private bool ParseChild()
{
if (Current.Type != TokenType.String)
{
return(false);
}
var name = Current.Value;
int index = -1;
if (name == "*")
{
return(false);
}
if (LA.Type == TokenType.LBracket)
{
var _ = MoveNext() &&
MoveNext() &&
ParseIndex(out index) &&
Require(TokenType.RBracket);
}
_result = _result.Element(name, index);
return(true);
}
// attr = '@' name
private bool ParseAttribute()
{
if (Require(TokenType.String))
{
_result = _result.Attribute(Current.Value);
return(true);
}
return(false);
}
private bool ParseDescendant()
{
if (Current.Type != TokenType.Asterisk)
{
return(false);
}
DomPath path = _result;
return(MoveNext() && ParseHasAttribute());
}
internal bool Parse(out DomPath result)
{
_result = DomPath.Root;
while (MoveNext() && ParseAxis())
{
}
result = _result;
if (Current.Type == TokenType.EOF)
{
return(true);
}
return(Current.Type == TokenType.EOF);
}
private bool ParseHasAttribute()
{
DomName name = null;
var success = Require(TokenType.LBracket) &&
MoveNext() &&
Require(TokenType.AtSign) &&
MoveNext() &&
ParseName(out name);
if (success && Current.Type == TokenType.EqualSign)
{
MoveNext();
_result = _result.DescendantHasAttributeValue(name, Current.Value);
return(MoveNext());
}
_result = _result.DescendantHasAttribute(name);
return(success);
}
public DomPathLeaf(DomPath parent, DomPathExpression expression)
{
_parent = parent;
_expression = expression;
}
public static bool TryParse(string text, out DomPath result)
{
var parser = new DomPathParser(text);
return(parser.Parse(out result));
}
