generate(
  ast,
  extend({}, options, {
    prefixIdentifiers
  })
)

export function generate(ast, options = {}) {
  // 创建代码生成上下文
  const context = createCodegenContext(ast, options)
  const {
    mode,
    push,
    prefixIdentifiers,
    indent,
    deindent,
    newline,
    scopeId,
    ssr
  } = context

  const hasHelpers = ast.helpers.length > 0
  const useWithBlock = !prefixIdentifiers && mode !== 'module'
  const genScopeId = !__BROWSER__ && scopeId != null && mode === 'module'
  const isSetupInlined = !__BROWSER__ && !!options.inline

  // 生成预设代码
  const preambleContext = isSetupInlined
    ? createCodegenContext(ast, options)
    : context
  // 不在浏览器的环境且 mode 是 module
  if (!__BROWSER__ && mode === 'module') {
    genModulePreamble(ast, preambleContext, genScopeId, isSetupInlined)
  } else {
    genFunctionPreamble(ast, preambleContext)
  }
  // 进入 render 函数构造
  const functionName = `render`
  const args = ['_ctx', '_cache']

  const signature = args.join(', ')

  push(`function ${functionName}(${signature}) {`)

  indent()

  if (useWithBlock) {
    // 处理带 with 的情况，Web 端运行时编译
    push(`with (_ctx) {`)
    indent()
    if (hasHelpers) {
      push(`const { ${ast.helpers.map(aliasHelper).join(', ')} } = _Vue`)
      push(`\n`)
      newline()
    }
  }

  // 生成自定义组件声明代码
  if (ast.components.length) {
    genAssets(ast.components, 'component', context)
    if (ast.directives.length || ast.temps > 0) {
      newline()
    }
  }
  // 生成自定义指令声明代码