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#!/usr/bin/env ruby -w
# encoding: UTF-8
#
# = TableColumnSorter.rb -- The TaskJuggler III Project Management Software
#
# Copyright (c) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014
# by Chris Schlaeger <cs@taskjuggler.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of version 2 of the GNU General Public License as
# published by the Free Software Foundation.
#
class TaskJuggler
# This class can rearrange the columns of a table according to a new order
# determined by an Array of table headers. The table is an Array of table
# lines. Each line is another Array. The first line of the table is an Array
# of the headers of the columns.
class TableColumnSorter
attr_reader :discontinuedColumns
# Register a new table for rearranging.
def initialize(table)
@oldTable = table
@discontinuedColumns = nil
end
# Rearrange the registered table. The old table won't be modified. The
# method returns a new table (Array of Arrays). _newHeaders_ is an Array
# that represents the new column headers. The columns that are not in the
# new header will be the last columns of the new table.
def sort(newHeaders)
# Maps old index to new index.
columnIdxMap = {}
newHeaderIndex = newHeaders.length
oldHeaders = @oldTable[0]
discontinuedHeaders = []
oldHeaders.length.times do |i|
if (ni = newHeaders.index(oldHeaders[i]))
# This old column is still in the new header
columnIdxMap[i] = ni
else
# This old column is no longer contained in the new header. We
# append it at the end.
columnIdxMap[i] = newHeaderIndex
discontinuedHeaders << oldHeaders[i]
newHeaderIndex += 1
end
end
# We construct a new table from scratch. All values from the old table
# are copied over. columns in the new table that were not contained in
# the old table will be filled with nil.
newTable = []
@oldTable.length.times do |lineIdx|
oldLine = @oldTable[lineIdx]
if lineIdx == 0
# Insert the new headers. The discontinued ones will be added below.
newTable[0] = newHeaders
else
# Add a line of nils to the new table.
newTable[lineIdx] = Array.new(newHeaderIndex, nil)
end
# Copy the old column to the new position.
columnIdxMap.each do |oldColIdx, newColIdx|
newTable[lineIdx][newColIdx] = oldLine[oldColIdx]
end
end
# Now we need to add the new column headers that were not in the old
# headers.
#newTable[0] += discontinuedHeaders
@discontinuedColumns = discontinuedHeaders.length
newTable
end
end
end
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