This is an interpreter for Asobu, a toy programming language. The current goal is to implement a simple functional programming language with support for basic numeric operations and if expressions.
The following is the current syntax specification for Asobu version 1.0
expr:
arith_expr
bool_expr
'lambda' func_def
'if' '(' bool_expr ')' ':' scope ('else' ':' scope)? 'end'
var
arith_expr
: INT
| -arith_expr
| arith_expr + arith_expr
| arith_expr - arith_expr
| arith_expr / arith_expr
| arith_expr * arith_expr
| arith_expr % arith_expr
;
bool_expr
: true
| false
| !bool_expr
| bool_expr 'and' bool_expr
| bool_expr 'or' bool_expr
| arith_expr '<' arith_expr
| expr '==' expr
| expr '!=' expr
;
assignment_stmt
: 'let' varname '=' expr '\n'
| 'func' varname func_def '\n'
;
func_def
: '(' param* ')' ':' scope 'end'
;
scope:
| assignment_stmt* expr
;
More language features will be added in the future.
Currently, there is only an interpreter written in Python which uses the SLY lexer and parser library. In the future, the interpreter will be converted into C/C++ for speed and better portability.
To begin, run interpreter.py using python3 to open the Asobu language terminal.
Currently, the terminal only accepts one line expressions.
To exit the terminal type quit into the prompt.
To run a file (which can be more than one line long) specify the text you are entering is a pathname by first using the
$f flag. Hence, your command should look similar to this:
gai (> $f ./sample/file/path/example.ga
To run an Asobu file, also ensure that it has a .ga extension or the terminal will not recognize it as a valid file.