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declarer_enum.go
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/
declarer_enum.go
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package golang
import (
"strconv"
"strings"
"github.com/eddiefisher/pggen/internal/codegen/golang/gotype"
)
func NameEnumTranscoderFunc(typ *gotype.EnumType) string {
return "new" + typ.Name + "Enum"
}
// EnumTypeDeclarer declares a new string type and the const values to map to a
// Postgres enum.
type EnumTypeDeclarer struct {
enum *gotype.EnumType
}
func NewEnumTypeDeclarer(enum *gotype.EnumType) EnumTypeDeclarer {
return EnumTypeDeclarer{enum: enum}
}
func (e EnumTypeDeclarer) DedupeKey() string {
return "enum_type::" + e.enum.Name
}
func (e EnumTypeDeclarer) Declare(string) (string, error) {
sb := &strings.Builder{}
// Doc string.
if e.enum.PgEnum.Name != "" {
sb.WriteString("// ")
sb.WriteString(e.enum.Name)
sb.WriteString(" represents the Postgres enum ")
sb.WriteString(strconv.Quote(e.enum.PgEnum.Name))
sb.WriteString(".\n")
}
// Type declaration.
sb.WriteString("type ")
sb.WriteString(e.enum.Name)
sb.WriteString(" string\n\n")
// Const enum values.
sb.WriteString("const (\n")
nameLen := 0
for _, label := range e.enum.Labels {
if len(label) > nameLen {
nameLen = len(label)
}
}
for i, label := range e.enum.Labels {
sb.WriteString("\t")
sb.WriteString(label)
sb.WriteString(strings.Repeat(" ", nameLen+1-len(label)))
sb.WriteString(e.enum.Name)
sb.WriteString(` = `)
sb.WriteString(strconv.Quote(e.enum.Values[i]))
sb.WriteByte('\n')
}
sb.WriteString(")\n\n")
// Stringer
dispatcher := strings.ToLower(e.enum.Name)[0]
sb.WriteString("func (")
sb.WriteByte(dispatcher)
sb.WriteByte(' ')
sb.WriteString(e.enum.Name)
sb.WriteString(") String() string { return string(")
sb.WriteByte(dispatcher)
sb.WriteString(") }")
return sb.String(), nil
}
// EnumTranscoderDeclarer declares a new Go function that creates a pgx decoder
// for the Postgres type represented by the gotype.EnumType.
type EnumTranscoderDeclarer struct {
typ *gotype.EnumType
}
func NewEnumTranscoderDeclarer(enum *gotype.EnumType) EnumTranscoderDeclarer {
return EnumTranscoderDeclarer{typ: enum}
}
func (e EnumTranscoderDeclarer) DedupeKey() string {
return "enum_decoder::" + e.typ.Name
}
func (e EnumTranscoderDeclarer) Declare(string) (string, error) {
sb := &strings.Builder{}
funcName := NameEnumTranscoderFunc(e.typ)
// Doc comment
sb.WriteString("// ")
sb.WriteString(funcName)
sb.WriteString(" creates a new pgtype.ValueTranscoder for the\n")
sb.WriteString("// Postgres enum type '")
sb.WriteString(e.typ.PgEnum.Name)
sb.WriteString("'.\n")
// Function signature
sb.WriteString("func ")
sb.WriteString(funcName)
sb.WriteString("() pgtype.ValueTranscoder {\n\t")
// NewEnumType call
sb.WriteString("return pgtype.NewEnumType(\n\t\t")
sb.WriteString(strconv.Quote(e.typ.PgEnum.Name))
sb.WriteString(",\n\t\t")
sb.WriteString(`[]string{`)
for _, label := range e.typ.Labels {
sb.WriteString("\n\t\t\t")
sb.WriteString("string(")
sb.WriteString(label)
sb.WriteString("),")
}
sb.WriteString("\n\t\t")
sb.WriteString("},")
sb.WriteString("\n\t")
sb.WriteString(")")
sb.WriteString("\n")
sb.WriteString("}")
return sb.String(), nil
}