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build/node_modules/css-tree/lib/syntax/node/Brackets.js

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+var TYPE = require('../../tokenizer').TYPE;
+var LEFTSQUAREBRACKET = TYPE.LeftSquareBracket;
+var RIGHTSQUAREBRACKET = TYPE.RightSquareBracket;
+
+// currently only Grid Layout uses square brackets, but left it universal
+// https://drafts.csswg.org/css-grid/#track-sizing
+// [ ident* ]
+module.exports = {
+    name: 'Brackets',
+    structure: {
+        children: [[]]
+    },
+    parse: function(readSequence, recognizer) {
+        var start = this.scanner.tokenStart;
+        var children = null;
+
+        this.scanner.eat(LEFTSQUAREBRACKET);
+        children = readSequence.call(this, recognizer);
+        this.scanner.eat(RIGHTSQUAREBRACKET);
+
+        return {
+            type: 'Brackets',
+            loc: this.getLocation(start, this.scanner.tokenStart),
+            children: children
+        };
+    },
+    generate: function(processChunk, node) {
+        processChunk('[');
+        this.each(processChunk, node);
+        processChunk(']');
+    }
+};