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 172

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 157

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 167

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

.rand_int(min, max) ⇒ Object 



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# File 'lib/faked_csv/generator.rb', line 162

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

Instance Method Details

#_loop ⇒ Object 



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# File 'lib/faked_csv/generator.rb', line 145

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 91

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 111

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 130

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
        return Generator.rand_char field[:length]
    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 26

def generate
    prepare_values

    @config.fields.each do |field|
        field[:data] = []

        # let's get some data!
        if field[:type] == :inc_int
            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
            @config.row_count.times do
                field[:data] << _random_value(field)
            end

            # inject user values if given and not fixed type
            unless field[:type] == :fixed || field[:inject].nil?
                _random_inject(field[:data], field[:inject])
            end
        else
            # rotating? pick from prepared values
            _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 58

def prepare_values
    @config.fields.each do |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
        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
        _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