junkbasic
Trying for a small self-hosted BASIC native code compiler for the P2.
Editor Commands
NEW
NEW filename
LOAD
LOAD filename
SAVE
SAVE filename
LIST
RUN
RENUM
Language syntax
Comments
REM comment
Function Definitions
FUNCTION function-name
FUNCTION function-name ( arg [ , arg ]... )
END FUNCTION
Subroutine Defintions
SUB subroutine-name
SUB subroutine-name ( arg [ , arg ]... )
END SUB
Variable Declarations
dim-statement:
DIM variable-def [ , variable-def ]...
variable-def:
var [ scalar-initializer ]
var '[' size ']' [ array-initializer ]
scalar-initializer:
= constant-expr
array-initializer:
= { constant-expr [ , constant-expr ]... }
Assignment Statements
[LET] var = expr
Control Statements
RETURN expr
IF expr
ELSE IF expr
ELSE
END IF
END
FOR var = start TO end [ STEP inc ]
NEXT var
DO
DO WHILE expr
DO UNTIL expr
LOOP
LOOP WHILE expr
LOOP UNTIL expr
label:
GOTO label
Output Statements
PRINT expr [ ;|, expr ]... [ ; ]
Expressions
expr AND expr
expr OR expr
expr ^ expr
expr | expr
expr & expr
expr = expr
expr <> expr
expr < expr
expr <= expr
expr >= expr
expr > expr
expr << expr
expr >> expr
expr + expr
expr - expr
expr * expr
expr / expr
expr MOD expr
- expr
~ expr
NOT expr
function ( arg [, arg ]... )
array [ index ]
(expr)
var
integer
"string"
Built-in Variables
clkfreq
par
cnt
ina
inb
outa
outb
dira
dirb
ctra
ctrb
frqa
frqb
phsa
phsb
vcfg
vscl
Built-in Functions
waitcnt(target)
waitpeq(state, mask)
waitpne(state, mask)