debug.js
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/* @flow */
import config from '../config'
import { noop } from 'shared/util'
export let warn = noop
export let tip = noop
export let generateComponentTrace = (noop: any) // work around flow check
export let formatComponentName = (noop: any)
if (process.env.NODE_ENV !== 'production') {
const hasConsole = typeof console !== 'undefined'
const classifyRE = /(?:^|[-_])(\w)/g
const classify = str => str
.replace(classifyRE, c => c.toUpperCase())
.replace(/[-_]/g, '')
warn = (msg, vm) => {
const trace = vm ? generateComponentTrace(vm) : ''
if (config.warnHandler) {
config.warnHandler.call(null, msg, vm, trace)
} else if (hasConsole && (!config.silent)) {
console.error(`[Vue warn]: ${msg}${trace}`)
}
}
tip = (msg, vm) => {
if (hasConsole && (!config.silent)) {
console.warn(`[Vue tip]: ${msg}` + (
vm ? generateComponentTrace(vm) : ''
))
}
}
formatComponentName = (vm, includeFile) => {
if (vm.$root === vm) {
return '<Root>'
}
const options = typeof vm === 'function' && vm.cid != null
? vm.options
: vm._isVue
? vm.$options || vm.constructor.options
: vm
let name = options.name || options._componentTag
const file = options.__file
if (!name && file) {
const match = file.match(/([^/\\]+)\.vue$/)
name = match && match[1]
}
return (
(name ? `<${classify(name)}>` : `<Anonymous>`) +
(file && includeFile !== false ? ` at ${file}` : '')
)
}
const repeat = (str, n) => {
let res = ''
while (n) {
if (n % 2 === 1) res += str
if (n > 1) str += str
n >>= 1
}
return res
}
generateComponentTrace = vm => {
if (vm._isVue && vm.$parent) {
const tree = []
let currentRecursiveSequence = 0
while (vm) {
if (tree.length > 0) {
const last = tree[tree.length - 1]
if (last.constructor === vm.constructor) {
currentRecursiveSequence++
vm = vm.$parent
continue
} else if (currentRecursiveSequence > 0) {
tree[tree.length - 1] = [last, currentRecursiveSequence]
currentRecursiveSequence = 0
}
}
tree.push(vm)
vm = vm.$parent
}
return '\n\nfound in\n\n' + tree
.map((vm, i) => `${
i === 0 ? '---> ' : repeat(' ', 5 + i * 2)
}${
Array.isArray(vm)
? `${formatComponentName(vm[0])}... (${vm[1]} recursive calls)`
: formatComponentName(vm)
}`)
.join('\n')
} else {
return `\n\n(found in ${formatComponentName(vm)})`
}
}
}