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template_go.go
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template_go.go
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package znet
import (
"fmt"
"html/template"
"io"
"os"
"path/filepath"
"strings"
"sync"
"github.com/sohaha/zlsgo/zfile"
"github.com/sohaha/zlsgo/zlog"
"github.com/sohaha/zlsgo/zstring"
)
type htmlEngine struct {
log *zlog.Logger
funcmap map[string]interface{}
Templates *template.Template
directory string
options TemplateOptions
mutex sync.RWMutex
loaded bool
}
type TemplateOptions struct {
Extension string
Layout string
DelimLeft string
DelimRight string
Reload bool
Debug bool
}
func getTemplateOptions(debug bool, opt ...func(o *TemplateOptions)) TemplateOptions {
o := TemplateOptions{
Extension: ".html",
DelimLeft: "{{",
DelimRight: "}}",
Layout: "slot",
}
if debug {
o.Debug = true
o.Reload = true
}
for _, f := range opt {
f(&o)
}
return o
}
var _ Template = &htmlEngine{}
func newGoTemplate(e *Engine, directory string, opt ...func(o *TemplateOptions)) *htmlEngine {
h := &htmlEngine{
directory: directory,
funcmap: make(map[string]interface{}),
}
if e != nil {
h.log = e.Log
h.options = getTemplateOptions(e.IsDebug(), opt...)
} else {
h.log = zlog.New()
h.log.ResetFlags(zlog.BitLevel)
h.options = getTemplateOptions(true, opt...)
}
return h
}
func (e *htmlEngine) AddFunc(name string, fn interface{}) *htmlEngine {
e.mutex.Lock()
e.funcmap[name] = fn
e.mutex.Unlock()
return e
}
func (e *htmlEngine) SetFuncMap(m map[string]interface{}) *htmlEngine {
e.funcmap = m
return e
}
func (e *htmlEngine) Load() error {
if e.loaded && !e.options.Reload {
return nil
}
e.mutex.Lock()
defer e.mutex.Unlock()
e.Templates = template.New(e.directory)
e.Templates.Delims(e.options.DelimLeft, e.options.DelimRight)
e.Templates.Funcs(e.funcmap)
total := 0
tip := zstring.Buffer()
err := filepath.Walk(e.directory, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if info == nil || info.IsDir() {
return nil
}
if len(e.options.Extension) >= len(path) || path[len(path)-len(e.options.Extension):] != e.options.Extension {
return nil
}
rel, err := filepath.Rel(e.directory, path)
if err != nil {
return err
}
name := filepath.ToSlash(rel)
name = strings.TrimSuffix(name, e.options.Extension)
buf, err := zfile.ReadFile(path)
if err != nil {
return err
}
_, err = e.Templates.New(name).Parse(string(buf))
if err == nil {
if e.options.Debug {
total++
tip.WriteString("\t - " + name + "\n")
}
}
return err
})
if err == nil && !e.loaded && e.options.Debug {
e.log.Debugf("Loaded HTML Templates (%d): \n%s", total, tip.String())
}
e.loaded = true
return err
}
func (e *htmlEngine) Render(out io.Writer, template string, data interface{}, layout ...string) error {
if !e.loaded || e.options.Reload {
if err := e.Load(); err != nil {
return err
}
}
tmpl := e.Templates.Lookup(template)
if tmpl == nil {
return fmt.Errorf("template %s does not exist", template)
}
if len(layout) > 0 && layout[0] != "" {
lay := e.Templates.Lookup(layout[0])
if lay == nil {
return fmt.Errorf("layout %s does not exist", layout[0])
}
e.mutex.Lock()
defer e.mutex.Unlock()
lay.Funcs(map[string]interface{}{
e.options.Layout: func() error {
return tmpl.Execute(out, data)
},
})
return lay.Execute(out, data)
}
return tmpl.Execute(out, data)
}