1/*
2Redistribution and use in source and binary forms, with or without
3modification, are permitted provided that the following conditions are met:
4
5    * Redistributions of source code must retain the above copyright
6    notice, this list of conditions and the following disclaimer.
7
8    * Redistributions in binary form must reproduce the above copyright
9    notice, this list of conditions and the following disclaimer in the
10    documentation and/or other materials provided with the distribution.
11
12    * Neither the name of "The Computer Language Benchmarks Game" nor the
13    name of "The Computer Language Shootout Benchmarks" nor the names of
14    its contributors may be used to endorse or promote products derived
15    from this software without specific prior written permission.
16
17THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
21LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27POSSIBILITY OF SUCH DAMAGE.
28*/
29
30/* The Computer Language Benchmarks Game
31 * http://shootout.alioth.debian.org/
32 *
33 * contributed by The Go Authors.
34 */
35
36package main
37
38import (
39	"fmt"
40	"io/ioutil"
41	"os"
42	"regexp"
43	"runtime"
44)
45
46var variants = []string{
47	"agggtaaa|tttaccct",
48	"[cgt]gggtaaa|tttaccc[acg]",
49	"a[act]ggtaaa|tttacc[agt]t",
50	"ag[act]gtaaa|tttac[agt]ct",
51	"agg[act]taaa|ttta[agt]cct",
52	"aggg[acg]aaa|ttt[cgt]ccct",
53	"agggt[cgt]aa|tt[acg]accct",
54	"agggta[cgt]a|t[acg]taccct",
55	"agggtaa[cgt]|[acg]ttaccct",
56}
57
58type Subst struct {
59	pat, repl string
60}
61
62var substs = []Subst{
63	Subst{"B", "(c|g|t)"},
64	Subst{"D", "(a|g|t)"},
65	Subst{"H", "(a|c|t)"},
66	Subst{"K", "(g|t)"},
67	Subst{"M", "(a|c)"},
68	Subst{"N", "(a|c|g|t)"},
69	Subst{"R", "(a|g)"},
70	Subst{"S", "(c|g)"},
71	Subst{"V", "(a|c|g)"},
72	Subst{"W", "(a|t)"},
73	Subst{"Y", "(c|t)"},
74}
75
76func countMatches(pat string, bytes []byte) int {
77	re := regexp.MustCompile(pat)
78	n := 0
79	for {
80		e := re.FindIndex(bytes)
81		if e == nil {
82			break
83		}
84		n++
85		bytes = bytes[e[1]:]
86	}
87	return n
88}
89
90func main() {
91	runtime.GOMAXPROCS(4)
92	bytes, err := ioutil.ReadAll(os.Stdin)
93	if err != nil {
94		fmt.Fprintf(os.Stderr, "can't read input: %s\n", err)
95		os.Exit(2)
96	}
97	ilen := len(bytes)
98	// Delete the comment lines and newlines
99	bytes = regexp.MustCompile("(>[^\n]+)?\n").ReplaceAll(bytes, []byte{})
100	clen := len(bytes)
101
102	mresults := make([]chan int, len(variants))
103	for i, s := range variants {
104		ch := make(chan int)
105		mresults[i] = ch
106		go func(ss string) {
107			ch <- countMatches(ss, bytes)
108		}(s)
109	}
110
111	lenresult := make(chan int)
112	bb := bytes
113	go func() {
114		for _, sub := range substs {
115			bb = regexp.MustCompile(sub.pat).ReplaceAll(bb, []byte(sub.repl))
116		}
117		lenresult <- len(bb)
118	}()
119
120	for i, s := range variants {
121		fmt.Printf("%s %d\n", s, <-mresults[i])
122	}
123	fmt.Printf("\n%d\n%d\n%d\n", ilen, clen, <-lenresult)
124}
125