source code
// The Computer Language Benchmarks Game
// http://benchmarksgame.alioth.debian.org/
//
// regex-dna program contributed by Daniel Muellenborn
// converted from regex-dna program
import Foundation
var data = FileHandle.standardInput.readDataToEndOfFile()
var sequence = String(data: data, encoding: .utf8)!
let inputLength = data.count
let regex: (String) -> NSRegularExpression = { pattern in
return try! NSRegularExpression(pattern: pattern, options: [])
}
sequence = regex(">[^\n]*\n|\n").stringByReplacingMatches(in: sequence, options: [], range: NSRange(location: 0, length: inputLength), withTemplate: "")
let codeLength = sequence.utf8.count
let variants = [
"agggtaaa|tttaccct",
"[cgt]gggtaaa|tttaccc[acg]",
"a[act]ggtaaa|tttacc[agt]t",
"ag[act]gtaaa|tttac[agt]ct",
"agg[act]taaa|ttta[agt]cct",
"aggg[acg]aaa|ttt[cgt]ccct",
"agggt[cgt]aa|tt[acg]accct",
"agggta[cgt]a|t[acg]taccct",
"agggtaa[cgt]|[acg]ttaccct",
]
var counts = Array(repeating: ("",0), count: variants.count)
// parallelized version is slower
// let queue = DispatchQueue(label: "Queue")
// DispatchQueue.concurrentPerform(iterations: variants.count) { n in
for n in 0..<variants.count {
counts[n] = (variants[n], regex(variants[n]).numberOfMatches(in: sequence, options: [], range: NSRange(location: 0, length: codeLength)))
}
for (variant, count) in counts {
print(variant, "\(count)")
}
let replacements = [
(regex("tHa[Nt]"), "<4>"),
(regex("aND|caN|Ha[DS]|WaS"), "<3>"),
(regex("a[NSt]|BY"), "<2>"),
(regex("<[^>]*>"), "|"),
(regex("\\|[^|][^|]*\\|"), "-"),
]
for (re, replacement) in replacements {
sequence = re.stringByReplacingMatches(in: sequence, options: [], range: NSRange(location: 0, length: sequence.utf16.count), withTemplate: replacement)
}
let resultLength = sequence.utf8.count
print("", inputLength, codeLength, resultLength, separator: "\n")