#config parser:

#syntax:
#  #its a comment
#  x = 7 # comment inside a line
#  x = "string#its not a comment"
#  x =  {
#        item = 2 # its is an item
#        #its an object/dictionary
#  }
# x = @y # its is a reusing of config variables previously declared


from plex import *

#digits
digit = Range('09')
hexa_digit = digit + Range('afAF')
dhexa_digit = hexa_digit + hexa_digit
qhexa_digit = dhexa_digit + dhexa_digit
oct_digit = Range('07')
doct_digit = oct_digit + oct_digit
bin_digit = Range('01')

#escapes
esc_quote = Str("\\'")
esc_dquote = Str('\\"')
esc_nline = Str('\\n')
esc_cr = Str('\\r')
esc_table = Str('\\t')
esc_backslash = Str('\\\\')
esc_bell = Str('\\a')
esc_bs = Str('\\b')
esc_vertical = Str('\\v')
esc_question = Str('\\?')
esc_hexa = Str('\\x') + dhexa_digit | qhexa_digit
esc_oct = Str('\\o') + doct_digit
esc_bin = Str('\\b') + Rep(bin_digit)

escapes = esc_quote | esc_dquote | esc_nline | esc_cr | esc_table | esc_backslach | esc_bell |\
          esc_bs | esc_vertical | esc_question | esc_hexa | esc_oct | esc_bin

#simbols

letter = Range("AZaz")
number = Rep1(digit)
hexa = Str('0x') + Rep(hexa_digt)
octa = Str('0') + Rep(oct_digt)
space = Any(" \t\n")
comment = Str("#") + Rep(AnyBut(Eol))
quote = Str("'")
dquote = Str('"')
name = letter + Rep(letter | digit)
getvar = Str('@') + name

#mathematics

plus = Str('+')
sub = Str('-')
mul = Str('*')
div = Str('/')
mod = Str('%')

#lists, dicts
enter_dict = Str('{')
leave_dict = Str('}')
enter_list = Str('[')
leave_list = Str(']')


str_squote = quote + Rep(AnyBut("'") | escapes)  + quote
str_dquote = dquote + Rep(Anybut('"') | escapes) + dquote
string = rep(space | str_dquote | str_squote)