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Add ItemSet#leading_item_sets

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This commit is contained in:
Josh Holtrop 2022-06-14 07:34:35 -04:00
parent d6e5c4325d
commit 8b152abaa7
1 changed files with 14 additions and 2 deletions
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16
lib/propane/parser/item_set.rb
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@ -17,8 +17,8 @@ class Propane
# Maps a following symbol to its ItemSet.
attr_reader :following_item_set
# @return [Set]
# Item sets leading to this item set.
# @return [Set<ItemSet>]
# ItemSets leading to this item set.
attr_reader :in_sets
# Build an ItemSet.
@ -81,6 +81,18 @@ class Propane
self == other
end
# Set of ItemSets that lead to this ItemSet.
#
# This set includes this ItemSet.
#
# @return [Set<ItemSet>]
# Set of all ItemSets that lead up to this ItemSet.
def leading_item_sets
@in_sets.reduce(Set[self]) do |result, item_set|
result + item_set.leading_item_sets
end
end
# Represent the ItemSet as a String.
#
# @return [String]