import statement and -- @module directive

[RyanSquared]

• @module directive
• import

import

To help with using #4 across multiple files, the compiler should be aware of enums that are used cross-process. The import statement can be used to direct the compiler to both scan the module for enumerations, as well as load values from the module:

--- FusionScript
import stdlib.error {
    BaseError;
};

--- Lua
local _des_0 = require("stdlib.error")
local BaseError = _des_0.BaseError

---

All values can be extracted from a module, but many linters would not be aware of this. The syntax will also only work if the module has a module directive at the top of the file.

--- FusionScript
import stdlib.error *;

--- Lua
local _des_0 = require("stdlib.error")
local BaseError, Error, assert = _des_0.BaseError, _des_0.Error, _des_0.assert

---

Enumerations can also be included but will not show up in the compiled output:

--- FusionScript - example.fuse
import connections {
    ConnectionType;
};
print(ConnectionType.INET);
--- FusionScript - connections.fuse
-- @module connections
enum ConnectionType {
    INET;
    INET6;
    UNIX;
};

--- Lua - example.lua
print(1);
--- Lua - connections.lua
_ENV = setmetatable({}, {__index = _G})
return _ENV

---

An entire module can be loaded into a table, instead of having values destructured into the local scope:

--- FusionScript
import stdlib.error => error;

--- Lua
local error = require("stdlib.error");

-- @module directive

A comment that matches the pattern -- @<directive> [parameter] is considered a directive. When parsing a file, the compiler will take advantage of these comments to produce output that better matches the type of file. The -- @module directive (with a single required parameter, the name of the module) instructs the compiler that the following file should be treated as a module, which will set the environment to a contained table (to prevent leaking of values assigned globally) and return the table at the end of the file:

--- FusionScript - example.fuse
-- @module example

printf(fmt, ...)=>
    print(string.format(fmt, ...));

_ENV = setmetatable({}, {__index = _G})
function printf(fmt, ...)
    print(string.format(fmt, ...))
end
return _ENV