diff options
author | Kevin DeLorey <[email protected]> | 2020-02-09 16:25:47 +0000 |
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committer | Kevin DeLorey <[email protected]> | 2020-02-09 16:37:43 +0000 |
commit | a957c473fdb79880c39b73dc9e0c923093cf16ac (patch) | |
tree | f998b548f530ce604651e0e6af314ed2ec74b3b5 /crates/ra_ide_db/src/feature_flags.rs | |
parent | 22caf982b99c54058e2e9200aeea0e61cada284a (diff) | |
parent | 1b9b13b4b4a75b5531c3f046ce6bf72d681f2732 (diff) |
Merge branch 'master' into kdelorey/complete-trait-impl
Diffstat (limited to 'crates/ra_ide_db/src/feature_flags.rs')
-rw-r--r-- | crates/ra_ide_db/src/feature_flags.rs | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/crates/ra_ide_db/src/feature_flags.rs b/crates/ra_ide_db/src/feature_flags.rs new file mode 100644 index 000000000..1b3cabf4d --- /dev/null +++ b/crates/ra_ide_db/src/feature_flags.rs | |||
@@ -0,0 +1,71 @@ | |||
1 | //! See docs for `FeatureFlags`. | ||
2 | |||
3 | use rustc_hash::FxHashMap; | ||
4 | |||
5 | /// Feature flags hold fine-grained toggles for all *user-visible* features of | ||
6 | /// rust-analyzer. | ||
7 | /// | ||
8 | /// The exists such that users are able to disable any annoying feature (and, | ||
9 | /// with many users and many features, some features are bound to be annoying | ||
10 | /// for some users) | ||
11 | /// | ||
12 | /// Note that we purposefully use run-time checked strings, and not something | ||
13 | /// checked at compile time, to keep things simple and flexible. | ||
14 | /// | ||
15 | /// Also note that, at the moment, `FeatureFlags` also store features for | ||
16 | /// `ra_lsp_server`. This should be benign layering violation. | ||
17 | #[derive(Debug)] | ||
18 | pub struct FeatureFlags { | ||
19 | flags: FxHashMap<String, bool>, | ||
20 | } | ||
21 | |||
22 | impl FeatureFlags { | ||
23 | fn new(flags: &[(&str, bool)]) -> FeatureFlags { | ||
24 | let flags = flags | ||
25 | .iter() | ||
26 | .map(|&(name, value)| { | ||
27 | check_flag_name(name); | ||
28 | (name.to_string(), value) | ||
29 | }) | ||
30 | .collect(); | ||
31 | FeatureFlags { flags } | ||
32 | } | ||
33 | |||
34 | pub fn set(&mut self, flag: &str, value: bool) -> Result<(), ()> { | ||
35 | match self.flags.get_mut(flag) { | ||
36 | None => Err(()), | ||
37 | Some(slot) => { | ||
38 | *slot = value; | ||
39 | Ok(()) | ||
40 | } | ||
41 | } | ||
42 | } | ||
43 | |||
44 | pub fn get(&self, flag: &str) -> bool { | ||
45 | match self.flags.get(flag) { | ||
46 | None => panic!("unknown flag: {:?}", flag), | ||
47 | Some(value) => *value, | ||
48 | } | ||
49 | } | ||
50 | } | ||
51 | |||
52 | impl Default for FeatureFlags { | ||
53 | fn default() -> FeatureFlags { | ||
54 | FeatureFlags::new(&[ | ||
55 | ("lsp.diagnostics", true), | ||
56 | ("completion.insertion.add-call-parenthesis", true), | ||
57 | ("completion.enable-postfix", true), | ||
58 | ("notifications.workspace-loaded", true), | ||
59 | ("notifications.cargo-toml-not-found", true), | ||
60 | ]) | ||
61 | } | ||
62 | } | ||
63 | |||
64 | fn check_flag_name(flag: &str) { | ||
65 | for c in flag.bytes() { | ||
66 | match c { | ||
67 | b'a'..=b'z' | b'-' | b'.' => (), | ||
68 | _ => panic!("flag name does not match conventions: {:?}", flag), | ||
69 | } | ||
70 | } | ||
71 | } | ||