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| author | bors[bot] <26634292+bors[bot]@users.noreply.github.com> | 2019-11-09 09:13:14 +0000 |
|---|---|---|
| committer | GitHub <[email protected]> | 2019-11-09 09:13:14 +0000 |
| commit | 561bb979cecd786f5d311ea7bddb1e15d77a3848 (patch) | |
| tree | a6aaa81c3acbfc5e6add5ebbee9abbc0f8357014 /docs | |
| parent | 23939cabcc10ecc045a97361df182b9b4db32953 (diff) | |
| parent | 0a5ec69404a2556dd82e5bb00b295aebaa291f04 (diff) | |
Merge #2169
2169: MBE: Mapping spans for goto definition r=matklad a=edwin0cheng
Currently, go to definition gives the wrong span in MBE. This PR implement a mapping mechanism to fix it and it could be used for future MBE hygiene implementation.
The basic idea of the mapping is:
1. When expanding the macro, generated 2 `TokenMap` which maps the macro args and macro defs between tokens and input text-ranges.
2. Before converting generated `TokenTree` to `SyntaxNode`, generated a `ExpandedRangeMap` which is a mapping between token and output text-ranges.
3. Using these 3 mappings to construct an `ExpansionInfo` which can map between input text ranges and output text ranges.
Co-authored-by: Edwin Cheng <[email protected]>
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