Add observatory_pub_packages snapshot to third_party

observatory_pub_packages/analyzer/src/error_formatter.dart

Index: observatory_pub_packages/analyzer/src/error_formatter.dart
===================================================================
--- observatory_pub_packages/analyzer/src/error_formatter.dart	(revision 0)
+++ observatory_pub_packages/analyzer/src/error_formatter.dart	(working copy)
@@ -0,0 +1,173 @@
+// Copyright (c) 2013, 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 error_formatter;
+
+import 'generated/engine.dart';
+import 'generated/error.dart';
+import 'generated/source_io.dart';
+import '../options.dart';
+
+/// Returns `true` if [AnalysisError] should be printed.
+typedef bool _ErrorFilter(AnalysisError error);
+
+/// Allows any [AnalysisError].
+bool _anyError(AnalysisError error) => true;
+
+/**
+ * Helper for formatting [AnalysisError]s.
+ * The two format options are a user consumable format and a machine consumable format.
+ */
+class ErrorFormatter {
+  final StringSink out;
+  final CommandLineOptions options;
+  final _ErrorFilter errorFilter;
+
+  ErrorFormatter(this.out, this.options, [this.errorFilter = _anyError]);
+
+  void formatErrors(List<AnalysisErrorInfo> errorInfos) {
+    var errors = new List<AnalysisError>();
+    var errorToLine = new Map<AnalysisError, LineInfo>();
+    for (AnalysisErrorInfo errorInfo in errorInfos) {
+      for (AnalysisError error in errorInfo.errors) {
+        if (errorFilter(error)) {
+          errors.add(error);
+          errorToLine[error] = errorInfo.lineInfo;
+        }
+      }
+    }
+    // sort errors
+    errors.sort((AnalysisError error1, AnalysisError error2) {
+      // severity
+      int compare = error2.errorCode.errorSeverity.compareTo(error1.errorCode.errorSeverity);
+      if (compare != 0) {
+        return compare;
+      }
+      // path
+      compare = Comparable.compare(error1.source.fullName.toLowerCase(), error2.source.fullName.toLowerCase());
+      if (compare != 0) {
+        return compare;
+      }
+      // offset
+      return error1.offset - error2.offset;
+    });
+    // format errors
+    int errorCount = 0;
+    int warnCount = 0;
+    int hintCount = 0;
+    for (AnalysisError error in errors) {
+      var severity = error.errorCode.errorSeverity;
+      if (severity == ErrorSeverity.ERROR) {
+        errorCount++;
+      } else if (severity == ErrorSeverity.WARNING) {
+        if (options.warningsAreFatal) {
+          errorCount++;
+        } else {
+          if (error.errorCode.type == ErrorType.HINT) {
+            hintCount++;
+          } else {
+            warnCount++;
+          }
+        }
+      }
+      formatError(errorToLine, error);
+    }
+    // print statistics
+    if (!options.machineFormat) {
+      var hasErrors = errorCount != 0;
+      var hasWarns = warnCount != 0;
+      var hasHints = hintCount != 0;
+      bool hasContent = false;
+      if (hasErrors) {
+        out.write(errorCount);
+        out.write(' ');
+        out.write(pluralize("error", errorCount));
+        hasContent = true;
+      }
+      if (hasWarns) {
+        if (hasContent) {
+          if (!hasHints) {
+            out.write(' and ');
+          } else {
+            out.write(", ");
+          }
+        }
+        out.write(warnCount);
+        out.write(' ');
+        out.write(pluralize("warning", warnCount));
+        hasContent = true;
+      }
+      if (hasHints) {
+        if (hasContent) {
+          out.write(" and ");
+        }
+        out.write(hintCount);
+        out.write(' ');
+        out.write(pluralize("hint", hintCount));
+        hasContent = true;
+      }
+      if (hasContent) {
+        out.writeln(" found.");
+      } else {
+        out.writeln("No issues found");
+      }
+    }
+  }
+
+  void formatError(Map<AnalysisError, LineInfo> errorToLine, AnalysisError error) {
+    Source source = error.source;
+    LineInfo_Location location = errorToLine[error].getLocation(error.offset);
+    int length = error.length;
+    var severity = error.errorCode.errorSeverity;
+    if (options.machineFormat) {
+      if (severity == ErrorSeverity.WARNING && options.warningsAreFatal) {
+        severity = ErrorSeverity.ERROR;
+      }
+      out.write(severity);
+      out.write('|');
+      out.write(error.errorCode.type);
+      out.write('|');
+      out.write(error.errorCode);
+      out.write('|');
+      out.write(escapePipe(source.fullName));
+      out.write('|');
+      out.write(location.lineNumber);
+      out.write('|');
+      out.write(location.columnNumber);
+      out.write('|');
+      out.write(length);
+      out.write('|');
+      out.write(escapePipe(error.message));
+    } else {
+      String errorType = error.errorCode.errorSeverity.displayName;
+      if (error.errorCode.type == ErrorType.HINT) {
+        errorType = error.errorCode.type.displayName;
+      }
+      // [warning] 'foo' is not a... (/Users/.../tmp/foo.dart, line 1, col 2)
+      out.write('[$errorType] ${error.message} ');
+      out.write('(${source.fullName}');
+      out.write(', line ${location.lineNumber}, col ${location.columnNumber})');
+    }
+    out.writeln();
+  }
+
+  static String escapePipe(String input) {
+    var result = new StringBuffer();
+    for (var c in input.codeUnits) {
+      if (c == '\\' || c == '|') {
+        result.write('\\');
+      }
+      result.writeCharCode(c);
+    }
+    return result.toString();
+  }
+
+  static String pluralize(String word, int count) {
+    if (count == 1) {
+      return word;
+    } else {
+      return word + "s";
+    }
+  }
+}