loglarn

Loglarn is a hypothetical programming language and data-processing framework described in discussions of domain-specific languages for log analysis and educational tooling. It is presented as a compact, extensible core intended for teaching concepts of streaming data, pattern matching, and declarative querying, rather than as an established, real-world technology.

Etymology: The name blends “log” (log data) with “larn” (an old spelling of “learn”), signaling its purpose: to facilitate learning from log streams through a specialized language.

Design goals: Loglarn emphasizes readability and safety for log workflows, with a minimal, composable core, strong typing, and predictable evaluation. It targets streaming logs, event timestamps, and windowed aggregations, while supporting extension via macros and libraries.

Key features: first-class log events with typed fields; pattern matching over event records; time-based operators and windows; pipelined dataflow; optional immutability; and a small standard library for common log tasks such as filtering, grouping, and aggregation.

Example (illustrative): select events where level = "ERROR" and duration > 1000, aggregate by minute and count.

History and status: Loglarn appears in speculative literature and pedagogy as an illustrative DSL for log analysis; there is no formal specification or widely implemented interpreter. It is used as a teaching aid to compare DSL designs and to discuss how a language might structure log-centric workflows.

See also: Loglan, Lojban, Logstash, SQL-like query languages, and dataflow domain-specific languages.