# From https://sourceforge.net/p/npppythonscript/discussion/1199074/thread/988630ae/

def getWord_Sel(selNum): # tuple of: word, word_start, word_end

sPos = editor.getSelectionNStart(selNum)

ePos = editor.getSelectionNEnd(selNum)

if sPos != ePos:

sWrd = editor.getTextRange(sPos, ePos)

else:

sPos = editor.wordStartPosition(sPos, True)

ePos = editor.wordEndPosition(sPos, True)

sWrd = editor.getTextRange(sPos, ePos)

return (sWrd, sPos, ePos)

def replaceWords(var1, var2):

editor.setTarget(var2[1], var2[2])

editor.replaceTarget(var1[0])

editor.setTarget(var1[1], var1[2])

editor.replaceTarget(var2[0])

return len(var2[0]) - len(var1[0])

def setSels(var1, var2, diff):

editor.setSelection(var1[1], var1[1]+len(var2[0]))

editor.addSelection(var2[1]+diff, var2[1]+diff+len(var1[0]))

selsCt = editor.getSelections()

if selsCt == 2:

editor.beginUndoAction()

tSel1 = getWord_Sel(0)

tSel2 = getWord_Sel(1)

if tSel1[1] < tSel2[1]:

sel1, sel2 = tSel1, tSel2

else:

sel1, sel2 = tSel2, tSel1

diff = replaceWords(sel1, sel2)

setSels(sel1, sel2, diff)

editor.endUndoAction()