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generic_spreadsheet.rb
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generic_spreadsheet.rb
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require 'rubygems'
require 'builder'
# Base class for all other types of spreadsheets
class GenericSpreadsheet
attr_reader :default_sheet
# sets the line with attribute names (default: 1)
attr_accessor :header_line
def initialize
end
# set the working sheet in the document
def default_sheet=(sheet)
if sheet.kind_of? Fixnum
if sheet >= 0 and sheet <= sheets.length
sheet = self.sheets[sheet-1]
else
raise RangeError
end
elsif sheet.kind_of?(String)
raise RangeError if ! self.sheets.include?(sheet)
else
raise TypeError, "what are you trying to set as default sheet?"
end
@default_sheet = sheet
check_default_sheet
@first_row[sheet] = @last_row[sheet] = @first_column[sheet] = @last_column[sheet] = nil
@cells_read[sheet] = false
end
# first non-empty column as a letter
def first_column_as_letter(sheet=nil)
GenericSpreadsheet.number_to_letter(first_column(sheet))
end
# last non-empty column as a letter
def last_column_as_letter(sheet=nil)
GenericSpreadsheet.number_to_letter(last_column(sheet))
end
# returns the number of the first non-empty row
def first_row(sheet=nil)
if sheet == nil
sheet = @default_sheet
end
read_cells(sheet) unless @cells_read[sheet]
if @first_row[sheet]
return @first_row[sheet]
end
impossible_value = 999_999 # more than a spreadsheet can hold
result = impossible_value
@cell[sheet].each_pair {|key,value|
y,x = key # _to_string(key).split(',')
y = y.to_i
result = [result, y].min if value
} if @cell[sheet]
result = nil if result == impossible_value
@first_row[sheet] = result
result
end
# returns the number of the last non-empty row
def last_row(sheet=nil)
sheet = @default_sheet unless sheet
read_cells(sheet) unless @cells_read[sheet]
if @last_row[sheet]
return @last_row[sheet]
end
impossible_value = 0
result = impossible_value
@cell[sheet].each_pair {|key,value|
y,x = key # _to_string(key).split(',')
y = y.to_i
result = [result, y].max if value
} if @cell[sheet]
result = nil if result == impossible_value
@last_row[sheet] = result
result
end
# returns the number of the first non-empty column
def first_column(sheet=nil)
if sheet == nil
sheet = @default_sheet
end
read_cells(sheet) unless @cells_read[sheet]
if @first_column[sheet]
return @first_column[sheet]
end
impossible_value = 999_999 # more than a spreadsheet can hold
result = impossible_value
@cell[sheet].each_pair {|key,value|
y,x = key # _to_string(key).split(',')
x = x # .to_i
result = [result, x].min if value
} if @cell[sheet]
result = nil if result == impossible_value
@first_column[sheet] = result
result
end
# returns the number of the last non-empty column
def last_column(sheet=nil)
sheet = @default_sheet unless sheet
read_cells(sheet) unless @cells_read[sheet]
if @last_column[sheet]
return @last_column[sheet]
end
impossible_value = 0
result = impossible_value
@cell[sheet].each_pair {|key,value|
y,x = key # _to_string(key).split(',')
x = x.to_i
result = [result, x].max if value
} if @cell[sheet]
result = nil if result == impossible_value
@last_column[sheet] = result
result
end
# returns a rectangular area (default: all cells) as yaml-output
# you can add additional attributes with the prefix parameter like:
# oo.to_yaml({"file"=>"flightdata_2007-06-26", "sheet" => "1"})
def to_yaml(prefix={}, from_row=nil, from_column=nil, to_row=nil, to_column=nil,sheet=nil)
sheet = @default_sheet unless sheet
result = "--- \n"
(from_row||first_row(sheet)).upto(to_row||last_row(sheet)) do |row|
(from_column||first_column(sheet)).upto(to_column||last_column(sheet)) do |col|
unless empty?(row,col,sheet)
result << "cell_#{row}_#{col}: \n"
prefix.each {|k,v|
result << " #{k}: #{v} \n"
}
result << " row: #{row} \n"
result << " col: #{col} \n"
result << " celltype: #{self.celltype(row,col,sheet)} \n"
if self.celltype(row,col,sheet) == :time
result << " value: #{GenericSpreadsheet.integer_to_timestring( self.cell(row,col,sheet))} \n"
else
result << " value: #{self.cell(row,col,sheet)} \n"
end
end
end
end
result
end
# write the current spreadsheet to stdout or into a file
def to_csv(filename=nil,sheet=nil)
sheet = @default_sheet unless sheet
if filename
file = File.open(filename,"w") # do |file|
write_csv_content(file,sheet)
file.close
else
write_csv_content(STDOUT,sheet)
end
true
end
# find a row either by row number or a condition
# Caution: this works only within the default sheet -> set default_sheet before you call this method
# (experimental. see examples in the test_roo.rb file)
def find(*args) # :nodoc
result_array = false
args.each {|arg,val|
if arg.class == Hash
arg.each { |hkey,hval|
if hkey == :array and hval == true
result_array = true
end
}
end
}
column_with = {}
1.upto(last_column) do |col|
column_with[cell(@header_line,col)] = col
end
result = Array.new
#-- id
if args[0].class == Fixnum
rownum = args[0]
if @header_line
tmp = {}
else
tmp = []
end
1.upto(self.row(rownum).size) {|j|
x = ''
column_with.each { |key,val|
if val == j
x = key
end
}
if @header_line
tmp[x] = cell(rownum,j)
else
tmp[j-1] = cell(rownum,j)
end
}
if @header_line
result = [ tmp ]
else
result = tmp
end
#-- :all
elsif args[0] == :all
if args[1].class == Hash
args[1].each {|key,val|
if key == :conditions
column_with = {}
1.upto(last_column) do |col|
column_with[cell(@header_line,col)] = col
end
conditions = val
first_row.upto(last_row) do |i|
# are all conditions met?
found = 1
conditions.each { |key,val|
if cell(i,column_with[key]) == val
found *= 1
else
found *= 0
end
}
if found > 0
tmp = {}
1.upto(self.row(i).size) {|j|
x = ''
column_with.each { |key,val|
if val == j
x = key
end
}
tmp[x] = cell(i,j)
}
if result_array
result << self.row(i)
else
result << tmp
end
end
end
end # :conditions
}
end
end
result
end
# returns all values in this row as an array
# row numbers are 1,2,3,... like in the spreadsheet
def row(rownumber,sheet=nil)
sheet = @default_sheet unless sheet
read_cells(sheet) unless @cells_read[sheet]
result = []
first_column(sheet).upto(last_column(sheet)) do |col|
result << cell(rownumber,col,sheet)
end
result
end
# returns all values in this column as an array
# column numbers are 1,2,3,... like in the spreadsheet
def column(columnnumber,sheet=nil)
if columnnumber.class == String
columnnumber = Excel.letter_to_number(columnnumber)
end
sheet = @default_sheet unless sheet
read_cells(sheet) unless @cells_read[sheet]
result = []
first_row(sheet).upto(last_row(sheet)) do |row|
result << cell(row,columnnumber,sheet)
end
result
end
# reopens and read a spreadsheet document
def reload
ds = @default_sheet
initialize(@filename) if self.class == Openoffice or
self.class == Excel
initialize(@spreadsheetkey,@user,@password) if self.class == Google
self.default_sheet = ds
#@first_row = @last_row = @first_column = @last_column = nil
end
# true if cell is empty
def empty?(row, col, sheet=nil)
sheet = @default_sheet unless sheet
read_cells(sheet) unless @cells_read[sheet] or self.class == Excel
row,col = normalize(row,col)
return true unless cell(row, col, sheet)
return true if celltype(row, col, sheet) == :string && cell(row, col, sheet).empty?
return true if row < first_row(sheet) || row > last_row(sheet) || col < first_column(sheet) || col > last_column(sheet)
false
end
# recursively removes the current temporary directory
# this is only needed if you work with zipped files or files via the web
def remove_tmp
if File.exists?(@tmpdir)
FileUtils::rm_r(@tmpdir)
end
end
# Returns information of the spreadsheet document and all sheets within
# this document.
def info
result = "File: #{File.basename(@filename)}\n"+
"Number of sheets: #{sheets.size}\n"+
"Sheets: #{sheets.map{|sheet| sheet+", "}.to_s[0..-3]}\n"
n = 1
sheets.each {|sheet|
self.default_sheet = sheet
result << "Sheet " + n.to_s + ":\n"
unless first_row
result << " - empty -"
else
result << " First row: #{first_row}\n"
result << " Last row: #{last_row}\n"
result << " First column: #{GenericSpreadsheet.number_to_letter(first_column)}\n"
result << " Last column: #{GenericSpreadsheet.number_to_letter(last_column)}"
end
result << "\n" if sheet != sheets.last
n += 1
}
result
end
def to_xml
xml_document = ''
xml = Builder::XmlMarkup.new(:target => xml_document, :indent => 2)
xml.instruct! :xml, :version =>"1.0", :encoding => "utf-8"
xml.spreadsheet {
self.sheets.each do |sheet|
self.default_sheet = sheet
xml.sheet(:name => sheet) { |x|
if first_row and last_row and first_column and last_column
# sonst gibt es Fehler bei leeren Blaettern
first_row.upto(last_row) do |row|
first_column.upto(last_column) do |col|
unless empty?(row,col)
x.cell(cell(row,col),
:row =>row,
:column => col,
:type => celltype(row,col))
end
end
end
end
}
end
}
xml_document
end
protected
def file_type_check(filename, ext, name)
new_expression = {
'.ods' => 'Openoffice.new',
'.xls' => 'Excel.new',
'.xlsx' => 'Excelx.new',
'.xml' => 'Excel2003.new'
}
case ext
when '.ods', '.xls', '.xlsx', '.xml'
correct_class = "use #{new_expression[ext]} to handle #{ext} spreadsheet files"
else
raise "unknown file type: #{ext}"
end
if File.extname(filename).downcase != ext
case @file_warning
when :error
warn correct_class
raise TypeError, "#{filename} is not #{name} file"
when :warning
warn "are you sure, this is #{name} spreadsheet file?"
warn correct_class
when :ignore
# ignore
else
raise "#{@file_warning} illegal state of file_warning"
end
end
end
# konvertiert einen Key in der Form "12,45" (=row,column) in
# ein Array mit numerischen Werten ([12,45])
# Diese Methode ist eine temp. Loesung, um zu erforschen, ob der
# Zugriff mit numerischen Keys schneller ist.
def key_to_num(str)
r,c = str.split(',')
r = r.to_i
c = c.to_i
[r,c]
end
# siehe: key_to_num
def key_to_string(arr)
"#{arr[0]},#{arr[1]}"
end
private
# converts cell coordinate to numeric values of row,col
def normalize(row,col)
if row.class == String
if col.class == Fixnum
# ('A',1):
# ('B', 5) -> (5, 2)
row, col = col, row
else
raise ArgumentError
end
end
if col.class == String
col = GenericSpreadsheet.letter_to_number(col)
end
return row,col
end
# def open_from_uri(uri)
# require 'open-uri' ;
# tempfilename = File.join(@tmpdir, File.basename(uri))
# f = File.open(tempfilename,"wb")
# begin
# open(uri) do |net|
# f.write(net.read)
# end
# rescue
# raise "could not open #{uri}"
# end
# f.close
# File.join(@tmpdir, File.basename(uri))
# end
# OpenURI::HTTPError
# def open_from_uri(uri)
# require 'open-uri'
# #existiert URL?
# r = Net::HTTP.get_response(URI.parse(uri))
# raise "URL nicht verfuegbar" unless r.is_a? Net::HTTPOK
# tempfilename = File.join(@tmpdir, File.basename(uri))
# f = File.open(tempfilename,"wb")
# open(uri) do |net|
# f.write(net.read)
# end
# # rescue
# # raise "could not open #{uri}"
# # end
# f.close
# File.join(@tmpdir, File.basename(uri))
# end
def open_from_uri(uri)
require 'open-uri'
response = ''
begin
open(uri, "User-Agent" => "Ruby/#{RUBY_VERSION}") { |net|
response = net.read
tempfilename = File.join(@tmpdir, File.basename(uri))
f = File.open(tempfilename,"wb")
f.write(response)
f.close
}
rescue OpenURI::HTTPError
raise "could not open #{uri}"
end
File.join(@tmpdir, File.basename(uri))
end
def open_from_stream(stream)
tempfilename = File.join(@tmpdir, "spreadsheet")
f = File.open(tempfilename,"wb")
f.write(stream[7..-1])
f.close
File.join(@tmpdir, "spreadsheet")
end
# convert a number to something like 'AB' (1 => 'A', 2 => 'B', ...)
def self.number_to_letter(n)
letters=""
while n > 0
num = n%26
letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"[num-1,1] + letters
n = n.div(26)
end
letters
end
# convert letters like 'AB' to a number ('A' => 1, 'B' => 2, ...)
def self.letter_to_number(letters)
result = 0
while letters && letters.length > 0
character = letters[0,1].upcase
num = "ABCDEFGHIJKLMNOPQRSTUVWXYZ".index(character)
raise ArgumentError, "invalid column character '#{letters[0,1]}'" if num == nil
num += 1
result = result * 26 + num
letters = letters[1..-1]
end
result
end
def unzip(filename)
ret = nil
Zip::ZipFile.open(filename) do |zip|
ret = process_zipfile_packed zip
end
ret
end
# check if default_sheet was set and exists in sheets-array
def check_default_sheet
sheet_found = false
raise ArgumentError, "Error: default_sheet not set" if @default_sheet == nil
if sheets.index(@default_sheet)
sheet_found = true
end
if ! sheet_found
raise RangeError, "sheet '#{@default_sheet}' not found"
end
#raise ArgumentError, "Error: default_sheet not set" if @default_sheet == nil
end
def process_zipfile_packed(zip, path='')
ret=nil
if zip.file.file? path
# extract and return filename
@tmpdir = "oo_"+$$.to_s
unless File.exists?(@tmpdir)
FileUtils::mkdir(@tmpdir)
end
file = File.open(File.join(@tmpdir, path),"wb")
file.write(zip.read(path))
file.close
return File.join(@tmpdir, path)
else
unless path.empty?
path += '/'
end
zip.dir.foreach(path) do |filename|
ret = process_zipfile_packed(zip, path + filename)
end
end
ret
end
def write_csv_content(file=nil,sheet=nil)
file = STDOUT unless file
if first_row(sheet) # sheet is not empty
# first_row(sheet).upto(last_row(sheet)) do |row|
1.upto(last_row(sheet)) do |row|
1.upto(last_column(sheet)) do |col|
file.print(",") if col > 1
onecell = cell(row,col,sheet)
onecelltype = celltype(row,col,sheet)
file.print one_cell_output(onecelltype,onecell,empty?(row,col,sheet))
end
file.print("\n")
end # sheet not empty
end
end
def one_cell_output(onecelltype,onecell,empty)
str = ""
if empty
str += ''
else
case onecelltype
when :string
if onecell == ""
str << ''
else
onecell.gsub!(/"/,'""')
str << ('"'+onecell+'"')
end
when :float,:percentage
if onecell == onecell.to_i
str << onecell.to_i.to_s
else
str << onecell.to_s
end
when :formula
if onecell.class == String
if onecell == ""
str << ''
else
onecell.gsub!(/"/,'""')
str << '"'+onecell+'"'
end
elsif onecell.class == Float
if onecell == onecell.to_i
str << onecell.to_i.to_s
else
str << onecell.to_s
end
else
raise "unhandled onecell-class "+onecell.class.to_s
end
when :date
str << onecell.to_s
when :time
str << GenericSpreadsheet.integer_to_timestring(onecell)
else
raise "unhandled celltype "+onecelltype.to_s
end
end
str
end
# converts an integer value to a time string like '02:05:06'
def self.integer_to_timestring(content)
return content if String === content
h = (content/3600.0).floor
content = content - h*3600
m = (content/60.0).floor
content = content - m*60
s = content
sprintf("%02d:%02d:%02d",h,m,s)
end
end