Hoshi-lang has a simple conditional compilation feature that works like a macro system. This allows you to include or exclude code based on flags passed to the compiler.

Syntax

The syntax for a macro is a double-bracketed expression:

[[<key> <operator> <value>]]

<key>: The name of the macro.
<operator>: One of ==, !=, <, >, <=, >=.
<value>: The value to compare against.

If the condition is true, the code immediately following the macro will be included in the compilation. Otherwise, it will be ignored.

Pre-defined Macros

Hoshi-lang provides the following pre-defined macros:

platform: The operating system the compiler is running on ("darwin", "linux", or "win32").
arch: The architecture the compiler is running on (e.g., "x86_64", "arm64").
hoshi_feature_version: The version of the Hoshi-lang language.
hoshi_lang_commit: The git commit hash of the Hoshi-lang compiler.

Custom Macros

You can define your own macros using the -D or --define flag when compiling:

./hoshi_lang -D my_macro 123 my_file.hoshi

Example

use runtime "runtime"
 
func main() : int {
    [[platform == "darwin"]] runtime.puts("Hello, world from macOS!")
    [[platform == "linux"]] runtime.puts("Hello, world from Linux!")
    [[platform == "win32"]] runtime.puts("Hello, world from Windows!")
    return 0
}

In this example, the appropriate puts call will be included based on the operating system the code is compiled on.