public void TestMultipleAttenuation()
{
RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
KeyPair root = new KeyPair(rng);
SymbolTable symbols = Biscuit.Token.Biscuit.DefaultSymbolTable();
BlockBuilder authority_builder = new BlockBuilder(0, symbols);
DateTime date = DateTime.Now;
authority_builder.AddFact(Utils.Fact("revocation_id", Arrays.AsList(Utils.Date(date))));
Biscuit.Token.Biscuit biscuit = Biscuit.Token.Biscuit.Make(rng, root, Biscuit.Token.Biscuit.DefaultSymbolTable(), authority_builder.Build()).Right;
BlockBuilder builder = biscuit.CreateBlock();
builder.AddFact(Utils.Fact(
"right",
Arrays.AsList(Utils.Symbol("topic"), Utils.Symbol("tenant"), Utils.Symbol("namespace"), Utils.Symbol("topic"), Utils.Symbol("produce"))
));
string attenuatedB64 = biscuit.Attenuate(rng, new KeyPair(rng), builder.Build()).Right.SerializeBase64().Right;
Console.WriteLine("attenuated: " + attenuatedB64);
var attenuatedB64Biscuit = Biscuit.Token.Biscuit.FromBase64(attenuatedB64);
Assert.IsTrue(attenuatedB64Biscuit.IsRight);
string attenuated2B64 = biscuit.Attenuate(rng, new KeyPair(rng), builder.Build()).Right.SerializeBase64().Right;
Console.WriteLine("attenuated2: " + attenuated2B64);
var attenuated2B64Biscuit = Biscuit.Token.Biscuit.FromBase64(attenuated2B64);
Assert.IsTrue(attenuated2B64Biscuit.IsRight);
}
protected internal virtual GeneratorResults GenerateCodeCore(
ITextDocument input,
string className,
string rootNamespace,
string sourceFileName,
string checksum,
CancellationToken?cancelToken)
{
if (input == null)
{
throw new ArgumentNullException(nameof(input));
}
try
{
className = (className ?? Host.DefaultClassName) ?? DefaultClassName;
rootNamespace = (rootNamespace ?? Host.DefaultNamespace) ?? DefaultNamespace;
// Run the parser
var parser = CreateParser(sourceFileName);
Debug.Assert(parser != null);
var results = parser.Parse(input);
// Generate code
var chunkGenerator = CreateChunkGenerator(className, rootNamespace, sourceFileName);
chunkGenerator.DesignTimeMode = Host.DesignTimeMode;
chunkGenerator.Visit(results);
var codeGeneratorContext = new CodeGeneratorContext(chunkGenerator.Context, results.ErrorSink);
codeGeneratorContext.Checksum = checksum;
var codeGenerator = CreateCodeGenerator(codeGeneratorContext);
var codeGeneratorResult = codeGenerator.Generate();
// Collect results and return
return(new GeneratorResults(results, codeGeneratorResult, codeGeneratorContext.ChunkTreeBuilder.Root));
}
// During runtime we want code generation explosions to flow up into the calling code. At design time
// we want to capture these exceptions to prevent IDEs from crashing.
catch (Exception ex) when(Host.DesignTimeMode)
{
var errorSink = new ErrorSink();
errorSink.OnError(
SourceLocation.Undefined,
RazorResources.FormatFatalException(sourceFileName, Environment.NewLine, ex.Message),
length: -1);
var emptyBlock = new BlockBuilder();
emptyBlock.Type = default(BlockType);
return(new GeneratorResults(
document: emptyBlock.Build(),
tagHelperDescriptors: Enumerable.Empty <TagHelperDescriptor>(),
errorSink: errorSink,
codeGeneratorResult: new CodeGeneratorResult(
code: string.Empty,
designTimeLineMappings: new List <LineMapping>()),
chunkTree: new ChunkTree()));
}
}
public RazorSyntaxTree Execute(RazorCodeDocument document, RazorSyntaxTree syntaxTree)
{
var trees = GetImportedSyntaxTrees(document);
if (trees.Count == 0)
{
return(syntaxTree);
}
var errors = new List <RazorError>(syntaxTree.Diagnostics);
var blockBuilder = new BlockBuilder(syntaxTree.Root);
for (var i = 0; i < trees.Count; i++)
{
var tree = trees[i];
blockBuilder.Children.Insert(i, tree.Root);
errors.AddRange(tree.Diagnostics);
foreach (var error in tree.Diagnostics)
{
document.ErrorSink.OnError(error);
}
}
return(RazorSyntaxTree.Create(blockBuilder.Build(), errors));
}
public override void VisitBlock(Block block)
{
if (CanRewrite(block))
{
SyntaxTreeNode newNode = RewriteBlock(_blocks.Peek(), block);
block = newNode as Block;
if (block == null)
{
_blocks.Peek().Children.Add(newNode);
return;
}
}
BlockBuilder builder = new BlockBuilder(block);
builder.Children.Clear();
_blocks.Push(builder);
base.VisitBlock(block);
Debug.Assert(ReferenceEquals(builder, _blocks.Peek()));
if (_blocks.Count > 1)
{
_blocks.Pop();
_blocks.Peek().Children.Add(builder.Build());
}
}
public void AddSpanAddsSpanToCurrentBlockBuilder()
{
// Arrange
var factory = SpanFactory.CreateCsHtml();
Mock <ParserVisitor> mockListener = new Mock <ParserVisitor>();
var context = SetupTestContext("phoo");
var builder = new SpanBuilder()
{
Kind = SpanKind.Code
};
builder.Accept(new CSharpSymbol(1, 0, 1, "foo", CSharpSymbolType.Identifier));
var added = builder.Build();
using (context.StartBlock(BlockType.Functions))
{
context.AddSpan(added);
}
var expected = new BlockBuilder()
{
Type = BlockType.Functions,
};
expected.Children.Add(added);
// Assert
ParserTestBase.EvaluateResults(context.CompleteParse(), expected.Build());
}
public void TestGetRevocationIds()
{
RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
KeyPair root = new KeyPair(rng);
SymbolTable symbols = Biscuit.Token.Biscuit.DefaultSymbolTable();
BlockBuilder authority_builder = new BlockBuilder(0, symbols);
Guid uuid1 = Guid.Parse("0b6d033d-83da-437f-a078-1a44890018bc");
authority_builder.AddFact(Utils.Fact("revocation_id", Arrays.AsList(Utils.Strings(uuid1.ToString()))));
Biscuit.Token.Biscuit biscuit = Biscuit.Token.Biscuit.Make(rng, root, Biscuit.Token.Biscuit.DefaultSymbolTable(), authority_builder.Build()).Right;
BlockBuilder builder = biscuit.CreateBlock();
builder.AddFact(Utils.Fact(
"right",
Arrays.AsList(Utils.Symbol("topic"), Utils.Symbol("tenant"), Utils.Symbol("namespace"), Utils.Symbol("topic"), Utils.Symbol("produce"))
));
Guid uuid2 = Guid.Parse("46a103de-ee65-4d04-936b-9111eac7dd3b");
builder.AddFact(Utils.Fact("revocation_id", Arrays.AsList(Utils.Strings(uuid2.ToString()))));
string attenuatedB64 = biscuit.Attenuate(rng, new KeyPair(rng), builder.Build()).Right.SerializeBase64().Right;
Biscuit.Token.Biscuit b = Biscuit.Token.Biscuit.FromBase64(attenuatedB64).Right;
Verifier v1 = b.Verify(root.ToPublicKey()).Right;
List <Guid> revokedIds = v1.GetRevocationIdentifiers().Right.Select(s => Guid.Parse(s)).ToList();
Assert.IsTrue(revokedIds.Contains(uuid1));
Assert.IsTrue(revokedIds.Contains(uuid2));
}
public override void VisitBlock(Block block)
{
if (CanRewrite(block))
{
var newNode = RewriteBlock(_blocks.Peek(), block);
if (newNode != null)
{
_blocks.Peek().Children.Add(newNode);
}
}
else
{
// Not rewritable.
var builder = new BlockBuilder(block);
builder.Children.Clear();
_blocks.Push(builder);
base.VisitBlock(block);
Debug.Assert(ReferenceEquals(builder, _blocks.Peek()));
if (_blocks.Count > 1)
{
_blocks.Pop();
_blocks.Peek().Children.Add(builder.Build());
}
}
}
private static Block ConvertToMarkupAttributeBlock(
Block block,
Func <Block, Span, Span> createMarkupAttribute)
{
var blockBuilder = new BlockBuilder
{
ChunkGenerator = block.ChunkGenerator,
Type = block.Type
};
foreach (var child in block.Children)
{
SyntaxTreeNode markupAttributeChild;
if (child.IsBlock)
{
markupAttributeChild = ConvertToMarkupAttributeBlock((Block)child, createMarkupAttribute);
}
else
{
markupAttributeChild = createMarkupAttribute(block, (Span)child);
}
blockBuilder.Children.Add(markupAttributeChild);
}
return(blockBuilder.Build());
}
private static Block ConvertToMarkupAttributeBlock(Block block, bool isBoundNonStringAttribute)
{
var blockBuilder = new BlockBuilder
{
ChunkGenerator = block.ChunkGenerator,
Type = block.Type
};
foreach (var child in block.Children)
{
SyntaxTreeNode markupAttributeChild;
if (child.IsBlock)
{
markupAttributeChild = ConvertToMarkupAttributeBlock((Block)child, isBoundNonStringAttribute);
}
else
{
var spanBuilder = new SpanBuilder((Span)child);
markupAttributeChild = CreateMarkupAttribute(spanBuilder, isBoundNonStringAttribute);
}
blockBuilder.Children.Add(markupAttributeChild);
}
return(blockBuilder.Build());
}
//public override void VisitBlock(Block block)
//{
// BlockBuilder parent = null;
// if (_blocks.Count > 0)
// {
// parent = _blocks.Peek();
// }
// BlockBuilder newBlock = new BlockBuilder(block);
// newBlock.Children.Clear();
// _blocks.Push(newBlock);
// if (block.Type == BlockType.Expression && parent != null)
// {
// VisitExpressionBlock(block, parent);
// }
// else
// {
// base.VisitBlock(block);
// }
// if (_blocks.Count > 1)
// {
// parent.Children.Add(_blocks.Pop().Build());
// }
//}
//public override void VisitSpan(Span span)
//{
// Debug.Assert(_blocks.Count > 0);
// _blocks.Peek().Children.Add(span);
//}
protected override SyntaxTreeNode RewriteBlock(BlockBuilder parent, Block block)
{
BlockBuilder newBlock = new BlockBuilder(block);
newBlock.Children.Clear();
Span ws = block.Children.FirstOrDefault() as Span;
IEnumerable <SyntaxTreeNode> newNodes = block.Children;
if (ws.Content.All(Char.IsWhiteSpace))
{
// Add this node to the parent
SpanBuilder builder = new SpanBuilder(ws);
builder.ClearSymbols();
FillSpan(builder, ws.Start, ws.Content);
parent.Children.Add(builder.Build());
// Remove the old whitespace node
newNodes = block.Children.Skip(1);
}
foreach (SyntaxTreeNode node in newNodes)
{
newBlock.Children.Add(node);
}
return(newBlock.Build());
}
public void Rewrite(RewritingContext context)
{
RewriteTags(context.SyntaxTree);
ValidateRewrittenSyntaxTree(context);
context.SyntaxTree = _currentBlock.Build();
}
public static Block BuildEmptyBlock()
{
var builder = new BlockBuilder();
builder.Name = "Test";
builder.Type = BlockType.Comment;
return(builder.Build());
}
private static KeyValuePair <string, SyntaxTreeNode> ParseBlock(Block block)
{
// TODO: Accept more than just spans: https://github.com/aspnet/Razor/issues/96.
// The first child will only ever NOT be a Span if a user is doing something like:
// <input @checked />
var childSpan = block.Children.First() as Span;
if (childSpan == null)
{
throw new InvalidOperationException(RazorResources.TagHelpers_CannotHaveCSharpInTagDeclaration);
}
var builder = new BlockBuilder(block);
// If there's only 1 child it means that it's plain text inside of the attribute.
// i.e. <div class="plain text in attribute">
if (builder.Children.Count == 1)
{
return(ParseSpan(childSpan));
}
var textSymbol = childSpan.Symbols.FirstHtmlSymbolAs(HtmlSymbolType.Text);
var name = textSymbol != null ? textSymbol.Content : null;
if (name == null)
{
throw new InvalidOperationException(RazorResources.TagHelpers_AttributesMustHaveAName);
}
// Remove first child i.e. foo="
builder.Children.RemoveAt(0);
// Grabbing last child to check if the attribute value is quoted.
var endNode = block.Children.Last();
if (!endNode.IsBlock)
{
var endSpan = (Span)endNode;
var endSymbol = (HtmlSymbol)endSpan.Symbols.Last();
// Checking to see if it's a quoted attribute, if so we should remove end quote
if (IsQuote(endSymbol))
{
builder.Children.RemoveAt(builder.Children.Count - 1);
}
}
// We need to rebuild the code generators of the builder and its children (this is needed to
// ensure we don't do special attribute code generation since this is a tag helper).
block = RebuildCodeGenerators(builder.Build());
return(new KeyValuePair <string, SyntaxTreeNode>(name, block));
}
public void ConstructorWithBlockBuilderSetsParent()
{
// Arrange
var builder = new BlockBuilder() { Type = BlockType.Comment };
var span = new SpanBuilder() { Kind = SpanKind.Code }.Build();
builder.Children.Add(span);
// Act
var block = builder.Build();
// Assert
Assert.Same(block, span.Parent);
}
public static Block BuildWithChildren(params SyntaxTreeNode[] children)
{
var builder = new BlockBuilder();
builder.Name = "Test";
builder.Type = BlockType.Comment;
foreach (var item in children)
{
builder.Children.Add(item);
}
return(builder.Build());
}
public void ConstructorCopiesBasicValuesFromBlockBuilder()
{
// Arrange
BlockBuilder builder = new BlockBuilder()
{
Name = "Foo", Type = BlockType.Helper
};
// Act
Block actual = builder.Build();
// Assert
Assert.Equal("Foo", actual.Name);
Assert.Equal(BlockType.Helper, actual.Type);
}
protected override SyntaxTreeNode RewriteBlock(BlockBuilder parent, Block block)
{
var b = new BlockBuilder(block);
var abGen = block.CodeGenerator as AttributeBlockCodeGenerator;
if (abGen != null)
{
b.CodeGenerator = new PreprocessedAttributeBlockCodeGenerator(abGen);
}
else
{
b.CodeGenerator = new PreprocessedDynamicAttributeBlockCodeGenerator((DynamicAttributeBlockCodeGenerator)b.CodeGenerator);
}
return(b.Build());
}
public void TestEmptyVerifier()
{
byte[] seed = { 0, 0, 0, 0 };
RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider(seed);
Console.WriteLine("preparing the authority block");
KeyPair root = new KeyPair(rng);
Biscuit.Token.Builder.BiscuitBuilder builder = Biscuit.Token.Biscuit.Builder(rng, root);
builder.AddRight("/folder1/file1", "read");
builder.AddRight("/folder1/file1", "write");
builder.AddRight("/folder1/file2", "read");
builder.AddRight("/folder1/file2", "write");
builder.AddRight("/folder2/file3", "read");
Console.WriteLine(builder.Build());
Biscuit.Token.Biscuit b = builder.Build().Right;
Console.WriteLine(b.Print());
BlockBuilder block2 = b.CreateBlock();
block2.ResourcePrefix("/folder1/");
block2.CheckRight("read");
KeyPair keypair2 = new KeyPair(rng);
Biscuit.Token.Biscuit b2 = b.Attenuate(rng, keypair2, block2.Build()).Right;
Verifier v1 = new Verifier();
v1.Allow();
Either <Error, long> res = v1.Verify();
Assert.IsTrue(res.IsRight);
v1.AddToken(b2, Option.Some(root.ToPublicKey())).Get();
v1.AddResource("/folder2/file1");
v1.AddOperation("write");
res = v1.Verify();
Assert.IsTrue(res.IsLeft);
}
public Block Block(BlockType type, string name = null, params SyntaxTreeNode[] children)
{
_last = null;
var builder = new BlockBuilder();
builder.Type = type;
builder.Name = name;
foreach (var child in children)
{
builder.Children.Add(child);
}
return(builder.Build());
}
public void ConstructorTransfersInstanceOfChunkGeneratorFromBlockBuilder()
{
// Arrange
var expected = new ExpressionChunkGenerator();
var builder = new BlockBuilder()
{
Type = BlockType.Helper,
ChunkGenerator = expected
};
// Act
var actual = builder.Build();
// Assert
Assert.Same(expected, actual.ChunkGenerator);
}
public void ConstructorTransfersChildrenFromBlockBuilder()
{
// Arrange
var expected = new SpanBuilder() { Kind = SpanKind.Code }.Build();
var builder = new BlockBuilder()
{
Type = BlockType.Functions
};
builder.Children.Add(expected);
// Act
var block = builder.Build();
// Assert
Assert.Same(expected, block.Children.Single());
}
public RazorSyntaxTree Execute(RazorCodeDocument document, RazorSyntaxTree syntaxTree)
{
Block expression;
Span route;
if (!TryFindPageDirectiveBlocks(syntaxTree.Root, out expression, out route))
{
return(syntaxTree);
}
var builder = new BlockBuilder(syntaxTree.Root);
builder.Children.Remove(expression);
builder.Children.Remove(route);
return(RazorSyntaxTree.Create(builder.Build(), syntaxTree.Diagnostics));
}
protected virtual Block ConfigureAndAddSpanToBlock(BlockBuilder block, SpanConstructor span)
{
switch (block.Type)
{
case BlockType.Markup:
span.With(new MarkupChunkGenerator());
break;
case BlockType.Statement:
span.With(new StatementChunkGenerator());
break;
case BlockType.Expression:
block.ChunkGenerator = new ExpressionChunkGenerator();
span.With(new ExpressionChunkGenerator());
break;
}
block.Children.Add(span);
return(block.Build());
}
/// <summary>
/// Ends the current block
/// </summary>
public void EndBlock()
{
EnusreNotTerminated();
AssertOnOwnerTask();
if (_blockStack.Count == 0)
{
throw new InvalidOperationException(RazorResources.EndBlock_Called_Without_Matching_StartBlock);
}
if (_blockStack.Count > 1)
{
BlockBuilder block = _blockStack.Pop();
_blockStack.Peek().Children.Add(block.Build());
}
else
{
// If we're at 1, terminate the parser
_terminated = true;
}
}
public void Compile()
{
Progress(BuildStep.Compiling);
Backend.Begin(this);
foreach (var upk in Input.Packages)
{
if (Backend.CanLink(upk))
{
upk.Flags |= SourcePackageFlags.CanLink;
}
}
using (Log.StartProfiler(TypeBuilder))
TypeBuilder.Build();
if (Log.HasErrors)
{
return;
}
Backend.ShaderBackend.Initialize(this, BundleBuilder);
using (Log.StartProfiler(BlockBuilder))
BlockBuilder.Build();
if (Log.HasErrors)
{
return;
}
using (Log.StartProfiler(UxlProcessor))
UxlProcessor.CompileDocuments();
if (Log.HasErrors)
{
return;
}
Run(new ILAnalyzer(Pass));
Run(ILVerifier);
}
private void UnterminatedBlockCore(
string keyword,
string expectedTerminator,
BlockType blockType,
bool keywordIsMetaCode,
Func <UnclassifiedCodeSpanConstructor, SpanConstructor> classifier
)
{
const string blockBody =
@"
' This block is not correctly terminated!";
BlockBuilder expected = new BlockBuilder();
expected.Type = blockType;
if (keywordIsMetaCode)
{
expected.Children.Add(Factory.MetaCode(keyword).Accepts(AcceptedCharacters.None));
expected.Children.Add(classifier(Factory.Code(blockBody)));
}
else
{
expected.Children.Add(classifier(Factory.Code(keyword + blockBody)));
}
ParseBlockTest(
keyword + blockBody,
expected.Build(),
new RazorError(
String.Format(
RazorResources.ParseError_BlockNotTerminated,
keyword,
expectedTerminator
),
SourceLocation.Zero
)
);
}
private void EofBlockCore(string keyword, string expectedTerminator, bool autoComplete, BlockType blockType, bool keywordIsMetaCode, Func <UnclassifiedCodeSpanConstructor, SpanConstructor> classifier)
{
BlockBuilder expected = new BlockBuilder();
expected.Type = blockType;
if (keywordIsMetaCode)
{
expected.Children.Add(Factory.MetaCode(keyword).Accepts(AcceptedCharacters.None));
expected.Children.Add(
classifier(Factory.EmptyVB())
.With((SpanEditHandler)(
autoComplete ?
new AutoCompleteEditHandler(CSharpLanguageCharacteristics.Instance.TokenizeString)
{
AutoCompleteString = expectedTerminator
} :
SpanEditHandler.CreateDefault())));
}
else
{
expected.Children.Add(
classifier(Factory.Code(keyword))
.With((SpanEditHandler)(
autoComplete ?
new AutoCompleteEditHandler(CSharpLanguageCharacteristics.Instance.TokenizeString)
{
AutoCompleteString = expectedTerminator
} :
SpanEditHandler.CreateDefault())));
}
ParseBlockTest(keyword,
expected.Build(),
new RazorError(
String.Format(RazorResources.ParseError_BlockNotTerminated, keyword, expectedTerminator),
SourceLocation.Zero));
}
private static Block RebuildChunkGenerators(Block block, bool isBound)
{
var builder = new BlockBuilder(block);
// Don't want to rebuild unbound dynamic attributes. They need to run through the conditional attribute
// removal system at runtime. A conditional attribute at the parse tree rewriting level is defined by
// having at least 1 child with a DynamicAttributeBlockChunkGenerator.
if (!isBound &&
block.Children.Any(
child => child.IsBlock &&
((Block)child).ChunkGenerator is DynamicAttributeBlockChunkGenerator))
{
// The parent chunk generator must be removed because it's normally responsible for conditionally
// generating the attribute prefix (class=") and suffix ("). The prefix and suffix concepts aren't
// applicable for the TagHelper use case since the attributes are put into a dictionary like object as
// name value pairs.
builder.ChunkGenerator = ParentChunkGenerator.Null;
return(builder.Build());
}
var isDynamic = builder.ChunkGenerator is DynamicAttributeBlockChunkGenerator;
// We don't want any attribute specific logic here, null out the block chunk generator.
if (isDynamic || builder.ChunkGenerator is AttributeBlockChunkGenerator)
{
builder.ChunkGenerator = ParentChunkGenerator.Null;
}
for (var i = 0; i < builder.Children.Count; i++)
{
var child = builder.Children[i];
if (child.IsBlock)
{
// The child is a block, recurse down into the block to rebuild its children
builder.Children[i] = RebuildChunkGenerators((Block)child, isBound);
}
else
{
var childSpan = (Span)child;
ISpanChunkGenerator newChunkGenerator = null;
var literalGenerator = childSpan.ChunkGenerator as LiteralAttributeChunkGenerator;
if (literalGenerator != null)
{
if (literalGenerator.ValueGenerator == null || literalGenerator.ValueGenerator.Value == null)
{
newChunkGenerator = new MarkupChunkGenerator();
}
else
{
newChunkGenerator = literalGenerator.ValueGenerator.Value;
}
}
else if (isDynamic && childSpan.ChunkGenerator == SpanChunkGenerator.Null)
{
// Usually the dynamic chunk generator handles creating the null chunk generators underneath
// it. This doesn't make sense in terms of tag helpers though, we need to change null code
// generators to markup chunk generators.
newChunkGenerator = new MarkupChunkGenerator();
}
// If we have a new chunk generator we'll need to re-build the child
if (newChunkGenerator != null)
{
var childSpanBuilder = new SpanBuilder(childSpan)
{
ChunkGenerator = newChunkGenerator
};
builder.Children[i] = childSpanBuilder.Build();
}
}
}
return(builder.Build());
}
private static TryParseResult TryParseBlock(
string tagName,
Block block,
IEnumerable <TagHelperDescriptor> descriptors,
ErrorSink errorSink)
{
// TODO: Accept more than just spans: https://github.com/aspnet/Razor/issues/96.
// The first child will only ever NOT be a Span if a user is doing something like:
// <input @checked />
var childSpan = block.Children.First() as Span;
if (childSpan == null || childSpan.Kind != SpanKind.Markup)
{
errorSink.OnError(
block.Start,
RazorResources.FormatTagHelpers_CannotHaveCSharpInTagDeclaration(tagName),
block.Length);
return(null);
}
var builder = new BlockBuilder(block);
// If there's only 1 child it means that it's plain text inside of the attribute.
// i.e. <div class="plain text in attribute">
if (builder.Children.Count == 1)
{
return(TryParseSpan(childSpan, descriptors, errorSink));
}
var nameSymbols = childSpan
.Symbols
.OfType <HtmlSymbol>()
.SkipWhile(symbol => !HtmlMarkupParser.IsValidAttributeNameSymbol(symbol)) // Skip prefix
.TakeWhile(nameSymbol => HtmlMarkupParser.IsValidAttributeNameSymbol(nameSymbol))
.Select(nameSymbol => nameSymbol.Content);
var name = string.Concat(nameSymbols);
if (string.IsNullOrEmpty(name))
{
errorSink.OnError(
childSpan.Start,
RazorResources.FormatTagHelpers_AttributesMustHaveAName(tagName),
childSpan.Length);
return(null);
}
// Have a name now. Able to determine correct isBoundNonStringAttribute value.
var result = CreateTryParseResult(name, descriptors);
var firstChild = builder.Children[0] as Span;
if (firstChild != null && firstChild.Symbols[0] is HtmlSymbol)
{
var htmlSymbol = firstChild.Symbols[firstChild.Symbols.Count - 1] as HtmlSymbol;
switch (htmlSymbol.Type)
{
// Treat NoQuotes and DoubleQuotes equivalently. We purposefully do not persist NoQuotes
// ValueStyles at code generation time to protect users from rendering dynamic content with spaces
// that can break attributes.
// Ex: <tag my-attribute=@value /> where @value results in the test "hello world".
// This way, the above code would render <tag my-attribute="hello world" />.
case HtmlSymbolType.Equals:
case HtmlSymbolType.DoubleQuote:
result.AttributeValueStyle = HtmlAttributeValueStyle.DoubleQuotes;
break;
case HtmlSymbolType.SingleQuote:
result.AttributeValueStyle = HtmlAttributeValueStyle.SingleQuotes;
break;
default:
result.AttributeValueStyle = HtmlAttributeValueStyle.Minimized;
break;
}
}
// Remove first child i.e. foo="
builder.Children.RemoveAt(0);
// Grabbing last child to check if the attribute value is quoted.
var endNode = block.Children.Last();
if (!endNode.IsBlock)
{
var endSpan = (Span)endNode;
// In some malformed cases e.g. <p bar="false', the last Span (false' in the ex.) may contain more
// than a single HTML symbol. Do not ignore those other symbols.
var symbolCount = endSpan.Symbols.Count();
var endSymbol = symbolCount == 1 ? (HtmlSymbol)endSpan.Symbols.First() : null;
// Checking to see if it's a quoted attribute, if so we should remove end quote
if (endSymbol != null && IsQuote(endSymbol))
{
builder.Children.RemoveAt(builder.Children.Count - 1);
}
}
// We need to rebuild the chunk generators of the builder and its children (this is needed to
// ensure we don't do special attribute chunk generation since this is a tag helper).
block = RebuildChunkGenerators(builder.Build(), result.IsBoundAttribute);
// If there's only 1 child at this point its value could be a simple markup span (treated differently than
// block level elements for attributes).
if (block.Children.Count() == 1)
{
var child = block.Children.First() as Span;
if (child != null)
{
// After pulling apart the block we just have a value span.
var spanBuilder = new SpanBuilder(child);
result.AttributeValueNode =
CreateMarkupAttribute(spanBuilder, result.IsBoundNonStringAttribute);
return(result);
}
}
var isFirstSpan = true;
result.AttributeValueNode = ConvertToMarkupAttributeBlock(
block,
(parentBlock, span) =>
{
// If the attribute was requested by a tag helper but the corresponding property was not a
// string, then treat its value as code. A non-string value can be any C# value so we need
// to ensure the SyntaxTreeNode reflects that.
if (result.IsBoundNonStringAttribute)
{
// For bound non-string attributes, we'll only allow a transition span to appear at the very
// beginning of the attribute expression. All later transitions would appear as code so that
// they are part of the generated output. E.g.
// key="@value" -> MyTagHelper.key = value
// key=" @value" -> MyTagHelper.key = @value
// key="1 + @case" -> MyTagHelper.key = 1 + @case
// key="@int + @case" -> MyTagHelper.key = int + @case
// key="@(a + b) -> MyTagHelper.key = a + b
// key="4 + @(a + b)" -> MyTagHelper.key = 4 + @(a + b)
if (isFirstSpan && span.Kind == SpanKind.Transition)
{
// do nothing.
}
else
{
var spanBuilder = new SpanBuilder(span);
if (parentBlock.Type == BlockType.Expression &&
(spanBuilder.Kind == SpanKind.Transition ||
spanBuilder.Kind == SpanKind.MetaCode))
{
// Change to a MarkupChunkGenerator so that the '@' \ parenthesis is generated as part of the output.
spanBuilder.ChunkGenerator = new MarkupChunkGenerator();
}
spanBuilder.Kind = SpanKind.Code;
span = spanBuilder.Build();
}
}
isFirstSpan = false;
return(span);
});
return(result);
}
public void Rewrite(RewritingContext context)
{
RewriteTags(context.SyntaxTree, context);
context.SyntaxTree = _currentBlock.Build();
}