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      1 /*
      2 Redistribution and use in source and binary forms, with or without
      3 modification, 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 
     17 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
     18 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     19 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     20 ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
     21 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     22 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     23 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     24 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     25 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     26 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     27 POSSIBILITY 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 
     36 package main
     37 
     38 import (
     39 	"fmt"
     40 	"io/ioutil"
     41 	"os"
     42 	"regexp"
     43 	"runtime"
     44 )
     45 
     46 var 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 
     58 type Subst struct {
     59 	pat, repl string
     60 }
     61 
     62 var 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 
     76 func 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 
     90 func 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