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https://github.com/golang/go
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106 lines
3.0 KiB
Go
106 lines
3.0 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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"bufio"
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"os"
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)
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const lineSize = 60
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var complement = [256]uint8{
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'A': 'T', 'a': 'T',
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'C': 'G', 'c': 'G',
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'G': 'C', 'g': 'C',
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'T': 'A', 't': 'A',
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'U': 'A', 'u': 'A',
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'M': 'K', 'm': 'K',
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'R': 'Y', 'r': 'Y',
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'W': 'W', 'w': 'W',
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'S': 'S', 's': 'S',
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'Y': 'R', 'y': 'R',
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'K': 'M', 'k': 'M',
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'V': 'B', 'v': 'B',
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'H': 'D', 'h': 'D',
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'D': 'H', 'd': 'H',
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'B': 'V', 'b': 'V',
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'N': 'N', 'n': 'N',
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}
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func main() {
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in := bufio.NewReader(os.Stdin)
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buf := make([]byte, 1024*1024)
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line, err := in.ReadSlice('\n')
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for err == nil {
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os.Stdout.Write(line)
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// Accumulate reversed complement in buf[w:]
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nchar := 0
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w := len(buf)
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for {
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line, err = in.ReadSlice('\n')
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if err != nil || line[0] == '>' {
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break
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}
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line = line[0 : len(line)-1]
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nchar += len(line)
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if len(line)+nchar/60+128 >= w {
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nbuf := make([]byte, len(buf)*5)
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copy(nbuf[len(nbuf)-len(buf):], buf)
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w += len(nbuf) - len(buf)
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buf = nbuf
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}
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// This loop is the bottleneck.
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for _, c := range line {
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w--
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buf[w] = complement[c]
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}
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}
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// Copy down to beginning of buffer, inserting newlines.
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// The loop left room for the newlines and 128 bytes of padding.
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i := 0
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for j := w; j < len(buf); j += 60 {
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n := copy(buf[i:i+60], buf[j:])
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buf[i+n] = '\n'
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i += n + 1
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}
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os.Stdout.Write(buf[0:i])
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}
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}
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