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index.js
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/* @flow */
import he from 'he'
import { parseHTML } from './html-parser'
import { parseText } from './text-parser'
import { parseFilters } from './filter-parser'
import { genAssignmentCode } from '../directives/model'
import { extend, cached, no, camelize } from 'shared/util'
import { isIE, isEdge, isServerRendering } from 'core/util/env'
import {
addProp,
addAttr,
baseWarn,
addHandler,
addDirective,
getBindingAttr,
getAndRemoveAttr,
pluckModuleFunction
} from '../helpers'
export const onRE = /^@|^v-on:/
export const dirRE = /^v-|^@|^:/
export const forAliasRE = /([\s\S]*?)\s+(?:in|of)\s+([\s\S]*)/
export const forIteratorRE = /,([^,\}\]]*)(?:,([^,\}\]]*))?$/
const stripParensRE = /^\(|\)$/g
const argRE = /:(.*)$/
export const bindRE = /^:|^v-bind:/
const modifierRE = /\.[^.]+/g
const decodeHTMLCached = cached(he.decode)
// configurable state
export let warn: any
let delimiters
let transforms
let preTransforms
let postTransforms
let platformIsPreTag
let platformMustUseProp
let platformGetTagNamespace
type Attr = { name: string; value: string };
export function createASTElement (
tag: string,
attrs: Array<Attr>,
parent: ASTElement | void
): ASTElement {
return {
type: 1,
tag,
attrsList: attrs,
attrsMap: makeAttrsMap(attrs),
parent,
children: []
}
}
/**
* Convert HTML string to AST.
*/
export function parse (
template: string,
options: CompilerOptions
): ASTElement | void {
warn = options.warn || baseWarn
platformIsPreTag = options.isPreTag || no
platformMustUseProp = options.mustUseProp || no
platformGetTagNamespace = options.getTagNamespace || no
transforms = pluckModuleFunction(options.modules, 'transformNode')
preTransforms = pluckModuleFunction(options.modules, 'preTransformNode')
postTransforms = pluckModuleFunction(options.modules, 'postTransformNode')
delimiters = options.delimiters
const stack = []
const preserveWhitespace = options.preserveWhitespace !== false
let root
let currentParent
let inVPre = false
let inPre = false
let warned = false
function warnOnce (msg) {
if (!warned) {
warned = true
warn(msg)
}
}
function closeElement (element) {
// check pre state
if (element.pre) {
inVPre = false
}
if (platformIsPreTag(element.tag)) {
inPre = false
}
// apply post-transforms
for (let i = 0; i < postTransforms.length; i++) {
postTransforms[i](element, options)
}
}
parseHTML(template, {
warn,
expectHTML: options.expectHTML,
isUnaryTag: options.isUnaryTag,
canBeLeftOpenTag: options.canBeLeftOpenTag,
shouldDecodeNewlines: options.shouldDecodeNewlines,
shouldDecodeNewlinesForHref: options.shouldDecodeNewlinesForHref,
shouldKeepComment: options.comments,
start (tag, attrs, unary) {
// check namespace.
// inherit parent ns if there is one
const ns = (currentParent && currentParent.ns) || platformGetTagNamespace(tag)
// handle IE svg bug
/* istanbul ignore if */
if (isIE && ns === 'svg') {
attrs = guardIESVGBug(attrs)
}
let element: ASTElement = createASTElement(tag, attrs, currentParent)
if (ns) {
element.ns = ns
}
if (isForbiddenTag(element) && !isServerRendering()) {
element.forbidden = true
process.env.NODE_ENV !== 'production' && warn(
'Templates should only be responsible for mapping the state to the ' +
'UI. Avoid placing tags with side-effects in your templates, such as ' +
`<${tag}>` + ', as they will not be parsed.'
)
}
// apply pre-transforms
for (let i = 0; i < preTransforms.length; i++) {
element = preTransforms[i](element, options) || element
}
if (!inVPre) {
processPre(element)
if (element.pre) {
inVPre = true
}
}
if (platformIsPreTag(element.tag)) {
inPre = true
}
if (inVPre) {
processRawAttrs(element)
} else if (!element.processed) {
// structural directives
processFor(element)
processIf(element)
processOnce(element)
// element-scope stuff
processElement(element, options)
}
function checkRootConstraints (el) {
if (process.env.NODE_ENV !== 'production') {
if (el.tag === 'slot' || el.tag === 'template') {
warnOnce(
`Cannot use <${el.tag}> as component root element because it may ` +
'contain multiple nodes.'
)
}
if (el.attrsMap.hasOwnProperty('v-for')) {
warnOnce(
'Cannot use v-for on stateful component root element because ' +
'it renders multiple elements.'
)
}
}
}
// tree management
if (!root) {
root = element
checkRootConstraints(root)
} else if (!stack.length) {
// allow root elements with v-if, v-else-if and v-else
if (root.if && (element.elseif || element.else)) {
checkRootConstraints(element)
addIfCondition(root, {
exp: element.elseif,
block: element
})
} else if (process.env.NODE_ENV !== 'production') {
warnOnce(
`Component template should contain exactly one root element. ` +
`If you are using v-if on multiple elements, ` +
`use v-else-if to chain them instead.`
)
}
}
if (currentParent && !element.forbidden) {
if (element.elseif || element.else) {
processIfConditions(element, currentParent)
} else if (element.slotScope) { // scoped slot
currentParent.plain = false
const name = element.slotTarget || '"default"'
;(currentParent.scopedSlots || (currentParent.scopedSlots = {}))[name] = element
} else {
currentParent.children.push(element)
element.parent = currentParent
}
}
if (!unary) {
currentParent = element
stack.push(element)
} else {
closeElement(element)
}
},
end () {
// remove trailing whitespace
const element = stack[stack.length - 1]
const lastNode = element.children[element.children.length - 1]
if (lastNode && lastNode.type === 3 && lastNode.text === ' ' && !inPre) {
element.children.pop()
}
// pop stack
stack.length -= 1
currentParent = stack[stack.length - 1]
closeElement(element)
},
chars (text: string) {
if (!currentParent) {
if (process.env.NODE_ENV !== 'production') {
if (text === template) {
warnOnce(
'Component template requires a root element, rather than just text.'
)
} else if ((text = text.trim())) {
warnOnce(
`text "${text}" outside root element will be ignored.`
)
}
}
return
}
// IE textarea placeholder bug
/* istanbul ignore if */
if (isIE &&
currentParent.tag === 'textarea' &&
currentParent.attrsMap.placeholder === text
) {
return
}
const children = currentParent.children
text = inPre || text.trim()
? isTextTag(currentParent) ? text : decodeHTMLCached(text)
// only preserve whitespace if its not right after a starting tag
: preserveWhitespace && children.length ? ' ' : ''
if (text) {
let res
if (!inVPre && text !== ' ' && (res = parseText(text, delimiters))) {
children.push({
type: 2,
expression: res.expression,
tokens: res.tokens,
text
})
} else if (text !== ' ' || !children.length || children[children.length - 1].text !== ' ') {
children.push({
type: 3,
text
})
}
}
},
comment (text: string) {
currentParent.children.push({
type: 3,
text,
isComment: true
})
}
})
return root
}
function processPre (el) {
if (getAndRemoveAttr(el, 'v-pre') != null) {
el.pre = true
}
}
function processRawAttrs (el) {
const l = el.attrsList.length
if (l) {
const attrs = el.attrs = new Array(l)
for (let i = 0; i < l; i++) {
attrs[i] = {
name: el.attrsList[i].name,
value: JSON.stringify(el.attrsList[i].value)
}
}
} else if (!el.pre) {
// non root node in pre blocks with no attributes
el.plain = true
}
}
export function processElement (element: ASTElement, options: CompilerOptions) {
processKey(element)
// determine whether this is a plain element after
// removing structural attributes
element.plain = !element.key && !element.attrsList.length
processRef(element)
processSlot(element)
processComponent(element)
for (let i = 0; i < transforms.length; i++) {
element = transforms[i](element, options) || element
}
processAttrs(element)
}
function processKey (el) {
const exp = getBindingAttr(el, 'key')
if (exp) {
if (process.env.NODE_ENV !== 'production') {
if (el.tag === 'template') {
warn(`<template> cannot be keyed. Place the key on real elements instead.`)
}
if (el.for) {
const iterator = el.iterator2 || el.iterator1
const parent = el.parent
if (iterator && iterator === exp && parent && parent.tag === 'transition-group') {
warn(
`Do not use v-for index as key on <transtion-group> children, ` +
`this is the same as not using keys.`
)
}
}
}
el.key = exp
}
}
function processRef (el) {
const ref = getBindingAttr(el, 'ref')
if (ref) {
el.ref = ref
el.refInFor = checkInFor(el)
}
}
export function processFor (el: ASTElement) {
let exp
if ((exp = getAndRemoveAttr(el, 'v-for'))) {
const res = parseFor(exp)
if (res) {
extend(el, res)
} else if (process.env.NODE_ENV !== 'production') {
warn(
`Invalid v-for expression: ${exp}`
)
}
}
}
type ForParseResult = {
for: string;
alias: string;
iterator1?: string;
iterator2?: string;
};
export function parseFor (exp: string): ?ForParseResult {
const inMatch = exp.match(forAliasRE)
if (!inMatch) return
const res = {}
res.for = inMatch[2].trim()
const alias = inMatch[1].trim().replace(stripParensRE, '')
const iteratorMatch = alias.match(forIteratorRE)
if (iteratorMatch) {
res.alias = alias.replace(forIteratorRE, '').trim()
res.iterator1 = iteratorMatch[1].trim()
if (iteratorMatch[2]) {
res.iterator2 = iteratorMatch[2].trim()
}
} else {
res.alias = alias
}
return res
}
function processIf (el) {
const exp = getAndRemoveAttr(el, 'v-if')
if (exp) {
el.if = exp
addIfCondition(el, {
exp: exp,
block: el
})
} else {
if (getAndRemoveAttr(el, 'v-else') != null) {
el.else = true
}
const elseif = getAndRemoveAttr(el, 'v-else-if')
if (elseif) {
el.elseif = elseif
}
}
}
function processIfConditions (el, parent) {
const prev = findPrevElement(parent.children)
if (prev && prev.if) {
addIfCondition(prev, {
exp: el.elseif,
block: el
})
} else if (process.env.NODE_ENV !== 'production') {
warn(
`v-${el.elseif ? ('else-if="' + el.elseif + '"') : 'else'} ` +
`used on element <${el.tag}> without corresponding v-if.`
)
}
}
function findPrevElement (children: Array<any>): ASTElement | void {
let i = children.length
while (i--) {
if (children[i].type === 1) {
return children[i]
} else {
if (process.env.NODE_ENV !== 'production' && children[i].text !== ' ') {
warn(
`text "${children[i].text.trim()}" between v-if and v-else(-if) ` +
`will be ignored.`
)
}
children.pop()
}
}
}
export function addIfCondition (el: ASTElement, condition: ASTIfCondition) {
if (!el.ifConditions) {
el.ifConditions = []
}
el.ifConditions.push(condition)
}
function processOnce (el) {
const once = getAndRemoveAttr(el, 'v-once')
if (once != null) {
el.once = true
}
}
function processSlot (el) {
if (el.tag === 'slot') {
el.slotName = getBindingAttr(el, 'name')
if (process.env.NODE_ENV !== 'production' && el.key) {
warn(
`\`key\` does not work on <slot> because slots are abstract outlets ` +
`and can possibly expand into multiple elements. ` +
`Use the key on a wrapping element instead.`
)
}
} else {
let slotScope
if (el.tag === 'template') {
slotScope = getAndRemoveAttr(el, 'scope')
/* istanbul ignore if */
if (process.env.NODE_ENV !== 'production' && slotScope) {
warn(
`the "scope" attribute for scoped slots have been deprecated and ` +
`replaced by "slot-scope" since 2.5. The new "slot-scope" attribute ` +
`can also be used on plain elements in addition to <template> to ` +
`denote scoped slots.`,
true
)
}
el.slotScope = slotScope || getAndRemoveAttr(el, 'slot-scope')
} else if ((slotScope = getAndRemoveAttr(el, 'slot-scope'))) {
/* istanbul ignore if */
if (process.env.NODE_ENV !== 'production' && el.attrsMap['v-for']) {
warn(
`Ambiguous combined usage of slot-scope and v-for on <${el.tag}> ` +
`(v-for takes higher priority). Use a wrapper <template> for the ` +
`scoped slot to make it clearer.`,
true
)
}
el.slotScope = slotScope
}
const slotTarget = getBindingAttr(el, 'slot')
if (slotTarget) {
el.slotTarget = slotTarget === '""' ? '"default"' : slotTarget
// preserve slot as an attribute for native shadow DOM compat
// only for non-scoped slots.
if (el.tag !== 'template' && !el.slotScope) {
addAttr(el, 'slot', slotTarget)
}
}
}
}
function processComponent (el) {
let binding
if ((binding = getBindingAttr(el, 'is'))) {
el.component = binding
}
if (getAndRemoveAttr(el, 'inline-template') != null) {
el.inlineTemplate = true
}
}
function processAttrs (el) {
const list = el.attrsList
let i, l, name, rawName, value, modifiers, isProp
for (i = 0, l = list.length; i < l; i++) {
name = rawName = list[i].name
value = list[i].value
if (dirRE.test(name)) {
// mark element as dynamic
el.hasBindings = true
// modifiers
modifiers = parseModifiers(name)
if (modifiers) {
name = name.replace(modifierRE, '')
}
if (bindRE.test(name)) { // v-bind
name = name.replace(bindRE, '')
value = parseFilters(value)
isProp = false
if (
process.env.NODE_ENV !== 'production' &&
value.trim().length === 0
) {
warn(
`The value for a v-bind expression cannot be empty. Found in "v-bind:${name}"`
)
}
if (modifiers) {
if (modifiers.prop) {
isProp = true
name = camelize(name)
if (name === 'innerHtml') name = 'innerHTML'
}
if (modifiers.camel) {
name = camelize(name)
}
if (modifiers.sync) {
addHandler(
el,
`update:${camelize(name)}`,
genAssignmentCode(value, `$event`)
)
}
}
if (isProp || (
!el.component && platformMustUseProp(el.tag, el.attrsMap.type, name)
)) {
addProp(el, name, value)
} else {
addAttr(el, name, value)
}
} else if (onRE.test(name)) { // v-on
name = name.replace(onRE, '')
addHandler(el, name, value, modifiers, false, warn)
} else { // normal directives
name = name.replace(dirRE, '')
// parse arg
const argMatch = name.match(argRE)
const arg = argMatch && argMatch[1]
if (arg) {
name = name.slice(0, -(arg.length + 1))
}
addDirective(el, name, rawName, value, arg, modifiers)
if (process.env.NODE_ENV !== 'production' && name === 'model') {
checkForAliasModel(el, value)
}
}
} else {
// literal attribute
if (process.env.NODE_ENV !== 'production') {
const res = parseText(value, delimiters)
if (res) {
warn(
`${name}="${value}": ` +
'Interpolation inside attributes has been removed. ' +
'Use v-bind or the colon shorthand instead. For example, ' +
'instead of <div id="{{ val }}">, use <div :id="val">.'
)
}
}
addAttr(el, name, JSON.stringify(value))
// #6887 firefox doesn't update muted state if set via attribute
// even immediately after element creation
if (!el.component &&
name === 'muted' &&
platformMustUseProp(el.tag, el.attrsMap.type, name)) {
addProp(el, name, 'true')
}
}
}
}
function checkInFor (el: ASTElement): boolean {
let parent = el
while (parent) {
if (parent.for !== undefined) {
return true
}
parent = parent.parent
}
return false
}
function parseModifiers (name: string): Object | void {
const match = name.match(modifierRE)
if (match) {
const ret = {}
match.forEach(m => { ret[m.slice(1)] = true })
return ret
}
}
function makeAttrsMap (attrs: Array<Object>): Object {
const map = {}
for (let i = 0, l = attrs.length; i < l; i++) {
if (
process.env.NODE_ENV !== 'production' &&
map[attrs[i].name] && !isIE && !isEdge
) {
warn('duplicate attribute: ' + attrs[i].name)
}
map[attrs[i].name] = attrs[i].value
}
return map
}
// for script (e.g. type="x/template") or style, do not decode content
function isTextTag (el): boolean {
return el.tag === 'script' || el.tag === 'style'
}
function isForbiddenTag (el): boolean {
return (
el.tag === 'style' ||
(el.tag === 'script' && (
!el.attrsMap.type ||
el.attrsMap.type === 'text/javascript'
))
)
}
const ieNSBug = /^xmlns:NS\d+/
const ieNSPrefix = /^NS\d+:/
/* istanbul ignore next */
function guardIESVGBug (attrs) {
const res = []
for (let i = 0; i < attrs.length; i++) {
const attr = attrs[i]
if (!ieNSBug.test(attr.name)) {
attr.name = attr.name.replace(ieNSPrefix, '')
res.push(attr)
}
}
return res
}
function checkForAliasModel (el, value) {
let _el = el
while (_el) {
if (_el.for && _el.alias === value) {
warn(
`<${el.tag} v-model="${value}">: ` +
`You are binding v-model directly to a v-for iteration alias. ` +
`This will not be able to modify the v-for source array because ` +
`writing to the alias is like modifying a function local variable. ` +
`Consider using an array of objects and use v-model on an object property instead.`
)
}
_el = _el.parent
}
}