space

space is an interpreter for the Whitespace esoteric programming language.

Basic Running

val ws = File(path)
// This can also be a string as well

val lexer = Lexer()
val lexed = lexer lex ws

val parser = Parser()
// You can choose to define any OutputStream, with the default being System.out

// If you want to use any form of input, just do System.setIn(...)
val program = parser parse lexed
program.evaluate()

Program Builder DSL

val program = buildProgram {
    numbers(0, 33, 100, 108, 114, 111, 119, 32, 111, 108, 108, 101, 72)

    +CallSubroutineInstruction(0)

    label(0) {
        +DuplicateInstruction()
        +JumpZeroInstruction(1)
        +PrintCharInstruction()
        +JumpInstruction(0)
    }

    label(1) {
        +DiscardInstruction()
        +EndProgramInstruction()
    }
}

program.evaluate()

Which outputs:

Hello world!

Exporting to File

If you want to export the generated program to a file, you can choose to either write the program contents to a file, or create a ProgramBuilder and to file there.

// With the same program from above
val wsText = program.toWhitespace()

val file = File(path)
file.writeText(wsText)

or

val builder = ProgramBuilder()
builder.add {
    ...
}

val file = builder.exportToFile(path)

Printing a Whitespace Program

After parsing a Whitespace program, it may also be of interest to see a more readable program structure. Unless you have some form of syntax highlighting for .ws files, there is nothing to see. That's why I allowed for any program to be printed in a beautiful, easy to understand way.

// Printing the program that outputs "Hello world!"
println(program)

Which outputs:

push 0
push 33
push 100
push 108
push 114
push 111
push 119
push 32
push 111
push 108
push 108
push 101
push 72
call 0
label 0:
    dup
    jumpzero 1
    printchar
    jump 0

label 1:
    discard
    end

Which looks much more readable than: