example.du

// Example Duso script demonstrating syntax highlighting and features
// This file showcases the language features supported by the Zed extension

// Comments
/* Multi-line comment
   This extension provides syntax highlighting
   and LSP support for Duso scripts
*/

// Variables and types
name = "Duso" // inline comment not highlighting as a comment...
version = 0.22
active = true
numbers = [1, 2, 3, 4, 5]
config = {timeout = 30, retries = 3}

// String templates
greeting = "Hello, {{name}}!"
message = """
  This is a multi-line string
  with {{version}} and features
"""

// Basic control flow
if active then
  print("Starting script...")
elseif version > 0.2 then
  print("Legacy version")
else
  print("Inactive")
end

// Loops
for item in numbers do
  print("Item:", item)
end

for i = 0, 5 do
  print("Index:", i)
end

while true do
  input_value = input("Enter something: ")
  if input_value == "quit" then
    break
  end
  print("You said:", input_value)
end

// Functions
function calculate(a, b, operation)
  if operation == "add" then
    return a + b
  elseif operation == "multiply" then
    return a * b
  else
    throw("Unknown operation: " + operation)
  end
end

result = calculate(5, 3, "add")
print("5 + 3 =", result)

// Ternary operator
status = version > 0.2 ? "stable" : "beta"
print("Status:", status)

// Error handling
try
  file_content = load("data.json")
  data = parse_json(file_content)
catch (error)
  print("Error reading file:", error)
end

// Built-in functions
print("Math operations:")
print("abs(-10) =", abs(-10))
print("sqrt(16) =", sqrt(16))
print("max(3, 7) =", max(3, 7))

// Array operations
items = ["apple", "banana", "cherry"]
print("First item:", items[0])
print("Array length:", len(items))

mapped = map(items, function(item)
  return upper(item)
end)

print("Uppercase items:", mapped)

// String operations
text = "duso language"
print("Upper:", upper(text))
print("Contains 'language':", contains(text, "language"))
print("Substring:", substr(text, 0, 4))

// Parallel execution (advanced)
results = parallel(
  function()
    return "First result"
  end,
  function()
    return "Second result"
  end,
  function()
    return "Third result"
  end
)
print("Parallel results:", results)

// HTTP requests
response = fetch("https://api.example.com/data")
if response.status == 200 then
  api_data = parse_json(response.body)
  print("API Response:", api_data)
end

// Module imports
math_utils = require("math")
result = math_utils.complex_calculation()

// Object construction
person = {
  name = "Alice",
  age = 30,
  skills = ["Duso", "Go", "Python"]
}
print("Person:", person.name, "Age:", person.age)

// Datastore (for concurrent access)
store = datastore()
store.set("key", "value")
stored = store.get("key")
print("Stored value:", stored)

print("\nScript completed!")