[librsvg/rustify-rsvg-convert] PathOrUrl: extract function to do the UTF8-to-PathOrUrl heuristic

[Federico Mena Quintero <federico src gnome org>]

commit 829d3acbeee9ddfffa60e4cc674255d2c1919c98
Author: Federico Mena Quintero <federico gnome org>
Date:   Thu Jan 21 13:19:54 2021 -0600

    PathOrUrl: extract function to do the UTF8-to-PathOrUrl heuristic

 src/c_api/handle.rs | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)
---
diff --git a/src/c_api/handle.rs b/src/c_api/handle.rs
index 8bcf0208..3e5df6c7 100644
--- a/src/c_api/handle.rs
+++ b/src/c_api/handle.rs
@@ -2145,16 +2145,19 @@ impl PathOrUrl {
         Ok(cstr
             .to_str()
             .map_err(|_| ())
-            .and_then(|utf8| Url::parse(utf8).map_err(|_| ()))
-            .and_then(|url| {
-                if url.origin().is_tuple() || url.scheme() == "file" {
-                    Ok(PathOrUrl::Url(url))
-                } else {
-                    Ok(PathOrUrl::Path(url.to_file_path()?))
-                }
-            })
+            .and_then(Self::try_from_str)
             .unwrap_or_else(|_| PathOrUrl::Path(PathBuf::from_glib_none(s))))
     }
+
+    fn try_from_str(s: &str) -> Result<PathOrUrl, ()> {
+        Url::parse(s).map_err(|_| ()).and_then(|url| {
+            if url.origin().is_tuple() || url.scheme() == "file" {
+                Ok(PathOrUrl::Url(url))
+            } else {
+                Ok(PathOrUrl::Path(url.to_file_path()?))
+            }
+        })
+    }
 }
 
 fn check_cairo_context(cr: &cairo::Context) -> Result<(), RenderingError> {