1 files changed, 103 insertions, 0 deletions
diff --git a/vanilla/node_modules/css-tree/lib/syntax/node/Feature.js b/vanilla/node_modules/css-tree/lib/syntax/node/Feature.js
new file mode 100644
index 0000000..2f2dc3d
--- /dev/null
+++ b/vanilla/node_modules/css-tree/lib/syntax/node/Feature.js
@@ -0,0 +1,103 @@
+import {
+    Ident,
+    Number,
+    Dimension,
+    Function as FunctionToken,
+    LeftParenthesis,
+    RightParenthesis,
+    Colon,
+    Delim
+} from '../../tokenizer/index.js';
+
+const SOLIDUS = 0x002F;  // U+002F SOLIDUS (/)
+
+export const name = 'Feature';
+export const structure = {
+    kind: String,
+    name: String,
+    value: ['Identifier', 'Number', 'Dimension', 'Ratio', 'Function', null]
+};
+
+export function parse(kind) {
+    const start = this.tokenStart;
+    let name;
+    let value = null;
+
+    this.eat(LeftParenthesis);
+    this.skipSC();
+
+    name = this.consume(Ident);
+    this.skipSC();
+
+    if (this.tokenType !== RightParenthesis) {
+        this.eat(Colon);
+        this.skipSC();
+
+        switch (this.tokenType) {
+            case Number:
+                if (this.lookupNonWSType(1) === Delim) {
+                    value = this.Ratio();
+                } else {
+                    value = this.Number();
+                }
+
+                break;
+
+            case Dimension:
+                value = this.Dimension();
+                break;
+
+            case Ident:
+                value = this.Identifier();
+                break;
+
+            case FunctionToken:
+                value = this.parseWithFallback(
+                    () => {
+                        const res = this.Function(this.readSequence, this.scope.Value);
+
+                        this.skipSC();
+
+                        if (this.isDelim(SOLIDUS)) {
+                            this.error();
+                        }
+
+                        return res;
+                    },
+                    () => {
+                        return this.Ratio();
+                    }
+                );
+                break;
+
+            default:
+                this.error('Number, dimension, ratio or identifier is expected');
+        }
+
+        this.skipSC();
+    }
+
+    if (!this.eof) {
+        this.eat(RightParenthesis);
+    }
+
+    return {
+        type: 'Feature',
+        loc: this.getLocation(start, this.tokenStart),
+        kind,
+        name,
+        value
+    };
+}
+
+export function generate(node) {
+    this.token(LeftParenthesis, '(');
+    this.token(Ident, node.name);
+
+    if (node.value !== null) {
+        this.token(Colon, ':');
+        this.node(node.value);
+    }
+
+    this.token(RightParenthesis, ')');
+}