mirror of
https://github.com/golang/go
synced 2024-11-22 17:24:53 -07:00
117 lines
3.2 KiB
Go
117 lines
3.2 KiB
Go
/*
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of "The Computer Language Benchmarks Game" nor the
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name of "The Computer Language Shootout Benchmarks" nor the names of
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its contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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/* The Computer Language Benchmarks Game
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* http://shootout.alioth.debian.org/
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*
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* contributed by The Go Authors.
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*/
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package main
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import (
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"fmt";
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"io";
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"os";
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"regexp";
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"strings";
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)
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func compile(s string) *regexp.Regexp {
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r, err := regexp.Compile(s);
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if err != nil {
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fmt.Fprintf(os.Stderr, "can't compile pattern %q: %s\n", s, err);
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os.Exit(2);
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}
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return r;
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}
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var variants = []string {
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"agggtaaa|tttaccct",
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"[cgt]gggtaaa|tttaccc[acg]",
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"a[act]ggtaaa|tttacc[agt]t",
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"ag[act]gtaaa|tttac[agt]ct",
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"agg[act]taaa|ttta[agt]cct",
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"aggg[acg]aaa|ttt[cgt]ccct",
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"agggt[cgt]aa|tt[acg]accct",
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"agggta[cgt]a|t[acg]taccct",
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"agggtaa[cgt]|[acg]ttaccct",
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}
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type Subst struct {
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pat, repl string
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}
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var substs = [] Subst {
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Subst {"B", "(c|g|t)"},
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Subst {"D", "(a|g|t)"},
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Subst {"H", "(a|c|t)"},
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Subst {"K", "(g|t)"},
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Subst {"M", "(a|c)"},
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Subst {"N", "(a|c|g|t)"},
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Subst {"R", "(a|g)"},
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Subst {"S", "(c|g)"},
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Subst {"V", "(a|c|g)"},
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Subst {"W", "(a|t)"},
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Subst {"Y", "(c|t)"},
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}
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func countMatches(pat string, bytes []byte) int {
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re := compile(pat);
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n := 0;
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for {
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e := re.Execute(bytes);
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if len(e) == 0 {
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break;
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}
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n++;
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bytes = bytes[e[1]:len(bytes)];
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}
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return n;
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}
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func main() {
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bytes, err := io.ReadFile("/dev/stdin");
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if err != nil {
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fmt.Fprintf(os.Stderr, "can't read input: %s\n", err);
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os.Exit(2);
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}
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ilen := len(bytes);
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// Delete the comment lines and newlines
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bytes = compile("(>[^\n]+)?\n").ReplaceAll(bytes, []byte{});
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clen := len(bytes);
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for _, s := range variants {
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fmt.Printf("%s %d\n", s, countMatches(s, bytes));
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}
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for _, sub := range substs {
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bytes = compile(sub.pat).ReplaceAll(bytes, strings.Bytes(sub.repl));
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}
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fmt.Printf("\n%d\n%d\n%d\n", ilen, clen, len(bytes));
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}
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