public CssSelector GetCombinatorSelector(string sel)
{
string newSel = sel.Replace("+", " + ").Replace("~", " ~ ").Replace(">", " > ");
string[] sep = new string[] { " " };
List <string> basicSels = newSel.Split(sep, StringSplitOptions.RemoveEmptyEntries).ToList();
int j = basicSels.Count - 1;
if (j == 0)
{
BasicCssSelector selector = (BasicCssSelector)GetBasicSelector(basicSels[j]);
return(selector);
}
else
{
Stack <CssSelector> stack = new Stack <CssSelector>();
while (j >= 0)
{
CombinatorCssSelector current = null;
CssSelector selectorRight = null;
if (stack.Count == 0)
{
selectorRight = (BasicCssSelector)GetBasicSelector(basicSels[j]);
j--;
}
else
{
selectorRight = stack.Pop();
}
string symbol = basicSels[j];
current = (CombinatorCssSelector)GetCurrentSelector(symbol);
j--;
if (j < 0)
{
current.right = selectorRight;
break;
}
BasicCssSelector selectorLeft = (BasicCssSelector)GetBasicSelector(basicSels[j]);
current.left = selectorLeft;
current.right = selectorRight;
stack.Push(current);
j--;
}
return(stack.Pop());
}
}
public List <CssSelector> ParseCssSelectorList(List <string> tokens, ref int index)
{
List <CssSelector> selectors = new List <CssSelector>();
string[] sep = new string[] { "," };
List <string> selStrs = tokens[index].Split(sep, StringSplitOptions.RemoveEmptyEntries).Select(s => s.Trim()).ToList();
//for exam : A > B > C, #id + * > .cls
foreach (var sel in selStrs)
{
(sel.Length > 0).OrThrow("Css Syntax Error:Selector parse error.Length should > 0");
CssSelector selector = GetCombinatorSelector(sel);// #id + * > .cls
selectors.Add(selector);
}
return(selectors);
}
public CssSelector GetBasicSelector(string sel)
{
CssSelector selector = null;
CssSelectorType type = CssSelectorType.Unkown;
if (sel[0] == '#')
{
type = CssSelectorType.IdSelector;
selector = new BasicCssSelector(sel.Substring(1), type, "#");
}
else if (sel[0] == '.')
{
type = CssSelectorType.ClassSelector;
selector = new BasicCssSelector(sel.Substring(1), type, ".");
}
else if (sel[0] == '[')
{
type = CssSelectorType.AttributeSelector;
selector = new BasicCssSelector(sel.Substring(1, sel.Length - 2), type, "[");
}
else if (sel[0] == ':')
{
if (sel[1] == ':')
{
type = CssSelectorType.PseudoElement;
selector = new BasicCssSelector(sel.Substring(2), type, "::");
}
else
{
type = CssSelectorType.PseudoClass;
selector = new BasicCssSelector(sel.Substring(1), type, ":");
}
}
else if (Char.IsLetter(sel[0]))
{
type = CssSelectorType.ElementSelector;
selector = new BasicCssSelector(sel.Substring(1), type, "");
}
return(selector);
}
public CssSelector GetCurrentSelector(string symbol)
{
CssSelector current = null;
if (symbol.Equals("+"))
{
current = new CombinatorCssSelector("+", CssSelectorType.AdjacentSiblingSelector);
}
else if (symbol.Equals("~"))
{
current = new CombinatorCssSelector("~", CssSelectorType.GeneralSiblingSelector);
}
else if (symbol.Equals(">"))
{
current = new CombinatorCssSelector(">", CssSelectorType.ChildSelector);
}
else
{
current = new CombinatorCssSelector("", CssSelectorType.DescendantSelector);
(current as CombinatorCssSelector).left = GetBasicSelector(symbol);
}
return(current);
}
