Dew is a little programming language which targets the Lua virtual machine.

Language

Examples

1 + (2 + 3) * (4 - 5)
fun f
fun f(x, y int)
fun f(x, y int) int
fun f(x, y int) int, int
fun f(x, y int) (int, int)
fun ♥︎(x, y, z int) int, int {
	return x + y*z
}

Operators

+    &     +=    &=     &&    ==    !=    (    )
-    |     -=    |=     ||    <     <=    [    ]
*    ^     *=    ^=     <-    >     >=    {    }
/    <<    /=    <<=    ++    =     :=    ,    ;
%    >>    %=    >>=    --    !     ...   .    :
~

Operator precedence

Binary operators of the same precedence associate from left to right. E.g. x / y * z is the same as (x / y) * z.

7  .
6  ++  --  +  -  !  ~  *  &  ?
5  *  /  %  <<  >>  &
4  +  -  |  ^
3  ==  !=  <  <=  >  >=
2  &&
1  ||
0  ,

Building dew

make && o.*/dew examples/hello.dew

Requirements:

• C17 compiler (tested with clang 17)
• GNU Make
• curl for wasm build

Various ways to build:

• make — release build for host system
• make DEBUG=1 — debug build for host system
• make TARGET=web — release build for web platform
• make TARGET=web DEBUG=1 — debug build for web platform
• make test — build & run tests