Exemple #1
0
        public override bool Equals(object obj)
        {
            HelperCodeGenerator other = obj as HelperCodeGenerator;

            return(other != null &&
                   base.Equals(other) &&
                   HeaderComplete == other.HeaderComplete &&
                   Equals(Signature, other.Signature));
        }
        protected virtual void HelperDirective()
        {
            bool nested = Context.IsWithin(BlockType.Helper);

            // Set the block and span type
            Context.CurrentBlock.Type = BlockType.Helper;

            // Verify we're on "helper" and accept
            AssertDirective(SyntaxConstants.CSharp.HelperKeyword);
            Block block = new Block(CurrentSymbol.Content.ToString().ToLowerInvariant(), CurrentLocation);
            AcceptAndMoveNext();

            if (nested)
            {
                Context.OnError(CurrentLocation, RazorResources.ParseError_Helpers_Cannot_Be_Nested);
            }

            // Accept a single whitespace character if present, if not, we should stop now
            if (!At(CSharpSymbolType.WhiteSpace))
            {
                string error;
                if (At(CSharpSymbolType.NewLine))
                {
                    error = RazorResources.ErrorComponent_Newline;
                }
                else if (EndOfFile)
                {
                    error = RazorResources.ErrorComponent_EndOfFile;
                }
                else
                {
                    error = String.Format(CultureInfo.CurrentCulture, RazorResources.ErrorComponent_Character, CurrentSymbol.Content);
                }

                Context.OnError(
                    CurrentLocation,
                    RazorResources.ParseError_Unexpected_Character_At_Helper_Name_Start,
                    error);
                PutCurrentBack();
                Output(SpanKind.MetaCode);
                return;
            }

            CSharpSymbol remainingWs = AcceptSingleWhiteSpaceCharacter();

            // Output metacode and continue
            Output(SpanKind.MetaCode);
            if (remainingWs != null)
            {
                Accept(remainingWs);
            }
            AcceptWhile(IsSpacingToken(includeNewLines: false, includeComments: true)); // Don't accept newlines.

            // Expecting an identifier (helper name)
            bool errorReported = !Required(CSharpSymbolType.Identifier, errorIfNotFound: true, errorBase: RazorResources.ParseError_Unexpected_Character_At_Helper_Name_Start);
            if (!errorReported)
            {
                Assert(CSharpSymbolType.Identifier);
                AcceptAndMoveNext();
            }

            AcceptWhile(IsSpacingToken(includeNewLines: false, includeComments: true));

            // Expecting parameter list start: "("
            SourceLocation bracketErrorPos = CurrentLocation;
            if (!Optional(CSharpSymbolType.LeftParenthesis))
            {
                if (!errorReported)
                {
                    errorReported = true;
                    Context.OnError(
                        CurrentLocation,
                        RazorResources.ParseError_MissingCharAfterHelperName,
                        "(");
                }
            }
            else
            {
                SourceLocation bracketStart = CurrentLocation;
                if (!Balance(BalancingModes.NoErrorOnFailure,
                             CSharpSymbolType.LeftParenthesis,
                             CSharpSymbolType.RightParenthesis,
                             bracketStart))
                {
                    errorReported = true;
                    Context.OnError(
                        bracketErrorPos,
                        RazorResources.ParseError_UnterminatedHelperParameterList);
                }
                Optional(CSharpSymbolType.RightParenthesis);
            }

            int bookmark = CurrentLocation.AbsoluteIndex;
            IEnumerable<CSharpSymbol> ws = ReadWhile(IsSpacingToken(includeNewLines: true, includeComments: true));

            // Expecting a "{"
            SourceLocation errorLocation = CurrentLocation;
            bool headerComplete = At(CSharpSymbolType.LeftBrace);
            if (headerComplete)
            {
                Accept(ws);
                AcceptAndMoveNext();
            }
            else
            {
                Context.Source.Position = bookmark;
                NextToken();
                AcceptWhile(IsSpacingToken(includeNewLines: false, includeComments: true));
                if (!errorReported)
                {
                    Context.OnError(
                        errorLocation,
                        RazorResources.ParseError_MissingCharAfterHelperParameters,
                        Language.GetSample(CSharpSymbolType.LeftBrace));
                }
            }

            // Grab the signature and build the code generator
            AddMarkerSymbolIfNecessary();
            LocationTagged<string> signature = Span.GetContent();
            HelperCodeGenerator blockGen = new HelperCodeGenerator(signature, headerComplete);
            Context.CurrentBlock.CodeGenerator = blockGen;

            // The block will generate appropriate code, 
            Span.CodeGenerator = SpanCodeGenerator.Null;

            if (!headerComplete)
            {
                CompleteBlock();
                Output(SpanKind.Code);
                return;
            }
            else
            {
                Span.EditHandler.AcceptedCharacters = AcceptedCharacters.None;
                Output(SpanKind.Code);
            }

            // We're valid, so parse the nested block
            AutoCompleteEditHandler bodyEditHandler = new AutoCompleteEditHandler(Language.TokenizeString);
            using (PushSpanConfig(DefaultSpanConfig))
            {
                using (Context.StartBlock(BlockType.Statement))
                {
                    Span.EditHandler = bodyEditHandler;
                    CodeBlock(false, block);
                    CompleteBlock(insertMarkerIfNecessary: true);
                    Output(SpanKind.Code);
                }
            }
            Initialize(Span);

            EnsureCurrent();

            Span.CodeGenerator = SpanCodeGenerator.Null; // The block will generate the footer code.
            if (!Optional(CSharpSymbolType.RightBrace))
            {
                // The } is missing, so set the initial signature span to use it as an autocomplete string
                bodyEditHandler.AutoCompleteString = "}";

                // Need to be able to accept anything to properly handle the autocomplete
                bodyEditHandler.AcceptedCharacters = AcceptedCharacters.Any;
            }
            else
            {
                blockGen.Footer = Span.GetContent();
                Span.EditHandler.AcceptedCharacters = AcceptedCharacters.None;
            }
            CompleteBlock();
            Output(SpanKind.Code);
        }