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Beego/template.go
Nedzad Smajic 94ed35e781
Register .gohtml extension
Goland as of 2018.3 seems to support only '.tpl.gohtml" and ".gohtml" templates. The regular ".tpl" templates will be rendered as plain text files which is not acceptable.
2019-02-23 22:49:32 +01:00

407 lines
12 KiB
Go

// 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"
"io/ioutil"
"net/http"
"os"
"path/filepath"
"regexp"
"strings"
"sync"
"github.com/astaxie/beego/logs"
"github.com/astaxie/beego/utils"
)
var (
beegoTplFuncMap = make(template.FuncMap)
beeViewPathTemplateLocked = false
// beeViewPathTemplates caching map and supported template file extensions per view
beeViewPathTemplates = make(map[string]map[string]*template.Template)
templatesLock sync.RWMutex
// beeTemplateExt stores the template extension which will build
beeTemplateExt = []string{"tpl", "html", "gohtml"}
// beeTemplatePreprocessors stores associations of extension -> preprocessor handler
beeTemplateEngines = map[string]templatePreProcessor{}
beeTemplateFS = defaultFSFunc
)
// ExecuteTemplate applies the template with name to the specified data object,
// writing the output to wr.
// A template will be executed safely in parallel.
func ExecuteTemplate(wr io.Writer, name string, data interface{}) error {
return ExecuteViewPathTemplate(wr, name, BConfig.WebConfig.ViewsPath, data)
}
// ExecuteViewPathTemplate applies the template with name and from specific viewPath to the specified data object,
// writing the output to wr.
// A template will be executed safely in parallel.
func ExecuteViewPathTemplate(wr io.Writer, name string, viewPath string, data interface{}) error {
if BConfig.RunMode == DEV {
templatesLock.RLock()
defer templatesLock.RUnlock()
}
if beeTemplates, ok := beeViewPathTemplates[viewPath]; ok {
if t, ok := beeTemplates[name]; ok {
var err error
if t.Lookup(name) != nil {
err = t.ExecuteTemplate(wr, name, data)
} else {
err = t.Execute(wr, data)
}
if err != nil {
logs.Trace("template Execute err:", err)
}
return err
}
panic("can't find templatefile in the path:" + viewPath + "/" + name)
}
panic("Unknown view path:" + viewPath)
}
func init() {
beegoTplFuncMap["dateformat"] = DateFormat
beegoTplFuncMap["date"] = Date
beegoTplFuncMap["compare"] = Compare
beegoTplFuncMap["compare_not"] = CompareNot
beegoTplFuncMap["not_nil"] = NotNil
beegoTplFuncMap["not_null"] = NotNil
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"] = GetConfig
beegoTplFuncMap["map_get"] = MapGet
// Comparisons
beegoTplFuncMap["eq"] = eq // ==
beegoTplFuncMap["ge"] = ge // >=
beegoTplFuncMap["gt"] = gt // >
beegoTplFuncMap["le"] = le // <=
beegoTplFuncMap["lt"] = lt // <
beegoTplFuncMap["ne"] = ne // !=
beegoTplFuncMap["urlfor"] = URLFor // build a URL to match a Controller and it's method
}
// AddFuncMap let user to register a func in the template.
func AddFuncMap(key string, fn interface{}) error {
beegoTplFuncMap[key] = fn
return nil
}
type templatePreProcessor func(root, path string, funcs template.FuncMap) (*template.Template, error)
type templateFile struct {
root string
files map[string][]string
}
// visit will make the paths into two part,the first is subDir (without tf.root),the second is full path(without tf.root).
// if tf.root="views" and
// paths is "views/errors/404.html",the subDir will be "errors",the file will be "errors/404.html"
// paths is "views/admin/errors/404.html",the subDir will be "admin/errors",the file will be "admin/errors/404.html"
func (tf *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("\\", "/")
file := strings.TrimLeft(replace.Replace(paths[len(tf.root):]), "/")
subDir := filepath.Dir(file)
tf.files[subDir] = append(tf.files[subDir], file)
return nil
}
// HasTemplateExt 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
}
// AddTemplateExt add new extension for template.
func AddTemplateExt(ext string) {
for _, v := range beeTemplateExt {
if v == ext {
return
}
}
beeTemplateExt = append(beeTemplateExt, ext)
}
// AddViewPath adds a new path to the supported view paths.
//Can later be used by setting a controller ViewPath to this folder
//will panic if called after beego.Run()
func AddViewPath(viewPath string) error {
if beeViewPathTemplateLocked {
if _, exist := beeViewPathTemplates[viewPath]; exist {
return nil //Ignore if viewpath already exists
}
panic("Can not add new view paths after beego.Run()")
}
beeViewPathTemplates[viewPath] = make(map[string]*template.Template)
return BuildTemplate(viewPath)
}
func lockViewPaths() {
beeViewPathTemplateLocked = true
}
// BuildTemplate will build all template files in a directory.
// it makes beego can render any template file in view directory.
func BuildTemplate(dir string, files ...string) error {
var err error
fs := beeTemplateFS()
f, err := fs.Open(dir)
if err != nil {
if os.IsNotExist(err) {
return nil
}
return errors.New("dir open err")
}
defer f.Close()
beeTemplates, ok := beeViewPathTemplates[dir]
if !ok {
panic("Unknown view path: " + dir)
}
self := &templateFile{
root: dir,
files: make(map[string][]string),
}
err = Walk(fs, dir, func(path string, f os.FileInfo, err error) error {
return self.visit(path, f, err)
})
if err != nil {
fmt.Printf("Walk() returned %v\n", err)
return err
}
buildAllFiles := len(files) == 0
for _, v := range self.files {
for _, file := range v {
if buildAllFiles || utils.InSlice(file, files) {
templatesLock.Lock()
ext := filepath.Ext(file)
var t *template.Template
if len(ext) == 0 {
t, err = getTemplate(self.root, fs, file, v...)
} else if fn, ok := beeTemplateEngines[ext[1:]]; ok {
t, err = fn(self.root, file, beegoTplFuncMap)
} else {
t, err = getTemplate(self.root, fs, file, v...)
}
if err != nil {
logs.Error("parse template err:", file, err)
templatesLock.Unlock()
return err
}
beeTemplates[file] = t
templatesLock.Unlock()
}
}
}
return nil
}
func getTplDeep(root string, fs http.FileSystem, file string, parent string, t *template.Template) (*template.Template, [][]string, error) {
var fileAbsPath string
var rParent string
var err error
if strings.HasPrefix(file, "../") {
rParent = filepath.Join(filepath.Dir(parent), file)
fileAbsPath = filepath.Join(root, filepath.Dir(parent), file)
} else {
rParent = file
fileAbsPath = filepath.Join(root, file)
}
f, err := fs.Open(fileAbsPath)
if err != nil {
panic("can't find template file:" + file)
}
defer f.Close()
data, err := ioutil.ReadAll(f)
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(BConfig.WebConfig.TemplateLeft + "[ ]*template[ ]+\"([^\"]+)\"")
allSub := reg.FindAllStringSubmatch(string(data), -1)
for _, m := range allSub {
if len(m) == 2 {
tl := t.Lookup(m[1])
if tl != nil {
continue
}
if !HasTemplateExt(m[1]) {
continue
}
_, _, err = getTplDeep(root, fs, m[1], rParent, t)
if err != nil {
return nil, [][]string{}, err
}
}
}
return t, allSub, nil
}
func getTemplate(root string, fs http.FileSystem, file string, others ...string) (t *template.Template, err error) {
t = template.New(file).Delims(BConfig.WebConfig.TemplateLeft, BConfig.WebConfig.TemplateRight).Funcs(beegoTplFuncMap)
var subMods [][]string
t, subMods, err = getTplDeep(root, fs, file, "", t)
if err != nil {
return nil, err
}
t, err = _getTemplate(t, root, fs, subMods, others...)
if err != nil {
return nil, err
}
return
}
func _getTemplate(t0 *template.Template, root string, fs http.FileSystem, subMods [][]string, others ...string) (t *template.Template, err error) {
t = t0
for _, m := range subMods {
if len(m) == 2 {
tpl := t.Lookup(m[1])
if tpl != nil {
continue
}
//first check filename
for _, otherFile := range others {
if otherFile == m[1] {
var subMods1 [][]string
t, subMods1, err = getTplDeep(root, fs, otherFile, "", t)
if err != nil {
logs.Trace("template parse file err:", err)
} else if len(subMods1) > 0 {
t, err = _getTemplate(t, root, fs, subMods1, others...)
}
break
}
}
//second check define
for _, otherFile := range others {
var data []byte
fileAbsPath := filepath.Join(root, otherFile)
f, err := fs.Open(fileAbsPath)
if err != nil {
f.Close()
logs.Trace("template file parse error, not success open file:", err)
continue
}
data, err = ioutil.ReadAll(f)
f.Close()
if err != nil {
logs.Trace("template file parse error, not success read file:", err)
continue
}
reg := regexp.MustCompile(BConfig.WebConfig.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, fs, otherFile, "", t)
if err != nil {
logs.Trace("template parse file err:", err)
} else if len(subMods1) > 0 {
t, err = _getTemplate(t, root, fs, subMods1, others...)
if err != nil {
logs.Trace("template parse file err:", err)
}
}
break
}
}
}
}
}
return
}
type templateFSFunc func() http.FileSystem
func defaultFSFunc() http.FileSystem {
return FileSystem{}
}
// SetTemplateFSFunc set default filesystem function
func SetTemplateFSFunc(fnt templateFSFunc) {
beeTemplateFS = fnt
}
// SetViewsPath sets view directory path in beego application.
func SetViewsPath(path string) *App {
BConfig.WebConfig.ViewsPath = path
return BeeApp
}
// SetStaticPath sets static directory path and proper url pattern in beego application.
// if beego.SetStaticPath("static","public"), visit /static/* to load static file in folder "public".
func SetStaticPath(url string, path string) *App {
if !strings.HasPrefix(url, "/") {
url = "/" + url
}
if url != "/" {
url = strings.TrimRight(url, "/")
}
BConfig.WebConfig.StaticDir[url] = path
return BeeApp
}
// DelStaticPath removes the static folder setting in this url pattern in beego application.
func DelStaticPath(url string) *App {
if !strings.HasPrefix(url, "/") {
url = "/" + url
}
if url != "/" {
url = strings.TrimRight(url, "/")
}
delete(BConfig.WebConfig.StaticDir, url)
return BeeApp
}
// AddTemplateEngine add a new templatePreProcessor which support extension
func AddTemplateEngine(extension string, fn templatePreProcessor) *App {
AddTemplateExt(extension)
beeTemplateEngines[extension] = fn
return BeeApp
}