Kotlin API

Installation

Refer to this to configure your Maven; set up your GitHub account and Token in the settings.xml.

Maven

In your project's pom.xml, configure our repository as follows:

<repositories>
    <repository>
        <id>github</id>
        <url>https://maven.pkg.github.com/kcl-lang/*</url>
        <snapshots>
            <enabled>true</enabled>
        </snapshots>
    </repository>
</repositories>

This way you'll be able to import the above dependency to use the SDK.

<dependency>
    <groupId>com.kcl</groupId>
    <artifactId>kcl-lib-kotlin</artifactId>
    <version>0.12.1</version>
</dependency>

Quick Start

import com.kcl.api.API
import com.kcl.api.execProgramArgs

val args = execProgramArgs { kFilenameList += "schema.k" }
val api = API()
val result = api.execProgram(args)

API Reference

execProgram

Execute KCL file with arguments and return the JSON/YAML result.

Example

The content of schema.k is

schema AppConfig:
    replicas: int

app: AppConfig {
    replicas: 2
}

Kotlin Code

import com.kcl.api.API
import com.kcl.api.execProgramArgs

val args = execProgramArgs { kFilenameList += "schema.k" }
val api = API()
val result = api.execProgram(args)

parseFile

Parse KCL single file to Module AST JSON string with import dependencies and parse errors.

Example

The content of schema.k is

schema AppConfig:
    replicas: int

app: AppConfig {
    replicas: 2
}

Kotlin Code

import com.kcl.api.API
import com.kcl.api.parseFileArgs

val args = parseFileArgs { path = "schema.k" }
val api = API()
val result = api.parseFile(args)

loadPackage

loadPackage provides users with the ability to parse KCL program and semantic model information including symbols, types, definitions, etc.

Example

The content of schema.k is

schema AppConfig:
    replicas: int

app: AppConfig {
    replicas: 2
}

Kotlin Code

import com.kcl.api.API
import com.kcl.api.loadPackageArgs
import com.kcl.api.parseProgramArgs

val args = loadPackageArgs { parseArgs = parseProgramArgs { paths += "schema.k" }; resolveAst = true }
val api = API()
val result = api.loadPackage(args)

listVariables

listVariables provides users with the ability to parse KCL program and get all variables by specs.

Example

The content of schema.k is

schema AppConfig:
    replicas: int

app: AppConfig {
    replicas: 2
}

Kotlin Code

import com.kcl.api.API
import com.kcl.api.listVariablesArgs

val args = listVariablesArgs { files += "./src/test_data/schema.k" }
val api = API()
val result = api.listVariables(args)

listOptions

listOptions provides users with the ability to parse KCL program and get all option information.

Example

The content of options.k is

a = option("key1")
b = option("key2", required=True)
c = {
    metadata.key = option("metadata-key")
}

Kotlin Code

import com.kcl.api.API
import com.kcl.api.parseProgramArgs

val args = parseProgramArgs { paths += "options.k" }
val api = API()
val result = api.listOptions(args)

getSchemaTypeMapping

Get schema type mapping defined in the program.

Example

The content of schema.k is

schema AppConfig:
    replicas: int

app: AppConfig {
    replicas: 2
}

Kotlin Code

import com.kcl.api.API
import com.kcl.api.execProgramArgs
import com.kcl.api.getSchemaTypeMappingArgs

val args = getSchemaTypeMappingArgs { execArgs = execProgramArgs { kFilenameList += "schema.k" } }
val api = API()
val result = api.getSchemaTypeMapping(args)
val appSchemaType = result.schemaTypeMappingMap["app"] ?: throw AssertionError("App schema type not found")
val replicasAttr = appSchemaType.properties["replicas"] ?: throw AssertionError("App schema type of `replicas` not found")

overrideFile

Override KCL file with arguments. See https://www.kcl-lang.io/docs/user_docs/guides/automation for more override spec guide.

Example

The content of main.k is

a = 1

b = {
    "a": 1
    "b": 2
}

Kotlin Code

import com.kcl.api.API
import com.kcl.api.overrideFileArgs

val api = API()
val result = api.overrideFile(
    overrideFileArgs {
        file = "main.k";
        specs += spec
    }
)

formatCode

Format the code source.

Example

Kotlin Code

import com.kcl.api.API
import com.kcl.api.formatCodeArgs

val sourceCode = "schema Person:\n" +
        "    name:   str\n" +
        "    age:    int\n" +
        "    check:\n" +
        "        0 <   age <   120\n"
val args = formatCodeArgs { source = sourceCode }
val api = API()
val result = api.formatCode(args)

formatPath

Format KCL file or directory path contains KCL files and returns the changed file paths.

Example

The content of format_path.k is

schema Person:
    name:   str
    age:    int

    check:
        0 <   age <   120

Kotlin Code

import com.kcl.api.API
import com.kcl.api.formatPathArgs

val args = formatPathArgs { path = "format_path.k" }
val api = API()
val result = api.formatPath(args)

lintPath

Lint files and return error messages including errors and warnings.

Example

The content of lint_path.k is

import math

a = 1

Kotlin Code

import com.kcl.api.API
import com.kcl.api.lintPathArgs

val args = lintPathArgs { paths += "lint_path.k" }
val api = API()
val result = api.lintPath(args)

validateCode

Validate code using schema and JSON/YAML data strings.

Example

Kotlin Code

import com.kcl.api.API
import com.kcl.api.validateCodeArgs

val args = validateCodeArgs {
    code =  "schema Person:\n" + "    name: str\n" + "    age: int\n" + "    check:\n" + "        0 < age < 120\n"
    data = "{\"name\": \"Alice\", \"age\": 10}"
}
val api = API();
val result = api.validateCode(args);

rename

Rename all the occurrences of the target symbol in the files. This API will rewrite files if they contain symbols to be renamed. Return the file paths that got changed.

Example

The content of main.k is

a = 1
b = a

Kotlin Code

import com.kcl.api.API
import com.kcl.api.renameArgs

val args = renameArgs {
    packageRoot = "."
    filePaths += "./main.k"
    symbolPath = "a"
    newName = "a2"
}
val api = API()
val result = api.rename(args)

renameCode

Rename all the occurrences of the target symbol and return the modified code if any code has been changed. This API won't rewrite files but return the changed code.

Example

Kotlin Code

import com.kcl.api.API
import com.kcl.api.renameCodeArgs

val api = API()
val args = renameCodeArgs {
    packageRoot = "/mock/path"
    sourceCodes.put("/mock/path/main.k", "a = 1\nb = a")
    symbolPath = "a"
    newName = "a2"
}
val result = api.renameCode(args)

test

Test KCL packages with test arguments.

Example

Kotlin Code

import com.kcl.api.API
import com.kcl.api.testArgs

val args = testArgs {
    pkgList += "/path/to/test/package"
}
val api = API()
val result = api.test(args)

loadSettingsFiles

Load the setting file config defined in kcl.yaml

Example

The content of kcl.yaml is

kcl_cli_configs:
  strict_range_check: true
kcl_options:
  - key: key
    value: value

Kotlin Code

import com.kcl.api.API
import com.kcl.api.loadSettingsFilesArgs

val args = loadSettingsFilesArgs { files += "kcl.yaml" }
val api = API()
val result = api.loadSettingsFiles(args)

updateDependencies

Download and update dependencies defined in the kcl.mod file and return the external package name and location list.

Example

The content of module/kcl.mod is

[package]
name = "mod_update"
edition = "0.0.1"
version = "0.0.1"

[dependencies]
helloworld = { oci = "oci://ghcr.io/kcl-lang/helloworld", tag = "0.1.0" }
flask = { git = "https://github.com/kcl-lang/flask-demo-kcl-manifests", commit = "ade147b" }

Kotlin Code

import com.kcl.api.API
import com.kcl.api.updateDependenciesArgs

val api = API()
val args = updateDependenciesArgs { manifestPath = "module" }
val result = api.updateDependencies(args)

Call execProgram with external dependencies

Example

The content of module/kcl.mod is

[package]
name = "mod_update"
edition = "0.0.1"
version = "0.0.1"

[dependencies]
helloworld = { oci = "oci://ghcr.io/kcl-lang/helloworld", tag = "0.1.0" }
flask = { git = "https://github.com/kcl-lang/flask-demo-kcl-manifests", commit = "ade147b" }

The content of module/main.k is

import helloworld
import flask

a = helloworld.The_first_kcl_program

Kotlin Code

import com.kcl.api.API
import com.kcl.api.execProgramArgs
import com.kcl.api.updateDependenciesArgs

val api = API()
val args = updateDependenciesArgs { manifestPath = "module" }
val result = api.updateDependencies(args)
val execArgs = execProgramArgs {
    kFilenameList += "module/main.k"
    externalPkgs.addAll(result.externalPkgsList)
}
val execResult = api.execProgram(execArgs)

getVersion

Return the KCL service version information.

Example

Kotlin Code

import com.kcl.api.API
import com.kcl.api.getVersionArgs

val api = API()
val args = getVersionArgs {}
val result = api.getVersion(args)