Remove hg dep

modules/mahonia/fallback.go

@@ -0,0 +1,19 @@
+package mahonia
+
+// FallbackDecoder combines a series of Decoders into one.
+// If the first Decoder returns a status of INVALID_CHAR, the others are tried as well.
+//
+// Note: if the text to be decoded ends with a sequence of bytes that is not a valid character in the first charset,
+// but it could be the beginning of a valid character, the FallbackDecoder will give a status of NO_ROOM instead of
+// falling back to the other Decoders.
+func FallbackDecoder(decoders ...Decoder) Decoder {
+	return func(p []byte) (c rune, size int, status Status) {
+		for _, d := range decoders {
+			c, size, status = d(p)
+			if status != INVALID_CHAR {
+				return
+			}
+		}
+		return 0, 1, INVALID_CHAR
+	}
+}