gnata: initial release

Pure-Go implementation of JSONata 2.x, built for high-throughput
streaming evaluation.

Features:
- Full JSONata 2.x language support (1,273 test cases from the
  official jsonata-js suite)
- Two-tier evaluation: GJSON zero-copy fast path for simple
  expressions, full AST walk for complex ones
- Lock-free StreamEvaluator for batched concurrent evaluation
- Schema-aware GroupPlan caching with bounded FIFO ring buffer
- WASM build target for browser use
- Single external dependency (tidwall/gjson)

Copyright (c) 2026 RecoLabs Inc.
Licensed under the MIT License.

Signed-off-by: NirBarak-RecoLabs <nirb@recolabs.ai>

Author: NirBarak-RecoLabs

.github/workflows/ci.yml

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+name: CI
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+      - run: go test -race -count=1 ./...
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+      - uses: golangci/golangci-lint-action@v9
+        with:
+          version: latest

.gitignore

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+*.wasm
+.secret
+.DS_Store

.golangci.yaml

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+version: "2"
+linters:
+  enable:
+  - asasalint
+  - asciicheck
+  - bidichk
+  - copyloopvar
+  - decorder
+  - dogsled
+  - dupl
+  - dupword
+  - durationcheck
+  - errchkjson
+  - errname
+  - errorlint
+  - exhaustive
+  - exptostd
+  - fatcontext
+  - funlen
+  - goconst
+  - gocritic
+  - gocyclo
+  - goprintffuncname
+  - gosec
+  - gosmopolitan
+  - grouper
+  - iface
+  - intrange
+  - iotamixing
+  - lll
+  - makezero
+  - misspell
+  - modernize
+  - nakedret
+  - nilerr
+  - nilnesserr
+  - nolintlint
+  - nosprintfhostport
+  - prealloc
+  - predeclared
+  - reassign
+  - recvcheck
+  - revive
+  - sloglint
+  - staticcheck
+  - testableexamples
+  - testifylint
+  - unconvert
+  - unparam
+  - usestdlibvars
+  - usetesting
+  - wastedassign
+  - whitespace
+  settings:
+    funlen:
+      lines: 100
+      statements: 50
+    gocritic:
+      enabled-tags:
+      - diagnostic
+      - experimental
+      - opinionated
+      - performance
+      - style
+    lll:
+      line-length: 140
+    revive:
+      rules:
+      - name: var-naming
+        disabled: true
+  exclusions:
+    presets:
+    - comments
+    - common-false-positives
+    - legacy
+    - std-error-handling
+    rules:
+    - path: (.+)\.go$
+      text: G101
+    - path: (.+)\.go$
+      text: G404
+    - path: (.+)\.go$
+      text: G115
+    - path: (.+)\.go$
+      text: Error return value of `.*log.*ger.*\.Log` is not checked
+    paths:
+    - third_party$
+    - builtin$
+    - examples$
+issues:
+  fix: true
+formatters:
+  enable:
+  - gci
+  - gofmt
+  - gofumpt
+  - goimports
+  exclusions:
+    paths:
+    - third_party$
+    - builtin$
+    - examples$

AGENTS.md

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+# AGENTS.md
+
+This file provides guidance to AI agents (Claude Code, GitHub Copilot, Cursor, etc.) when working with code in this repository.
+
+## What Is Gnata
+
+Gnata is a full JSONata 2.x implementation in Go, built for production streaming workloads. JSONata is a query and transformation language for JSON data. Gnata provides two-tier evaluation: fast-path (GJSON zero-copy) for simple expressions and full AST evaluation for complex ones, plus a lock-free `StreamEvaluator` for high-throughput batched evaluation.
+
+## Development Commands
+
+```sh
+# Lint (from package root)
+golangci-lint run
+
+# Run all tests (1,273 JSON test cases from official jsonata-js suite + unit tests)
+go test ./...
+
+# Run a single test
+go test -run TestName
+
+# Run benchmarks
+go test -bench=. -benchmem
+```
+
+## Architecture
+
+### Compilation Pipeline
+
+Lexer → Parser → AST Processing → Fast-Path Analysis → Expression
+
+1. **Lexer** (`internal/lexer/`) — Tokenizes JSONata expression strings
+2. **Parser** (`internal/parser/`) — Pratt (top-down operator precedence) parser producing AST nodes
+3. **AST Processing** (`parser.ProcessAST`) — Normalizes and optimizes the AST
+4. **Fast-Path Analysis** (`parser.AnalyzeFastPath`) — Classifies expressions into:
+   - Pure-path fast path (e.g., `Account.Name`) — uses GJSON zero-copy
+   - Comparison fast path (e.g., `a.b = "x"`) — zero allocations
+   - Full AST evaluation required
+
+### Two-Tier Evaluation
+
+- `Eval(ctx, any)` — Evaluate against pre-parsed Go values via full AST walk
+- `EvalBytes(ctx, json.RawMessage)` — Fast-path expressions use GJSON directly on raw JSON bytes; full-path falls back to unmarshal + Eval
+
+### StreamEvaluator (stream.go)
+
+Batch-evaluates multiple expressions against events. Schema-keyed `GroupPlan` caching deduplicates field extraction across expressions. Lock-free reads via `atomic.Pointer` snapshot; writes serialized by `sync.Mutex`. Single JSON scan per event via `gjson.GetManyBytes`.
+
+### Evaluator Dispatch (internal/evaluator/)
+
+`evaluator.Eval(node, input, env)` dispatches by `node.Type`. Each eval category is in its own file:
+- `eval_binary.go` — Binary operators, subscripts, filtering
+- `eval_function.go` — Function calls, lambdas, partial application
+- `eval_chain.go` — Path chaining, pipes, blocks, conditions
+- `eval_sort.go` — Sorting with generic `SortItemsErr[T any]` helper
+- `eval_transform.go` — JSONata transform operator (`|obj|updates|deletes|` syntax)
+- `eval_group.go` — Group-by reduction (`{key: val}` syntax)
+- `eval_range.go` — Range operator (`[start..end]`)
+- `eval_regex.go` — Regex compilation and matching
+- `eval_unary.go` — Unary operators (negation, array constructor)
+
+### Standard Library (functions/)
+
+55+ built-in JSONata functions across categorized files: `string_funcs.go`, `string_match_replace.go`, `string_format_number.go`, `string_format_integer.go`, `string_encoding.go`, `numeric_funcs.go`, `array_funcs.go`, `object_funcs.go`, `hof_funcs.go`, `boolean_funcs.go`, `datetime_funcs.go`, `datetime_format.go`, `datetime_parse.go`. All registered via `functions.RegisterAll`.
+
+### Fast-Path Byte Evaluation (func_fast.go)
+
+Dispatch-map of `funcFastHandlers` maps each `FuncFastKind` to a standalone handler function (e.g., `evalFuncContains`, `evalFuncString`). Each handler operates directly on `gjson.Result` for zero-copy evaluation. `FuncFastRound` is intentionally absent — it requires banker's rounding handled by the full evaluator.
+
+### Key Types
+
+- **Expression** (`gnata.go`) — Compiled, goroutine-safe JSONata expression with fast-path metadata
+- **StreamEvaluator** (`stream.go`) — Copy-on-write expression slice + `BoundedCache` for schema plans
+- **BoundedCache** (`bounded_cache.go`) — Lock-free FIFO ring-buffer cache (atomic pointer reads)
+- **OrderedMap** (`internal/evaluator/ordered_map.go`) — Insertion-ordered map preserving JSON field order
+- **Environment** (`internal/evaluator/env.go`) — Lexical scope chain for variable bindings
+
+## Dependencies
+
+Only one direct dependency (pure Go, no CGo):
+- `tidwall/gjson` — Zero-copy JSON field extraction for fast-path byte-level evaluation
+
+Regex uses Go's standard `regexp` package (no external regex library).
+
+## Testing
+
+Tests use separate `_test` packages (`gnata_test`, `lexer_test`, `parser_test`). The primary test suite (`suite_test.go`) loads 1,200+ JSON test cases from `testdata/groups/` (100+ subdirectories) — each `.json` file is a case with `expr`, `dataset`, `bindings`, and `result` fields. Datasets live in `testdata/datasets/`. Additional unit tests in `evaluator_test.go` cover regression tests using table-driven test (TDT) style.
+
+## Custom Functions
+
+Register custom functions via `StreamEvaluator` options or standalone `CustomEnv`:
+```go
+customFuncs := map[string]gnata.CustomFunc{
+    "md5": func(args []any, focus any) (any, error) { ... },
+}
+se := gnata.NewStreamEvaluator(nil, gnata.WithCustomFunctions(customFuncs))
+```
+
+## WASM
+
+`wasm/main.go` exports `gnataEval`, `gnataCompile`, `gnataEvalHandle` for browser use. Build with `GOOS=js GOARCH=wasm go build -ldflags="-s -w" -trimpath -o gnata.wasm ./wasm/`.

CODE_OF_CONDUCT.md

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+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation in our community a harassment-free experience for everyone, regardless of age, body size, visible or invisible disability, ethnicity, sex characteristics, gender identity and expression, level of experience, education, socio-economic status, nationality, personal appearance, race, caste, color, religion, or sexual identity and orientation.
+
+We pledge to act and interact in ways that contribute to an open, welcoming, diverse, inclusive, and healthy community.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment for our community include:
+
+* Demonstrating empathy and kindness toward other people
+* Being respectful of differing opinions, viewpoints, and experiences
+* Giving and gracefully accepting constructive feedback
+* Accepting responsibility and apologizing to those affected by our mistakes, and learning from the experience
+* Focusing on what is best not just for us as individuals, but for the overall community
+
+Examples of unacceptable behavior include:
+
+* The use of sexualized language or imagery, and sexual attention or advances of any kind
+* Trolling, insulting or derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or email address, without their explicit permission
+* Other conduct which could reasonably be considered inappropriate in a professional setting
+
+## Enforcement Responsibilities
+
+Community leaders are responsible for clarifying and enforcing our standards of acceptable behavior and will take appropriate and fair corrective action in response to any behavior that they deem inappropriate, threatening, offensive, or harmful.
+
+Community leaders have the right and responsibility to remove, edit, or reject comments, commits, code, wiki edits, issues, and other contributions that are not aligned to this Code of Conduct, and will communicate reasons for moderation decisions when appropriate.
+
+## Scope
+
+This Code of Conduct applies within all community spaces, and also applies when an individual is officially representing the community in public spaces. Examples of representing our community include using an official e-mail address, posting via an official social media account, or acting as an appointed representative at an online or offline event.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be reported to the community leaders responsible for enforcement at **security@reco.ai**. All complaints will be reviewed and investigated promptly and fairly.
+
+All community leaders are obligated to respect the privacy and security of the reporter of any incident.
+
+## Enforcement Guidelines
+
+Community leaders will follow these Community Impact Guidelines in determining the consequences for any action they deem in violation of this Code of Conduct:
+
+### 1. Correction
+
+**Community Impact**: Use of inappropriate language or other behavior deemed unprofessional or unwelcome in the community.
+
+**Consequence**: A private, written warning from community leaders, providing clarity around the nature of the violation and an explanation of why the behavior was inappropriate. A public apology may be requested.
+
+### 2. Warning
+
+**Community Impact**: A violation through a single incident or series of actions.
+
+**Consequence**: A warning with consequences for continued behavior. No interaction with the people involved, including unsolicited interaction with those enforcing the Code of Conduct, for a specified period of time. This includes avoiding interactions in community spaces as well as external channels like social media. Violating these terms may lead to a temporary or permanent ban.
+
+### 3. Temporary Ban
+
+**Community Impact**: A serious violation of community standards, including sustained inappropriate behavior.
+
+**Consequence**: A temporary ban from any sort of interaction or public communication with the community for a specified period of time. No public or private interaction with the people involved, including unsolicited interaction with those enforcing the Code of Conduct, is allowed during this period. Violating these terms may lead to a permanent ban.
+
+### 4. Permanent Ban
+
+**Community Impact**: Demonstrating a pattern of violation of community standards, including sustained inappropriate behavior, harassment of an individual, or aggression toward or disparagement of classes of individuals.
+
+**Consequence**: A permanent ban from any sort of public interaction within the community.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 2.1, available at [https://www.contributor-covenant.org/version/2/1/code_of_conduct.html][v2.1].
+
+Community Impact Guidelines were inspired by [Mozilla's code of conduct enforcement ladder][Mozilla CoC].
+
+For answers to common questions about this code of conduct, see the FAQ at [https://www.contributor-covenant.org/faq][FAQ]. Translations are available at [https://www.contributor-covenant.org/translations][translations].
+
+[homepage]: https://www.contributor-covenant.org
+[v2.1]: https://www.contributor-covenant.org/version/2/1/code_of_conduct.html
+[Mozilla CoC]: https://github.com/mozilla/diversity
+[FAQ]: https://www.contributor-covenant.org/faq
+[translations]: https://www.contributor-covenant.org/translations