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Hugh Kaznowski 1d3bc0d0d6 Merge branch 'worktree-agent-a63474e92b05425a5'

# Conflicts:
#	Cargo.lock
#	Cargo.toml

2026-09-05 12:46:45 +01:00

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005 — FilterBar query language (pest grammar)

Summary

Build the syntax-aware search language described in the README's FilterBar section, using pest, supporting regex searches and metric comparisons combined with boolean operators.

Scope

Add pest + pest_derive dependencies.
Grammar covering:
- regex("...") — raw-text regex search over log lines.
- metric_name[param] <op> value comparisons (<, >, <=, >=, ==, !=) — metric_name[param]<5 per the README example.
- sequence and timestamp as reserved metric names usable the same way (sequence<5, timestamp>12:00).
- Boolean combinators and / or with standard precedence, e.g. regex("error") and sequence<5 or timestamp>12:00.
Parse into an AST (not directly into engine queries — that's 007).
Surface parse errors with position info suitable for showing under the FilterBar input.

Acceptance criteria

Grammar test cases cover: bare regex, single metric comparison, reserved-metric comparison, and/or combinations with correct precedence, and at least one malformed-input case producing a located error rather than a panic.
Parser is a standalone module with no dependency on the engine/index types, so it can be unit tested in isolation.

Depends on

None directly, but the metric-comparison side of the grammar is only meaningful once 002 exists — build/test this ticket against metric names as opaque strings.

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