# jrsonnet-evaluator
Interpreter for parsed jsonnet tree
## Standard library
jsonnet stdlib is embedded into evaluator, but there is different modes for this:
- `codegenerated-stdlib`
- generates source code for reproducing stdlib AST ([Example](https://gist.githubusercontent.com/CertainLach/7b3149df556f3406f5e9368aaa9f32ec/raw/0c80d8ab9aa7b9288c6219a2779cb2ab37287669/a.rs))
- fastest on interpretation, slowest on compilation (it takes more than 5 minutes to optimize them by llvm)
- `serialized-stdlib`
- serializes standard library AST using serde
- slower than `codegenerated-stdlib` at runtime, but have no compilation speed penality
- none
- leaves only stdlib source code in binary, processing them same way as user supplied data
- slowest (as it involves parsing of standard library source code)
Because of `codegenerated-stdlib` compilation slowdown, `serialized-stdlib` is used by default
### Benchmark
Can also be run via `cargo bench`
```markdown
# codegenerated-stdlib
test tests::bench_codegen ... bench: 401,696 ns/iter (+/- 38,521)
# serialized-stdlib
test tests::bench_serialize ... bench: 1,763,999 ns/iter (+/- 76,211)
# none
test tests::bench_parse ... bench: 7,206,164 ns/iter (+/- 1,067,418)
```
## Intrinsics
Some functions from stdlib are implemented as intrinsics
### Intrinsic handling
If indexed jsonnet object has field '__intrinsic_namespace__' of type 'string', then any not found field/method is resolved as `Val::Intrinsic(__intrinsic_namespace__, name)`