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/* @flow */
import { genHandlers } from './events'
import baseDirectives from '../directives/index'
import { camelize, no, extend } from 'shared/util'
import { baseWarn, pluckModuleFunction } from '../helpers'
import { emptySlotScopeToken } from '../parser/index'
type TransformFunction = (el: ASTElement, code: string) => string;
type DataGenFunction = (el: ASTElement) => string;
type DirectiveFunction = (el: ASTElement, dir: ASTDirective, warn: Function) => boolean;
export class CodegenState {
options: CompilerOptions;
warn: Function;
transforms: Array<TransformFunction>;
dataGenFns: Array<DataGenFunction>;
directives: { [key: string]: DirectiveFunction };
maybeComponent: (el: ASTElement) => boolean;
onceId: number;
staticRenderFns: Array<string>;
pre: boolean;
constructor (options: CompilerOptions) {
this.options = options
this.warn = options.warn || baseWarn
this.transforms = pluckModuleFunction(options.modules, 'transformCode')
this.dataGenFns = pluckModuleFunction(options.modules, 'genData')
this.directives = extend(extend({}, baseDirectives), options.directives)
const isReservedTag = options.isReservedTag || no
this.maybeComponent = (el: ASTElement) => !!el.component || !isReservedTag(el.tag)
this.onceId = 0
this.staticRenderFns = []
this.pre = false
}
}
export type CodegenResult = {
render: string,
staticRenderFns: Array<string>
};
export function generate (
ast: ASTElement | void,
options: CompilerOptions
): CodegenResult {
const state = new CodegenState(options)
// fix #11483, Root level <script> tags should not be rendered.
const code = ast ? (ast.tag === 'script' ? 'null' : genElement(ast, state)) : '_c("div")'
return {
render: `with(this){return ${code}}`,
staticRenderFns: state.staticRenderFns
}
}
export function genElement (el: ASTElement, state: CodegenState): string {
if (el.parent) {
el.pre = el.pre || el.parent.pre
}
if (el.staticRoot && !el.staticProcessed) {
return genStatic(el, state)
} else if (el.once && !el.onceProcessed) {
return genOnce(el, state)
} else if (el.for && !el.forProcessed) {
return genFor(el, state)
} else if (el.if && !el.ifProcessed) {
return genIf(el, state)
} else if (el.tag === 'template' && !el.slotTarget && !state.pre) {
return genChildren(el, state) || 'void 0'
} else if (el.tag === 'slot') {
return genSlot(el, state)
} else {
// component or element
let code
if (el.component) {
code = genComponent(el.component, el, state)
} else {
let data
if (!el.plain || (el.pre && state.maybeComponent(el))) {
data = genData(el, state)
}
const children = el.inlineTemplate ? null : genChildren(el, state, true)
code = `_c('${el.tag}'${
data ? `,${data}` : '' // data
}${
children ? `,${children}` : '' // children
})`
}
// module transforms
for (let i = 0; i < state.transforms.length; i++) {
code = state.transforms[i](el, code)
}
return code
}
}
// hoist static sub-trees out
function genStatic (el: ASTElement, state: CodegenState): string {
el.staticProcessed = true
// Some elements (templates) need to behave differently inside of a v-pre
// node. All pre nodes are static roots, so we can use this as a location to
// wrap a state change and reset it upon exiting the pre node.
const originalPreState = state.pre
if (el.pre) {
state.pre = el.pre
}
state.staticRenderFns.push(`with(this){return ${genElement(el, state)}}`)
state.pre = originalPreState
return `_m(${
state.staticRenderFns.length - 1
}${
el.staticInFor ? ',true' : ''
})`
}
// v-once
function genOnce (el: ASTElement, state: CodegenState): string {
el.onceProcessed = true
if (el.if && !el.ifProcessed) {
return genIf(el, state)
} else if (el.staticInFor) {
let key = ''
let parent = el.parent
while (parent) {
if (parent.for) {
key = parent.key
break
}
parent = parent.parent
}
if (!key) {
process.env.NODE_ENV !== 'production' && state.warn(
`v-once can only be used inside v-for that is keyed. `,
el.rawAttrsMap['v-once']
)
return genElement(el, state)
}
return `_o(${genElement(el, state)},${state.onceId++},${key})`
} else {
return genStatic(el, state)
}
}
export function genIf (
el: any,
state: CodegenState,
altGen?: Function,
altEmpty?: string
): string {
el.ifProcessed = true // avoid recursion
return genIfConditions(el.ifConditions.slice(), state, altGen, altEmpty)
}
function genIfConditions (
conditions: ASTIfConditions,
state: CodegenState,
altGen?: Function,
altEmpty?: string
): string {
if (!conditions.length) {
return altEmpty || '_e()'
}
const condition = conditions.shift()
if (condition.exp) {
return `(${condition.exp})?${
genTernaryExp(condition.block)
}:${
genIfConditions(conditions, state, altGen, altEmpty)
}`
} else {
return `${genTernaryExp(condition.block)}`
}
// v-if with v-once should generate code like (a)?_m(0):_m(1)
function genTernaryExp (el) {
return altGen
? altGen(el, state)
: el.once
? genOnce(el, state)
: genElement(el, state)
}
}
export function genFor (
el: any,
state: CodegenState,
altGen?: Function,
altHelper?: string
): string {
const exp = el.for
const alias = el.alias
const iterator1 = el.iterator1 ? `,${el.iterator1}` : ''
const iterator2 = el.iterator2 ? `,${el.iterator2}` : ''
if (process.env.NODE_ENV !== 'production' &&
state.maybeComponent(el) &&
el.tag !== 'slot' &&
el.tag !== 'template' &&
!el.key
) {
state.warn(
`<${el.tag} v-for="${alias} in ${exp}">: component lists rendered with ` +
`v-for should have explicit keys. ` +
`See https://vuejs.org/guide/list.html#key for more info.`,
el.rawAttrsMap['v-for'],
true /* tip */
)
}
el.forProcessed = true // avoid recursion
return `${altHelper || '_l'}((${exp}),` +
`function(${alias}${iterator1}${iterator2}){` +
`return ${(altGen || genElement)(el, state)}` +
'})'
}
export function genData (el: ASTElement, state: CodegenState): string {
let data = '{'
// directives first.
// directives may mutate the el's other properties before they are generated.
const dirs = genDirectives(el, state)
if (dirs) data += dirs + ','
// key
if (el.key) {
data += `key:${el.key},`
}
// ref
if (el.ref) {
data += `ref:${el.ref},`
}
if (el.refInFor) {
data += `refInFor:true,`
}
// pre
if (el.pre) {
data += `pre:true,`
}
// record original tag name for components using "is" attribute
if (el.component) {
data += `tag:"${el.tag}",`
}
// module data generation functions
for (let i = 0; i < state.dataGenFns.length; i++) {
data += state.dataGenFns[i](el)
}
// attributes
if (el.attrs) {
data += `attrs:${genProps(el.attrs)},`
}
// DOM props
if (el.props) {
data += `domProps:${genProps(el.props)},`
}
// event handlers
if (el.events) {
data += `${genHandlers(el.events, false)},`
}
if (el.nativeEvents) {
data += `${genHandlers(el.nativeEvents, true)},`
}
// slot target
// only for non-scoped slots
if (el.slotTarget && !el.slotScope) {
data += `slot:${el.slotTarget},`
}
// scoped slots
if (el.scopedSlots) {
data += `${genScopedSlots(el, el.scopedSlots, state)},`
}
// component v-model
if (el.model) {
data += `model:{value:${
el.model.value
},callback:${
el.model.callback
},expression:${
el.model.expression
}},`
}
// inline-template
if (el.inlineTemplate) {
const inlineTemplate = genInlineTemplate(el, state)
if (inlineTemplate) {
data += `${inlineTemplate},`
}
}
data = data.replace(/,$/, '') + '}'
// v-bind dynamic argument wrap
// v-bind with dynamic arguments must be applied using the same v-bind object
// merge helper so that class/style/mustUseProp attrs are handled correctly.
if (el.dynamicAttrs) {
data = `_b(${data},"${el.tag}",${genProps(el.dynamicAttrs)})`
}
// v-bind data wrap
if (el.wrapData) {
data = el.wrapData(data)
}
// v-on data wrap
if (el.wrapListeners) {
data = el.wrapListeners(data)
}
return data
}
function genDirectives (el: ASTElement, state: CodegenState): string | void {
const dirs = el.directives
if (!dirs) return
let res = 'directives:['
let hasRuntime = false
let i, l, dir, needRuntime
for (i = 0, l = dirs.length; i < l; i++) {
dir = dirs[i]
needRuntime = true
const gen: DirectiveFunction = state.directives[dir.name]
if (gen) {
// compile-time directive that manipulates AST.
// returns true if it also needs a runtime counterpart.
needRuntime = !!gen(el, dir, state.warn)
}
if (needRuntime) {
hasRuntime = true
res += `{name:"${dir.name}",rawName:"${dir.rawName}"${
dir.value ? `,value:(${dir.value}),expression:${JSON.stringify(dir.value)}` : ''
}${
dir.arg ? `,arg:${dir.isDynamicArg ? dir.arg : `"${dir.arg}"`}` : ''
}${
dir.modifiers ? `,modifiers:${JSON.stringify(dir.modifiers)}` : ''
}},`
}
}
if (hasRuntime) {
return res.slice(0, -1) + ']'
}
}
function genInlineTemplate (el: ASTElement, state: CodegenState): ?string {
const ast = el.children[0]
if (process.env.NODE_ENV !== 'production' && (
el.children.length !== 1 || ast.type !== 1
)) {
state.warn(
'Inline-template components must have exactly one child element.',
{ start: el.start }
)
}
if (ast && ast.type === 1) {
const inlineRenderFns = generate(ast, state.options)
return `inlineTemplate:{render:function(){${
inlineRenderFns.render
}},staticRenderFns:[${
inlineRenderFns.staticRenderFns.map(code => `function(){${code}}`).join(',')
}]}`
}
}
function genScopedSlots (
el: ASTElement,
slots: { [key: string]: ASTElement },
state: CodegenState
): string {
// by default scoped slots are considered "stable", this allows child
// components with only scoped slots to skip forced updates from parent.
// but in some cases we have to bail-out of this optimization
// for example if the slot contains dynamic names, has v-if or v-for on them...
let needsForceUpdate = el.for || Object.keys(slots).some(key => {
const slot = slots[key]
return (
slot.slotTargetDynamic ||
slot.if ||
slot.for ||
containsSlotChild(slot) // is passing down slot from parent which may be dynamic
)
})
// #9534: if a component with scoped slots is inside a conditional branch,
// it's possible for the same component to be reused but with different
// compiled slot content. To avoid that, we generate a unique key based on
// the generated code of all the slot contents.
let needsKey = !!el.if
// OR when it is inside another scoped slot or v-for (the reactivity may be
// disconnected due to the intermediate scope variable)
// #9438, #9506
// TODO: this can be further optimized by properly analyzing in-scope bindings
// and skip force updating ones that do not actually use scope variables.
if (!needsForceUpdate) {
let parent = el.parent
while (parent) {
if (
(parent.slotScope && parent.slotScope !== emptySlotScopeToken) ||
parent.for
) {
needsForceUpdate = true
break
}
if (parent.if) {
needsKey = true
}
parent = parent.parent
}
}
const generatedSlots = Object.keys(slots)
.map(key => genScopedSlot(slots[key], state))
.join(',')
return `scopedSlots:_u([${generatedSlots}]${
needsForceUpdate ? `,null,true` : ``
}${
!needsForceUpdate && needsKey ? `,null,false,${hash(generatedSlots)}` : ``
})`
}
function hash(str) {
let hash = 5381
let i = str.length
while(i) {
hash = (hash * 33) ^ str.charCodeAt(--i)
}
return hash >>> 0
}
function containsSlotChild (el: ASTNode): boolean {
if (el.type === 1) {
if (el.tag === 'slot') {
return true
}
return el.children.some(containsSlotChild)
}
return false
}
function genScopedSlot (
el: ASTElement,
state: CodegenState
): string {
const isLegacySyntax = el.attrsMap['slot-scope']
if (el.if && !el.ifProcessed && !isLegacySyntax) {
return genIf(el, state, genScopedSlot, `null`)
}
if (el.for && !el.forProcessed) {
return genFor(el, state, genScopedSlot)
}
const slotScope = el.slotScope === emptySlotScopeToken
? ``
: String(el.slotScope)
const fn = `function(${slotScope}){` +
`return ${el.tag === 'template'
? el.if && isLegacySyntax
? `(${el.if})?${genChildren(el, state) || 'undefined'}:undefined`
: genChildren(el, state) || 'undefined'
: genElement(el, state)
}}`
// reverse proxy v-slot without scope on this.$slots
const reverseProxy = slotScope ? `` : `,proxy:true`
return `{key:${el.slotTarget || `"default"`},fn:${fn}${reverseProxy}}`
}
export function genChildren (
el: ASTElement,
state: CodegenState,
checkSkip?: boolean,
altGenElement?: Function,
altGenNode?: Function
): string | void {
const children = el.children
if (children.length) {
const el: any = children[0]
// optimize single v-for
if (children.length === 1 &&
el.for &&
el.tag !== 'template' &&
el.tag !== 'slot'
) {
const normalizationType = checkSkip
? state.maybeComponent(el) ? `,1` : `,0`
: ``
return `${(altGenElement || genElement)(el, state)}${normalizationType}`
}
const normalizationType = checkSkip
? getNormalizationType(children, state.maybeComponent)
: 0
const gen = altGenNode || genNode
return `[${children.map(c => gen(c, state)).join(',')}]${
normalizationType ? `,${normalizationType}` : ''
}`
}
}
// determine the normalization needed for the children array.
// 0: no normalization needed
// 1: simple normalization needed (possible 1-level deep nested array)
// 2: full normalization needed
function getNormalizationType (
children: Array<ASTNode>,
maybeComponent: (el: ASTElement) => boolean
): number {
let res = 0
for (let i = 0; i < children.length; i++) {
const el: ASTNode = children[i]
if (el.type !== 1) {
continue
}
if (needsNormalization(el) ||
(el.ifConditions && el.ifConditions.some(c => needsNormalization(c.block)))) {
res = 2
break
}
if (maybeComponent(el) ||
(el.ifConditions && el.ifConditions.some(c => maybeComponent(c.block)))) {
res = 1
}
}
return res
}
function needsNormalization (el: ASTElement): boolean {
return el.for !== undefined || el.tag === 'template' || el.tag === 'slot'
}
function genNode (node: ASTNode, state: CodegenState): string {
if (node.type === 1) {
return genElement(node, state)
} else if (node.type === 3 && node.isComment) {
return genComment(node)
} else {
return genText(node)
}
}
export function genText (text: ASTText | ASTExpression): string {
return `_v(${text.type === 2
? text.expression // no need for () because already wrapped in _s()
: transformSpecialNewlines(JSON.stringify(text.text))
})`
}
export function genComment (comment: ASTText): string {
return `_e(${JSON.stringify(comment.text)})`
}
function genSlot (el: ASTElement, state: CodegenState): string {
const slotName = el.slotName || '"default"'
const children = genChildren(el, state)
let res = `_t(${slotName}${children ? `,function(){return ${children}}` : ''}`
const attrs = el.attrs || el.dynamicAttrs
? genProps((el.attrs || []).concat(el.dynamicAttrs || []).map(attr => ({
// slot props are camelized
name: camelize(attr.name),
value: attr.value,
dynamic: attr.dynamic
})))
: null
const bind = el.attrsMap['v-bind']
if ((attrs || bind) && !children) {
res += `,null`
}
if (attrs) {
res += `,${attrs}`
}
if (bind) {
res += `${attrs ? '' : ',null'},${bind}`
}
return res + ')'
}
// componentName is el.component, take it as argument to shun flow's pessimistic refinement
function genComponent (
componentName: string,
el: ASTElement,
state: CodegenState
): string {
const children = el.inlineTemplate ? null : genChildren(el, state, true)
return `_c(${componentName},${genData(el, state)}${
children ? `,${children}` : ''
})`
}
function genProps (props: Array<ASTAttr>): string {
let staticProps = ``
let dynamicProps = ``
for (let i = 0; i < props.length; i++) {
const prop = props[i]
const value = __WEEX__
? generateValue(prop.value)
: transformSpecialNewlines(prop.value)
if (prop.dynamic) {
dynamicProps += `${prop.name},${value},`
} else {
staticProps += `"${prop.name}":${value},`
}
}
staticProps = `{${staticProps.slice(0, -1)}}`
if (dynamicProps) {
return `_d(${staticProps},[${dynamicProps.slice(0, -1)}])`
} else {
return staticProps
}
}
/* istanbul ignore next */
function generateValue (value) {
if (typeof value === 'string') {
return transformSpecialNewlines(value)
}
return JSON.stringify(value)
}
// #3895, #4268
function transformSpecialNewlines (text: string): string {
return text
.replace(/\u2028/g, '\\u2028')
.replace(/\u2029/g, '\\u2029')
}