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node_modules/csso/lib/clean/Rule.js

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+var hasOwnProperty = Object.prototype.hasOwnProperty;
+var walk = require('css-tree').walk;
+var { hasNoChildren } = require('./utils');
+
+function cleanUnused(selectorList, usageData) {
+    selectorList.children.each(function(selector, item, list) {
+        var shouldRemove = false;
+
+        walk(selector, function(node) {
+            // ignore nodes in nested selectors
+            if (this.selector === null || this.selector === selectorList) {
+                switch (node.type) {
+                    case 'SelectorList':
+                        // TODO: remove toLowerCase when pseudo selectors will be normalized
+                        // ignore selectors inside :not()
+                        if (this.function === null || this.function.name.toLowerCase() !== 'not') {
+                            if (cleanUnused(node, usageData)) {
+                                shouldRemove = true;
+                            }
+                        }
+                        break;
+
+                    case 'ClassSelector':
+                        if (usageData.whitelist !== null &&
+                            usageData.whitelist.classes !== null &&
+                            !hasOwnProperty.call(usageData.whitelist.classes, node.name)) {
+                            shouldRemove = true;
+                        }
+                        if (usageData.blacklist !== null &&
+                            usageData.blacklist.classes !== null &&
+                            hasOwnProperty.call(usageData.blacklist.classes, node.name)) {
+                            shouldRemove = true;
+                        }
+                        break;
+
+                    case 'IdSelector':
+                        if (usageData.whitelist !== null &&
+                            usageData.whitelist.ids !== null &&
+                            !hasOwnProperty.call(usageData.whitelist.ids, node.name)) {
+                            shouldRemove = true;
+                        }
+                        if (usageData.blacklist !== null &&
+                            usageData.blacklist.ids !== null &&
+                            hasOwnProperty.call(usageData.blacklist.ids, node.name)) {
+                            shouldRemove = true;
+                        }
+                        break;
+
+                    case 'TypeSelector':
+                        // TODO: remove toLowerCase when type selectors will be normalized
+                        // ignore universal selectors
+                        if (node.name.charAt(node.name.length - 1) !== '*') {
+                            if (usageData.whitelist !== null &&
+                                usageData.whitelist.tags !== null &&
+                                !hasOwnProperty.call(usageData.whitelist.tags, node.name.toLowerCase())) {
+                                shouldRemove = true;
+                            }
+                            if (usageData.blacklist !== null &&
+                                usageData.blacklist.tags !== null &&
+                                hasOwnProperty.call(usageData.blacklist.tags, node.name.toLowerCase())) {
+                                shouldRemove = true;
+                            }
+                        }
+                        break;
+                }
+            }
+        });
+
+        if (shouldRemove) {
+            list.remove(item);
+        }
+    });
+
+    return selectorList.children.isEmpty();
+}
+
+module.exports = function cleanRule(node, item, list, options) {
+    if (hasNoChildren(node.prelude) || hasNoChildren(node.block)) {
+        list.remove(item);
+        return;
+    }
+
+    var usageData = options.usage;
+
+    if (usageData && (usageData.whitelist !== null || usageData.blacklist !== null)) {
+        cleanUnused(node.prelude, usageData);
+
+        if (hasNoChildren(node.prelude)) {
+            list.remove(item);
+            return;
+        }
+    }
+};