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Add FilterBar query language parser (pest grammar)

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Introduces a standalone src/filter_parser.rs module (no dependency on
engine/index types) that parses the FilterBar query language into a
FilterExpr AST using a pest grammar (src/filter_parser.pest). Supports
regex("...") searches, metric_name[param] <op> value comparisons,
reserved sequence/timestamp metrics, and and/or combinators with
correct precedence (and binds tighter than or) and parenthesized
sub-expressions. Evaluation against real log data is left to a later
integration ticket.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XFUNZwCvz3kcod3352ZR2o
This commit is contained in:
Hugh Kaznowski
2026-09-05 12:45:31 +01:00
co-authored by Claude Sonnet 5
parent 1fb564d06b
commit 202b1dcf9f
5 changed files with 489 additions and 3 deletions
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Cargo.lock
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@@ -159,7 +159,7 @@ dependencies = [
"heck",
"proc-macro2",
"quote",
"syn",
"syn 3.0.5",
]
[[package]]
@@ -414,6 +414,8 @@ version = "0.1.0"
dependencies = [
"axum",
"clap",
"pest",
"pest_derive",
"serde",
"serde_json",
"tokio",
@@ -449,6 +451,48 @@ version = "2.3.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9b4f627cb1b25917193a259e49bdad08f671f8d9708acfd5fe0a8c1455d87220"
[[package]]
name = "pest"
version = "2.9.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "5a07a60cc7a4d00c91f95c685609d1d2f79050e6804b70ebedd7650f0b839bcf"
dependencies = [
"memchr",
"ucd-trie",
]
[[package]]
name = "pest_derive"
version = "2.9.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "b3a83744a5c8455b8b3e0dc5031362780a347c878bdd11584d1a8984228cc88d"
dependencies = [
"pest",
"pest_generator",
]
[[package]]
name = "pest_generator"
version = "2.9.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e0cd3451aa3de60d4b9a1e736885e4dea6b31617598026f12256ad566d63304a"
dependencies = [
"pest",
"pest_meta",
"proc-macro2",
"quote",
"syn 2.0.119",
]
[[package]]
name = "pest_meta"
version = "2.9.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e04d3a0849e241d7dfce834c83b1c5edc8622009e8dd51a12ba1927c32f05496"
dependencies = [
"pest",
]
[[package]]
name = "pin-project-lite"
version = "0.2.17"
@@ -521,7 +565,7 @@ checksum = "e7a5d71263a5a7d47b41f6b3f06ba276f10cc18b0931f1799f710578e2309348"
dependencies = [
"proc-macro2",
"quote",
"syn",
"syn 3.0.5",
]
[[package]]
@@ -598,6 +642,17 @@ version = "0.11.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f"
[[package]]
name = "syn"
version = "2.0.119"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "872831b642d1a07999a962a351ed35b955ea2cfc8f3862091e2a240a84f17297"
dependencies = [
"proc-macro2",
"quote",
"unicode-ident",
]
[[package]]
name = "syn"
version = "3.0.5"
@@ -640,7 +695,7 @@ checksum = "78773a2a397f451582ce068015985c33193cf6dea8b74d2a639fe457b2f07b0e"
dependencies = [
"proc-macro2",
"quote",
"syn",
"syn 3.0.5",
]
[[package]]
@@ -729,6 +784,12 @@ dependencies = [
"once_cell",
]
[[package]]
name = "ucd-trie"
version = "0.1.7"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "2896d95c02a80c6d6a5d6e953d479f5ddf2dfdb6a244441010e373ac0fb88971"
[[package]]
name = "unicase"
version = "2.9.0"