Fasta logging.

pkg/fasta/bin/log_analyzer.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.
+
+import 'dart:convert' show
+    JSON;
+
+import 'dart:io';
+
+import 'package:testing/src/run_tests.dart' show
+    CommandLine;
+
+main(List<String> arguments) async {
+  CommandLine cl = CommandLine.parse(arguments);
+  Set<String> fields = cl.commaSeparated("--fields=");
+  if (fields.isEmpty) {
+    fields.addAll(["uri", "offset", "json:error"]);
+  }
+  for (String filename in cl.arguments) {
+    String json = await new File(filename).readAsString();
+    Map<String, dynamic> data = JSON.decode(json) as Map<String, dynamic>;
+    StringBuffer sb = new StringBuffer();
+    bool isFirst = true;
+    for (String field in fields) {
+      if (!isFirst) {
+        sb.write(":");
+      }
+      if (field.startsWith("json:")) {
+        field = field.substring(5);
+        sb.write(JSON.encode(data[field]));
+      } else {
+        sb.write(data[field]);
+      }
+      isFirst = false;
+    }
+    print("$sb");
+  }
+}