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node_modules/vant/lib/utils/create/bem.js

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+"use strict";
+
+exports.__esModule = true;
+exports.createBEM = createBEM;
+
+/**
+ * bem helper
+ * b() // 'button'
+ * b('text') // 'button__text'
+ * b({ disabled }) // 'button button--disabled'
+ * b('text', { disabled }) // 'button__text button__text--disabled'
+ * b(['disabled', 'primary']) // 'button button--disabled button--primary'
+ */
+function gen(name, mods) {
+  if (!mods) {
+    return '';
+  }
+
+  if (typeof mods === 'string') {
+    return " " + name + "--" + mods;
+  }
+
+  if (Array.isArray(mods)) {
+    return mods.reduce(function (ret, item) {
+      return ret + gen(name, item);
+    }, '');
+  }
+
+  return Object.keys(mods).reduce(function (ret, key) {
+    return ret + (mods[key] ? gen(name, key) : '');
+  }, '');
+}
+
+function createBEM(name) {
+  return function (el, mods) {
+    if (el && typeof el !== 'string') {
+      mods = el;
+      el = '';
+    }
+
+    el = el ? name + "__" + el : name;
+    return "" + el + gen(el, mods);
+  };
+}