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19
Cargo.toml
View File

@ -4,16 +4,11 @@ members = [
"crates/decodal-cli",
"crates/decodal-wasm",
]
resolver = "2"
resolver = "3"
[workspace.package]
version = "0.1.0"
edition = "2024"
rust-version = "1.85"
license = "MIT OR Apache-2.0"
repository = "https://gitea.hareworks.net/Hare/Decodal"
readme = "README.md"
[workspace.dependencies]
serde_json = "1"
wasm-bindgen = "0.2"
[profile.release]
opt-level = "z"
lto = true
codegen-units = 1
strip = true
panic = "abort"

173
LICENSE-APACHE
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@ -1,173 +0,0 @@
Apache License
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http://www.apache.org/licenses/
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7. Disclaimer of Warranty. Unless required by applicable law or
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8. Limitation of Liability. In no event and under no legal theory,
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unless required by applicable law (such as deliberate and grossly
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END OF TERMS AND CONDITIONS

21
LICENSE-MIT
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@ -1,21 +0,0 @@
MIT License
Copyright (c) 2026 Decodal contributors
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

56
README.md
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@ -1,56 +0,0 @@
# Decodal
Decodal is a small deterministic DSL for describing, composing, validating, and materializing structured data.
It is designed around a lightweight Rust core:
- host-supplied imports through `SourceLoader`
- no filesystem access in `decodal-core`
- concrete and abstract values with constraints and defaults
- deterministic expression evaluation
- optional regex support behind a Cargo feature
- browser playground support through WebAssembly
## Install the CLI
```sh
cargo install decodal
```
Run a Decodal file:
```sh
decodal examples/advanced/main.dcdl
```
Enable optional regex support when needed:
```sh
cargo install decodal --features regex
```
## Library crate
Embedded hosts should depend on `decodal-core` and provide imports with a `SourceLoader`.
```toml
[dependencies]
decodal-core = "0.1"
```
## Web playground
The static documentation site and browser playground live under:
```text
site/decodal-site/
```
## License
Licensed under either of:
- Apache License, Version 2.0
- MIT license
at your option.

13
crates/decodal-cli/Cargo.toml
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@ -1,18 +1,11 @@
[package]
name = "decodal"
version.workspace = true
edition.workspace = true
rust-version.workspace = true
license.workspace = true
repository.workspace = true
readme.workspace = true
description = "Command-line interface for the Decodal data description language."
keywords = ["decodal", "dsl", "config", "cli"]
categories = ["command-line-utilities", "config"]
version = "0.1.0"
edition = "2024"
[features]
default = []
regex = ["decodal-core/regex"]
[dependencies]
decodal-core = { version = "0.1.0", path = "../decodal-core" }
decodal-core = { path = "../decodal-core" }

11
crates/decodal-core/Cargo.toml
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@ -1,14 +1,7 @@
[package]
name = "decodal-core"
version.workspace = true
edition.workspace = true
rust-version.workspace = true
license.workspace = true
repository.workspace = true
readme.workspace = true
description = "Core parser, evaluator, and embedding API for the Decodal data description language."
keywords = ["decodal", "dsl", "config", "schema"]
categories = ["config", "parser-implementations"]
version = "0.1.0"
edition = "2024"
[features]
default = ["std"]

17
crates/decodal-wasm/Cargo.toml
View File

@ -1,22 +1,15 @@
[package]
name = "decodal-wasm"
version.workspace = true
edition.workspace = true
rust-version.workspace = true
license.workspace = true
repository.workspace = true
readme.workspace = true
description = "WebAssembly wrapper for evaluating Decodal in browser playgrounds."
keywords = ["decodal", "wasm", "dsl", "config"]
categories = ["wasm", "config"]
version = "0.1.0"
edition = "2024"
[lib]
crate-type = ["cdylib", "rlib"]
[dependencies]
decodal-core = { version = "0.1.0", path = "../decodal-core" }
serde_json.workspace = true
wasm-bindgen.workspace = true
decodal-core = { path = "../decodal-core" }
serde_json = "1"
wasm-bindgen = "0.2"
[package.metadata.wasm-pack.profile.release]
wasm-opt = false

26
doc/manual/souce/development.md
View File

@ -20,29 +20,6 @@ cargo test -p decodal-core --features regex
cargo run -q -p decodal --features regex -- examples/regex/main.dcdl
```
## crates.io release
Crates are published as versioned workspace packages under the dual license `MIT OR Apache-2.0`.
The dependency order matters because `decodal` and `decodal-wasm` depend on `decodal-core` from crates.io.
```sh
cargo publish -p decodal-core
# wait until crates.io index has decodal-core 0.1.0
cargo publish -p decodal
cargo publish -p decodal-wasm
```
Before publishing, run:
```sh
cargo fmt --check
cargo test
cargo check -p decodal-core --no-default-features
cargo publish -p decodal-core --dry-run
```
`cargo publish --dry-run` for `decodal` and `decodal-wasm` will fail until the matching `decodal-core` version is already visible in the crates.io index.
## Web site and playground
The Astro documentation site and browser playground are kept in:
@ -95,8 +72,7 @@ cd site/decodal-site
npm run deploy
```
The deploy script runs `npm run build` and then uploads `dist/` to the Pages project named `decodal-site` on branch `master`.
Cloudflare Pages treats this as production when the project production branch is `master`.
The deploy script runs `npm run build` and then uploads `dist/` to the Pages project named `decodal-site`.
Use `CLOUDFLARE_PROJECT_NAME` when deploying to a differently named Pages project.
```sh

2
site/decodal-site/package.json
View File

@ -8,7 +8,7 @@
"build": "astro build",
"preview": "astro preview --host 0.0.0.0",
"build:wasm": "wasm-pack build ../../crates/decodal-wasm --target web --out-dir ../../site/decodal-site/src/wasm --release",
"deploy": "npm run build && wrangler pages deploy dist --project-name ${CLOUDFLARE_PROJECT_NAME:-decodal-site} --branch ${CLOUDFLARE_BRANCH:-master}",
"deploy": "npm run build && wrangler pages deploy dist --project-name ${CLOUDFLARE_PROJECT_NAME:-decodal-site}",
"deploy:wasm": "npm run build:wasm && npm run deploy"
},
"dependencies": {

5
site/decodal-site/src/pages/playground.astro
View File

@ -9,11 +9,6 @@ import ManualLayout from '../layouts/ManualLayout.astro';
<p>Virtual files are evaluated in the browser through WebAssembly. Use import paths such as <code>./schemas/service.dcdl</code>.</p>
</div>
<div class="playground-actions">
<label class="example-picker">
<span>Example</span>
<select id="example-select" aria-label="Playground example"></select>
</label>
<button id="load-example" type="button">Load</button>
<p id="status" class="status">Loading WASM...</p>
<button id="run" disabled>Run</button>
</div>

174
site/decodal-site/src/scripts/playground-examples.js
View File

@ -1,174 +0,0 @@
export const playgroundExamples = [
{
id: 'service-deployment',
title: 'Service deployment',
activePath: 'main.dcdl',
files: {
'main.dcdl': `let
schema = import "./schemas/service.dcdl";
prod = import "./env/prod.dcdl";
shared = import "./shared/tags.dcdl";
in
schema.Service & prod.ServicePatch & {
name = "api";
image = "registry.example.com/api:2026-06-24";
port = 9000 + 443;
public = prod.is_public && 9000 + 443 > 9000;
tags = shared.common ++ ["api", "edge"];
}
`,
'schemas/service.dcdl': `Service = {
name = String;
image = String;
port = Int & > 443 default 8443;
replicas = Int & > 0 default 2;
public = Bool default false;
feature.metrics = Bool default true;
feature.tracing = Bool default false;
};
`,
'env/prod.dcdl': `is_public = true;
ServicePatch = {
replicas = 3;
feature.tracing = true;
};
`,
'shared/tags.dcdl': `common = ["decodal", "prod"];
`,
},
},
{
id: 'access-policy',
title: 'Access policy',
activePath: 'main.dcdl',
files: {
'main.dcdl': `let
policy = import "./policy/base.dcdl";
teams = import "./policy/teams.dcdl";
env = "prod";
in
{
service = "payments";
readers = policy.defaultReaders ++ teams.observability;
writers = policy.defaultWriters ++ teams.payments;
admins = match env {
"prod": policy.breakglassAdmins;
_: teams.platform;
};
audit.required = env == "prod";
audit.retention_days = match env {
"prod": 365;
_: 30;
};
}
`,
'policy/base.dcdl': `defaultReaders = ["group:engineering", "group:support"];
defaultWriters = ["group:platform"];
breakglassAdmins = ["user:oncall-primary", "user:oncall-secondary"];
`,
'policy/teams.dcdl': `platform = ["group:platform-admins"];
payments = ["group:payments-api", "group:payments-sre"];
observability = ["group:observability"];
`,
},
},
{
id: 'edge-worker',
title: 'Edge worker config',
activePath: 'main.dcdl',
files: {
'main.dcdl': `let
schema = import "./schemas/worker.dcdl";
routes = import "./routes.dcdl";
production = true;
in
schema.Worker & {
name = "decodal-docs";
compatibility_date = "2026-06-15";
workers_dev = !production;
route.host = routes.primary_host;
route.paths = routes.docs_paths ++ routes.playground_paths;
cache.ttl_seconds = 60 * 60;
cache.bypass = !production;
}
`,
'schemas/worker.dcdl': `Worker = {
name = String;
compatibility_date = String;
workers_dev = Bool default false;
route.host = String;
cache.ttl_seconds = Int & >= 0 default 300;
cache.bypass = Bool default false;
};
`,
'routes.dcdl': `primary_host = "decodal.example.com";
docs_paths = ["/docs/*", "/assets/*"];
playground_paths = ["/playground/*"];
`,
},
},
{
id: 'data-pipeline',
title: 'Data pipeline',
activePath: 'main.dcdl',
files: {
'main.dcdl': `let
schema = import "./schemas/pipeline.dcdl";
presets = import "./presets/batch.dcdl";
env = "staging";
in
schema.Pipeline & presets.Batch & {
name = "events-rollup";
source.topic = "events.raw";
sink.table = "analytics.events_daily";
workers = match env {
"prod": 8;
"staging": 3;
_: 1;
};
alerts.enabled = env != "dev";
transforms = presets.standardTransforms ++ ["dedupe", "aggregate_daily"];
}
`,
'schemas/pipeline.dcdl': `Pipeline = {
name = String;
source.topic = String;
sink.table = String;
workers = Int & > 0 default 1;
batch.size = Int & >= 100 default 1000;
batch.timeout_seconds = Int & > 0 default 60;
alerts.enabled = Bool default false;
};
`,
'presets/batch.dcdl': `standardTransforms = ["parse_json", "validate_schema", "enrich_metadata"];
Batch = {
batch.size = 5000;
batch.timeout_seconds = 30 + 30;
};
`,
},
},
{
id: 'diagnostics',
title: 'Diagnostics: invalid port',
activePath: 'main.dcdl',
files: {
'main.dcdl': `let
schema = import "./schemas/service.dcdl";
in
schema.Service & {
name = "broken-api";
port = 442;
}
`,
'schemas/service.dcdl': `Service = {
name = String;
port = Int & > 443 default 8443;
replicas = Int & > 0 default 2;
};
`,
},
},
];

56
site/decodal-site/src/scripts/playground.js
View File

@ -1,9 +1,26 @@
import init, { evaluateProject } from '../wasm/decodal_wasm.js';
import { highlightDecodal } from '../lib/highlight.js';
import { playgroundExamples } from './playground-examples.js';
const STORAGE_KEY = 'decodal-playground-project-v1';
const starterProject = playgroundExamples[0];
const starterFiles = {
'main.dcdl': `let
schema = import "./schemas/service.dcdl";
in
schema.Service & {
name = "api";
port = 9000 + 443;
tags = ["web"] ++ ["prod"];
feature.enable = 9000 + 443 > 9000 && true;
}
`,
'schemas/service.dcdl': `Service = {
name = String;
port = Int & > 443 default 8443;
feature.enable = Bool default true;
};
`,
};
const source = document.getElementById('source');
const sourceHighlight = document.getElementById('source-highlight');
@ -14,19 +31,9 @@ const fileTree = document.getElementById('file-tree');
const activeFile = document.getElementById('active-file');
const newFile = document.getElementById('new-file');
const deleteFile = document.getElementById('delete-file');
const exampleSelect = document.getElementById('example-select');
const loadExample = document.getElementById('load-example');
const project = loadProject();
for (const example of playgroundExamples) {
const option = document.createElement('option');
option.value = example.id;
option.textContent = example.title;
exampleSelect.append(option);
}
exampleSelect.value = starterProject.id;
setActiveFile(project.activePath);
renderFileTree();
updateHighlight();
@ -42,11 +49,7 @@ function loadProject() {
} catch (_error) {
// Fall back to the starter project.
}
return { files: cloneFiles(starterProject.files), activePath: starterProject.activePath };
}
function cloneFiles(files) {
return Object.fromEntries(Object.entries(files).map(([path, source]) => [path, source]));
return { files: { ...starterFiles }, activePath: 'main.dcdl' };
}
function normalizeFiles(files) {
@ -62,17 +65,6 @@ function saveProject() {
localStorage.setItem(STORAGE_KEY, JSON.stringify(project));
}
function loadExampleProject(exampleId) {
const example = playgroundExamples.find((item) => item.id === exampleId) ?? starterProject;
project.files = cloneFiles(example.files);
project.activePath = example.activePath;
exampleSelect.value = example.id;
setActiveFile(project.activePath);
output.textContent = '';
output.classList.remove('error');
execute();
}
function normalizePath(path) {
const parts = [];
for (const part of String(path).replaceAll('\\', '/').split('/')) {
@ -173,12 +165,6 @@ try {
}
run.addEventListener('click', execute);
loadExample.addEventListener('click', () => {
const example = playgroundExamples.find((item) => item.id === exampleSelect.value);
if (!example) return;
if (!confirm(`Load example "${example.title}"? This replaces the current virtual files.`)) return;
loadExampleProject(example.id);
});
newFile.addEventListener('click', () => {
const path = normalizePath(prompt('New virtual file path', 'schemas/types.dcdl') ?? '');
if (!path) return;
@ -186,7 +172,7 @@ newFile.addEventListener('click', () => {
setActiveFile(path);
return;
}
project.files[path] = 'value = "new";\n';
project.files[path] = path.endsWith('.dcdl') ? '' : '// Decodal source\n';
setActiveFile(path);
});
deleteFile.addEventListener('click', () => {

25
site/decodal-site/src/style.css
View File

@ -281,30 +281,7 @@ main.playground {
.playground-actions {
align-items: center;
display: flex;
flex-wrap: wrap;
gap: 8px;
justify-content: flex-end;
}
.example-picker {
align-items: center;
color: var(--muted);
display: flex;
font-size: 12px;
font-weight: 700;
gap: 6px;
text-transform: uppercase;
}
.example-picker select {
background: var(--surface);
border: 1px solid var(--border);
border-radius: 8px;
color: var(--text);
font: inherit;
min-width: 180px;
padding: 7px 10px;
text-transform: none;
gap: 12px;
}
button {