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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,34 @@ | ||
| package i18n | ||
|
|
||
| import ( | ||
| "sync" | ||
| ) | ||
|
|
||
| // Template stores the template for a string. | ||
| type Template struct { | ||
| Src string | ||
| LeftDelim string | ||
| RightDelim string | ||
|
|
||
| parseOnce sync.Once | ||
| parsedTemplate ParsedTemplate | ||
| parseError error | ||
| } | ||
|
|
||
| func (t *Template) execute(engine TemplateEngine, data interface{}) (string, error) { | ||
| var pt ParsedTemplate | ||
| var err error | ||
| if engine.Cacheable() { | ||
| t.parseOnce.Do(func() { | ||
| t.parsedTemplate, t.parseError = engine.ParseTemplate(t.Src, t.LeftDelim, t.RightDelim) | ||
| }) | ||
| pt, err = t.parsedTemplate, t.parseError | ||
| } else { | ||
| pt, err = engine.ParseTemplate(t.Src, t.LeftDelim, t.RightDelim) | ||
| } | ||
|
|
||
| if err != nil { | ||
| return "", err | ||
| } | ||
| return pt.Execute(data) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,150 @@ | ||
| package i18n | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "strings" | ||
| texttemplate "text/template" | ||
| ) | ||
|
|
||
| type ParsedTemplate interface { | ||
| Execute(data any) (string, error) | ||
| } | ||
|
|
||
| type TemplateEngine interface { | ||
| // Cacheable returns true if the ParsedTemplate returned by ParseTemplate is safe to cache. | ||
| Cacheable() bool | ||
|
|
||
| ParseTemplate(src, leftDelim, rightDelim string) (ParsedTemplate, error) | ||
| } | ||
|
|
||
| type NoTemplateEngine struct{} | ||
|
|
||
| func (NoTemplateEngine) Cacheable() bool { | ||
| // Caching is not necessary because ParseTemplate is cheap. | ||
| return false | ||
| } | ||
|
|
||
| func (NoTemplateEngine) ParseTemplate(src, leftDelim, rightDelim string) (ParsedTemplate, error) { | ||
| return &identityParsedTemplate{src: src}, nil | ||
| } | ||
|
|
||
| type TextTemplateEngine struct { | ||
| LeftDelim string | ||
| RightDelim string | ||
| Funcs texttemplate.FuncMap | ||
| Option string | ||
| } | ||
|
|
||
| func (te *TextTemplateEngine) Cacheable() bool { | ||
| return te.Funcs == nil | ||
| } | ||
|
|
||
| func (te *TextTemplateEngine) ParseTemplate(src, leftDelim, rightDelim string) (ParsedTemplate, error) { | ||
| if leftDelim == "" { | ||
| leftDelim = te.LeftDelim | ||
| } | ||
| if leftDelim == "" { | ||
| leftDelim = "{{" | ||
| } | ||
| if !strings.Contains(src, leftDelim) { | ||
| // Fast path to avoid parsing a template that has no actions. | ||
| return &identityParsedTemplate{src: src}, nil | ||
| } | ||
|
|
||
| if rightDelim == "" { | ||
| rightDelim = te.RightDelim | ||
| } | ||
| if rightDelim == "" { | ||
| rightDelim = "}}" | ||
| } | ||
|
|
||
| tmpl, err := texttemplate.New("").Delims(leftDelim, rightDelim).Funcs(te.Funcs).Parse(src) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return &parsedTextTemplate{tmpl: tmpl}, nil | ||
| } | ||
|
|
||
| type identityParsedTemplate struct { | ||
| src string | ||
| } | ||
|
|
||
| func (t *identityParsedTemplate) Execute(data any) (string, error) { | ||
| return t.src, nil | ||
| } | ||
|
|
||
| type parsedTextTemplate struct { | ||
| tmpl *texttemplate.Template | ||
| } | ||
|
|
||
| func (t *parsedTextTemplate) Execute(data any) (string, error) { | ||
| var buf bytes.Buffer | ||
| if err := t.tmpl.Execute(&buf, data); err != nil { | ||
| return "", err | ||
| } | ||
| return buf.String(), nil | ||
| } | ||
|
|
||
| // type TemplateEngine interface { | ||
| // Execute(src string, data any) (string, error) | ||
| // } | ||
|
|
||
| // type NoTemplateEngine struct{} | ||
|
|
||
| // func (*NoTemplateEngine) Execute(src string, data any) (string, error) { | ||
| // return src, nil | ||
| // } | ||
|
|
||
| // type TextTemplateEngine2 struct { | ||
| // LeftDelim string | ||
| // RightDelim string | ||
| // Funcs texttemplate.FuncMap | ||
| // Option string | ||
|
|
||
| // cache map[string]*executeResult | ||
| // cacheMutex sync.RWMutex | ||
| // } | ||
|
|
||
| // type executeResult struct { | ||
| // tmpl *texttemplate.Template | ||
| // err error | ||
| // } | ||
|
|
||
| // func (t *TextTemplateEngine2) Execute(src string, data any) (string, error) { | ||
| // tmpl, err := t.getTemplate(src) | ||
| // if err != nil { | ||
| // return "", err | ||
| // } | ||
| // var buf bytes.Buffer | ||
| // if err := tmpl.Execute(&buf, data); err != nil { | ||
| // return "", err | ||
| // } | ||
| // return buf.String(), nil | ||
| // } | ||
|
|
||
| // func (t *TextTemplateEngine2) getTemplate(template string) (*texttemplate.Template, error) { | ||
| // // It is not safe to use the cache if t.Funcs or t.Option is set. | ||
| // if t.Funcs != nil || t.Option != "" { | ||
| // return texttemplate.New("").Delims(t.LeftDelim, t.RightDelim).Funcs(t.Funcs).Option(t.Option).Parse(template) | ||
| // } | ||
|
|
||
| // // If there is a cached result, return it. | ||
| // t.cacheMutex.RLock() | ||
| // result := t.cache[template] | ||
| // t.cacheMutex.RUnlock() | ||
| // if result != nil { | ||
| // return result.tmpl, result.err | ||
| // } | ||
|
|
||
| // // Parse the template and save it to the cache | ||
| // tmpl, err := texttemplate.New("").Delims(t.LeftDelim, t.RightDelim).Parse(template) | ||
| // r := &executeResult{ | ||
| // tmpl: tmpl, | ||
| // err: err, | ||
| // } | ||
| // t.cacheMutex.Lock() | ||
| // t.cache[template] = r | ||
| // t.cacheMutex.Unlock() | ||
|
|
||
| // return tmpl, err | ||
| // } | ||
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