An updated version of the code, for testing purposes as I expand it:
REDIM SHARED OName(0) AS STRING 'Operation Name
REDIM SHARED PL(0) AS INTEGER 'Priority Level
DIM SHARED QuickReturn AS INTEGER
Set_OrderOfOperations
DO
i$ = INPUT$(1)
CLS
SELECT CASE i$
CASE CHR$(8)
eval$ = LEFT$(eval$, LEN(eval$) - 1)
CASE CHR$(13)
eval$ = ""
CASE CHR$(27)
SYSTEM
CASE ELSE
eval$ = eval$ + i$
END SELECT
PRINT eval$
PRINT Evaluate_Expression(eval$)
LOOP
'Steve Subs/Functins for _MATH support with CONST
FUNCTION Evaluate_Expression$ (e$)
t$ = e$ 'So we preserve our original data, we parse a temp copy of it
b = INSTR(UCASE$(e$), "EQL") 'take out assignment before the preparser sees it
IF b THEN t$ = MID$(e$, b + 3): var$ = UCASE$(LTRIM$(RTRIM$(MID$(e$, 1, b - 1))))
QuickReturn = 0
PreParse t$
IF QuickReturn THEN Evaluate_Expression$ = t$: EXIT FUNCTION
IF LEFT$(t$, 5) = "ERROR" THEN Evaluate_Expression$ = t$: EXIT FUNCTION
'Deal with brackets first
exp$ = "(" + t$ + ")" 'Starting and finishing brackets for our parse routine.
DO
Eval_E = INSTR(exp$, ")")
IF Eval_E > 0 THEN
c = 0
DO UNTIL Eval_E - c <= 0
c = c + 1
IF Eval_E THEN
IF MID$(exp$, Eval_E - c, 1) = "(" THEN EXIT DO
END IF
LOOP
s = Eval_E - c + 1
IF s < 1 THEN Evaluate_Expression$ = "ERROR -- BAD () Count": EXIT SUB
eval$ = " " + MID$(exp$, s, Eval_E - s) + " " 'pad with a space before and after so the parser can pick up the values properly.
ParseExpression eval$
eval$ = LTRIM$(RTRIM$(eval$))
IF LEFT$(eval$, 5) = "ERROR" THEN Evaluate_Expression$ = eval$: EXIT SUB
exp$ = DWD(LEFT$(exp$, s - 2) + eval$ + MID$(exp$, Eval_E + 1))
IF MID$(exp$, 1, 1) = "N" THEN MID$(exp$, 1) = "-"
temppp$ = DWD(LEFT$(exp$, s - 2) + " ## " + eval$ + " ## " + MID$(exp$, E + 1))
END IF
LOOP UNTIL Eval_E = 0
c = 0
DO
c = c + 1
SELECT CASE MID$(exp$, c, 1)
CASE "0" TO "9", ".", "-" 'At this point, we should only have number values left.
CASE ELSE: Evaluate_Expression$ = "ERROR - Unknown Diagnosis: (" + exp$ + ") ": EXIT SUB
END SELECT
LOOP UNTIL c >= LEN(exp$)
Evaluate_Expression$ = exp$
END FUNCTION
SUB ParseExpression (exp$)
DIM num(10) AS STRING
'PRINT exp$
'We should now have an expression with no () to deal with
IF MID$(exp$, 2, 1) = "-" THEN exp$ = "0+" + MID$(exp$, 2)
FOR J = 1 TO 250
lowest = 0
DO UNTIL lowest = LEN(exp$)
lowest = LEN(exp$): OpOn = 0
FOR P = 1 TO UBOUND(OName)
'Look for first valid operator
IF J = PL(P) THEN 'Priority levels match
IF LEFT$(exp$, 1) = "-" THEN op = INSTR(2, exp$, OName(P)) ELSE op = INSTR(exp$, OName(P))
IF op > 0 AND op < lowest THEN lowest = op: OpOn = P
END IF
NEXT
IF OpOn = 0 THEN EXIT DO 'We haven't gotten to the proper PL for this OP to be processed yet.
IF LEFT$(exp$, 1) = "-" THEN op = INSTR(2, exp$, OName(OpOn)) ELSE op = INSTR(exp$, OName(OpOn))
numset = 0
'*** SPECIAL OPERATION RULESETS
IF OName(OpOn) = "-" THEN 'check for BOOLEAN operators before the -
SELECT CASE MID$(exp$, op - 3, 3)
CASE "NOT", "XOR", "AND", "EQV", "IMP"
EXIT DO 'Not an operator, it's a negative
END SELECT
IF MID$(exp$, op - 3, 2) = "OR" THEN EXIT DO 'Not an operator, it's a negative
END IF
IF op THEN
c = LEN(OName(OpOn)) - 1
DO
SELECT CASE MID$(exp$, op + c + 1, 1)
CASE "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", ".", "N": numset = -1 'Valid digit
CASE "-" 'We need to check if it's a minus or a negative
IF OName(OpOn) = "_PI" OR numset THEN EXIT DO
CASE ",": numset = 0
CASE ELSE 'Not a valid digit, we found our separator
EXIT DO
END SELECT
c = c + 1
LOOP UNTIL op + c >= LEN(exp$)
E = op + c
c = 0
DO
c = c + 1
SELECT CASE MID$(exp$, op - c, 1)
CASE "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", ".", "N" 'Valid digit
CASE "-" 'We need to check if it's a minus or a negative
c1 = c
bad = 0
DO
c1 = c1 + 1
SELECT CASE MID$(exp$, op - c1, 1)
CASE "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "."
bad = -1
EXIT DO 'It's a minus sign
CASE ELSE
'It's a negative sign and needs to count as part of our numbers
END SELECT
LOOP UNTIL op - c1 <= 0
IF bad THEN EXIT DO 'We found our seperator
CASE ELSE 'Not a valid digit, we found our separator
EXIT DO
END SELECT
LOOP UNTIL op - c <= 0
s = op - c
num(1) = MID$(exp$, s + 1, op - s - 1) 'Get our first number
num(2) = MID$(exp$, op + LEN(OName(OpOn)), E - op - LEN(OName(OpOn)) + 1) 'Get our second number
IF MID$(num(1), 1, 1) = "N" THEN MID$(num(1), 1) = "-"
IF MID$(num(2), 1, 1) = "N" THEN MID$(num(2), 1) = "-"
num(3) = EvaluateNumbers(OpOn, num())
IF MID$(num(3), 1, 1) = "-" THEN MID$(num(3), 1) = "N"
'PRINT "*************"
'PRINT num(1), OName(OpOn), num(2), num(3), exp$
IF LEFT$(num(3), 5) = "ERROR" THEN exp$ = num(3): EXIT SUB
exp$ = LTRIM$(N2S(DWD(LEFT$(exp$, s) + RTRIM$(LTRIM$(num(3))) + MID$(exp$, E + 1))))
'PRINT exp$
END IF
op = 0
LOOP
NEXT
END SUB
SUB Set_OrderOfOperations
'PL sets our priortity level. 1 is highest to 65535 for the lowest.
'I used a range here so I could add in new priority levels as needed.
'OName ended up becoming the name of our commands, as I modified things.... Go figure! LOL!
'Constants get evaluated first, with a Priority Level of 1
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "_PI"
REDIM _PRESERVE PL(i): PL(i) = 1
'I'm not certain where exactly percentages should go. They kind of seem like a special case to me. COS10% should be COS.1 I'd think...
'I'm putting it here for now, and if anyone knows someplace better for it in our order of operations, let me know.
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "%"
REDIM _PRESERVE PL(i): PL(i) = 5
'Then Functions with PL 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "_ACOS"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "_ASIN"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "_ARCSEC"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "_ARCCSC"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "_ARCCOT"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "_SECH"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "_CSCH"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "_COTH"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "COS"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "SIN"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "TAN"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "LOG"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "EXP"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "ATN"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "_D2R"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "_D2G"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "_R2D"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "_R2G"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "_G2D"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "_G2R"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "ABS"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "SGN"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "INT"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "_ROUND"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "FIX"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "_SEC"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "_CSC"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "_COT"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "ASC"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "CHR$"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "_RGB32"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "_RGBA32"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "_RGB"
REDIM _PRESERVE PL(i): PL(i) = 10
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "_RGBA"
REDIM _PRESERVE PL(i): PL(i) = 10
'Exponents with PL 20
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "^"
REDIM _PRESERVE PL(i): PL(i) = 20
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "SQR"
REDIM _PRESERVE PL(i): PL(i) = 20
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "ROOT"
REDIM _PRESERVE PL(i): PL(i) = 20
'Multiplication and Division PL 30
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "*"
REDIM _PRESERVE PL(i): PL(i) = 30
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "/"
REDIM _PRESERVE PL(i): PL(i) = 30
'Integer Division PL 40
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "\"
REDIM _PRESERVE PL(i): PL(i) = 40
'MOD PL 50
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "MOD"
REDIM _PRESERVE PL(i): PL(i) = 50
'Addition and Subtraction PL 60
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "+"
REDIM _PRESERVE PL(i): PL(i) = 60
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "-"
REDIM _PRESERVE PL(i): PL(i) = 60
'Relational Operators =, >, <, <>, <=, >= PL 70
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "<>"
REDIM _PRESERVE PL(i): PL(i) = 70
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "><" 'These next three are just reversed symbols as an attempt to help process a common typo
REDIM _PRESERVE PL(i): PL(i) = 70
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "<="
REDIM _PRESERVE PL(i): PL(i) = 70
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = ">="
REDIM _PRESERVE PL(i): PL(i) = 70
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "=<" 'I personally can never keep these things straight. Is it < = or = <...
REDIM _PRESERVE PL(i): PL(i) = 70
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "=>" 'Who knows, check both!
REDIM _PRESERVE PL(i): PL(i) = 70
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = ">"
REDIM _PRESERVE PL(i): PL(i) = 70
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "<"
REDIM _PRESERVE PL(i): PL(i) = 70
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "="
REDIM _PRESERVE PL(i): PL(i) = 70
'Logical Operations PL 80+
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "NOT"
REDIM _PRESERVE PL(i): PL(i) = 80
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "AND"
REDIM _PRESERVE PL(i): PL(i) = 90
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "OR"
REDIM _PRESERVE PL(i): PL(i) = 100
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "XOR"
REDIM _PRESERVE PL(i): PL(i) = 110
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "EQV"
REDIM _PRESERVE PL(i): PL(i) = 120
i = i + 1: REDIM _PRESERVE OName(i): OName(i) = "IMP"
REDIM _PRESERVE PL(i): PL(i) = 130
END SUB
FUNCTION EvaluateNumbers$ (p, num() AS STRING)
DIM n1 AS _FLOAT, n2 AS _FLOAT, n3 AS _FLOAT
IF INSTR(num(1), ",") THEN EvaluateNumbers$ = "ERROR - Invalid comma (" + num(1) + ")": EXIT FUNCTION
IF INSTR(num(2), ",") THEN
SELECT CASE OName(p) 'only certain commands should pass a comma value
CASE "_RGB32", "_RGBA32", "_RGB", "_RGBA"
CASE ELSE
EvaluateNumbers$ = "ERROR - Invalid comma (" + num(2) + ")": EXIT FUNCTION
END SELECT
END IF
SELECT CASE OName(p) 'Depending on our operator..
CASE "_PI": n1 = 3.14159265358979323846264338327950288## 'Future compatable in case something ever stores extra digits for PI
CASE "%": n1 = (VAL(num(1))) / 100 'Note percent is a special case and works with the number BEFORE the % command and not after
CASE "_ACOS": n1 = _ACOS(VAL(num(2)))
CASE "_ASIN": n1 = _ASIN(VAL(num(2)))
CASE "_ARCSEC": n1 = _ARCSEC(VAL(num(2)))
CASE "_ARCCSC": n1 = _ARCCSC(VAL(num(2)))
CASE "_ARCCOT": n1 = _ARCCOT(VAL(num(2)))
CASE "_SECH": n1 = _SECH(VAL(num(2)))
CASE "_CSCH": n1 = _CSCH(VAL(num(2)))
CASE "_COTH": n1 = _COTH(VAL(num(2)))
CASE "_RGB32"
n$ = num(2)
IF n$ = "" THEN EvaluateNumbers$ = "ERROR - Invalid null _RGB32": EXIT FUNCTION
c1 = INSTR(n$, ",")
IF c1 THEN c2 = INSTR(c1 + 1, n$, ",")
IF c2 THEN c3 = INSTR(c2 + 1, n$, ",")
IF c3 THEN c4 = INSTR(c2 + 1, n$, ",")
IF c1 = 0 THEN 'there's no comma in the command to parse. It's a grayscale value
n = VAL(num(2))
n1 = _RGB32(n, n, n)
ELSEIF c2 = 0 THEN 'there's one comma and not 2. It's grayscale with alpha.
n = VAL(LEFT$(num(2), c1))
n2 = VAL(MID$(num(2), c1 + 1))
n1 = _RGBA32(n, n, n, n2)
ELSEIF c3 = 0 THEN 'there's two commas. It's _RGB values
n = VAL(LEFT$(num(2), c1))
n2 = VAL(MID$(num(2), c1 + 1))
n3 = VAL(MID$(num(2), c2 + 1))
n1 = _RGB32(n, n2, n3)
ELSEIF c4 = 0 THEN 'there's three commas. It's _RGBA values
n = VAL(LEFT$(num(2), c1))
n2 = VAL(MID$(num(2), c1 + 1))
n3 = VAL(MID$(num(2), c2 + 1))
n4 = VAL(MID$(num(2), c3 + 1))
n1 = _RGBA32(n, n2, n3, n4)
ELSE 'we have more than three commas. I have no idea WTH type of values got passed here!
EvaluateNumbers$ = "ERROR - Invalid comma count (" + num(2) + ")": EXIT FUNCTION
END IF
CASE "_RGBA32"
n$ = num(2)
IF n$ = "" THEN EvaluateNumbers$ = "ERROR - Invalid null _RGBA32": EXIT FUNCTION
c1 = INSTR(n$, ",")
IF c1 THEN c2 = INSTR(c1 + 1, n$, ",")
IF c2 THEN c3 = INSTR(c2 + 1, n$, ",")
IF c3 THEN c4 = INSTR(c3 + 1, n$, ",")
IF c3 = 0 OR c4 <> 0 THEN EvaluateNumbers$ = "ERROR - Invalid comma count (" + num(2) + ")": EXIT FUNCTION
'we have to have 3 commas; not more, not less.
n = VAL(LEFT$(num(2), c1))
n2 = VAL(MID$(num(2), c1 + 1))
n3 = VAL(MID$(num(2), c2 + 1))
n4 = VAL(MID$(num(2), c3 + 1))
n1 = _RGBA32(n, n2, n3, n4)
CASE "_RGB"
n$ = num(2)
IF n$ = "" THEN EvaluateNumbers$ = "ERROR - Invalid null _RGB": EXIT FUNCTION
c1 = INSTR(n$, ",")
IF c1 THEN c2 = INSTR(c1 + 1, n$, ",")
IF c2 THEN c3 = INSTR(c2 + 1, n$, ",")
IF c3 THEN c4 = INSTR(c3 + 1, n$, ",")
IF c3 = 0 OR c4 <> 0 THEN EvaluateNumbers$ = "ERROR - Invalid comma count (" + num(2) + "). _RGB requires 4 parameters for Red, Green, Blue, ScreenMode.": EXIT FUNCTION
'we have to have 3 commas; not more, not less.
n = VAL(LEFT$(num(2), c1))
n2 = VAL(MID$(num(2), c1 + 1))
n3 = VAL(MID$(num(2), c2 + 1))
n4 = VAL(MID$(num(2), c3 + 1))
SELECT CASE n4
CASE 0 TO 2, 7 TO 13, 256, 32 'these are the good screen values
CASE ELSE
EvaluateNumbers$ = "ERROR - Invalid Screen Mode (" + STR$(n4) + ")": EXIT FUNCTION
END SELECT
t = _NEWIMAGE(1, 1, n4)
n1 = _RGB(n, n2, n3, t)
_FREEIMAGE t
CASE "_RGBA"
n$ = num(2)
IF n$ = "" THEN EvaluateNumbers$ = "ERROR - Invalid null _RGBA": EXIT FUNCTION
c1 = INSTR(n$, ",")
IF c1 THEN c2 = INSTR(c1 + 1, n$, ",")
IF c2 THEN c3 = INSTR(c2 + 1, n$, ",")
IF c3 THEN c4 = INSTR(c3 + 1, n$, ",")
IF c4 THEN c5 = INSTR(c4 + 1, n$, ",")
IF c4 = 0 OR c5 <> 0 THEN EvaluateNumbers$ = "ERROR - Invalid comma count (" + num(2) + "). _RGBA requires 5 parameters for Red, Green, Blue, Alpha, ScreenMode.": EXIT FUNCTION
'we have to have 4 commas; not more, not less.
n = VAL(LEFT$(num(2), c1))
n2 = VAL(MID$(num(2), c1 + 1))
n3 = VAL(MID$(num(2), c2 + 1))
n4 = VAL(MID$(num(2), c3 + 1))
n5 = VAL(MID$(num(2), c4 + 1))
SELECT CASE n5
CASE 0 TO 2, 7 TO 13, 256, 32 'these are the good screen values
CASE ELSE
EvaluateNumbers$ = "ERROR - Invalid Screen Mode (" + STR$(n5) + ")": EXIT FUNCTION
END SELECT
t = _NEWIMAGE(1, 1, n5)
n1 = _RGBA(n, n2, n3, n4, t)
_FREEIMAGE t
CASE "COS": n1 = COS(VAL(num(2)))
CASE "SIN": n1 = SIN(VAL(num(2)))
CASE "TAN": n1 = TAN(VAL(num(2)))
CASE "LOG": n1 = LOG(VAL(num(2)))
CASE "EXP": n1 = EXP(VAL(num(2)))
CASE "ATN": n1 = ATN(VAL(num(2)))
CASE "_D2R": n1 = 0.0174532925 * (VAL(num(2)))
CASE "_D2G": n1 = 1.1111111111 * (VAL(num(2)))
CASE "_R2D": n1 = 57.2957795 * (VAL(num(2)))
CASE "_R2G": n1 = 0.015707963 * (VAL(num(2)))
CASE "_G2D": n1 = 0.9 * (VAL(num(2)))
CASE "_G2R": n1 = 63.661977237 * (VAL(num(2)))
CASE "ABS": n1 = ABS(VAL(num(2)))
CASE "SGN": n1 = SGN(VAL(num(2)))
CASE "INT": n1 = INT(VAL(num(2)))
CASE "_ROUND": n1 = _ROUND(VAL(num(2)))
CASE "FIX": n1 = FIX(VAL(num(2)))
CASE "_SEC": n1 = _SEC(VAL(num(2)))
CASE "_CSC": n1 = _CSC(VAL(num(2)))
CASE "_COT": n1 = _COT(VAL(num(2)))
CASE "^": n1 = VAL(num(1)) ^ VAL(num(2))
CASE "SQR": n1 = SQR(VAL(num(2)))
CASE "ROOT"
n1 = VAL(num(1)): n2 = VAL(num(2))
IF n2 = 1 THEN EvaluateNumbers$ = RTRIM$(LTRIM$(STR$(n1))): EXIT FUNCTION
IF n1 < 0 AND n2 >= 1 THEN sign = -1: n1 = -n1 ELSE sign = 1
n3 = 1## / n2
IF n3 <> INT(n3) AND n2 < 1 THEN sign = SGN(n1): n1 = ABS(n1)
n1 = sign * (n1 ^ n3)
CASE "*": n1 = VAL(num(1)) * VAL(num(2))
CASE "/": n1 = VAL(num(1)) / VAL(num(2))
CASE "\"
IF VAL(num(2)) <> 0 THEN
n1 = VAL(num(1)) \ VAL(num(2))
ELSE
EvaluateNumbers$ = "ERROR - Bad operation (We shouldn't see this)"
EXIT FUNCTION
END IF
CASE "MOD": n1 = VAL(num(1)) MOD VAL(num(2))
CASE "+": n1 = VAL(num(1)) + VAL(num(2))
CASE "-": n1 = VAL(num(1)) - VAL(num(2))
CASE "=": n1 = VAL(num(1)) = VAL(num(2))
CASE ">": n1 = VAL(num(1)) > VAL(num(2))
CASE "<": n1 = VAL(num(1)) < VAL(num(2))
CASE "<>", "><": n1 = VAL(num(1)) <> VAL(num(2))
CASE "<=", "=<": n1 = VAL(num(1)) <= VAL(num(2))
CASE ">=", "=>": n1 = VAL(num(1)) >= VAL(num(2))
CASE "NOT": n1 = NOT VAL(num(2))
CASE "AND": n1 = VAL(num(1)) AND VAL(num(2))
CASE "OR": n1 = VAL(num(1)) OR VAL(num(2))
CASE "XOR": n1 = VAL(num(1)) XOR VAL(num(2))
CASE "EQV": n1 = VAL(num(1)) EQV VAL(num(2))
CASE "IMP": n1 = VAL(num(1)) IMP VAL(num(2))
CASE ELSE
EvaluateNumbers$ = "ERROR - Bad operation (We shouldn't see this)" 'Let's say we're bad...
END SELECT
EvaluateNumbers$ = RTRIM$(LTRIM$(STR$(n1)))
END FUNCTION
FUNCTION DWD$ (exp$) 'Deal With Duplicates
'To deal with duplicate operators in our code.
'Such as -- becomes a +
'++ becomes a +
'+- becomes a -
'-+ becomes a -
t$ = exp$
DO
bad = 0
DO
l = INSTR(t$, "++")
IF l THEN t$ = LEFT$(t$, l - 1) + "+" + MID$(t$, l + 2): bad = -1
LOOP UNTIL l = 0
DO
l = INSTR(t$, "+-")
IF l THEN t$ = LEFT$(t$, l - 1) + "-" + MID$(t$, l + 2): bad = -1
LOOP UNTIL l = 0
DO
l = INSTR(t$, "-+")
IF l THEN t$ = LEFT$(t$, l - 1) + "-" + MID$(t$, l + 2): bad = -1
LOOP UNTIL l = 0
DO
l = INSTR(t$, "--")
IF l THEN t$ = LEFT$(t$, l - 1) + "+" + MID$(t$, l + 2): bad = -1
LOOP UNTIL l = 0
LOOP UNTIL NOT bad
DWD$ = t$
VerifyString t$
END FUNCTION
SUB PreParse (e$)
DIM f AS _FLOAT
t$ = e$
'First strip all spaces
t$ = ""
FOR i = 1 TO LEN(e$)
IF MID$(e$, i, 1) <> " " THEN t$ = t$ + MID$(e$, i, 1)
NEXT
t$ = UCASE$(t$)
IF t$ = "" THEN e$ = "ERROR -- NULL string; nothing to evaluate": EXIT SUB
'ERROR CHECK by counting our brackets
l = 0
DO
l = INSTR(l + 1, t$, "("): IF l THEN c = c + 1
LOOP UNTIL l = 0
l = 0
DO
l = INSTR(l + 1, t$, ")"): IF l THEN c1 = c1 + 1
LOOP UNTIL l = 0
IF c <> c1 THEN e$ = "ERROR -- Bad Parenthesis:" + STR$(c) + "( vs" + STR$(c1) + ")": EXIT SUB
'Modify so that NOT will process properly
l = 0
DO
l = INSTR(l + 1, t$, "NOT")
IF l THEN
'We need to work magic on the statement so it looks pretty.
' 1 + NOT 2 + 1 is actually processed as 1 + (NOT 2 + 1)
'Look for something not proper
l1 = INSTR(l + 1, t$, "AND")
IF l1 = 0 OR (INSTR(l + 1, t$, "OR") > 0 AND INSTR(l + 1, t$, "OR") < l1) THEN l1 = INSTR(l + 1, t$, "OR")
IF l1 = 0 OR (INSTR(l + 1, t$, "XOR") > 0 AND INSTR(l + 1, t$, "XOR") < l1) THEN l1 = INSTR(l + 1, t$, "XOR")
IF l1 = 0 OR (INSTR(l + 1, t$, "EQV") > 0 AND INSTR(l + 1, t$, "EQV") < l1) THEN l1 = INSTR(l + 1, t$, "EQV")
IF l1 = 0 OR (INSTR(l + 1, t$, "IMP") > 0 AND INSTR(l + 1, t$, "IMP") < l1) THEN l1 = INSTR(l + 1, t$, "IMP")
IF l1 = 0 THEN l1 = LEN(t$) + 1
t$ = LEFT$(t$, l - 1) + "(" + MID$(t$, l, l1 - l) + ")" + MID$(t$, l + l1 - l)
l = l + 3
'PRINT t$
END IF
LOOP UNTIL l = 0
'Check for bad operators before a ( bracket
l = 0
DO
l = INSTR(l + 1, t$, "(")
IF l AND l > 2 THEN 'Don't check the starting bracket; there's nothing before it.
good = 0
FOR i = 1 TO UBOUND(OName)
IF MID$(t$, l - LEN(OName(i)), LEN(OName(i))) = OName(i) AND PL(i) > 1 AND PL(i) <= 250 THEN good = -1: EXIT FOR 'We found an operator after our ), and it's not a CONST (like PI)
NEXT
IF NOT good THEN e$ = "ERROR - Improper operations before (.": EXIT SUB
l = l + 1
END IF
LOOP UNTIL l = 0
'Check for bad operators after a ) bracket
l = 0
DO
l = INSTR(l + 1, t$, ")")
IF l AND l < LEN(t$) THEN
good = 0
FOR i = 1 TO UBOUND(OName)
IF MID$(t$, l + 1, LEN(OName(i))) = OName(i) AND PL(i) > 1 AND PL(i) <= 250 THEN good = -1: EXIT FOR 'We found an operator after our ), and it's not a CONST (like PI)
NEXT
IF MID$(t$, l + 1, 1) = ")" THEN good = -1
IF NOT good THEN e$ = "ERROR - Improper operations after ).": EXIT SUB
l = l + 1
END IF
LOOP UNTIL l = 0 OR l = LEN(t$) 'last symbol is a bracket
'Turn all &H (hex) numbers into decimal values for the program to process properly
l = 0
DO
l = INSTR(t$, "&H")
IF l THEN
E = l + 1: finished = 0
DO
E = E + 1
comp$ = MID$(t$, E, 1)
SELECT CASE comp$
CASE "0" TO "9", "A" TO "F" 'All is good, our next digit is a number, continue to add to the hex$
CASE ELSE
good = 0
FOR i = 1 TO UBOUND(OName)
IF MID$(t$, E, LEN(OName(i))) = OName(i) AND PL(i) > 1 AND PL(i) <= 250 THEN good = -1: EXIT FOR 'We found an operator after our ), and it's not a CONST (like PI)
NEXT
IF NOT good THEN e$ = "ERROR - Improper &H value. (" + comp$ + ")": EXIT SUB
E = E - 1
finished = -1
END SELECT
LOOP UNTIL finished OR E = LEN(t$)
t$ = LEFT$(t$, l - 1) + LTRIM$(RTRIM$(STR$(VAL(MID$(t$, l, E - l + 1))))) + MID$(t$, E + 1)
END IF
LOOP UNTIL l = 0
'Turn all &B (binary) numbers into decimal values for the program to process properly
l = 0
DO
l = INSTR(t$, "&B")
IF l THEN
E = l + 1: finished = 0
DO
E = E + 1
comp$ = MID$(t$, E, 1)
SELECT CASE comp$
CASE "0", "1" 'All is good, our next digit is a number, continue to add to the hex$
CASE ELSE
good = 0
FOR i = 1 TO UBOUND(OName)
IF MID$(t$, E, LEN(OName(i))) = OName(i) AND PL(i) > 1 AND PL(i) <= 250 THEN good = -1: EXIT FOR 'We found an operator after our ), and it's not a CONST (like PI)
NEXT
IF NOT good THEN e$ = "ERROR - Improper &B value. (" + comp$ + ")": EXIT SUB
E = E - 1
finished = -1
END SELECT
LOOP UNTIL finished OR E = LEN(t$)
bin$ = MID$(t$, l + 2, E - l - 1)
FOR i = 1 TO LEN(bin$)
IF MID$(bin$, i, 1) = "1" THEN f = f + 2 ^ (LEN(bin$) - i)
NEXT
t$ = LEFT$(t$, l - 1) + LTRIM$(RTRIM$(STR$(f))) + MID$(t$, E + 1)
END IF
LOOP UNTIL l = 0
t$ = N2S(t$)
VerifyString t$
e$ = t$
END SUB
SUB VerifyString (t$)
'ERROR CHECK for unrecognized operations
j = 1
DO
comp$ = MID$(t$, j, 1)
SELECT CASE comp$
CASE "0" TO "9", ".", "(", ")", ",": j = j + 1
CASE ELSE
good = 0
FOR i = 1 TO UBOUND(OName)
IF MID$(t$, j, LEN(OName(i))) = OName(i) THEN good = -1: EXIT FOR 'We found an operator after our ), and it's not a CONST (like PI)
NEXT
IF NOT good THEN t$ = "ERROR - Bad Operational value. (" + comp$ + ")": EXIT SUB
j = j + LEN(OName(i))
END SELECT
LOOP UNTIL j > LEN(t$)
END SUB
FUNCTION N2S$ (exp$) 'scientific Notation to String
t$ = LTRIM$(RTRIM$(exp$))
IF LEFT$(t$, 1) = "-" THEN sign$ = "-": t$ = MID$(t$, 2)
dp = INSTR(t$, "D+"): dm = INSTR(t$, "D-")
ep = INSTR(t$, "E+"): em = INSTR(t$, "E-")
check1 = SGN(dp) + SGN(dm) + SGN(ep) + SGN(em)
IF check1 < 1 OR check1 > 1 THEN N2S = exp$: EXIT SUB 'If no scientic notation is found, or if we find more than 1 type, it's not SN!
SELECT CASE l 'l now tells us where the SN starts at.
CASE IS < dp: l = dp
CASE IS < dm: l = dm
CASE IS < ep: l = ep
CASE IS < em: l = em
END SELECT
l$ = LEFT$(t$, l - 1) 'The left of the SN
r$ = MID$(t$, l + 1): r&& = VAL(r$) 'The right of the SN, turned into a workable long
IF INSTR(l$, ".") THEN 'Location of the decimal, if any
IF r&& > 0 THEN
r&& = r&& - LEN(l$) + 2
ELSE
r&& = r&& + 1
END IF
l$ = LEFT$(l$, 1) + MID$(l$, 3)
END IF
SELECT CASE r&&
CASE 0 'what the heck? We solved it already?
'l$ = l$
CASE IS < 0
FOR i = 1 TO -r&&
l$ = "0" + l$
NEXT
l$ = "0." + l$
CASE ELSE
FOR i = 1 TO r&&
l$ = l$ + "0"
NEXT
END SELECT
N2S$ = sign$ + l$
END SUB
For you guys who don't know, this routine is something which you probably already use a lot of the time without even realizing it -- it's the way CONST does our math calculations for us in QB64, when we type something like CONST x = 123 + 456 * 789 + COS(.1) + SIN(_D2R(45))
Recent releases of QB64 have had issues with CONST acting up with a few different things (in particular the color commands), and if you check the original post for this routine, you might be able to see why fairly easily: They weren't included in the basic math handler here, so they had to be processed manually via a different method.
The interaction of this substitution method and that substitution method, along with commas and multiple variables being on the same line... just got lost, muddled, and corrupted somewhere.
CONST Red = _RGB32(255,0,0) works as it should.
CONST Red = _RGB32(255,0,0), Yellow = _RGB32(0,255,0) <-- this gets corrupted between all the various substitution methods and goofs up for us.
So, as a simple way to streamline the process and clean up the CONST command so it won't be as hard to both expand and debug in the future, I've expanded the math evaluator.
In the past, we only worked with basic single values. SIN(x) for example, or "2 + 3". We could work with one operator (plus, minus, SIN, ect), and one value to the left of it, and one value to the right of it.
1 + 2 <-- this used the left 1, the right 2, and the operator +
SIN(.2) <-- this just used the right .2, and the operator SIN
Commands with multiple parameters didn't work, so we couldn't use them.
_RGB32(255,0,0) <--- the commas in here separate our three values, and would error out...
This overhaul of the math evaluator removes that restriction. We can now teach it to parse and process functions with multiple parameters, such as _RGB, _RGB32, and all.
In the long run, this will end up being something which I'll swap out to expand/replace our current math evaluation routine, but it could use some extra user testing to make certain nothing glitches out, locks up, or returns false values first.
So...
Kindly test it out. Toss it all sorts of values (particularly any related to the various _RGB, _RGB32, _RGBA, _RGBA32 commands, and any with stray commas anywhere you'd like), and see if it works as intended. This thing actually does a good bit of error checking for us, so you'll get a whole variety of error messages to help you diagnose what's wrong with your formula as you type it -- if any seem inappropriate, are worded in a confusing manner, or wrong, kindly report those back to me and I'll try and make them more concise to help debug the issue.
Test it, try to break it, and report back on your results, while I go ahead and assume it's working as intended and expand it to work with several more commands/values which it's currently missing like _RED, _GREEN, _BLUE, _RED32, _GREEN32, _BLUE32, _ALPHA....
