Add some user-friendly utility functions to pkg/analyzer_experimental.

pkg/analyzer_experimental/lib/error_formatter.dart

-part of analyzer;
-
-/**
- * Helper for formatting [AnalysisError]s.
- * The two format options are a user consumable format and a machine consumable format.
- */
-class _ErrorFormatter {
-  StringSink out;
-  CommandLineOptions options;
-
-  _ErrorFormatter(this.out, this.options);
-
-  void startAnalysis() {
-    if (!options.machineFormat) {
-      out.writeln("Analyzing ${options.sourceFiles}...");
-    }
-  }
-
-  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) {
-        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;
-    for (AnalysisError error in errors) {
-      if (error.errorCode.errorSeverity == ErrorSeverity.ERROR) {
-        errorCount++;
-      } else if (error.errorCode.errorSeverity == ErrorSeverity.WARNING) {
-        if (options.warningsAreFatal) {
-          errorCount++;
-        } else {
-          warnCount++;
-        }
-      }
-      formatError(errorToLine, error);
-    }
-    // print statistics
-    if (!options.machineFormat) {
-      if (errorCount != 0 && warnCount != 0) {
-        out.write(errorCount);
-        out.write(' ');
-        out.write(pluralize("error", errorCount));
-        out.write(' and ');
-        out.write(warnCount);
-        out.write(' ');
-        out.write(pluralize("warning", warnCount));
-        out.writeln(' found.');
-      } else if (errorCount != 0) {
-        out.write(errorCount);
-        out.write(' ');
-        out.write(pluralize("error", errorCount));
-        out.writeln(' found.');
-      } else if (warnCount != 0) {
-        out.write(warnCount);
-        out.write(' ');
-        out.write(pluralize("warning", warnCount));
-        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.writeln(escapePipe(error.message));
-    } else {
-      // [warning] 'foo' is not a method or function (/Users/devoncarew/temp/foo.dart:-1:-1)
-      out.write('[');
-      out.write(severity.displayName);
-      out.write('] ');
-      out.write(error.message);
-      out.write(' (');
-      out.write(source.fullName);
-      out.write(':');
-      out.write(location.lineNumber);
-      out.write(':');
-      out.write(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";
-    }
-  }
-}