Fix parsing of URLs with plus signs (#1335)

This fixes an issue where URLs with schemes that contain `+`, `-`, and
`.` would not be parsed correctly.

For example, `foo+bar:///?baz.pkl` would turn into
`foo+bar:///%3Fbaz.pkl`. The query param is lost, and turned into the
path.

Author: bioball

pkl-core/src/main/java/org/pkl/core/util/IoUtils.java

@@ -48,7 +48,7 @@
 public final class IoUtils {
 
   // Don't match paths like `C:\`, which are drive letters on Windows.
-  private static final Pattern uriLike = Pattern.compile("\\w+:[^\\\\].*");
+  private static final Pattern uriLike = Pattern.compile("[\\w+.-]+:[^\\\\].*");
 
   private static final Pattern windowsPathLike = Pattern.compile("\\w:\\\\.*");
 

pkl-core/src/test/files/LanguageSnippetTests/input/api/Resource.pkl

@@ -52,4 +52,10 @@ examples {
 
     new Resource { base64 = "AQIDBA==" }.bytes
   }
+
+  // test parsing of URIs.
+  // see https://github.com/apple/pkl/pull/1335
+  ["absolute URI scheme with plus"] {
+    module.catch(() -> read("foo+bar///?baz=buz"))
+  }
 }

pkl-core/src/test/files/LanguageSnippetTests/output/api/Resource.pcf

@@ -36,4 +36,7 @@ examples {
     "AQIDBA=="
     Bytes(1, 2, 3, 4)
   }
+  ["absolute URI scheme with plus"] {
+    "Cannot find resource `foo+bar///?baz=buz`."
+  }
 }