Problem: Installing treesitter parser is hard (harder than
climbing to heaven).
Solution: Add optional support for wasm parsers with `wasmtime`.
Notes:
* Needs to be enabled by setting `ENABLE_WASMTIME` for tree-sitter and
Neovim. Build with
`make CMAKE_EXTRA_FLAGS=-DENABLE_WASMTIME=ON
DEPS_CMAKE_FLAGS=-DENABLE_WASMTIME=ON`
* Adds optional Rust (obviously) and C11 dependencies.
* Wasmtime comes with a lot of features that can negatively affect
Neovim performance due to library and symbol table size. Make sure to
build with minimal features and full LTO.
* To reduce re-compilation times, install `sccache` and build with
`RUSTC_WRAPPER=<path/to/sccache> make ...`
Problem: `has-ancestor?` is O(n²) for the depth of the tree since it iterates over each of the node's ancestors (bottom-up), and each ancestor takes O(n) time.
This happens because tree-sitter's nodes don't store their parent nodes, and the tree is searched (top-down) each time a new parent is requested.
Solution: Make use of new `ts_node_child_containing_descendant()` in tree-sitter v0.22.6 (which is now the minimum required version) to rewrite the `has-ancestor?` predicate in C to become O(n).
For a sample file, decreases the time taken by `has-ancestor?` from 360ms to 6ms.
Problem:
`TSNode:_rawquery()` is complicated, has known issues and the Lua and
C code is awkwardly coupled (see logic with `active`).
Solution:
- Add `TSQueryCursor` and `TSQueryMatch` bindings.
- Replace `TSNode:_rawquery()` with `TSQueryCursor:next_capture()` and `TSQueryCursor:next_match()`
- Do more stuff in Lua
- API for `Query:iter_captures()` and `Query:iter_matches()` remains the same.
- `treesitter.c` no longer contains any logic related to predicates.
- Add `match_limit` option to `iter_matches()`. Default is still 256.
Query patterns can contain quantifiers (e.g. (foo)+ @bar), so a single
capture can map to multiple nodes. The iter_matches API can not handle
this situation because the match table incorrectly maps capture indices
to a single node instead of to an array of nodes.
The match table should be updated to map capture indices to an array of
nodes. However, this is a massively breaking change, so must be done
with a proper deprecation period.
`iter_matches`, `add_predicate` and `add_directive` must opt-in to the
correct behavior for backward compatibility. This is done with a new
"all" option. This option will become the default and removed after the
0.10 release.
Co-authored-by: Christian Clason <c.clason@uni-graz.at>
Co-authored-by: MDeiml <matthias@deiml.net>
Co-authored-by: Gregory Anders <greg@gpanders.com>
- `TSQuery`: userdata object for parsed query.
- `vim.treesitter.Query`: renamed from `Query`.
- Add a new field `lang`.
- `TSQueryInfo`:
- Move to `vim/treesitter/_meta.lua`, because C code owns it.
- Correct typing for `patterns`, should be a map from `integer`
(pattern_id) to `(integer|string)[][]` (list of predicates or
directives).
- `vim.treesitter.QueryInfo` is added.
- This currently has the same structure as `TSQueryInfo` (exported
from C code).
- Document the fields (see `TSQuery:inspect`).
- Add typing for `vim._ts_parse_query()`.
Problem:
With incremental injection parsing, injected languages' parsers parse
only the relevant regions and stores the result in _trees with the index
of the corresponding region. Therefore, there can be holes in _trees.
Solution:
* Use generic table functions where appropriate.
* Fix type annotations and docs.
According to `:h TSNode` docs, there's also `TSNode:sexpr()` and
`TSNode:has_error()` that is part of `TSNode` class, but this wasn't
documented in `treesitter/_meta.lua`.
Adding missing fields in so the types is similar to `:h TSNode`
Problem:
Treesitter highlighting is slow for large files with lots of injections.
Solution:
Only parse injections we are going to render during a redraw cycle.
---
- `LanguageTree:parse()` will no longer parse injections by default and
now requires an explicit range argument to be passed.
- `TSHighlighter` now parses injections incrementally during on_win
callbacks for the line range being rendered.
- Plugins which require certain injections to be parsed must run
`parser:parse({ start_row, end_row })` before using the tree.
- Add bindings to Treesitter ts_parser_set_logger and ts_parser_logger
- Add logfile with path STDPATH('log')/treesitter.c
- Rework existing LanguageTree loggin to use logfile
- Begin implementing log levels for vim.g.__ts_debug
