module Presyntax.Tokens where

import qualified Data.Text as T
import Data.Text (Text)

data TokenClass
  = TokVar Text
  | TokEof

  | TokLambda
  | TokArrow
  | TokUnder

  | TokOParen
  | TokOBrace
  | TokOSquare

  | TokCParen
  | TokCBrace
  | TokCSquare

  -- {-# #-}
  | TokOPragma
  | TokCPragma

  | TokPrim

  | TokReplLet
  | TokReplT Text

  | TokStar
  | TokColon
  | TokEqual
  | TokComma

  | TokPi1
  | TokPi2
  | TokLet
  | TokIn
  | TokLStart
  | TokLEnd

  | TokAnd
  | TokOr

  | TokAs
  | TokWhere
  | TokCase

  | TokPostulate
  | TokData

  | TokSemi
  deriving (Eq, Show, Ord)

tokSize :: TokenClass -> Int
tokSize (TokVar x) = T.length x
tokSize TokEof = 0
tokSize TokLambda = 1
tokSize TokOParen = 1
tokSize TokOBrace = 1
tokSize TokOSquare = 1
tokSize TokCBrace = 1
tokSize TokCParen = 1
tokSize TokCSquare = 1
tokSize TokCPragma = 3
tokSize TokOPragma = 3
tokSize TokPrim = length "PRIMITIVE"
tokSize TokStar = 1
tokSize TokColon = 1
tokSize TokEqual = 1
tokSize TokComma = 1
tokSize TokSemi = 1
tokSize TokUnder = 1
tokSize TokArrow = 2
tokSize TokPi1 = 2
tokSize TokPi2 = 2
tokSize TokReplLet = 4
tokSize TokAnd = 2
tokSize TokOr = 2
tokSize TokAs = 2
tokSize (TokReplT s) = T.length s
tokSize TokLet = 3
tokSize TokIn = 2
tokSize TokLStart = 0
tokSize TokLEnd = 0
tokSize TokWhere = length "where"
tokSize TokData = length "data"
tokSize TokCase = length "case"
tokSize TokPostulate = length "postulate"

data Token
  = Token { tokenClass   :: TokenClass
          , tokStartLine :: !Int
          , tokStartCol  :: !Int
          }
  deriving (Eq, Show, Ord)