public static ElementSchemaPointerPart ParseSchemaData(XPointerLexer lexer)
{
//Productions:
//[1] ElementSchemeData ::= (NCName ChildSequence?) | ChildSequence
//[2] ChildSequence ::= ('/' [1-9] [0-9]*)+
var xpathBuilder = new StringBuilder();
var part = new ElementSchemaPointerPart();
lexer.NextLexeme();
if (lexer.Kind == XPointerLexer.LexKind.NcName)
{
xpathBuilder.Append("id('");
xpathBuilder.Append(lexer.NcName);
xpathBuilder.Append("')");
lexer.NextLexeme();
}
var childSequenceLen = 0;
while (lexer.Kind == XPointerLexer.LexKind.Slash)
{
lexer.NextLexeme();
if (lexer.Kind != XPointerLexer.LexKind.Number)
{
Debug.WriteLine(Resources.InvalidTokenInElementSchemeWhileNumberExpected);
return(null);
}
if (lexer.Number == 0)
{
Debug.WriteLine(Resources.ZeroIndexInElementSchemechildSequence);
return(null);
}
childSequenceLen++;
xpathBuilder.Append("/*[");
xpathBuilder.Append(lexer.Number);
xpathBuilder.Append("]");
lexer.NextLexeme();
}
if (lexer.Kind != XPointerLexer.LexKind.RrBracket)
{
throw new XPointerSyntaxException(Resources.InvalidTokenInElementSchemeWhileClosingRoundBracketExpected);
}
if (xpathBuilder.Length == 0 && childSequenceLen == 0)
{
Debug.WriteLine(Resources.EmptyElementSchemeXPointer);
return(null);
}
part.XPath = xpathBuilder.ToString();
return(part);
}
public static Pointer ParseXPointer(string xpointer)
{
var lexer = new XPointerLexer(xpointer);
lexer.NextLexeme();
if (lexer.Kind == XPointerLexer.LexKind.NcName && !lexer.CanBeSchemaName)
{
//Shorthand pointer
Pointer ptr = new ShorthandPointer(lexer.NcName);
lexer.NextLexeme();
if (lexer.Kind != XPointerLexer.LexKind.Eof)
{
throw new XPointerSyntaxException(Resources.InvalidTokenAfterShorthandPointer);
}
return(ptr);
}
//SchemaBased pointer
IList <PointerPart> parts = new List <PointerPart>();
while (lexer.Kind != XPointerLexer.LexKind.Eof)
{
if ((lexer.Kind == XPointerLexer.LexKind.NcName ||
lexer.Kind == XPointerLexer.LexKind.QName) &&
lexer.CanBeSchemaName)
{
var schemaType = GetSchema(lexer, parts);
//Move to '('
lexer.NextLexeme();
switch (schemaType)
{
case XPointerSchema.SchemaType.Element:
var elemPart = ElementSchemaPointerPart.ParseSchemaData(lexer);
if (elemPart != null)
{
parts.Add(elemPart);
}
break;
case XPointerSchema.SchemaType.Xmlns:
var xmlnsPart = XmlnsSchemaPointerPart.ParseSchemaData(lexer);
if (xmlnsPart != null)
{
parts.Add(xmlnsPart);
}
break;
case XPointerSchema.SchemaType.XPath1:
var xpath1Part = XPath1SchemaPointerPart.ParseSchemaData(lexer);
if (xpath1Part != null)
{
parts.Add(xpath1Part);
}
break;
case XPointerSchema.SchemaType.XPointer:
var xpointerPart = XPointerSchemaPointerPart.ParseSchemaData(lexer);
if (xpointerPart != null)
{
parts.Add(xpointerPart);
}
break;
default:
//Unknown scheme
lexer.ParseEscapedData();
break;
}
//Skip ')'
lexer.NextLexeme();
//Skip possible whitespace
if (lexer.Kind == XPointerLexer.LexKind.Space)
{
lexer.NextLexeme();
}
}
else
{
throw new XPointerSyntaxException(Resources.InvalidToken);
}
}
return(new SchemaBasedPointer(parts, xpointer));
}
