Arpelle

Toy compiler and scripting language that is very much a work in progress. It produces C++ code. This was my summer project because I was unemployed and I wanted to learn about compilers.

Based off the TeenyTinyCompiler by @AZHenley, built in .NET 5 and C# instead of Python.

Installation and Usage

I'll add binaries to the Release tab when I feel the project is far enough along to be considered "stable".

All you need is .NET 5 (SDK) and to run dotnet build in the root folder. The built file will be in the bin/Debug/net5.0 folder.

Command Line Usage:

arplc <input> [output]

When output is not given, it'll default to arplc_output in the current directory.

Language

The language is BASIC like, kinda Python like.

Here's an incredibly simply program I use to test the features I've implemented so far.

Set a As Number = 0
Set b As Number = 1
Set hello As String = "Hello World"
Set flag As Boolean = True

If flag == True Then
    Printout hello
    Set a = 1
    Set b = 2
    Input hello
Else
    Printout "Not Hello World!"
End

While flag == True Repeat
    Printout hello
    Printout a
    Printout b
End

Variable Assignment

Set a variable with a given datatype:

Set <variable_name> AS <data_type> = <value>

Valid datatypes so far are Number (will automatically detect a float or integer), Boolean (True or False), and String

You can also reassign a variable, calculations aren't allowed yet but I'll add it eventually.

Set <variable_name> = <value>

Console IO

Print a variable or string:

Printout <value/variable>

Get input and assign it to a variable. The variable must be set before hand with an initial value.

Input <variable>

Control Structures and Loop

The compiler doesn't force any tab formatting, I just think it looks nice.

End should always end a block of code.

If and Else statements:

If <expression> Do
    <code>
Else
    <code>
End

While statements:

While <expression> Repeat
    <code>
End