Class: SitemapGenerator::BigDecimal

Inherits:
Object
  • Object
show all
Defined in:
lib/sitemap_generator/core_ext/big_decimal.rb

Overview

Scoped BigDecimal wrapper that serializes to YAML without scientific notation. Defined here rather than reopening the global BigDecimal class.

Constant Summary collapse

YAML_TAG = 
'tag:yaml.org,2002:float'
YAML_MAPPING = 
{ 'Infinity' => '.Inf', '-Infinity' => '-.Inf', 'NaN' => '.NaN' }.freeze
DEFAULT_STRING_FORMAT = 
'F'

Instance Method Summary collapse

Constructor Details

#initialize(num) ⇒ BigDecimal

Returns a new instance of BigDecimal.



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# File 'lib/sitemap_generator/core_ext/big_decimal.rb', line 23

def initialize(num)
  @value = BigDecimal(num)
end

Instance Method Details

#*(other) ⇒ Object 



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# File 'lib/sitemap_generator/core_ext/big_decimal.rb', line 27

def *(other)
  other * @value
end

#/(other) ⇒ Object 



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# File 'lib/sitemap_generator/core_ext/big_decimal.rb', line 31

def /(other)
  other.is_a?(SitemapGenerator::BigDecimal) ? @value / other.instance_variable_get(:@value) : @value / other
end

#encode_with(coder) ⇒ Object 



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# File 'lib/sitemap_generator/core_ext/big_decimal.rb', line 48

def encode_with(coder)
  string = to_s
  coder.represent_scalar(nil, YAML_MAPPING[string] || string)
end

#to_d ⇒ Object 



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# File 'lib/sitemap_generator/core_ext/big_decimal.rb', line 53

def to_d
  self
end

#to_s(format = DEFAULT_STRING_FORMAT) ⇒ Object 



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# File 'lib/sitemap_generator/core_ext/big_decimal.rb', line 58

def to_s(format = DEFAULT_STRING_FORMAT)
  @value.to_s(format)
end

#to_yaml(opts = {}) ⇒ Object

This emits the number without any scientific notation. This is better than self.to_f.to_s since it doesn't lose precision.

Note that reconstituting YAML floats to native floats may lose precision.



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# File 'lib/sitemap_generator/core_ext/big_decimal.rb', line 39

def to_yaml(opts = {})
  return super unless defined?(YAML::ENGINE) && YAML::ENGINE.syck?

  YAML.quick_emit(nil, opts) do |out|
    string = to_s
    out.scalar(YAML_TAG, YAML_MAPPING[string] || string, :plain)
  end
end