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HtmlMarkupParser.cs
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HtmlMarkupParser.cs
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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using Microsoft.AspNetCore.Razor.Language.Syntax.InternalSyntax;
namespace Microsoft.AspNetCore.Razor.Language.Legacy
{
internal class HtmlMarkupParser : TokenizerBackedParser<HtmlTokenizer>
{
private const string ScriptTagName = "script";
private static readonly SyntaxToken[] nonAllowedHtmlCommentEnding = new[]
{
SyntaxFactory.Token(SyntaxKind.Text, "-"),
SyntaxFactory.Token(SyntaxKind.Bang, "!"),
SyntaxFactory.Token(SyntaxKind.OpenAngle, "<"),
};
private static readonly SyntaxToken[] singleHyphenArray = new[]
{
SyntaxFactory.Token(SyntaxKind.Text, "-")
};
private static readonly char[] ValidAfterTypeAttributeNameCharacters = { ' ', '\t', '\r', '\n', '\f', '=' };
private SourceLocation _lastTagStart = SourceLocation.Zero;
private SyntaxToken _bufferedOpenAngle;
//From http://dev.w3.org/html5/spec/Overview.html#elements-0
private readonly ISet<string> _voidElements = new HashSet<string>(StringComparer.OrdinalIgnoreCase)
{
"area",
"base",
"br",
"col",
"command",
"embed",
"hr",
"img",
"input",
"keygen",
"link",
"meta",
"param",
"source",
"track",
"wbr"
};
public HtmlMarkupParser(ParserContext context)
: base(context.ParseLeadingDirectives ? FirstDirectiveHtmlLanguageCharacteristics.Instance : HtmlLanguageCharacteristics.Instance, context)
{
}
public ParserBase CodeParser { get; set; }
public ISet<string> VoidElements
{
get { return _voidElements; }
}
private bool CaseSensitive { get; set; }
private StringComparison Comparison
{
get { return CaseSensitive ? StringComparison.Ordinal : StringComparison.OrdinalIgnoreCase; }
}
protected override bool TokenKindEquals(SyntaxKind x, SyntaxKind y) => x == y;
public override void BuildSpan(SpanBuilder span, SourceLocation start, string content)
{
span.Kind = SpanKindInternal.Markup;
span.ChunkGenerator = new MarkupChunkGenerator();
base.BuildSpan(span, start, content);
}
protected override void OutputSpanBeforeRazorComment()
{
Output(SpanKindInternal.Markup);
}
protected void SkipToAndParseCode(SyntaxKind type)
{
SkipToAndParseCode(token => token.Kind == type);
}
protected void SkipToAndParseCode(Func<SyntaxToken, bool> condition)
{
SyntaxToken last = null;
var startOfLine = false;
while (!EndOfFile && !condition(CurrentToken))
{
if (Context.NullGenerateWhitespaceAndNewLine)
{
Context.NullGenerateWhitespaceAndNewLine = false;
Span.ChunkGenerator = SpanChunkGenerator.Null;
AcceptWhile(token => token.Kind == SyntaxKind.Whitespace);
if (At(SyntaxKind.NewLine))
{
AcceptAndMoveNext();
}
Output(SpanKindInternal.Markup);
}
else if (At(SyntaxKind.NewLine))
{
if (last != null)
{
Accept(last);
}
// Mark the start of a new line
startOfLine = true;
last = null;
AcceptAndMoveNext();
}
else if (At(SyntaxKind.Transition))
{
var transition = CurrentToken;
NextToken();
if (At(SyntaxKind.Transition))
{
if (last != null)
{
Accept(last);
last = null;
}
Output(SpanKindInternal.Markup);
Accept(transition);
Span.ChunkGenerator = SpanChunkGenerator.Null;
Output(SpanKindInternal.Markup);
AcceptAndMoveNext();
continue; // while
}
else
{
if (!EndOfFile)
{
PutCurrentBack();
}
PutBack(transition);
}
// Handle whitespace rewriting
if (last != null)
{
if (!Context.DesignTimeMode && last.Kind == SyntaxKind.Whitespace && startOfLine)
{
// Put the whitespace back too
startOfLine = false;
PutBack(last);
last = null;
}
else
{
// Accept last
Accept(last);
last = null;
}
}
OtherParserBlock();
}
else if (At(SyntaxKind.RazorCommentTransition))
{
if (last != null)
{
// Don't render the whitespace between the start of the line and the razor comment.
if (startOfLine && last.Kind == SyntaxKind.Whitespace)
{
AddMarkerTokenIfNecessary();
// Output the tokens that may have been accepted prior to the whitespace.
Output(SpanKindInternal.Markup);
Span.ChunkGenerator = SpanChunkGenerator.Null;
}
Accept(last);
last = null;
}
AddMarkerTokenIfNecessary();
Output(SpanKindInternal.Markup);
RazorComment();
// Handle the whitespace and newline at the end of a razor comment.
if (startOfLine &&
(At(SyntaxKind.NewLine) ||
(At(SyntaxKind.Whitespace) && NextIs(SyntaxKind.NewLine))))
{
AcceptWhile(IsSpacingToken(includeNewLines: false));
AcceptAndMoveNext();
Span.ChunkGenerator = SpanChunkGenerator.Null;
Output(SpanKindInternal.Markup);
}
}
else
{
// As long as we see whitespace, we're still at the "start" of the line
startOfLine &= At(SyntaxKind.Whitespace);
// If there's a last token, accept it
if (last != null)
{
Accept(last);
last = null;
}
// Advance
last = CurrentToken;
NextToken();
}
}
if (last != null)
{
Accept(last);
}
}
protected static Func<SyntaxToken, bool> IsSpacingToken(bool includeNewLines)
{
return token => token.Kind == SyntaxKind.Whitespace || (includeNewLines && token.Kind == SyntaxKind.NewLine);
}
private void OtherParserBlock()
{
AddMarkerTokenIfNecessary();
Output(SpanKindInternal.Markup);
using (PushSpanConfig())
{
CodeParser.ParseBlock();
}
Span.Start = CurrentLocation;
Initialize(Span);
NextToken();
}
private bool IsBangEscape(int lookahead)
{
var potentialBang = Lookahead(lookahead);
if (potentialBang != null &&
potentialBang.Kind == SyntaxKind.Bang)
{
var afterBang = Lookahead(lookahead + 1);
return afterBang != null &&
afterBang.Kind == SyntaxKind.Text &&
!string.Equals(afterBang.Content, "DOCTYPE", StringComparison.OrdinalIgnoreCase);
}
return false;
}
private void OptionalBangEscape()
{
if (IsBangEscape(lookahead: 0))
{
Output(SpanKindInternal.Markup);
// Accept the parser escape character '!'.
Assert(SyntaxKind.Bang);
AcceptAndMoveNext();
// Setup the metacode span that we will be outputing.
Span.ChunkGenerator = SpanChunkGenerator.Null;
Output(SpanKindInternal.MetaCode, AcceptedCharactersInternal.None);
}
}
public override void ParseBlock()
{
if (Context == null)
{
throw new InvalidOperationException(Resources.Parser_Context_Not_Set);
}
using (PushSpanConfig(DefaultMarkupSpan))
{
using (Context.Builder.StartBlock(BlockKindInternal.Markup))
{
Span.Start = CurrentLocation;
if (!NextToken())
{
return;
}
AcceptWhile(IsSpacingToken(includeNewLines: true));
if (CurrentToken.Kind == SyntaxKind.OpenAngle)
{
// "<" => Implicit Tag Block
TagBlock(new Stack<Tuple<SyntaxToken, SourceLocation>>());
}
else if (CurrentToken.Kind == SyntaxKind.Transition)
{
// "@" => Explicit Tag/Single Line Block OR Template
Output(SpanKindInternal.Markup);
// Definitely have a transition span
Assert(SyntaxKind.Transition);
AcceptAndMoveNext();
Span.EditHandler.AcceptedCharacters = AcceptedCharactersInternal.None;
Span.ChunkGenerator = SpanChunkGenerator.Null;
Output(SpanKindInternal.Transition);
if (At(SyntaxKind.Transition))
{
Span.ChunkGenerator = SpanChunkGenerator.Null;
AcceptAndMoveNext();
Output(SpanKindInternal.MetaCode);
}
AfterTransition();
}
else
{
Context.ErrorSink.OnError(
RazorDiagnosticFactory.CreateParsing_MarkupBlockMustStartWithTag(
new SourceSpan(CurrentStart, CurrentToken.Content.Length)));
}
Output(SpanKindInternal.Markup);
}
}
}
private void DefaultMarkupSpan(SpanBuilder span)
{
span.ChunkGenerator = new MarkupChunkGenerator();
span.EditHandler = new SpanEditHandler(Language.TokenizeString, AcceptedCharactersInternal.Any);
}
private void AfterTransition()
{
// "@:" => Explicit Single Line Block
if (CurrentToken.Kind == SyntaxKind.Text && CurrentToken.Content.Length > 0 && CurrentToken.Content[0] == ':')
{
// Split the token
var split = Language.SplitToken(CurrentToken, 1, SyntaxKind.Colon);
// The first part (left) is added to this span and we return a MetaCode span
Accept(split.Item1);
Span.ChunkGenerator = SpanChunkGenerator.Null;
Output(SpanKindInternal.MetaCode);
if (split.Item2 != null)
{
Accept(split.Item2);
}
NextToken();
SingleLineMarkup();
}
else if (CurrentToken.Kind == SyntaxKind.OpenAngle)
{
TagBlock(new Stack<Tuple<SyntaxToken, SourceLocation>>());
}
}
private void SingleLineMarkup()
{
// Parse until a newline, it's that simple!
// First, signal to code parser that whitespace is significant to us.
var old = Context.WhiteSpaceIsSignificantToAncestorBlock;
Context.WhiteSpaceIsSignificantToAncestorBlock = true;
Span.EditHandler = new SpanEditHandler(Language.TokenizeString);
SkipToAndParseCode(SyntaxKind.NewLine);
if (!EndOfFile && CurrentToken.Kind == SyntaxKind.NewLine)
{
AcceptAndMoveNext();
Span.EditHandler.AcceptedCharacters = AcceptedCharactersInternal.None;
}
PutCurrentBack();
Context.WhiteSpaceIsSignificantToAncestorBlock = old;
Output(SpanKindInternal.Markup);
}
private void TagBlock(Stack<Tuple<SyntaxToken, SourceLocation>> tags)
{
// Skip Whitespace and Text
var complete = false;
do
{
SkipToAndParseCode(SyntaxKind.OpenAngle);
// Output everything prior to the OpenAngle into a markup span
Output(SpanKindInternal.Markup);
// Do not want to start a new tag block if we're at the end of the file.
IDisposable tagBlockWrapper = null;
try
{
var atSpecialTag = AtSpecialTag;
if (!EndOfFile && !atSpecialTag)
{
// Start a Block tag. This is used to wrap things like <p> or <a class="btn"> etc.
tagBlockWrapper = Context.Builder.StartBlock(BlockKindInternal.Tag);
}
if (EndOfFile)
{
EndTagBlock(tags, complete: true);
}
else
{
_bufferedOpenAngle = null;
_lastTagStart = CurrentStart;
Assert(SyntaxKind.OpenAngle);
_bufferedOpenAngle = CurrentToken;
var tagStart = CurrentStart;
if (!NextToken())
{
Accept(_bufferedOpenAngle);
EndTagBlock(tags, complete: false);
}
else
{
complete = AfterTagStart(tagStart, tags, atSpecialTag, tagBlockWrapper);
}
}
if (complete)
{
// Completed tags have no accepted characters inside of blocks.
Span.EditHandler.AcceptedCharacters = AcceptedCharactersInternal.None;
}
// Output the contents of the tag into its own markup span.
Output(SpanKindInternal.Markup);
}
finally
{
// Will be null if we were at end of file or special tag when initially created.
if (tagBlockWrapper != null)
{
// End tag block
tagBlockWrapper.Dispose();
}
}
}
while (tags.Count > 0);
EndTagBlock(tags, complete);
}
private bool AfterTagStart(SourceLocation tagStart,
Stack<Tuple<SyntaxToken, SourceLocation>> tags,
bool atSpecialTag,
IDisposable tagBlockWrapper)
{
if (!EndOfFile)
{
switch (CurrentToken.Kind)
{
case SyntaxKind.ForwardSlash:
// End Tag
return EndTag(tagStart, tags, tagBlockWrapper);
case SyntaxKind.Bang:
// Comment, CDATA, DOCTYPE, or a parser-escaped HTML tag.
if (atSpecialTag)
{
Accept(_bufferedOpenAngle);
return BangTag();
}
else
{
goto default;
}
case SyntaxKind.QuestionMark:
// XML PI
Accept(_bufferedOpenAngle);
return XmlPI();
default:
// Start Tag
return StartTag(tags, tagBlockWrapper);
}
}
if (tags.Count == 0)
{
Context.ErrorSink.OnError(
RazorDiagnosticFactory.CreateParsing_OuterTagMissingName(
new SourceSpan(CurrentStart, contentLength: 1 /* end of file */)));
}
return false;
}
private bool XmlPI()
{
// Accept "?"
Assert(SyntaxKind.QuestionMark);
AcceptAndMoveNext();
return AcceptUntilAll(SyntaxKind.QuestionMark, SyntaxKind.CloseAngle);
}
private bool BangTag()
{
// Accept "!"
Assert(SyntaxKind.Bang);
if (AcceptAndMoveNext())
{
if (IsHtmlCommentAhead())
{
using (Context.Builder.StartBlock(BlockKindInternal.HtmlComment))
{
// Accept the double-hyphen token at the beginning of the comment block.
AcceptAndMoveNext();
Output(SpanKindInternal.Markup, AcceptedCharactersInternal.None);
Span.EditHandler.AcceptedCharacters = AcceptedCharactersInternal.Whitespace;
while (!EndOfFile)
{
SkipToAndParseCode(SyntaxKind.DoubleHyphen);
var lastDoubleHyphen = AcceptAllButLastDoubleHyphens();
if (At(SyntaxKind.CloseAngle))
{
// Output the content in the comment block as a separate markup
Output(SpanKindInternal.Markup, AcceptedCharactersInternal.Whitespace);
// This is the end of a comment block
Accept(lastDoubleHyphen);
AcceptAndMoveNext();
Output(SpanKindInternal.Markup, AcceptedCharactersInternal.None);
return true;
}
else if (lastDoubleHyphen != null)
{
Accept(lastDoubleHyphen);
}
}
}
}
else if (CurrentToken.Kind == SyntaxKind.LeftBracket)
{
if (AcceptAndMoveNext())
{
return CData();
}
}
else
{
AcceptAndMoveNext();
return AcceptUntilAll(SyntaxKind.CloseAngle);
}
}
return false;
}
protected SyntaxToken AcceptAllButLastDoubleHyphens()
{
var lastDoubleHyphen = CurrentToken;
AcceptWhile(s =>
{
if (NextIs(SyntaxKind.DoubleHyphen))
{
lastDoubleHyphen = s;
return true;
}
return false;
});
NextToken();
if (At(SyntaxKind.Text) && IsHyphen(CurrentToken))
{
// Doing this here to maintain the order of tokens
if (!NextIs(SyntaxKind.CloseAngle))
{
Accept(lastDoubleHyphen);
lastDoubleHyphen = null;
}
AcceptAndMoveNext();
}
return lastDoubleHyphen;
}
internal static bool IsHyphen(SyntaxToken token)
{
return token.Kind == SyntaxKind.Text && token.Content == "-";
}
protected bool IsHtmlCommentAhead()
{
// From HTML5 Specification, available at http://www.w3.org/TR/html52/syntax.html#comments
// Comments must have the following format:
// 1. The string "<!--"
// 2. Optionally, text, with the additional restriction that the text
// 2.1 must not start with the string ">" nor start with the string "->"
// 2.2 nor contain the strings
// 2.2.1 "<!--"
// 2.2.2 "-->" As we will be treating this as a comment ending, there is no need to handle this case at all.
// 2.2.3 "--!>"
// 2.3 nor end with the string "<!-".
// 3. The string "-->"
if (CurrentToken.Kind != SyntaxKind.DoubleHyphen)
{
return false;
}
// Check condition 2.1
if (NextIs(SyntaxKind.CloseAngle) || NextIs(next => IsHyphen(next) && NextIs(SyntaxKind.CloseAngle)))
{
return false;
}
// Check condition 2.2
var isValidComment = false;
LookaheadUntil((token, prevTokens) =>
{
if (token.Kind == SyntaxKind.DoubleHyphen)
{
if (NextIs(SyntaxKind.CloseAngle))
{
// Check condition 2.3: We're at the end of a comment. Check to make sure the text ending is allowed.
isValidComment = !IsCommentContentEndingInvalid(prevTokens);
return true;
}
else if (NextIs(ns => IsHyphen(ns) && NextIs(SyntaxKind.CloseAngle)))
{
// Check condition 2.3: we're at the end of a comment, which has an extra dash.
// Need to treat the dash as part of the content and check the ending.
// However, that case would have already been checked as part of check from 2.2.1 which
// would already fail this iteration and we wouldn't get here
isValidComment = true;
return true;
}
else if (NextIs(ns => ns.Kind == SyntaxKind.Bang && NextIs(SyntaxKind.CloseAngle)))
{
// This is condition 2.2.3
isValidComment = false;
return true;
}
}
else if (token.Kind == SyntaxKind.OpenAngle)
{
// Checking condition 2.2.1
if (NextIs(ns => ns.Kind == SyntaxKind.Bang && NextIs(SyntaxKind.DoubleHyphen)))
{
isValidComment = false;
return true;
}
}
return false;
});
return isValidComment;
}
/// <summary>
/// Verifies, that the sequence doesn't end with the "<!-" HtmlTokens. Note, the first token is an opening bracket token
/// </summary>
internal static bool IsCommentContentEndingInvalid(IEnumerable<SyntaxToken> sequence)
{
var reversedSequence = sequence.Reverse();
var index = 0;
foreach (var item in reversedSequence)
{
if (!item.IsEquivalentTo(nonAllowedHtmlCommentEnding[index++]))
{
return false;
}
if (index == nonAllowedHtmlCommentEnding.Length)
{
return true;
}
}
return false;
}
private bool CData()
{
if (CurrentToken.Kind == SyntaxKind.Text && string.Equals(CurrentToken.Content, "cdata", StringComparison.OrdinalIgnoreCase))
{
if (AcceptAndMoveNext())
{
if (CurrentToken.Kind == SyntaxKind.LeftBracket)
{
return AcceptUntilAll(SyntaxKind.RightBracket, SyntaxKind.RightBracket, SyntaxKind.CloseAngle);
}
}
}
return false;
}
private bool EndTag(SourceLocation tagStart,
Stack<Tuple<SyntaxToken, SourceLocation>> tags,
IDisposable tagBlockWrapper)
{
// Accept "/" and move next
Assert(SyntaxKind.ForwardSlash);
var forwardSlash = CurrentToken;
if (!NextToken())
{
Accept(_bufferedOpenAngle);
Accept(forwardSlash);
return false;
}
else
{
var tagName = string.Empty;
SyntaxToken bangToken = null;
if (At(SyntaxKind.Bang))
{
bangToken = CurrentToken;
var nextToken = Lookahead(count: 1);
if (nextToken != null && nextToken.Kind == SyntaxKind.Text)
{
tagName = "!" + nextToken.Content;
}
}
else if (At(SyntaxKind.Text))
{
tagName = CurrentToken.Content;
}
var matched = RemoveTag(tags, tagName, tagStart);
if (tags.Count == 0 &&
// Note tagName may contain a '!' escape character. This ensures </!text> doesn't match here.
// </!text> tags are treated like any other escaped HTML end tag.
string.Equals(tagName, SyntaxConstants.TextTagName, StringComparison.OrdinalIgnoreCase) &&
matched)
{
return EndTextTag(forwardSlash, tagBlockWrapper);
}
Accept(_bufferedOpenAngle);
Accept(forwardSlash);
OptionalBangEscape();
AcceptUntil(SyntaxKind.CloseAngle);
// Accept the ">"
return Optional(SyntaxKind.CloseAngle);
}
}
private void RecoverTextTag()
{
// We don't want to skip-to and parse because there shouldn't be anything in the body of text tags.
AcceptUntil(SyntaxKind.CloseAngle, SyntaxKind.NewLine);
// Include the close angle in the text tag block if it's there, otherwise just move on
Optional(SyntaxKind.CloseAngle);
}
private bool EndTextTag(SyntaxToken solidus, IDisposable tagBlockWrapper)
{
Accept(_bufferedOpenAngle);
Accept(solidus);
var textLocation = CurrentStart;
Assert(SyntaxKind.Text);
AcceptAndMoveNext();
var seenCloseAngle = Optional(SyntaxKind.CloseAngle);
if (!seenCloseAngle)
{
Context.ErrorSink.OnError(
RazorDiagnosticFactory.CreateParsing_TextTagCannotContainAttributes(
new SourceSpan(textLocation, contentLength: 4 /* text */)));
Span.EditHandler.AcceptedCharacters = AcceptedCharactersInternal.Any;
RecoverTextTag();
}
else
{
Span.EditHandler.AcceptedCharacters = AcceptedCharactersInternal.None;
}
Span.ChunkGenerator = SpanChunkGenerator.Null;
CompleteTagBlockWithSpan(tagBlockWrapper, Span.EditHandler.AcceptedCharacters, SpanKindInternal.Transition);
return seenCloseAngle;
}
// Special tags include <!--, <!DOCTYPE, <![CDATA and <? tags
private bool AtSpecialTag
{
get
{
if (At(SyntaxKind.OpenAngle))
{
if (NextIs(SyntaxKind.Bang))
{
return !IsBangEscape(lookahead: 1);
}
return NextIs(SyntaxKind.QuestionMark);
}
return false;
}
}
private bool IsTagRecoveryStopPoint(SyntaxToken token)
{
return token.Kind == SyntaxKind.CloseAngle ||
token.Kind == SyntaxKind.ForwardSlash ||
token.Kind == SyntaxKind.OpenAngle ||
token.Kind == SyntaxKind.SingleQuote ||
token.Kind == SyntaxKind.DoubleQuote;
}
private void TagContent()
{
if (!At(SyntaxKind.Whitespace) && !At(SyntaxKind.NewLine))
{
// We should be right after the tag name, so if there's no whitespace or new line, something is wrong
RecoverToEndOfTag();
}
else
{
// We are here ($): <tag$ foo="bar" biz="~/Baz" />
while (!EndOfFile && !IsEndOfTag())
{
BeforeAttribute();
}
}
}
private bool IsEndOfTag()
{
if (At(SyntaxKind.ForwardSlash))
{
if (NextIs(SyntaxKind.CloseAngle))
{
return true;
}
else
{
AcceptAndMoveNext();
}
}
return At(SyntaxKind.CloseAngle) || At(SyntaxKind.OpenAngle);
}
private void BeforeAttribute()
{
// http://dev.w3.org/html5/spec/tokenization.html#before-attribute-name-state
// Capture whitespace
var whitespace = ReadWhile(token => token.Kind == SyntaxKind.Whitespace || token.Kind == SyntaxKind.NewLine);
if (At(SyntaxKind.Transition) || At(SyntaxKind.RazorCommentTransition))
{
// Transition outside of attribute value => Switch to recovery mode
Accept(whitespace);
RecoverToEndOfTag();
return;
}
// http://dev.w3.org/html5/spec/tokenization.html#attribute-name-state
// Read the 'name' (i.e. read until the '=' or whitespace/newline)
var name = Enumerable.Empty<SyntaxToken>();
var whitespaceAfterAttributeName = Enumerable.Empty<SyntaxToken>();
if (IsValidAttributeNameToken(CurrentToken))
{
name = ReadWhile(token =>
token.Kind != SyntaxKind.Whitespace &&
token.Kind != SyntaxKind.NewLine &&
token.Kind != SyntaxKind.Equals &&
token.Kind != SyntaxKind.CloseAngle &&
token.Kind != SyntaxKind.OpenAngle &&
(token.Kind != SyntaxKind.ForwardSlash || !NextIs(SyntaxKind.CloseAngle)));
// capture whitespace after attribute name (if any)
whitespaceAfterAttributeName = ReadWhile(
token => token.Kind == SyntaxKind.Whitespace || token.Kind == SyntaxKind.NewLine);
}
else
{
// Unexpected character in tag, enter recovery
Accept(whitespace);
RecoverToEndOfTag();
return;
}
if (!At(SyntaxKind.Equals))
{
// Minimized attribute
// We are at the prefix of the next attribute or the end of tag. Put it back so it is parsed later.
PutCurrentBack();
PutBack(whitespaceAfterAttributeName);
// Output anything prior to the attribute, in most cases this will be the tag name:
// |<input| checked />. If in-between other attributes this will noop or output malformed attribute
// content (if the previous attribute was malformed).
Output(SpanKindInternal.Markup);
using (Context.Builder.StartBlock(BlockKindInternal.Markup))
{
Accept(whitespace);
Accept(name);
Output(SpanKindInternal.Markup);
}
return;
}
// Not a minimized attribute, parse as if it were well-formed (if attribute turns out to be malformed we
// will go into recovery).
Output(SpanKindInternal.Markup);
// Start a new markup block for the attribute
using (Context.Builder.StartBlock(BlockKindInternal.Markup))
{
AttributePrefix(whitespace, name, whitespaceAfterAttributeName);
}
}
private void AttributePrefix(
IEnumerable<SyntaxToken> whitespace,
IEnumerable<SyntaxToken> nameTokens,
IEnumerable<SyntaxToken> whitespaceAfterAttributeName)
{
// First, determine if this is a 'data-' attribute (since those can't use conditional attributes)
var name = string.Concat(nameTokens.Select(s => s.Content));
var attributeCanBeConditional =
Context.FeatureFlags.EXPERIMENTAL_AllowConditionalDataDashAttributes ||
!name.StartsWith("data-", StringComparison.OrdinalIgnoreCase);
// Accept the whitespace and name
Accept(whitespace);
Accept(nameTokens);
// Since this is not a minimized attribute, the whitespace after attribute name belongs to this attribute.
Accept(whitespaceAfterAttributeName);
Assert(SyntaxKind.Equals); // We should be at "="
AcceptAndMoveNext();
var whitespaceAfterEquals = ReadWhile(token => token.Kind == SyntaxKind.Whitespace || token.Kind == SyntaxKind.NewLine);
var quote = SyntaxKind.Unknown;
if (At(SyntaxKind.SingleQuote) || At(SyntaxKind.DoubleQuote))
{
// Found a quote, the whitespace belongs to this attribute.
Accept(whitespaceAfterEquals);
quote = CurrentToken.Kind;
AcceptAndMoveNext();
}
else if (whitespaceAfterEquals.Any())
{
// No quotes found after the whitespace. Put it back so that it can be parsed later.
PutCurrentBack();
PutBack(whitespaceAfterEquals);
}
// We now have the prefix: (i.e. ' foo="')
var prefix = new LocationTagged<string>(string.Concat(Span.Tokens.Select(s => s.Content)), Span.Start);
if (attributeCanBeConditional)
{
Span.ChunkGenerator = SpanChunkGenerator.Null; // The block chunk generator will render the prefix
Output(SpanKindInternal.Markup);
// Read the attribute value only if the value is quoted
// or if there is no whitespace between '=' and the unquoted value.
if (quote != SyntaxKind.Unknown || !whitespaceAfterEquals.Any())
{
// Read the attribute value.
while (!EndOfFile && !IsEndOfAttributeValue(quote, CurrentToken))
{
AttributeValue(quote);
}
}
// Capture the suffix
var suffix = new LocationTagged<string>(string.Empty, CurrentStart);
if (quote != SyntaxKind.Unknown && At(quote))
{
suffix = new LocationTagged<string>(CurrentToken.Content, CurrentStart);
AcceptAndMoveNext();
}
if (Span.Tokens.Count > 0)
{
// Again, block chunk generator will render the suffix
Span.ChunkGenerator = SpanChunkGenerator.Null;
Output(SpanKindInternal.Markup);