Python API

Installation

python3 -m pip install kcl-lib

Quick Start

import kcl_lib.api as api

args = api.ExecProgram_Args(k_filename_list=["path/to/kcl.k"])
api = api.API()
result = api.exec_program(args)
print(result.yaml_result)

API Reference

exec_program

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
}

Python Code

import kcl_lib.api as api

args = api.ExecProgram_Args(k_filename_list=["schema.k"])
api = api.API()
result = api.exec_program(args)
assert result.yaml_result == "app:\n  replicas: 2"

A case with the file not found error

Example

import kcl_lib.api as api

try:
    args = api.ExecProgram_Args(k_filename_list=["file_not_found"])
    api = api.API()
    result = api.exec_program(args)
    assert False
except Exception as err:
    assert "Cannot find the kcl file" in str(err)

parse_file

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
}

Python Code

import kcl_lib.api as api

args = api.ParseFile_Args(path=TEST_FILE)
api = api.API()
result = api.parse_file(args)
assert len(result.errors) == 0

parse_program

Parse KCL program with entry files and return the AST JSON string.

Example

The content of schema.k is

schema AppConfig:
    replicas: int

app: AppConfig {
    replicas: 2
}

Python Code

import kcl_lib.api as api

args = api.ParseProgram_Args(paths=["schema.k"])
api = api.API()
result = api.parse_program(args)
assert len(result.paths) == 1
assert len(result.errors) == 0

load_package

load_package 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
}

Python Code

import kcl_lib.api as api

args = api.LoadPackage_Args(
    parse_args=api.ParseProgram_Args(paths=["schema.k"]), resolve_ast=True
)
api = api.API()
result = api.load_package(args)
assert list(result.symbols.values())[0].ty.schema_name == "AppConfig"

list_variables

list_variables 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
}

Python Code

import kcl_lib.api as api

args = api.ListVariables_Args(files=[TEST_FILE])
api = api.API()
result = api.list_variables(args)
assert result.variables["app"].variables[0].value == "AppConfig {replicas: 2}"

list_options

list_options 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")
}

Python Code

import kcl_lib.api as api

args = api.ParseProgram_Args(paths=["options.k"])
api = api.API()
result = api.list_options(args)
assert len(result.options) == 3
assert result.options[0].name == "key1"
assert result.options[1].name == "key2"
assert result.options[2].name == "metadata-key"

get_schema_type_mapping

Get schema type mapping defined in the program.

Example

The content of schema.k is

schema AppConfig:
    replicas: int

app: AppConfig {
    replicas: 2
}

Python Code

import kcl_lib.api as api

exec_args = api.ExecProgram_Args(k_filename_list=["schema.k"])
args = api.GetSchemaTypeMapping_Args(exec_args=exec_args)
api = api.API()
result = api.get_schema_type_mapping(args)
assert result.schema_type_mapping["app"].properties["replicas"].type == "int"

override_file

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
}

Python Code

import kcl_lib.api as api
import pathlib

test_file = "main.k"
args = api.OverrideFile_Args(
    file=test_file,
    specs=["b.a=2"],
)
api = api.API()
result = api.override_file(args)
assert len(result.parse_errors) == 0
assert result.result == True
assert pathlib.Path(test_file).read_text() == """\
a = 1
b = {
    "a": 2
    "b": 2
}
"""

format_code

Format the code source.

Example

Python Code

import kcl_lib.api as api

source_code = """\
schema Person:
    name:   str
    age:    int

    check:
        0 <   age <   120
"""
args = api.FormatCode_Args(source=source_code)
api_instance = api.API()
result = api_instance.format_code(args)
assert (
    result.formatted.decode()
    == """\
schema Person:
    name: str
    age: int

    check:
        0 < age < 120

"""
    )

format_path

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

Python Code

import kcl_lib.api as api

args = api.FormatPath_Args(path="format_path.k")
api_instance = api.API()
result = api_instance.format_path(args)
print(result)

lint_path

Lint files and return error messages including errors and warnings.

Example

The content of lint_path.k is

import math

a = 1

Python Code

import kcl_lib.api as api

args = api.LintPath_Args(paths=["lint_path.k"])
api_instance = api.API()
result = api_instance.lint_path(args)

validate_code

Validate code using schema and JSON/YAML data strings.

Example

Python Code

import kcl_lib.api as api

code = """\
schema Person:
    name: str
    age: int

    check:
        0 < age < 120
"""
data = '{"name": "Alice", "age": 10}'
args = api.ValidateCode_Args(code=code, data=data, format="json")
api_instance = api.API()
result = api_instance.validate_code(args)
assert result.success == True
assert result.err_message == ""

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

Python Code

import kcl_lib.api as api

args = api.Rename_Args(
    package_root=".",
    symbol_path="a",
    file_paths=["main.k"],
    new_name="a2",
)
api_instance = api.API()
result = api_instance.rename(args)

rename_code

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

Python Code

import kcl_lib.api as api

args = api.RenameCode_Args(
    package_root="/mock/path",
    symbol_path="a",
    source_codes={"/mock/path/main.k": "a = 1\nb = a"},
    new_name="a2",
)
api_instance = api.API()
result = api_instance.rename_code(args)
assert result.changed_codes["/mock/path/main.k"] == "a2 = 1\nb = a2"

test

Test KCL packages with test arguments.

Example

Python Code

import kcl_lib.api as api
args = api.Test_Args(
    pkg_list=["path/to/testing/pkg/..."],
)
api_instance = api.API()
result = api_instance.test(args)

load_settings_files

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

Python Code

import kcl_lib.api as api

args = api.LoadSettingsFiles_Args(
    work_dir=".", files=["kcl.yaml"]
)
api_instance = api.API()
result = api_instance.load_settings_files(args)
assert result.kcl_cli_configs.files == []
assert result.kcl_cli_configs.strict_range_check == True
assert (
    result.kcl_options[0].key == "key" and result.kcl_options[0].value == '"value"'
)

update_dependencies

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" }

Python Code

import kcl_lib.api as api

args = api.UpdateDependencies_Args(
    manifest_path="module"
)
api_instance = api.API()
result = api_instance.update_dependencies(args)
pkg_names = [pkg.pkg_name for pkg in result.external_pkgs]
assert len(pkg_names) == 2
assert "helloworld" in pkg_names
assert "flask" in pkg_names

Call exec_program 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

Python Code

import kcl_lib.api as api

args = api.UpdateDependencies_Args(
    manifest_path="module"
)
api_instance = api.API()
result = api_instance.update_dependencies(args)
exec_args = api.ExecProgram_Args(
    k_filename_list=["module/main.k"],
    external_pkgs=result.external_pkgs,
)
result = api_instance.exec_program(exec_args)
assert result.yaml_result == "a: Hello World!"

get_version

Return the KCL service version information.

Example

Python Code

import kcl_lib.api as api

api_instance = api.API()
result = api_instance.get_version()
print(result.version_info)