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