Method: Diff::LCS.__normalize_patchset

Defined in:
lib/gems/diff-lcs-1.1.2/lib/diff/lcs.rb

.__normalize_patchset(patchset) ⇒ Object

Normalize the patchset. A patchset is always a sequence of changes, but how those changes are represented may vary, depending on how they were generated. In all cases we support, we also support the array representation of the changes. The formats are:

[ # patchset <- Diff::LCS.diff(a, b)
  [ # one or more hunks
    Diff::LCS::Change # one or more changes
  ] ]

[ # patchset, equivalent to the above
  [ # one or more hunks
    [ action, line, value ] # one or more changes
  ] ]

[ # patchset <- Diff::LCS.diff(a, b, Diff::LCS::ContextDiffCallbacks)
  #       OR <- Diff::LCS.sdiff(a, b, Diff::LCS::ContextDiffCallbacks)
  [ # one or more hunks
    Diff::LCS::ContextChange # one or more changes
  ] ]

[ # patchset, equivalent to the above
  [ # one or more hunks
    [ action, [ old line, old value ], [ new line, new value ] ]
      # one or more changes
  ] ]

[ # patchset <- Diff::LCS.sdiff(a, b)
  #       OR <- Diff::LCS.diff(a, b, Diff::LCS::SDiffCallbacks)
  Diff::LCS::ContextChange # one or more changes
]

[ # patchset, equivalent to the above
  [ action, [ old line, old value ], [ new line, new value ] ]
    # one or more changes
]

The result of this will be either of the following.

[ # patchset
  Diff::LCS::ContextChange # one or more changes
]

[ # patchset
  Diff::LCS::Change # one or more changes
]

If either of the above is provided, it will be returned as such.



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# File 'lib/gems/diff-lcs-1.1.2/lib/diff/lcs.rb', line 1075

def __normalize_patchset(patchset)
  patchset.map do |hunk|
    case hunk
    when Diff::LCS::ContextChange, Diff::LCS::Change
      hunk
    when Array
      if (not hunk[0].kind_of?(Array)) and hunk[1].kind_of?(Array) and hunk[2].kind_of?(Array)
        Diff::LCS::ContextChange.from_a(hunk)
      else
        hunk.map do |change|
          case change
          when Diff::LCS::ContextChange, Diff::LCS::Change
            change
          when Array
              # change[1] will ONLY be an array in a ContextChange#to_a call.
              # In Change#to_a, it represents the line (singular).
            if change[1].kind_of?(Array)
              Diff::LCS::ContextChange.from_a(change)
            else
              Diff::LCS::Change.from_a(change)
            end
          end
        end
      end
    else
      raise ArgumentError, "Cannot normalise a hunk of class #{hunk.class}."
    end
  end.flatten
end