kill perf

runes/runes.go

@@ -0,0 +1,98 @@
+package runes
+
+func Create(rs ...[]rune) (x []rune) {
+	for _, r := range rs {
+		x = append(x, r...)
+	}
+	return x
+}
+
+func IndexRune(s []rune, r rune) int {
+	for i, sr := range s {
+		if r == sr {
+			return i
+		}
+	}
+	return -1
+}
+
+func LastIndexRune(s []rune, r rune) int {
+	for i := len(s)-1; i >= 0; i-- {
+		sr := s[i]
+		if r == sr {
+			return i
+		}
+	}
+	return -1
+}
+
+func Equals(a, b []rune) bool {
+	if len(a) != len(b) {
+		return false
+	}
+	for i := 0; i < len(a); i++ {
+		if a[i] != b[i] {
+			return false
+		}
+	}
+	return true
+}
+
+func Count(s []rune, r rune) (n int) {
+	for _, sr := range s {
+		if sr == r {
+			n++
+		}
+	}
+	return
+}
+
+func HasPrefix(s, prefix []rune) bool {
+	return len(s) >= len(prefix) && Equals(s[0:len(prefix)], prefix)
+}
+
+func HasSuffix(s, suffix []rune) bool {
+	return len(s) >= len(suffix) && Equals(s[len(s)-len(suffix):], suffix)
+}
+
+// TrimPrefix returns s without the provided leading prefix string.
+// If s doesn't start with prefix, s is returned unchanged.
+func TrimPrefix(s, prefix []rune) []rune {
+	if HasPrefix(s, prefix) {
+		return s[len(prefix):]
+	}
+	return s
+}
+
+func TrimRune(s []rune, r rune) (out []rune) {
+	if len(s) == 0 {
+		return nil
+	}
+
+	var i = 0
+	var sr rune
+	// Trim prefix
+	for i, sr = range s {
+		if sr == r {
+			out = s[i:]
+		} else {
+			break
+		}
+	}
+	s = out
+
+	if len(s) == 0 {
+		return nil
+	}
+
+	// Trim suffix
+	for i := len(s)-1; i >= 0; i++ {
+		if s[i] == r {
+			out = s[:i]
+		} else {
+			break
+		}
+	}
+
+	return out
+}