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100 lines
2.8 KiB
100 lines
2.8 KiB
/**
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* @fileoverview disallow adding multiple root nodes to the template
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* @author Przemyslaw Falowski (@przemkow)
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*/
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'use strict'
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const utils = require('../utils')
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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 adding multiple root nodes to the template',
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categories: ['vue2-essential'],
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url: 'https://eslint.vuejs.org/rules/no-multiple-template-root.html'
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},
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fixable: null,
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schema: [],
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messages: {
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multipleRoot: 'The template root requires exactly one element.',
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textRoot: 'The template root requires an element rather than texts.',
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disallowedElement: "The template root disallows '<{{name}}>' elements.",
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disallowedDirective: "The template root disallows 'v-for' directives."
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}
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},
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/**
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* @param {RuleContext} context - The rule context.
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* @returns {RuleListener} AST event handlers.
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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 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) {
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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 (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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messageId: 'textRoot'
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})
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} else if (extraElement == null) {
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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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messageId: 'disallowedElement',
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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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messageId: 'disallowedDirective'
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})
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}
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}
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} else {
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context.report({
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node: extraElement,
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loc: extraElement.loc,
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messageId: 'multipleRoot'
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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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