Programming Language

Nocter

A self-contained systems language built around simplicity, encapsulation, and foolproof design.

Specification GitHub

use std/io

blocking func main(): i32! {
    io.print("Hello from Nocter\n")?
    return 0
}

use std/io
use std/vec.Vec

struct Counter {
    value: i32
}

blocking func main(): i32! {
    var counters = Vec [Counter { value: 1 }, Counter { value: 2 }, Counter { value: 3 }]
    for counter in &+counters {
        counter.value += 10
    }

    var borrowed_total: i32 = 0
    for counter in &counters {
        borrowed_total += counter.value
    }

    var moved_total: i32 = 0
    for counter in move counters {
        moved_total += counter.value
    }

    let message = "borrowed: ${borrowed_total}, moved: ${moved_total}\n"
    io.print(&message)?
    return 0
}

func main(): i32 {
    let value = load_value() catch failure { fallback_for(failure.message()) }
    if value == 42 {
        return 0
    }
    return 1
}

func load_value(): i32! {
    return error.new("example.unavailable", "the primary value is unavailable")
}

func fallback_for(message: &str): i32 {
    return 42
}

use std/task
use std/time
use std/time.Duration

async func delayed(value: i32): i32 {
    await time.sleep(Duration.from_milliseconds(1))
    return value
}

async func main(): i32! {
    let (left, right) = await task.join(delayed(20), delayed(22))
    if left + right != 42 {
        return error.new("example.unexpected_total", "joined tasks returned the wrong total")
    }
    return 0
}

use std/io
use std/url.Url

blocking func main(): i32! {
    let url = Url.parse("HTTP://Example.COM:80/a/../status?q=ready#fragment")?
    let canonical = url.to_string()
    let authority = url.authority()
    let target = url.request_target()
    io.println(&canonical)?
    io.println(&authority)?
    io.println(&target)?
    return 0
}

index.nct

#package: {
    name: "file-summary",
    version: "0.1.0",
}

#executable: {
    name: "file-summary",
}

use std/fs
use std/cli.Application
use std/io
use std/path.Utf8Path

see ./summary.nct

blocking func main(): i32! {
    var application = Application.new("file-summary", "Count lines in one UTF-8 file.")?
    application.add_positional("PATH", true, "File to read.")?
    let arguments = application.parse_process() catch failure {
        if !failure.has_code("std.cli.missing_positional")
        && !failure.has_code("std.cli.unexpected_positional") {
            return move failure
        }
        let usage = application.usage()
        io.print(&usage)?
        io.print("\n")?
        return 2
    }
    let requested = arguments.positional("PATH") otherwise { return 2 }
    let path = Utf8Path.new(requested)?
    let text = fs.read_to_string_blocking(&path)?
    let lines = count_lines(&text)
    let result = lines.to_string()
    io.print(&result)?
    io.print("\n")?
    return 0
}