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use bstr::BStr;
use git_hash::{oid, ObjectId};
use nom::{
bytes::complete::take_while1,
character::is_alphabetic,
combinator::{all_consuming, opt},
error::{context, ParseError},
};
use crate::{bstr::ByteSlice, parse, parse::NL, tag::decode, Kind, TagRefIter};
pub(crate) enum State {
Target,
TargetKind,
Name,
Tagger,
Message,
}
impl Default for State {
fn default() -> Self {
State::Target
}
}
impl<'a> TagRefIter<'a> {
pub fn from_bytes(data: &'a [u8]) -> TagRefIter<'a> {
TagRefIter {
data,
state: State::default(),
}
}
pub fn target_id(&mut self) -> Option<ObjectId> {
self.next().and_then(Result::ok).and_then(Token::into_id)
}
}
impl<'a> TagRefIter<'a> {
fn next_inner(i: &'a [u8], state: &mut State) -> Result<(&'a [u8], Token<'a>), crate::decode::Error> {
use State::*;
Ok(match state {
Target => {
let (i, target) = context("object <40 lowercase hex char>", |i| {
parse::header_field(i, b"object", parse::hex_hash)
})(i)?;
*state = State::TargetKind;
(
i,
Token::Target {
id: ObjectId::from_hex(target).expect("parsing validation"),
},
)
}
TargetKind => {
let (i, kind) = context("type <object kind>", |i| {
parse::header_field(i, b"type", take_while1(is_alphabetic))
})(i)?;
let kind = crate::Kind::from_bytes(kind).map_err(|_| {
let err = crate::decode::ParseError::from_error_kind(i, nom::error::ErrorKind::MapRes);
nom::Err::Error(err)
})?;
*state = State::Name;
(i, Token::TargetKind(kind))
}
Name => {
let (i, tag_version) = context("tag <version>", |i| {
parse::header_field(i, b"tag", take_while1(|b| b != NL[0]))
})(i)?;
*state = State::Tagger;
(i, Token::Name(tag_version.as_bstr()))
}
Tagger => {
let (i, signature) = context(
"tagger <signature>",
opt(|i| parse::header_field(i, b"tagger", parse::signature)),
)(i)?;
*state = State::Message;
(i, Token::Tagger(signature))
}
Message => {
let (i, (message, pgp_signature)) = 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::Body { message, pgp_signature }));
}
})
}
}
impl<'a> Iterator for TagRefIter<'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))
}
}
}
}
#[allow(missing_docs)]
#[derive(PartialEq, Eq, Debug, Hash, Ord, PartialOrd, Clone)]
pub enum Token<'a> {
Target {
id: ObjectId,
},
TargetKind(Kind),
Name(&'a BStr),
Tagger(Option<git_actor::SignatureRef<'a>>),
Body {
message: &'a BStr,
pgp_signature: Option<&'a BStr>,
},
}
impl<'a> Token<'a> {
pub fn id(&self) -> Option<&oid> {
match self {
Token::Target { id } => Some(id.as_ref()),
_ => None,
}
}
pub fn into_id(self) -> Option<ObjectId> {
match self {
Token::Target { id } => Some(id),
_ => None,
}
}
}