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templates.go
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templates.go
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package main
import (
"bytes"
"embed"
"fmt"
"go/format"
"log"
"path"
"strings"
"text/template"
)
var (
tmplNames = []string{"struct.tmpl", "constructor.tmpl", "optional.tmpl"}
headerTmpl = "header.tmpl"
)
//go:embed templates/*
var tmplFiles embed.FS
func prepareTemplates() (map[string]*template.Template, error) {
var err error
tmpls := make(map[string]*template.Template)
funcs := template.FuncMap{
"ToLower": strings.ToLower,
"Join": func(sep string, str ...string) string { return strings.Join(str, sep) },
"Title": strings.Title,
"Dict": dict,
"ConvertType": func(t any) any {
switch i := t.(type) {
case int:
return i
case string:
return fmt.Sprintf("%q", i)
default:
return t
}
},
}
for _, v := range tmplNames {
if tmpls[v], err = template.New(v).Funcs(funcs).ParseFS(tmplFiles, path.Join("templates", v)); err != nil {
return nil, err
}
}
return tmpls, nil
}
func genFromSchema(tmpls map[string]*template.Template, schema Schema, ah bool, packageName string) ([]byte, error) {
genBuf := bytes.NewBuffer([]byte{})
genBuf.WriteString(fmt.Sprintf("package %s\n\n", packageName))
if ah {
addHeader(genBuf)
}
for _, s := range schema {
for _, t := range tmplNames {
err := tmpls[t].Execute(genBuf, s)
if err != nil {
log.Fatalf("error executing template: %s", err)
}
}
}
formatted, err := format.Source(genBuf.Bytes())
if err != nil {
fmt.Println(genBuf.String())
log.Fatalf("error formatting source: %s", err)
}
return formatted, nil
}
func addHeader(buf *bytes.Buffer) {
header, _ := tmplFiles.ReadFile(path.Join("templates", headerTmpl))
buf.Write(header)
return
}
func dict(elem ...any) map[string]interface{} {
if len(elem)%2 != 0 {
panic("dict: odd number of elements")
}
d := make(map[string]interface{}, len(elem)/2)
for i := 0; i < len(elem); i += 2 {
key, ok := elem[i].(string)
if !ok {
panic("dict: key not a string")
}
d[key] = elem[i+1]
}
return d
}