112 lines
3.5 KiB
JavaScript
112 lines
3.5 KiB
JavaScript
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/**
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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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// Rule Definition
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// ------------------------------------------------------------------------------
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module.exports = {
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meta: {
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docs: {
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description: 'enforce valid template root',
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category: 'essential',
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url: 'https://github.com/vuejs/eslint-plugin-vue/blob/v4.7.1/docs/rules/valid-template-root.md'
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},
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fixable: null,
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schema: []
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},
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create (context) {
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const sourceCode = context.getSourceCode()
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return {
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Program (program) {
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const element = program.templateBody
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if (element == null) {
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return
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}
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const hasSrc = utils.hasAttribute(element, 'src')
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const rootElements = []
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let extraText = null
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let extraElement = null
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let vIf = false
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for (const child of element.children) {
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if (child.type === 'VElement') {
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if (rootElements.length === 0 && !hasSrc) {
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rootElements.push(child)
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vIf = utils.hasDirective(child, 'if')
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} else if (vIf && utils.hasDirective(child, 'else-if')) {
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rootElements.push(child)
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} else if (vIf && utils.hasDirective(child, 'else')) {
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rootElements.push(child)
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vIf = false
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} else {
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extraElement = child
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}
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} else if (sourceCode.getText(child).trim() !== '') {
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extraText = child
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}
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}
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if (hasSrc && (extraText != null || extraElement != null)) {
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context.report({
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node: extraText || extraElement,
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loc: (extraText || extraElement).loc,
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message: "The template root with 'src' attribute is required to be empty."
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})
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} else if (extraText != null) {
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context.report({
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node: extraText,
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loc: extraText.loc,
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message: 'The template root requires an element rather than texts.'
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})
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} else if (extraElement != null) {
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context.report({
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node: extraElement,
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loc: extraElement.loc,
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message: 'The template root requires exactly one element.'
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})
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} else if (rootElements.length === 0 && !hasSrc) {
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context.report({
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node: element,
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loc: element.loc,
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message: 'The template root requires exactly one element.'
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})
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} else {
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for (const element of rootElements) {
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const tag = element.startTag
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const name = element.name
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if (name === 'template' || name === 'slot') {
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context.report({
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node: tag,
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loc: tag.loc,
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message: "The template root disallows '<{{name}}>' elements.",
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data: { name }
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})
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}
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if (utils.hasDirective(element, 'for')) {
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context.report({
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node: tag,
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loc: tag.loc,
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message: "The template root disallows 'v-for' directives."
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})
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}
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}
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}
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}
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}
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}
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}
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