Class: Excel

Inherits:
GenericSpreadsheet show all
Defined in:
lib/roo/excel.rb

Overview

Class for handling Excel-Spreadsheets

Constant Summary collapse

EXCEL_NO_FORMULAS =
'formulas are not supported for excel spreadsheets'

Instance Attribute Summary

Attributes inherited from GenericSpreadsheet

#default_sheet, #header_line

Instance Method Summary collapse

Methods inherited from GenericSpreadsheet

#column, #empty?, #find, #first_column, #first_column_as_letter, #info, #last_column, #last_column_as_letter, #last_row, #method_missing, #reload, #remove_tmp, #row, #to_csv, #to_xml, #to_yaml

Constructor Details

#initialize(filename, packed = nil, file_warning = :error) ⇒ Excel

Creates a new Excel spreadsheet object. Parameter packed: :zip - File is a zip-file



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# File 'lib/roo/excel.rb', line 100

def initialize(filename, packed = nil, file_warning = :error)
  super()
  @file_warning = file_warning
  @tmpdir = "oo_"+$$.to_s
  @tmpdir = File.join(ENV['ROO_TMP'], @tmpdir) if ENV['ROO_TMP'] 
  unless File.exists?(@tmpdir)
    FileUtils::mkdir(@tmpdir)
  end
  filename = open_from_uri(filename) if filename[0,7] == "http://"
  filename = open_from_stream(filename[7..-1]) if filename[0,7] == "stream:"
  filename = unzip(filename) if packed and packed == :zip
  begin
    file_type_check(filename,'.xls','an Excel')
    @filename = filename
    unless File.file?(@filename)
      raise IOError, "file #{@filename} does not exist"
    end
    @workbook = Spreadsheet.open(filename)
    @default_sheet = self.sheets.first
  ensure
    #if ENV["roo_local"] != "thomas-p"
    FileUtils::rm_r(@tmpdir)
    #end
  end
  @cell = Hash.new
  @read_first_100_rows = Hash.new
  @cell_type = Hash.new
  @formula = Hash.new
  @first_row = Hash.new
  @last_row = Hash.new
  @first_column = Hash.new
  @last_column = Hash.new
  @header_line = 1
  @cells_read = Hash.new
  @fonts = Hash.new
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class GenericSpreadsheet

Instance Method Details

#cell(row, col, sheet = nil) ⇒ Object

returns the content of a cell. The upper left corner is (1,1) or (‘A’,1)

Raises:

  • (ArgumentError)


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# File 'lib/roo/excel.rb', line 147

def cell(row,col,sheet=nil)
  sheet = @default_sheet unless sheet
  raise ArgumentError unless sheet
   unless @cells_read[sheet] or (@read_first_100_rows[sheet] and row < 100)
      read_cells(sheet) 
      raise "should be read" unless @cells_read[sheet]
  end

  row,col = normalize(row,col)
  if celltype(row,col,sheet) == :date
    yyyy,mm,dd = @cell[sheet][[row,col]].split('-')
    return Date.new(yyyy.to_i,mm.to_i,dd.to_i)
  end
  if celltype(row,col,sheet) == :string
    return platform_specific_iconv(@cell[sheet][[row,col]])
  else
    return @cell[sheet][[row,col]]
  end
end

#celltype(row, col, sheet = nil) ⇒ Object

returns the type of a cell:

  • :float

  • :string,

  • :date

  • :percentage

  • :formula

  • :time

  • :datetime



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# File 'lib/roo/excel.rb', line 175

def celltype(row,col,sheet=nil)
  sheet = @default_sheet unless sheet
   unless @cells_read[sheet] or (@read_first_100_rows[sheet] and row < 100)
      read_cells(sheet) 
  end
  row,col = normalize(row,col)
  begin
    if @formula[sheet][[row,col]]
      return :formula
    else
      @cell_type[sheet][[row,col]]
    end
  rescue
    puts "Error in sheet #{sheet}, row #{row}, col #{col}"
    raise
  end
end

#first_row(sheet = nil) ⇒ Object



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# File 'lib/roo/excel.rb', line 239

def first_row(sheet=nil)
  if sheet == nil
    sheet = @default_sheet
  end
  read_first_100_rows(sheet) unless @read_first_100_rows[sheet] or @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

#font(row, col, sheet = nil) ⇒ Object

Given a cell, return the cell’s font



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# File 'lib/roo/excel.rb', line 209

def font(row, col, sheet=nil)
  sheet = @default_sheet unless sheet
  read_cells(sheet) unless @cells_read[sheet]
  row,col = normalize(row,col)
  @fonts[sheet][[row,col]]
end

#formula(row, col, sheet = nil) ⇒ Object

returns NO formula in excel spreadsheets

Raises:



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# File 'lib/roo/excel.rb', line 194

def formula(row,col,sheet=nil)
  raise EXCEL_NO_FORMULAS
end

#formula?(row, col, sheet = nil) ⇒ Boolean

raises an exception because formulas are not supported for excel files

Returns:

  • (Boolean)

Raises:



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# File 'lib/roo/excel.rb', line 199

def formula?(row,col,sheet=nil)
  raise EXCEL_NO_FORMULAS
end

#formulas(sheet = nil) ⇒ Object

returns NO formulas in excel spreadsheets

Raises:



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# File 'lib/roo/excel.rb', line 204

def formulas(sheet=nil)
  raise EXCEL_NO_FORMULAS
end

#label(labelname, sheet = nil) ⇒ Object

(nil,nil) if label is not defined sheet parameter is not really needed because label names are global to the whole spreadsheet



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# File 'lib/roo/excel.rb', line 228

def label(labelname,sheet=nil)
  sheet = @default_sheet unless sheet
  read_cells(sheet) unless @cells_read[sheet]
  if @labels.has_key? labelname
    return @labels[labelname][1].to_i,
      GenericSpreadsheet.letter_to_number(@labels[labelname][2]),
      @labels[labelname][0]
  else
    return nil,nil,nil
  end
end

#sheetsObject

returns an array of sheet names in the spreadsheet



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# File 'lib/roo/excel.rb', line 138

def sheets
  result = []
  @workbook.worksheets.each do |worksheet| 
    result << normalize_string(worksheet.name)
  end
  return result
end

#to_s(sheet = nil) ⇒ Object

shows the internal representation of all cells mainly for debugging purposes



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# File 'lib/roo/excel.rb', line 218

def to_s(sheet=nil)
  sheet = @default_sheet unless sheet
  read_cells(sheet) unless @cells_read[sheet]
  @cell[sheet].inspect
end