1 files changed, 80 insertions, 0 deletions
diff --git a/node_modules/css-tree/lib/syntax/atrule/supports.js b/node_modules/css-tree/lib/syntax/atrule/supports.js
new file mode 100644
index 00000000..9f8b56c6
--- /dev/null
+++ b/node_modules/css-tree/lib/syntax/atrule/supports.js
@@ -0,0 +1,80 @@
+import {
+    WhiteSpace,
+    Comment,
+    Ident,
+    Function,
+    Colon,
+    LeftParenthesis
+} from '../../tokenizer/index.js';
+
+function consumeRaw() {
+    return this.createSingleNodeList(
+        this.Raw(this.tokenIndex, null, false)
+    );
+}
+
+function parentheses() {
+    this.skipSC();
+
+    if (this.tokenType === Ident &&
+        this.lookupNonWSType(1) === Colon) {
+        return this.createSingleNodeList(
+            this.Declaration()
+        );
+    }
+
+    return readSequence.call(this);
+}
+
+function readSequence() {
+    const children = this.createList();
+    let child;
+
+    this.skipSC();
+
+    scan:
+    while (!this.eof) {
+        switch (this.tokenType) {
+            case Comment:
+            case WhiteSpace:
+                this.next();
+                continue;
+
+            case Function:
+                child = this.Function(consumeRaw, this.scope.AtrulePrelude);
+                break;
+
+            case Ident:
+                child = this.Identifier();
+                break;
+
+            case LeftParenthesis:
+                child = this.Parentheses(parentheses, this.scope.AtrulePrelude);
+                break;
+
+            default:
+                break scan;
+        }
+
+        children.push(child);
+    }
+
+    return children;
+}
+
+export default {
+    parse: {
+        prelude() {
+            const children = readSequence.call(this);
+
+            if (this.getFirstListNode(children) === null) {
+                this.error('Condition is expected');
+            }
+
+            return children;
+        },
+        block(isStyleBlock = false) {
+            return this.Block(isStyleBlock);
+        }
+    }
+};