use crate::{ mutable, parse::{hex_hash, newline}, store::file::loose::Reference,};use bstr::BString;use git_hash::ObjectId;use nom::{ bytes::complete::{tag, take_while}, combinator::{map, opt}, sequence::terminated, IResult,};use quick_error::quick_error;use std::convert::{TryFrom, TryInto}; enum MaybeUnsafeState { Id(ObjectId), UnvalidatedPath(BString),} quick_error! { /// The error returned by [`Reference::try_from_path()`]. #[derive(Debug)] #[allow(missing_docs)] pub enum Error { Parse(content: BString) { display("{:?} could not be parsed", content) } RefnameValidation{err: git_validate::reference::name::Error, path: BString} { display("The path to a symbolic reference within a ref file is invalid") source(err) } }} impl TryFrom<MaybeUnsafeState> for mutable::Target { type Error = Error; fn try_from(v: MaybeUnsafeState) -> Result<Self, Self::Error> { Ok(match v { MaybeUnsafeState::Id(id) => mutable::Target::Peeled(id), MaybeUnsafeState::UnvalidatedPath(name) => { mutable::Target::Symbolic(match git_validate::refname(name.as_ref()) { Ok(_) => mutable::FullName(name), Err(err) => return Err(Error::RefnameValidation { err, path: name }), }) } }) }} impl Reference { /// Create a new reference of the given `parent` store with `relative_path` service as unique identifier /// at which the `path_contents` was read to obtain the refs value. pub fn try_from_path(name: mutable::FullName, path_contents: &[u8]) -> Result<Self, Error> { Ok(Reference { name, target: parse(path_contents) .map_err(|_| Error::Parse(path_contents.into()))? .1 .try_into()?, }) }} fn parse(bytes: &[u8]) -> IResult<&[u8], MaybeUnsafeState> { let is_space = |b: u8| b == b' '; if let (path, Some(_ref_prefix)) = opt(terminated(tag("ref: "), take_while(is_space)))(bytes)? { map( terminated(take_while(|b| b != b'\r' && b != b'\n'), opt(newline)), |path| MaybeUnsafeState::UnvalidatedPath(path.into()), )(path) } else { map(terminated(hex_hash, opt(newline)), |hex| { MaybeUnsafeState::Id(ObjectId::from_hex(hex).expect("prior validation")) })(bytes) }}
use crate::{
mutable,
parse::{hex_hash, newline},
store::file::loose::Reference,
};
use bstr::BString;
use git_hash::ObjectId;
use nom::{
bytes::complete::{tag, take_while},
combinator::{map, opt},
sequence::terminated,
IResult,
};
use quick_error::quick_error;
use std::convert::{TryFrom, TryInto};
enum MaybeUnsafeState {
Id(ObjectId),
UnvalidatedPath(BString),
}
quick_error! {
/// The error returned by [`Reference::try_from_path()`].
#[derive(Debug)]
#[allow(missing_docs)]
pub enum Error {
Parse(content: BString) {
display("{:?} could not be parsed", content)
}
RefnameValidation{err: git_validate::reference::name::Error, path: BString} {
display("The path to a symbolic reference within a ref file is invalid")
source(err)
}
}
}
impl TryFrom<MaybeUnsafeState> for mutable::Target {
type Error = Error;
fn try_from(v: MaybeUnsafeState) -> Result<Self, Self::Error> {
Ok(match v {
MaybeUnsafeState::Id(id) => mutable::Target::Peeled(id),
MaybeUnsafeState::UnvalidatedPath(name) => {
mutable::Target::Symbolic(match git_validate::refname(name.as_ref()) {
Ok(_) => mutable::FullName(name),
Err(err) => return Err(Error::RefnameValidation { err, path: name }),
})
}
})
}
}
impl Reference {
/// Create a new reference of the given `parent` store with `relative_path` service as unique identifier
/// at which the `path_contents` was read to obtain the refs value.
pub fn try_from_path(name: mutable::FullName, path_contents: &[u8]) -> Result<Self, Error> {
Ok(Reference {
name,
target: parse(path_contents)
.map_err(|_| Error::Parse(path_contents.into()))?
.1
.try_into()?,
})
}
}
fn parse(bytes: &[u8]) -> IResult<&[u8], MaybeUnsafeState> {
let is_space = |b: u8| b == b' ';
if let (path, Some(_ref_prefix)) = opt(terminated(tag("ref: "), take_while(is_space)))(bytes)? {
map(
terminated(take_while(|b| b != b'\r' && b != b'\n'), opt(newline)),
|path| MaybeUnsafeState::UnvalidatedPath(path.into()),
)(path)
} else {
map(terminated(hex_hash, opt(newline)), |hex| {
MaybeUnsafeState::Id(ObjectId::from_hex(hex).expect("prior validation"))
})(bytes)
}
}