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template.go
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template.go
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// Copyright 2014 beego Author. All Rights Reserved.
//
// 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 beego
import (
"errors"
"fmt"
"html/template"
"io/ioutil"
"os"
"path/filepath"
"regexp"
"strings"
"github.com/astaxie/beego/utils"
)
var (
beegoTplFuncMap template.FuncMap
// beego template caching map and supported template file extensions.
BeeTemplates map[string]*template.Template
BeeTemplateExt []string
)
func init() {
BeeTemplates = make(map[string]*template.Template)
beegoTplFuncMap = make(template.FuncMap)
BeeTemplateExt = make([]string, 0)
BeeTemplateExt = append(BeeTemplateExt, "tpl", "html")
beegoTplFuncMap["dateformat"] = DateFormat
beegoTplFuncMap["date"] = Date
beegoTplFuncMap["compare"] = Compare
beegoTplFuncMap["substr"] = Substr
beegoTplFuncMap["html2str"] = Html2str
beegoTplFuncMap["str2html"] = Str2html
beegoTplFuncMap["htmlquote"] = Htmlquote
beegoTplFuncMap["htmlunquote"] = Htmlunquote
beegoTplFuncMap["renderform"] = RenderForm
beegoTplFuncMap["assets_js"] = AssetsJs
beegoTplFuncMap["assets_css"] = AssetsCss
beegoTplFuncMap["config"] = Config
// go1.2 added template funcs
// Comparisons
beegoTplFuncMap["eq"] = eq // ==
beegoTplFuncMap["ge"] = ge // >=
beegoTplFuncMap["gt"] = gt // >
beegoTplFuncMap["le"] = le // <=
beegoTplFuncMap["lt"] = lt // <
beegoTplFuncMap["ne"] = ne // !=
beegoTplFuncMap["urlfor"] = UrlFor // !=
}
// AddFuncMap let user to register a func in the template.
func AddFuncMap(key string, funname interface{}) error {
beegoTplFuncMap[key] = funname
return nil
}
type templatefile struct {
root string
files map[string][]string
}
func (self *templatefile) visit(paths string, f os.FileInfo, err error) error {
if f == nil {
return err
}
if f.IsDir() || (f.Mode()&os.ModeSymlink) > 0 {
return nil
}
if !HasTemplateExt(paths) {
return nil
}
replace := strings.NewReplacer("\\", "/")
a := []byte(paths)
a = a[len([]byte(self.root)):]
file := strings.TrimLeft(replace.Replace(string(a)), "/")
subdir := filepath.Dir(file)
if _, ok := self.files[subdir]; ok {
self.files[subdir] = append(self.files[subdir], file)
} else {
m := make([]string, 1)
m[0] = file
self.files[subdir] = m
}
return nil
}
// return this path contains supported template extension of beego or not.
func HasTemplateExt(paths string) bool {
for _, v := range BeeTemplateExt {
if strings.HasSuffix(paths, "."+v) {
return true
}
}
return false
}
// add new extension for template.
func AddTemplateExt(ext string) {
for _, v := range BeeTemplateExt {
if v == ext {
return
}
}
BeeTemplateExt = append(BeeTemplateExt, ext)
}
// build all template files in a directory.
// it makes beego can render any template file in view directory.
func BuildTemplate(dir string) error {
if _, err := os.Stat(dir); err != nil {
if os.IsNotExist(err) {
return nil
} else {
return errors.New("dir open err")
}
}
self := &templatefile{
root: dir,
files: make(map[string][]string),
}
err := filepath.Walk(dir, func(path string, f os.FileInfo, err error) error {
return self.visit(path, f, err)
})
if err != nil {
fmt.Printf("filepath.Walk() returned %v\n", err)
return err
}
for _, v := range self.files {
for _, file := range v {
t, err := getTemplate(self.root, file, v...)
if err != nil {
Trace("parse template err:", file, err)
} else {
BeeTemplates[file] = t
}
}
}
return nil
}
func getTplDeep(root, file, parent string, t *template.Template) (*template.Template, [][]string, error) {
var fileabspath string
if filepath.HasPrefix(file, "../") {
fileabspath = filepath.Join(root, filepath.Dir(parent), file)
} else {
fileabspath = filepath.Join(root, file)
}
if e := utils.FileExists(fileabspath); !e {
panic("can't find template file:" + file)
}
data, err := ioutil.ReadFile(fileabspath)
if err != nil {
return nil, [][]string{}, err
}
t, err = t.New(file).Parse(string(data))
if err != nil {
return nil, [][]string{}, err
}
reg := regexp.MustCompile(TemplateLeft + "[ ]*template[ ]+\"([^\"]+)\"")
allsub := reg.FindAllStringSubmatch(string(data), -1)
for _, m := range allsub {
if len(m) == 2 {
tlook := t.Lookup(m[1])
if tlook != nil {
continue
}
if !HasTemplateExt(m[1]) {
continue
}
t, _, err = getTplDeep(root, m[1], file, t)
if err != nil {
return nil, [][]string{}, err
}
}
}
return t, allsub, nil
}
func getTemplate(root, file string, others ...string) (t *template.Template, err error) {
t = template.New(file).Delims(TemplateLeft, TemplateRight).Funcs(beegoTplFuncMap)
var submods [][]string
t, submods, err = getTplDeep(root, file, "", t)
if err != nil {
return nil, err
}
t, err = _getTemplate(t, root, submods, others...)
if err != nil {
return nil, err
}
return
}
func _getTemplate(t0 *template.Template, root string, submods [][]string, others ...string) (t *template.Template, err error) {
t = t0
for _, m := range submods {
if len(m) == 2 {
templ := t.Lookup(m[1])
if templ != nil {
continue
}
//first check filename
for _, otherfile := range others {
if otherfile == m[1] {
var submods1 [][]string
t, submods1, err = getTplDeep(root, otherfile, "", t)
if err != nil {
Trace("template parse file err:", err)
} else if submods1 != nil && len(submods1) > 0 {
t, err = _getTemplate(t, root, submods1, others...)
}
break
}
}
//second check define
for _, otherfile := range others {
fileabspath := filepath.Join(root, otherfile)
data, err := ioutil.ReadFile(fileabspath)
if err != nil {
continue
}
reg := regexp.MustCompile(TemplateLeft + "[ ]*define[ ]+\"([^\"]+)\"")
allsub := reg.FindAllStringSubmatch(string(data), -1)
for _, sub := range allsub {
if len(sub) == 2 && sub[1] == m[1] {
var submods1 [][]string
t, submods1, err = getTplDeep(root, otherfile, "", t)
if err != nil {
Trace("template parse file err:", err)
} else if submods1 != nil && len(submods1) > 0 {
t, err = _getTemplate(t, root, submods1, others...)
}
break
}
}
}
}
}
return
}