//
// $Id$
//

#include "set.ch"

//
// Strip
//
// The Harbour stripping command
//
// Date : 04/05/1999
//
// Usage : Strip( FileFrom, FileTo )
//
// The output from FileFrom is copied to FileTo except for the empty lines
//
// Default files : From = strip.prg To = strip.out
//

/*
 * Written by Eddie Runia <eddie@runia.com>
 * www - http://www.harbour-project.org
 *
 * Placed in the public domain
 */

function Main( cFrom, cTo )

   local oFrom
   local oTo
   local cOut

   set( _SET_EXACT, .T.)
   cFrom := Default( cFrom, "strip.prg" )
   cTo   := Default( cTo,   "strip.out" )

   oFrom := TTextFile()
//   Debug( __objGetMethodList( oFrom ) )
   oFrom:New( cFrom, "R" )
   oTo   := TTextFile()
//   Debug( __objGetMethodList( oTo ) )
   oTo:New( cTo  , "W" )

   do while !oFrom:EoF()
      cOut := oFrom:Run()
      if alltrim(cOut) != ""
         oTo:Run( cOut )
      endif
   enddo
   QOut( "Number of lines", oTo:nLine )
   oFrom:Dispose()
   oTo:Dispose()
return nil


//
// Generic DOS file handler
//
function TTextFile()                            // Parameter = dirty

   static oFile := NIL

   if oFile == NIL
      oFile := TClass():New( "TTEXTFILE" )      // Create a new class def

      oFile:AddData( "cFileName"  )             // Filename spec. by user
      oFile:AddData( "hFile"      )             // File handle
      oFile:AddData( "nLine"      )             // Current linenumber
      oFile:AddData( "nError"     )             // Last error
      oFile:AddData( "lEoF"       )             // End of file
      oFile:AddData( "cBlock"     )             // Storage block
      oFile:AddData( "nBlockSize" )             // Size of read-ahead buffer
      oFile:AddData( "cMode"      )             // Mode of file use
                                                // R = read, W = write

      oFile:AddMethod( "New"    , @New()     )  // Constructor
      oFile:AddMethod( "Dispose", @Dispose() )  // Clean up code
      oFile:AddMethod( "Read"   , @Read()    )  // Read line
      oFile:AddMethod( "WriteLn", @WriteLn() )  // Write line
      oFile:AddMethod( "Goto"   , @Goto()    )  // Go to line

      oFile:AddInline( "Run"    , ;             // Get/set data
      {|self,xTxt,lCRLF|If( ::cMode == "R",::Read(),::WriteLn(xTxt, lCRLF)) } )
      oFile:AddInline( "Write"  , {|self, xTxt|::WriteLn( xTxt, .F. ) } )
                                                // Write without CR
      oFile:AddInline( "EoF"    , {|self|::lEoF} )
                                                // End of file as function
      oFile:Create()
   endif
return  oFile:Instance()


//
// Method TextFile:New -> Create a new text file
//
// <cFile>      file name. No wild characters
// <cMode>      mode for opening. Default "R"
// <nBlockSize> Optional maximum blocksize
//
function New( cFileName, cMode, nBlock )

   local self := QSelf()                        // Get self

   ::nLine     := 0
   ::lEoF      := .F.
   ::cBlock    := ""
   ::cFileName := cFileName
   ::cMode     := Default( cMode, "R" )

   if ::cMode == "R"
      ::hFile := fOpen( cFileName )
   elseif ::cMode == "W"
      ::hFile := fCreate( cFileName )
   else
      QOut( "DosFile Init: Unknown file mode:", ::cMode )
   endif

   ::nError := fError()
   if ::nError != 0
      ::lEoF := .T.
      QOut( "Error ", ::nError)
   endif
   ::nBlockSize := Default( nBlock, 4096 )

return self


//
// Dispose -> Close the file handle
//
function Dispose()

   local self := QSelf()

   ::cBlock := NIL
   if ::hFile != -1
      if ::cMode == "W" .and. ::nError != 0
         ::Write( Chr(26) )                     // Do not forget EOF marker
      endif
      if !fClose(::hFile)
         ::nError := fError()
         QOut( "Dos Error closing ", ::cFileName, " Code ", ::nError)
      endif
   endif
return self


//
// Read a single line
//
function Read()

   local self := QSelf()
   local cRet  := ""
   local cBlock
   local nCrPos
   local nEoFPos
   local nRead

   if ::hFile == -1
      QOut( "DosFile:Read : No file open" )
   elseif ::cMode != "R"
      QOut( "File ", ::cFileName, " not open for reading" )
   elseif !::lEoF

      if Len(::cBlock) == 0                     // Read new block
         cBlock := fReadStr( ::hFile, ::nBlockSize )
         if len(cBlock) == 0
            ::nError := fError()                // Error or EOF
            ::lEoF   := .T.
         else
            ::cBlock := cBlock
         endif
      endif

      if !::lEoF
         ::nLine := ::nLine + 1                 // ++ not available
         nCRPos := At(Chr(10), ::cBlock)
         if nCRPos != 0                         // More than one line read
            cRet     := Substr( ::cBlock, 1, nCRPos - 1)
            ::cBlock := Substr( ::cBlock, nCRPos + 1)
         else                                   // No complete line
            cRet     := ::cBlock
            ::cBlock := ""
            cRet     += ::Read()                // Read the rest
            if !::lEoF
               ::nLine := ::nLine - 1           // Adjust erroneous line count
            endif
         endif
         nEoFPos := At( Chr(26), cRet )
         if nEoFPos != 0                        // End of file read
            cRet   := Substr( cRet, 1, nEoFPos-1 )
            ::lEoF := .T.
         endif
         cRet := Strtran( cRet, Chr(13), "" )   // Remove CR
      endif
   endif
return cRet


//
// WriteLn -> Write a line to a file
//
// <xTxt>  Text to write. May be any type. May also be an array containing
//         one or more strings
// <lCRLF> End with Carriage Return/Line Feed (Default == TRUE)
//
function WriteLn( xTxt, lCRLF )

   local self := QSelf()
   local cBlock

   if ::hFile == -1
      QOut( "DosFile:Write : No file open" )
   elseif ::cMode != 'W'
      QOut( "File ", ::cFileName," not opened for writing" )
   else
      cBlock := ToChar( xTxt )                  // Convert to string
      if Default( lCRLF, .T. )
         cBlock += Chr(10)                      // +chr(13) ??
      endif
      fWrite( ::hFile, cBlock, len(cBlock) )
      if fError() != 0
         ::nError := fError()                   // Not completely written !
      endif
      ::nLine := ::nLine + 1
   endif
return self


//
// Go to a specified line number
//
function Goto( nLine )

   local self   := QSelf()
   local nWhere := 1

   if Empty(::hFile)
      QOut( "DosFile:Goto : No file open" )
   elseif  ::cMode != "R"
      QOut( "File ", ::cFileName, " not open for reading" )
   else
      ::lEoF   := .F.                           // Clear (old) End of file
      ::nLine  := 0                             // Start at beginning
      ::cBlock := ""
      fSeek(::hFile, 0)                         // Go top
      do while !::lEoF .and. nWhere < nLine
         nWhere++
         ::Run()
      enddo
   endif
return !::lEoF