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Kotlin parser in pure Python

Project description


Kopyt is a Kotlin programming language parser in pure Python, inspired by javalang library.


pip install -U kopyt


  • Supports Kotlin 1.5
  • Zero dependency


  • Python 3.7+


from kopyt import Parser, node

code = """\
package main

import a.b
import x.y.z.*

fun main() {
    println("Hello, world!")

parser = Parser(code)
result = parser.parse()

assert result.package is not None
assert == "main"

assert len(result.imports) == 2
assert result.imports[0].name == "a.b"
assert result.imports[1].name == "x.y.z"
assert result.imports[1].wildcard

assert len(result.declarations) == 1
assert isinstance(result.declarations[0], node.FunctionDeclaration)
assert result.declarations[0].name == "main"
assert result.declarations[0].position.line == 6

print(result) # this will output a string similar to the original code

All nodes and its members can be found on kopyt/

Partial Parsing

It is possible to parse partial Kotlin code, for example you want to parse a function declaration:

from kopyt import Parser, node

code = "fun plusOne(x: Int) = x + 1"
parser = Parser(code)
result = parser.parse_function_declaration()

assert == "plusOne"
assert len(result.parameters) == 1
assert result.parameters[0].name == "x"

All parse functions can be found on kopyt/

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