# Basic (mostly) langauge independent types
# These are the foundation for understanding the source code

token WS / space /

context number
   context unsigned
      lex
         literal `true `false
         token OCT / '0'[0-7]+ /
         token DEC / [0-9]+ /
         token HEX / '0x' xdigit+ /
         literal `0b
      end

      token BIN / [0-1]+ /

      int strtoull(a:str, b:int) = c_strtoull

      def type
         value:int
         [`false] { lhs.value = 0 }
      |  [`true] { lhs.value = 1 }
      |  [`0b BIN] { lhs.value = strtoull($r2, 2) }
      |  [OCT] { lhs.value = strtoull($r1, 8) }
      |  [DEC] { lhs.value = strtoull($r1, 10) }
      |  [HEX] { lhs.value = strtoull($r1, 16) }
   end

   lex
      ignore / space+ /
      literal `+ `-
   end

   def type
      value:int
      [unsigned::type] { lhs.value = r1.value }
   |  [`- type] { lhs.value = r2.value - (r2.value * 2) }
   |  [`+ type] { lhs.value = r2.value }
end

context string
   lex
      literal `' `"
      token ESC / '\\' /
      token CHR / [abfnrtv\\'"e] /
      token HEX / 'x' xdigit{2} /
      token OCT / [0-7]{1,3} /
   end

   token CHAR_SQ / ^cntrl - ['\\] /
   token CHAR_DQ / ^cntrl - ["\\] /

   int strtoull(a:str, b:int) = c_strtoull
   str esc2chr(a:str) = c_esc2chr
   str num2chr(a:int) = c_num2chr

   def escape
      data:str
      [ESC CHR] { lhs.data = esc2chr($r2) }
   |  [ESC HEX] { lhs.data = num2chr(strtoull('0' + $r2, 16)) }
   |  [ESC OCT] { lhs.data = num2chr(strtoull($r2, 8)) }

   def double_quoted
      data:str
      [escape] { lhs.data = r1.data } | [CHAR_DQ] { lhs.data = $r1 }

   def single_quoted
      data:str
      [escape] { lhs.data = r1.data } | [CHAR_SQ] { lhs.data = $r1 }

   def type
      raw:str
      length:int
      escaped:str
      [`' single_quoted* `'] {
         lhs.raw = ''
         lhs.escaped = $r2
         for i:single_quoted in repeat(r2) lhs.raw = lhs.raw + i.data
         lhs.length = lhs.raw.data.length
      }
   |  [`" double_quoted* `"] {
         lhs.raw = ''
         lhs.escaped = $r2
         for i:double_quoted in repeat(r2) lhs.raw = lhs.raw + i.data
         lhs.length = lhs.raw.data.length
      }
end