Class: IOStreams::Tabular::Parser::Fixed::Column

Inherits:
Object
  • Object
show all
Defined in:
lib/io_streams/tabular/parser/fixed.rb

Constant Summary collapse

TYPES = 
%i[string integer float].freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(key: nil, size:, type: :string, decimals: 2) ⇒ Column

Returns a new instance of Column.

Raises:



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# File 'lib/io_streams/tabular/parser/fixed.rb', line 149

def initialize(key: nil, size:, type: :string, decimals: 2)
  @key      = key
  @size     = size == :remainder ? -1 : size.to_i
  @type     = type.to_sym
  @decimals = decimals

  unless @size.positive? || (@size == -1)
    raise(Errors::InvalidLayout, "Size #{size.inspect} must be positive or :remainder")
  end
  raise(Errors::InvalidLayout, "Unknown type: #{type.inspect}") unless TYPES.include?(type)
end

Instance Attribute Details

#decimals ⇒ Object (readonly)

Returns the value of attribute decimals.



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# File 'lib/io_streams/tabular/parser/fixed.rb', line 147

def decimals
  @decimals
end

#key ⇒ Object (readonly)

Returns the value of attribute key.



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# File 'lib/io_streams/tabular/parser/fixed.rb', line 147

def key
  @key
end

#size ⇒ Object (readonly)

Returns the value of attribute size.



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# File 'lib/io_streams/tabular/parser/fixed.rb', line 147

def size
  @size
end

#type ⇒ Object (readonly)

Returns the value of attribute type.



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# File 'lib/io_streams/tabular/parser/fixed.rb', line 147

def type
  @type
end

Instance Method Details

#parse(value) ⇒ Object 



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# File 'lib/io_streams/tabular/parser/fixed.rb', line 161

def parse(value)
  return if value.nil?

  stripped_value = value.to_s.strip

  case type
  when :string
    stripped_value
  when :integer
    stripped_value.length.zero? ? nil : value.to_i
  when :float
    stripped_value.length.zero? ? nil : value.to_f
  else
    raise(Errors::InvalidLayout, "Unsupported type: #{type.inspect}")
  end
end

#render(value, truncate) ⇒ Object 



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# File 'lib/io_streams/tabular/parser/fixed.rb', line 178

def render(value, truncate)
  formatted =
    case type
    when :string
      value = value.to_s
      return value if size == -1

      format(truncate ? "%-#{size}.#{size}s" : "%-#{size}s", value)
    when :integer
      return value.to_i.to_s if size == -1

      truncate = false
      format("%0#{size}d", value.to_i)
    when :float
      return value.to_f.to_s if size == -1

      truncate = false
      format("%0#{size}.#{decimals}f", value.to_f)
    else
      raise(Errors::InvalidLayout, "Unsupported type: #{type.inspect}")
    end

  if !truncate && formatted.length > size
    raise(Errors::ValueTooLong, "Value: #{value} is too large to fit into column:#{key} of size:#{size}")
  end

  formatted
end