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app_vue/node_modules/eslint-plugin-vue/lib/rules/no-duplicate-attributes.js

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+/**
+ * @author Toru Nagashima
+ * @copyright 2017 Toru Nagashima. All rights reserved.
+ * See LICENSE file in root directory for full license.
+ */
+'use strict'
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+const utils = require('../utils')
+
+// ------------------------------------------------------------------------------
+// Helpers
+// ------------------------------------------------------------------------------
+
+/**
+ * Get the name of the given attribute node.
+ * @param {VAttribute | VDirective} attribute The attribute node to get.
+ * @returns {string | null} The name of the attribute.
+ */
+function getName(attribute) {
+  if (!attribute.directive) {
+    return attribute.key.name
+  }
+  if (attribute.key.name.name === 'bind') {
+    return (
+      (attribute.key.argument &&
+        attribute.key.argument.type === 'VIdentifier' &&
+        attribute.key.argument.name) ||
+      null
+    )
+  }
+  return null
+}
+
+// ------------------------------------------------------------------------------
+// Rule Definition
+// ------------------------------------------------------------------------------
+
+module.exports = {
+  meta: {
+    type: 'problem',
+    docs: {
+      description: 'disallow duplication of attributes',
+      categories: ['vue3-essential', 'essential'],
+      url: 'https://eslint.vuejs.org/rules/no-duplicate-attributes.html'
+    },
+    fixable: null,
+
+    schema: [
+      {
+        type: 'object',
+        properties: {
+          allowCoexistClass: {
+            type: 'boolean'
+          },
+          allowCoexistStyle: {
+            type: 'boolean'
+          }
+        },
+        additionalProperties: false
+      }
+    ]
+  },
+  /** @param {RuleContext} context */
+  create(context) {
+    const options = context.options[0] || {}
+    const allowCoexistStyle = options.allowCoexistStyle !== false
+    const allowCoexistClass = options.allowCoexistClass !== false
+
+    /** @type {Set<string>} */
+    const directiveNames = new Set()
+    /** @type {Set<string>} */
+    const attributeNames = new Set()
+
+    /**
+     * @param {string} name
+     * @param {boolean} isDirective
+     */
+    function isDuplicate(name, isDirective) {
+      if (
+        (allowCoexistStyle && name === 'style') ||
+        (allowCoexistClass && name === 'class')
+      ) {
+        return isDirective ? directiveNames.has(name) : attributeNames.has(name)
+      }
+      return directiveNames.has(name) || attributeNames.has(name)
+    }
+
+    return utils.defineTemplateBodyVisitor(context, {
+      VStartTag() {
+        directiveNames.clear()
+        attributeNames.clear()
+      },
+      VAttribute(node) {
+        const name = getName(node)
+        if (name == null) {
+          return
+        }
+
+        if (isDuplicate(name, node.directive)) {
+          context.report({
+            node,
+            loc: node.loc,
+            message: "Duplicate attribute '{{name}}'.",
+            data: { name }
+          })
+        }
+
+        if (node.directive) {
+          directiveNames.add(name)
+        } else {
+          attributeNames.add(name)
+        }
+      }
+    })
+  }
+}