Module: FastExcel

Defined in:
lib/fast_excel.rb

Defined Under Namespace

Modules: WorkbookExt, WorksheetExt

Constant Summary collapse

DEF_COL_WIDTH =

include Libxlsxwriter

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XLSX_DATE_DAY =

seconds in 1 day

86400.0
XLSX_DATE_EPOCH_DIFF =

days between 1970-jan-01 and 1900-jan-01

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Class Method Summary collapse

Class Method Details

.date_num(time, offset = nil) ⇒ Object

Convert time to number of days, and change beginning point from 1st jan 1970 to 1st jan 1900 Offset argument should be number of seconds, if not specified then it will use Time.zone.utc_offset || 0

support.microsoft.com/en-us/help/214330/differences-between-the-1900-and-the-1904-date-system-in-excel



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# File 'lib/fast_excel.rb', line 55

def self.date_num(time, offset = nil)
  unless offset
    # Try use Rails' app timezone
    if Time.respond_to?(:zone)
      offset = Time.zone.utc_offset
    else
      offset = 0 # rollback to UTC
    end
  end

  time.to_f / XLSX_DATE_DAY + XLSX_DATE_EPOCH_DIFF + offset / XLSX_DATE_DAY
end

.lxw_datetime(time) ⇒ Object

Creates internal Libxlsxwriter::Datetime from Datetime object



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# File 'lib/fast_excel.rb', line 22

def self.lxw_datetime(time)
  date = Libxlsxwriter::Datetime.new
  date[:year] = time.year
  date[:month] = time.month
  date[:day] = time.day
  date[:hour] = time.hour
  date[:min] = time.minute
  date[:sec] = time.second
  date
end

.lxw_time(time) ⇒ Object

Creates internal Libxlsxwriter::Datetime from Time object



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# File 'lib/fast_excel.rb', line 34

def self.lxw_time(time)
  date = Libxlsxwriter::Datetime.new
  date[:year] = time.year
  date[:month] = time.month
  date[:day] = time.day
  date[:hour] = time.hour
  date[:min] = time.min
  date[:sec] = time.sec
  date
end

.open(filename, constant_memory: false) ⇒ Object 



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# File 'lib/fast_excel.rb', line 8

def self.open(filename, constant_memory: false)
  filename = filename.to_s if defined?(Pathname) && filename.is_a?(Pathname)

  workbook = if constant_memory
    opt = Libxlsxwriter::WorkbookOptions.new
    opt[:constant_memory] = 1
    Libxlsxwriter.workbook_new_opt(filename, opt)
  else
    Libxlsxwriter.workbook_new(filename)
  end
  Libxlsxwriter::Workbook.new(workbook)
end