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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System.Collections.Generic;
using System.Web.Razor.Generator;
using System.Web.Razor.Parser.SyntaxTree;
using System.Web.Razor.Text;
using System.Web.Razor.Tokenizer;
using System.Web.Razor.Tokenizer.Symbols;
namespace System.Web.Razor.Parser
{
public partial class HtmlMarkupParser : TokenizerBackedParser<HtmlTokenizer, HtmlSymbol, HtmlSymbolType>
{
//From http://dev.w3.org/html5/spec/Overview.html#elements-0
private 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 ISet<string> VoidElements
{
get { return _voidElements; }
}
protected override ParserBase OtherParser
{
get { return Context.CodeParser; }
}
protected override LanguageCharacteristics<HtmlTokenizer, HtmlSymbol, HtmlSymbolType> Language
{
get { return HtmlLanguageCharacteristics.Instance; }
}
public override void BuildSpan(SpanBuilder span, SourceLocation start, string content)
{
span.Kind = SpanKind.Markup;
span.CodeGenerator = new MarkupCodeGenerator();
base.BuildSpan(span, start, content);
}
protected override void OutputSpanBeforeRazorComment()
{
Output(SpanKind.Markup);
}
protected void SkipToAndParseCode(HtmlSymbolType type)
{
SkipToAndParseCode(sym => sym.Type == type);
}
protected void SkipToAndParseCode(Func<HtmlSymbol, bool> condition)
{
HtmlSymbol last = null;
bool startOfLine = false;
while (!EndOfFile && !condition(CurrentSymbol))
{
if (At(HtmlSymbolType.NewLine))
{
if (last != null)
{
Accept(last);
}
// Mark the start of a new line
startOfLine = true;
last = null;
AcceptAndMoveNext();
}
else if (At(HtmlSymbolType.Transition))
{
HtmlSymbol transition = CurrentSymbol;
NextToken();
if (At(HtmlSymbolType.Transition))
{
if (last != null)
{
Accept(last);
last = null;
}
Output(SpanKind.Markup);
Accept(transition);
Span.CodeGenerator = SpanCodeGenerator.Null;
Output(SpanKind.Markup);
AcceptAndMoveNext();
continue; // while
}
else
{
if (!EndOfFile)
{
PutCurrentBack();
}
PutBack(transition);
}
// Handle whitespace rewriting
if (last != null)
{
if (!Context.DesignTimeMode && last.Type == HtmlSymbolType.WhiteSpace && startOfLine)
{
// Put the whitespace back too
startOfLine = false;
PutBack(last);
last = null;
}
else
{
// Accept last
Accept(last);
last = null;
}
}
OtherParserBlock();
}
else if (At(HtmlSymbolType.RazorCommentTransition))
{
if (last != null)
{
Accept(last);
last = null;
}
AddMarkerSymbolIfNecessary();
Output(SpanKind.Markup);
RazorComment();
}
else
{
// As long as we see whitespace, we're still at the "start" of the line
startOfLine &= At(HtmlSymbolType.WhiteSpace);
// If there's a last token, accept it
if (last != null)
{
Accept(last);
last = null;
}
// Advance
last = CurrentSymbol;
NextToken();
}
}
if (last != null)
{
Accept(last);
}
}
protected static Func<HtmlSymbol, bool> IsSpacingToken(bool includeNewLines)
{
return sym => sym.Type == HtmlSymbolType.WhiteSpace || (includeNewLines && sym.Type == HtmlSymbolType.NewLine);
}
private void OtherParserBlock()
{
AddMarkerSymbolIfNecessary();
Output(SpanKind.Markup);
using (PushSpanConfig())
{
Context.SwitchActiveParser();
Context.CodeParser.ParseBlock();
Context.SwitchActiveParser();
}
Initialize(Span);
NextToken();
}
}
}
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