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node_modules/css-tree/lib/syntax/node/MediaFeature.js

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+import {
+    Ident,
+    Number,
+    Dimension,
+    LeftParenthesis,
+    RightParenthesis,
+    Colon,
+    Delim
+} from '../../tokenizer/index.js';
+
+export const name = 'MediaFeature';
+export const structure = {
+    name: String,
+    value: ['Identifier', 'Number', 'Dimension', 'Ratio', null]
+};
+
+export function parse() {
+    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;
+
+            default:
+                this.error('Number, dimension, ratio or identifier is expected');
+        }
+
+        this.skipSC();
+    }
+
+    this.eat(RightParenthesis);
+
+    return {
+        type: 'MediaFeature',
+        loc: this.getLocation(start, this.tokenStart),
+        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, ')');
+}