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# frozen_string_literal: true
# typed: strict
# A block is an operation removing, adding, or changing a group of items.
# Basically, this is just a list of changes, where each change adds or
# deletes a single item. Used by bin/ldiff.
class Diff::LCS::Block
extend T::Sig
ArrayOfChange = T.type_alias { T::Array[Diff::LCS::Change] }
# The full set of changes in the block.
sig { returns(ArrayOfChange) }
attr_reader :changes
# The insertions in the block.
sig { returns(ArrayOfChange) }
attr_reader :insert
# The deletions in the block.
sig { returns(ArrayOfChange) }
attr_reader :remove
sig { params(chunk: ArrayOfChange).void }
def initialize(chunk)
@changes = T.let([], ArrayOfChange)
@insert = T.let([], ArrayOfChange)
@remove = T.let([], ArrayOfChange)
chunk.each do |item|
@changes << item
@remove << item if item.deleting?
@insert << item if item.adding?
end
end
sig { returns(Integer) }
def diff_size
insert.size - remove.size
end
sig { returns(String) }
def op
case [remove.empty?, insert.empty?]
when [false, false]
'!'
when [false, true]
'-'
when [true, false]
'+'
else # [true, true]
'^'
end
end
end
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