Pengiie / Pengo

A hobby programming language

Pengo

A very simple C based language written in C++
A small hobby project written in ~10 days

The language is purely interpreted and parsed with an LALR(1) parser

How to use

Run any file by running the .exe with the file name as an argument

In Windows PowerShell:

./Pengo.exe fileName.pgo

You can also add a -d at the end to show the parse tree of the file

./Pengo.exe fileName.pgo -d

Features

• Math order of operations evaluation
• Variables
• Functions
• Built in language functions
• If, Elif, and Else conditional statements
• While loops
• Scoping

Examples

Hello World

println("Hello World!");

Output:

Hello World!

Input

print("Enter a number: ");
number = int(input());
println("You entered "+number+"!");

Output:

Enter a number: 3
You entered 3!

Functions

func add(left, right)
{
  return left + right;
}
println("3 + 4 = "+add(3,4));

Output:

3 + 4 = 7

Counter

counter = 0;
while(counter <= 10)
{
  println(counter);
  counter = counter + 1;
}

Output:

0
1
2
3
4
5
6
7
8
9
10

Conditional

println("What is the password?");
in = input();
if(in == "123")
  println("Access Granted!");
else
  println("Access Denied!");

Output:

What is the password?
123
Access Granted!

Function Variables

// Sets variable equal to a built in function
p = println;
p("This prints!");

func math(operation)
{
  func add(left, right)
  {
    return left + right;
  }
  func subtract(left, right)
  {
    return left - right;
  }
  if(operation == "add")
    return add;
  elif(operation == "subtract")
    return subtract;
}

result = math("add")(4, 2);
println("Result is "+result);

result = math("subtract")(4, 2);
println("Result is "+result);

Output:

This prints!
Result is 6
Result is 2