/
parse.rs
199 lines (179 loc) · 6.85 KB
/
parse.rs
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#[derive(Debug, thiserror::Error)]
pub enum Error {
#[error("Empty refspecs are invalid")]
Empty,
#[error("Negative refspecs cannot have destinations as they exclude sources")]
NegativeWithDestination,
#[error("Cannot push into an empty destination")]
PushToEmpty,
#[error("glob patterns may only involved a single '*' character, found {pattern:?}")]
PatternUnsupported { pattern: bstr::BString },
#[error("Both sides of the specification need a pattern, like 'a/*:b/*'")]
PatternUnbalanced,
#[error(transparent)]
ReferenceName(#[from] git_validate::refname::Error),
#[error(transparent)]
RevSpec(#[from] git_revision::spec::parse::Error),
}
pub(crate) mod function {
use crate::parse::Error;
use crate::{Mode, Operation, RefSpecRef};
use bstr::{BStr, ByteSlice};
/// Parse `spec` for use in `operation` and return it if it is valid.
pub fn parse(mut spec: &BStr, operation: Operation) -> Result<RefSpecRef<'_>, Error> {
fn fetch_head_only(mode: Mode) -> RefSpecRef<'static> {
RefSpecRef {
mode,
op: Operation::Fetch,
src: Some("HEAD".into()),
dst: None,
}
}
let mode = match spec.get(0) {
Some(&b'^') => {
spec = &spec[1..];
Mode::Negative
}
Some(&b'+') => {
spec = &spec[1..];
Mode::Force
}
Some(_) => Mode::Normal,
None => {
return match operation {
Operation::Push => Err(Error::Empty),
Operation::Fetch => Ok(fetch_head_only(Mode::Normal)),
}
}
};
let (src, dst) = match spec.find_byte(b':') {
Some(pos) => {
let (src, dst) = spec.split_at(pos);
let dst = &dst[1..];
if mode == Mode::Negative {
return Err(Error::NegativeWithDestination);
}
let src = (!src.is_empty()).then(|| src.as_bstr());
let dst = (!dst.is_empty()).then(|| dst.as_bstr());
match (src, dst) {
(None, None) => match operation {
Operation::Push => (None, None),
Operation::Fetch => (Some("HEAD".into()), None),
},
(None, Some(dst)) => match operation {
Operation::Push => (None, Some(dst)),
Operation::Fetch => (Some("HEAD".into()), Some(dst)),
},
(Some(src), None) => match operation {
Operation::Push => return Err(Error::PushToEmpty),
Operation::Fetch => (Some(src), None),
},
(Some(src), Some(dst)) => (Some(src), Some(dst)),
}
}
None => {
let src = (!spec.is_empty()).then(|| spec);
if Operation::Fetch == operation && src.is_none() {
return Ok(fetch_head_only(mode));
} else {
(src, None)
}
}
};
let (src, src_had_pattern) = validated(src, operation == Operation::Push)?;
let (dst, dst_had_pattern) = validated(dst, false)?;
if mode != Mode::Negative && src_had_pattern != dst_had_pattern {
return Err(Error::PatternUnbalanced);
}
Ok(RefSpecRef {
op: operation,
mode,
src,
dst,
})
}
fn validated(spec: Option<&BStr>, allow_revspecs: bool) -> Result<(Option<&BStr>, bool), Error> {
match spec {
Some(spec) => {
let glob_count = spec.iter().filter(|b| **b == b'*').take(2).count();
if glob_count == 2 {
return Err(Error::PatternUnsupported { pattern: spec.into() });
}
if glob_count == 1 {
let mut buf = smallvec::SmallVec::<[u8; 256]>::with_capacity(spec.len());
buf.extend_from_slice(&spec);
let glob_pos = buf.find_byte(b'*').expect("glob present");
buf[glob_pos] = b'a';
git_validate::reference::name_partial(buf.as_bstr())?;
} else {
git_validate::reference::name_partial(spec)
.map_err(Error::from)
.or_else(|err| {
if allow_revspecs {
match git_revision::spec::parse(spec, &mut super::revparse::Noop) {
Ok(_) => {
if spec.iter().any(|b| b.is_ascii_whitespace()) {
Err(err)
} else {
Ok(spec)
}
}
Err(err) => Err(err.into()),
}
} else {
Err(err)
}
})?;
}
Ok((Some(spec), glob_count == 1))
}
None => Ok((None, false)),
}
}
}
mod revparse {
use bstr::BStr;
use git_revision::spec::parse::delegate::{
Kind, Navigate, PeelTo, PrefixHint, ReflogLookup, Revision, SiblingBranch, Traversal,
};
pub(crate) struct Noop;
impl Revision for Noop {
fn find_ref(&mut self, _name: &BStr) -> Option<()> {
Some(())
}
fn disambiguate_prefix(&mut self, _prefix: git_hash::Prefix, _hint: Option<PrefixHint<'_>>) -> Option<()> {
Some(())
}
fn reflog(&mut self, _query: ReflogLookup) -> Option<()> {
Some(())
}
fn nth_checked_out_branch(&mut self, _branch_no: usize) -> Option<()> {
Some(())
}
fn sibling_branch(&mut self, _kind: SiblingBranch) -> Option<()> {
Some(())
}
}
impl Navigate for Noop {
fn traverse(&mut self, _kind: Traversal) -> Option<()> {
Some(())
}
fn peel_until(&mut self, _kind: PeelTo<'_>) -> Option<()> {
Some(())
}
fn find(&mut self, _regex: &BStr, _negated: bool) -> Option<()> {
Some(())
}
fn index_lookup(&mut self, _path: &BStr, _stage: u8) -> Option<()> {
Some(())
}
}
impl Kind for Noop {
fn kind(&mut self, _kind: git_revision::spec::Kind) -> Option<()> {
Some(())
}
}
impl git_revision::spec::parse::Delegate for Noop {
fn done(&mut self) {}
}
}