/
types.go
226 lines (190 loc) · 5.98 KB
/
types.go
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package main
import (
"fmt"
"strings"
"github.com/dave/jennifer/jen"
)
type (
EnumType struct {
name string
fields FieldTypes
enumValues EnumValues
}
EnumValue struct {
Name string
fields FieldValues
}
FieldTypes []FieldType
FieldValues []FieldValue
EnumValues []EnumValue
FieldType struct {
Name string
Type string
}
FieldValue struct {
Name string
Value any
}
)
const (
OrdinalField = "_ordinal"
NameField = "_name"
DefaultFieldCount = 2
)
var defaultFields = []FieldType{
{
Name: OrdinalField,
Type: Int,
},
{
Name: NameField,
Type: String,
},
}
func (e *EnumType) toCode() []jen.Code {
structName := MakeFirstLetterUpperCase(e.name)
pluralStructName := MakePlural(structName)
add := jen.
Comment(fmt.Sprintf("%s type definition", structName)).Line().
Type().Id(structName).Struct(e.fields.toCode()...).Line().
Comment(pluralStructName).Line().
Var().Defs(e.enumValues.toCode(structName)...).Line().
Add(e.fields.GetMethods(structName)...).
Add(getAllFunction(structName, e.enumValues)...)
return *add
}
func (e *EnumType) addDefaultTypes() {
e.fields = append(e.fields, defaultFields...)
}
func getDefaultValues(ordinal int, name string) []FieldValue {
return []FieldValue{
{
Name: OrdinalField,
Value: ordinal,
},
{
Name: NameField,
Value: name,
},
}
}
func getAllFunction(structName string, vals EnumValues) []jen.Code {
all := make([]jen.Code, 0)
count := len(vals)
for _, val := range vals {
a := jen.Id(val.Name)
all = append(all, a)
}
a := jen.Func().Id(GetAllFunctionName(structName)).
Params().Index(jen.Lit(count)).Id(structName).
Block(jen.Return(jen.Index(jen.Lit(count)).Id(structName).Values(all...)))
return *a
}
func (f FieldTypes) toCode() []jen.Code {
statements := make([]jen.Code, 0)
for _, fieldType := range f {
id := jen.Id(MakeFirstLetterLowerCase(fieldType.Name)).Id(fieldType.Type)
statements = append(statements, id)
}
return statements
}
func (f FieldTypes) GetMethods(structName string) []jen.Code {
statements := make([]jen.Code, 0)
receiverName := GetFirstLetterInLowerCase(structName)
for i := DefaultFieldCount; i < len(f); i++ {
fieldType := f[i]
id := jen.Func().Params(jen.Id(receiverName).Id(structName)).Id(MakeFirstLetterUpperCase(fieldType.Name)).
Params().Id(fieldType.Type).Block(
jen.Return(jen.Id(receiverName).Dot(fieldType.Name)),
).Line().Line()
statements = append(statements, id)
}
// add stringer methods
stringerMethod := jen.Func().Params(jen.Id(receiverName).Id(structName)).Id("String").
Params().Id("string").Block(
jen.Return(jen.Id(receiverName).Dot(NameField)),
).Line().Line()
statements = append(statements, stringerMethod)
// add isValid methods
isValidMethod := jen.Func().Params(jen.Id(receiverName).Id(structName)).Id("IsValid").
Params().Id("bool").Block(
jen.Return(jen.Id(receiverName).Op("!=").Id(structName).Block()),
).Line().Line()
statements = append(statements, isValidMethod)
// add db Value method
valueFunction := jen.Func().Params(jen.Id(receiverName).Id(structName)).
Id("Value").Params().Params(
jen.Qual("database/sql/driver", "Value"), jen.Error()).Block(
jen.Return(jen.Id(receiverName).Dot(NameField).Op(",").Nil()),
).Line().Line()
statements = append(statements, valueFunction)
// add db scanner
scanFunction := jen.Func().Params(jen.Id(receiverName).Op("*").Id(structName)).
Id("Scan").Params(jen.Id("value").Any()).Params(jen.Error()).Block(
jen.
If(jen.Id("value").Op("==").Nil()).
Block(jen.Return(jen.Nil())).Line().
If(jen.Id(NameField).Op(",").Err().Op(":=").
Qual("database/sql/driver", "String").Dot("ConvertValue").
Call(jen.Id("value")).Op(";").Err().Op("==").Nil()).Block(
jen.For(
jen.Id("_").Op(",").Id("eval").Op(":=").
Range().Id(GetAllFunctionName(structName)).Call().Block(
jen.If(jen.Id("eval").Dot(NameField).Op("==").Id(NameField)).Block(
jen.Id("*").Id(receiverName).Op("=").Id("eval").Line().
Return(jen.Nil()),
),
),
),
).Line().Line().
Return(jen.Qual("errors", "New").Call(jen.Lit("failed to scan " + structName))),
).Line().Line()
statements = append(statements, scanFunction)
// add json Marshall method
marshallFunction := jen.Func().Params(jen.Id(receiverName).Id(structName)).
Id("MarshalJSON").Params().Params(
jen.Index().Byte(), jen.Error()).Block(
jen.Return(jen.Qual("encoding/json", "Marshal").Params(jen.Id(receiverName).Dot(NameField))),
).Line().Line()
statements = append(statements, marshallFunction)
unmarshallFunction := jen.Func().Params(jen.Id(receiverName).Op("*").Id(structName)).
Id("UnmarshalJSON").Params(jen.Id("bytes").Index().Byte()).Error().Block(
jen.Id(NameField).Op(":=").Lit("").Line().
If(jen.Id("err").Op(":=").Qual("encoding/json", "Unmarshal").
Call(jen.Id("bytes"), jen.Op("&").Id(NameField)).Op(";").
Id("err").Op("!=").Nil().Block(
jen.Return(jen.Id("err")),
)).Line().
For(
jen.Id("_").Op(",").Id("eval").Op(":=").
Range().Id(GetAllFunctionName(structName)).Call().Block(
jen.If(jen.Id("eval").Dot(NameField).Op("==").Id(NameField)).Block(
jen.Id("*").Id(receiverName).Op("=").Id("eval").Line().
Return(jen.Nil()),
),
),
).Line().Line().
Return(jen.Qual("errors", "New").Call(jen.Lit(strings.ToLower(structName) + " does not exist"))),
).Line().Line()
statements = append(statements, unmarshallFunction)
return statements
}
func (e EnumValues) toCode(structName string) []jen.Code {
statements := make([]jen.Code, 0)
for _, value := range e {
block := jen.Line().
Id(value.Name).Op("=").Id(structName).
Block(value.fields.toCode()...).Line()
statements = append(statements, block)
}
return statements
}
func (f FieldValues) toCode() []jen.Code {
statements := make([]jen.Code, 0)
for _, value := range f {
// TODO use values
code := jen.Id(MakeFirstLetterLowerCase(value.Name)).Op(":").Lit(value.Value).Id(",")
statements = append(statements, code)
}
return statements
}