Try to use a Uri with the SourceFile

Author: srawlins

lib/src/mustachio/parser.dart

@@ -20,7 +20,7 @@ class MustachioParser {
   /// The index of the character currently being parsed.
   int _index = 0;
 
-  MustachioParser(this.template, String url)
+  MustachioParser(this.template, Uri url)
       : _templateLength = template.length,
         _sourceFile = SourceFile.fromString(template, url: url);
 

lib/src/mustachio/renderer_base.dart

@@ -89,7 +89,7 @@ class Template {
     // 2) In the case of a reference from a top-level template, user code has
     //    called [Template.parse], and the user is responsible for handling the
     //    exception.
-    var ast = MustachioParser(file.readAsStringSync(), file.path).parse();
+    var ast = MustachioParser(file.readAsStringSync(), file.toUri()).parse();
     var nodeQueue = Queue.of(ast);
     var partials = <String, File>{};
 

test/mustachio/parser_test.dart

@@ -1,7 +1,7 @@
 import 'package:dartdoc/src/mustachio/parser.dart';
 import 'package:test/test.dart';
 
-const _filePath = 'file:///foo.dart';
+final _filePath = Uri.parse('file:///foo.dart');
 
 void main() {
   test('parses an empty template', () {