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basic: yet more parser wip

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minjaesong
2020-12-11 11:41:18 +09:00
parent 401bb47481
commit 833a8df07b
3 changed files with 274 additions and 106 deletions
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28
assets/basic.js
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@@ -1607,31 +1607,32 @@ linenumber = digits ;
stmt =
"IF" , if_equation , "THEN" , stmt , ["ELSE" , stmt]
| "DEFUN" , [lit] , "(" , [lit , {" , " , lit}] , ")" , "=" , stmt
| "ON" , lit , lit , equation , {"," , equation}
| function_call
| "(" , stmt , ")" ;
| "DEFUN" , [ident] , "(" , [ident , {" , " , ident}] , ")" , "=" , stmt
| "ON" , ident , ident , equation , {"," , equation}
| "(" , stmt , ")"
| function_call ;
function_call =
lit
| lit , function_call , {argsep , function_call}
| lit , "(" , [function_call , {argsep , function_call}] , ")"
| equation
equation
| ident , "(" , [function_call , {argsep , function_call} , [argsep]] , ")"
| ident , function_call , {argsep , function_call} , [argsep] ;
equation = equation , op , equation
| op_uni , equation
| lit
equation =
lit
| "(" , equation , ")"
| equation , op , equation
| op_uni , equation ;
if_equation = if_equation , op - ("=") , if_equation
| op_uni , if_equation
| lit
| "(" , if_equation , ")"
| "(" , if_equation , ")" ;
(* don't bother looking at these, because you already know the stuff *)
(* 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" *)
op = "^" | "*" | "/" | "MOD" | "+" | "-" | "<<" | ">>" | "<" | ">" | "<="
| "=<" | ">=" | "=>" | "==" | "<>" | "><" | "BAND" | "BXOR" | "BOR"
@@ -1663,7 +1664,6 @@ hexdigit = "A" | "B" | "C" | "D" | "E" | "F" | "a" | "b"
bindigit = "0" | "1" ;
(* all possible token states: lit num op bool qot paren sep *)
*/
// @return BasicAST
bF._parseEquation = functoin(lnum, tokens, states, recDepth) {