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annotate rust/hg-core/src/revset.rs @ 46821:e8ae91b1a63d

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rhg: raise wdir specific error for `hg debugdata` Helps remove the conditional in `test-debugcommands.t` for rhg. Differential Revision: https://phab.mercurial-scm.org/D10254
author Pulkit Goyal <7895pulkit@gmail.com>
date Tue, 23 Mar 2021 19:58:49 +0530
parents df247f58ecee
children 21d25e9ee58e
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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::changelog::Changelog;
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8 use crate::revlog::revlog::{Revlog, RevlogError};
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9 use crate::revlog::NodePrefix;
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10 use crate::revlog::{Revision, NULL_REVISION, WORKING_DIRECTORY_HEX};
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11 use crate::Node;
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12
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13 /// Resolve a query string into a single revision.
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14 ///
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15 /// Only some of the revset language is implemented yet.
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16 pub fn resolve_single(
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17 input: &str,
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18 repo: &Repo,
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19 ) -> Result<Revision, RevlogError> {
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20 let changelog = Changelog::open(repo)?;
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21
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22 match resolve_rev_number_or_hex_prefix(input, &changelog.revlog) {
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23 Err(RevlogError::InvalidRevision) => {} // Try other syntax
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24 result => return result,
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25 }
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26
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27 if input == "null" {
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28 return Ok(NULL_REVISION);
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29 }
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31 // TODO: support for the rest of the language here.
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32
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33 Err(
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34 HgError::unsupported(format!("cannot parse revset '{}'", input))
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35 .into(),
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36 )
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37 }
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38
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39 /// Resolve the small subset of the language suitable for revlogs other than
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40 /// the changelog, such as in `hg debugdata --manifest` CLI argument.
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41 ///
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42 /// * A non-negative decimal integer for a revision number, or
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43 /// * An hexadecimal string, for the unique node ID that starts with this
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44 /// prefix
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45 pub fn resolve_rev_number_or_hex_prefix(
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46 input: &str,
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47 revlog: &Revlog,
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48 ) -> Result<Revision, RevlogError> {
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49 if let Ok(integer) = input.parse::<i32>() {
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50 if integer >= 0 && revlog.has_rev(integer) {
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51 return Ok(integer);
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52 }
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53 }
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54 if let Ok(prefix) = NodePrefix::from_hex(input) {
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55 if prefix.is_prefix_of(&Node::from_hex(WORKING_DIRECTORY_HEX).unwrap())
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56 {
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57 return Err(RevlogError::WDirUnsupported);
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58 }
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59 return revlog.get_node_rev(prefix);
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60 }
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61 Err(RevlogError::InvalidRevision)
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62 }