ec968198b9
Postfix adjustment hints # Basic Description This PR implements "postfix" adjustment hints: ![2022-12-21_19-27](https://user-images.githubusercontent.com/38225716/208941721-d48d316f-a918-408a-9757-8d4e2b402a66.png) They are identical to normal adjustment hints, but are rendered _after_ the expression. E.g. `expr.*` instead of `*expr`. ~~This mirrors "postfix deref" feature that I'm planning to eventually propose to the compiler.~~ # Motivation The advantage of being postfix is that you need to add parentheses less often: ![2022-12-21_19-38](https://user-images.githubusercontent.com/38225716/208944302-16718112-14a4-4438-8aed-797766391c63.png) ![2022-12-21_19-37](https://user-images.githubusercontent.com/38225716/208944281-d9614888-6597-41ee-bf5d-a081d8048f94.png) This is because a lot of "reborrow" hints are caused by field access or method calls, both of which are postfix and have higher "precedence" than prefix `&` and `*`. Also IMHO it just looks nicer and it's more clear what is happening (order of operations). # Modes However, there are some cases where postfix hints need parentheses but prefix don't (for example `&x` being turned into `(&x).*.*.&` or `&**&x`). This PR allows users to choose which look they like more. There are 4 options (`rust-analyzer.inlayHints.expressionAdjustmentHints.mode` setting): - `prefix` — always use prefix hints (default, what was used before that PR) - `postfix` — always use postfix hints - `prefer_prefix` — try to minimize number of parentheses, breaking ties in favor of prefix - `prefer_postfix` — try to minimize number of parentheses, breaking ties in favor of postfix Comparison of all modes: ![2022-12-21_19-53](https://user-images.githubusercontent.com/38225716/208947482-26357c82-2b42-47d9-acec-835f5f03f6b4.png) ![2022-12-21_19-49](https://user-images.githubusercontent.com/38225716/208946731-fe566d3b-52b2-4846-994d-c2cecc769e0f.png) ![2022-12-21_19-48](https://user-images.githubusercontent.com/38225716/208946742-6e237f44-805e-469a-a3db-03d8f76e1317.png) ![2022-12-21_19-47](https://user-images.githubusercontent.com/38225716/208946747-79f25fae-e3ea-47d2-8d27-cb4eeac034fe.png) # Edge cases Where are some rare cases where chain hints weirdly interact with adjustment hints, for example (note `SourceAnalyzer.&`): ![image](https://user-images.githubusercontent.com/38225716/208947958-41c12971-f1f0-4a41-a930-47939cce9f58.png) This is pre-existing, you can get the same effect with prefix hints (`SourceAnalyzer)`). ---- Another weird thing is this: ![2022-12-21_20-00](https://user-images.githubusercontent.com/38225716/208948590-ea26d325-2108-4b35-abaa-716a65a1ae99.png) Here `.&` is a hint and `?` is written in the source code. It looks like `?` is part of the hint because `?.` is ligature in my font. IMO this is a bug in vscode, but still worth mentioning (I'm also too lazy to report it there...). # Fixed bugs I've used the "needs parens" API and this accidentally fixed a bug with parens around `as`, see the test diff: ```diff,rust let _: *const u32 = &mut 0u32 as *mut u32; //^^^^^^^^^^^^^^^^^^^^^<mut-ptr-to-const-ptr> + //^^^^^^^^^^^^^^^^^^^^^( + //^^^^^^^^^^^^^^^^^^^^^) ... let _: *const u32 = &mut 0u32 as *mut u32; //^^^^^^^^^^^^^^^^^^^^^<mut-ptr-to-const-ptr> + //^^^^^^^^^^^^^^^^^^^^^( + //^^^^^^^^^^^^^^^^^^^^^) ``` # Changelog changelog feature Add an option to make adjustment hints (aka reborrow hints) postfix changelog fix Fix placement of parentheses around `as` casts for adjustment hints |
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base-db | ||
cfg | ||
flycheck | ||
hir | ||
hir-def | ||
hir-expand | ||
hir-ty | ||
ide | ||
ide-assists | ||
ide-completion | ||
ide-db | ||
ide-diagnostics | ||
ide-ssr | ||
limit | ||
mbe | ||
parser | ||
paths | ||
proc-macro-api | ||
proc-macro-srv | ||
proc-macro-srv-cli | ||
proc-macro-test | ||
profile | ||
project-model | ||
rust-analyzer | ||
sourcegen | ||
stdx | ||
syntax | ||
test-utils | ||
text-edit | ||
toolchain | ||
tt | ||
vfs | ||
vfs-notify |