imports
{
import CCO.SourcePos  (SourcePos)
}

-------------------------------------------------------------------------------
-- Source positions
-------------------------------------------------------------------------------

attr Tm
  syn pos :: {SourcePos}

sem Tm
  | Tm lhs.pos = @pos

attr Tm_
  inh pos :: {SourcePos}

sem Tm
  | Tm t.pos = @pos

-------------------------------------------------------------------------------
-- Utilities
-------------------------------------------------------------------------------

{
-- | Retrieves a textual description of a 'SourcePos'.
describeSourcePos :: SourcePos -> String
describeSourcePos (SourcePos (File file) (Pos ln col))
                                                 = file ++
                                                   ":line " ++ show ln ++
                                                   ":column " ++ show col
describeSourcePos (SourcePos (File file) EOF)    = file ++
                                                   ":<at end of file>"
describeSourcePos (SourcePos Stdin (Pos ln col)) = "line " ++ show ln ++
                                                   ":column " ++ show col
describeSourcePos (SourcePos Stdin EOF)          = "<at end of input>"
}