moss is a simple programming language written in rust and c. it's a personal project for learning rust and compiler. just for curiosity.

moss version of fibonacci implementation.

fun fib(n) {
  if (n < 2) return n;
  return fib(n - 1) + fib(n - 2); 
}

var before = clock();
print fib(40);
var after = clock();
print after - before;

as we can see,it implement the minimal feature of a function based programming language. since now, print is not a function, it's a keyword, and clock is a function, it's a built-in function.

we can declare a function by fun keyword, and call a function by function_name(arguments). we can declare a variable by var keyword, and assign a value to a variable by variable_name = value. moss support if,while,for statement, and + - * / operator. the primitive type:

• number: which is f64 in rust
• string: just a string
• boolean: true or false

cargo install

if you want a repl to try moss, you can use cargo run to run moss.

cargo run

if you want to run a moss file, you can use cargo run to run moss.

cargo run ./test_file/test_while.moss

run test,both unit test and integration test.

cargo test

cmoss is moss lang backend,written in c. document

[ ] implement a backend of moss,based on byteCode,which is more efficient than ast. [ ] implement a standard library of moss,which is more useful than just a print and clock. [ ] build a wasm version for moss, and build a web playground for it;

• lexer ( aka scanner )
• var expression
• math compute
• assignment expression
• i++ i-- ++i --i += -= *= /=
• if expression
• while expression
• function call expression
• function define expression
• array expression
• object expression
• scoping and scop resolve
• class statement

• blank string parse

• use nom refact lexer

• number: f64
• string: String
• boolean: bool
• nil