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loader.go
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loader.go
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package djinn
import (
"io/ioutil"
"os"
"path/filepath"
)
type LoaderSet struct {
l []Loader
}
func NewLoaderSet() *LoaderSet {
return &LoaderSet{make([]Loader, 0)}
}
func (l *LoaderSet) AddLoaders(ls ...Loader) {
l.l = append(l.l, ls...)
}
func (l *LoaderSet) GetLoaders(ls ...Loader) []Loader {
return l.l
}
type Loader interface {
Load(string) (string, error)
ListTemplates() []string
}
type BaseLoader struct {
Errors []error
FileExtensions []string
}
var NoLoadMethod = Drror("load method not implemented")
func (b *BaseLoader) Load(name string) (string, error) {
return "", NoLoadMethod
}
func (b *BaseLoader) ListTemplates() []string {
return []string{"not implemented"}
}
func (b *BaseLoader) ValidExtension(ext string) bool {
for _, extension := range b.FileExtensions {
if extension == ext {
return true
}
}
return false
}
type dirLoader struct {
BaseLoader
Paths []string
}
var PathError = Drror("path: %s returned error").Out
func DirLoader(paths ...string) Loader {
d := &dirLoader{}
d.FileExtensions = append(d.FileExtensions, ".html", ".dji")
for _, p := range paths {
p, err := filepath.Abs(filepath.Clean(p))
if err != nil {
d.Errors = append(d.Errors, PathError(p))
}
d.Paths = append(d.Paths, p)
}
return d
}
func (l *dirLoader) Load(name string) (string, error) {
for _, p := range l.Paths {
f := filepath.Join(p, name)
if l.ValidExtension(filepath.Ext(f)) {
if _, err := os.Stat(f); err == nil {
file, err := os.Open(f)
r, err := ioutil.ReadAll(file)
return string(r), err
}
}
}
return "", NoTemplateError(name)
}
func (l *dirLoader) ListTemplates() []string {
var listing []string
for _, p := range l.Paths {
filepath.Walk(p, func(path string, _ os.FileInfo, _ error) (err error) {
tem := filepath.Base(path)
if l.ValidExtension(filepath.Ext(tem)) {
listing = append(listing, tem)
}
return err
})
}
return listing
}
type mapLoader struct {
BaseLoader
TemplateMap map[string]string
}
func MapLoader(tm ...map[string]string) Loader {
m := &mapLoader{TemplateMap: make(map[string]string)}
for _, t := range tm {
for k, v := range t {
m.TemplateMap[k] = v
}
}
return m
}
func (l *mapLoader) Load(name string) (string, error) {
if r, ok := l.TemplateMap[name]; ok {
return string(r), nil
}
return "", NoTemplateError(name)
}
func (l *mapLoader) ListTemplates() []string {
var listing []string
for k, _ := range l.TemplateMap {
listing = append(listing, k)
}
return listing
}