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September 2017 Update

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Ingy döt Net 2017-09-23 10:01:46 +02:00
parent bba7bfd280
commit ba8067c3b7
14570 changed files with 153136 additions and 63871 deletions
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16
Task/LZW-compression/Groovy/lzw-compression-1.groovy
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@ -1,5 +1,5 @@
def compress = { text ->
def dictionary = (1..255).inject([:]) { map, ch -> map."${(char)ch}" = ch; map }
def dictionary = (0..<256).inject([:]) { map, ch -> map."${(char)ch}" = ch; map }
def w = '', compressed = []
text.each { ch ->
def wc = "$w$ch"
@ -7,7 +7,7 @@ def compress = { text ->
w = wc
} else {
compressed << dictionary[w]
dictionary[wc] = dictionary.size() + 1
dictionary[wc] = dictionary.size()
w = "$ch"
}
}
@ -16,18 +16,22 @@ def compress = { text ->
}
def decompress = { compressed ->
def dictionary = (1..255).inject([:]) { map, ch -> map[ch] = "${(char)ch}"; map }
String w = "${(char)compressed.remove(0)}"
def dictionary = (0..<256).inject([:]) { map, ch -> map[ch] = "${(char)ch}"; map }
int dictSize = 128;
String w = "${(char)compressed[0]}"
StringBuffer result = new StringBuffer(w)
compressed.each { k ->
compressed.drop(1).each { k ->
String entry = dictionary[k]
if (!entry) {
if (k != dictionary.size()) throw new IllegalArgumentException("Bad compressed k $k")
entry = "$w${w[0]}"
}
result << entry
dictionary[dictionary.size() + 1] = "$w${entry[0]}"
dictionary[dictionary.size()] = "$w${entry[0]}"
w = entry
}
result.toString()
}