json.nx

json.nx -- pull-style JSON parser (Phase G12, RFC 8259). Research / reference: RFC 8259 — The JavaScript Object Notation (JSON) Data Interchange Format Crockford 2002 — json.org, the original spec Design: pull-style / event-driven parser. The caller invokes json_next(p) in a loop; each call emits one event: JSON_NULL / JSON_BOOL / JSON_INT / JSON_STRING JSON_ARRAY_BEGIN / JSON_ARRAY_END JSON_OBJECT_BEGIN / JSON_OBJECT_END JSON_KEY (for object member names) JSON_END (end of input) JSON_ERROR (malformed input) Zero heap allocation per event. String values are returned as (start, len) slices into the original input buffer; the caller copies if they need persistence. Scope: RFC 8259 compliant for well-formed input. Skips whitespace per spec, supports \" \\ \/ \b \f \n \r \t escape sequences in strings. Number parsing handles integers; \uXXXX unicode escapes and fractional numbers deferred to a follow-up.