rshell

An interpreted programming language featuring static types and a unique functional syntax.

Building

To build the project, navigate to the root directory of the project and run:

cargo build

Running

To run the project, use the following command:

cargo run

That will bring you into a REPL. Everything in rshell functions as a function and there is no syntax other than functions and data (no keywords) and that is done by design to make it simple.

Commands

Built-in functions and keywords

• let(name, type(value)) - Variable and function declaration
• func(param1, param2, ..., return_type, body) - Defines a new function (technically an anonymous function)
• if(condition), then_expr, else_expr) - Conditional expression
• pass() - A no-op that does nothing

Arithmetic

• Note that the order of operations is most nested to least nested
• +(a, b, ...) - Add two or more numbers
• -(a, b, ...) - Subtract two or more numbers
• *(a, b, ...) - Multiply two or more numbers
• /(a, b, ...) - Divide two or more numbers
• %(a, b, ...) - Add two or more numbers

Comparison

• <(a, b) - Less than
• <=(a, b) - Less than or equal to
• >(a, b) - More than
• >=(a, b) - More than or equal to
• ==(a, b) - Equal to
• !=(a, b) - Not equal to

Logical

• and(a, b) - Logical AND
• or(a, b) - Logical OR
• not(a) - Logical NOT
• xor(a, b) - Logical XOR

Utility functions

• echo(...) - prints the argument to the console
• float(x) - casts an integer to a float
• len(string) - Returns the length of a string
• reverse(string) - Reverses a string

Examples

let(square, func(int(x), int, *(x, x)))
let(cube, func(int(x), int, *(x, x, x)))

You can type exit to leave the REPL.