Module: FastExcel

Defined in:
lib/fast_excel.rb

Defined Under Namespace

Modules: AttributeHelper, FormatExt, WorkbookExt, WorksheetExt

Constant Summary collapse

DEF_COL_WIDTH = 
8.43
XLSX_DATE_DAY =

seconds in 1 day

86400.0
XLSX_DATE_EPOCH_DIFF =

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

25569

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



73
74
75
76
77
78
79
80
81
82
83
84
 
# File 'lib/fast_excel.rb', line 73

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



40
41
42
43
44
45
46
47
48
49
 
# File 'lib/fast_excel.rb', line 40

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



52
53
54
55
56
57
58
59
60
61
 
# File 'lib/fast_excel.rb', line 52

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 = nil, constant_memory: false, default_format: nil) ⇒ Object 



6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
 
# File 'lib/fast_excel.rb', line 6

def self.open(filename = nil, constant_memory: false, default_format: nil)
  tmp_file = false
  unless filename
    require 'tmpdir'
    filename = "#{Dir.mktmpdir}/fast_excel.xslx"
    tmp_file = true
  end

  unless filename
    raise ArgumentError, "filename is required"
  end

  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
  result = Libxlsxwriter::Workbook.new(workbook)

  if default_format
    raise "default_format argument must be a hash" unless default_format.is_a?(Hash)
    result.default_format.set(default_format)
  end

  result.tmp_file = tmp_file
  result.filename = filename
  result
end

.print_ffi_obj(value) ⇒ Object 



86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
 
# File 'lib/fast_excel.rb', line 86

def self.print_ffi_obj(value)
  puts "#{value.class}"
  value.members.each do |key|
    field_val = if value[key].is_a?(FFI::Pointer) && value[key].null?
      "nil"
    elsif value[key].is_a?(FFI::StructLayout::CharArray)
      value[key].to_str.inspect
    elsif value[key].is_a?(String)
      value[key].inspect
    else
      value[key]
    end
    puts "* #{key}: #{field_val}"
  end
end