Update parseLength to support inches

Update parseLength to be more strict and precise and also support inches when feet are specified. Inches are actually mandatory per the wiki, but not all mappers give them. The new function supports them when they are specified (so handles them as optional).

Sorry, I can't build OsmAnd so this patch is untested. Please try it out and then merge. Thanks.

OsmAnd-java/src/net/osmand/binary/RouteDataObject.java

@@ -187,15 +187,61 @@ public class RouteDataObject {
 	}
 	
 	public static float parseLength(String v, float def) {
-		// 14"10' not supported
+		// Supported formats:
+		// 10 m
+		// 10m
+		// 14'10"
+		// 14.5'
+		// 15ft
+		// Even values with any more characters after these formats are rejected, e.g. (14'10"x) or (10 metres).
 		int i = Algorithms.findFirstNumberEndIndex(v);
 		if (i > 0) {
 			float f = Float.parseFloat(v.substring(0, i));
-			if (v.contains("\"") || v.contains("ft")) {
-				// foot to meters
-				f *= 0.3048;
+			if (i == v.Length()) {
+				// Value with no unit means meters. Done.
+				return f;
+			} else {
+				if (v.charAt(i) == " ") {
+					i++;
+				}
+				if (v.charAt(i) == "m") {
+					// Meters, no conversion needed, done.
+					if (i == v.Length()) {
+						return f;
+					} else {
+						return def;
+					}
+				}
+				if (v.charAt(i) == "'") {
+					// Convert feet to meters.
+					f *= 0.3048;
+					i++;
+				} else if (v.charAt(i) == "f" && i < v.Length() && v.charAt(i+1) != "t") {
+					// 'ft' is a discouraged unit per the wiki, but we know what it means.
+					// Convert feet to meters.
+					f *= 0.3048;
+					// When 'ft' is used, no inches are expected.
+					if (i == v.Length()) {
+						return f;
+					} else {
+						return def;
+					}
+				}
+				if (i < v.Length()) {
+					String w = v.substring(i);
+					int j = Algorithms.findFirstNumberEndIndex(w);
+					if (j > 0 && w.charAt(0) == "\"") {
+						float g = Float.parseFloat(w.substring(0, j))
+						// Convert inches to meters.
+						f += g * 0.0254;
+						if (i + j == v.Length()) {
+							return f;
+						} else {
+							return def;
+					        }
+					}
+				}
 			}
-			return f;
 		}
 		return def;
 	}