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# toml-eslint-parser
A TOML parser that produces output [compatible with ESLint](https://eslint.org/docs/developer-guide/working-with-custom-parsers#all-nodes).
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## Features
- Converts TOML text to [AST](./docs/AST.md).
- Support for [TOML 1.0.0](https://toml.io/en/v1.0.0).
- Experimental support for TOML 1.1.0. (Specifications for November 2023)
## Installation
```bash
npm install --save-dev toml-eslint-parser
```
## Usage
### Configuration
Use `.eslintrc.*` file to configure parser. See also: [https://eslint.org/docs/user-guide/configuring](https://eslint.org/docs/user-guide/configuring).
Example **.eslintrc.js**:
```js
module.exports = {
overrides: [
{
files: ["*.toml"],
parser: "toml-eslint-parser",
},
],
};
```
### Advanced Configuration
The following additional configuration options are available by specifying them in [parserOptions](https://eslint.org/docs/latest/user-guide/configuring/language-options#specifying-parser-options) in your ESLint configuration file.
Example **.eslintrc.js**:
```js
module.exports = {
overrides: [
{
files: ["*.toml"],
parser: "toml-eslint-parser",
// Additional configuration options
parserOptions: {
tomlVersion: "1.0.0",
},
},
],
};
```
#### `parserOptions.tomlVersion`
Select the TOML version by setting `"1.0.0"`, `"1.1.0"`, `"1.0"`, `"1.1"`, `"latest"`, or `"next"`. By default `"1.0.0"` is used.
- `"1.0.0"` ... Parsed using [TOML v1.0.0 specifications](https://toml.io/en/v1.0.0).
- `"1.0"` ... Alias for `"1.0.0"`.
- `"1.1.0"` ... Parsed using the TOML v1.1.0 specification, which is currently [under development](https://github.com/toml-lang/toml/issues/928). TOML 1.1.0 has not been released yet, so `"1.1.0"` is still an experimental feature. Please note that this may be subject to breaking changes in minor version releases of this parser.
- `"1.1"` ... Alias for `"1.1.0"`.
- `"latest"` ... Currently an alias for `"1.0.0"`. When a new version of TOML is released, we plan to change to that version in a minor version release of this parser.
- `"next"` ... Currently an alias for `"1.1.0"`.
## Usage for Custom Rules / Plugins
- [AST.md](./docs/AST.md) is AST specification.
- [keys-order.ts](https://github.com/ota-meshi/eslint-plugin-toml/blob/main/src/rules/keys-order.ts) is an example.
- You can see the AST on the [Online DEMO](https://ota-meshi.github.io/toml-eslint-parser/).
## Usage for Directly
Example:
```ts
import type { AST } from "toml-eslint-parser";
import { parseTOML, getStaticTOMLValue } from "toml-eslint-parser";
const code = `
# This is a TOML document
title = "TOML Example"
[owner]
name = "Tom Preston-Werner"
dob = 1979-05-27T07:32:00-08:00
[database]
enabled = true
ports = [ 8001, 8001, 8002 ]
data = [ ["delta", "phi"], [3.14] ]
temp_targets = { cpu = 79.5, case = 72.0 }
[servers]
[servers.alpha]
ip = "10.0.0.1"
role = "frontend"
[servers.beta]
ip = "10.0.0.2"
role = "backend"
`;
const ast: AST.TOMLProgram = parseTOML(code);
console.log(ast);
// {
// type: 'Program',
// body: [
// {
// type: 'TOMLTopLevelTable',
// body: [
// {
// type: 'TOMLKeyValue',
// key: { /* ... */ },
// value: { /* ... */ },
// /* ... */
// },
// {
// type: 'TOMLTable',
// kind: 'standard',
// key: { /* ... */ },
// body: [ /* ... */ ],
// /* ... */
// },
// /* ... */
// ]
// /* ... */
// }
// ],
// tokens: [ /* ... */ ],
// comments: [
// {
// type: 'Block',
// value: ' This is a TOML document',
// // ...
// }
// ],
// }
const value = getStaticTOMLValue(ast);
console.log(value);
// {
// title: 'TOML Example',
// owner: { name: 'Tom Preston-Werner', dob: 1979-05-27T15:32:00.000Z },
// database: {
// enabled: true,
// ports: [ 8001, 8001, 8002 ],
// data: [ [ /* ... */ ], [ /* ... */ ] ],
// temp_targets: { cpu: 79.5, case: 72 }
// },
// servers: {
// alpha: { ip: '10.0.0.1', role: 'frontend' },
// beta: { ip: '10.0.0.2', role: 'backend' }
// }
// }
```
## Testing
This project uses files from [BurntSushi/toml-test](https://github.com/BurntSushi/toml-test) and [iarna/toml-spec-tests](https://github.com/iarna/toml-spec-tests) repositories for testing.
## Related Packages
- [eslint-plugin-jsonc](https://github.com/ota-meshi/eslint-plugin-jsonc) ... ESLint plugin for JSON, JSON with comments (JSONC) and JSON5.
- [eslint-plugin-yml](https://github.com/ota-meshi/eslint-plugin-yml) ... ESLint plugin for YAML.
- [eslint-plugin-toml](https://github.com/ota-meshi/eslint-plugin-toml) ... ESLint plugin for TOML.
- [eslint-plugin-json-schema-validator](https://github.com/ota-meshi/eslint-plugin-json-schema-validator) ... ESLint plugin that validates data using JSON Schema Validator.
- [jsonc-eslint-parser](https://github.com/ota-meshi/jsonc-eslint-parser) ... JSON, JSONC and JSON5 parser for use with ESLint plugins.
- [yaml-eslint-parser](https://github.com/ota-meshi/yaml-eslint-parser) ... YAML parser for use with ESLint plugins.