vue hello world项目
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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')
const keyAliases = require('../utils/key-aliases.json')
// ------------------------------------------------------------------------------
// Helpers
// ------------------------------------------------------------------------------
const VALID_MODIFIERS = new Set([
'stop',
'prevent',
'capture',
'self',
'ctrl',
'shift',
'alt',
'meta',
'native',
'once',
'left',
'right',
'middle',
'passive',
'esc',
'tab',
'enter',
'space',
'up',
'left',
'right',
'down',
'delete',
'exact'
])
const VERB_MODIFIERS = new Set(['stop', 'prevent'])
// https://www.w3.org/TR/uievents-key/
const KEY_ALIASES = new Set(keyAliases)
/**
* @param {VIdentifier} modifierNode
* @param {Set<string>} customModifiers
*/
function isValidModifier(modifierNode, customModifiers) {
const modifier = modifierNode.name
return (
// built-in aliases
VALID_MODIFIERS.has(modifier) ||
// keyCode
Number.isInteger(parseInt(modifier, 10)) ||
// keyAlias (an Unicode character)
Array.from(modifier).length === 1 ||
// keyAlias (special keys)
KEY_ALIASES.has(modifier) ||
// custom modifiers
customModifiers.has(modifier)
)
}
// ------------------------------------------------------------------------------
// Rule Definition
// ------------------------------------------------------------------------------
module.exports = {
meta: {
type: 'problem',
docs: {
description: 'enforce valid `v-on` directives',
categories: ['vue3-essential', 'essential'],
url: 'https://eslint.vuejs.org/rules/valid-v-on.html'
},
fixable: null,
schema: [
{
type: 'object',
properties: {
modifiers: {
type: 'array'
}
},
additionalProperties: false
}
],
messages: {
unsupportedModifier:
"'v-on' directives don't support the modifier '{{modifier}}'.",
avoidKeyword:
'Avoid using JavaScript keyword as "v-on" value: {{value}}.',
expectedValueOrVerb:
"'v-on' directives require a value or verb modifier (like 'stop' or 'prevent')."
}
},
/** @param {RuleContext} context */
create(context) {
const options = context.options[0] || {}
/** @type {Set<string>} */
const customModifiers = new Set(options.modifiers || [])
const sourceCode = context.getSourceCode()
return utils.defineTemplateBodyVisitor(context, {
/** @param {VDirective} node */
"VAttribute[directive=true][key.name.name='on']"(node) {
for (const modifier of node.key.modifiers) {
if (!isValidModifier(modifier, customModifiers)) {
context.report({
node: modifier,
messageId: 'unsupportedModifier',
data: { modifier: modifier.name }
})
}
}
if (
(!node.value || !node.value.expression) &&
!node.key.modifiers.some((modifier) =>
VERB_MODIFIERS.has(modifier.name)
)
) {
if (node.value && !utils.isEmptyValueDirective(node, context)) {
const valueText = sourceCode.getText(node.value)
let innerText = valueText
if (
(valueText[0] === '"' || valueText[0] === "'") &&
valueText[0] === valueText[valueText.length - 1]
) {
// quoted
innerText = valueText.slice(1, -1)
}
if (/^\w+$/.test(innerText)) {
context.report({
node: node.value,
messageId: 'avoidKeyword',
data: { value: valueText }
})
}
} else {
context.report({
node,
messageId: 'expectedValueOrVerb'
})
}
}
}
})
}
}