forked from vuejs/eslint-plugin-vue
/
no-extra-parens.js
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/
no-extra-parens.js
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/**
* @author Yosuke Ota
*/
'use strict'
const { isParenthesized } = require('eslint-utils')
const { wrapCoreRule } = require('../utils')
// eslint-disable-next-line no-invalid-meta, no-invalid-meta-docs-categories
module.exports = wrapCoreRule('no-extra-parens', {
skipDynamicArguments: true,
create: createForVueSyntax
})
/**
* Check whether the given token is a left parenthesis.
* @param {Token} token The token to check.
* @returns {boolean} `true` if the token is a left parenthesis.
*/
function isLeftParen(token) {
return token.type === 'Punctuator' && token.value === '('
}
/**
* Check whether the given token is a right parenthesis.
* @param {Token} token The token to check.
* @returns {boolean} `true` if the token is a right parenthesis.
*/
function isRightParen(token) {
return token.type === 'Punctuator' && token.value === ')'
}
/**
* Check whether the given token is a left brace.
* @param {Token} token The token to check.
* @returns {boolean} `true` if the token is a left brace.
*/
function isLeftBrace(token) {
return token.type === 'Punctuator' && token.value === '{'
}
/**
* Check whether the given token is a right brace.
* @param {Token} token The token to check.
* @returns {boolean} `true` if the token is a right brace.
*/
function isRightBrace(token) {
return token.type === 'Punctuator' && token.value === '}'
}
/**
* Check whether the given token is a left bracket.
* @param {Token} token The token to check.
* @returns {boolean} `true` if the token is a left bracket.
*/
function isLeftBracket(token) {
return token.type === 'Punctuator' && token.value === '['
}
/**
* Check whether the given token is a right bracket.
* @param {Token} token The token to check.
* @returns {boolean} `true` if the token is a right bracket.
*/
function isRightBracket(token) {
return token.type === 'Punctuator' && token.value === ']'
}
/**
* Determines if a given expression node is an IIFE
* @param {Expression} node The node to check
* @returns {node is CallExpression & { callee: FunctionExpression } } `true` if the given node is an IIFE
*/
function isIIFE(node) {
return (
node.type === 'CallExpression' && node.callee.type === 'FunctionExpression'
)
}
/**
* @param {RuleContext} context - The rule context.
* @returns {TemplateListener} AST event handlers.
*/
function createForVueSyntax(context) {
if (!context.parserServices.getTemplateBodyTokenStore) {
return {}
}
const tokenStore = context.parserServices.getTemplateBodyTokenStore()
/**
* Checks if the given node turns into a filter when unwraped.
* @param {Expression} expression node to evaluate
* @returns {boolean} `true` if the given node turns into a filter when unwraped.
*/
function isUnwrapChangeToFilter(expression) {
let parenStack = null
for (const token of tokenStore.getTokens(expression)) {
if (!parenStack) {
if (token.value === '|') {
return true
}
} else {
if (parenStack.isUpToken(token)) {
parenStack = parenStack.upper
continue
}
}
if (isLeftParen(token)) {
parenStack = { isUpToken: isRightParen, upper: parenStack }
} else if (isLeftBracket(token)) {
parenStack = { isUpToken: isRightBracket, upper: parenStack }
} else if (isLeftBrace(token)) {
parenStack = { isUpToken: isRightBrace, upper: parenStack }
}
}
return false
}
/**
* @param {VExpressionContainer & { expression: Expression | VFilterSequenceExpression | null }} node
*/
function verify(node) {
if (!node.expression) {
return
}
const expression =
node.expression.type === 'VFilterSequenceExpression'
? node.expression.expression
: node.expression
if (!isParenthesized(expression, tokenStore)) {
return
}
if (!isParenthesized(2, expression, tokenStore)) {
if (
isIIFE(expression) &&
!isParenthesized(expression.callee, tokenStore)
) {
return
}
if (isUnwrapChangeToFilter(expression)) {
return
}
}
report(expression)
}
/**
* Report the node
* @param {Expression} node node to evaluate
* @returns {void}
* @private
*/
function report(node) {
const sourceCode = context.getSourceCode()
const leftParenToken = tokenStore.getTokenBefore(node)
const rightParenToken = tokenStore.getTokenAfter(node)
context.report({
node,
loc: leftParenToken.loc,
messageId: 'unexpected',
fix(fixer) {
const parenthesizedSource = sourceCode.text.slice(
leftParenToken.range[1],
rightParenToken.range[0]
)
return fixer.replaceTextRange(
[leftParenToken.range[0], rightParenToken.range[1]],
parenthesizedSource
)
}
})
}
return {
"VAttribute[directive=true][key.name.name='bind'] > VExpressionContainer":
verify,
'VElement > VExpressionContainer': verify
}
}