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refactor(renderer): lazy loading of templates (#1062)
Fixes #1061 Signed-off-by: Xavier Coulon <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "fmt" | ||
| "go/ast" | ||
| "go/parser" | ||
| "go/token" | ||
| "log" | ||
| "text/template" | ||
| "unicode" | ||
| ) | ||
|
|
||
| const ( | ||
| sgmlRenderer = `package sgml | ||
| import ( | ||
| "sync" | ||
| text "text/template" | ||
| ) | ||
| type sgmlRenderer struct { | ||
| templates Templates | ||
| functions text.FuncMap | ||
| {{ range $i, $tmpl := . }} | ||
| {{ once $tmpl}} sync.Once | ||
| {{ tmpl $tmpl}} *text.Template | ||
| {{ end }} | ||
| } | ||
| {{ range $i, $tmpl := . }} | ||
| func (r *sgmlRenderer) {{ func $tmpl }} (*text.Template, error) { | ||
| var err error | ||
| r.{{ once $tmpl }}.Do(func() { | ||
| r.{{ tmpl $tmpl }}, err = r.newTemplate("{{ $tmpl }}", r.templates.{{ $tmpl }}, err) | ||
| }) | ||
| return r.{{ tmpl $tmpl }}, err | ||
| } | ||
| {{ end }} | ||
| ` | ||
| ) | ||
|
|
||
| func main() { | ||
| // read the content of pkg/renderer/sgml/templates.go | ||
| fs := token.NewFileSet() | ||
| f, err := parser.ParseFile(fs, "pkg/renderer/sgml/templates.go", nil, parser.AllErrors) | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| v := &visitor{ | ||
| fields: []string{}, | ||
| } | ||
| ast.Walk(v, f) | ||
| tmpl, err := template.New("templates").Funcs(template.FuncMap{ | ||
| "once": func(s string) string { | ||
| return string(unicode.ToLower(rune(s[0]))) + s[1:] + "Once" | ||
| }, | ||
| "func": func(s string) string { | ||
| return string(unicode.ToLower(rune(s[0]))) + s[1:] + "()" | ||
| }, | ||
| "tmpl": func(s string) string { | ||
| return string(unicode.ToLower(rune(s[0]))) + s[1:] + "Tmpl" | ||
| }, | ||
| }).Parse(sgmlRenderer) | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| // fmt.Printf("templates: %v\n", v.fields) | ||
| result := &bytes.Buffer{} | ||
| if err := tmpl.Execute(result, v.fields); err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| fmt.Printf("%s\n", result.String()) | ||
| } | ||
|
|
||
| type visitor struct { | ||
| fields []string | ||
| } | ||
|
|
||
| func (v *visitor) Visit(n ast.Node) ast.Visitor { | ||
| if n == nil { | ||
| return nil | ||
| } | ||
| if f, ok := n.(*ast.Field); ok { | ||
| v.fields = append(v.fields, f.Names[0].Name) | ||
| } | ||
| return v | ||
| } |
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