Class: FakedCSV::Generator

Inherits:
Object
  • Object
show all
Defined in:
lib/faked_csv/generator.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config) ⇒ Generator

Returns a new instance of Generator.



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# File 'lib/faked_csv/generator.rb', line 5

def initialize(config)
    @config = config
end

Instance Attribute Details

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/faked_csv/generator.rb', line 3

def config
  @config
end

#rows ⇒ Object (readonly)

Returns the value of attribute rows.



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# File 'lib/faked_csv/generator.rb', line 3

def rows
  @rows
end

Class Method Details

.fake(type) ⇒ Object 



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# File 'lib/faked_csv/generator.rb', line 235

def self.fake(type)
    Fakerer.new(type).fake
end

.rand_char(length) ⇒ Object

individual random generators



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# File 'lib/faked_csv/generator.rb', line 185

def self.rand_char(length)
    o = [('a'..'z'), ('A'..'Z'), (0..9)].map { |i| i.to_a }.flatten
    string = (0...length).map { o[rand(o.length)] }.join
end

.rand_float(min, max, precision) ⇒ Object 



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# File 'lib/faked_csv/generator.rb', line 230

def self.rand_float(min, max, precision)
    raise "min > max" if min > max
    (rand * (max - min) + min).round(precision)
end

.rand_formatted_char(format) ⇒ Object 



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# File 'lib/faked_csv/generator.rb', line 190

def self.rand_formatted_char(format)
    res = []
    i = 0
    while i < format.size
        case a = format[i]
        when '/'
            i += 1
            res << single_rand_char(format[i])
        else
            res << a
        end
        i += 1
    end
    return res.join("")
end

.rand_int(min, max) ⇒ Object 



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# File 'lib/faked_csv/generator.rb', line 225

def self.rand_int(min, max)
    raise "min > max" if min > max
    min + rand(max - min + 1)
end

.single_rand_char(format) ⇒ Object 



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# File 'lib/faked_csv/generator.rb', line 206

def self.single_rand_char(format)
    aa = nil
    case format
    when 'W' # A-Z
        aa = ('A'..'Z').to_a
    when 'w' # a-z
        aa = ('a'..'z').to_a
    when 'd' # 0-9
        aa = (0..9).to_a
    when 'D' # A-Za-z
        aa = [('a'..'z'), ('A'..'Z')].map { |i| i.to_a }.flatten
    when '@'
        aa = [('a'..'z'), ('A'..'Z'), (0..9)].map { |i| i.to_a }.flatten
    else
        raise "invalid format: #{format} in single_rand_char"
    end
    return aa[rand(aa.size)]
end

Instance Method Details

#_loop ⇒ Object 



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# File 'lib/faked_csv/generator.rb', line 173

def _loop
    max_attempts = 1000_000_000_000
    i = 0
    (0...max_attempts).each do |j|
        yield
        i += 1
    end
    raise "max attempts reached" if i == max_attempts
end

#_random_distribution(total, parts) ⇒ Object 



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# File 'lib/faked_csv/generator.rb', line 115

def _random_distribution(total, parts)
    raise "parts has to be greater than 0" unless parts > 0
    raise "parts should not be greater than total" if total < parts
    cuts = {}
    _loop do
        break if cuts.size == parts - 1
        cuts[rand(total - 1)] = true
    end
    arr = []
    part_index = 0
    (0...total).each do |i|
        arr << part_index
        part_index += 1 if cuts.has_key? i
    end
    arr.shuffle.each_with_index do |v, i|
        yield(i, v)
    end
end

#_random_inject(values, injects) ⇒ Object

inject <injects> into <values>



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# File 'lib/faked_csv/generator.rb', line 135

def _random_inject(values, injects)
    used_indexes = {}
    count = injects.size > values.size ? values.size : injects.size
    (0...count).each do |i|
        inj = injects[i]
        times_inject = rand(values.size / injects.size / 10)
        times_inject = 1 if times_inject < 1
        times_inject.times do
            rand_index = rand(values.size)
            _loop do
                break unless used_indexes.has_key? rand_index
                rand_index = rand(values.size)
            end
            used_indexes[rand_index] = true
            values[rand_index] = inj
        end
    end
end

#_random_value(field) ⇒ Object 



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# File 'lib/faked_csv/generator.rb', line 154

def _random_value(field)
    case field[:type]
    when :rand_int
        return Generator.rand_int field[:min], field[:max]
    when :rand_float
        return Generator.rand_float field[:min], field[:max], field[:precision]
    when :rand_char
        if field[:format].nil?
            return Generator.rand_char field[:length]
        else
            return Generator.rand_formatted_char field[:format]
        end
    when :fixed
        return field[:values].sample
    else # faker
        return Generator.fake field[:type]
    end
end

#generate ⇒ Object 



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# File 'lib/faked_csv/generator.rb', line 37

def generate
    puts "preparing values ..."
    prepare_values

    @config.fields.each do |field|
        puts "generating random data for #{field} ..."
        field[:data] = []

        # let's get some data!
        if field[:type] == :inc_int
            puts "generating increment values ..."
            i = field[:start]
            @config.row_count.times do
                field[:data] << i
                i += field[:step]
            end
        elsif field[:rotate].nil? || field[:type] == :fixed
            # not rotating? or fixed values? generate random value each time
            puts "calling generator ..."
            index = 0
            @config.row_count.times do
                field[:data] << _random_value(field)
                print '.' if index % 10000 == 0
                index += 1
            end
            puts

            # inject user values if given and not fixed type
            puts "injecting values ..."
            unless field[:type] == :fixed || field[:inject].nil?
                _random_inject(field[:data], field[:inject])
            end
        else
            # rotating? pick from prepared values
            puts "selecting data from rotation ..."
            _random_distribution(@config.row_count, field[:values].size) do |i, j|
                field[:data][i] = field[:values][j]
            end
        end
    end
end

#headers ⇒ Object 



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# File 'lib/faked_csv/generator.rb', line 9

def headers
    @config.headers
end

#prepare_values ⇒ Object 



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# File 'lib/faked_csv/generator.rb', line 79

def prepare_values
    @config.fields.each do |field|
        puts "prepare value for #{field} ..."
        # if it's fixed values or no rotate
        # we don't want to prepare values for this field
        if [:inc_int, :fixed].include?(field[:type]) || field[:rotate].nil?
            next
        end

        # we don't have enough integers for the rotate
        if field[:type] == :rand_int && field[:rotate] > field[:max] - field[:min] + 1
            raise "rotate should not be greater than the size of the range"
        end

        values = {}
        # let's first inject all user values if given
        puts "injecting user values ..."
        unless field[:inject].nil?
            field[:inject].each do |inj|
                values[inj] = true
                # truncate more inject values if we go over the rows count
                break if values.size == @config.row_count
            end
        end
        # then generate as many data as we need
        puts "looping to get enough values ..."
        _loop do
            # we want to get <rotate> unique values. stop when we got enough
            break if values.size >= field[:rotate]
            v = _random_value(field)
            values[v] = true
        end
        field[:values] = values.keys
    end
end

#print_to(writer) ⇒ Object 



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# File 'lib/faked_csv/generator.rb', line 27

def print_to(writer)
    (0...@config.row_count).each do |r|
        @config.fields.each_with_index do |field, index|
            suffix = (index == (@config.fields.size - 1)) ? '' : ','
            writer.write("#{field[:data][r]}#{suffix}")
        end
        writer.write("\n")
    end
end