C# CodeGeneratorContext.BufferStatementFragment方法代码示例

        public override void GenerateCode(Span target, CodeGeneratorContext context)
        {
            // We parsed: "@contentType Text.Html"
            // And we assigned this code generator to the "Text.Html" part
            // So this node's content should be "Text.Html"
            string contentType = target.Content;

            // The final code we want is something like
            // Response.ContentType = ContentTypes.Text.Html;

            // So, we start by injecting the "prolog" (this is compiler speak for the stuff before the user code)
            context.BufferStatementFragment("Response.ContentType = ContentTypes.");

            // Now we tell the code generator infrastructure that we're at the start of user code
            // This allows us to inject markers so the editor can light up.
            context.MarkStartOfGeneratedCode();

            // Here's our user code!
            context.BufferStatementFragment(contentType);

            // And we tell Razor we're finished with user code, again for the editor
            context.MarkEndOfGeneratedCode();

            // Finally, we inject the "epilog" (compiler speak for stuff after the user code)
            context.BufferStatementFragment(";");

            // And output the whole statement to the generated Execute method
            context.FlushBufferedStatement();
        }

		public override void GenerateStartBlockCode (Block target, CodeGeneratorContext context)
		{
			if (context.Host.DesignTimeMode)
				return;

			Block child = target.Children.Where (n => n.IsBlock).Cast<Block> ().FirstOrDefault ();
			isExpression = child != null && child.Type == BlockType.Expression;

			var sb = new StringBuilder ();
			sb.Append (", Tuple.Create<string,object,bool> (");
			sb.WriteCStyleStringLiteral (Prefix.Value);
			sb.Append (", ");

			if (isExpression) {
				oldRenderingMode = context.GetExpressionRenderingMode ();
				context.SetExpressionRenderingMode (ExpressionRenderingMode.InjectCode);
			} else {
				sb.AppendFormat (
					"new {0} ({1} => {{",
					context.Host.GeneratedClassContext.TemplateTypeName,
					ValueWriterName);
			}

			context.MarkEndOfGeneratedCode ();
			context.BufferStatementFragment (sb.ToString ());

			oldTargetWriter = context.TargetWriterName;
			context.TargetWriterName = ValueWriterName;
		}

        public override void GenerateEndBlockCode(Block target, CodeGeneratorContext context)
        {
            string endBlock = context.BuildCodeString(cw =>
            {
                if (context.ExpressionRenderingMode == ExpressionRenderingMode.WriteToOutput)
                {
                    if (!context.Host.DesignTimeMode)
                    {
                        cw.WriteEndMethodInvoke();
                    }
                    cw.WriteEndStatement();
                }
                else
                {
                    cw.WriteLineContinuation();
                }
            });

            context.MarkEndOfGeneratedCode();
            context.BufferStatementFragment(endBlock);
            context.FlushBufferedStatement();

            if (context.Host.EnableInstrumentation && context.ExpressionRenderingMode == ExpressionRenderingMode.WriteToOutput)
            {
                Span contentSpan = target.Children
                    .OfType<Span>()
                    .Where(s => s.Kind == SpanKind.Code || s.Kind == SpanKind.Markup)
                    .FirstOrDefault();

                if (contentSpan != null)
                {
                    context.AddContextCall(contentSpan, context.Host.GeneratedClassContext.EndContextMethodName, false);
                }
            }
        }

		public override void GenerateCode (Span target, CodeGeneratorContext context)
		{
			if (context.Host.DesignTimeMode)
				return;

			ExpressionRenderingMode oldMode = context.GetExpressionRenderingMode ();

			var sb = new StringBuilder ();
			sb.Append (", Tuple.Create<string,object,bool> (");
			sb.WriteCStyleStringLiteral (Prefix.Value);
			sb.Append (", ");

			if (ValueGenerator != null) {
				context.SetExpressionRenderingMode (ExpressionRenderingMode.InjectCode);
			} else {
				sb.WriteCStyleStringLiteral (Value);
				sb.Append (", true)");
			}
			context.BufferStatementFragment (sb.ToString ());

			if (ValueGenerator != null) {
				ValueGenerator.Value.GenerateCode (target, context);
				context.FlushBufferedStatement ();
				context.SetExpressionRenderingMode (oldMode);
				context.AddStatement (", false)");
			} else {
				context.FlushBufferedStatement ();
			}
		}

 public override void GenerateStartBlockCode(Block target, CodeGeneratorContext context)
 {
     // Flush the buffered statement since we're interrupting it with a comment.
     if (!String.IsNullOrEmpty(context.CurrentBufferedStatement))
     {
         context.MarkEndOfGeneratedCode();
         context.BufferStatementFragment(context.BuildCodeString(cw => cw.WriteLineContinuation()));
     }
     context.FlushBufferedStatement();
 }

        public override void GenerateCode(Span target, CodeGeneratorContext context)
        {
            if (context.Host.DesignTimeMode)
            {
                return;
            }
            ExpressionRenderingMode oldMode = context.ExpressionRenderingMode;
            context.BufferStatementFragment(context.BuildCodeString(cw =>
            {
                cw.WriteParameterSeparator();
                cw.WriteStartMethodInvoke("Tuple.Create");
                cw.WriteLocationTaggedString(Prefix);
                cw.WriteParameterSeparator();
                if (ValueGenerator != null)
                {
                    cw.WriteStartMethodInvoke("Tuple.Create", "System.Object", "System.Int32");
                    context.ExpressionRenderingMode = ExpressionRenderingMode.InjectCode;
                }
                else
                {
                    cw.WriteLocationTaggedString(Value);
                    cw.WriteParameterSeparator();
                    // literal: true - This attribute value is a literal value
                    cw.WriteBooleanLiteral(true);
                    cw.WriteEndMethodInvoke();

                    // In VB, we need a line continuation
                    cw.WriteLineContinuation();
                }
            }));
            if (ValueGenerator != null)
            {
                ValueGenerator.Value.GenerateCode(target, context);
                context.FlushBufferedStatement();
                context.ExpressionRenderingMode = oldMode;
                context.AddStatement(context.BuildCodeString(cw =>
                {
                    cw.WriteParameterSeparator();
                    cw.WriteSnippet(ValueGenerator.Location.AbsoluteIndex.ToString(CultureInfo.CurrentCulture));
                    cw.WriteEndMethodInvoke();
                    cw.WriteParameterSeparator();
                    // literal: false - This attribute value is not a literal value, it is dynamically generated
                    cw.WriteBooleanLiteral(false);
                    cw.WriteEndMethodInvoke();

                    // In VB, we need a line continuation
                    cw.WriteLineContinuation();
                }));
            }
            else
            {
                context.FlushBufferedStatement();
            }
        }

        public override void GenerateEndBlockCode(Block target, CodeGeneratorContext context)
        {
            string generatedCode = context.BuildCodeString(cw =>
            {
                cw.WriteEndLambdaDelegate();
                cw.WriteEndConstructor();
                cw.WriteEndLambdaExpression();
            });

            context.BufferStatementFragment(generatedCode);
            context.TargetWriterName = _oldTargetWriter;
        }

        public override void GenerateStartBlockCode(Block target, CodeGeneratorContext context)
        {
            string generatedCode = context.BuildCodeString(cw =>
            {
                cw.WriteStartLambdaExpression(ItemParameterName);
                cw.WriteStartConstructor(context.Host.GeneratedClassContext.TemplateTypeName);
                cw.WriteStartLambdaDelegate(TemplateWriterName);
            });

            context.MarkEndOfGeneratedCode();
            context.BufferStatementFragment(generatedCode);
            context.FlushBufferedStatement();

            _oldTargetWriter = context.TargetWriterName;
            context.TargetWriterName = TemplateWriterName;
        }

        public override void GenerateStartBlockCode(Block target, CodeGeneratorContext context)
        {
            if (context.Host.DesignTimeMode)
            {
                return; // Don't generate anything!
            }

            // What kind of block is nested within
            string generatedCode;
            Block child = target.Children.Where(n => n.IsBlock).Cast<Block>().FirstOrDefault();
            if (child != null && child.Type == BlockType.Expression)
            {
                _isExpression = true;
                generatedCode = context.BuildCodeString(cw =>
                {
                    cw.WriteParameterSeparator();
                    cw.WriteStartMethodInvoke("Tuple.Create");
                    cw.WriteLocationTaggedString(Prefix);
                    cw.WriteParameterSeparator();
                    cw.WriteStartMethodInvoke("Tuple.Create", "System.Object", "System.Int32");
                });

                _oldRenderingMode = context.ExpressionRenderingMode;
                context.ExpressionRenderingMode = ExpressionRenderingMode.InjectCode;
            }
            else
            {
                generatedCode = context.BuildCodeString(cw =>
                {
                    cw.WriteParameterSeparator();
                    cw.WriteStartMethodInvoke("Tuple.Create");
                    cw.WriteLocationTaggedString(Prefix);
                    cw.WriteParameterSeparator();
                    cw.WriteStartMethodInvoke("Tuple.Create", "System.Object", "System.Int32");
                    cw.WriteStartConstructor(context.Host.GeneratedClassContext.TemplateTypeName);
                    cw.WriteStartLambdaDelegate(ValueWriterName);
                });
            }

            context.MarkEndOfGeneratedCode();
            context.BufferStatementFragment(generatedCode);

            _oldTargetWriter = context.TargetWriterName;
            context.TargetWriterName = ValueWriterName;
        }

        public override void GenerateStartBlockCode(Block target, CodeGeneratorContext context)
        {
            if (context.Host.EnableInstrumentation && context.ExpressionRenderingMode == ExpressionRenderingMode.WriteToOutput)
            {
                Span contentSpan = target.Children
                    .OfType<Span>()
                    .Where(s => s.Kind == SpanKind.Code || s.Kind == SpanKind.Markup)
                    .FirstOrDefault();

                if (contentSpan != null)
                {
                    context.AddContextCall(contentSpan, context.Host.GeneratedClassContext.BeginContextMethodName, false);
                }
            }

            string writeInvocation = context.BuildCodeString(cw =>
            {
                if (context.Host.DesignTimeMode)
                {
                    context.EnsureExpressionHelperVariable();
                    cw.WriteStartAssignment("__o");
                }
                else if (context.ExpressionRenderingMode == ExpressionRenderingMode.WriteToOutput)
                {
                    if (!String.IsNullOrEmpty(context.TargetWriterName))
                    {
                        cw.WriteStartMethodInvoke(context.Host.GeneratedClassContext.WriteToMethodName);
                        cw.WriteSnippet(context.TargetWriterName);
                        cw.WriteParameterSeparator();
                    }
                    else
                    {
                        cw.WriteStartMethodInvoke(context.Host.GeneratedClassContext.WriteMethodName);
                    }
                }
            });

            context.BufferStatementFragment(writeInvocation);
            context.MarkStartOfGeneratedCode();
        }

 public override void GenerateCode(Span target, CodeGeneratorContext context)
 {
     Span sourceSpan = null;
     if (context.CreateCodeWriter().SupportsMidStatementLinePragmas || context.ExpressionRenderingMode == ExpressionRenderingMode.WriteToOutput)
     {
         sourceSpan = target;
     }
     context.BufferStatementFragment(target.Content, sourceSpan);
 }

        public override void GenerateCode(Span target, CodeGeneratorContext context)
        {
            // Check if the host supports it
            if (String.IsNullOrEmpty(context.Host.GeneratedClassContext.ResolveUrlMethodName))
            {
                // Nope, just use the default MarkupCodeGenerator behavior
                new MarkupCodeGenerator().GenerateCode(target, context);
                return;
            }

            if (!context.Host.DesignTimeMode && String.IsNullOrEmpty(target.Content))
            {
                return;
            }

            if (context.Host.EnableInstrumentation && context.ExpressionRenderingMode == ExpressionRenderingMode.WriteToOutput)
            {
                // Add a non-literal context call (non-literal because the expanded URL will not match the source character-by-character)
                context.AddContextCall(target, context.Host.GeneratedClassContext.BeginContextMethodName, isLiteral: false);
            }

            if (!String.IsNullOrEmpty(target.Content) && !context.Host.DesignTimeMode)
            {
                string code = context.BuildCodeString(cw =>
                {
                    if (context.ExpressionRenderingMode == ExpressionRenderingMode.WriteToOutput)
                    {
                        if (!String.IsNullOrEmpty(context.TargetWriterName))
                        {
                            cw.WriteStartMethodInvoke(context.Host.GeneratedClassContext.WriteLiteralToMethodName);
                            cw.WriteSnippet(context.TargetWriterName);
                            cw.WriteParameterSeparator();
                        }
                        else
                        {
                            cw.WriteStartMethodInvoke(context.Host.GeneratedClassContext.WriteLiteralMethodName);
                        }
                    }
                    cw.WriteStartMethodInvoke(context.Host.GeneratedClassContext.ResolveUrlMethodName);
                    cw.WriteStringLiteral(target.Content);
                    cw.WriteEndMethodInvoke();

                    if (context.ExpressionRenderingMode == ExpressionRenderingMode.WriteToOutput)
                    {
                        cw.WriteEndMethodInvoke();
                        cw.WriteEndStatement();
                    }
                    else
                    {
                        cw.WriteLineContinuation();
                    }
                });
                if (context.ExpressionRenderingMode == ExpressionRenderingMode.WriteToOutput)
                {
                    context.AddStatement(code);
                }
                else
                {
                    context.BufferStatementFragment(code);
                }
            }

            if (context.Host.EnableInstrumentation && context.ExpressionRenderingMode == ExpressionRenderingMode.WriteToOutput)
            {
                context.AddContextCall(target, context.Host.GeneratedClassContext.EndContextMethodName, isLiteral: false);
            }
        }