aaac7fed
 liuqimichale
add
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/* @flow */
const Transform = require('stream').Transform
import type TemplateRenderer from './index'
import type { ParsedTemplate } from './parse-template'
export default class TemplateStream extends Transform {
started: boolean;
renderer: TemplateRenderer;
template: ParsedTemplate;
context: Object;
inject: boolean;
constructor (
renderer: TemplateRenderer,
template: ParsedTemplate,
context: Object
) {
super()
this.started = false
this.renderer = renderer
this.template = template
this.context = context || {}
this.inject = renderer.inject
}
_transform (data: Buffer | string, encoding: string, done: Function) {
if (!this.started) {
this.emit('beforeStart')
this.start()
}
this.push(data)
done()
}
start () {
this.started = true
this.push(this.template.head(this.context))
if (this.inject) {
// inline server-rendered head meta information
if (this.context.head) {
this.push(this.context.head)
}
// inline preload/prefetch directives for initial/async chunks
const links = this.renderer.renderResourceHints(this.context)
if (links) {
this.push(links)
}
// CSS files and inline server-rendered CSS collected by vue-style-loader
const styles = this.renderer.renderStyles(this.context)
if (styles) {
this.push(styles)
}
}
this.push(this.template.neck(this.context))
}
_flush (done: Function) {
this.emit('beforeEnd')
if (this.inject) {
// inline initial store state
const state = this.renderer.renderState(this.context)
if (state) {
this.push(state)
}
// embed scripts needed
const scripts = this.renderer.renderScripts(this.context)
if (scripts) {
this.push(scripts)
}
}
this.push(this.template.tail(this.context))
done()
}
}
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