// BubFns
BubFns = BubFn ZeroOrMoreBubFns / f
ZeroOrMoreBubFns = SpaceAndBubFn ZeroOrMoreBubFns / ()

SpaceAndBubFn = Space BubFn / f

// BubFn
// BubFn = Sum Space Sum Space Sum Space OrOrExpr Space Sum
BubFn = SumAndSpace BubFn1 / f
BubFn1 = SumAndSpace BubFn2 / f
BubFn2 = SumAndSpace BubFn3 / f
BubFn3 = OrOrExprAndSpace BubFn4 / f
BubFn4 = Sum () / f

SumAndSpace = Sum Space / f
OrOrExprAndSpace = OrOrExpr Space / f

// OrOr Expr
OrOrExpr = AndAndExpr OrOrExpr1 / AndAndExpr
OrOrExpr1 = OrOr OrOrExpr / f

OrOr = { Str("||") } () / f

// AndAnd Expr
AndAndExpr = ComparisonExpr AndAndExpr1 / ComparisonExpr
AndAndExpr1 = AndAnd AndAndExpr / f

AndAnd = { Str("&&") } () / f

// Comparison Expr
ComparisonExpr = Sum ComparisonExpr1 / f
ComparisonExpr1 = Comparison Sum / f

Comparison = EqEq () / Comparison1
Comparison1 = Ne () / Comparison2
Comparison2 = Ge () / Comparison3
Comparison3 = Le () / Comparison4
Comparison4 = Gt () / Comparison5
Comparison5 = Lt () / f

EqEq = { Str("==") } () / f
Ne = { Str("!=") } () / f
Ge = { Str(">=") } () / f
Le = { Str("<=") } () / f
Gt = { Char('>') } () / f
Lt = { Char('<') } () / f

// Sum
Sum = Term ZeroOrMorePlusOrMinusAndTerms / f
ZeroOrMorePlusOrMinusAndTerms = PlusOrMinusAndTerm ZeroOrMorePlusOrMinusAndTerms / ()
PlusOrMinusAndTerm = PlusOrMinus Term / f

// Term
Term = Factor ZeroOrMoreStarOrSlashAndFactors / f
ZeroOrMoreStarOrSlashAndFactors = StarOrSlashAndFactor ZeroOrMoreStarOrSlashAndFactors / ()
StarOrSlashAndFactor = StarOrSlash Factor / f

// Factor
Factor = PlusOrMinus Factor / Power

// Power
Power = Atom PowerAndFactor / Atom
PowerAndFactor = { Char('^') } Factor / f

// Atom
Atom = ExprInParentheses () / Atom1
Atom1 = FloatLiteral () / Atom2
Atom2 = IntegerLiteral () / Atom3
Atom3 = Function () / Atom4
Atom4 = Variable () / Atom5
Atom5 = Constant () / f

// Variable
Variable = UppercaseX () / Variable1
Variable1 = UppercaseY () / Variable2
Variable2 = UppercaseZ () / Variable3
Variable3 = LowercaseX () / Variable4
Variable4 = LowercaseY () / Variable5
Variable5 = LowercaseZ () / Variable6
Variable6 = UppercaseN () / Variable7
Variable7 = LowercaseN () / Variable8
Variable8 = UppercaseF () / Variable9
Variable9 = UppercaseS () / f

UppercaseX = { Char('X') } () / f
UppercaseY = { Char('Y') } () / f
UppercaseZ = { Char('Z') } () / f
LowercaseX = { Char('x') } () / f
LowercaseY = { Char('y') } () / f
LowercaseZ = { Char('z') } () / f
UppercaseN = { Char('N') } () / f
LowercaseN = { Char('n') } () / f
UppercaseF = { Char('F') } () / f
UppercaseS = { Char('S') } () / f

// Constant
Constant = E () / Constant1
Constant1 = Pi () / f

E = { Char('E') } () / f
Pi = { Str("PI") } () / f

// Function
Function = Sine () / Function1
Function1 = Cosine () / Function2
Function2 = Tangent () / Function3
Function3 = Ln () / Function4
Function4 = Lg () / f

Sine = { Str("sin") } Factor / f
Cosine = { Str("cos") } Factor / f
Tangent = { Str("tan") } Factor / f
Ln = { Str("ln") } Factor / f
Lg = { Str("lg") } Factor / f

// Delimiters
ExprInParentheses = { Char('(') } ExprAndClose / f
ExprAndClose = Sum { Char(')') } / f

// Integer
IntegerLiteral = DecLiteral () / f

// Float
FloatLiteral = DecLiteral PointAndDecLiteral / BytesF64Literal
PointAndDecLiteral = { Char('.') } DecLiteral / f

BytesF64Literal = { Char('b') } ???????? / f

// Dec
DecLiteral = DecDigit ZeroOrMoreDecDigits / f
ZeroOrMoreDecDigits = DecDigit ZeroOrMoreDecDigits / ()

DecDigit = { Char('0') } () / DecDigit1
DecDigit1 = { Char('1') } () / DecDigit2
DecDigit2 = { Char('2') } () / DecDigit3
DecDigit3 = { Char('3') } () / DecDigit4
DecDigit4 = { Char('4') } () / DecDigit5
DecDigit5 = { Char('5') } () / DecDigit6
DecDigit6 = { Char('6') } () / DecDigit7
DecDigit7 = { Char('7') } () / DecDigit8
DecDigit8 = { Char('8') } () / { Char('9') }

// Others
PlusOrMinus = Plus () / PlusOrMinus1
PlusOrMinus1 = Minus () / f
Plus = { Char('+') } () / f
Minus = { Char('-') } () / f

StarOrSlash = Star () / StarOrSlash1
StarOrSlash1 = Slash () / f
Star = { Char('*') } () / f
Slash = { Char('/') } () / f

Space = { Char(' ') } () / f