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Clean up parser ItemSet processing

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This commit is contained in:
Josh Holtrop 2022-06-14 22:57:07 -04:00
parent 0f1c00d1a6
commit a91bf2f250
1 changed files with 11 additions and 14 deletions
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25
lib/propane/parser.rb
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@ -8,22 +8,19 @@ class Propane
@item_sets = []
@item_sets_set = {}
start_item = Item.new(start_rule, 0)
eval_item_sets = Set.new
eval_item_sets << ItemSet.new([start_item])
eval_item_sets = Set[ItemSet.new([start_item])]
while eval_item_sets.size > 0
this_eval_item_sets = eval_item_sets
eval_item_sets = Set.new
this_eval_item_sets.each do |item_set|
unless @item_sets_set.include?(item_set)
item_set.id = @item_sets.size
@item_sets << item_set
@item_sets_set[item_set] = item_set
item_set.following_symbols.each do |following_symbol|
unless following_symbol == @eof_token
following_set = item_set.build_following_item_set(following_symbol)
eval_item_sets << following_set
end
item_set = eval_item_sets.first
eval_item_sets.delete(item_set)
unless @item_sets_set.include?(item_set)
item_set.id = @item_sets.size
@item_sets << item_set
@item_sets_set[item_set] = item_set
item_set.following_symbols.each do |following_symbol|
unless following_symbol == @eof_token
following_set = item_set.build_following_item_set(following_symbol)
eval_item_sets << following_set
end
end
end