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Contents
require 'marc/spec/queries/position_or_range'
module MARC
module Spec
module Queries
class Position
include PositionOrRange
# ------------------------------------------------------------
# Attributes
attr_reader :position
def initialize(position)
@position = int_or_nil(position)
end
# ------------------------------------------------------------
# Instance methods
# @overload select_from(seq)
# Selects the value at the specified position and returns it as a
# single-element array, for compatibility with AlNumRange
# @param seq [Array] the input array
# @return [Array] a single-element array containing the result, or
# an empty array if the index is out of bounds
# @overload select_from(seq)
# Selects the character at the specified position
# @param seq [String] the input array
# @return [String, nil] a single-element array, or nil if the index
# is out of bounds
def select_from(seq)
# we use raw_result[-1] instead of raw_result.last b/c seq might be a string
raw_result = seq[position.nil? ? -1 : position]
seq.is_a?(String) ? wrap_string_result(raw_result) : wrap_array_result(raw_result)
end
# ------------------------------------------------------------
# Object overrides
def to_s
(position || '#').to_s
end
# ------------------------------------------------------------
# Protected methods
protected
# ------------------------------
# Part
def equality_attrs
[:position]
end
end
end
end
end
Version data entries
4 entries across 4 versions & 1 rubygems