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jet.go
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jet.go
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/*
Copyright 2017 Wenhui Shen <www.webx.top>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package jet
import (
"errors"
"fmt"
"io"
"path/filepath"
"github.com/admpub/jet/v6"
"github.com/admpub/log"
"github.com/webx-top/com"
"github.com/webx-top/echo"
"github.com/webx-top/echo/logger"
"github.com/webx-top/echo/middleware/render"
"github.com/webx-top/echo/middleware/render/driver"
"github.com/webx-top/poolx/bufferpool"
)
func init() {
render.Reg(`jet`, func(tmplDir string) driver.Driver {
return New(tmplDir)
})
}
func New(templateDir string, args ...logger.Logger) driver.Driver {
var err error
templateDir, err = filepath.Abs(templateDir)
if err != nil {
panic(err.Error())
}
a := &Jet{
NopRenderer: &driver.NopRenderer{},
templateDir: templateDir,
set: jet.NewSet(jet.NewOSFileSystemLoader(templateDir)),
}
if len(args) > 0 {
a.logger = args[0]
} else {
a.logger = log.New("render-jet")
}
return a
}
type Jet struct {
*driver.NopRenderer
set *jet.Set
templateDir string
logger logger.Logger
debug bool
tmplPathFixer func(echo.Context, string) string
}
func (a *Jet) Debug() bool {
return a.debug
}
func (a *Jet) SetDebug(on bool) {
a.debug = on
a.set.SetDevelopmentMode(on)
}
func (a *Jet) SetLogger(l logger.Logger) {
a.logger = l
}
func (a *Jet) Logger() logger.Logger {
return a.logger
}
func (a *Jet) TmplDir() string {
return a.templateDir
}
func (a *Jet) SetTmplPathFixer(fn func(echo.Context, string) string) {
a.tmplPathFixer = fn
}
func (a *Jet) TmplPath(c echo.Context, tmpl string) string {
if a.tmplPathFixer != nil {
tmpl = a.tmplPathFixer(c, tmpl)
}
return tmpl
}
func (a *Jet) SetFuncMap(fn func() map[string]interface{}) {
for name, fn := range fn() {
a.set.AddGlobal(name, fn)
}
}
func (a *Jet) Render(w io.Writer, tmpl string, data interface{}, c echo.Context) error {
tmpl = a.TmplPath(c, tmpl)
t, err := a.set.GetTemplate(tmpl)
if err != nil {
return err
}
vars := make(jet.VarMap)
for name, fn := range c.Funcs() {
vars.Set(name, fn)
}
return t.Execute(w, vars, data)
}
// RenderBy render by content
func (a *Jet) RenderBy(w io.Writer, tmplName string, tmplContent func(string) ([]byte, error), values interface{}, c echo.Context) error {
b, err := tmplContent(tmplName)
if err != nil {
return err
}
tmpl, err := a.set.Parse(tmplName, string(b))
if err != nil {
return err
}
vars := make(jet.VarMap)
for name, fn := range c.Funcs() {
vars.Set(name, fn)
}
return tmpl.Execute(w, vars, values)
}
func (a *Jet) Fetch(tmpl string, data interface{}, c echo.Context) string {
tmpl = a.TmplPath(c, tmpl)
w := bufferpool.Get()
defer bufferpool.Release(w)
t, err := a.set.GetTemplate(tmpl)
if err != nil {
return fmt.Sprintf("Parse %v err: %v", tmpl, err)
}
vars := make(jet.VarMap)
for name, fn := range c.Funcs() {
vars.Set(name, fn)
}
err = t.Execute(w, vars, data)
if err != nil {
return fmt.Sprintf("Parse %v err: %v", tmpl, err)
}
return com.Bytes2str(w.Bytes())
}
func (a *Jet) RawContent(tmpl string) (b []byte, e error) {
return nil, errors.New(`unsupported`)
}