regex-dna-parallel.go

Documentation: golang.org/x/exp/shootout

     1  //go:build ignore
     2  // +build ignore
     3  
     4  /*
     5  Redistribution and use in source and binary forms, with or without
     6  modification, are permitted provided that the following conditions are met:
     7  
     8      * Redistributions of source code must retain the above copyright
     9      notice, this list of conditions and the following disclaimer.
    10  
    11      * Redistributions in binary form must reproduce the above copyright
    12      notice, this list of conditions and the following disclaimer in the
    13      documentation and/or other materials provided with the distribution.
    14  
    15      * Neither the name of "The Computer Language Benchmarks Game" nor the
    16      name of "The Computer Language Shootout Benchmarks" nor the names of
    17      its contributors may be used to endorse or promote products derived
    18      from this software without specific prior written permission.
    19  
    20  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    21  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    22  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    23  ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
    24  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
    25  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
    26  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    27  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
    28  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    29  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    30  POSSIBILITY OF SUCH DAMAGE.
    31  */
    32  
    33  /* The Computer Language Benchmarks Game
    34   * http://shootout.alioth.debian.org/
    35   *
    36   * contributed by The Go Authors.
    37   */
    38  
    39  package main
    40  
    41  import (
    42  	"fmt"
    43  	"io"
    44  	"os"
    45  	"regexp"
    46  	"runtime"
    47  )
    48  
    49  var variants = []string{
    50  	"agggtaaa|tttaccct",
    51  	"[cgt]gggtaaa|tttaccc[acg]",
    52  	"a[act]ggtaaa|tttacc[agt]t",
    53  	"ag[act]gtaaa|tttac[agt]ct",
    54  	"agg[act]taaa|ttta[agt]cct",
    55  	"aggg[acg]aaa|ttt[cgt]ccct",
    56  	"agggt[cgt]aa|tt[acg]accct",
    57  	"agggta[cgt]a|t[acg]taccct",
    58  	"agggtaa[cgt]|[acg]ttaccct",
    59  }
    60  
    61  type Subst struct {
    62  	pat, repl string
    63  }
    64  
    65  var substs = []Subst{
    66  	Subst{"B", "(c|g|t)"},
    67  	Subst{"D", "(a|g|t)"},
    68  	Subst{"H", "(a|c|t)"},
    69  	Subst{"K", "(g|t)"},
    70  	Subst{"M", "(a|c)"},
    71  	Subst{"N", "(a|c|g|t)"},
    72  	Subst{"R", "(a|g)"},
    73  	Subst{"S", "(c|g)"},
    74  	Subst{"V", "(a|c|g)"},
    75  	Subst{"W", "(a|t)"},
    76  	Subst{"Y", "(c|t)"},
    77  }
    78  
    79  func countMatches(pat string, bytes []byte) int {
    80  	re := regexp.MustCompile(pat)
    81  	n := 0
    82  	for {
    83  		e := re.FindIndex(bytes)
    84  		if e == nil {
    85  			break
    86  		}
    87  		n++
    88  		bytes = bytes[e[1]:]
    89  	}
    90  	return n
    91  }
    92  
    93  func main() {
    94  	runtime.GOMAXPROCS(4)
    95  	bytes, err := io.ReadAll(os.Stdin)
    96  	if err != nil {
    97  		fmt.Fprintf(os.Stderr, "can't read input: %s\n", err)
    98  		os.Exit(2)
    99  	}
   100  	ilen := len(bytes)
   101  	// Delete the comment lines and newlines
   102  	bytes = regexp.MustCompile("(>[^\n]+)?\n").ReplaceAll(bytes, []byte{})
   103  	clen := len(bytes)
   104  
   105  	mresults := make([]chan int, len(variants))
   106  	for i, s := range variants {
   107  		ch := make(chan int)
   108  		mresults[i] = ch
   109  		go func(ss string) {
   110  			ch <- countMatches(ss, bytes)
   111  		}(s)
   112  	}
   113  
   114  	lenresult := make(chan int)
   115  	bb := bytes
   116  	go func() {
   117  		for _, sub := range substs {
   118  			bb = regexp.MustCompile(sub.pat).ReplaceAll(bb, []byte(sub.repl))
   119  		}
   120  		lenresult <- len(bb)
   121  	}()
   122  
   123  	for i, s := range variants {
   124  		fmt.Printf("%s %d\n", s, <-mresults[i])
   125  	}
   126  	fmt.Printf("\n%d\n%d\n%d\n", ilen, clen, <-lenresult)
   127  }
   128
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