matthiasblaesing opened a new pull request, #5432:
URL: https://github.com/apache/netbeans/pull/5432
**Support recursive CSS property definitions (calc function with embedded
function calls)**
The grammar for calc property values failed to parse embedded var and
calc calls correctly. The issue is the work-around introduces as
function-content, which basicly prevents nesting any expression that
contains braces.
This changes the grammar parsing result from a tree to a directed graph,
which can contain cycles. This needs to taken into account by useers of
the parsed grammar.
An example of such a cycle is:
```
calc-fn -> calc-sum -> calc-product -> calc-value -> calc-sum
^ |
+----------------------------------------+
```
For example this is now supported:
```css
.header {
height: calc(28 * var(--spacing-unit));
}
```
**Improve compatibility for custom properties**
Custom properties can hold more or less arbitrary content. This was not
parsed and is now:
```css
:root {
--grid-gutter: (var(--margins) * var(--spacing-unit));
--cell-margin: (var(--grid-gutter) / 2);
}
```
**Support CSS :has pseudo-class**
This was not parsed and is now:
```css
body:has(+ #aCheck:checked) {
background-color:red;
}
```
Closes: #5052
Closes: #5303
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