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/*
* Reverse_Lines.bsh - a BeanShell macro script for reversing the order
* of lines in a buffer.  If there are selections, the lines in the selections
* will be reversed, otherwise the whole buffer will be reversed.
* NOTE: Lines are not sorted or reverse sorted, simply reversed.
*
* Copyright (C) 2002-2004 Ollie Rutherfurd, [email protected]
*
* :mode=beanshell:tabSize=4:indentSize=4:maxLineLen=0:noTabs=false:
* :indentOnTab=true:indentOnEnter=true:folding=explicit:collapseFolds=1:
*
* $Id: Reverse_Lines.bsh 23971 2015-08-08 19:37:35Z daleanson $
*/

// Localization
final static String NotWorkingRectangularSelectionError = jEdit.getProperty("macro.rs.ReverseLines.NotWorkingRectangularSelection.error", "Sorry, this macro doesn't work with Rectangular Selections.");
final static String NotEditableMessage = jEdit.getProperty("macro.rs.general.ErrorNotEditableDialog.message", "Buffer is not editable");

// Process
void reverseLines(textArea)
{
JEditBuffer buffer = textArea.getBuffer();
Selection[] selections = textArea.getSelection();

// doesn't work with rectangular selections, check for them up-front
for(int i = 0; i < selections.length; i++)
{
  if(selections[i] instanceof Selection.Rect)
  {
   Macros.error(view, NotWorkingRectangularSelectionError);
   return;
  }
}

// do whole buffer if no selections
if(selections.length == 0)
{
  StringBuffer sb = new StringBuffer(buffer.getLength());
  for(int i = buffer.getLineCount() - 1; i >= 0; i--)
  {
   String line = buffer.getLineText(i);
   sb.append(line);
   if(i > 0) // don't append a newline for the last line
    sb.append('\n');
  }
  buffer.remove(0, buffer.getLength());
  buffer.insert(0, sb.toString());
}
// reverse all lines that are selected *NOT* just selected portions of lines
else
{
  for(int i = 0; i < selections.length; i++){

   int startLine = selections[i].getStartLine();
   int endLine = selections[i].getEndLine();
   int startOffset = buffer.getLineStartOffset(startLine);

   if(startLine < endLine)
   {
    StringBuffer sb = new StringBuffer();
    for(int i = endLine; i > startLine; i--)
    {
     String line = buffer.getLineText(i);
     sb.append(line).append('\n');
    }

    // appending first line here, so a check
    // can be made to see whether to append
    // a newline (don't if the original line
    // was the last line of the buffer)
    sb.append(buffer.getLineText(startLine));
    if(endLine < buffer.getLineCount() - 1)
     sb.append('\n');

    String reversed = sb.toString();
    buffer.remove(startOffset, reversed.length());
    buffer.insert(startOffset, reversed);
   }
  }
}
}

reverseLines(textArea);

/*
Macro index entry (in DocBook XML)

<listitem>
<para><filename>Reverse_Lines.bsh</filename></para>
<abstract><para>
Reverses the selected lines or the entire buffer if no
lines are selected.  Does not support Rectangular
Selections.
</para></abstract>
</listitem>
*/

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