comparison rust/hg-core/src/revlog/node.rs @ 46429:e61c2dc6e1c2

rust: Exclude empty node prefixes

We presumably don’t want `--rev ""` to select every single revision,
even though the empty string is a prefix of all strings.

Differential Revision: https://phab.mercurial-scm.org/D9862

46428:5893706af3de

    /// To be used in FFI and I/O only, in order to facilitate future
    /// changes of hash format.
    pub fn from_hex(hex: impl AsRef<[u8]>) -> Result<Self, FromHexError> {
        let hex = hex.as_ref();
        let len = hex.len();
        if len > NODE_NYBBLES_LENGTH {
            return Err(FromHexError);
        }

        let is_odd = len % 2 == 1;
        let even_part = if is_odd { &hex[..len - 1] } else { hex };

        if self.is_odd {
            self.buf.len() * 2 - 1
        } else {
            self.buf.len() * 2
        }
    }

    pub fn is_empty(&self) -> bool {
        self.len() == 0
    }

    pub fn is_prefix_of(&self, node: &Node) -> bool {
        if self.is_odd {
            let buf = self.buf;

46429:e61c2dc6e1c2

    /// To be used in FFI and I/O only, in order to facilitate future
    /// changes of hash format.
    pub fn from_hex(hex: impl AsRef<[u8]>) -> Result<Self, FromHexError> {
        let hex = hex.as_ref();
        let len = hex.len();
        if len > NODE_NYBBLES_LENGTH || len == 0 {
            return Err(FromHexError);
        }

        let is_odd = len % 2 == 1;
        let even_part = if is_odd { &hex[..len - 1] } else { hex };

        if self.is_odd {
            self.buf.len() * 2 - 1
        } else {
            self.buf.len() * 2
        }
    }

    pub fn is_prefix_of(&self, node: &Node) -> bool {
        if self.is_odd {
            let buf = self.buf;