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use crate::PackageId;
use cargo_metadata::Error as MetadataError;
use serde_json;
use std::error;
use std::fmt;
use Error::*;
#[derive(Debug)]
#[non_exhaustive]
pub enum Error {
CommandError(MetadataError),
MetadataParseError(serde_json::Error),
PackageGraphConstructError(String),
UnknownPackageId(PackageId),
UnknownFeatureId(PackageId, Option<String>),
UnknownCurrentPlatform,
PackageGraphInternalError(String),
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
CommandError(err) => write!(f, "Error while executing 'cargo metadata': {}", err),
MetadataParseError(err) => write!(
f,
"Error while parsing 'cargo metadata' JSON output: {}",
err
),
PackageGraphConstructError(msg) => {
write!(f, "Error while computing package graph: {}", msg)
}
UnknownPackageId(id) => write!(f, "Unknown package ID: {}", id),
UnknownFeatureId(package_id, feature) => match feature {
Some(feature) => write!(f, "Unknown feature ID: '{}' '{}'", package_id, feature),
None => write!(f, "Unknown feature ID: '{}' (base)", package_id),
},
UnknownCurrentPlatform => write!(f, "Unknown current platform"),
PackageGraphInternalError(msg) => write!(f, "Internal error in package graph: {}", msg),
}
}
}
impl error::Error for Error {
fn source(&self) -> Option<&(dyn error::Error + 'static)> {
match self {
MetadataParseError(err) => Some(err),
CommandError(_) => None,
PackageGraphConstructError(_) => None,
UnknownPackageId(_) => None,
UnknownFeatureId(_, _) => None,
UnknownCurrentPlatform => None,
PackageGraphInternalError(_) => None,
}
}
}
#[derive(Clone, Debug, Eq, Ord, PartialEq, PartialOrd)]
#[non_exhaustive]
pub enum FeatureGraphWarning {
MissingFeature {
stage: FeatureBuildStage,
package_id: PackageId,
feature_name: String,
},
}
impl fmt::Display for FeatureGraphWarning {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
use FeatureGraphWarning::*;
match self {
MissingFeature {
stage,
package_id,
feature_name,
} => write!(
f,
"{}: for package '{}', missing feature '{}'",
stage, package_id, feature_name
),
}
}
}
#[derive(Clone, Debug, Eq, Ord, PartialEq, PartialOrd)]
#[non_exhaustive]
pub enum FeatureBuildStage {
AddNamedFeatureEdges {
package_id: PackageId,
from_feature: String,
},
AddDependencyEdges {
package_id: PackageId,
dep_name: String,
},
}
impl fmt::Display for FeatureBuildStage {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
use FeatureBuildStage::*;
match self {
AddNamedFeatureEdges {
package_id,
from_feature,
} => write!(
f,
"for package '{}', while adding named feature edges from '{}'",
package_id, from_feature
),
AddDependencyEdges {
package_id,
dep_name,
} => write!(
f,
"for package '{}', while adding edges for dependency '{}'",
package_id, dep_name,
),
}
}
}