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dependency.rs
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dependency.rs
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use std::fmt;
use std::rc::Rc;
use std::str::FromStr;
use semver::VersionReq;
use semver::ReqParseError;
use rustc_serialize::{Encoder, Encodable};
use core::{SourceId, Summary, PackageId};
use util::{CargoError, CargoResult, Cfg, CfgExpr, ChainError, human, Config};
/// Information about a dependency requested by a Cargo manifest.
/// Cheap to copy.
#[derive(PartialEq, Clone ,Debug)]
pub struct Dependency {
inner: Rc<DependencyInner>,
}
/// The data underlying a Dependency.
#[derive(PartialEq, Clone, Debug)]
pub struct DependencyInner {
name: String,
source_id: SourceId,
req: VersionReq,
specified_req: bool,
kind: Kind,
only_match_name: bool,
optional: bool,
default_features: bool,
features: Vec<String>,
// This dependency should be used only for this platform.
// `None` means *all platforms*.
platform: Option<Platform>,
}
#[derive(Clone, Debug, PartialEq)]
pub enum Platform {
Name(String),
Cfg(CfgExpr),
}
#[derive(RustcEncodable)]
struct SerializedDependency<'a> {
name: &'a str,
source: &'a SourceId,
req: String,
kind: Kind,
optional: bool,
uses_default_features: bool,
features: &'a [String],
target: Option<&'a Platform>,
}
impl Encodable for Dependency {
fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
SerializedDependency {
name: self.name(),
source: &self.source_id(),
req: self.version_req().to_string(),
kind: self.kind(),
optional: self.is_optional(),
uses_default_features: self.uses_default_features(),
features: self.features(),
target: self.platform(),
}.encode(s)
}
}
#[derive(PartialEq, Clone, Debug, Copy)]
pub enum Kind {
Normal,
Development,
Build,
}
impl Encodable for Kind {
fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
match *self {
Kind::Normal => None,
Kind::Development => Some("dev"),
Kind::Build => Some("build"),
}.encode(s)
}
}
impl DependencyInner {
/// Attempt to create a `Dependency` from an entry in the manifest.
///
/// The `deprecated_extra` information is set to `Some` when this method
/// should *also* parse historically deprecated semver requirements. This
/// information allows providing diagnostic information about what's going
/// on.
///
/// If set to `None`, then historically deprecated semver requirements will
/// all be rejected.
pub fn parse(name: &str,
version: Option<&str>,
source_id: &SourceId,
deprecated_extra: Option<(&PackageId, &Config)>)
-> CargoResult<DependencyInner> {
let (specified_req, version_req) = match version {
Some(v) => (true, try!(DependencyInner::parse_with_deprecated(v, deprecated_extra))),
None => (false, VersionReq::any())
};
Ok(DependencyInner {
only_match_name: false,
req: version_req,
specified_req: specified_req,
.. DependencyInner::new_override(name, source_id)
})
}
fn parse_with_deprecated(req: &str,
extra: Option<(&PackageId, &Config)>)
-> CargoResult<VersionReq> {
match VersionReq::parse(req) {
Err(e) => {
let (inside, config) = match extra {
Some(pair) => pair,
None => return Err(e.into()),
};
match e {
ReqParseError::DeprecatedVersionRequirement(requirement) => {
let msg = format!("\
parsed version requirement `{}` is no longer valid
Previous versions of Cargo accepted this malformed requirement,
but it is being deprecated. This was found when parsing the manifest
of {} {}, and the correct version requirement is `{}`.
This will soon become a hard error, so it's either recommended to
update to a fixed version or contact the upstream maintainer about
this warning.
",
req, inside.name(), inside.version(), requirement);
try!(config.shell().warn(&msg));
Ok(requirement)
}
e => Err(From::from(e)),
}
},
Ok(v) => Ok(v),
}
}
pub fn new_override(name: &str, source_id: &SourceId) -> DependencyInner {
DependencyInner {
name: name.to_string(),
source_id: source_id.clone(),
req: VersionReq::any(),
kind: Kind::Normal,
only_match_name: true,
optional: false,
features: Vec::new(),
default_features: true,
specified_req: false,
platform: None,
}
}
pub fn version_req(&self) -> &VersionReq { &self.req }
pub fn name(&self) -> &str { &self.name }
pub fn source_id(&self) -> &SourceId { &self.source_id }
pub fn kind(&self) -> Kind { self.kind }
pub fn specified_req(&self) -> bool { self.specified_req }
/// If none, this dependency must be built for all platforms.
/// If some, it must only be built for matching platforms.
pub fn platform(&self) -> Option<&Platform> {
self.platform.as_ref()
}
pub fn set_kind(mut self, kind: Kind) -> DependencyInner {
self.kind = kind;
self
}
/// Sets the list of features requested for the package.
pub fn set_features(mut self, features: Vec<String>) -> DependencyInner {
self.features = features;
self
}
/// Sets whether the dependency requests default features of the package.
pub fn set_default_features(mut self, default_features: bool) -> DependencyInner {
self.default_features = default_features;
self
}
/// Sets whether the dependency is optional.
pub fn set_optional(mut self, optional: bool) -> DependencyInner {
self.optional = optional;
self
}
/// Set the source id for this dependency
pub fn set_source_id(mut self, id: SourceId) -> DependencyInner {
self.source_id = id;
self
}
/// Set the version requirement for this dependency
pub fn set_version_req(mut self, req: VersionReq) -> DependencyInner {
self.req = req;
self
}
pub fn set_platform(mut self, platform: Option<Platform>)
-> DependencyInner {
self.platform = platform;
self
}
/// Lock this dependency to depending on the specified package id
pub fn lock_to(self, id: &PackageId) -> DependencyInner {
assert_eq!(self.source_id, *id.source_id());
assert!(self.req.matches(id.version()));
self.set_version_req(VersionReq::exact(id.version()))
.set_source_id(id.source_id().clone())
}
/// Returns false if the dependency is only used to build the local package.
pub fn is_transitive(&self) -> bool {
match self.kind {
Kind::Normal | Kind::Build => true,
Kind::Development => false,
}
}
pub fn is_build(&self) -> bool {
match self.kind { Kind::Build => true, _ => false }
}
pub fn is_optional(&self) -> bool { self.optional }
/// Returns true if the default features of the dependency are requested.
pub fn uses_default_features(&self) -> bool { self.default_features }
/// Returns the list of features that are requested by the dependency.
pub fn features(&self) -> &[String] { &self.features }
/// Returns true if the package (`sum`) can fulfill this dependency request.
pub fn matches(&self, sum: &Summary) -> bool {
self.matches_id(sum.package_id())
}
/// Returns true if the package (`id`) can fulfill this dependency request.
pub fn matches_id(&self, id: &PackageId) -> bool {
self.name == id.name() &&
(self.only_match_name || (self.req.matches(id.version()) &&
&self.source_id == id.source_id()))
}
pub fn into_dependency(self) -> Dependency {
Dependency {inner: Rc::new(self)}
}
}
impl Dependency {
/// Attempt to create a `Dependency` from an entry in the manifest.
pub fn parse(name: &str,
version: Option<&str>,
source_id: &SourceId,
inside: &PackageId,
config: &Config) -> CargoResult<Dependency> {
let arg = Some((inside, config));
DependencyInner::parse(name, version, source_id, arg).map(|di| {
di.into_dependency()
})
}
/// Attempt to create a `Dependency` from an entry in the manifest.
pub fn parse_no_deprecated(name: &str,
version: Option<&str>,
source_id: &SourceId) -> CargoResult<Dependency> {
DependencyInner::parse(name, version, source_id, None).map(|di| {
di.into_dependency()
})
}
pub fn new_override(name: &str, source_id: &SourceId) -> Dependency {
DependencyInner::new_override(name, source_id).into_dependency()
}
pub fn clone_inner(&self) -> DependencyInner { (*self.inner).clone() }
pub fn version_req(&self) -> &VersionReq { self.inner.version_req() }
pub fn name(&self) -> &str { self.inner.name() }
pub fn source_id(&self) -> &SourceId { self.inner.source_id() }
pub fn kind(&self) -> Kind { self.inner.kind() }
pub fn specified_req(&self) -> bool { self.inner.specified_req() }
/// If none, this dependencies must be built for all platforms.
/// If some, it must only be built for the specified platform.
pub fn platform(&self) -> Option<&Platform> {
self.inner.platform()
}
/// Lock this dependency to depending on the specified package id
pub fn lock_to(self, id: &PackageId) -> Dependency {
self.clone_inner().lock_to(id).into_dependency()
}
/// Returns false if the dependency is only used to build the local package.
pub fn is_transitive(&self) -> bool { self.inner.is_transitive() }
pub fn is_build(&self) -> bool { self.inner.is_build() }
pub fn is_optional(&self) -> bool { self.inner.is_optional() }
/// Returns true if the default features of the dependency are requested.
pub fn uses_default_features(&self) -> bool {
self.inner.uses_default_features()
}
/// Returns the list of features that are requested by the dependency.
pub fn features(&self) -> &[String] { self.inner.features() }
/// Returns true if the package (`sum`) can fulfill this dependency request.
pub fn matches(&self, sum: &Summary) -> bool { self.inner.matches(sum) }
/// Returns true if the package (`id`) can fulfill this dependency request.
pub fn matches_id(&self, id: &PackageId) -> bool {
self.inner.matches_id(id)
}
pub fn map_source(self, to_replace: &SourceId, replace_with: &SourceId)
-> Dependency {
if self.source_id() != to_replace {
self
} else {
Rc::try_unwrap(self.inner).unwrap_or_else(|r| (*r).clone())
.set_source_id(replace_with.clone())
.into_dependency()
}
}
}
impl Platform {
pub fn matches(&self, name: &str, cfg: Option<&[Cfg]>) -> bool {
match *self {
Platform::Name(ref p) => p == name,
Platform::Cfg(ref p) => {
match cfg {
Some(cfg) => p.matches(cfg),
None => false,
}
}
}
}
}
impl Encodable for Platform {
fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
self.to_string().encode(s)
}
}
impl FromStr for Platform {
type Err = Box<CargoError>;
fn from_str(s: &str) -> CargoResult<Platform> {
if s.starts_with("cfg(") && s.ends_with(")") {
let s = &s[4..s.len()-1];
s.parse().map(Platform::Cfg).chain_error(|| {
human(format!("failed to parse `{}` as a cfg expression", s))
})
} else {
Ok(Platform::Name(s.to_string()))
}
}
}
impl fmt::Display for Platform {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
Platform::Name(ref n) => n.fmt(f),
Platform::Cfg(ref e) => write!(f, "cfg({})", e),
}
}
}