feat: add expression playground tooling by moshloop · Pull Request #175 · flanksource/gomplate

moshloop · 2026-08-15T17:33:29Z

What

Generate grammar-driven Monarch definitions with conformance validation.
Add an embeddable evaluation and metadata API for CEL, Go templates, JSONPath, and JavaScript.
Add a Monaco-powered browser playground with generated definitions and CI coverage.
Preserve CEL native values and cap regex programs at 10,000 instructions.

Why

Keep editor tooling aligned with gomplate evaluator grammars and registries.

Generate Monaco tokenizers and configurations from CEL, Go template, and JSONPath vocabularies. Keep editor highlighting aligned with evaluator grammars and registered functions, with deterministic output and lexer-backed conformance validation.

Expose reusable evaluation and metadata endpoints for hosts embedding gomplate's language playground. Support CEL, Go templates, JSONPath, and JavaScript with source-positioned errors, typed results, host-provided functions, examples, and bounded responses.

Adds generated Monaco language support and an interactive playground for gomplate expressions and templates. Keeps editor catalogues aligned with evaluator registries while providing completion, hover, theming, object-graph exploration, and live evaluation. Includes generated specs, conformance coverage, package documentation, and playground tests.

Provide a browser playground that evaluates against the real gomplate engine and stays aligned with its language registries. Add generated Monaco definitions with drift detection, plus CI coverage for web typechecking, tests, and builds.

Add concurrency-safe native type registration so CEL preserves registered Go values and JSON field mappings. Upgrade cel-go to v0.31, support optimized execution decorators, and enforce a 10,000-instruction regex limit. Rework benchmark CI to interleave base/head samples and report metric-level CSV regressions with tests. Document the new CEL behavior and upcoming collection helpers. Claude-Session-Id: 019fef64-038b-7471-9962-6019a7d08109

coderabbitai · 2026-08-15T17:33:41Z

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📥 Commits

Reviewing files that changed from the base of the PR and between 31a8cb1 and dc96297.

⛔ Files ignored due to path filters (6)

go.sum is excluded by !**/*.sum
web/packages/lang/src/generated/conformance.json is excluded by !**/generated/**
web/packages/lang/src/generated/index.ts is excluded by !**/generated/**
web/packages/lang/src/generated/languages.json is excluded by !**/generated/**
web/packages/lang/src/generated/spec.json is excluded by !**/generated/**
web/pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (114)

.github/scripts/benchstat-summary.py
.github/scripts/benchstat-summary_test.py
.github/workflows/benchmark.yml
.github/workflows/web.yml
.gitignore
CEL.md
Makefile
README.md
cel.go
cel_cast_test.go
cel_expression.go
cel_native.go
cel_native_test.go
cel_result.go
cel_result_test.go
cel_tracker_test.go
cel_v031_bench_test.go
cmd/genmonarch/main.go
cmd/playground/main.go
funcs/cast.go
funcs/cel_exports.go
genmonarch/build.go
genmonarch/conformance.go
genmonarch/conformance_validate.go
genmonarch/grammar/CEL.g4
genmonarch/grammar/antlr_parse.go
genmonarch/grammar/antlr_regex.go
genmonarch/grammar/antlr_test.go
genmonarch/grammar/cel.go
genmonarch/grammar/cel_test.go
genmonarch/grammar/gotemplate.go
genmonarch/grammar/gotemplate_test.go
genmonarch/grammar/suite_test.go
genmonarch/lang_cel.go
genmonarch/lang_embedded.go
genmonarch/lang_gotemplate.go
genmonarch/lang_jsonpath.go
genmonarch/monarch.go
genmonarch/render.go
genmonarch/spec.go
genmonarch/suite_test.go
genmonarch/vocab_cel.go
genmonarch/vocab_cel_test.go
genmonarch/vocab_gotemplate.go
genmonarch/vocab_gotemplate_test.go
go.mod
hack/hostplayground/main.go
nilsafe/nilsafe.go
nilsafe/nilsafe_test.go
nilsafe/zeroval.go
playground/README.md
playground/eval.go
playground/eval_test.go
playground/server.go
run_expression_bench_test.go
serialize.go
serialize_bench_test.go
specs/REQUIREMENTS-coalesce.md
specs/REQUIREMENTS-first-last.md
template.go
template_test.go
web/.gitignore
web/apps/playground/index.html
web/apps/playground/package.json
web/apps/playground/plugins/eval-server.ts
web/apps/playground/src/App.tsx
web/apps/playground/src/RunControls.tsx
web/apps/playground/src/VerticalSplit.tsx
web/apps/playground/src/api.ts
web/apps/playground/src/examples.ts
web/apps/playground/src/functionCatalogue.test.ts
web/apps/playground/src/functionCatalogue.ts
web/apps/playground/src/hashRouter.ts
web/apps/playground/src/languages.ts
web/apps/playground/src/main.tsx
web/apps/playground/src/monaco-setup.ts
web/apps/playground/src/panels/GraphPanel.tsx
web/apps/playground/src/panels/ResultPanel.tsx
web/apps/playground/src/panels/SpecPanel.tsx
web/apps/playground/src/panels/TokensPanel.tsx
web/apps/playground/src/panels/graphNodes.ts
web/apps/playground/src/runAction.ts
web/apps/playground/src/styles.css
web/apps/playground/src/useEditorTheme.ts
web/apps/playground/src/useEvaluator.ts
web/apps/playground/src/useParsedInput.ts
web/apps/playground/src/useUrlState.ts
web/apps/playground/test/examples.test.ts
web/apps/playground/test/graphNodes.test.ts
web/apps/playground/tsconfig.json
web/apps/playground/vite.config.ts
web/package.json
web/packages/lang/README.md
web/packages/lang/package.json
web/packages/lang/src/attributes.ts
web/packages/lang/src/completion.ts
web/packages/lang/src/environment.ts
web/packages/lang/src/hover.ts
web/packages/lang/src/index.ts
web/packages/lang/src/merge.ts
web/packages/lang/src/prefix.ts
web/packages/lang/src/spec.ts
web/packages/lang/src/theme.ts
web/packages/lang/src/types.ts
web/packages/lang/test/completion.test.ts
web/packages/lang/test/conformance.test.ts
web/packages/lang/test/hostSpec.test.ts
web/packages/lang/test/registration.test.ts
web/packages/lang/test/setup.ts
web/packages/lang/test/tokenize.test.ts
web/packages/lang/tsconfig.build.json
web/packages/lang/tsconfig.json
web/packages/lang/vite.config.ts
web/pnpm-workspace.yaml

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github-actions · 2026-08-15T17:33:47Z

Benchstat

Base: 31a8cb108062431a578f5bcc41d30d5946f1abd2
Head: dc9629757e60a1746b24a5d97d72243e3ee79318

7 minor regression(s) (all within 5% threshold)

Benchmark	Metric	Base	Head	Change	p-value
`RunExpressionContextCompile/cache=miss/environment=large-4`	B/op	2.01e+05 B/op	2.1e+05 B/op	+4.66%	0.000
`RunExpressionContextCompile/cache=miss/environment=small-4`	B/op	1.99e+05 B/op	2.08e+05 B/op	+4.65%	0.000
`RunExpressionContext/cache=hit/environment=small-4`	sec/op	1.81 us/op	1.89 us/op	+4.25%	0.001
`RunExpressionContext/cache=hit/environment=large-4`	sec/op	10.8 us/op	10.9 us/op	+0.86%	0.035
`RunExpressionContextCompile/cache=miss/environment=small-4`	allocs/op	2.25e+03 allocs/op	2.26e+03 allocs/op	+0.22%	0.000
`RunExpressionContextCompile/cache=miss/environment=large-4`	allocs/op	2.34e+03 allocs/op	2.34e+03 allocs/op	+0.21%	0.000
`Serialize/items=10000/native_values=true-4`	allocs/op	2.65e+05 allocs/op	2.65e+05 allocs/op	+0.07%	0.008

11 improvement(s)

Benchmark	Metric	Base	Head	Change
`CELEnvExtend/variables=1/functions=0-4`	sec/op	96.9 us/op	5.08 us/op	-94.76%
`CELEnvExtend/variables=10/functions=0-4`	sec/op	99.3 us/op	6.88 us/op	-93.07%
`CELEnvExtend/variables=1/functions=0-4`	B/op	3.77e+04 B/op	3.43e+03 B/op	-90.89%
`CELEnvExtend/variables=10/functions=0-4`	B/op	3.94e+04 B/op	5.15e+03 B/op	-86.93%
`CELEnvExtend/variables=100/functions=0-4`	sec/op	117 us/op	23.2 us/op	-80.20%
`CELEnvExtend/variables=100/functions=0-4`	B/op	5.73e+04 B/op	2.3e+04 B/op	-59.78%
`CELEnvExtend/variables=1/functions=0-4`	allocs/op	132 allocs/op	60 allocs/op	-54.55%
`CELEnvExtend/variables=10/functions=0-4`	allocs/op	151 allocs/op	79 allocs/op	-47.68%
`CELEnvExtend/variables=100/functions=0-4`	allocs/op	253 allocs/op	181 allocs/op	-28.46%
`RunExpressionContextCompile/cache=miss/environment=small-4`	sec/op	349 us/op	329 us/op	-5.92%
`RunExpressionContextCompile/cache=miss/environment=large-4`	sec/op	358 us/op	341 us/op	-4.97%

Full benchstat output

goos: linux
goarch: amd64
pkg: github.com/flanksource/gomplate/v3
cpu: AMD EPYC 7763 64-Core Processor                
                                                                      │ bench-base.txt │           bench-head.txt            │
                                                                      │     sec/op     │   sec/op     vs base                │
RunExpressionContext/cache=hit/environment=small-4                         1.814µ ± 3%   1.891µ ± 1%   +4.25% (p=0.001 n=10)
RunExpressionContext/cache=hit/environment=large-4                         10.81µ ± 1%   10.90µ ± 1%   +0.86% (p=0.035 n=10)
RunExpressionContextCompile/cache=miss/environment=small-4                 349.4µ ± 0%   328.7µ ± 2%   -5.92% (p=0.000 n=10)
RunExpressionContextCompile/cache=miss/environment=large-4                 358.3µ ± 1%   340.5µ ± 0%   -4.97% (p=0.000 n=10)
CELEnvExtend/variables=1/functions=0-4                                    96.938µ ± 1%   5.076µ ± 1%  -94.76% (p=0.000 n=10)
CELEnvExtend/variables=10/functions=0-4                                   99.258µ ± 2%   6.875µ ± 1%  -93.07% (p=0.000 n=10)
CELEnvExtend/variables=100/functions=0-4                                  117.43µ ± 1%   23.25µ ± 1%  -80.20% (p=0.000 n=10)
Serialize/items=10/native_values=true-4                                    36.20µ ± 1%   36.30µ ± 1%        ~ (p=0.853 n=10)
Serialize/items=100/native_values=true-4                                   346.0µ ± 1%   347.0µ ± 1%        ~ (p=0.393 n=10)
Serialize/items=1000/native_values=true-4                                  3.471m ± 1%   3.464m ± 0%        ~ (p=0.247 n=10)
Serialize/items=10000/native_values=true-4                                 40.32m ± 1%   40.45m ± 2%        ~ (p=0.739 n=10)
Serialize_NoNativeTypes/items=100/native_values=false-4                    89.92µ ± 3%   90.43µ ± 1%        ~ (p=0.579 n=10)
Serialize_NoNativeTypes/items=1000/native_values=false-4                   908.8µ ± 1%   908.2µ ± 1%        ~ (p=0.971 n=10)
Serialize_NoNativeTypes/items=10000/native_values=false-4                  9.098m ± 1%   9.118m ± 1%        ~ (p=0.218 n=10)
CELEnvExtendCustomFunction-4                                                             76.42µ ± 1%
CELProgramEvaluation/expression=scalar/optimized=false-4                                 216.2n ± 2%
CELProgramEvaluation/expression=scalar/optimized=true-4                                  216.1n ± 1%
CELProgramEvaluation/expression=list_optional_regex/optimized=false-4                    5.771µ ± 2%
CELProgramEvaluation/expression=list_optional_regex/optimized=true-4                     1.537µ ± 1%
CELProgramEvaluation/expression=comprehension/optimized=false-4                          7.507µ ± 1%
CELProgramEvaluation/expression=comprehension/optimized=true-4                           7.030µ ± 1%
RunExpressionNativeInput/input=map-4                                                     2.722µ ± 1%
RunExpressionNativeInput/input=native_struct-4                                           2.919µ ± 0%
geomean                                                                    249.5µ        31.67µ       -40.58%

                                                                      │ bench-base.txt │             bench-head.txt             │
                                                                      │      B/op      │     B/op      vs base                  │
RunExpressionContext/cache=hit/environment=small-4                          664.0 ± 0%     664.0 ± 0%        ~ (p=1.000 n=10) ¹
RunExpressionContext/cache=hit/environment=large-4                        2.445Ki ± 0%   2.445Ki ± 0%        ~ (p=1.000 n=10) ¹
RunExpressionContextCompile/cache=miss/environment=small-4                194.4Ki ± 0%   203.4Ki ± 0%   +4.65% (p=0.000 n=10)
RunExpressionContextCompile/cache=miss/environment=large-4                196.3Ki ± 0%   205.4Ki ± 0%   +4.66% (p=0.000 n=10)
CELEnvExtend/variables=1/functions=0-4                                   36.803Ki ± 0%   3.352Ki ± 0%  -90.89% (p=0.000 n=10)
CELEnvExtend/variables=10/functions=0-4                                  38.482Ki ± 0%   5.031Ki ± 0%  -86.93% (p=0.000 n=10)
CELEnvExtend/variables=100/functions=0-4                                  55.96Ki ± 0%   22.50Ki ± 0%  -59.78% (p=0.000 n=10)
Serialize/items=10/native_values=true-4                                   11.06Ki ± 0%   11.06Ki ± 0%        ~ (p=1.000 n=10) ¹
Serialize/items=100/native_values=true-4                                  95.51Ki ± 0%   95.51Ki ± 0%        ~ (p=0.534 n=10)
Serialize/items=1000/native_values=true-4                                 952.6Ki ± 0%   952.6Ki ± 0%        ~ (p=0.589 n=10)
Serialize/items=10000/native_values=true-4                                10.06Mi ± 0%   10.09Mi ± 0%        ~ (p=0.078 n=10)
Serialize_NoNativeTypes/items=100/native_values=false-4                   36.33Ki ± 0%   36.33Ki ± 0%        ~ (p=1.000 n=10)
Serialize_NoNativeTypes/items=1000/native_values=false-4                  365.6Ki ± 0%   365.6Ki ± 0%        ~ (p=1.000 n=10)
Serialize_NoNativeTypes/items=10000/native_values=false-4                 3.584Mi ± 0%   3.584Mi ± 0%        ~ (p=0.587 n=10)
CELEnvExtendCustomFunction-4                                                             45.19Ki ± 0%
CELProgramEvaluation/expression=scalar/optimized=false-4                                   64.00 ± 0%
CELProgramEvaluation/expression=scalar/optimized=true-4                                    64.00 ± 0%
CELProgramEvaluation/expression=list_optional_regex/optimized=false-4                    4.463Ki ± 0%
CELProgramEvaluation/expression=list_optional_regex/optimized=true-4                       741.0 ± 0%
CELProgramEvaluation/expression=comprehension/optimized=false-4                          2.822Ki ± 0%
CELProgramEvaluation/expression=comprehension/optimized=true-4                           2.438Ki ± 0%
RunExpressionNativeInput/input=map-4                                                       808.0 ± 0%
RunExpressionNativeInput/input=native_struct-4                                            1000.0 ± 0%
geomean                                                                   90.37Ki        12.95Ki       -31.26%
¹ all samples are equal

                                                                      │ bench-base.txt │            bench-head.txt             │
                                                                      │   allocs/op    │  allocs/op   vs base                  │
RunExpressionContext/cache=hit/environment=small-4                          20.00 ± 0%    20.00 ± 0%        ~ (p=1.000 n=10) ¹
RunExpressionContext/cache=hit/environment=large-4                          101.0 ± 0%    101.0 ± 0%        ~ (p=1.000 n=10) ¹
RunExpressionContextCompile/cache=miss/environment=small-4                 2.253k ± 0%   2.258k ± 0%   +0.22% (p=0.000 n=10)
RunExpressionContextCompile/cache=miss/environment=large-4                 2.336k ± 0%   2.341k ± 0%   +0.21% (p=0.000 n=10)
CELEnvExtend/variables=1/functions=0-4                                     132.00 ± 0%    60.00 ± 0%  -54.55% (p=0.000 n=10)
CELEnvExtend/variables=10/functions=0-4                                    151.00 ± 0%    79.00 ± 0%  -47.68% (p=0.000 n=10)
CELEnvExtend/variables=100/functions=0-4                                    253.0 ± 0%    181.0 ± 0%  -28.46% (p=0.000 n=10)
Serialize/items=10/native_values=true-4                                     268.0 ± 0%    268.0 ± 0%        ~ (p=1.000 n=10) ¹
Serialize/items=100/native_values=true-4                                   2.518k ± 0%   2.518k ± 0%        ~ (p=1.000 n=10) ¹
Serialize/items=1000/native_values=true-4                                  25.80k ± 0%   25.80k ± 0%        ~ (p=1.000 n=10) ¹
Serialize/items=10000/native_values=true-4                                 265.1k ± 0%   265.3k ± 0%   +0.07% (p=0.008 n=10)
Serialize_NoNativeTypes/items=100/native_values=false-4                     911.0 ± 0%    911.0 ± 0%        ~ (p=1.000 n=10) ¹
Serialize_NoNativeTypes/items=1000/native_values=false-4                   9.758k ± 0%   9.758k ± 0%        ~ (p=0.474 n=10)
Serialize_NoNativeTypes/items=10000/native_values=false-4                  100.1k ± 0%   100.1k ± 0%        ~ (p=0.518 n=10)
CELEnvExtendCustomFunction-4                                                              100.0 ± 0%
CELProgramEvaluation/expression=scalar/optimized=false-4                                  3.000 ± 0%
CELProgramEvaluation/expression=scalar/optimized=true-4                                   3.000 ± 0%
CELProgramEvaluation/expression=list_optional_regex/optimized=false-4                     105.0 ± 0%
CELProgramEvaluation/expression=list_optional_regex/optimized=true-4                      23.00 ± 0%
CELProgramEvaluation/expression=comprehension/optimized=false-4                           92.00 ± 0%
CELProgramEvaluation/expression=comprehension/optimized=true-4                            82.00 ± 0%
RunExpressionNativeInput/input=map-4                                                      27.00 ± 0%
RunExpressionNativeInput/input=native_struct-4                                            26.00 ± 0%
geomean                                                                    1.470k         290.0       -11.85%
¹ all samples are equal

socket-security · 2026-08-15T17:35:26Z

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Package	Supply Chain Security	Vulnerability
npm/jsdom@26.1.0
golang/github.com/google/cel-go@v0.27.0 ⏵ v0.31.0	⁺¹	⁺²
npm/@types/react-dom@19.2.4
npm/@flanksource/clicky-ui@0.3.20
npm/vitest@3.2.7
npm/@types/react@19.2.18
npm/@types/node@22.20.1
npm/vite@6.4.3
npm/tailwindcss@4.3.3
npm/react@19.2.8
npm/yaml@2.9.0
npm/@tailwindcss/vite@4.3.3
npm/typescript@5.9.3
npm/monaco-editor@0.48.0
npm/react-dom@19.2.8
npm/@vitejs/plugin-react@4.7.0

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socket-security · 2026-08-15T17:35:28Z

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… one JSON artifact Keep tokenizer and configuration data together in one stable generated artifact while preserving the definitions export. BREAKING CHANGE: Remove per-language *.monarch.json and *.config.json artifacts; consumers must use languages.json or the generated definitions export Claude-Session-Id: 36467ebc-f368-4040-bc75-e28248497b4c

Keep generated Monarch and editor configuration metadata in one catalog so the language package has a single import surface while preserving all existing definitions.

Add tolerant text, integer, float, and date conversions for scraped values while preserving clear conversion errors. Normalize constructed CEL maps, lists, and nulls into usable Go values for downstream consumers.

Prevent missing timestamps and durations from being coerced to zero values, avoiding misleading comparison results. BREAKING CHANGE: temporal comparisons with null now propagate null instead of returning epoch-based booleans.

…ld hooks Expose newly supported conversion functions in language metadata and build the language package before tests and type checks so validation uses current generated output

moshloop added 5 commits August 14, 2026 15:26

github-actions Bot added dependencies build labels Aug 15, 2026

moshloop added 5 commits August 16, 2026 16:59

refactor(lang): consolidate generated language definitions

50c1799

Keep generated Monarch and editor configuration metadata in one catalog so the language package has a single import surface while preserving all existing definitions.

feat(cel): add flexible cast helpers and normalize expression results

f19a13a

Add tolerant text, integer, float, and date conversions for scraped values while preserving clear conversion errors. Normalize constructed CEL maps, lists, and nulls into usable Go values for downstream consumers.

fix(nilsafe): preserve null for missing temporal values

df6f3e5

Prevent missing timestamps and durations from being coerced to zero values, avoiding misleading comparison results. BREAKING CHANGE: temporal comparisons with null now propagate null instead of returning epoch-based booleans.

feat(lang): add generated conversion functions and pre-validation bui…

dc96297

…ld hooks Expose newly supported conversion functions in language metadata and build the language package before tests and type checks so validation uses current generated output

moshloop merged commit a16dac4 into main Aug 18, 2026
10 checks passed

moshloop deleted the playground branch August 18, 2026 10:06

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feat: add expression playground tooling - #175

feat: add expression playground tooling#175
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moshloop commented Aug 15, 2026

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Benchstat

7 minor regression(s) (all within 5% threshold)

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coderabbitai Bot commented Aug 15, 2026 •

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