// Copyright (c) 2017, 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/dart/ast/ast.dart';
import 'package:analyzer/dart/ast/token.dart' as analyzer;
import 'package:analyzer/dart/ast/token.dart' show Token, TokenType;
import 'package:analyzer/error/error.dart';
import 'package:analyzer/error/listener.dart' show ErrorReporter;
import 'package:analyzer/src/dart/ast/ast.dart';
import 'package:analyzer/src/dart/ast/token.dart';
import 'package:analyzer/src/dart/scanner/scanner.dart';
import 'package:analyzer/src/fasta/ast_builder.dart';
import 'package:analyzer/src/generated/parser.dart' as analyzer;
import 'package:analyzer/src/generated/utilities_dart.dart';
import 'package:analyzer/src/string_source.dart';
import 'package:front_end/src/fasta/scanner.dart'
    show ScannerResult, scanString;
import 'package:front_end/src/fasta/parser/parser.dart' as fasta;
import 'package:front_end/src/fasta/scanner/error_token.dart' show ErrorToken;
import 'package:front_end/src/fasta/scanner/string_scanner.dart';
import 'package:front_end/src/scanner/errors.dart' show translateErrorToken;
import 'package:test/test.dart';
import 'package:test_reflective_loader/test_reflective_loader.dart';

import 'parser_fasta_listener.dart';
import 'parser_test.dart';
import 'test_support.dart';

main() {
  defineReflectiveSuite(() {
    defineReflectiveTests(ClassMemberParserTest_Fasta);
    defineReflectiveTests(ComplexParserTest_Fasta);
    defineReflectiveTests(ErrorParserTest_Fasta);
    defineReflectiveTests(ExpressionParserTest_Fasta);
    defineReflectiveTests(FormalParameterParserTest_Fasta);
    defineReflectiveTests(RecoveryParserTest_Fasta);
    defineReflectiveTests(SimpleParserTest_Fasta);
    defineReflectiveTests(StatementParserTest_Fasta);
    defineReflectiveTests(TopLevelParserTest_Fasta);
  });
}

/**
 * Type of the "parse..." methods defined in the Fasta parser.
 */
typedef analyzer.Token ParseFunction(analyzer.Token token);

@reflectiveTest
class ClassMemberParserTest_Fasta extends FastaParserTestCase
    with ClassMemberParserTestMixin {}

/**
 * Tests of the fasta parser based on [ComplexParserTestMixin].
 */
@reflectiveTest
class ComplexParserTest_Fasta extends FastaParserTestCase
    with ComplexParserTestMixin {}

/**
 * Tests of the fasta parser based on [ErrorParserTest].
 */
@reflectiveTest
class ErrorParserTest_Fasta extends FastaParserTestCase
    with ErrorParserTestMixin {
  @override
  void test_expectedListOrMapLiteral() {
    // The fasta parser returns an 'IntegerLiteralImpl' when parsing '1'.
    // This test is not expected to ever pass.
    //super.test_expectedListOrMapLiteral();
  }

  @override
  void test_expectedStringLiteral() {
    // The fasta parser returns an 'IntegerLiteralImpl' when parsing '1'.
    // This test is not expected to ever pass.
    //super.test_expectedStringLiteral();
  }

  void test_getterNativeWithBody() {
    createParser('String get m native "str" => 0;');
    parser.parseClassMember('C') as MethodDeclaration;
    if (!allowNativeClause) {
      assertErrorsWithCodes([
        ParserErrorCode.NATIVE_CLAUSE_SHOULD_BE_ANNOTATION,
        ParserErrorCode.EXTERNAL_METHOD_WITH_BODY,
      ]);
    } else {
      assertErrorsWithCodes([
        ParserErrorCode.EXTERNAL_METHOD_WITH_BODY,
      ]);
    }
  }

  void test_invalidOperatorAfterSuper_constructorInitializer2() {
    parseCompilationUnit('class C { C() : super?.namedConstructor(); }',
        errors: [
          expectedError(ParserErrorCode.INVALID_OPERATOR_FOR_SUPER, 21, 2)
        ]);
  }
}

/**
 * Tests of the fasta parser based on [ExpressionParserTestMixin].
 */
@reflectiveTest
class ExpressionParserTest_Fasta extends FastaParserTestCase
    with ExpressionParserTestMixin {
  @override
  @failingTest
  void test_parseUnaryExpression_decrement_super() {
    // TODO(danrubel) Reports a different error and different token stream.
    // Expected: TokenType:<MINUS>
    //   Actual: TokenType:<MINUS_MINUS>
    super.test_parseUnaryExpression_decrement_super();
  }

  @override
  @failingTest
  void test_parseUnaryExpression_decrement_super_withComment() {
    // TODO(danrubel) Reports a different error and different token stream.
    // Expected: TokenType:<MINUS>
    //   Actual: TokenType:<MINUS_MINUS>
    super.test_parseUnaryExpression_decrement_super_withComment();
  }
}

/**
 * Implementation of [AbstractParserTestCase] specialized for testing the
 * Fasta parser.
 */
class FastaParserTestCase extends Object
    with ParserTestHelpers
    implements AbstractParserTestCase {
  static final List<ErrorCode> NO_ERROR_COMPARISON = <ErrorCode>[];
  ParserProxy _parserProxy;

  analyzer.Token _fastaTokens;

  @override
  bool allowNativeClause = false;

  @override
  set enableLazyAssignmentOperators(bool value) {
    // Lazy assignment operators are always enabled
  }

  @override
  set enableNnbd(bool value) {
    if (value == true) {
      // TODO(paulberry,ahe): non-null-by-default syntax is not supported by
      // Fasta.
      throw new UnimplementedError();
    }
  }

  set enableOptionalNewAndConst(bool enable) {
    // ignored
  }

  @override
  set enableUriInPartOf(bool value) {
    if (value == false) {
      throw new UnimplementedError(
          'URIs in "part of" declarations cannot be disabled in Fasta.');
    }
  }

  @override
  GatheringErrorListener get listener => _parserProxy._errorListener;

  @override
  analyzer.Parser get parser => _parserProxy;

  @override
  bool get usingFastaParser => true;

  void assertErrors({List<ErrorCode> codes, List<ExpectedError> errors}) {
    if (codes != null) {
      if (!identical(codes, NO_ERROR_COMPARISON)) {
        assertErrorsWithCodes(codes);
      }
    } else if (errors != null) {
      listener.assertErrors(errors);
    } else {
      assertNoErrors();
    }
  }

  @override
  void assertErrorsWithCodes(List<ErrorCode> expectedErrorCodes) {
    _parserProxy._errorListener.assertErrorsWithCodes(
        _toFastaGeneratedAnalyzerErrorCodes(expectedErrorCodes));
  }

  @override
  void assertNoErrors() {
    _parserProxy._errorListener.assertNoErrors();
  }

  @override
  void createParser(String content, {int expectedEndOffset}) {
    var scanner = new StringScanner(content, includeComments: true);
    _fastaTokens = scanner.tokenize();
    _parserProxy = new ParserProxy(_fastaTokens,
        allowNativeClause: allowNativeClause,
        expectedEndOffset: expectedEndOffset);
  }

  @override
  ExpectedError expectedError(ErrorCode code, int offset, int length) =>
      new ExpectedError(
          _toFastaGeneratedAnalyzerErrorCode(code), offset, length);

  @override
  void expectNotNullIfNoErrors(Object result) {
    if (!listener.hasErrors) {
      expect(result, isNotNull);
    }
  }

  @override
  Expression parseAdditiveExpression(String code) {
    return _parseExpression(code);
  }

  Expression parseArgument(String source) {
    createParser(source);
    return _parserProxy.parseArgument();
  }

  @override
  Expression parseAssignableExpression(String code, bool primaryAllowed) {
    return _parseExpression(code);
  }

  @override
  Expression parseAssignableSelector(String code, bool optional,
      {bool allowConditional: true}) {
    if (optional) {
      if (code.isEmpty) {
        return _parseExpression('foo');
      }
      return _parseExpression('(foo)$code');
    }
    return _parseExpression('foo$code');
  }

  @override
  AwaitExpression parseAwaitExpression(String code) {
    var function = _parseExpression('() async => $code') as FunctionExpression;
    return (function.body as ExpressionFunctionBody).expression;
  }

  @override
  Expression parseBitwiseAndExpression(String code) {
    return _parseExpression(code);
  }

  @override
  Expression parseBitwiseOrExpression(String code) {
    return _parseExpression(code);
  }

  @override
  Expression parseBitwiseXorExpression(String code) {
    return _parseExpression(code);
  }

  @override
  Expression parseCascadeSection(String code) {
    var cascadeExpression = _parseExpression('null$code') as CascadeExpression;
    return cascadeExpression.cascadeSections.first;
  }

  CommentReference parseCommentReference(
      String referenceSource, int sourceOffset) {
    String padding = ' '.padLeft(sourceOffset - 4, 'a');
    String source = '/**$padding[$referenceSource] */ class C { }';
    CompilationUnit unit = parseCompilationUnit(source);
    ClassDeclaration clazz = unit.declarations[0];
    Comment comment = clazz.documentationComment;
    List<CommentReference> references = comment.references;
    if (references.isEmpty) {
      return null;
    } else {
      expect(references, hasLength(1));
      return references[0];
    }
  }

  @override
  CompilationUnit parseCompilationUnit(String content,
      {List<ErrorCode> codes, List<ExpectedError> errors}) {
    GatheringErrorListener listener =
        new GatheringErrorListener(checkRanges: true);

    CompilationUnit unit = parseCompilationUnit2(content, listener);

    // Assert and return result
    if (codes != null) {
      listener
          .assertErrorsWithCodes(_toFastaGeneratedAnalyzerErrorCodes(codes));
    } else if (errors != null) {
      listener.assertErrors(errors);
    } else {
      listener.assertNoErrors();
    }
    return unit;
  }

  CompilationUnit parseCompilationUnit2(
      String content, GatheringErrorListener listener) {
    var source = new StringSource(content, 'parser_test_StringSource.dart');

    void reportError(
        ScannerErrorCode errorCode, int offset, List<Object> arguments) {
      listener
          .onError(new AnalysisError(source, offset, 1, errorCode, arguments));
    }

    // Scan tokens
    ScannerResult result = scanString(content, includeComments: true);
    Token token = result.tokens;
    if (result.hasErrors) {
      // The default recovery strategy used by scanString
      // places all error tokens at the head of the stream.
      while (token.type == TokenType.BAD_INPUT) {
        translateErrorToken(token, reportError);
        token = token.next;
      }
    }
    _fastaTokens = token;

    // Run parser
    ErrorReporter errorReporter = new ErrorReporter(listener, source);
    fasta.Parser parser = new fasta.Parser(null);
    AstBuilder astBuilder = new AstBuilder(errorReporter, source.uri, true);
    parser.listener = astBuilder;
    parser.isMixinSupportEnabled = true;
    astBuilder.parser = parser;
    astBuilder.allowNativeClause = allowNativeClause;
    parser.parseUnit(_fastaTokens);
    CompilationUnitImpl unit = astBuilder.pop();
    unit.localDeclarations = astBuilder.localDeclarations;

    expect(unit, isNotNull);
    return unit;
  }

  @override
  ConditionalExpression parseConditionalExpression(String code) {
    return _parseExpression(code);
  }

  @override
  Expression parseConstExpression(String code) {
    return _parseExpression(code);
  }

  @override
  ConstructorInitializer parseConstructorInitializer(String code) {
    createParser('class __Test { __Test() : $code; }');
    CompilationUnit unit = _parserProxy.parseCompilationUnit2();
    assertNoErrors();
    var clazz = unit.declarations[0] as ClassDeclaration;
    var constructor = clazz.members[0] as ConstructorDeclaration;
    return constructor.initializers.single;
  }

  @override
  CompilationUnit parseDirectives(String source,
      [List<ErrorCode> errorCodes = const <ErrorCode>[]]) {
    createParser(source);
    CompilationUnit unit =
        _parserProxy.parseDirectives(_parserProxy.currentToken);
    expect(unit, isNotNull);
    expect(unit.declarations, hasLength(0));
    listener.assertErrorsWithCodes(errorCodes);
    return unit;
  }

  @override
  BinaryExpression parseEqualityExpression(String code) {
    return _parseExpression(code);
  }

  @override
  Expression parseExpression(String source,
      {List<ErrorCode> codes,
      List<ExpectedError> errors,
      int expectedEndOffset}) {
    createParser(source, expectedEndOffset: expectedEndOffset);
    Expression result = _parserProxy.parseExpression2();
    assertErrors(codes: codes, errors: errors);
    return result;
  }

  @override
  List<Expression> parseExpressionList(String code) {
    return (_parseExpression('[$code]') as ListLiteral).elements.toList();
  }

  @override
  Expression parseExpressionWithoutCascade(String code) {
    return _parseExpression(code);
  }

  @override
  FormalParameter parseFormalParameter(String code, ParameterKind kind,
      {List<ErrorCode> errorCodes: const <ErrorCode>[]}) {
    String parametersCode;
    if (kind == ParameterKind.REQUIRED) {
      parametersCode = '($code)';
    } else if (kind == ParameterKind.POSITIONAL) {
      parametersCode = '([$code])';
    } else if (kind == ParameterKind.NAMED) {
      parametersCode = '({$code})';
    } else {
      fail('$kind');
    }
    FormalParameterList list = parseFormalParameterList(parametersCode,
        inFunctionType: false, errorCodes: errorCodes);
    return list.parameters.single;
  }

  @override
  FormalParameterList parseFormalParameterList(String code,
      {bool inFunctionType: false,
      List<ErrorCode> errorCodes: const <ErrorCode>[],
      List<ExpectedError> errors}) {
    createParser(code);
    FormalParameterList result =
        _parserProxy.parseFormalParameterList(inFunctionType: inFunctionType);
    assertErrors(codes: errors != null ? null : errorCodes, errors: errors);
    return result;
  }

  @override
  CompilationUnitMember parseFullCompilationUnitMember() {
    return _parserProxy.parseTopLevelDeclaration(false);
  }

  @override
  Directive parseFullDirective() {
    return _parserProxy.parseTopLevelDeclaration(true);
  }

  @override
  FunctionExpression parseFunctionExpression(String code) {
    return _parseExpression(code);
  }

  @override
  InstanceCreationExpression parseInstanceCreationExpression(
      String code, analyzer.Token newToken) {
    return _parseExpression('$newToken $code');
  }

  @override
  ListLiteral parseListLiteral(
      analyzer.Token token, String typeArgumentsCode, String code) {
    String sc = '';
    if (token != null) {
      sc += token.lexeme + ' ';
    }
    if (typeArgumentsCode != null) {
      sc += typeArgumentsCode;
    }
    sc += code;
    return _parseExpression(sc);
  }

  @override
  TypedLiteral parseListOrMapLiteral(analyzer.Token modifier, String code) {
    String literalCode = modifier != null ? '$modifier $code' : code;
    return parsePrimaryExpression(literalCode) as TypedLiteral;
  }

  @override
  Expression parseLogicalAndExpression(String code) {
    return _parseExpression(code);
  }

  @override
  Expression parseLogicalOrExpression(String code) {
    return _parseExpression(code);
  }

  @override
  MapLiteral parseMapLiteral(
      analyzer.Token token, String typeArgumentsCode, String code) {
    String sc = '';
    if (token != null) {
      sc += token.lexeme + ' ';
    }
    if (typeArgumentsCode != null) {
      sc += typeArgumentsCode;
    }
    sc += code;
    return parsePrimaryExpression(sc) as MapLiteral;
  }

  @override
  MapLiteralEntry parseMapLiteralEntry(String code) {
    var mapLiteral = parseMapLiteral(null, null, '{ $code }');
    return mapLiteral.entries.single;
  }

  @override
  Expression parseMultiplicativeExpression(String code) {
    return _parseExpression(code);
  }

  @override
  InstanceCreationExpression parseNewExpression(String code) {
    return _parseExpression(code);
  }

  @override
  NormalFormalParameter parseNormalFormalParameter(String code,
      {bool inFunctionType: false,
      List<ErrorCode> errorCodes: const <ErrorCode>[]}) {
    FormalParameterList list = parseFormalParameterList('($code)',
        inFunctionType: inFunctionType, errorCodes: errorCodes);
    return list.parameters.single;
  }

  @override
  Expression parsePostfixExpression(String code) {
    return _parseExpression(code);
  }

  @override
  Identifier parsePrefixedIdentifier(String code) {
    return _parseExpression(code);
  }

  @override
  Expression parsePrimaryExpression(String code,
      {int expectedEndOffset, List<ExpectedError> errors}) {
    createParser(code, expectedEndOffset: expectedEndOffset);
    Expression result = _parserProxy.parsePrimaryExpression();
    assertErrors(codes: null, errors: errors);
    return result;
  }

  @override
  Expression parseRelationalExpression(String code) {
    return _parseExpression(code);
  }

  @override
  RethrowExpression parseRethrowExpression(String code) {
    return _parseExpression(code);
  }

  @override
  BinaryExpression parseShiftExpression(String code) {
    return _parseExpression(code);
  }

  @override
  SimpleIdentifier parseSimpleIdentifier(String code) {
    return _parseExpression(code);
  }

  @override
  Statement parseStatement(String source,
      {bool enableLazyAssignmentOperators, int expectedEndOffset}) {
    createParser(source, expectedEndOffset: expectedEndOffset);
    Statement statement = _parserProxy.parseStatement2();
    assertErrors(codes: NO_ERROR_COMPARISON);
    return statement;
  }

  @override
  Expression parseStringLiteral(String code) {
    return _parseExpression(code);
  }

  @override
  SymbolLiteral parseSymbolLiteral(String code) {
    return _parseExpression(code);
  }

  @override
  Expression parseThrowExpression(String code) {
    return _parseExpression(code);
  }

  @override
  Expression parseThrowExpressionWithoutCascade(String code) {
    return _parseExpression(code);
  }

  @override
  PrefixExpression parseUnaryExpression(String code) {
    return _parseExpression(code);
  }

  @override
  VariableDeclarationList parseVariableDeclarationList(String code) {
    var statement = parseStatement('$code;') as VariableDeclarationStatement;
    return statement.variables;
  }

  Expression _parseExpression(String code) {
    var statement = parseStatement('$code;') as ExpressionStatement;
    return statement.expression;
  }

  ErrorCode _toFastaGeneratedAnalyzerErrorCode(ErrorCode code) {
    if (code == ParserErrorCode.ABSTRACT_ENUM ||
        code == ParserErrorCode.ABSTRACT_TOP_LEVEL_FUNCTION ||
        code == ParserErrorCode.ABSTRACT_TOP_LEVEL_VARIABLE ||
        code == ParserErrorCode.ABSTRACT_TYPEDEF ||
        code == ParserErrorCode.CONST_ENUM ||
        code == ParserErrorCode.CONST_TYPEDEF ||
        code == ParserErrorCode.COVARIANT_TOP_LEVEL_DECLARATION ||
        code == ParserErrorCode.FINAL_CLASS ||
        code == ParserErrorCode.FINAL_ENUM ||
        code == ParserErrorCode.FINAL_TYPEDEF ||
        code == ParserErrorCode.STATIC_TOP_LEVEL_DECLARATION)
      return ParserErrorCode.EXTRANEOUS_MODIFIER;
    return code;
  }

  List<ErrorCode> _toFastaGeneratedAnalyzerErrorCodes(
          List<ErrorCode> expectedErrorCodes) =>
      expectedErrorCodes.map(_toFastaGeneratedAnalyzerErrorCode).toList();
}

/**
 * Tests of the fasta parser based on [FormalParameterParserTestMixin].
 */
@reflectiveTest
class FormalParameterParserTest_Fasta extends FastaParserTestCase
    with FormalParameterParserTestMixin {}

/**
 * Proxy implementation of the analyzer parser, implemented in terms of the
 * Fasta parser.
 *
 * This allows many of the analyzer parser tests to be run on Fasta, even if
 * they call into the analyzer parser class directly.
 */
class ParserProxy extends analyzer.ParserAdapter {
  /**
   * The error listener to which scanner and parser errors will be reported.
   */
  final GatheringErrorListener _errorListener;

  ForwardingTestListener _eventListener;

  final int expectedEndOffset;

  /**
   * Creates a [ParserProxy] which is prepared to begin parsing at the given
   * Fasta token.
   */
  factory ParserProxy(analyzer.Token firstToken,
      {bool allowNativeClause: false, int expectedEndOffset}) {
    TestSource source = new TestSource();
    var errorListener = new GatheringErrorListener(checkRanges: true);
    var errorReporter = new ErrorReporter(errorListener, source);
    return new ParserProxy._(firstToken, errorReporter, null, errorListener,
        allowNativeClause: allowNativeClause,
        expectedEndOffset: expectedEndOffset);
  }

  ParserProxy._(analyzer.Token firstToken, ErrorReporter errorReporter,
      Uri fileUri, this._errorListener,
      {bool allowNativeClause: false, this.expectedEndOffset})
      : super(firstToken, errorReporter, fileUri,
            allowNativeClause: allowNativeClause) {
    _eventListener = new ForwardingTestListener(astBuilder);
    fastaParser.listener = _eventListener;
  }

  noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);

  @override
  Annotation parseAnnotation() {
    return _run('MetadataStar', () => super.parseAnnotation());
  }

  @override
  ArgumentList parseArgumentList() {
    return _run('unspecified', () => super.parseArgumentList());
  }

  @override
  ClassMember parseClassMember(String className) {
    return _run('ClassOrMixinBody', () => super.parseClassMember(className));
  }

  List<Combinator> parseCombinators() {
    return _run('Import', () => super.parseCombinators());
  }

  @override
  List<CommentReference> parseCommentReferences(
      List<DocumentationCommentToken> tokens) {
    for (int index = 0; index < tokens.length - 1; ++index) {
      analyzer.Token next = tokens[index].next;
      if (next == null) {
        tokens[index].setNext(tokens[index + 1]);
      } else {
        expect(next, tokens[index + 1]);
      }
    }
    expect(tokens[tokens.length - 1].next, isNull);
    List<CommentReference> references =
        astBuilder.parseCommentReferences(tokens.first);
    if (astBuilder.stack.isNotEmpty) {
      throw 'Expected empty stack, but found:'
          '\n  ${astBuilder.stack.values.join('\n  ')}';
    }
    return references;
  }

  @override
  CompilationUnit parseCompilationUnit2() {
    CompilationUnit result = super.parseCompilationUnit2();
    expect(currentToken.isEof, isTrue, reason: currentToken.lexeme);
    expect(astBuilder.stack, hasLength(0));
    _eventListener.expectEmpty();
    return result;
  }

  @override
  Configuration parseConfiguration() {
    return _run('ConditionalUris', () => super.parseConfiguration());
  }

  @override
  DottedName parseDottedName() {
    return _run('unspecified', () => super.parseDottedName());
  }

  @override
  Expression parseExpression2() {
    return _run('unspecified', () => super.parseExpression2());
  }

  @override
  FormalParameterList parseFormalParameterList({bool inFunctionType: false}) {
    return _run('unspecified',
        () => super.parseFormalParameterList(inFunctionType: inFunctionType));
  }

  @override
  FunctionBody parseFunctionBody(
      bool mayBeEmpty, ParserErrorCode emptyErrorCode, bool inExpression) {
    Token lastToken;
    FunctionBody body = _run('unspecified', () {
      FunctionBody body =
          super.parseFunctionBody(mayBeEmpty, emptyErrorCode, inExpression);
      lastToken = currentToken;
      currentToken = currentToken.next;
      return body;
    });
    if (!inExpression) {
      if (![';', '}'].contains(lastToken.lexeme)) {
        fail('Expected ";" or "}", but found: ${lastToken.lexeme}');
      }
    }
    return body;
  }

  @override
  Expression parsePrimaryExpression() {
    return _run('unspecified', () => super.parsePrimaryExpression());
  }

  @override
  Statement parseStatement(Token token) {
    return _run('unspecified', () => super.parseStatement(token));
  }

  @override
  Statement parseStatement2() {
    return _run('unspecified', () => super.parseStatement2());
  }

  @override
  AnnotatedNode parseTopLevelDeclaration(bool isDirective) {
    return _run(
        'CompilationUnit', () => super.parseTopLevelDeclaration(isDirective));
  }

  @override
  TypeAnnotation parseTypeAnnotation(bool inExpression) {
    return _run('unspecified', () => super.parseTypeAnnotation(inExpression));
  }

  @override
  TypeArgumentList parseTypeArgumentList() {
    return _run('unspecified', () => super.parseTypeArgumentList());
  }

  @override
  TypeName parseTypeName(bool inExpression) {
    return _run('unspecified', () => super.parseTypeName(inExpression));
  }

  @override
  TypeParameter parseTypeParameter() {
    return _run('unspecified', () => super.parseTypeParameter());
  }

  @override
  TypeParameterList parseTypeParameterList() {
    return _run('unspecified', () => super.parseTypeParameterList());
  }

  /**
   * Runs the specified function and returns the result.
   * It checks the enclosing listener events,
   * that the parse consumed all of the tokens,
   * and that the result stack is empty.
   */
  _run(String enclosingEvent, f()) {
    _eventListener.begin(enclosingEvent);
    var result = f();
    _eventListener.end(enclosingEvent);
    String lexeme = currentToken is ErrorToken
        ? currentToken.runtimeType.toString()
        : currentToken.lexeme;
    if (expectedEndOffset == null) {
      expect(currentToken.isEof, isTrue, reason: lexeme);
    } else {
      expect(currentToken.offset, expectedEndOffset, reason: lexeme);
    }
    expect(astBuilder.stack, hasLength(0));
    expect(astBuilder.directives, hasLength(0));
    expect(astBuilder.declarations, hasLength(0));
    return result;
  }
}

@reflectiveTest
class RecoveryParserTest_Fasta extends FastaParserTestCase
    with RecoveryParserTestMixin {
  @override
  void test_equalityExpression_precedence_relational_right() {
    parseExpression("== is", codes: [
      ParserErrorCode.EXPECTED_TYPE_NAME,
      ParserErrorCode.MISSING_IDENTIFIER,
      ParserErrorCode.MISSING_IDENTIFIER
    ]);
  }

  @override
  void test_relationalExpression_missing_LHS_RHS() {
    parseExpression("is", codes: [
      ParserErrorCode.EXPECTED_TYPE_NAME,
      ParserErrorCode.MISSING_IDENTIFIER
    ]);
  }

  @override
  void test_relationalExpression_precedence_shift_right() {
    parseExpression("<< is", codes: [
      ParserErrorCode.EXPECTED_TYPE_NAME,
      ParserErrorCode.MISSING_IDENTIFIER,
      ParserErrorCode.MISSING_IDENTIFIER
    ]);
  }
}

@reflectiveTest
class SimpleParserTest_Fasta extends FastaParserTestCase
    with SimpleParserTestMixin {
  test_parseArgument() {
    Expression result = parseArgument('3');
    expect(result, const TypeMatcher<IntegerLiteral>());
    IntegerLiteral literal = result;
    expect(literal.value, 3);
  }

  test_parseArgument_named() {
    Expression result = parseArgument('foo: "a"');
    expect(result, const TypeMatcher<NamedExpression>());
    NamedExpression expression = result;
    StringLiteral literal = expression.expression;
    expect(literal.stringValue, 'a');
  }

  @failingTest
  @override
  void test_parseCommentReferences_skipLink_direct_multiLine() =>
      super.test_parseCommentReferences_skipLink_direct_multiLine();

  @failingTest
  @override
  void test_parseCommentReferences_skipLink_reference_multiLine() =>
      super.test_parseCommentReferences_skipLink_reference_multiLine();
}

/**
 * Tests of the fasta parser based on [StatementParserTestMixin].
 */
@reflectiveTest
class StatementParserTest_Fasta extends FastaParserTestCase
    with StatementParserTestMixin {}

/**
 * Tests of the fasta parser based on [TopLevelParserTestMixin].
 */
@reflectiveTest
class TopLevelParserTest_Fasta extends FastaParserTestCase
    with TopLevelParserTestMixin {
  void test_parseClassDeclaration_native_allowed() {
    allowNativeClause = true;
    test_parseClassDeclaration_native();
  }

  void test_parseClassDeclaration_native_allowedWithFields() {
    allowNativeClause = true;
    createParser(r'''
class A native 'something' {
  final int x;
  A() {}
}
''');
    CompilationUnitMember member = parseFullCompilationUnitMember();
    expect(member, isNotNull);
    assertNoErrors();
  }

  void test_parseClassDeclaration_native_missing_literal() {
    createParser('class A native {}');
    CompilationUnitMember member = parseFullCompilationUnitMember();
    expect(member, isNotNull);
    if (allowNativeClause) {
      assertNoErrors();
    } else {
      assertErrorsWithCodes([
        ParserErrorCode.NATIVE_CLAUSE_SHOULD_BE_ANNOTATION,
      ]);
    }
    expect(member, new TypeMatcher<ClassDeclaration>());
    ClassDeclaration declaration = member;
    expect(declaration.nativeClause, isNotNull);
    expect(declaration.nativeClause.nativeKeyword, isNotNull);
    expect(declaration.nativeClause.name, isNull);
    expect(declaration.endToken.type, TokenType.CLOSE_CURLY_BRACKET);
  }

  void test_parseClassDeclaration_native_missing_literal_allowed() {
    allowNativeClause = true;
    test_parseClassDeclaration_native_missing_literal();
  }

  void test_parseClassDeclaration_native_missing_literal_not_allowed() {
    allowNativeClause = false;
    test_parseClassDeclaration_native_missing_literal();
  }

  void test_parseClassDeclaration_native_not_allowed() {
    allowNativeClause = false;
    test_parseClassDeclaration_native();
  }

  void test_parseMixinDeclaration_empty() {
    createParser('mixin A {}');
    _parserProxy.fastaParser.isMixinSupportEnabled = true;
    MixinDeclaration declaration = parseFullCompilationUnitMember();
    expect(declaration, isNotNull);
    assertNoErrors();
    expect(declaration.metadata, isEmpty);
    expect(declaration.documentationComment, isNull);
    expect(declaration.onClause, isNull);
    expect(declaration.implementsClause, isNull);
    expect(declaration.mixinKeyword, isNotNull);
    expect(declaration.leftBracket, isNotNull);
    expect(declaration.name.name, 'A');
    expect(declaration.members, hasLength(0));
    expect(declaration.rightBracket, isNotNull);
    expect(declaration.typeParameters, isNull);
  }

  void test_parseMixinDeclaration_implements() {
    createParser('mixin A implements B {}');
    _parserProxy.fastaParser.isMixinSupportEnabled = true;
    MixinDeclaration declaration = parseFullCompilationUnitMember();
    expect(declaration, isNotNull);
    assertNoErrors();
    expect(declaration.metadata, isEmpty);
    expect(declaration.documentationComment, isNull);
    expect(declaration.onClause, isNull);
    ImplementsClause implementsClause = declaration.implementsClause;
    expect(implementsClause.implementsKeyword, isNotNull);
    NodeList<TypeName> interfaces = implementsClause.interfaces;
    expect(interfaces, hasLength(1));
    expect(interfaces[0].name.name, 'B');
    expect(interfaces[0].typeArguments, isNull);
    expect(declaration.mixinKeyword, isNotNull);
    expect(declaration.leftBracket, isNotNull);
    expect(declaration.name.name, 'A');
    expect(declaration.members, hasLength(0));
    expect(declaration.rightBracket, isNotNull);
    expect(declaration.typeParameters, isNull);
  }

  void test_parseMixinDeclaration_implements2() {
    createParser('mixin A implements B<T>, C {}');
    _parserProxy.fastaParser.isMixinSupportEnabled = true;
    MixinDeclaration declaration = parseFullCompilationUnitMember();
    expect(declaration, isNotNull);
    assertNoErrors();
    expect(declaration.metadata, isEmpty);
    expect(declaration.documentationComment, isNull);
    expect(declaration.onClause, isNull);
    ImplementsClause implementsClause = declaration.implementsClause;
    expect(implementsClause.implementsKeyword, isNotNull);
    NodeList<TypeName> interfaces = implementsClause.interfaces;
    expect(interfaces, hasLength(2));
    expect(interfaces[0].name.name, 'B');
    expect(interfaces[0].typeArguments.arguments, hasLength(1));
    expect(interfaces[1].name.name, 'C');
    expect(interfaces[1].typeArguments, isNull);
    expect(declaration.mixinKeyword, isNotNull);
    expect(declaration.leftBracket, isNotNull);
    expect(declaration.name.name, 'A');
    expect(declaration.members, hasLength(0));
    expect(declaration.rightBracket, isNotNull);
    expect(declaration.typeParameters, isNull);
  }

  void test_parseMixinDeclaration_metadata() {
    createParser('@Z mixin A {}');
    _parserProxy.fastaParser.isMixinSupportEnabled = true;
    MixinDeclaration declaration = parseFullCompilationUnitMember();
    expect(declaration, isNotNull);
    assertNoErrors();
    NodeList<Annotation> metadata = declaration.metadata;
    expect(metadata, hasLength(1));
    expect(metadata[0].name.name, 'Z');
    expect(declaration.documentationComment, isNull);
    expect(declaration.onClause, isNull);
    expect(declaration.implementsClause, isNull);
    expect(declaration.mixinKeyword, isNotNull);
    expect(declaration.leftBracket, isNotNull);
    expect(declaration.name.name, 'A');
    expect(declaration.members, hasLength(0));
    expect(declaration.rightBracket, isNotNull);
    expect(declaration.typeParameters, isNull);
  }

  void test_parseMixinDeclaration_on() {
    createParser('mixin A on B {}');
    _parserProxy.fastaParser.isMixinSupportEnabled = true;
    MixinDeclaration declaration = parseFullCompilationUnitMember();
    expect(declaration, isNotNull);
    assertNoErrors();
    expect(declaration.metadata, isEmpty);
    expect(declaration.documentationComment, isNull);
    OnClause onClause = declaration.onClause;
    expect(onClause.onKeyword, isNotNull);
    NodeList<TypeName> constraints = onClause.superclassConstraints;
    expect(constraints, hasLength(1));
    expect(constraints[0].name.name, 'B');
    expect(constraints[0].typeArguments, isNull);
    expect(declaration.implementsClause, isNull);
    expect(declaration.mixinKeyword, isNotNull);
    expect(declaration.leftBracket, isNotNull);
    expect(declaration.name.name, 'A');
    expect(declaration.members, hasLength(0));
    expect(declaration.rightBracket, isNotNull);
    expect(declaration.typeParameters, isNull);
  }

  void test_parseMixinDeclaration_on2() {
    createParser('mixin A on B, C<T> {}');
    _parserProxy.fastaParser.isMixinSupportEnabled = true;
    MixinDeclaration declaration = parseFullCompilationUnitMember();
    expect(declaration, isNotNull);
    assertNoErrors();
    expect(declaration.metadata, isEmpty);
    expect(declaration.documentationComment, isNull);
    OnClause onClause = declaration.onClause;
    expect(onClause.onKeyword, isNotNull);
    NodeList<TypeName> constraints = onClause.superclassConstraints;
    expect(constraints, hasLength(2));
    expect(constraints[0].name.name, 'B');
    expect(constraints[0].typeArguments, isNull);
    expect(constraints[1].name.name, 'C');
    expect(constraints[1].typeArguments.arguments, hasLength(1));
    expect(declaration.implementsClause, isNull);
    expect(declaration.mixinKeyword, isNotNull);
    expect(declaration.leftBracket, isNotNull);
    expect(declaration.name.name, 'A');
    expect(declaration.members, hasLength(0));
    expect(declaration.rightBracket, isNotNull);
    expect(declaration.typeParameters, isNull);
  }

  void test_parseMixinDeclaration_onAndImplements() {
    createParser('mixin A on B implements C {}');
    _parserProxy.fastaParser.isMixinSupportEnabled = true;
    MixinDeclaration declaration = parseFullCompilationUnitMember();
    expect(declaration, isNotNull);
    assertNoErrors();
    expect(declaration.metadata, isEmpty);
    expect(declaration.documentationComment, isNull);
    OnClause onClause = declaration.onClause;
    expect(onClause.onKeyword, isNotNull);
    NodeList<TypeName> constraints = onClause.superclassConstraints;
    expect(constraints, hasLength(1));
    expect(constraints[0].name.name, 'B');
    expect(constraints[0].typeArguments, isNull);
    ImplementsClause implementsClause = declaration.implementsClause;
    expect(implementsClause.implementsKeyword, isNotNull);
    NodeList<TypeName> interfaces = implementsClause.interfaces;
    expect(interfaces, hasLength(1));
    expect(interfaces[0].name.name, 'C');
    expect(interfaces[0].typeArguments, isNull);
    expect(declaration.mixinKeyword, isNotNull);
    expect(declaration.leftBracket, isNotNull);
    expect(declaration.name.name, 'A');
    expect(declaration.members, hasLength(0));
    expect(declaration.rightBracket, isNotNull);
    expect(declaration.typeParameters, isNull);
  }

  void test_parseMixinDeclaration_simple() {
    createParser('''
mixin A {
  int f;
  int get g => f;
  set s(int v) {f = v;}
  int add(int v) => f = f + v;
}''');
    _parserProxy.fastaParser.isMixinSupportEnabled = true;
    MixinDeclaration declaration = parseFullCompilationUnitMember();
    expect(declaration, isNotNull);
    assertNoErrors();
    expect(declaration.metadata, isEmpty);
    expect(declaration.documentationComment, isNull);
    expect(declaration.onClause, isNull);
    expect(declaration.implementsClause, isNull);
    expect(declaration.mixinKeyword, isNotNull);
    expect(declaration.leftBracket, isNotNull);
    expect(declaration.name.name, 'A');
    expect(declaration.members, hasLength(4));
    expect(declaration.rightBracket, isNotNull);
    expect(declaration.typeParameters, isNull);
  }

  void test_parseMixinDeclaration_withDocumentationComment() {
    createParser('/// Doc\nmixin M {}');
    _parserProxy.fastaParser.isMixinSupportEnabled = true;
    MixinDeclaration declaration = parseFullCompilationUnitMember();
    expectCommentText(declaration.documentationComment, '/// Doc');
  }
}