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#
# Methods which edit the graph components without traversal
#
module RGFATools::Multiplication
# Allowed values for the links_distribution_policy option
LINKS_DISTRIBUTION_POLICY = [:off, :auto, :equal, :E, :B]
# @overload multiply(segment, factor, copy_names: :lowcase, distribute: :auto, conserve_components: true, origin_tag: :or)
# Create multiple copies of a segment.
#
# Complements the multiply method of gfatools with additional functionality.
# These extensions are used only after #enable_extensions is called on the
# RGFA object. After that, you may still call the original method
# using #multiply_without_rgfatools.
#
# For more information on the additional functionality, see
# #multiply_extended.
#
# @return [RGFA] self
def multiply_with_rgfatools(segment, factor,
copy_names: :lowcase,
distribute: :auto,
conserve_components: true,
origin_tag: :or)
if !@extensions_enabled
return multiply_without_rgfatools(segment, factor,
copy_names: copy_names,
conserve_components: conserve_components)
else
multiply_extended(segment, factor,
copy_names: copy_names,
distribute: distribute,
conserve_components: conserve_components,
origin_tag: origin_tag)
end
end
# Create multiple copies of a segment.
#
# Complements the multiply method of gfatools with additional functionality.
# To always run the additional functionality when multiply is called,
# use RGFA#enable_extensions.
#
# @!macro [new] copynames_text
#
# <b>Automatic computation of the copy names:</b>
#
# - First, itis checked if the name of the original segment ends with a
# relevant
# string, i.e. a lower case letter (for +:lowcase+), an upper case letter
# (for +:upcase+), a digit (for +:number+), or the string +"_copy"+
# plus one or more optional digits (for +:copy+).
# - If so, it is assumed, it was already a copy, and it is not
# altered.
# - If not, then +a+ (for +:lowcase+), +A+ (for +:upcase+), +1+ (for
# +:number+), +_copy+ (for +:copy+) is appended to the string.
# - Then, in all
# cases, next (*) is called on the string, until a valid, non-existant
# name is found for each of the segment copies
# - (*) = except for +:copy+, where
# for the first copy no digit is present, but for the following is,
# i.e. the segment names will be +:copy+, +:copy2+, +:copy3+, etc.
# - Can be overridden, by providing an array of copy names.
#
# @!macro [new] ldp_text
#
# <b>Links distribution policy</b>
#
# Depending on the value of the option +distribute+, an end
# is eventually selected for distribution of the links.
#
# - +:off+: no distribution performed
# - +:E+: links of the E end are distributed
# - +:B+: links of the B end are distributed
# - +:equal+: select an end for which the number of links is equal to
# +factor+, if any; if both, then the E end is selected
# - +:auto+: automatically select E or B, trying to maximize the number of
# links which can be deleted
#
# @param [Integer] factor multiplication factor; if 0, delete the segment;
# if 1; do nothing; if > 1; number of copies to create
# @!macro [new] segment_param
# @param segment [String, RGFA::Line::Segment] segment name or instance
# @param [:lowcase, :upcase, :number, :copy, Array<String>] copy_names
# <i>(Defaults to: +:lowcase+)</i>
# Array of names for the copies of the segment,
# or a symbol, which defines a system to compute the names from the name of
# the original segment. See "Automatic computation of the copy names".
# @!macro [new] conserve_components
# @param [Boolean] conserve_components <i>(Defaults to: +true+)</i>
# If factor == 0 (i.e. deletion), delete segment only if
# #cut_segment?(segment) is +false+ (see RGFA API).
# @!macro [new] ldp_param
# @param distribute
# [RGFATools::Multiplication::LINKS_DISTRIBUTION_POLICY]
# <i>(Defaults to: +:auto+)</i>
# Determines if and for which end of the segment, links are distributed
# among the copies. See "Links distribution policy".
# @!macro [new] origin_tag
# @param origin_tag [Symbol] <i>(Defaults to: +:or+)</i>
# Name of the custom tag to use for storing origin information.
#
# @return [RGFA] self
def multiply_extended(segment, factor,
copy_names: :lowcase,
distribute: :auto,
conserve_components: true,
origin_tag: :or)
s, sn = segment_and_segment_name(segment)
s.set(origin_tag, sn) if !s.get(origin_tag)
copy_names = compute_copy_names(copy_names, sn, factor)
multiply_without_rgfatools(sn, factor,
copy_names: copy_names,
conserve_components: conserve_components)
distribute_links(distribute, sn, copy_names, factor)
return self
end
private
Redefined = [:multiply]
def select_distribute_end(links_distribution_policy, segment_name, factor)
accepted = RGFATools::Multiplication::LINKS_DISTRIBUTION_POLICY
if !accepted.include?(links_distribution_policy)
raise "Unknown links distribution policy #{links_distribution_policy}, "+
"accepted values are: "+
accepted.inspect
end
return nil if links_distribution_policy == :off
if [:B, :E].include?(links_distribution_policy)
return links_distribution_policy
end
esize = links_of([segment_name, :E]).size
bsize = links_of([segment_name, :B]).size
auto_select_distribute_end(factor, bsize, esize,
links_distribution_policy == :equal)
end
# (keep separate for testing)
def auto_select_distribute_end(factor, bsize, esize, equal_only)
if esize == factor
return :E
elsif bsize == factor
return :B
elsif equal_only
return nil
elsif esize < 2
return (bsize < 2) ? nil : :B
elsif bsize < 2
return :E
elsif esize < factor
return ((bsize <= esize) ? :E :
((bsize < factor) ? :B : :E))
elsif bsize < factor
return :B
else
return ((bsize <= esize) ? :B : :E)
end
end
def distribute_links(links_distribution_policy, segment_name,
copy_names, factor)
return if factor < 2
end_type = select_distribute_end(links_distribution_policy,
segment_name, factor)
return nil if end_type.nil?
et_links = links_of([segment_name, end_type])
diff = [et_links.size - factor, 0].max
links_signatures = et_links.map do |l|
l.other_end([segment_name, end_type]).join
end
([segment_name]+copy_names).each_with_index do |sn, i|
links_of([sn, end_type]).each do |l|
l_sig = l.other_end([sn, end_type]).join
to_save = links_signatures[i..i+diff].to_a
delete_link(l) unless to_save.include?(l_sig)
end
end
end
def segment_and_segment_name(segment_or_segment_name)
if segment_or_segment_name.kind_of?(RGFA::Line)
s = segment_or_segment_name
sn = segment_or_segment_name.name
else
sn = segment_or_segment_name.to_sym
s = segment(sn)
end
return s, sn
end
end
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