dependencies: [
    .package(url: "https://github.com/fumiya-kume/FeLangKit.git", from: "1.0.0")
]

import FeLangCore

let tokenizer = Tokenizer(input: "x ← 1 + 2")
let tokens = try tokenizer.tokenize()

let expressionParser = ExpressionParser()
let expression = try expressionParser.parseExpression(from: tokens)

let statementParser = StatementParser()
let statements = try statementParser.parseStatements(from: tokens)

import FeLangRuntime

let interpreter = Interpreter.withCustomIO(
    printHandler: { text in /* Display output in UI */ },
    inputHandler: { /* Get input from UI */ return nil }
)
try interpreter.execute("x: integer ← 42\nprint(x)")

import FeLangServer

let (server, transport) = LanguageServer.createInMemory()
Task { await server.run() }

await transport.sendInitialize()
await transport.sendDidOpen(uri: "file:///main.fe", content: sourceCode)

for await message in transport.output {
    switch message {
    case .response(let response):
        // Handle response
    case .notification(let method, let params):
        // Handle diagnostics etc.
    }
}