up n_m

node_modules/postcss-merge-idents/src/index.js

@@ -0,0 +1,146 @@
+'use strict';
+const valueParser = require('postcss-value-parser');
+const { sameParent } = require('cssnano-utils');
+
+/**
+ * @param {Record<string, string>} obj
+ * @return {(key: string) => string}
+ */
+function canonical(obj) {
+  // Prevent potential infinite loops
+  let stack = 50;
+
+  /**
+   * @param {string} key
+   * @return {string}
+   */
+  return function recurse(key) {
+    if (
+      Object.prototype.hasOwnProperty.call(obj, key) &&
+      obj[key] !== key &&
+      stack
+    ) {
+      stack--;
+
+      return recurse(obj[key]);
+    }
+
+    stack = 50;
+
+    return key;
+  };
+}
+
+/**
+ * @param {import('postcss').Root} css
+ * @return {void}
+ */
+function mergeAtRules(css) {
+  const pairs = [
+    {
+      atrule: /keyframes/i,
+      decl: /animation/i,
+      /** @type {import('postcss').AtRule[]} */
+      cache: [],
+      replacements: {},
+      /** @type {import('postcss').Declaration[]} */
+      decls: [],
+      /** @type {import('postcss').AtRule[]} */
+      removals: [],
+    },
+    {
+      atrule: /counter-style/i,
+      decl: /(list-style|system)/i,
+      cache: [],
+      replacements: {},
+      decls: [],
+      removals: [],
+    },
+  ];
+
+  /**
+   * @type {{atrule: RegExp, decl: RegExp, replacements: Record<string, string>, removals: import('postcss').AtRule[], cache: import('postcss').AtRule[], decls: import('postcss').Declaration[]}}
+   */
+  let relevant;
+
+  css.walk((node) => {
+    if (node.type === 'atrule') {
+      relevant = pairs.filter((pair) =>
+        pair.atrule.test(node.name.toLowerCase())
+      )[0];
+
+      if (!relevant) {
+        return;
+      }
+
+      if (relevant.cache.length < 1) {
+        relevant.cache.push(node);
+        return;
+      } else {
+        let toString = node.nodes.toString();
+
+        relevant.cache.forEach((cached) => {
+          if (
+            cached.name.toLowerCase() === node.name.toLowerCase() &&
+            sameParent(
+              /** @type {any} */ (cached),
+              /** @type {any} */ (node)
+            ) &&
+            cached.nodes.toString() === toString
+          ) {
+            relevant.removals.push(cached);
+            relevant.replacements[cached.params] = node.params;
+          }
+        });
+
+        relevant.cache.push(node);
+
+        return;
+      }
+    }
+
+    if (node.type === 'decl') {
+      relevant = pairs.filter((pair) =>
+        pair.decl.test(node.prop.toLowerCase())
+      )[0];
+
+      if (!relevant) {
+        return;
+      }
+
+      relevant.decls.push(node);
+    }
+  });
+
+  pairs.forEach((pair) => {
+    let canon = canonical(pair.replacements);
+
+    pair.decls.forEach((decl) => {
+      decl.value = valueParser(decl.value)
+        .walk((node) => {
+          if (node.type === 'word') {
+            node.value = canon(node.value);
+          }
+        })
+        .toString();
+    });
+    pair.removals.forEach((cached) => cached.remove());
+  });
+}
+
+/**
+ * @type {import('postcss').PluginCreator<void>}
+ * @return {import('postcss').Plugin}
+ */
+function pluginCreator() {
+  return {
+    postcssPlugin: 'postcss-merge-idents',
+
+    OnceExit(css) {
+      mergeAtRules(css);
+    },
+  };
+}
+
+pluginCreator.postcss = true;
+module.exports = pluginCreator;