While Language

A minimalistic programming language built using Scala 3.6 and ANTLR 4.13.

This simple programming language features a single loop construct (while) and supports only integer types.

The language is implemented in two distinct ways:

• As an interpreter
• As a transpiler (source-to-source compiler) targeting Scala.

	Interpreter	Transpiler (Compiler)
Grammar	Grammar (29 lines)
Abstract Syntax	Abstract Syntax (23 lines)
Semantics	Semantics (35 lines)	Semantics (34 lines)
Parser Rules	Listener (56 lines)
Main	Main (4 lines)	Main (4 lines)
Utility Classes	Walker (20 lines) Runner (14 lines) ContextValue (13 lines)
Total	194 lines	193 lines

Examples

Below are some example programs:

Hello World

print "Hello World"

Sum of Two Numbers

print "Enter the first number:";
a := read;
print "Enter the second number:";
b := read;
sum := a + b;
print "The sum is: ";
print sum

Fibonacci Sequence

print "Fibonacci Sequence";
a := 0;
b := 1;
while b <= 1000000 do {
  print b;
  b := a + b;
  a := b - a
}

---

Compiling and Running

To compile the project, you'll need to install sbt. The easiest installation method is via SDKMAN! (Linux) or Scoop (Windows).

$ sbt
sbt> clean
sbt> compile

# Run the interpreter
sbt> runMain whilelang.interpreter.main sum.while

# Run the transpiler
sbt> runMain whilelang.compiler.main sum.while