/// <summary> /// Parse the productions: /// implicit_document ::= block_node DOCUMENT-END* /// * /// explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END* /// ************************* /// </summary> private ParsingEvent ParseDocumentStart(bool isImplicit) { // Parse extra document end indicators. if (!isImplicit) { while (GetCurrentToken() is DocumentEnd) { Skip(); } } // Parse an isImplicit document. if (isImplicit && !(GetCurrentToken() is VersionDirective || GetCurrentToken() is TagDirective || GetCurrentToken() is DocumentStart || GetCurrentToken() is StreamEnd)) { TagDirectiveCollection directives = new TagDirectiveCollection(); ProcessDirectives(directives); states.Push(ParserState.DocumentEnd); state = ParserState.BlockNode; return(new Events.DocumentStart(null, directives, true, GetCurrentToken().Start, GetCurrentToken().End)); } // Parse an explicit document. else if (!(GetCurrentToken() is StreamEnd)) { Mark start = GetCurrentToken().Start; TagDirectiveCollection directives = new TagDirectiveCollection(); VersionDirective versionDirective = ProcessDirectives(directives); var current = GetCurrentToken(); if (!(current is DocumentStart)) { throw new SemanticErrorException(current.Start, current.End, "Did not find expected <document start>."); } states.Push(ParserState.DocumentEnd); state = ParserState.DocumentContent; ParsingEvent evt = new Events.DocumentStart(versionDirective, directives, false, start, current.End); Skip(); return(evt); } // Parse the stream end. else { state = ParserState.StreamEnd; ParsingEvent evt = new Events.StreamEnd(GetCurrentToken().Start, GetCurrentToken().End); // Do not call skip here because that would throw an exception if (scanner.MoveNextWithoutConsuming()) { throw new InvalidOperationException("The scanner should contain no more tokens."); } return(evt); } }
void IParsingEventVisitor.Visit(DocumentStart e) { throw new NotSupportedException(); }