14 Jul 2011
Diff is a Fantom library to find differences between two sequences of objects of any type (e.g. strings, text files line-by-line, etc). As a pure Fantom library, it can be compiled into Java or JavaScript.
Based on the C# library by Matthias Hertel.
Find differences between simple strings:
using diff
class DiffExample
{
static Void main(Str[] args) {
echo("*** Strings from wiki page (http://en.wikipedia.org/wiki/Diff) ***")
sa := "abcdfghjqz"
sb := "abcdefgijkrxyz"
echo("String A: $sa")
echo("String B: $sb")
echo(Diff.run(sa, sb))
echo("\n*** List of numbers ***")
la := [1, 2, 3, 4]
lb := [3, 4, 1, 2]
echo("List A: $la")
echo("List B: $lb")
echo(Diff.run(la, lb))
echo("\n*** Example, when setting minimal flag results in shorter deltas ***")
echo(" (setting minimal flag may decrease performance dramatically)")
ma := "aa"
mb := "ba"
echo("String A: $ma")
echo("String B: $mb")
echo("Without minimal flag set: " + Diff.run(ma, mb))
echo("With minimal flag set: " + Diff.run(ma, mb, true))
}
}File differences between text files:
using diff
class FileExample
{
static Void main(Str[] args) {
if (2 > args.size) {
echo("Compares two files line by line")
echo("Usage: fan FileDiff.fan <file A> <file B>")
return
}
inA := File(`${args[0]}`).in
inB := File(`${args[1]}`).in
deltas := Diff.run(inA, inB)
deltas.each { echo("$it.a => $it.b") }
}
}