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template.go
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template.go
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package ent2ogen
import (
"embed"
"fmt"
"text/template"
"entgo.io/ent/entc/gen"
"github.com/go-faster/errors"
"github.com/ogen-go/ogen/gen/ir"
)
var (
//go:embed _templates
templateDir embed.FS
// funcMap contains extra template functions used by ent2ogen.
funcMap = template.FuncMap{
"sprintf": fmt.Sprintf,
"errorf": func(format string, args ...interface{}) (interface{}, error) {
return nil, fmt.Errorf(format, args...)
},
"assign": assign,
"unassign": unassign,
"rendertype": rendertype,
}
// templates holds all templates used by ent2ogen.
templates = gen.MustParse(gen.NewTemplate("ent2ogen").Funcs(funcMap).ParseFS(templateDir, "_templates/*.tmpl"))
)
func assign(dst *ir.Field, src *gen.Field) (string, error) {
var (
assignT = "t." + dst.Name
srcT = "e." + src.StructField()
)
if src.Nillable {
srcT = "*" + srcT
}
if dst.Type.IsGeneric() {
if dst.Type.GenericOf.IsPrimitive() {
return assignT + ".SetTo(" + srcT + ")", nil
}
gotyp := dst.Type.GenericOf.Go()
return fmt.Sprintf("%s.SetTo(openapi.%s(%s))", assignT, gotyp, srcT), nil
}
if dst.Type.IsEnum() {
gotyp := dst.Type.Go()
return fmt.Sprintf("%s = openapi.%s(%s)", assignT, gotyp, srcT), nil
}
return fmt.Sprintf("%s = %s", assignT, srcT), nil
}
func unassign(dst *ir.Field) (string, error) {
assignT := "t." + dst.Name
type assignStmt struct {
variable string
value string
}
var stmts []assignStmt
if dst.Type.IsGeneric() {
if dst.Type.GenericVariant.Optional {
// Reset ogen's generic 'Set' field.
//
// t.Foo.Set = false
stmts = append(stmts, assignStmt{
variable: fmt.Sprintf("%s.Set", assignT),
value: "false",
})
}
if dst.Type.GenericVariant.Nullable {
// Reset ogen's generic 'Null' field.
//
// t.Foo.Null = true
stmts = append(stmts, assignStmt{
variable: fmt.Sprintf("%s.Null", assignT),
value: "true",
})
}
}
// From github.com/ogen-go/ogen/gen/generics.go:boxType
if dst.Type.GenericOf.Kind == ir.KindArray || dst.Type.GenericOf.Primitive == ir.ByteSlice {
if dst.Type.GenericVariant.NullableOptional() {
return "", errors.New("unexpected nullable & optional ogen array type")
}
// t.Foo = nil
stmts = append(stmts, assignStmt{
variable: assignT,
value: "nil",
})
}
// Represent assignments in a shorter form:
// foo, bar = true, false
oneliner := ""
for i, stmt := range stmts {
oneliner += stmt.variable
if i+1 != len(stmts) {
oneliner += ", "
}
}
oneliner += " = "
for i, stmt := range stmts {
oneliner += stmt.value
if i+1 != len(stmts) {
oneliner += ", "
}
}
return oneliner, nil
}
func rendertype(t *ir.Type) string {
switch t.Kind {
case ir.KindPrimitive:
return t.Go()
case ir.KindArray:
return "[]" + rendertype(t.Item)
default:
return "openapi." + t.Go()
}
}