56 lines
2.1 KiB
C#
56 lines
2.1 KiB
C#
// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
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using System;
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using System.Diagnostics;
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using System.Linq;
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using Microsoft.AspNet.Razor.Editor;
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using Microsoft.AspNet.Razor.Generator;
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using Microsoft.AspNet.Razor.Parser.SyntaxTree;
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using Microsoft.AspNet.Razor.Text;
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using Microsoft.AspNet.Razor.Tokenizer;
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namespace Microsoft.AspNet.Razor.Parser
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{
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internal class ConditionalAttributeCollapser : MarkupRewriter
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{
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public ConditionalAttributeCollapser(Action<SpanBuilder, SourceLocation, string> markupSpanFactory) : base(markupSpanFactory)
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{
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}
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protected override bool CanRewrite(Block block)
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{
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AttributeBlockCodeGenerator gen = block.CodeGenerator as AttributeBlockCodeGenerator;
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return gen != null && block.Children.Any() && block.Children.All(IsLiteralAttributeValue);
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}
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protected override SyntaxTreeNode RewriteBlock(BlockBuilder parent, Block block)
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{
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// Collect the content of this node
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string content = String.Concat(block.Children.Cast<Span>().Select(s => s.Content));
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// Create a new span containing this content
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SpanBuilder span = new SpanBuilder();
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span.EditHandler = new SpanEditHandler(HtmlTokenizer.Tokenize);
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FillSpan(span, block.Children.Cast<Span>().First().Start, content);
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return span.Build();
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}
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private bool IsLiteralAttributeValue(SyntaxTreeNode node)
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{
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if (node.IsBlock)
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{
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return false;
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}
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Span span = node as Span;
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Debug.Assert(span != null);
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LiteralAttributeCodeGenerator litGen = span.CodeGenerator as LiteralAttributeCodeGenerator;
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return span != null &&
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((litGen != null && litGen.ValueGenerator == null) ||
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span.CodeGenerator == SpanCodeGenerator.Null ||
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span.CodeGenerator is MarkupCodeGenerator);
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}
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}
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}
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