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annotate rust/hg-core/src/revset.rs @ 46606:c692384bb559

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copies: rearrange all value comparison conditional To properly handle the newly tested case (chaining of merges) we will need to detect more accurately when an actualy merging of the copy information (and superseed the two existing data). Before starting to do so, we need to reorganise the values comparison to introduce different conditional branches when such actual merging is needed/detected. To avoid mixing too many change in this complicated code, we do the reorganisation before adding the "overwrite detection" logic in the next changesets. Differential Revision: https://phab.mercurial-scm.org/D9612
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Mon, 14 Dec 2020 19:26:33 +0100
parents 4b381dbbf8b7
children df247f58ecee
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1 //! The revset query language
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2 //!
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3 //! <https://www.mercurial-scm.org/repo/hg/help/revsets>
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4
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5 use crate::repo::Repo;
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6 use crate::revlog::changelog::Changelog;
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7 use crate::revlog::revlog::{Revlog, RevlogError};
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8 use crate::revlog::NodePrefix;
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9 use crate::revlog::{Revision, NULL_REVISION};
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10
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11 /// Resolve a query string into a single revision.
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12 ///
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13 /// Only some of the revset language is implemented yet.
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14 pub fn resolve_single(
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15 input: &str,
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16 repo: &Repo,
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17 ) -> Result<Revision, RevlogError> {
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18 let changelog = Changelog::open(repo)?;
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19
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20 match resolve_rev_number_or_hex_prefix(input, &changelog.revlog) {
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21 Err(RevlogError::InvalidRevision) => {} // Try other syntax
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22 result => return result,
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23 }
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24
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25 if input == "null" {
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26 return Ok(NULL_REVISION);
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27 }
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28
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29 // TODO: support for the rest of the language here.
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30
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31 Err(RevlogError::InvalidRevision)
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32 }
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33
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34 /// Resolve the small subset of the language suitable for revlogs other than
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35 /// the changelog, such as in `hg debugdata --manifest` CLI argument.
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36 ///
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37 /// * A non-negative decimal integer for a revision number, or
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38 /// * An hexadecimal string, for the unique node ID that starts with this
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39 /// prefix
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40 pub fn resolve_rev_number_or_hex_prefix(
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41 input: &str,
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42 revlog: &Revlog,
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43 ) -> Result<Revision, RevlogError> {
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44 if let Ok(integer) = input.parse::<i32>() {
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45 if integer >= 0 && revlog.has_rev(integer) {
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46 return Ok(integer);
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47 }
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48 }
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49 if let Ok(prefix) = NodePrefix::from_hex(input) {
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50 return revlog.get_node_rev(prefix);
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51 }
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52 Err(RevlogError::InvalidRevision)
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53 }