Logging, scanning, and singleton objects for Python: logscan.py and singleton.py

# - - -   S c a n . i s P o s

    def isPos ( self, p ):
        '''Is the current line at position p?
        '''

See Section 30, “Scan.__effPos(): Calculate an effective position” for the routine that converts negative positions to positive values.

        #-- 1 --
        # [ newP  :=  effective-pos(p) ]
        newP = self.__effPos ( p )

        #-- 2 --
        return (self.pos == newP)