Class: Plurimath::Formatter::NumberFormatter

Inherits:
Object
  • Object
show all
Defined in:
lib/plurimath/formatter/number_formatter.rb

Constant Summary collapse

DEFAULT_BASE = 
Numbers::Base::DEFAULT_BASE
HEX_ALPHABETS = 
"abcdef".freeze
STRING_SYMBOLS = 
{
  dot: ".",
  f: "F",
}.freeze
DEFAULT_BASE_PREFIXES = 
{
  2 => "0b",
  8 => "0o",
  10 => "",
  16 => "0x",
}.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(number, data_reader = {}) ⇒ NumberFormatter

Returns a new instance of NumberFormatter.

Raises:



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# File 'lib/plurimath/formatter/number_formatter.rb', line 21

def initialize(number, data_reader = {})
  @number = number
  @data_reader = data_reader
  @base = data_reader[:base] || DEFAULT_BASE
  raise UnsupportedBase.new(@base, DEFAULT_BASE_PREFIXES) unless DEFAULT_BASE_PREFIXES.key?(@base)

  # Handle base_prefix: if explicitly provided (even as nil), use it; otherwise use default
  @base_prefix = if data_reader.key?(:base_prefix)
                   data_reader[:base_prefix].to_s
                 else
                   DEFAULT_BASE_PREFIXES[@base]
                 end
end

Instance Attribute Details

#data_reader ⇒ Object (readonly)

Returns the value of attribute data_reader.



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# File 'lib/plurimath/formatter/number_formatter.rb', line 6

def data_reader
  @data_reader
end

#number ⇒ Object (readonly)

Returns the value of attribute number.



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# File 'lib/plurimath/formatter/number_formatter.rb', line 6

def number
  @number
end

Instance Method Details

#format(precision: nil) ⇒ Object 



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# File 'lib/plurimath/formatter/number_formatter.rb', line 35

def format(precision: nil)
  data_reader[:precision] = precision || precision_from(number)
  int, frac, integer_format, fraction_format, signif_format = *partition_tokens(number)
  # FIX FOR:
  #   NotImplementedError: String#<< not supported. Mutable String methods are not supported in Opal.
  result = []
  result << integer_format.apply(int)
  result << fraction_format.apply(frac, result, integer_format) # use formatted int for correct fraction formatting
  result = result.join
  result = signif_format.apply(result, integer_format, fraction_format)
  result = result.tr(HEX_ALPHABETS, HEX_ALPHABETS.upcase) if upcase_hex?
  result = pre_post_fixed(result) unless base_default?
  "#{prefix_symbol}#{result}"
end