Module: Excel2CSV

Defined in:
lib/excel2csv.rb,
lib/excel2csv/info.rb,
lib/excel2csv/version.rb

Defined Under Namespace

Classes: Info

Constant Summary collapse

VERSION = 
"0.3.0"

Class Method Summary collapse

Class Method Details

.clean_options(options) ⇒ Object 



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# File 'lib/excel2csv.rb', line 112

def clean_options options
  options.dup.delete_if do |key, value|
    [:working_folder, :java_options, :preview, :sheet, :path, :rows, :info].include?(key)
  end
end

.convert(path, options = {}) ⇒ Object 



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# File 'lib/excel2csv.rb', line 26

def convert(path, options = {})
  info = options[:info]
  if info && Dir.exists?(info.working_folder)
    return block_given? ? yield(info) : info
  end
  begin
    info = create_cvs_files(path, options)
    if block_given?
      yield info
    else
      info
    end
  ensure
    info.clean if block_given? && info
  end
end

.create_cvs_files(path, options) ⇒ Object 



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# File 'lib/excel2csv.rb', line 58

def create_cvs_files(path, options)
  tmp_dir = Dir.mktmpdir
  working_folder = options[:working_folder] || tmp_dir
  limit = options[:rows]
  path = File.expand_path(path)
  if path =~ /\.csv$/
    json = {
      'generatePreviews' => !!limit,
      'perSheetRowLimitForPreviews' => limit,
      'sourceFile' => path.to_s,
      'targetDir' => working_folder
    }
    total_rows = 0
    preview_rows = []
    opts = clean_options(options)
    sheetJson = {}
    
    full_output = "1-#{total_rows}.csv"
    # Transcode file to utf-8, count total and gen preview
    CSV.open("#{working_folder}/#{full_output}", "wb") do |csv|
      CSV.foreach(path, opts) do |row| 
        if limit && total_rows <= limit
          preview_rows << row
        end
        total_rows += 1
        csv << row
      end
    end
    sheetJson['fullOutput'] = full_output
    sheetJson['rowCount'] = total_rows
    
    if limit
      preview_output = "1-#{limit}-of-#{total_rows}-preview.csv"
      sheetJson['previewOutput'] = preview_output
      CSV.open("#{working_folder}/#{preview_output}", "wb") do |csv|
        preview_rows.each {|row| csv << row}
      end
    end
    json['sheets'] = [sheetJson]
    File.open "#{working_folder}/info.json", "wb" do |f|
      f.write(JSON.generate(json))
    end
  else
    java_options = options[:java_options] || "-Dfile.encoding=utf8 -Xms512m -Xmx512m -XX:MaxPermSize=256m"
    rows_limit = limit ? "-r #{limit}" : ""
    jar_path = File.join(File.dirname(__FILE__), "excel2csv.jar")
    `java #{java_options} -jar #{jar_path} #{rows_limit} "#{path}" #{working_folder}`
  end
  
  Info.read(working_folder)
end

.foreach(path, options = {}, &block) ⇒ Object 



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# File 'lib/excel2csv.rb', line 10

def foreach(path, options = {}, &block) 
  convert(path, options) do |info|
    CSV.foreach(path_to_sheet(info, options), clean_options(options), &block)
  end 
end

.path_to_sheet(info, options = {}) ⇒ Object 



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# File 'lib/excel2csv.rb', line 45

def path_to_sheet(info, options = {})
  options.delete(:encoding) # all previews are in utf-8
  if options[:preview]
    collection = info.previews
  else
    collection = info.sheets
  end
  index = (idx = options[:sheet]) ? idx : 0
  collection[index][:path]
end

.read(path, options = {}) ⇒ Object 



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# File 'lib/excel2csv.rb', line 18

def read(path, options = {})
  convert(path, options) do |info|
    CSV.read(path_to_sheet(info, options), clean_options(options))
  end
end