HappyScript
A simple, educational programming language implemented in C++. It supports variables, operators, control flow, and print statements — making it great for learning interpreters and language design.
Variables
Supports integers, floats, and strings with simple declarations.
Operators
Arithmetic: +, -, *, /, %
Comparison: ==, !=, <, >, <=, >=
Control Flow
ana = if, elsa = else, fun = while.
Printing
Output values using smile().
Blocks
Group statements with { ... } for structured logic.
Educational
Designed to be readable and extendable — perfect for learning.
Installation
1. Manual Build
git clone https://github.com/Matei-thecoder/happyscript.git cd happyscript g++ -std=c++17 -o happyscript main.cpp lexer.cpp parser.cpp interpreter.cpp
2. Or using CMake - make sure you have CMake installed
git clone https://github.com/Matei-thecoder/happyscript.git cd happyscript mkdir build cd build cmake .. make
Usage
Write your Happyscript code in a file, in the same directory with the happyscript executable, e.g. test.happy:
int x = 5;
fun (x > 0) {
smile(x);
x = x - 1;
}Run the interpreter:
./happyscript test.happy
This will execute your Happyscript program and print the output.
Example - code snippet
int x = 10;
float y = 2.0;
string z = "Hello ";
string h = "World!";
fun (x >= 0) {
ana (x % 2 == 0) {
smile(x+y);
} elsa {
smile(z+h);
}
x = x - 1;
}Language Rules
Statement Termination
Every statement in Happyscript must end with a semicolon (;). This ensures clarity and consistency in parsing and avoids ambiguity for the interpreter.
Supported Types
Happyscript supports three main types: int for integers, float for decimal numbers, and string for sequences of characters. Choose the type according to the data you want to store.
String Concatenation
You can concatenate only two strings at a time using the + operator. For example, "hello" + "world" works, but combining a string with a number like "hello" + 1 is invalid. This keeps the language simple and type-safe.
Type Safety
Happyscript enforces strict type safety: you cannot add or concatenate numbers with strings. For example, 5 + "hello" is invalid. This helps beginners learn proper type usage and avoids runtime errors.
Keyword Fun & Anecdote
In Happyscript, traditional programming keywords have been replaced as a playful twist:
if→anaelse→elsawhile→funprint→smile
The choices are intentional: fun and smile reflect the "Happy" theme of the language name. ana and elsa were chosen as an inside joke with a friend when I started coding. This adds a bit of personality and makes learning more fun!