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class TrieDict | |
attr_reader :dict | |
def initialize | |
@dict = {} | |
end | |
def put(str) | |
d = nil | |
str.chars.each do |c| | |
d && (d = (d[1][c] ||= [nil, {}])) || d = (@dict[c] ||= [nil, {}]) | |
end | |
d[0] = true | |
end | |
def fetch(prefix, fuzzy = 0) | |
storage = [] | |
str = "" | |
error = 0 | |
recur_fetch(prefix, fuzzy, @dict, storage, str, error) | |
storage | |
end | |
def recur_fetch(prefix, fuzzy, dict, storage, str, error) | |
dict.each do |k, vals| | |
e = error | |
if prefix[0] != k | |
e += 1 | |
next if e > fuzzy | |
end | |
s = str + k | |
storage << s if vals[0] && (prefix.size - 1) <= (fuzzy - e) | |
recur_fetch(prefix[1..-1] || "", fuzzy, vals[1], storage, s, e) | |
end | |
end | |
end | |
def bench | |
t = Time.now.to_f | |
res = nil | |
10.times{ res = yield } | |
e = Time.now.to_f - t | |
puts "Elapsed for 10 times: #{e}" | |
puts "Result: #{res}" | |
end | |
trie = TrieDict.new | |
# http://www.infochimps.com/datasets/word-list-100000-official-crossword-words-excel-readable/downloads/195488 | |
File.read("/home/petr/code/tmp/words.txt").each_line do |word| | |
trie.put(word.strip) | |
end; :ok | |
# Elapsed for 10 times: 0.0006465911865234375 | |
# Result: ["hello"] | |
bench{ trie.fetch "hello", 1 } | |
# Elapsed for 10 times: 0.013643741607666016 | |
# Result: ["cello", "hallo", "helio", "hell", "hello", "hellos", "hells", "hillo", "hollo", "hullo"] | |
bench{ trie.fetch "hello", 2 } | |
# Elapsed for 10 times: 0.08267641067504883 | |
# Result: ["bell", "belle", "bellow", "bells", "belly", "cell", "cella", "celli", "cello", "cellos", "cells", "dell", "dells", "delly", "fell", "fella", "felloe", "fellow", "fells", "felly", "hall", "hallo", "halloa", "halloo", "hallos", "hallot", "hallow", "halls", "heal", "heals", "heel", "heels", "heil", "heils", "held", "helio", "helios", "helix", "hell", "helled", "heller", "hello", "helloed", "helloes", "hellos", "hells", "helm", "helms", "helot", "help", "helps", "helve", "herl", "herls", "hill", "hillo", "hilloa", "hillos", "hills", "hilly", "holla", "hollo", "holloa", "holloo", "hollos", "hollow", "holly", "hull", "hullo", "hulloa", "hullos", "hulls", "jell", "jells", "jelly", "mell", "mellow", "mells", "sell", "selle", "sells", "tell", "tells", "telly", "well", "wells", "yell", "yellow", "yells"] | |
bench{ trie.fetch "engineer", 2 } | |
# Elapsed for 10 times: 0.04654884338378906 | |
# Result: ["engender", "engine", "engined", "engineer", "engineered", "engineers", "enginery", "engines"] | |
bench{ trie.fetch "engeneer", 1 } | |
# Elapsed for 10 times: 0.005484580993652344 | |
# Result: ["engender", "engineer"] |
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