math.nez

/**
 * Basic mathematic operator 
 * author: Kimio Kuramitsu
 */
 
/* Start Point */
File        = Expression .*

/* Code Layout */
_           = S*
S           = [ \t]
"+"         = '+' _
"-"         = '-' _
"*"         = '*' _
"/"         = '/' _
"%"         = '%' _
"("         = '(' _
")"         = ')' _

/* Expression */
Expression  = Sum
Sum         = Product {$left ("+" #Add / "-" #Sub) $right(Product) }*
Product     = Value {$left ("*" #Mul / "/" #Div / "%" #Mod) $right(Value) }*
Value       = { [0-9]+ #Integer } _
            / { [A-Za-z0-9_]+ #Variable } _
            / "(" Expression ")"

example Expression ~51adead '''
1
'''
example Expression ~9877061 '''
1+A*3
'''
example Expression ~1da9fbd '''
1 * 2 + 3
'''

format #Add[*] `($[0] + $[1])`
format #Sub[*] `($[0] - $[1])`
format #Mul[*] `($[0] * $[1])`
format #Div[*] `($[0] / $[1])`
format #Mod[*] `($[0] % $[1])`
format #Int[*] `${text}`
format #Variable[*] `${text}`

// formatted by $ nez format