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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System.Diagnostics;
using System.Web.Razor.Parser.SyntaxTree;
using System.Web.Razor.Resources;
using System.Web.Razor.Tokenizer.Symbols;
namespace System.Web.Razor.Parser
{
public partial class HtmlMarkupParser
{
private bool CaseSensitive { get; set; }
private StringComparison Comparison
{
get { return CaseSensitive ? StringComparison.Ordinal : StringComparison.OrdinalIgnoreCase; }
}
public override void ParseSection(Tuple<string, string> nestingSequences, bool caseSensitive)
{
if (Context == null)
{
throw new InvalidOperationException(RazorResources.Parser_Context_Not_Set);
}
using (PushSpanConfig(DefaultMarkupSpan))
{
using (Context.StartBlock(BlockType.Markup))
{
NextToken();
CaseSensitive = caseSensitive;
if (nestingSequences.Item1 == null)
{
NonNestingSection(nestingSequences.Item2.Split());
}
else
{
NestingSection(nestingSequences);
}
AddMarkerSymbolIfNecessary();
Output(SpanKind.Markup);
}
}
}
private void NonNestingSection(string[] nestingSequenceComponents)
{
do
{
SkipToAndParseCode(sym => sym.Type == HtmlSymbolType.OpenAngle || AtEnd(nestingSequenceComponents));
ScanTagInDocumentContext();
if (!EndOfFile && AtEnd(nestingSequenceComponents))
{
break;
}
}
while (!EndOfFile);
PutCurrentBack();
}
private void NestingSection(Tuple<string, string> nestingSequences)
{
int nesting = 1;
while (nesting > 0 && !EndOfFile)
{
SkipToAndParseCode(sym =>
sym.Type == HtmlSymbolType.Text ||
sym.Type == HtmlSymbolType.OpenAngle);
if (At(HtmlSymbolType.Text))
{
nesting += ProcessTextToken(nestingSequences, nesting);
if (CurrentSymbol != null)
{
AcceptAndMoveNext();
}
else if (nesting > 0)
{
NextToken();
}
}
else
{
ScanTagInDocumentContext();
}
}
}
private bool AtEnd(string[] nestingSequenceComponents)
{
EnsureCurrent();
if (String.Equals(CurrentSymbol.Content, nestingSequenceComponents[0], Comparison))
{
int bookmark = CurrentSymbol.Start.AbsoluteIndex;
try
{
foreach (string component in nestingSequenceComponents)
{
if (!String.Equals(CurrentSymbol.Content, component, Comparison))
{
return false;
}
NextToken();
while (!EndOfFile && IsSpacingToken(includeNewLines: true)(CurrentSymbol))
{
NextToken();
}
}
return true;
}
finally
{
Context.Source.Position = bookmark;
NextToken();
}
}
return false;
}
private int ProcessTextToken(Tuple<string, string> nestingSequences, int currentNesting)
{
for (int i = 0; i < CurrentSymbol.Content.Length; i++)
{
int nestingDelta = HandleNestingSequence(nestingSequences.Item1, i, currentNesting, 1);
if (nestingDelta == 0)
{
nestingDelta = HandleNestingSequence(nestingSequences.Item2, i, currentNesting, -1);
}
if (nestingDelta != 0)
{
return nestingDelta;
}
}
return 0;
}
private int HandleNestingSequence(string sequence, int position, int currentNesting, int retIfMatched)
{
if (sequence != null &&
CurrentSymbol.Content[position] == sequence[0] &&
position + sequence.Length <= CurrentSymbol.Content.Length)
{
string possibleStart = CurrentSymbol.Content.Substring(position, sequence.Length);
if (String.Equals(possibleStart, sequence, Comparison))
{
// Capture the current symbol and "put it back" (really we just want to clear CurrentSymbol)
int bookmark = Context.Source.Position;
HtmlSymbol sym = CurrentSymbol;
PutCurrentBack();
// Carve up the symbol
Tuple<HtmlSymbol, HtmlSymbol> pair = Language.SplitSymbol(sym, position, HtmlSymbolType.Text);
HtmlSymbol preSequence = pair.Item1;
Debug.Assert(pair.Item2 != null);
pair = Language.SplitSymbol(pair.Item2, sequence.Length, HtmlSymbolType.Text);
HtmlSymbol sequenceToken = pair.Item1;
HtmlSymbol postSequence = pair.Item2;
// Accept the first chunk (up to the nesting sequence we just saw)
if (!String.IsNullOrEmpty(preSequence.Content))
{
Accept(preSequence);
}
// Accept the sequence if it isn't the last one
if (currentNesting + retIfMatched != 0)
{
Accept(sequenceToken);
// Position at the start of the postSequence symbol
if (postSequence != null)
{
Context.Source.Position = postSequence.Start.AbsoluteIndex;
}
else
{
Context.Source.Position = bookmark;
}
}
// Return the value we were asked to return if matched, since we found a nesting sequence
return retIfMatched;
}
}
return 0;
}
}
}
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