Implement line and column numbers.

pkg/front_end/lib/src/fasta/source/source_loader.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library fasta.source_loader;
 
 import 'dart:async' show
     Future;
 
 import 'dart:io' show
     FileSystemException;
 
 import 'package:front_end/src/fasta/scanner/io.dart' show
     readBytesFromFile;
 
 import 'package:front_end/src/fasta/scanner.dart' show
     ErrorToken,
+    ScannerResult,
     Token,
     scan;
 
 import 'package:front_end/src/fasta/parser/class_member_parser.dart' show
     ClassMemberParser;
 
 import 'package:kernel/ast.dart' show
     Program;
 
 import 'package:kernel/class_hierarchy.dart' show
     ClassHierarchy;
 
 import 'package:kernel/core_types.dart' show
     CoreTypes;
 
 import '../errors.dart' show
     InputError,
     inputError;
 
+import '../messages.dart' show
+    warning;
+
 import '../export.dart' show
     Export;
 
 import '../analyzer/element_store.dart' show
     ElementStore;
 
 import '../builder/builder.dart' show
     Builder,
     ClassBuilder,
     LibraryBuilder;
@@ skipping 32 matching lines @@
 
   Future<Token> tokenize(SourceLibraryBuilder library,
       {bool suppressLexicalErrors: false}) async {
     Uri uri = library.fileUri;
     if (uri == null || uri.scheme != "file") {
       return inputError(library.uri, -1, "Not found: ${library.uri}.");
     }
     try {
       List<int> bytes = await readBytesFromFile(uri);
       byteCount += bytes.length - 1;
-      Token token = scan(bytes).tokens;
+      ScannerResult result = scan(bytes);
+      Token token = result.tokens;
+      if (!suppressLexicalErrors) {
+        target.addLineStarts(library.fileUri, result.lineStarts);
+      }
       while (token is ErrorToken) {
         if (!suppressLexicalErrors) {
           ErrorToken error = token;
-          String message = new InputError(
-              uri, token.charOffset, error.assertionMessage).format();
-          print(message);
+          print(new InputError(uri, token.charOffset, error.assertionMessage)
+              .format());
         }
         token = token.next;
       }
       return token;
     } on FileSystemException catch (e) {
       String message = e.message;
       String osMessage = e.osError?.message;
       if (osMessage != null && osMessage.isNotEmpty) {
         message = osMessage;
       }
@@ skipping 15 matching lines @@
       // time we suppress lexical errors.
       Token tokens = await tokenize(library, suppressLexicalErrors: true);
       if (tokens == null) return;
       DietListener listener = new DietListener(
           library, elementStore, hierarchy, coreTypes, astKind);
       DietParser parser = new DietParser(listener);
       parser.parseUnit(tokens);
       for (SourceLibraryBuilder part in library.parts) {
         Token tokens = await tokenize(part);
         if (tokens != null) {
+          listener.uri = part.fileUri;
           parser.parseUnit(tokens);
         }
       }
     }
   }
 
   void resolveParts() {
     List<Uri> parts = <Uri>[];
     builders.forEach((Uri uri, LibraryBuilder library) {
         if (library is SourceLibraryBuilder) {
@@ skipping 187 matching lines @@
     realCycles.forEach((ClassBuilder cls, Set<ClassBuilder> cycles) {
       target.breakCycle(cls);
       if (reported.add(cls)) {
         List<ClassBuilder> involved = <ClassBuilder>[];
         for (ClassBuilder cls in cycles) {
           if (realCycles.containsKey(cls)) {
             involved.add(cls);
             reported.add(cls);
           }
         }
-        print("${cls.name} is a supertype of itself via "
-            "${involved.map((c) => c.name).join(' ')}");
+        warning(cls.fileUri, cls.charOffset, "'${cls.name}' is a supertype of "
+            "itself via '${involved.map((c) => c.name).join(' ')}'.");
       }
     });
     ticker.logMs("Found cycles");
   }
 
   void buildProgram() {
     builders.forEach((Uri uri, LibraryBuilder library) {
       if (library is SourceLibraryBuilder) {
         libraries.add(library.build());
       }
     });
     ticker.logMs("Built program");
   }
 
   void buildElementStore() {
     elementStore = new ElementStore(coreLibrary, builders);
     ticker.logMs("Built analyzer element model.");
   }
 
   void computeHierarchy(Program program) {
     hierarchy = new ClassHierarchy(program);
     ticker.logMs("Computed class hierarchy");
     coreTypes = new CoreTypes(program);
     ticker.logMs("Computed core types");
   }
 }