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annotate rust/hg-core/src/config/values.rs @ 47350:04d1f17f49e7

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dirstate-v2: Write .hg/dirstate back to disk on directory cache changes Differential Revision: https://phab.mercurial-scm.org/D10827
author Simon Sapin <simon.sapin@octobus.net>
date Mon, 31 May 2021 18:35:44 +0200
parents 1b7c0b10d930
children 6961eca0b3ee
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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a687a7f27951 rust: Move config value parsing functions to a new module
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1 //! Parsing functions for various type of configuration values.
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2 //!
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3 //! Returning `None` indicates a syntax error. Using a `Result` would be more
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4 //! correct but would take more boilerplate for converting between error types,
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5 //! compared to using `.ok()` on inner results of various error types to
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6 //! convert them all to options. The `Config::get_parse` method later converts
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7 //! those options to results with `ConfigValueParseError`, which contains
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8 //! details about where the value came from (but omits details of what’s
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9 //! invalid inside the value).
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10
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11 pub(super) fn parse_bool(v: &[u8]) -> Option<bool> {
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12 match v.to_ascii_lowercase().as_slice() {
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13 b"1" | b"yes" | b"true" | b"on" | b"always" => Some(true),
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14 b"0" | b"no" | b"false" | b"off" | b"never" => Some(false),
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15 _ => None,
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16 }
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17 }
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18
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19 pub(super) fn parse_byte_size(value: &[u8]) -> Option<u64> {
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20 let value = std::str::from_utf8(value).ok()?.to_ascii_lowercase();
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21 const UNITS: &[(&str, u64)] = &[
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22 ("g", 1 << 30),
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23 ("gb", 1 << 30),
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24 ("m", 1 << 20),
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25 ("mb", 1 << 20),
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26 ("k", 1 << 10),
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27 ("kb", 1 << 10),
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28 ("b", 1 << 0), // Needs to be last
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29 ];
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30 for &(unit, multiplier) in UNITS {
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31 // TODO: use `value.strip_suffix(unit)` when we require Rust 1.45+
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32 if value.ends_with(unit) {
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33 let value_before_unit = &value[..value.len() - unit.len()];
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34 let float: f64 = value_before_unit.trim().parse().ok()?;
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35 if float >= 0.0 {
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36 return Some((float * multiplier as f64).round() as u64);
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37 } else {
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38 return None;
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39 }
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40 }
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41 }
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42 value.parse().ok()
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43 }
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44
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45 #[test]
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46 fn test_parse_byte_size() {
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47 assert_eq!(parse_byte_size(b""), None);
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48 assert_eq!(parse_byte_size(b"b"), None);
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49
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50 assert_eq!(parse_byte_size(b"12"), Some(12));
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51 assert_eq!(parse_byte_size(b"12b"), Some(12));
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52 assert_eq!(parse_byte_size(b"12 b"), Some(12));
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53 assert_eq!(parse_byte_size(b"12.1 b"), Some(12));
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54 assert_eq!(parse_byte_size(b"1.1 K"), Some(1126));
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55 assert_eq!(parse_byte_size(b"1.1 kB"), Some(1126));
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56
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57 assert_eq!(parse_byte_size(b"-12 b"), None);
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58 assert_eq!(parse_byte_size(b"-0.1 b"), None);
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59 assert_eq!(parse_byte_size(b"0.1 b"), Some(0));
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60 assert_eq!(parse_byte_size(b"12.1 b"), Some(12));
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61 }