errors.nct

//! Stable JSON input failure construction.

see ./failure.nct

use /fmt.try_append_usize
use /mem.TryAllocator
use /string.String

func input_failure<T>(
    allocator: &+TryAllocator,
    code: &str,
    message_prefix: &str,
    offset: usize,
): Attempt<T> {
    var message = String.try_copy(allocator, message_prefix) catch failure {
        return Attempt.allocation(move failure)
    }
    try_append_usize(&+message, offset) catch failure {
        return Attempt.allocation(move failure)
    }
    return Attempt.input(error.new(code, &message))
}

func invalid_syntax<T>(allocator: &+TryAllocator, offset: usize): Attempt<T> {
    return input_failure(
        allocator,
        "std.json.invalid_syntax",
        "invalid JSON syntax at byte ",
        offset,
    )
}

func duplicate_name<T>(allocator: &+TryAllocator, offset: usize): Attempt<T> {
    return input_failure(
        allocator,
        "std.json.duplicate_name",
        "duplicate JSON object name at byte ",
        offset,
    )
}