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module Picky
class Categories
each_forward :load,
:analyze,
:to => :categories
# Gets all similar tokens and puts together the possible combinations
# for each found similar token.
#
def similar_possible_for token
tokens = similar_tokens_for token
inject_possible_for tokens
end
# Returns all possible similar tokens for the given token.
#
def similar_tokens_for token
categories.inject([]) do |result, category|
result + token.similar_tokens_for(category)
end
end
#
#
def inject_possible_for tokens
tokens.inject([]) do |result, token|
possible = possible_categories token
result + possible_for(token, possible)
end
end
# Returns possible Combinations for the token.
#
# Note: The preselected_categories param is an optimization.
# Note: Returns [] if no categories matched (will produce no result).
#
def possible_for token, preselected_categories = nil
(preselected_categories || possible_categories(token)).inject([]) do |combinations, category|
combination = token.combination_for category
combination ? combinations << combination : combinations
end
end
# This returns the possible categories for this token.
# If the user has already preselected a category for this token,
# like "artist:moby", if not just return all for the given token,
# since all are possible.
#
# Note: Once I thought this was called too often. But it is not (18.01.2011).
#
def possible_categories token
token.predefined_categories(qualifier_mapper) || categories
end
end
end