EditOp

Encodes edit operations necessary to transform one sequence into another. Given sequences s (source) and t (target), a sequence of EditOp encodes the steps that need to be taken to convert s into t. For example, if s = "cat" and "cars", the minimal sequence that transforms s into t is: skip two characters, replace 't' with 'r', and insert an 's'. Working with edit operations is useful in applications such as spell-checkers (to find the closest word to a given misspelled word), approximate searches, diff-style programs that compute the difference between files, efficient encoding of patches, DNA sequence analysis, and plagiarism detection.

Values

Value	Meaning
none`'n'`	Current items are equal; no editing is necessary.
substitute`'s'`	Substitute current item in target with current item in source.
insert`'i'`	Insert current item from the source into the target.
remove`'r'`	Remove current item from the target.

Examples

with(EditOp)
{
    assert(levenshteinDistanceAndPath("foo", "foobar")[1] == [none, none, none, insert, insert, insert]);
    assert(levenshteinDistanceAndPath("banana", "fazan")[1] == [substitute, none, substitute, none, none, remove]);
}

The OpenD Programming Language

EditOp

Values

Examples

Meta

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