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basic: it seems parser is working again :D

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minjaesong
2020-12-12 11:40:08 +09:00
parent 55c971fcf8
commit 19f323b90e
2 changed files with 437 additions and 279 deletions
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46
assets/tbas/syntax.txt
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@@ -1,37 +1,37 @@
(* quick reference to EBNF *)
(* { word } = word is repeated 0 or more times *)
(* [ word ] = word is optional (repeated 0 or 1 times) *)
line = linenumber , stmt , {":" , stmt} ;
linenumber = digits ;
stmt =
"IF" , if_conditional , "THEN" , stmt , ["ELSE" , stmt] ; //TODO
| "DEFUN" , [ident] , "(" , [ident , {" , " , ident}] , ")" , "=" , expr //TODO
| "ON" , if_conditional , ident , if_conditional , {"," , if_conditional}
"IF" , expr_sans_asgn , "THEN" , stmt , ["ELSE" , stmt]
| "DEFUN" , [ident] , "(" , [ident , {" , " , ident}] , ")" , "=" , expr
| "ON" , expr_sans_asgn , ("GOTO" | "GOSUB") , expr_sans_asgn , {"," , expr_sans_asgn}
| "(" , stmt , ")"
| expr ;
expr = // ALL TODO
"(" , expr , ")"
| function_call , op , function_call
| op_uni , function_call
| function_call ; //TODO
expr = (* this basically blocks some funny attemps such as using DEFUN as anon function because everything is global in BASIC *)
lit
| "(" , expr , ")"
| "IF" , expr_sans_asgn , "THEN" , expr , ["ELSE" , expr]
| expr , op , expr
| op_uni , expr
| function_call ;
function_call = // ALL TODO
"IF" , if_conditional , "THEN" , expr , ["ELSE" , expr] ; //TODO
| lit
| ident , "(" , [expr , {argsep , expr} , [argsep]] , ")"
expr_sans_asgn = ? identical to expr except errors out whenever "=" is found ? ;
function_call =
ident , "(" , [expr , {argsep , expr} , [argsep]] , ")"
| ident , expr , {argsep , expr} , [argsep] ;
if_conditional =
"(" , if_conditional , ")"
| function_call , op - "=" , function_call
| op_uni , function_call
| function_call ; //TODO
(* don't bother looking at these, because you already know the stuff *)
function = lit ;
argsep = ","|";" ;
ident = alph , [digits] ;
lit = alph , [digits] | num | string ; (* example: "MyVar_2" *)
argsep = "," | ";" ;
ident = alph , [digits] ; (* variable and function names *)
lit = alph , [digits] | num | string ; (* ident + numbers and string literals *)
op = "^" | "*" | "/" | "MOD" | "+" | "-" | "<<" | ">>" | "<" | ">" | "<="
| "=<" | ">=" | "=>" | "==" | "<>" | "><" | "BAND" | "BXOR" | "BOR"
| "AND" | "OR" | "TO" | "STEP" | "!" | "~" | "#" | "=" ;
@@ -76,8 +76,8 @@ DEFUN (type: function, value: DEFUN)
2. stmt
ON (type: function, value: ON)
1. varname
2. functionname
1. testvalue
2. functionname (type: lit)
3. arg0
[4. arg1]
[5. argN...]