_from_parts(feature_ixs, self.direction)
}
/// Resolves this query into a set of known packages, following every link found along the
/// way.
///
/// This is the entry point for iterators.
pub fn resolve(self) -> PackageSet<'g> {
PackageSet::new(self)
}
/// Resolves this query into a set of known packages, using the provided visitor to
/// determine which links are followed.
pub fn resolve_with(self, visitor: impl PackageLinkVisitor<'g>) -> PackageSet<'g> {
PackageSet::with_link_visitor(self, visitor)
}
/// Resolves this query into a set of known packages, using the provided visitor function
/// to determine which links are followed.
pub fn resolve_with_fn(
self,
visitor_fn: impl FnMut(&PackageLinkContext<'g>, PackageLink<'g>) -> bool,
) -> PackageSet<'g> {
self.resolve_with(LinkVisitorFn(visitor_fn))
}
}