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

//! Explicit projection of structured command-line results into configuration candidates.

use /cli.ParsedArguments
use /config.Source

see ./projection.nct
see ./tests.nct

/// Adds `value` as a Boolean candidate when `option` occurred as a flag.
pub func add_flag(
    destination: &+Source,
    arguments: &ParsedArguments,
    field: &str,
    option: &str,
    value: bool,
): void!

/// Adds the single textual value supplied to `option`, or nothing when it was absent.
///
/// A repeated option is rejected because one configuration field accepts one candidate per source.
pub func add_option(
    destination: &+Source,
    arguments: &ParsedArguments,
    field: &str,
    option: &str,
): void!

/// Adds the textual value supplied to `positional`, or nothing when it was absent.
pub func add_positional(
    destination: &+Source,
    arguments: &ParsedArguments,
    field: &str,
    positional: &str,
): void!