GitHub - mark-summerfield/diff-nim: Nim implementation of Python difflib's sequence matcher (original) (raw)

Nim implementation of Python difflib's sequence matcher

diff is a library for finding the differences between two sequences.

The sequences can be of lines, strings (e.g., words), characters, bytes, or of any custom “item” type so long as it implements ==and hash().

For other Nim code see http://www.qtrac.eu/sitemap.html#foss

Examples

For example, this code:

let a = ("Tulips are yellow,\nViolets are blue,\nAgar is sweet,\n" & "As are you.").split('\n') let b = ("Roses are red,\nViolets are blue,\nSugar is sweet,\n" & "And so are you.").split('\n') for span in spanSlices(a, b): case span.tag of tagReplace: for text in span.a: echo("- ", text) for text in span.b: echo("+ ", text) of tagDelete: for text in span.a: echo("- ", text) of tagInsert: for text in span.b: echo("+ ", text) of tagEqual: for text in span.a: echo("= ", text)

produces this output:

- Tulips are yellow,
+ Roses are red,
= Violets are blue,
- Agar is sweet,
- As are you.
+ Sugar is sweet,
+ And so are you.

If you need indexes rather than subsequences themselves, usespans(a, b).

To skip the same subsequences pass skipEqual = true and fortagEqual use: of tagEqual: doAssert(false).

See also tests/test.nim.

License

diff is free open source software (FOSS) licensed under the Apache License, Version 2.0.