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comparison rust/hg-core/src/revset.rs @ 46433:4b381dbbf8b7

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rhg: centralize parsing of `--rev` CLI arguments This new module will be the place to implement more of the revset language when we do so. Differential Revision: https://phab.mercurial-scm.org/D9873
author Simon Sapin <simon.sapin@octobus.net>
date Tue, 26 Jan 2021 18:31:46 +0100
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children df247f58ecee
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46432:18a261b11b20 46433:4b381dbbf8b7
1 //! The revset query language
2 //!
3 //! <https://www.mercurial-scm.org/repo/hg/help/revsets>
4
5 use crate::repo::Repo;
6 use crate::revlog::changelog::Changelog;
7 use crate::revlog::revlog::{Revlog, RevlogError};
8 use crate::revlog::NodePrefix;
9 use crate::revlog::{Revision, NULL_REVISION};
10
11 /// Resolve a query string into a single revision.
12 ///
13 /// Only some of the revset language is implemented yet.
14 pub fn resolve_single(
15 input: &str,
16 repo: &Repo,
17 ) -> Result<Revision, RevlogError> {
18 let changelog = Changelog::open(repo)?;
19
20 match resolve_rev_number_or_hex_prefix(input, &changelog.revlog) {
21 Err(RevlogError::InvalidRevision) => {} // Try other syntax
22 result => return result,
23 }
24
25 if input == "null" {
26 return Ok(NULL_REVISION);
27 }
28
29 // TODO: support for the rest of the language here.
30
31 Err(RevlogError::InvalidRevision)
32 }
33
34 /// Resolve the small subset of the language suitable for revlogs other than
35 /// the changelog, such as in `hg debugdata --manifest` CLI argument.
36 ///
37 /// * A non-negative decimal integer for a revision number, or
38 /// * An hexadecimal string, for the unique node ID that starts with this
39 /// prefix
40 pub fn resolve_rev_number_or_hex_prefix(
41 input: &str,
42 revlog: &Revlog,
43 ) -> Result<Revision, RevlogError> {
44 if let Ok(integer) = input.parse::<i32>() {
45 if integer >= 0 && revlog.has_rev(integer) {
46 return Ok(integer);
47 }
48 }
49 if let Ok(prefix) = NodePrefix::from_hex(input) {
50 return revlog.get_node_rev(prefix);
51 }
52 Err(RevlogError::InvalidRevision)
53 }