Ducklang

A toy language to learn programming language.
Written in Rust with pest PEG parser.

Currently implemented:

• number (i64), boolean, string, char and functions
• + - * / % arithmetic operators
• < > <= >= == != && || ! boolean operators
• variables
• if else conditional, while loop, break and continue keyword
• functions as variables
• indexing for string
  

Example

/*
An example of program with most of
the supported features
*/
x = true;
z = 3 + 4 * (2 + 1); // good order of op
if (x) {
	y = 5;
	while (x) {
		if (!y && z % 2) {
			z = 8;
			break;
		} else if (y == 3) {
			z = 5;
		}
		y = y - 1;
	}
} else {
	// never reached
	y = -8;
	x = true;
}

Final state of the program environment:

var: y => val: 0
var: x => val: true
var: z => val: 8

TODO

syntax

• functions OK
• print statement OK
• string / char => indexing OK / escaping OK
• local scope for { statements } OK
• array OK => len keyword OK
• read / write => file, standard io
• sleep
• program arguments
• tuple
• dict
• standard lib ?
• types declaration
• type checking before runtime
• types inference
• structs => methods (list container?)
• read / write => network sockets
• for loop and iterators NOK
• pow / bitwise / bitshift operators
• range
• import from other files
• ast unit tests
• check and enhance parsing error printing

playground

• compile time inclusion of the example program
• syntax color
• line numbers
• better panel title
• panel tabs
• print / string => language
• console for print

tools

• repl
• LLVM IR translation
• JIT
• compilation