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basic: making sure 'PRINT -3' to work

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minjaesong
2020-12-14 11:01:16 +09:00
parent 1b6f768f9d
commit f1365ed34c
3 changed files with 85 additions and 64 deletions
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4
assets/tbas/syntax.txt
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@@ -7,7 +7,6 @@ linenumber = digits ;
stmt =
"IF" , expr_sans_asgn , "THEN" , stmt , ["ELSE" , stmt]
| "FOR" , expr
| "DEFUN" , [ident] , "(" , [ident , {" , " , ident}] , ")" , "=" , expr
| "ON" , expr_sans_asgn , ("GOTO" | "GOSUB") , expr_sans_asgn , {"," , expr_sans_asgn}
| "(" , stmt , ")"
@@ -17,6 +16,7 @@ expr = (* this basically blocks some funny attemps such as using DEFUN as anon f
lit
| "(" , expr , ")"
| "IF" , expr_sans_asgn , "THEN" , expr , ["ELSE" , expr]
| kywd , expr - "(" (* also deals with FOR statement *)
(* at this point, if OP is found in paren-level 0, skip function_call *)
| function_call
| expr , op , expr
@@ -27,7 +27,7 @@ expr_sans_asgn = ? identical to expr except errors out whenever "=" is found ? ;
function_call =
ident , "(" , [expr , {argsep , expr} , [argsep]] , ")"
| ident , expr , {argsep , expr} , [argsep] ;
kywd = ? words that exists on the list of predefined function that are not operators ? ;
(* don't bother looking at these, because you already know the stuff *)