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use std::borrow::Cow;
use std::collections::BTreeSet;
use either::Either;
use uv_configuration::{Constraints, Excludes, Overrides};
use uv_distribution_types::Requirement;
use uv_normalize::PackageName;
use uv_types::RequestedRequirements;
use crate::preferences::Preferences;
use crate::{DependencyMode, Exclusions, ResolverEnvironment};
/// A manifest of requirements, constraints, and preferences.
#[derive(Clone, Debug)]
pub struct Manifest {
/// The direct requirements for the project.
pub(crate) requirements: Vec<Requirement>,
/// The constraints for the project.
pub(crate) constraints: Constraints,
/// The overrides for the project.
pub(crate) overrides: Overrides,
/// The dependency excludes for the project.
pub(crate) excludes: Excludes,
/// The preferences for the project.
///
/// These represent "preferred" versions of a given package. For example, they may be the
/// versions that are already installed in the environment, or already pinned in an existing
/// lockfile.
pub(crate) preferences: Preferences,
/// The name of the project.
pub(crate) project: Option<PackageName>,
/// Members of the project's workspace.
pub(crate) workspace_members: BTreeSet<PackageName>,
/// The installed packages to exclude from consideration during resolution.
///
/// These typically represent packages that are being upgraded or reinstalled
/// and should be pulled from a remote source like a package index.
pub(crate) exclusions: Exclusions,
/// The lookahead requirements for the project.
///
/// These represent transitive dependencies that should be incorporated when making
/// determinations around "allowed" versions (for example, "allowed" URLs or "allowed"
/// pre-release versions).
pub(crate) lookaheads: Vec<RequestedRequirements>,
}
impl Manifest {
pub fn new(
requirements: Vec<Requirement>,
constraints: Constraints,
overrides: Overrides,
excludes: Excludes,
preferences: Preferences,
project: Option<PackageName>,
workspace_members: BTreeSet<PackageName>,
exclusions: Exclusions,
lookaheads: Vec<RequestedRequirements>,
) -> Self {
Self {
requirements,
constraints,
overrides,
excludes,
preferences,
project,
workspace_members,
exclusions,
lookaheads,
}
}
pub fn simple(requirements: Vec<Requirement>) -> Self {
Self {
requirements,
constraints: Constraints::default(),
overrides: Overrides::default(),
excludes: Excludes::default(),
preferences: Preferences::default(),
project: None,
exclusions: Exclusions::default(),
workspace_members: BTreeSet::new(),
lookaheads: Vec::new(),
}
}
#[must_use]
pub fn with_constraints(mut self, constraints: Constraints) -> Self {
self.constraints = constraints;
self
}
/// Return an iterator over all requirements, constraints, and overrides, in priority order,
/// such that requirements come first, followed by constraints, followed by overrides.
///
/// At time of writing, this is used for:
/// - Determining which requirements should allow yanked versions.
/// - Determining which requirements should allow pre-release versions (e.g., `torch>=2.2.0a1`).
/// - Determining which requirements should allow direct URLs (e.g., `torch @ https://...`).
pub fn requirements<'a>(
&'a self,
env: &'a ResolverEnvironment,
mode: DependencyMode,
) -> impl Iterator<Item = Cow<'a, Requirement>> + 'a {
self.requirements_no_overrides(env, mode)
.chain(self.overrides(env, mode))
}
/// Like [`Self::requirements`], but without the overrides.
pub fn requirements_no_overrides<'a>(
&'a self,
env: &'a ResolverEnvironment,
mode: DependencyMode,
) -> impl Iterator<Item = Cow<'a, Requirement>> + 'a {
match mode {
// Include all direct and transitive requirements, with constraints and overrides applied.
DependencyMode::Transitive => Either::Left(
self.lookaheads
.iter()
.flat_map(move |lookahead| {
self.overrides
.apply(lookahead.requirements())
.filter(|requirement| !self.excludes.contains(&requirement.name))
.filter(move |requirement| {
requirement
.evaluate_markers(env.marker_environment(), lookahead.extras())
})
})
.chain(
self.overrides
.apply(&self.requirements)
.filter(|requirement| !self.excludes.contains(&requirement.name))
.filter(move |requirement| {
requirement.evaluate_markers(env.marker_environment(), &[])
}),
)
.chain(
self.constraints
.requirements()
.filter(|requirement| !self.excludes.contains(&requirement.name))
.filter(move |requirement| {
requirement.evaluate_markers(env.marker_environment(), &[])
})
.map(Cow::Borrowed),
),
),
// Include direct requirements, with constraints and overrides applied.
DependencyMode::Direct => Either::Right(
self.overrides
.apply(&self.requirements)
.chain(self.constraints.requirements().map(Cow::Borrowed))
.filter(|requirement| !self.excludes.contains(&requirement.name))
.filter(move |requirement| {
requirement.evaluate_markers(env.marker_environment(), &[])
}),
),
}
}
/// Only the overrides from [`Self::requirements`].
pub fn overrides<'a>(
&'a self,
env: &'a ResolverEnvironment,
mode: DependencyMode,
) -> impl Iterator<Item = Cow<'a, Requirement>> + 'a {
match mode {
// Include all direct and transitive requirements, with constraints and overrides applied.
DependencyMode::Transitive => Either::Left(
self.overrides
.requirements()
.filter(|requirement| !self.excludes.contains(&requirement.name))
.filter(move |requirement| {
requirement.evaluate_markers(env.marker_environment(), &[])
})
.map(Cow::Borrowed),
),
// Include direct requirements, with constraints and overrides applied.
DependencyMode::Direct => Either::Right(
self.overrides
.requirements()
.filter(|requirement| !self.excludes.contains(&requirement.name))
.filter(move |requirement| {
requirement.evaluate_markers(env.marker_environment(), &[])
})
.map(Cow::Borrowed),
),
}
}
/// Return an iterator over the names of all user-provided requirements.
///
/// This includes:
/// - Direct requirements
/// - Dependencies of editable requirements
/// - Transitive dependencies of local package requirements
///
/// At time of writing, this is used for:
/// - Determining which packages should use the "lowest-compatible version" of a package, when
/// the `lowest-direct` strategy is in use.
pub fn user_requirements<'a>(
&'a self,
env: &'a ResolverEnvironment,
mode: DependencyMode,
) -> impl Iterator<Item = Cow<'a, Requirement>> + 'a {
match mode {
// Include direct requirements, dependencies of editables, and transitive dependencies
// of local packages.
DependencyMode::Transitive => Either::Left(
self.lookaheads
.iter()
.filter(|lookahead| lookahead.direct())
.flat_map(move |lookahead| {
self.overrides
.apply(lookahead.requirements())
.filter(move |requirement| {
requirement
.evaluate_markers(env.marker_environment(), lookahead.extras())
})
})
.chain(
self.overrides
.apply(&self.requirements)
.filter(move |requirement| {
requirement.evaluate_markers(env.marker_environment(), &[])
}),
),
),
// Restrict to the direct requirements.
DependencyMode::Direct => {
Either::Right(self.overrides.apply(self.requirements.iter()).filter(
move |requirement| requirement.evaluate_markers(env.marker_environment(), &[]),
))
}
}
}
/// Returns an iterator over the direct requirements, with overrides applied.
///
/// At time of writing, this is used for:
/// - Determining which packages should have development dependencies included in the
/// resolution (assuming the user enabled development dependencies).
pub fn direct_requirements<'a>(
&'a self,
env: &'a ResolverEnvironment,
) -> impl Iterator<Item = Cow<'a, Requirement>> + 'a {
self.overrides
.apply(self.requirements.iter())
.filter(move |requirement| requirement.evaluate_markers(env.marker_environment(), &[]))
}
/// Apply the overrides and constraints to a set of requirements.
///
/// Constraints are always applied _on top_ of overrides, such that constraints are applied
/// even if a requirement is overridden.
pub fn apply<'a>(
&'a self,
requirements: impl IntoIterator<Item = &'a Requirement>,
) -> impl Iterator<Item = Cow<'a, Requirement>> {
self.constraints.apply(self.overrides.apply(requirements))
}
/// Returns the number of input requirements.
pub fn num_requirements(&self) -> usize {
self.requirements.len()
}
}