Sauvignon

Sauvignon is a tree walking interpreter written in Rust.

Building

Rust 2018 is required to compile this project. Currently, there are no additional dependencies.

$ cargo build

Quick start syntax

Start the REPL using

$ cargo run

or

$ cargo build
$ ./target/debug/sauvignon

Data Types

Supported data types

• Integer
• Boolean
• String

Mathematical expressions

Do integer arithmetic using +, -, *, and /.

(3+2) * 3
(6 - 1) / 5
20 / 4 - 5

Variable binding

Objects can be assigned to identifiers using let <ident> = <object>.

let thirty = 30;

Functions

Declare functions using the fn keyword.

let add = fn (a, b) {
   return a + b
}

After declaring, you can call the functions.

add(5, 2)

Conditionals

Conditional control flow can be achieved using if statements.

let a = 5;
if ( a != 5 ) {
  return false;
} else {
  return true;
}

String

String concatenation works using the + infix operator.

"I like " + "CHEESECAKE!"

TODO:

• Basic Lexer
• Extended Lexer
• REPL
• AST constructor
• Parser
• Internal object system
• Evaluator
• Built-in functions
• Arrays
• Hash maps
• Module import