vue hello world项目
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3 years ago
'use strict'
/**
* Check whether the given token is a wildcard.
* @param {Token|undefined|null} token The token to check.
* @returns {boolean} `true` if the token is a wildcard.
*/
function isWildcard(token) {
return token != null && token.type === 'Punctuator' && token.value === '*'
}
/**
* Check whether the given token is a question.
* @param {Token|undefined|null} token The token to check.
* @returns {boolean} `true` if the token is a question.
*/
function isQuestion(token) {
return token != null && token.type === 'Punctuator' && token.value === '?'
}
/**
* Check whether the given token is an extends keyword.
* @param {Token|undefined|null} token The token to check.
* @returns {boolean} `true` if the token is an extends keywordn.
*/
function isExtendsKeyword(token) {
return token != null && token.type === 'Keyword' && token.value === 'extends'
}
/**
* Check whether the given token is a whitespace.
* @param {Token|undefined|null} token The token to check.
* @returns {boolean} `true` if the token is a whitespace.
*/
function isNotWhitespace(token) {
return (
token != null &&
token.type !== 'HTMLWhitespace' &&
(token.type !== 'JSXText' || !!token.value.trim())
)
}
/**
* Check whether the given token is a comment.
* @param {Token|undefined|null} token The token to check.
* @returns {boolean} `true` if the token is a comment.
*/
function isComment(token) {
return (
token != null &&
(token.type === 'Block' ||
token.type === 'Line' ||
token.type === 'Shebang' ||
(typeof token.type ===
'string' /* Although acorn supports new tokens, espree may not yet support new tokens.*/ &&
token.type.endsWith('Comment')))
)
}
/**
* Check whether the given token is a comment.
* @param {Token|undefined|null} token The token to check.
* @returns {boolean} `false` if the token is a comment.
*/
function isNotComment(token) {
return (
token != null &&
token.type !== 'Block' &&
token.type !== 'Line' &&
token.type !== 'Shebang' &&
!(
typeof token.type ===
'string' /* Although acorn supports new tokens, espree may not yet support new tokens.*/ &&
token.type.endsWith('Comment')
)
)
}
/**
* Check whether the given node is not an empty text node.
* @param {ASTNode} node The node to check.
* @returns {boolean} `false` if the token is empty text node.
*/
function isNotEmptyTextNode(node) {
return !(node.type === 'VText' && node.value.trim() === '')
}
/**
* Check whether the given token is a pipe operator.
* @param {Token|undefined|null} token The token to check.
* @returns {boolean} `true` if the token is a pipe operator.
*/
function isPipeOperator(token) {
return token != null && token.type === 'Punctuator' && token.value === '|'
}
/**
* Get the last element.
* @template T
* @param {T[]} xs The array to get the last element.
* @returns {T | undefined} The last element or undefined.
*/
function last(xs) {
return xs.length === 0 ? undefined : xs[xs.length - 1]
}
module.exports = {
isWildcard,
isQuestion,
isExtendsKeyword,
isNotWhitespace,
isComment,
isNotComment,
isNotEmptyTextNode,
isPipeOperator,
last
}