Module eval 

Structs

CompiledFilter

A validated filter compiled for repeated evaluation. Compile once per digest, evaluate per record.

DecodeLimits

Bounds on decoding one payload. Checked before the payload is parsed.

FilterRecord

One record as the evaluator sees it. Headers are read only when the filter has header predicates, so a caller may pass them lazily decoded. Header keys and values are borrowed, so a caller does not copy them per record.

HeaderRef

One user header of a record, borrowed from wherever the caller holds it.

Enums

HeaderNeed

What a caller decodes from a record’s header block before evaluating.

HeaderValueRef

A typed user header value, borrowed. Mirrors HeaderScalar.

Functions

decode_json

Decode a JSON payload within limits. The depth is checked by a scan over the raw bytes before any value is built, so a hostile payload cannot make the parser recurse or allocate past the limit.