You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: ace.go
    path of file: ./repos/iris/view
    
    the code of the file until where you have to start completion: package view

import (
	"strings"
	"sync"

	"github.com/yosssi/ace"
)

// AceEngine represents the Ace view engine.
// See the `Ace` package-level function for more.
type AceEngine struct {
	*HTMLEngine

	indent string
}

// SetIndent string used for indentation.
// Do NOT use tabs, only spaces characters.
// Defaults to minified response, no indentation.
func (s *AceEngine) SetIndent(indent string) *AceEngine {
	s.indent = indent
	return s
}

// Ace returns a new Ace view engine.
// It shares the same exactly logic with the
// html view engine, it uses the same exactly configuration.
// The given "extension" MUST begin with a dot.
// Ace minifies the response automatically unless
// SetIndent() method is set.
//
// Read more about the Ace Go Parser: https://github.com/yosssi/ace
//
// Usage:
// Ace("./views", ".ace") or
// Ace(iris.Dir("./views"), ".ace") or
// Ace(embed.FS, ".ace") or Ace(AssetFile(), ".ace") for embedded data.
func Ace(fs interface{}, extension string) *AceEngine {
	s := &AceEngine{HTMLEngine: HTML(fs, extension), indent: ""}
	s.name = "Ace"

	funcs := make(map[string]inte
    
func Ace(fs interface{}, extension string) *AceEngine {
	s := &AceEngine{HTMLEngine: HTML(fs, extension), indent: ""}
	s.name = "Ace"

	funcs := make(map[string]interface{})

	once := new(sync.Once)

	s.middleware = func(name string, text []byte) (contents string, err error) {
		once.Do(func() { // on first template parse, all funcs are given.
			for k, v := range s.getBuiltinFuncs(name) {
				funcs[k] = v
			}

			for k, v := range s.funcs {
				funcs[k] = v
			}
		})

		//	name = path.Join(path.Clean(directory), name)

		src := ace.NewSource(
			ace.NewFile(name, text),
			ace.NewFile("", []byte{}),
			[]*ace.File{},
		)

		if strings.Contains(name, "layout") {
			for k, v := range s.layoutFuncs {
				funcs[k] = v
			}
		}

		opts := &ace.Options{
			Extension:  extension[1:],
			FuncMap:    funcs,
			DelimLeft:  s.left,
			DelimRight: s.right,
			Indent:     s.indent,
		}

		rslt, err := ace.ParseSource(src, opts)
		if err != nil {
			return "", err
		}

		t, err := ace.CompileResult(name, rslt, opts)
		if err != nil {
			return "", err
		}

		return t.Lookup(name).Tree.Root.String(), nil
	}

	return s
}