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annotate rust/hg-core/src/revset.rs @ 48092:ddde80830aea

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rust-revset: add separate match logic for shortcuts The next change will add a shortcut for the `.` revision. One day we might start matching `tip` and others, so this is an easy refactor. Differential Revision: https://phab.mercurial-scm.org/D11401
author Rapha?l Gom?s <rgomes@octobus.net>
date Sat, 11 Sep 2021 00:05:08 +0200
parents 6f579618ea7b
children 3da7bf75fdb2
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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::errors::HgError;
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6 use crate::repo::Repo;
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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, WORKING_DIRECTORY_HEX};
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10 use crate::Node;
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11
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12 /// Resolve a query string into a single revision.
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13 ///
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14 /// Only some of the revset language is implemented yet.
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15 pub fn resolve_single(
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16 input: &str,
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17 repo: &Repo,
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18 ) -> Result<Revision, RevlogError> {
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19 let changelog = repo.changelog()?;
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20
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21 match input {
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22 "null" => return Ok(NULL_REVISION),
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23 _ => {}
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24 }
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25
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26 match resolve_rev_number_or_hex_prefix(input, &changelog.revlog) {
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27 Err(RevlogError::InvalidRevision) => {
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28 // TODO: support for the rest of the language here.
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29 let msg = format!("cannot parse revset '{}'", input);
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30 Err(HgError::unsupported(msg).into())
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31 }
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32 result => return result,
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33 }
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34 }
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35
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36 /// Resolve the small subset of the language suitable for revlogs other than
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37 /// the changelog, such as in `hg debugdata --manifest` CLI argument.
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38 ///
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39 /// * A non-negative decimal integer for a revision number, or
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40 /// * An hexadecimal string, for the unique node ID that starts with this
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41 /// prefix
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42 pub fn resolve_rev_number_or_hex_prefix(
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43 input: &str,
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44 revlog: &Revlog,
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45 ) -> Result<Revision, RevlogError> {
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46 // The Python equivalent of this is part of `revsymbol` in
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47 // `mercurial/scmutil.py`
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48
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49 if let Ok(integer) = input.parse::<i32>() {
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50 if integer.to_string() == input
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51 && integer >= 0
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52 && revlog.has_rev(integer)
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53 {
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54 return Ok(integer);
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55 }
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56 }
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57 if let Ok(prefix) = NodePrefix::from_hex(input) {
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58 if prefix.is_prefix_of(&Node::from_hex(WORKING_DIRECTORY_HEX).unwrap())
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59 {
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60 return Err(RevlogError::WDirUnsupported);
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61 }
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62 return revlog.rev_from_node(prefix);
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63 }
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64 Err(RevlogError::InvalidRevision)
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65 }