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node_modules/vue/src/server/template-renderer/template-stream.js

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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()
+  }
+}