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# frozen_string_literal: true
module Lumberjack
class Formatter
# This formatter can be used to multiply a numeric value by a specified multiplier and
# optionally round to a specified number of decimal places.
#
# This is useful for unit conversions (e.g., converting seconds to milliseconds)
# or scaling values for display purposes. Non-numeric values are passed through unchanged.
class MultiplyFormatter
FormatterRegistry.add(:multiply, self)
# @param multiplier [Numeric] The multiplier to apply to the value.
# @param decimals [Integer, nil] The number of decimal places to round the result to.
# If nil, no rounding is applied.
def initialize(multiplier, decimals = nil)
@multiplier = multiplier
@decimals = decimals
end
# Multiply a numeric value by the configured multiplier and optionally round.
#
# @param value [Object] The value to format. Only numeric values are processed.
# @return [Numeric, Object] The multiplied (and optionally rounded) value if numeric,
# otherwise returns the original value unchanged.
def call(value)
return value unless value.is_a?(Numeric)
value *= @multiplier
value = value.round(@decimals) if @decimals
value
end
end
end
end
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