class

Similar::DiffOp

Inherits Reference < Object

Abstract base class for diff operations.

Instance methods

apply_to_hook(d : DiffHook) : Nil

Apply this operation to a diff hook.

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as_tag_tuple

Transform the op into a tuple of diff tag and ranges.

This is useful when operating on slices. The returned format is (tag, i1..i2, j1..j2):

Replace: a[i1..i2] should be replaced by b[j1..j2]
Delete: a[i1..i2] should be deleted (j1 == j2 in this case).
Insert: b[j1..j2] should be inserted at a[i1..i2] (i1 == i2 in this case).
Equal: a[i1..i2] is equal to b[j1..j2].

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empty?

Returns true if the operation is empty (both ranges empty).

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grow_left(adjust : Int32) : Nil

Grows the operation on the left.

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grow_right(adjust : Int32) : Nil

Grows the operation on the right.

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iter_changes(old, new)

Returns an iterator over the changes this operation expands to.

This method is a convenient way to automatically resolve the different ways in which a change could be encoded (insert/delete vs replace), look up the value from the appropriate slice and also handle correct index handling.

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new_range

Returns the new range.

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old_range

Returns the old range.

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shift_left(adjust : Int32) : Nil

Shifts the operation left by adjusting indices.

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shift_right(adjust : Int32) : Nil

Shifts the operation right by adjusting indices.