First commit

pkg/obiseq/revcomp.go

@@ -0,0 +1,26 @@
+package obiseq
+
+//                          ".ABCDEFGHIJKLMNOPQRSTUVWXYZ#![]"
+var __revcmp_dna__ = []byte(".TVGHEFCDIJMLKNOPQYSAABWXRZ#!][")
+
+// Reverse complements a DNA sequence.
+// If the inplace parametter is true, that operation is done in place.
+func (sequence BioSequence) ReverseComplement(inplace bool) BioSequence {
+
+	if !inplace {
+		sequence = sequence.Copy()
+	}
+
+	s := sequence.sequence.sequence.Bytes()
+
+	for i, j := sequence.Length()-1, 0; i >= j; i-- {
+
+		s[j], s[i] = __revcmp_dna__[s[i]&31]|(s[i]&0x20),
+			__revcmp_dna__[s[j]&31]|(s[j]&0x20)
+		j++
+	}
+
+	sequence.sequence.id.WriteString("_revcomp")
+
+	return sequence
+}