Christmas Bird Count history report system

As with the HTML rendering, the first step is to break the logical row into one or more physical rows; see Section 29.4, “Row.fold(): Fold a logical row into physical rows”.

# - - -   R o w . f o

    def fo(self, s, maxPhysCols):
        '''Render this logical row as XSL-FO.
        '''
        #-- 1
        # [ rowList  :=  a list of PhysRow instances representing self
        #       folded into one or more physical rows each with no
        #       more than (maxPhysCols) detail columns
        #   nRows  :=  length of that list ]
        rowList = self.fold(maxPhysCols)
        nRows = len(rowList)

For the XSL-FO rendering logic, see Section 45.5, “PhysRow.fo(): Render as XSL-FO”, which needs to know the physical row number within the group so that it can implement row grouping.

        #-- 2
        # [ s  +:=  the rows of rowList rendered as XSL-FO with row
        #       grouping according to row position ]
        for rowx, physRow in enumerate(rowList):
            #-- 2 body
            # [ s  +:=  physRow rendered as XSL-FO with row grouping
            #           according to rowx ]
            physRow.fo(s, rowx, nRows)