// 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 'package:analyzer/analyzer.dart';
import 'package:analyzer/dart/ast/token.dart' show Token;
import 'package:analyzer/src/dart/error/syntactic_errors.dart';
import 'package:analyzer/src/generated/resolver.dart' show ResolverErrorCode;
import 'package:front_end/src/api_prototype/compilation_message.dart';
import 'package:front_end/src/fasta/messages.dart' show Code, Message;

/// An error reporter that knows how to convert a Fasta error into an analyzer
/// error.
class FastaErrorReporter {
  /// The underlying error reporter to which errors are reported.
  final ErrorReporter errorReporter;

  /// Initialize a newly created error reporter to report errors to the given
  /// [errorReporter].
  FastaErrorReporter(this.errorReporter);

  void reportByCode(
      String analyzerCode, int offset, int length, Message message) {
    Map<String, dynamic> arguments = message.arguments;

    String lexeme() => (arguments['token'] as Token).lexeme;

    switch (analyzerCode) {
      case "ABSTRACT_CLASS_MEMBER":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.ABSTRACT_CLASS_MEMBER, offset, length);
        return;
      case "ANNOTATION_WITH_TYPE_ARGUMENTS":
        errorReporter?.reportErrorForOffset(
            CompileTimeErrorCode.ANNOTATION_WITH_TYPE_ARGUMENTS,
            offset,
            length);
        return;
      case "ASYNC_FOR_IN_WRONG_CONTEXT":
        errorReporter?.reportErrorForOffset(
            CompileTimeErrorCode.ASYNC_FOR_IN_WRONG_CONTEXT, offset, length);
        return;
      case "ASYNC_KEYWORD_USED_AS_IDENTIFIER":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.ASYNC_KEYWORD_USED_AS_IDENTIFIER, offset, length);
        return;
      case "BREAK_OUTSIDE_OF_LOOP":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.BREAK_OUTSIDE_OF_LOOP, offset, length);
        return;
      case "BUILT_IN_IDENTIFIER_AS_TYPE":
        errorReporter?.reportErrorForOffset(
            CompileTimeErrorCode.BUILT_IN_IDENTIFIER_AS_TYPE,
            offset,
            length,
            [lexeme()]);
        return;
      case "CATCH_SYNTAX":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.CATCH_SYNTAX, offset, length);
        return;
      case "CLASS_IN_CLASS":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.CLASS_IN_CLASS, offset, length);
        return;
      case "COLON_IN_PLACE_OF_IN":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.COLON_IN_PLACE_OF_IN, offset, length);
        return;
      case "CONCRETE_CLASS_WITH_ABSTRACT_MEMBER":
        errorReporter?.reportErrorForOffset(
            StaticWarningCode.CONCRETE_CLASS_WITH_ABSTRACT_MEMBER,
            offset,
            length);
        return;
      case "CONST_AFTER_FACTORY":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.CONST_AFTER_FACTORY, offset, length);
        return;
      case "CONST_AND_COVARIANT":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.CONST_AND_COVARIANT, offset, length);
        return;
      case "CONST_AND_FINAL":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.CONST_AND_FINAL, offset, length);
        return;
      case "CONST_AND_VAR":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.CONST_AND_VAR, offset, length);
        return;
      case "CONST_CLASS":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.CONST_CLASS, offset, length);
        return;
      case "CONST_CONSTRUCTOR_WITH_BODY":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.CONST_CONSTRUCTOR_WITH_BODY, offset, length);
        return;
      case "CONST_FACTORY":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.CONST_FACTORY, offset, length);
        return;
      case "CONST_METHOD":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.CONST_METHOD, offset, length);
        return;
      case "CONST_NOT_INITIALIZED":
        String name = arguments['name'];
        errorReporter?.reportErrorForOffset(
            CompileTimeErrorCode.CONST_NOT_INITIALIZED, offset, length, [name]);
        return;
      case "CONSTRUCTOR_WITH_RETURN_TYPE":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.CONSTRUCTOR_WITH_RETURN_TYPE, offset, length);
        return;
      case "CONTINUE_WITHOUT_LABEL_IN_CASE":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.CONTINUE_WITHOUT_LABEL_IN_CASE, offset, length);
        return;
      case "COVARIANT_AFTER_FINAL":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.COVARIANT_AFTER_FINAL, offset, length);
        return;
      case "COVARIANT_AND_STATIC":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.COVARIANT_AND_STATIC, offset, length);
        return;
      case "DEFAULT_VALUE_IN_FUNCTION_TYPE":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.DEFAULT_VALUE_IN_FUNCTION_TYPE, offset, length);
        return;
      case "DUPLICATE_LABEL_IN_SWITCH_STATEMENT":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.DUPLICATE_LABEL_IN_SWITCH_STATEMENT,
            offset,
            length,
            [arguments['name']]);
        return;
      case "LABEL_UNDEFINED":
        errorReporter?.reportErrorForOffset(
            CompileTimeErrorCode.LABEL_UNDEFINED,
            offset,
            length,
            [arguments['name']]);
        return;
      case "COVARIANT_MEMBER":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.COVARIANT_MEMBER, offset, length);
        return;
      case "DEFERRED_AFTER_PREFIX":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.DEFERRED_AFTER_PREFIX, offset, length);
        return;
      case "DIRECTIVE_AFTER_DECLARATION":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.DIRECTIVE_AFTER_DECLARATION, offset, length);
        return;
      case "DUPLICATE_DEFERRED":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.DUPLICATE_DEFERRED, offset, length);
        return;
      case "DUPLICATED_MODIFIER":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.DUPLICATED_MODIFIER, offset, length, [lexeme()]);
        return;
      case "DUPLICATE_PREFIX":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.DUPLICATE_PREFIX, offset, length);
        return;
      case "EMPTY_ENUM_BODY":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.EMPTY_ENUM_BODY, offset, length);
        return;
      case "ENUM_IN_CLASS":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.ENUM_IN_CLASS, offset, length);
        return;
      case "EXPECTED_CLASS_MEMBER":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.EXPECTED_CLASS_MEMBER, offset, length);
        return;
      case "EXPECTED_EXECUTABLE":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.EXPECTED_EXECUTABLE, offset, length);
        return;
      case "EXPECTED_STRING_LITERAL":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.EXPECTED_STRING_LITERAL, offset, length);
        return;
      case "EXPECTED_TOKEN":
        errorReporter?.reportErrorForOffset(ParserErrorCode.EXPECTED_TOKEN,
            offset, length, [arguments['string']]);
        return;
      case "EXPECTED_TYPE_NAME":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.EXPECTED_TYPE_NAME, offset, length);
        return;
      case "EXPORT_DIRECTIVE_AFTER_PART_DIRECTIVE":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.EXPORT_DIRECTIVE_AFTER_PART_DIRECTIVE,
            offset,
            length);
        return;
      case "EXTERNAL_AFTER_CONST":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.EXTERNAL_AFTER_CONST, offset, length);
        return;
      case "EXTERNAL_AFTER_FACTORY":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.EXTERNAL_AFTER_FACTORY, offset, length);
        return;
      case "EXTERNAL_AFTER_STATIC":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.EXTERNAL_AFTER_STATIC, offset, length);
        return;
      case "EXTERNAL_CONSTRUCTOR_WITH_BODY":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.EXTERNAL_CONSTRUCTOR_WITH_BODY, offset, length);
        return;
      case "EXTERNAL_FIELD":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.EXTERNAL_FIELD, offset, length);
        return;
      case "EXTERNAL_METHOD_WITH_BODY":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.EXTERNAL_METHOD_WITH_BODY, offset, length);
        return;
      case "EXTERNAL_TYPEDEF":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.EXTERNAL_TYPEDEF, offset, length);
        return;
      case "EXTRANEOUS_MODIFIER":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.EXTRANEOUS_MODIFIER, offset, length, [lexeme()]);
        return;
      case "FACTORY_TOP_LEVEL_DECLARATION":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.FACTORY_TOP_LEVEL_DECLARATION, offset, length);
        return;
      case "FIELD_INITIALIZER_OUTSIDE_CONSTRUCTOR":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.FIELD_INITIALIZER_OUTSIDE_CONSTRUCTOR,
            offset,
            length);
        return;
      case "FIELD_INITIALIZER_REDIRECTING_CONSTRUCTOR":
        errorReporter?.reportErrorForOffset(
            CompileTimeErrorCode.FIELD_INITIALIZER_REDIRECTING_CONSTRUCTOR,
            offset,
            length);
        return;
      case "FINAL_AND_COVARIANT":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.FINAL_AND_COVARIANT, offset, length);
        return;
      case "FINAL_AND_VAR":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.FINAL_AND_VAR, offset, length);
        return;
      case "FINAL_NOT_INITIALIZED":
        String name = arguments['name'];
        errorReporter?.reportErrorForOffset(
            StaticWarningCode.FINAL_NOT_INITIALIZED, offset, length, [name]);
        return;
      case "FINAL_NOT_INITIALIZED_CONSTRUCTOR_1":
        String name = arguments['name'];
        errorReporter?.reportErrorForOffset(
            StaticWarningCode.FINAL_NOT_INITIALIZED_CONSTRUCTOR_1,
            offset,
            length,
            [name]);
        return;
      case "FUNCTION_TYPED_PARAMETER_VAR":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.FUNCTION_TYPED_PARAMETER_VAR, offset, length);
        return;
      case "GETTER_WITH_PARAMETERS":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.GETTER_WITH_PARAMETERS, offset, length);
        return;
      case "ILLEGAL_ASSIGNMENT_TO_NON_ASSIGNABLE":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.ILLEGAL_ASSIGNMENT_TO_NON_ASSIGNABLE,
            offset,
            length);
        return;
      case "ILLEGAL_CHARACTER":
        errorReporter?.reportErrorForOffset(
            ScannerErrorCode.ILLEGAL_CHARACTER, offset, length);
        return;
      case "INITIALIZED_VARIABLE_IN_FOR_EACH":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.INITIALIZED_VARIABLE_IN_FOR_EACH, offset, length);
        return;
      case "INVALID_ASSIGNMENT":
        var type1 = arguments['type'];
        var type2 = arguments['type2'];
        errorReporter?.reportErrorForOffset(
            StaticTypeWarningCode.INVALID_ASSIGNMENT,
            offset,
            length,
            [type1, type2]);
        return;
      case "INVALID_INLINE_FUNCTION_TYPE":
        errorReporter?.reportErrorForOffset(
            CompileTimeErrorCode.INVALID_INLINE_FUNCTION_TYPE, offset, length);
        return;
      case "INVALID_LITERAL_IN_CONFIGURATION":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.INVALID_LITERAL_IN_CONFIGURATION, offset, length);
        return;
      case "IMPLEMENTS_BEFORE_EXTENDS":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.IMPLEMENTS_BEFORE_EXTENDS, offset, length);
        return;
      case "IMPLEMENTS_BEFORE_ON":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.IMPLEMENTS_BEFORE_ON, offset, length);
        return;
      case "IMPLEMENTS_BEFORE_WITH":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.IMPLEMENTS_BEFORE_WITH, offset, length);
        return;
      case "IMPORT_OF_NON_LIBRARY":
        errorReporter?.reportErrorForOffset(
            CompileTimeErrorCode.IMPORT_OF_NON_LIBRARY, offset, length);
        return;
      case "INVALID_CAST_FUNCTION":
        errorReporter?.reportErrorForOffset(
            StrongModeCode.INVALID_CAST_FUNCTION, offset, length);
        return;
      case "INVALID_CAST_FUNCTION_EXPR":
        errorReporter?.reportErrorForOffset(
            StrongModeCode.INVALID_CAST_FUNCTION_EXPR, offset, length);
        return;
      case "INVALID_CAST_LITERAL_LIST":
        errorReporter?.reportErrorForOffset(
            StrongModeCode.INVALID_CAST_LITERAL_LIST, offset, length);
        return;
      case "INVALID_CAST_LITERAL_MAP":
        errorReporter?.reportErrorForOffset(
            StrongModeCode.INVALID_CAST_LITERAL_MAP, offset, length);
        return;
      case "INVALID_CAST_METHOD":
        errorReporter?.reportErrorForOffset(
            StrongModeCode.INVALID_CAST_METHOD, offset, length);
        return;
      case "INVALID_CAST_NEW_EXPR":
        errorReporter?.reportErrorForOffset(
            StrongModeCode.INVALID_CAST_NEW_EXPR, offset, length);
        return;
      case "INVALID_CODE_POINT":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.INVALID_CODE_POINT, offset, length, ['\\u{...}']);
        return;
      case "INVALID_CONSTRUCTOR_NAME":
        errorReporter?.reportErrorForOffset(
            CompileTimeErrorCode.INVALID_CONSTRUCTOR_NAME, offset, length);
        return;
      case "INVALID_GENERIC_FUNCTION_TYPE":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.INVALID_GENERIC_FUNCTION_TYPE, offset, length);
        return;
      case "INVALID_METHOD_OVERRIDE":
        errorReporter?.reportErrorForOffset(
            StrongModeCode.INVALID_METHOD_OVERRIDE, offset, length);
        return;
      case "INVALID_MODIFIER_ON_SETTER":
        _reportByCode(CompileTimeErrorCode.INVALID_MODIFIER_ON_SETTER, message,
            offset, length);
        return;
      case "INVALID_OPERATOR_FOR_SUPER":
        _reportByCode(ParserErrorCode.INVALID_OPERATOR_FOR_SUPER, message,
            offset, length);
        return;
      case "INVALID_SUPER_INVOCATION":
        errorReporter?.reportErrorForOffset(
            StrongModeCode.INVALID_SUPER_INVOCATION, offset, length);
        return;
      case "MISSING_CATCH_OR_FINALLY":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.MISSING_CATCH_OR_FINALLY, offset, length);
        return;
      case "MISSING_CLASS_BODY":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.MISSING_CLASS_BODY, offset, length);
        return;
      case "MISSING_DIGIT":
        errorReporter?.reportErrorForOffset(
            ScannerErrorCode.MISSING_DIGIT, offset, length);
        return;
      case "MISSING_ENUM_BODY":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.MISSING_ENUM_BODY, offset, length);
        return;
      case "MISSING_FUNCTION_BODY":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.MISSING_FUNCTION_BODY, offset, length);
        return;
      case "MISSING_FUNCTION_PARAMETERS":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.MISSING_FUNCTION_PARAMETERS, offset, length);
        return;
      case "MISSING_HEX_DIGIT":
        errorReporter?.reportErrorForOffset(
            ScannerErrorCode.MISSING_HEX_DIGIT, offset, length);
        return;
      case "MISSING_IDENTIFIER":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.MISSING_IDENTIFIER, offset, length);
        return;
      case "MISSING_METHOD_PARAMETERS":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.MISSING_METHOD_PARAMETERS, offset, length);
        return;
      case "MISSING_STAR_AFTER_SYNC":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.MISSING_STAR_AFTER_SYNC, offset, length);
        return;
      case "MISSING_TYPEDEF_PARAMETERS":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.MISSING_TYPEDEF_PARAMETERS, offset, length);
        return;
      case "MULTIPLE_IMPLEMENTS_CLAUSES":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.MULTIPLE_IMPLEMENTS_CLAUSES, offset, length);
        return;
      case "NAMED_FUNCTION_EXPRESSION":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.NAMED_FUNCTION_EXPRESSION, offset, length);
        return;
      case "NAMED_PARAMETER_OUTSIDE_GROUP":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.NAMED_PARAMETER_OUTSIDE_GROUP, offset, length);
        return;
      case "NON_PART_OF_DIRECTIVE_IN_PART":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.NON_PART_OF_DIRECTIVE_IN_PART, offset, length);
        return;
      case "NON_SYNC_FACTORY":
        errorReporter?.reportErrorForOffset(
            CompileTimeErrorCode.NON_SYNC_FACTORY, offset, length);
        return;
      case "POSITIONAL_AFTER_NAMED_ARGUMENT":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.POSITIONAL_AFTER_NAMED_ARGUMENT, offset, length);
        return;
      case "RECURSIVE_CONSTRUCTOR_REDIRECT":
        errorReporter?.reportErrorForOffset(
            CompileTimeErrorCode.RECURSIVE_CONSTRUCTOR_REDIRECT,
            offset,
            length);
        return;
      case "RETURN_IN_GENERATOR":
        errorReporter?.reportErrorForOffset(
            CompileTimeErrorCode.RETURN_IN_GENERATOR, offset, length,
            // TODO(danrubel): Update the parser to report the modifier
            // involved in this error... either async* or sync*
            ['async*']);
        return;
      case "STACK_OVERFLOW":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.STACK_OVERFLOW, offset, length);
        return;
      case "SUPER_IN_REDIRECTING_CONSTRUCTOR":
        errorReporter?.reportErrorForOffset(
            CompileTimeErrorCode.SUPER_IN_REDIRECTING_CONSTRUCTOR,
            offset,
            length);
        return;
      case "TYPE_PARAMETER_ON_CONSTRUCTOR":
        errorReporter?.reportErrorForOffset(
            CompileTimeErrorCode.TYPE_PARAMETER_ON_CONSTRUCTOR, offset, length);
        return;
      case "UNDEFINED_CLASS":
        errorReporter?.reportErrorForOffset(
            CompileTimeErrorCode.UNDEFINED_CLASS, offset, length);
        return;
      case "UNDEFINED_GETTER":
        errorReporter?.reportErrorForOffset(
            StaticTypeWarningCode.UNDEFINED_GETTER, offset, length);
        return;
      case "UNDEFINED_METHOD":
        errorReporter?.reportErrorForOffset(
            StaticTypeWarningCode.UNDEFINED_METHOD, offset, length);
        return;
      case "UNDEFINED_SETTER":
        errorReporter?.reportErrorForOffset(
            StaticTypeWarningCode.UNDEFINED_SETTER, offset, length);
        return;
      case "UNEXPECTED_DOLLAR_IN_STRING":
        errorReporter?.reportErrorForOffset(
            ScannerErrorCode.UNEXPECTED_DOLLAR_IN_STRING, offset, length);
        return;
      case "UNEXPECTED_TOKEN":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.UNEXPECTED_TOKEN, offset, length, [lexeme()]);
        return;
      case "UNTERMINATED_MULTI_LINE_COMMENT":
        errorReporter?.reportErrorForOffset(
            ScannerErrorCode.UNTERMINATED_MULTI_LINE_COMMENT, offset, length);
        return;
      case "UNTERMINATED_STRING_LITERAL":
        errorReporter?.reportErrorForOffset(
            ScannerErrorCode.UNTERMINATED_STRING_LITERAL, offset, length);
        return;
      case "VAR_AND_TYPE":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.VAR_AND_TYPE, offset, length);
        return;
      case "WRONG_NUMBER_OF_PARAMETERS_FOR_SETTER":
        errorReporter?.reportErrorForOffset(
            CompileTimeErrorCode.WRONG_NUMBER_OF_PARAMETERS_FOR_SETTER,
            offset,
            length);
        return;
      case "WRONG_SEPARATOR_FOR_POSITIONAL_PARAMETER":
        errorReporter?.reportErrorForOffset(
            ParserErrorCode.WRONG_SEPARATOR_FOR_POSITIONAL_PARAMETER,
            offset,
            length);
        return;
      case "YIELD_IN_NON_GENERATOR":
        errorReporter?.reportErrorForOffset(
            CompileTimeErrorCode.YIELD_IN_NON_GENERATOR, offset, length);
        return;
      default:
      // fall through
    }
  }

  void reportCompilationMessage(CompilationMessage message) {
    String errorCodeStr = message.analyzerCode;
    ErrorCode errorCode = _getErrorCode(errorCodeStr);
    if (errorCode != null) {
      errorReporter.reportError(new AnalysisError.forValues(
          errorReporter.source,
          message.span.start.offset,
          message.span.length,
          errorCode,
          message.message,
          message.tip));
    } else if (message.severity != Severity.context) {
      // Messages with [Severity.context] are supposed to give extra information
      // to messages of other kinds, and it should be possible to ignore them
      // without affecting the discoverability of compile-time errors.  See also
      // https://github.com/dart-lang/sdk/issues/33730.
      throw new StateError('Unable to convert (${message.code}, $errorCodeStr, '
          '@${message.span.start.offset}, $message)');
    }
  }

  /// Report an error based on the given [message] whose range is described by
  /// the given [offset] and [length].
  void reportMessage(Message message, int offset, int length) {
    Code code = message.code;
    int index = code.index;
    if (index != null && index > 0 && index < fastaAnalyzerErrorCodes.length) {
      ErrorCode errorCode = fastaAnalyzerErrorCodes[index];
      if (errorCode != null) {
        errorReporter.reportError(new AnalysisError.forValues(
            errorReporter.source,
            offset,
            length,
            errorCode,
            message.message,
            message.tip));
        return;
      }
    }
    reportByCode(code.analyzerCode, offset, length, message);
  }

  void reportScannerError(
      ScannerErrorCode errorCode, int offset, List<Object> arguments) {
    // TODO(danrubel): update client to pass length in addition to offset.
    int length = 1;
    errorReporter?.reportErrorForOffset(errorCode, offset, length, arguments);
  }

  void _reportByCode(
      ErrorCode errorCode, Message message, int offset, int length) {
    if (errorReporter != null) {
      errorReporter.reportError(new AnalysisError.forValues(
          errorReporter.source,
          offset,
          length,
          errorCode,
          message.message,
          null));
    }
  }

  /// Return the [ErrorCode] for the given [shortName], or `null` if not found.
  static ErrorCode _getErrorCode(String shortName) {
    const prefixes = const {
      CompileTimeErrorCode: 'CompileTimeErrorCode.',
      StrongModeCode: 'StrongModeCode.STRONG_MODE_',
      ResolverErrorCode: 'ResolverErrorCode.',
      ParserErrorCode: 'ParserErrorCode.',
      ScannerErrorCode: 'ScannerErrorCode.',
      StaticTypeWarningCode: 'StaticTypeWarningCode.',
      StaticWarningCode: 'StaticWarningCode.'
    };
    for (var prefix in prefixes.values) {
      var uniqueName = '$prefix$shortName';
      var errorCode = errorCodeByUniqueName(uniqueName);
      if (errorCode != null) {
        return errorCode;
      }
    }
    return null;
  }
}