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https://github.com/sparsetech/toml-scala
TOML parser with codec derivation for the Scala platform
https://github.com/sparsetech/toml-scala
scala scala-native scalajs shapeless toml
Last synced: about 2 months ago
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TOML parser with codec derivation for the Scala platform
- Host: GitHub
- URL: https://github.com/sparsetech/toml-scala
- Owner: sparsetech
- Archived: true
- Created: 2017-11-06T17:40:52.000Z (about 7 years ago)
- Default Branch: master
- Last Pushed: 2024-10-24T17:24:06.000Z (3 months ago)
- Last Synced: 2024-10-26T01:16:27.231Z (3 months ago)
- Topics: scala, scala-native, scalajs, shapeless, toml
- Language: Scala
- Homepage:
- Size: 75.2 KB
- Stars: 27
- Watchers: 2
- Forks: 7
- Open Issues: 5
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
- awesome-scala-native - toml-scala - [TOML](https://github.com/toml-lang/toml) parser with codec derivation. (File Formats and Parsers)
README
# toml-scala
[](https://travis-ci.org/sparsetech/toml-scala)
[](http://ci.sparse.tech/sparsetech/toml-scala)
[](http://search.maven.org/#search%7Cga%7C1%7Cg%3A%22tech.sparse%22%20AND%20a%3A%22toml-scala_2.12%22)
toml-scala is a feature-complete implementation of [TOML](https://github.com/toml-lang/toml) for the Scala platform. It can parse TOML content into an AST or map it onto `case class` hierarchies. Furthermore, it can generate TOML back from an AST.
## Status
This library is no longer maintained. Please switch to [this fork](https://github.com/indoorvivants/toml-scala) maintained by Indoor Vivants, which adds support for Scala 3.
## Features
- Standard-compliant
- AST parsing
- Codec derivation
- Optional values
- Custom codecs
- Generating TOML from ASTs
- Error handling
- Property-based unit tests
## Compatibility
| Back end | Scala versions | Date support | Tests |
|:-----------|:------------------|:-------------|:--------------|
| JVM | 2.11, 2.12, 2.13 | Yes | Yes |
| JavaScript | 2.11, 2.12, 2.13 | No (1) | Yes |
| LLVM | 2.11 | No (1) | Partially (2) |
* (1) JavaScript and LLVM have insufficient support for the JDK8's `java.time`. Parsing of dates and times is presently only possible under the JVM.
* (2) Presently, Scala Native does not support running ScalaCheck test suites.
### Dependencies
```scala
libraryDependencies += "tech.sparse" %% "toml-scala" % "" // JVM
libraryDependencies += "tech.sparse" %%% "toml-scala" % "" // JavaScript, LLVM
```
## Examples
### AST parsing
```scala
toml.Toml.parse("a = 1") // Right(Tbl(Map(a -> Num(1))))
```
### Codec derivation
The following import is needed:
```scala
import toml.Codecs._
```
#### Tables
```scala
case class Table(b: Int)
case class Root(a: Int, table: Table)
val table =
"""
|a = 1
|[table]
|b = 2
""".stripMargin
Toml.parseAs[Root](table) // Right(Root(1, Table(2)))
```
#### Table lists
```scala
val tableList =
"""
|points = [ { x = 1, y = 2, z = 3 },
| { x = 7, y = 8, z = 9 },
| { x = 2, y = 4, z = 8 } ]
""".stripMargin
case class Point(x: Int, y: Int, z: Int)
case class Root(points: List[Point])
Toml.parseAs[Root](tableList)
// Right(Root(List(
// Point(1, 2, 3),
// Point(7, 8, 9),
// Point(2, 4, 8))))
```
Lists can be mapped onto `case class`es as a shorter alternative. Therefore, the following notation would yield the same result:
```toml
points = [ [ 1, 2, 3 ],
[ 7, 8, 9 ],
[ 2, 4, 8 ] ]
```
#### Optional values
```scala
case class Table(b: Int)
case class Root(a: Int, table: Option[Table])
Toml.parseAs[Root]("a = 1") // Right(Root(1, None))
```
#### Define custom codecs
```scala
case class Currency(name: String)
implicit val currencyCodec: Codec[Currency] = Codec {
case (Value.Str(value), _, _) =>
value match {
case "EUR" => Right(Currency("EUR"))
case "BTC" => Right(Currency("BTC"))
case _ => Left((List(), s"Invalid currency: $value"))
}
case (value, _, _) => Left((List(), s"Currency expected, $value provided"))
}
case class Root(currency: Currency)
Toml.parseAs[Root]("""currency = "BTC"""") // Right(Root(Currency(BTC)))
```
#### Generate TOML
```scala
val root = Root(List(Pair("scalaDeps", Arr(List(
Arr(List(Str("io.monix"), Str("minitest"), Str("2.2.2"))),
Arr(List(Str("org.scalacheck"), Str("scalacheck"), Str("1.14.0"))),
Arr(List(Str("org.scalatest"), Str("scalatest"), Str("3.2.0-SNAP10")))
)))))
Toml.generate(root)
```
Returns:
```toml
scalaDeps = [
["io.monix", "minitest", "2.2.2"],
["org.scalacheck", "scalacheck", "1.14.0"],
["org.scalatest", "scalatest", "3.2.0-SNAP10"]
]
```
#### Language Extensions
toml-scala supports the following language extensions which are disabled by default:
* [New lines and trailing commas in inline tables](https://github.com/toml-lang/toml/issues/516)
To enable them, pass in a set of extensions to the `parse()` or `parseAs()` function as a second argument:
```scala
toml.Toml.parse("""key = {
a = 23,
b = 42,
}""", Set(toml.Extension.MultiLineInlineTables))
```
## Links
* [ScalaDoc](https://www.javadoc.io/doc/tech.sparse/toml-scala_2.12/)
## Licence
toml-scala is licensed under the terms of the Mozilla Public Licence v2.0.
## Credits
The rules and their respective tests were derived from [stoml](https://github.com/jvican/stoml) by Jorge Vicente Cantero.
toml-scala is based on top of [FastParse](https://github.com/lihaoyi/fastparse) for defining the language rules. [ScalaCheck](https://github.com/rickynils/scalacheck) allows us to test synthetic examples of TOML files. The codec derivation was implemented using [Shapeless](https://github.com/milessabin/shapeless).
## Contributors
* Tim Nieradzik