upstream/mercurial-mirror Files · rust/hg-core/src/lib.rs

rust-cpython: binding for LazyAncestors...

rust-cpython: binding for LazyAncestors The `mercurial.rustext.ancestor` module will not in the foreseeable future be a drop-in replacement for the pure `mercurial.ancestor`, because the Rust variants take the index at instantiation whereas the Python ones take a parents function. From the Python side, using the index from `ancestor` would leak internal details out of `mercurial.revlog`, and that's unwanted. Therefore, given that classes defined in `rust-cpython` have the same names in both language, we keep the Rust naming convention (CamelCase). Eventually, though, the ancestor module can be placed under control of `mercurial.policy`, but it will still be up to `revlog` to be aware of that and play the role of a factory for instantiation. Differential Revision: https://phab.mercurial-scm.org/D5441

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      // Copyright 2018 Georges Racinet <gracinet@anybox.fr>

      //

      // This software may be used and distributed according to the terms of the

      // GNU General Public License version 2 or any later version.

      mod ancestors;

      pub use ancestors::{AncestorsIterator, LazyAncestors, MissingAncestors};

      /// Mercurial revision numbers

      ///

      /// As noted in revlog.c, revision numbers are actually encoded in

      /// 4 bytes, and are liberally converted to ints, whence the i32

      pub type Revision = i32;

      pub const NULL_REVISION: Revision = -1;

      /// The simplest expression of what we need of Mercurial DAGs.

      pub trait Graph {

          /// Return the two parents of the given `Revision`.

          ///

          /// Each of the parents can be independently `NULL_REVISION`

          fn parents(&self, Revision) -> Result<[Revision; 2], GraphError>;

      }

      #[derive(Clone, Debug, PartialEq)]

      pub enum GraphError {

          ParentOutOfRange(Revision),

      }

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				// Copyright 2018 Georges Racinet <gracinet@anybox.fr>
				//
				// This software may be used and distributed according to the terms of the
				// GNU General Public License version 2 or any later version.
				mod ancestors;
				pub use ancestors::{AncestorsIterator, LazyAncestors, MissingAncestors};

				/// Mercurial revision numbers
				///
				/// As noted in revlog.c, revision numbers are actually encoded in
				/// 4 bytes, and are liberally converted to ints, whence the i32
				pub type Revision = i32;

				pub const NULL_REVISION: Revision = -1;

				/// The simplest expression of what we need of Mercurial DAGs.
				pub trait Graph {
				/// Return the two parents of the given `Revision`.
				///
				/// Each of the parents can be independently `NULL_REVISION`
				fn parents(&self, Revision) -> Result<[Revision; 2], GraphError>;
				}

				#[derive(Clone, Debug, PartialEq)]
				pub enum GraphError {
				ParentOutOfRange(Revision),
				}