Currently, if a predicate is hard to match on the Rust side, a sizable
query against a very large file can take forever, and ends up hanging.
This commit adds an API function `ts_query_cursor_set_timeout_micros` to
limit how long query execution is allowed to take, thereby negating the
chance of a hang to occur.
This resolves https://github.com/tree-sitter/tree-sitter/issues/3454.
This brings the usage of wasmtime::Engine in line with how wasmtime
intends it to be used. All wasmtime functions that receive an Engine
always receive an `&Engine`, never an owned `Engine`. They are always
responsible for cloning the reference if they need it.
This brings the usage of wasmtime::Engine in line with how TSParser
treats TSLanguages: when setting a language to the parser, the parser is
responsible for cloning the reference to the TSLanguage. It is
counterintuitive for TSParser to have different behavior when receiving
wasmtime_engine_t.
C API users also expect this behavior, see "Memory Management"
[here](https://docs.wasmtime.dev/c-api/wasm_8h.html). Talking about the
C API: without this change, failing to clone the `wasmtime_engine_t`
(which, again, is never something API users need to do in wasmtime) and
then reusing the engine in multiple TSLanguages results in a use after
free. With this change, failing to call `wasm_engine_delete` on your
owned Engine results in a memory leak. Memory leaks are safer than
use-after-free.
This commit stores the result of text predicates evaluation in a separate variable to ensure that they're computed just once. As is, it is possible for e.g. #match predicates to match node against a regex twice.
The `CARGO_MANIFEST_DIR` environment variable should be accessed by
`build.rs` at run time rather than compile time. This was for example
causing issues when importing `tree-sitter` via
[`rules_rust`](https://github.com/bazelbuild/rules_rust) in bazel,
where compilation and running happen in separate environments.
This patch updates the Rust binding's build script to output [build
metadata][links]. This makes it easier for downstream crates to
determine the include path, in case they need to compile their own C
code that requires the tree-sitter headers.
[links]: https://doc.rust-lang.org/cargo/reference/build-scripts.html#the-links-manifest-key
