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[red-knot]: Add a VendoredFileSystem implementation (#11863)
Co-authored-by: Micha Reiser <micha@reiser.io>
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/// A number representing the revision of a file. | ||
/// | ||
/// Two revisions that don't compare equal signify that the file has been modified. | ||
/// Revisions aren't guaranteed to be monotonically increasing or in any specific order. | ||
/// | ||
/// Possible revisions are: | ||
/// * The last modification time of the file. | ||
/// * The hash of the file's content. | ||
/// * The revision as it comes from an external system, for example the LSP. | ||
#[derive(Copy, Clone, Debug, Eq, PartialEq)] | ||
pub struct FileRevision(u128); | ||
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impl FileRevision { | ||
pub fn new(value: u128) -> Self { | ||
Self(value) | ||
} | ||
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pub const fn zero() -> Self { | ||
Self(0) | ||
} | ||
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#[must_use] | ||
pub fn as_u128(self) -> u128 { | ||
self.0 | ||
} | ||
} | ||
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impl From<u128> for FileRevision { | ||
fn from(value: u128) -> Self { | ||
FileRevision(value) | ||
} | ||
} | ||
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impl From<u64> for FileRevision { | ||
fn from(value: u64) -> Self { | ||
FileRevision(u128::from(value)) | ||
} | ||
} | ||
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impl From<filetime::FileTime> for FileRevision { | ||
fn from(value: filetime::FileTime) -> Self { | ||
let seconds = value.seconds() as u128; | ||
let seconds = seconds << 64; | ||
let nanos = u128::from(value.nanoseconds()); | ||
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FileRevision(seconds | nanos) | ||
} | ||
} | ||
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#[cfg(test)] | ||
mod tests { | ||
use filetime::FileTime; | ||
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use super::*; | ||
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#[test] | ||
fn revision_from_file_time() { | ||
let file_time = FileTime::now(); | ||
let revision = FileRevision::from(file_time); | ||
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let revision = revision.as_u128(); | ||
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let nano = revision & 0xFFFF_FFFF_FFFF_FFFF; | ||
let seconds = revision >> 64; | ||
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assert_eq!(file_time.nanoseconds(), nano as u32); | ||
assert_eq!(file_time.seconds(), seconds as i64); | ||
} | ||
} |
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