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https://github.com/Peanuuutz/tomlkt
Multiplatform TOML library with builtin support for kotlinx.serialization
https://github.com/Peanuuutz/tomlkt
kotlin kotlin-library kotlin-multiplatform toml
Last synced: about 1 month ago
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Multiplatform TOML library with builtin support for kotlinx.serialization
- Host: GitHub
- URL: https://github.com/Peanuuutz/tomlkt
- Owner: Peanuuutz
- License: apache-2.0
- Created: 2022-01-05T06:25:19.000Z (almost 3 years ago)
- Default Branch: master
- Last Pushed: 2024-06-16T12:09:46.000Z (6 months ago)
- Last Synced: 2024-08-02T05:10:37.183Z (4 months ago)
- Topics: kotlin, kotlin-library, kotlin-multiplatform, toml
- Language: Kotlin
- Homepage:
- Size: 1.87 MB
- Stars: 112
- Watchers: 1
- Forks: 5
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
- kmp-awesome - tomlkt - Multiplatform TOML encoder and decoder, powered by kotlinx.serialization (Libraries / 🗃 Serializer)
README
# tomlkt
[](https://search.maven.org/artifact/net.peanuuutz.tomlkt/tomlkt)
[](http://www.apache.org/licenses/LICENSE-2.0)
Powerful and easy to use [kotlinx.serialization](https://github.com/Kotlin/kotlinx.serialization) plugin for [TOML 1.0.0 compliance](https://toml.io/en/v1.0.0)
encoding and decoding.
*If you find any problem along usage, please raise an [issue](https://github.com/Peanuuutz/tomlkt/issues).* :wink:
## Setup
Gradle Kotlin (build.gradle.kts)
```kotlin
repositories {
mavenCentral()
}
dependencies {
implementation("net.peanuuutz.tomlkt:tomlkt:0.4.0")
}
```
Gradle Groovy (build.gradle)
```groovy
repositories {
mavenCentral()
}
dependencies {
implementation "net.peanuuutz.tomlkt:tomlkt:0.4.0"
}
```
Maven (.pom)
```xml
net.peanuuutz.tomlkt
tomlkt-jvm
0.4.0
```
*Note: If your project is Kotlin Multiplatform, you can simply add this into commonMain
dependencies.*
## Quick Start
Write some config:
```toml
name = "Peanuuutz"
[account]
username = "Peanuuutz"
password = "123456"
```
Write some code:
```kotlin
@Serializable
data class User(
val name: String,
val account: Account?
)
@Serializable
data class Account(
val username: String,
val password: String
)
fun main() {
// Here we use JVM.
val tomlString = Paths.get("...").readText()
// Either is OK, but to explicitly pass a serializer is faster.
val user = Toml.decodeFromString(User.serializer(), tomlString)
val user = Toml.decodeFromString(tomlString)
// That's it!
// By the way if you need some configuration.
val toml = Toml {
ignoreUnknownKeys = true
}
// Use toml to apply the change.
// Encoding.
val anotherUser = User("Anonymous", null)
// Again, better to explicitly pass a serializer.
val config = Toml.encodeToString(User.serializer(), anotherUser)
Paths.get("...").writeText(config)
// Done.
}
```
## Supported TOML Features
| TOML Data Type | Encoding | Decoding |
|-------------------------|--------------------|--------------------|
| [Comment](#Comment) | :heavy_check_mark: | :heavy_check_mark: |
| Key | :heavy_check_mark: | :heavy_check_mark: |
| [String](#String) | :heavy_check_mark: | :heavy_check_mark: |
| Integer | :heavy_check_mark: | :heavy_check_mark: |
| Float | :heavy_check_mark: | :heavy_check_mark: |
| Boolean | :heavy_check_mark: | :heavy_check_mark: |
| [Date Time](#Date-Time) | :heavy_check_mark: | :heavy_check_mark: |
| Array | :heavy_check_mark: | :heavy_check_mark: |
| Table | :heavy_check_mark: | :heavy_check_mark: |
| Inline Table | :heavy_check_mark: | :heavy_check_mark: |
| Array of Tables | :heavy_check_mark: | :heavy_check_mark: |
### Comment
Implemented as an annotation `@TomlComment` on **properties**:
```kotlin
class IntData(
@TomlComment("""
An integer,
but is decoded into Long originally.
""")
val int: Int
)
IntData(10086)
```
The code above will be encoded into:
```toml
# An integer,
# but is decoded into Long originally.
int = 10086
```
### String
Basic strings are encoded as `""`. For multilines and literals, put an annotation as
below:
```kotlin
class MultilineStringData(
@TomlMultilineString
val multilineString: String
)
MultilineStringData("""
Do, a deer, a female deer.
Re, a drop of golden sun.
""".trimIndent())
class LiteralStringData(
@TomlLiteralString
val literalString: String
)
LiteralStringData("C:\\Users\\\\.m2\\repositories")
```
The code above will be encoded into:
```toml
multilineString = """
Do, a deer, a female deer.
Re, a drop of golden sun."""
literalString = 'C:\Users\\.m2\repositories'
```
You can use both annotations to get multiline literal string.
### Date Time
TOML supports several date time formats, so does tomlkt. tomlkt declares `TomlLocalDateTime`,
`TomlOffsetDateTime`, `TomlLocalDate`, `TomlLocalTime` as expect types with builtin support for
serialization (`@Serializable`).
The mapping of these expect types are as follows:
| tomlkt | java.time | kotlinx.datetime |
|--------------------|----------------|------------------|
| TomlLocalDateTime | LocalDateTime | LocalDateTime |
| TomlOffsetDateTime | OffsetDateTime | Instant |
| TomlLocalDate | LocalDate | LocalDate |
| TomlLocalTime | LocalTime | LocalTime |
[TomlLiteral](https://github.com/Peanuuutz/tomlkt/tree/master/core/src/commonMain/kotlin/net/peanuuutz/tomlkt/TomlElement.kt) is the default intermediate representation of a date time. For conversion,
simply use `TomlLiteral(TomlLocalDateTime)` to create a `TomlLiteral` from a `TomlLocalDateTime`
(true for other types), and `TomlLiteral.toLocalDateTime()` for the other way.
If you would like to provide a custom serializer, use `NativeLocalDateTime` and the like as raw
types.
### TomlElement
The working process of tomlkt:
* Encoding: Model → (TomlElementEncoder) → TomlElement → (TomlElementEmitter) → File.
* Decoding: File → (TomlElementParser) → TomlElement → (TomlElementDecoder) → Model.
As shown, if you already have a TOML file, you can have no model class, but still gain access
to every entry with the help of [TomlElement](https://github.com/Peanuuutz/tomlkt/tree/master/core/src/commonMain/kotlin/net/peanuuutz/tomlkt/TomlElement.kt). Simply parse the file with
`Toml.parseToTomlTable`, then access entries via various `TomlTable` extensions. Also, if you
are a framework author, you would also need the power of dynamic construction. For example, you
can construct a `TomlTable` like this:
```kotlin
val table = buildTomlTable {
literal("title", "TOML Example")
table("database") {
literal("enabled", true)
array("ports", TomlInline.Instance) {
literal(8000)
}
table("temperature") {
val commentForCpu = """
The max temperature for the core.
DO NOT SET OVER 100.0!
""".trimIndent()
literal("cpu", 79.5, TomlComment(commentForCpu))
}
}
array("servers", TomlComment("Available servers.")) {
table {
literal("ip", "10.0.0.1")
literal("role", "main")
}
table {
literal("ip", "10.0.0.2")
}
}
}
```
The code above will be encoded into:
```toml
title = "TOML Example"
[database]
enabled = true
ports = [ 8000 ]
[database.temperature]
# The max temperature for the core.
# DO NOT SET OVER 100.0!
cpu = 79.5
# Available servers.
[[servers]]
ip = "10.0.0.1"
role = "main"
[[servers]]
ip = "10.0.0.2"
```
*Note: All the metadata coming from [annotations](https://github.com/Peanuuutz/tomlkt/tree/master/core/src/commonMain/kotlin/net/peanuuutz/tomlkt/Annotations.kt) is ignored in the parser, meaning that
despite you could parse a file into an element, you cannot emit it back to file fully as is.*
### Others
For other information, view [API docs](https://peanuuutz.github.io/tomlkt/).