public void ConstructorTransfersChildrenFromBlockBuilder()
{
// Arrange
var expected = new SpanBuilder(SourceLocation.Undefined)
{
Kind = SpanKindInternal.Code
}.Build();
var builder = new BlockBuilder()
{
Type = BlockKindInternal.Statement
};
builder.Children.Add(expected);
// Act
var block = builder.Build();
// Assert
Assert.Same(expected, block.Children.Single());
}
public void ConstructorWithBlockBuilderSetsParent()
{
// Arrange
var builder = new BlockBuilder()
{
Type = BlockKindInternal.Comment
};
var span = new SpanBuilder(SourceLocation.Undefined)
{
Kind = SpanKindInternal.Code
}.Build();
builder.Children.Add(span);
// Act
var block = builder.Build();
// Assert
Assert.Same(block, span.Parent);
}
public void Clone_ClonesSpan()
{
// Arrange
var spanBuilder = new SpanBuilder(new SourceLocation(1, 2, 3))
{
EditHandler = new SpanEditHandler(CSharpLanguageCharacteristics.Instance.TokenizeString),
Kind = SpanKindInternal.Transition,
ChunkGenerator = new ExpressionChunkGenerator(),
};
spanBuilder.Accept(new CSharpSymbol("@", CSharpSymbolType.Transition));
var span = spanBuilder.Build();
// Act
var copy = (Span)span.Clone();
// Assert
Assert.Equal(span, copy);
Assert.NotSame(span, copy);
}
protected override SyntaxTreeNode RewriteBlock(BlockBuilder parent, Block block)
{
// Collect the content of this node
var builder = new StringBuilder();
for (var i = 0; i < block.Children.Count; i++)
{
var childSpan = (Span)block.Children[i];
builder.Append(childSpan.Content);
}
// Create a new span containing this content
var span = new SpanBuilder(block.Children[0].Start);
span.EditHandler = SpanEditHandler.CreateDefault(HtmlLanguageCharacteristics.Instance.TokenizeString);
Debug.Assert(block.Children.Count > 0);
var start = ((Span)block.Children[0]).Start;
FillSpan(span, start, builder.ToString());
return(span.Build());
}
public void ReplaceWith(SpanBuilder builder)
{
Kind = builder.Kind;
Symbols = builder.Symbols;
for (var i = 0; i < Symbols.Count; i++)
{
Symbols[i].Parent = this;
}
EditHandler = builder.EditHandler;
ChunkGenerator = builder.ChunkGenerator ?? SpanChunkGenerator.Null;
_start = builder.Start;
_content = null;
_length = null;
Parent?.ChildChanged();
// Since we took references to the values in SpanBuilder, clear its references out
builder.Reset();
}
public void ChildChanged_NotifiesParent()
{
// Arrange
var spanBuilder = new SpanBuilder(SourceLocation.Zero);
spanBuilder.Accept(new HtmlSymbol("hello", HtmlSymbolType.Text));
var span = spanBuilder.Build();
var blockBuilder = new BlockBuilder()
{
Type = BlockKindInternal.Markup,
};
blockBuilder.Children.Add(span);
var childBlock = blockBuilder.Build();
blockBuilder = new BlockBuilder()
{
Type = BlockKindInternal.Markup,
};
blockBuilder.Children.Add(childBlock);
var parentBlock = blockBuilder.Build();
var originalBlockLength = parentBlock.Length;
spanBuilder = new SpanBuilder(SourceLocation.Zero);
spanBuilder.Accept(new HtmlSymbol("hi", HtmlSymbolType.Text));
span.ReplaceWith(spanBuilder);
// Wire up parents now so we can re-trigger ChildChanged to cause cache refresh.
span.Parent = childBlock;
childBlock.Parent = parentBlock;
// Act
childBlock.ChildChanged();
// Assert
Assert.Equal(5, originalBlockLength);
Assert.Equal(2, parentBlock.Length);
}
// This method handles cases when the attribute is a simple span attribute such as
// class="something moresomething". This does not handle complex attributes such as
// class="@myclass". Therefore the span.Content is equivalent to the entire attribute.
private static TryParseResult TryParseSpan(
Span span,
IEnumerable <TagHelperDescriptor> descriptors,
ErrorSink errorSink,
HashSet <string> processedBoundAttributeNames)
{
var afterEquals = false;
var builder = new SpanBuilder(span.Start)
{
ChunkGenerator = span.ChunkGenerator,
EditHandler = span.EditHandler,
Kind = span.Kind
};
// Will contain symbols that represent a single attribute value: <input| class="btn"| />
var htmlSymbols = span.Symbols.OfType <HtmlSymbol>().ToArray();
var capturedAttributeValueStart = false;
var attributeValueStartLocation = span.Start;
// Default to DoubleQuotes. We purposefully do not persist NoQuotes ValueStyle to stay consistent with the
// TryParseBlock() variation of attribute parsing.
var attributeValueStyle = AttributeStructure.DoubleQuotes;
// The symbolOffset is initialized to 0 to expect worst case: "class=". If a quote is found later on for
// the attribute value the symbolOffset is adjusted accordingly.
var symbolOffset = 0;
string name = null;
// Iterate down through the symbols to find the name and the start of the value.
// We subtract the symbolOffset so we don't accept an ending quote of a span.
for (var i = 0; i < htmlSymbols.Length - symbolOffset; i++)
{
var symbol = htmlSymbols[i];
if (afterEquals)
{
// We've captured all leading whitespace, the attribute name, and an equals with an optional
// quote/double quote. We're now at: " asp-for='|...'" or " asp-for=|..."
// The goal here is to capture all symbols until the end of the attribute. Note this will not
// consume an ending quote due to the symbolOffset.
// When symbols are accepted into SpanBuilders, their locations get altered to be offset by the
// parent which is why we need to mark our start location prior to adding the symbol.
// This is needed to know the location of the attribute value start within the document.
if (!capturedAttributeValueStart)
{
capturedAttributeValueStart = true;
attributeValueStartLocation = symbol.Start;
}
builder.Accept(symbol);
}
else if (name == null && HtmlMarkupParser.IsValidAttributeNameSymbol(symbol))
{
// We've captured all leading whitespace prior to the attribute name.
// We're now at: " |asp-for='...'" or " |asp-for=..."
// The goal here is to capture the attribute name.
var nameBuilder = new StringBuilder();
// Move the indexer past the attribute name symbols.
for (var j = i; j < htmlSymbols.Length; j++)
{
var nameSymbol = htmlSymbols[j];
if (!HtmlMarkupParser.IsValidAttributeNameSymbol(nameSymbol))
{
break;
}
nameBuilder.Append(nameSymbol.Content);
i++;
}
i--;
name = nameBuilder.ToString();
attributeValueStartLocation = SourceLocationTracker.Advance(attributeValueStartLocation, name);
}
else if (symbol.Type == HtmlSymbolType.Equals)
{
// We've captured all leading whitespace and the attribute name.
// We're now at: " asp-for|='...'" or " asp-for|=..."
// The goal here is to consume the equal sign and the optional single/double-quote.
// The coming symbols will either be a quote or value (in the case that the value is unquoted).
SourceLocation symbolStartLocation;
// Skip the whitespace preceding the start of the attribute value.
do
{
i++; // Start from the symbol after '='.
} while (i < htmlSymbols.Length &&
(htmlSymbols[i].Type == HtmlSymbolType.WhiteSpace ||
htmlSymbols[i].Type == HtmlSymbolType.NewLine));
// Check for attribute start values, aka single or double quote
if (i < htmlSymbols.Length && IsQuote(htmlSymbols[i]))
{
if (htmlSymbols[i].Type == HtmlSymbolType.SingleQuote)
{
attributeValueStyle = AttributeStructure.SingleQuotes;
}
symbolStartLocation = htmlSymbols[i].Start;
// If there's a start quote then there must be an end quote to be valid, skip it.
symbolOffset = 1;
}
else
{
// We are at the symbol after equals. Go back to equals to ensure we don't skip past that symbol.
i--;
symbolStartLocation = symbol.Start;
}
attributeValueStartLocation = new SourceLocation(
symbolStartLocation.FilePath,
symbolStartLocation.AbsoluteIndex + 1,
symbolStartLocation.LineIndex,
symbolStartLocation.CharacterIndex + 1);
afterEquals = true;
}
else if (symbol.Type == HtmlSymbolType.WhiteSpace)
{
// We're at the start of the attribute, this branch may be hit on the first iterations of
// the loop since the parser separates attributes with their spaces included as symbols.
// We're at: "| asp-for='...'" or "| asp-for=..."
// Note: This will not be hit even for situations like asp-for ="..." because the core Razor
// parser currently does not know how to handle attributes in that format. This will be addressed
// by https://github.com/aspnet/Razor/issues/123.
attributeValueStartLocation = SourceLocationTracker.Advance(attributeValueStartLocation, symbol.Content);
}
}
// After all symbols have been added we need to set the builders start position so we do not indirectly
// modify the span's start location.
builder.Start = attributeValueStartLocation;
if (name == null)
{
// We couldn't find a name, if the original span content was whitespace it ultimately means the tag
// that owns this "attribute" is malformed and is expecting a user to type a new attribute.
// ex: <myTH class="btn"| |
if (!string.IsNullOrWhiteSpace(span.Content))
{
errorSink.OnError(
span.Start,
LegacyResources.TagHelperBlockRewriter_TagHelperAttributeListMustBeWellFormed,
span.Content.Length);
}
return(null);
}
var result = CreateTryParseResult(name, descriptors, processedBoundAttributeNames);
// If we're not after an equal then we should treat the value as if it were a minimized attribute.
Span attributeValue = null;
if (afterEquals)
{
attributeValue = CreateMarkupAttribute(builder, result);
}
else
{
attributeValueStyle = AttributeStructure.Minimized;
}
result.AttributeValueNode = attributeValue;
result.AttributeStructure = attributeValueStyle;
return(result);
}
private void CommentSpanConfig(SpanBuilder span)
{
span.ChunkGenerator = SpanChunkGenerator.Null;
span.EditHandler = SpanEditHandler.CreateDefault(Language.TokenizeString);
}
public override SyntaxTreeNode Clone()
{
var spanBuilder = new SpanBuilder(this);
return(spanBuilder.Build());
}
public Span(SpanBuilder builder)
{
ReplaceWith(builder);
}
protected void Initialize(SpanBuilder span)
{
SpanConfig?.Invoke(span);
}