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module Gitlab
module Diff
class DiffRefs
attr_reader :base_sha
attr_reader :start_sha
attr_reader :head_sha
def initialize(base_sha:, start_sha: base_sha, head_sha:)
@base_sha = base_sha
@start_sha = start_sha
@head_sha = head_sha
end
def ==(other)
other.is_a?(self.class) &&
base_sha == other.base_sha &&
start_sha == other.start_sha &&
head_sha == other.head_sha
end
# There is only one case in which we will have `start_sha` and `head_sha`,
# but not `base_sha`, which is when a diff is generated between an
# orphaned branch and another branch, which means there _is_ no base, but
# we're still able to highlight it, and to create diff notes, which are
# the primary things `DiffRefs` are used for.
# `DiffRefs` are "complete" when they have `start_sha` and `head_sha`,
# because `base_sha` can always be derived from this, to return an actual
# sha, or `nil`.
# We have `base_sha` directly available on `DiffRefs` because it's faster#
# than having to look it up in the repo every time.
def complete?
start_sha && head_sha
end
end
end
end
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