79 lines
2.1 KiB
Ruby
79 lines
2.1 KiB
Ruby
# frozen_string_literal: true
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class CSV
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class FieldsConverter
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include Enumerable
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def initialize(options={})
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@converters = []
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@nil_value = options[:nil_value]
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@empty_value = options[:empty_value]
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@empty_value_is_empty_string = (@empty_value == "")
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@accept_nil = options[:accept_nil]
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@builtin_converters = options[:builtin_converters]
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@need_static_convert = need_static_convert?
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end
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def add_converter(name=nil, &converter)
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if name.nil? # custom converter
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@converters << converter
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else # named converter
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combo = @builtin_converters[name]
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case combo
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when Array # combo converter
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combo.each do |sub_name|
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add_converter(sub_name)
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end
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else # individual named converter
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@converters << combo
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end
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end
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end
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def each(&block)
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@converters.each(&block)
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end
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def empty?
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@converters.empty?
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end
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def convert(fields, headers, lineno)
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return fields unless need_convert?
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fields.collect.with_index do |field, index|
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if field.nil?
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field = @nil_value
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elsif field.empty?
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field = @empty_value unless @empty_value_is_empty_string
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end
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@converters.each do |converter|
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break if field.nil? and @accept_nil
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if converter.arity == 1 # straight field converter
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field = converter[field]
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else # FieldInfo converter
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if headers
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header = headers[index]
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else
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header = nil
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end
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field = converter[field, FieldInfo.new(index, lineno, header)]
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end
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break unless field.is_a?(String) # short-circuit pipeline for speed
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end
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field # final state of each field, converted or original
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end
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end
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private
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def need_static_convert?
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not (@nil_value.nil? and @empty_value_is_empty_string)
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end
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def need_convert?
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@need_static_convert or
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(not @converters.empty?)
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end
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end
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end
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