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parse.rs
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parse.rs
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use git_object::bstr::{BStr, BString};
use git_revision::spec;
#[derive(Default, Debug)]
struct Options {
reject_kind: bool,
}
#[derive(Default, Debug)]
struct Recorder {
resolve_ref_input: Option<BString>,
resolve_ref_input2: Option<BString>,
kind: Option<spec::Kind>,
calls: usize,
opts: Options,
}
impl Recorder {
fn with(options: Options) -> Self {
Recorder {
opts: options,
..Default::default()
}
}
}
impl spec::parse::Delegate for Recorder {
fn resolve_ref(&mut self, input: &BStr) -> Option<()> {
if self.resolve_ref_input.is_none() {
self.resolve_ref_input = input.to_owned().into();
} else if self.resolve_ref_input2.is_none() {
self.resolve_ref_input2 = input.to_owned().into();
} else {
panic!("called resolve_ref more than twice with '{}'", input);
}
self.calls += 1;
Some(())
}
fn find_by_prefix(&mut self, _input: &BStr) -> Option<()> {
todo!()
}
fn nth_ancestor(&mut self, _n: usize) -> Option<()> {
todo!()
}
fn nth_parent(&mut self, _n: usize) -> Option<()> {
todo!()
}
fn kind(&mut self, kind: spec::Kind) -> Option<()> {
if self.opts.reject_kind {
return None;
}
self.calls += 1;
self.kind = Some(kind);
Some(())
}
}
fn parse(spec: &str) -> Recorder {
try_parse_opts(spec, Options::default()).unwrap()
}
fn try_parse_opts(spec: &str, options: Options) -> Result<Recorder, spec::parse::Error> {
let mut rec = Recorder::with(options);
spec::parse(spec.into(), &mut rec)?;
Ok(rec)
}
#[test]
#[ignore]
fn empty_specs_are_valid() {
// they should of course be invalid for the delegate. CLIs may pre-process the input as well if they wish
// but git itself doesn't do that.
for spec in ["", " ", "\n\t"] {
let rec = parse(spec);
assert_eq!(rec.calls, 0);
}
}
#[test]
#[ignore]
fn all_characters_are_taken_verbatim_which_includes_whitespace() {
let spec = " HEAD \n";
let rec = parse(spec);
assert!(rec.kind.is_none());
assert_eq!(rec.resolve_ref_input.unwrap(), spec);
}
mod revision {
use crate::spec::parse::parse;
#[test]
fn at_by_iteself_is_shortcut_for_head() {
let rec = parse("@");
assert!(rec.kind.is_none());
assert_eq!(rec.resolve_ref_input.unwrap(), "HEAD");
}
#[test]
fn refname_head() {
let rec = parse("HEAD");
assert!(rec.kind.is_none());
assert_eq!(rec.resolve_ref_input.unwrap(), "HEAD");
}
#[test]
#[ignore]
fn refname_with_head_prefix() {
let rec = parse("HEADfake");
assert!(rec.kind.is_none());
assert_eq!(rec.resolve_ref_input.unwrap(), "HEADfake");
}
}
mod range {
use crate::spec::parse::{parse, try_parse_opts, Options};
use git_revision::spec;
#[test]
fn delegate_can_refuse_spec_kinds() {
let err = try_parse_opts("^HEAD", Options { reject_kind: true }).unwrap_err();
assert!(
matches!(err, spec::parse::Error::Delegate),
"Delegates can refuse spec kind changes to abort parsing early"
);
}
#[test]
fn leading_caret_is_range_kind() {
let rec = parse("^HEAD");
assert_eq!(rec.kind.unwrap(), spec::Kind::Range);
assert_eq!(rec.resolve_ref_input.unwrap(), "HEAD");
}
#[test]
fn trailing_dot_dot_is_range() {
let rec = parse("HEAD..");
assert_eq!(rec.kind.unwrap(), spec::Kind::Range);
assert_eq!(rec.resolve_ref_input.unwrap(), "HEAD");
}
#[test]
fn trailing_dot_dot_dot_is_merge_base() {
let rec = parse("HEAD...");
assert_eq!(rec.kind.unwrap(), spec::Kind::MergeBase);
assert_eq!(rec.resolve_ref_input.unwrap(), "HEAD");
}
#[test]
fn middle_dot_dot_dot_is_merge_base() {
let rec = parse("HEAD...@");
assert_eq!(rec.kind.unwrap(), spec::Kind::MergeBase);
assert_eq!(rec.resolve_ref_input.unwrap(), "HEAD");
assert_eq!(rec.resolve_ref_input2.unwrap(), "HEAD");
}
#[test]
fn middle_dot_dot_is_range() {
let rec = parse("@..HEAD");
assert_eq!(rec.kind.unwrap(), spec::Kind::Range);
assert_eq!(rec.resolve_ref_input.unwrap(), "HEAD");
assert_eq!(rec.resolve_ref_input2.unwrap(), "HEAD");
}
}