Run-length encoding: Difference between revisions

=={{header|Groovy}}==

<lang groovy>def rleEncode(text) {

def encoded = new StringBuilder()

(text =~ /(([A-Z])\2*)/).each { matcher ->

encoded.append(matcher[1].size()).append(matcher[2])

}

encoded.toString()

}

def rleDecode(text) {

def decoded = new StringBuilder()

(text =~ /([0-9]+)([A-Z])/).each { matcher ->

decoded.append(matcher[2] * Integer.parseInt(matcher[1]))

}

decoded.toString()

}</lang>

Test code

<lang groovy>def text = 'WWWWWWWWWWWWBWWWWWWWWWWWWBBBWWWWWWWWWWWWWWWWWWWWWWWWBWWWWWWWWWWWWWW'

def rleEncoded = rleEncode(text)

assert rleEncoded == '12W1B12W3B24W1B14W'

assert text == rleDecode(rleEncoded)

println "Original Text: $text"

println "Encoded Text: $rleEncoded"</lang>

Output:

<pre>Original Text: WWWWWWWWWWWWBWWWWWWWWWWWWBBBWWWWWWWWWWWWWWWWWWWWWWWWBWWWWWWWWWWWWWW

Encoded Text: 12W1B12W3B24W1B14W</pre>