Native code

The code written in the C language can be embedded in a BlueScript program. The string literal surrounded with backquotes following code is directly embedded in the C program after transpilation.

code`#include <math.h>`

function sqrt(x: float): float {
  let r: float
  code`${r} = sqrt(${x})`
  return r
}

print(sqrt(9.0))

A BlueScript variable is referred to by ${}. The content between ${ and } must be a variable name or this object's property. For example above, ${x} adn ${r} refer to the BlueScript variable x and r respectively. The embedded C code calls the function sqrt in the standard C library and assigns the retrun value to the BlueScript variable r. The argument passed to sqrt is the value of the BlueScript variable x.

To suppress an error message by a TypeScript editor, declare this function:

function code(strings: any, ... keys: any[]) {}

BlueScript ignores this function declaration.