Modules

MLang supports splitting code across multiple files using module and import.

Declaring a module

Use module <name> at the top of a file to declare its namespace:

module adder

int add(int a, int b) {
    return a + b;
}

int subtract(int a, int b) {
    return a - b;
}

Importing a module

Use import "<path>" at the top of your main file:

import "adder.mth"

main() {
    print(adder::add(5, 3))       # 8
    print(adder::subtract(10, 4)) # 6
}

Paths are relative to the importing file. Circular imports are detected and reported as errors.

Qualified call syntax

Imported functions are called with module::function(args):

import "math.mth"

main() {
    print(math::double(7))   # 14
    print(math::square(4))   # 16
}

Rules

• module declaration is required in every module file
• import is only valid at the top level of the main file
• Module files cannot have a main() function
• Multiple modules can be imported in one file