Extract SourceFile aware provider/handler.

sdk/lib/_internal/compiler/implementation/source_file_provider.dart

+// Copyright (c) 2012, 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 source_file_provider;
+
+import 'dart:async';
+import 'dart:uri';
+import 'dart:io';
+import 'dart:utf';
+
+import '../compiler.dart' as api show Diagnostic;
+import 'dart2js.dart' show AbortLeg;
+import 'colors.dart' as colors;
+import 'source_file.dart';
+import 'filenames.dart';
+import 'util/uri_extras.dart';
+
+String readAll(String filename) {
+  var file = (new File(filename)).openSync(FileMode.READ);
+  var length = file.lengthSync();
+  var buffer = new List<int>.fixedLength(length);
+  var bytes = file.readListSync(buffer, 0, length);
+  file.closeSync();
+  return new String.fromCharCodes(new Utf8Decoder(buffer).decodeRest());
+}
+
+class SourceFileProvider {
+  bool isWindows = (Platform.operatingSystem == 'windows');
+  Uri cwd = getCurrentDirectory();
+  Map<String, SourceFile> sourceFiles = <String, SourceFile>{};
+  int dartBytesRead = 0;
+
+  Future<String> readStringFromUri(Uri resourceUri) {
+    if (resourceUri.scheme != 'file') {
+      throw new ArgumentError(resourceUri);
+    }
+    String source;
+    try {
+      source = readAll(uriPathToNative(resourceUri.path));
+    } on FileIOException catch (ex) {
+      throw 'Error: Cannot read "${relativize(cwd, resourceUri, isWindows)}" '
+            '(${ex.osError}).';
+    }
+    dartBytesRead += source.length;
+    sourceFiles[resourceUri.toString()] =
+      new SourceFile(relativize(cwd, resourceUri, isWindows), source);
+    return new Future.immediate(source);
+  }
+}
+
+class FormattingDiagnosticHandler {
+  final SourceFileProvider provider;
+  bool showWarnings = true;
+  bool verbose = false;
+  bool isAborting = false;
+  bool enableColors = false;
+  bool throwOnError = false;
+
+  final int FATAL = api.Diagnostic.CRASH.ordinal | api.Diagnostic.ERROR.ordinal;
+  final int INFO =
+      api.Diagnostic.INFO.ordinal | api.Diagnostic.VERBOSE_INFO.ordinal;
+
+  FormattingDiagnosticHandler(SourceFileProvider this.provider);
+
+  void info(var message, [api.Diagnostic kind = api.Diagnostic.VERBOSE_INFO]) {
+    if (!verbose && identical(kind, api.Diagnostic.VERBOSE_INFO)) return;
+    if (enableColors) {
+      print('${colors.green("info:")} $message');
+    } else {
+      print('info: $message');
+    }
+  }
+
+  void diagnosticHandler(Uri uri, int begin, int end, String message,
+                         api.Diagnostic kind) {
+    // TODO(ahe): Remove this when source map is handled differently.
+    if (identical(kind.name, 'source map')) return;
+
+    if (isAborting) return;
+    isAborting = identical(kind, api.Diagnostic.CRASH);
+    bool fatal = (kind.ordinal & FATAL) != 0;
+    bool isInfo = (kind.ordinal & INFO) != 0;
+    if (isInfo && uri == null && !identical(kind, api.Diagnostic.INFO)) {
+      info(message, kind);
+      return;
+    }
+    var color;
+    if (!enableColors) {
+      color = (x) => x;
+    } else if (identical(kind, api.Diagnostic.ERROR)) {
+      color = colors.red;
+    } else if (identical(kind, api.Diagnostic.WARNING)) {
+      color = colors.magenta;
+    } else if (identical(kind, api.Diagnostic.LINT)) {
+      color = colors.magenta;
+    } else if (identical(kind, api.Diagnostic.CRASH)) {
+      color = colors.red;
+    } else if (identical(kind, api.Diagnostic.INFO)) {
+      color = colors.green;
+    } else {
+      throw 'Unknown kind: $kind (${kind.ordinal})';
+    }
+    if (uri == null) {
+      assert(fatal);
+      print(color(message));
+    } else if (fatal || showWarnings) {
+      SourceFile file = provider.sourceFiles[uri.toString()];
+      if (file == null) {
+        throw '$uri: file is null';
+      }
+      print(file.getLocationMessage(color(message), begin, end, true, color));
+    }
+    if (fatal && throwOnError) {
+      isAborting = true;
+      throw new AbortLeg(message);
+    }
+  }
+}
+
+