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use std::borrow::Cow;
use bstr::BStr;
use gix_hash::{oid, ObjectId};
use nom::{
branch::alt,
bytes::complete::is_not,
combinator::{all_consuming, opt},
error::context,
};
use crate::{bstr::ByteSlice, commit::decode, parse, parse::NL, CommitRefIter};
#[derive(Copy, Clone)]
pub(crate) enum SignatureKind {
Author,
Committer,
}
#[derive(Default, Copy, Clone)]
pub(crate) enum State {
#[default]
Tree,
Parents,
Signature {
of: SignatureKind,
},
Encoding,
ExtraHeaders,
Message,
}
impl<'a> CommitRefIter<'a> {
/// Create a commit iterator from data.
pub fn from_bytes(data: &'a [u8]) -> CommitRefIter<'a> {
CommitRefIter {
data,
state: State::default(),
}
}
/// Returns the object id of this commits tree if it is the first function called and if there is no error in decoding
/// the data.
///
/// Note that this method must only be called once or else will always return None while consuming a single token.
/// Errors are coerced into options, hiding whether there was an error or not. The caller should assume an error if they
/// call the method as intended. Such a squelched error cannot be recovered unless the objects data is retrieved and parsed again.
/// `next()`.
pub fn tree_id(&mut self) -> Result<ObjectId, crate::decode::Error> {
let tree_id = self.next().ok_or_else(missing_field)??;
Token::try_into_id(tree_id).ok_or_else(missing_field)
}
/// Return all `parent_ids` as iterator.
///
/// Parsing errors are ignored quietly.
pub fn parent_ids(self) -> impl Iterator<Item = gix_hash::ObjectId> + 'a {
self.filter_map(|t| match t {
Ok(Token::Parent { id }) => Some(id),
_ => None,
})
}
/// Returns all signatures, first the author, then the committer, if there is no decoding error.
///
/// Errors are coerced into options, hiding whether there was an error or not. The caller knows if there was an error or not
/// if not exactly two signatures were iterable.
/// Errors are not the common case - if an error needs to be detectable, use this instance as iterator.
pub fn signatures(self) -> impl Iterator<Item = gix_actor::SignatureRef<'a>> + 'a {
self.filter_map(|t| match t {
Ok(Token::Author { signature } | Token::Committer { signature }) => Some(signature),
_ => None,
})
}
/// Returns the committer signature if there is no decoding error.
pub fn committer(mut self) -> Result<gix_actor::SignatureRef<'a>, crate::decode::Error> {
self.find_map(|t| match t {
Ok(Token::Committer { signature }) => Some(Ok(signature)),
Err(err) => Some(Err(err)),
_ => None,
})
.ok_or_else(missing_field)?
}
/// Returns the author signature if there is no decoding error.
///
/// It may contain white space surrounding it, and is exactly as parsed.
pub fn author(mut self) -> Result<gix_actor::SignatureRef<'a>, crate::decode::Error> {
self.find_map(|t| match t {
Ok(Token::Author { signature }) => Some(Ok(signature)),
Err(err) => Some(Err(err)),
_ => None,
})
.ok_or_else(missing_field)?
}
/// Returns the message if there is no decoding error.
///
/// It may contain white space surrounding it, and is exactly as
// parsed.
pub fn message(mut self) -> Result<&'a BStr, crate::decode::Error> {
self.find_map(|t| match t {
Ok(Token::Message(msg)) => Some(Ok(msg)),
Err(err) => Some(Err(err)),
_ => None,
})
.transpose()
.map(Option::unwrap_or_default)
}
}
fn missing_field() -> crate::decode::Error {
crate::decode::empty_error()
}
impl<'a> CommitRefIter<'a> {
fn next_inner(i: &'a [u8], state: &mut State) -> Result<(&'a [u8], Token<'a>), crate::decode::Error> {
use State::*;
Ok(match state {
Tree => {
let (i, tree) = context("tree <40 lowercase hex char>", |i| {
parse::header_field(i, b"tree", parse::hex_hash)
})(i)?;
*state = State::Parents;
(
i,
Token::Tree {
id: ObjectId::from_hex(tree).expect("parsing validation"),
},
)
}
Parents => {
let (i, parent) = context(
"commit <40 lowercase hex char>",
opt(|i| parse::header_field(i, b"parent", parse::hex_hash)),
)(i)?;
match parent {
Some(parent) => (
i,
Token::Parent {
id: ObjectId::from_hex(parent).expect("parsing validation"),
},
),
None => {
*state = State::Signature {
of: SignatureKind::Author,
};
return Self::next_inner(i, state);
}
}
}
Signature { ref mut of } => {
let who = *of;
let (field_name, err_msg) = match of {
SignatureKind::Author => {
*of = SignatureKind::Committer;
(&b"author"[..], "author <signature>")
}
SignatureKind::Committer => {
*state = State::Encoding;
(&b"committer"[..], "committer <signature>")
}
};
let (i, signature) = context(err_msg, |i| parse::header_field(i, field_name, parse::signature))(i)?;
(
i,
match who {
SignatureKind::Author => Token::Author { signature },
SignatureKind::Committer => Token::Committer { signature },
},
)
}
Encoding => {
let (i, encoding) = context(
"encoding <encoding>",
opt(|i| parse::header_field(i, b"encoding", is_not(NL))),
)(i)?;
*state = State::ExtraHeaders;
match encoding {
Some(encoding) => (i, Token::Encoding(encoding.as_bstr())),
None => return Self::next_inner(i, state),
}
}
ExtraHeaders => {
let (i, extra_header) = context(
"<field> <single-line|multi-line>",
opt(alt((
|i| parse::any_header_field_multi_line(i).map(|(i, (k, o))| (i, (k.as_bstr(), Cow::Owned(o)))),
|i| {
parse::any_header_field(i, is_not(NL))
.map(|(i, (k, o))| (i, (k.as_bstr(), Cow::Borrowed(o.as_bstr()))))
},
))),
)(i)?;
match extra_header {
Some(extra_header) => (i, Token::ExtraHeader(extra_header)),
None => {
*state = State::Message;
return Self::next_inner(i, state);
}
}
}
Message => {
let (i, message) = all_consuming(decode::message)(i)?;
debug_assert!(
i.is_empty(),
"we should have consumed all data - otherwise iter may go forever"
);
return Ok((i, Token::Message(message)));
}
})
}
}
impl<'a> Iterator for CommitRefIter<'a> {
type Item = Result<Token<'a>, crate::decode::Error>;
fn next(&mut self) -> Option<Self::Item> {
if self.data.is_empty() {
return None;
}
match Self::next_inner(self.data, &mut self.state) {
Ok((data, token)) => {
self.data = data;
Some(Ok(token))
}
Err(err) => {
self.data = &[];
Some(Err(err))
}
}
}
}
/// A token returned by the [commit iterator][CommitRefIter].
#[allow(missing_docs)]
#[derive(PartialEq, Eq, Debug, Hash, Ord, PartialOrd, Clone)]
pub enum Token<'a> {
Tree {
id: ObjectId,
},
Parent {
id: ObjectId,
},
/// A person who authored the content of the commit.
Author {
signature: gix_actor::SignatureRef<'a>,
},
/// A person who committed the authors work to the repository.
Committer {
signature: gix_actor::SignatureRef<'a>,
},
Encoding(&'a BStr),
ExtraHeader((&'a BStr, Cow<'a, BStr>)),
Message(&'a BStr),
}
impl<'a> Token<'a> {
/// Return the object id of this token if its a [tree][Token::Tree] or a [parent commit][Token::Parent].
pub fn id(&self) -> Option<&oid> {
match self {
Token::Tree { id } | Token::Parent { id } => Some(id.as_ref()),
_ => None,
}
}
/// Return the owned object id of this token if its a [tree][Token::Tree] or a [parent commit][Token::Parent].
pub fn try_into_id(self) -> Option<ObjectId> {
match self {
Token::Tree { id } | Token::Parent { id } => Some(id),
_ => None,
}
}
}