Syntax

The Wheel syntax looks a little bit like Pascal or Basic.

One command per line

Wheel only allows a single command or expression per line, the only exception is an assignment of a record or array.

proc main()
    number n = 1
end

An example of a multi line variable assignment:

proc main()
    number p[2][3] = [
               [90, 100, 110],
               [220, 230, 240]
           ]
end

Comments

A semicolon (";") marks the beginning of a comment.

proc main()
    ; This is a comment and will not be executed...
end

Comments should be placed after the command or expression. Wheel only supports single line comments, everything after the simicolon is seen as a comment text.

Code blocks

Wheel uses a block structure which begins with the declaration of the type or command followed by an expression and closed with an end statement.

struct MyStruct
    number
end

proc main()
end

Some statements can be nested:

struct MyStruct
    number
end

proc main()
    number a = 1
    number b = 0

    if a == 1
        if (b == 1) ; Parentheses are optional here...
            printS("A and B are 1")
        end
    else
        printS("A is not 1")
    end
end

Numbers

Number values can be declared as decimal, binary or hexadecimal.

proc main()
    number n = 10
    number b = 0b01001
    number h = 0x2AE
end

Meta commands

Meta commands are parsed by the preprocessor.
A meta command starts with the "#" character and must be the first command on the line.
With the include command you can import an existing file like a library.

#include "lib/modules/screen.whl"

proc main()
    drawNumber(10, 5, 90)
end