public override SelectorMatcher GetCombinator(SelectorMatcher left)
{
// 14.2. Child combinator (>)
// https://www.w3.org/TR/selectors-4/#child-combinators
return((in SelectorMatcherContext ctx) =>
{
return ctx.Node.Parent != null && left(ctx.WithSyntaxNode(ctx.Node.Parent));
});
public override SelectorMatcher GetMatcher()
{
SelectorMatcher matcher = (in SelectorMatcherContext ctx) => false;
foreach (var selector in Children)
{
matcher = SelectorCompilerHelper.ComposeOr(SelectorCompiler.Compile(selector), matcher);
}
return(matcher);
}
public override SelectorMatcher GetMatcher()
{
SelectorMatcher composedMatcher = (in SelectorMatcherContext _) => true;
for (var i = Children.Count - 1; i >= 0; i--)
{
var child = Children[i];
var matcher = child.GetMatcher();
composedMatcher = SelectorCompilerHelper.ComposeAnd(composedMatcher, matcher);
}
return(composedMatcher);
}
public override SelectorMatcher GetMatcher()
{
SelectorMatcher matcher = (in SelectorMatcherContext _) => false;
foreach (var selector in _relativeSelectors)
{
matcher = SelectorCompilerHelper.ComposeOr(matcher, selector.GetMatcher());
}
var query = new QulalySelector(matcher, this);
return((in SelectorMatcherContext ctx) =>
{
return ctx.Node.QuerySelector(query) != null;
});
public override SelectorMatcher GetCombinator(SelectorMatcher left)
{
// 14.1. Descendant combinator ( )
// https://www.w3.org/TR/selectors-4/#descendant-combinators
return((in SelectorMatcherContext ctx) =>
{
var parent = ctx.Node.Parent;
while (parent != null)
{
if (left(ctx.WithSyntaxNode(parent)))
{
return true;
}
parent = parent.Parent;
}
return false;
});
public override SelectorMatcher GetCombinator(SelectorMatcher left)
{
// 14.3. Next-sibling combinator (+)
// The elements represented by the two compound selectors share the same parent
// in the document tree and the element represented by the first compound selector
// immediately precedes the element represented by the second one.
// https://www.w3.org/TR/selectors-4/#adjacent-sibling-combinators
return((in SelectorMatcherContext ctx) =>
{
var node = ctx.Node;
if (ctx.Node.Parent == null)
{
return false;
}
var beforeNode = ctx.Node.Parent.ChildNodes().TakeWhile(x => x != node).LastOrDefault();
return beforeNode != null && left(ctx.WithSyntaxNode(beforeNode));
});
public override SelectorMatcher GetCombinator(SelectorMatcher left)
{
// Subsequent-sibling combinator (~)
// The elements represented by the two compound selectors share the same parent
// in the document tree and the element represented by the first compound selector
// precedes (not necessarily immediately) the element represented by the second one.
// https://www.w3.org/TR/selectors-4/#general-sibling-combinators
return((in SelectorMatcherContext ctx) =>
{
var node = ctx.Node;
if (ctx.Node.Parent == null)
{
return false;
}
var beforeNodes = ctx.Node.Parent.ChildNodes().TakeWhile(x => x != node).ToList(); // before self.
var ctx_ = ctx;
return beforeNodes.Any(x => left(ctx_.WithSyntaxNode(x)));
});
public override void OnValueReady(CssLexer lexer)
{
// Create the set:
List <SelectorMatcher> multi = new List <SelectorMatcher>();
for (int i = 0; i < Count; i++)
{
// Read and add:
SelectorMatcher sm = Css.CssLexer.ReadSelectorMatcher(this[i]);
if (sm == null)
{
// Entire any should be ignored.
return;
}
multi.Add(sm);
}
Matchers = multi.ToArray();
}
public static SelectorMatcher Compile(SelectorElement selector)
{
SelectorMatcher composedMatcher = (in SelectorMatcherContext _) => true;
if (selector is SelectorList <SelectorElement> selectorList)
{
for (var i = 0; i < selectorList.Children.Count; i++)
{
var child = selectorList.Children[i];
if (child is Combinator combinator)
{
var matcher = combinator.GetCombinator(composedMatcher);
composedMatcher = SelectorCompilerHelper.ComposeAnd(matcher, Compile(selectorList.Children[i + 1]));
}
else if (child is Selector childSelector)
{
var matcher = childSelector.GetMatcher();
composedMatcher = SelectorCompilerHelper.ComposeAnd(composedMatcher, matcher);
}
}
}
return(composedMatcher);
}
public static SelectorMatcher ComposeOr(SelectorMatcher left, SelectorMatcher right)
{
return((in SelectorMatcherContext ctx) => right(ctx) || left(ctx));
}
public QulalySelector(SelectorMatcher matcher, Selector selector)
{
Matcher = matcher;
Selector = selector;
}
private static bool MatchesOnVisualTree(SelectorMatcher lastFragment)
{
return(lastFragment.Type == CssParsing.CssNodeType.PseudoSelector &&
lastFragment.Text == ":visualtree");
}
public abstract SelectorMatcher GetCombinator(SelectorMatcher left);
