postcss,(plugins): nanocss, postcss-preset-env

1 files changed, 97 insertions, 0 deletions

diff --git a/node_modules/csso/lib/restructure/prepare/processSelector.js b/node_modules/csso/lib/restructure/prepare/processSelector.js
new file mode 100644
index 00000000..55a4fed8
--- /dev/null
+++ b/node_modules/csso/lib/restructure/prepare/processSelector.js
@@ -0,0 +1,97 @@
+import { generate } from 'css-tree';
+import specificity from './specificity.js';
+
+const nonFreezePseudoElements = new Set([
+    'first-letter',
+    'first-line',
+    'after',
+    'before'
+]);
+const nonFreezePseudoClasses = new Set([
+    'link',
+    'visited',
+    'hover',
+    'active',
+    'first-letter',
+    'first-line',
+    'after',
+    'before'
+]);
+
+export default function processSelector(node, usageData) {
+    const pseudos = new Set();
+
+    node.prelude.children.forEach(function(simpleSelector) {
+        let tagName = '*';
+        let scope = 0;
+
+        simpleSelector.children.forEach(function(node) {
+            switch (node.type) {
+                case 'ClassSelector':
+                    if (usageData && usageData.scopes) {
+                        const classScope = usageData.scopes[node.name] || 0;
+
+                        if (scope !== 0 && classScope !== scope) {
+                            throw new Error('Selector can\'t has classes from different scopes: ' + generate(simpleSelector));
+                        }
+
+                        scope = classScope;
+                    }
+
+                    break;
+
+                case 'PseudoClassSelector': {
+                    const name = node.name.toLowerCase();
+
+                    if (!nonFreezePseudoClasses.has(name)) {
+                        pseudos.add(`:${name}`);
+                    }
+
+                    break;
+                }
+
+                case 'PseudoElementSelector': {
+                    const name = node.name.toLowerCase();
+
+                    if (!nonFreezePseudoElements.has(name)) {
+                        pseudos.add(`::${name}`);
+                    }
+
+                    break;
+                }
+
+                case 'TypeSelector':
+                    tagName = node.name.toLowerCase();
+                    break;
+
+                case 'AttributeSelector':
+                    if (node.flags) {
+                        pseudos.add(`[${node.flags.toLowerCase()}]`);
+                    }
+
+                    break;
+
+                case 'Combinator':
+                    tagName = '*';
+                    break;
+            }
+        });
+
+        simpleSelector.compareMarker = specificity(simpleSelector).toString();
+        simpleSelector.id = null; // pre-init property to avoid multiple hidden class
+        simpleSelector.id = generate(simpleSelector);
+
+        if (scope) {
+            simpleSelector.compareMarker += ':' + scope;
+        }
+
+        if (tagName !== '*') {
+            simpleSelector.compareMarker += ',' + tagName;
+        }
+    });
+
+    // add property to all rule nodes to avoid multiple hidden class
+    node.pseudoSignature = pseudos.size > 0
+        ? [...pseudos].sort().join(',')
+        : false;
+};