update go mod,

move Wavefront String method to debug file,
minor optimizations

pkg/debug.go

@@ -0,0 +1,79 @@
+//go:build debug
+
+package wfa
+
+import (
+	"fmt"
+	"math"
+)
+
+func (w *WavefrontComponent) String(score int) string {
+	traceback_str := []string{"OI", "EI", "OD", "ED", "SB", "IN", "DL", "EN"}
+	s := "<"
+	min_lo := math.MaxInt
+	max_hi := math.MinInt
+
+	for i := 0; i <= score; i++ {
+		if w.lo.Valid(i) && w.lo.Get(i) < min_lo {
+			min_lo = w.lo.Get(i)
+		}
+		if w.hi.Valid(i) && w.hi.Get(i) > max_hi {
+			max_hi = w.hi.Get(i)
+		}
+	}
+
+	for k := min_lo; k <= max_hi; k++ {
+		s = s + fmt.Sprintf("%02d", k)
+		if k < max_hi {
+			s = s + "|"
+		}
+	}
+
+	s = s + ">\t<"
+
+	for k := min_lo; k <= max_hi; k++ {
+		s = s + fmt.Sprintf("%02d", k)
+		if k < max_hi {
+			s = s + "|"
+		}
+	}
+
+	s = s + ">\n"
+
+	for i := 0; i <= score; i++ {
+		s = s + "["
+		lo := w.lo.Get(i)
+		hi := w.hi.Get(i)
+		// print out wavefront matrix
+		for k := min_lo; k <= max_hi; k++ {
+			if w.W.Valid(i) && w.W.Get(i).Valid(k) {
+				s = s + fmt.Sprintf("%02d", w.W.Get(i).Get(k))
+			} else if k < lo || k > hi {
+				s = s + "--"
+			} else {
+				s = s + "  "
+			}
+
+			if k < max_hi {
+				s = s + "|"
+			}
+		}
+		s = s + "]\t["
+		// print out traceback matrix
+		for k := min_lo; k <= max_hi; k++ {
+			if w.A.Valid(i) && w.A.Get(i).Valid(k) {
+				s = s + traceback_str[w.A.Get(i).Get(k)]
+			} else if k < lo || k > hi {
+				s = s + "--"
+			} else {
+				s = s + "  "
+			}
+
+			if k < max_hi {
+				s = s + "|"
+			}
+		}
+		s = s + "]\n"
+	}
+	return s
+}