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enumwriter.go
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/
enumwriter.go
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// Copyright (c) 2018 Palantir Technologies. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package conjure
import (
"github.com/dave/jennifer/jen"
"github.com/palantir/conjure-go/v6/conjure/snip"
"github.com/palantir/conjure-go/v6/conjure/types"
)
const (
enumReceiverName = "e"
enumUpperVarName = "v"
enumUnknownValue = "UNKNOWN"
enumStructFieldName = "val"
)
func writeEnumType(file *jen.Group, enumDef *types.EnumType) {
file.Add(enumDef.CommentLineWithDeprecation(enumDef.Deprecated)).Add(astForEnumTypeDecls(enumDef.Name))
file.Add(astForEnumValueConstants(enumDef.Name, enumDef.Values))
file.Add(astForEnumValuesFunction(enumDef.Name, enumDef.Values))
file.Add(astForEnumConstructor(enumDef.Name))
file.Add(astForEnumIsUnknown(enumDef.Name, enumDef.Values))
file.Add(astForEnumValueMethod(enumDef.Name))
file.Add(astForEnumStringMethod(enumDef.Name))
file.Add(astForEnumMarshalText(enumDef.Name))
file.Add(astForEnumUnmarshalText(enumDef.Name, enumDef.Values))
}
func astForEnumTypeDecls(typeName string) *jen.Statement {
return jen.Type().Id(typeName).Struct(jen.Id(enumStructFieldName).Id(typeName + "_Value")).
Line().Line().
Type().Id(typeName + "_Value").String()
}
func astForEnumValueConstants(typeName string, values []*types.Field) *jen.Statement {
return jen.Const().DefsFunc(func(consts *jen.Group) {
for _, valDef := range values {
consts.Add(valDef.CommentLineWithDeprecation(valDef.Deprecated)).
Id(typeName + "_" + valDef.Name).Id(typeName + "_Value").Op("=").Lit(valDef.Name)
}
consts.Id(typeName + "_" + enumUnknownValue).Id(typeName + "_Value").Op("=").Lit(enumUnknownValue)
})
}
func astForEnumValuesFunction(typeName string, enumValues []*types.Field) *jen.Statement {
return jen.Commentf("%s_Values returns all known variants of %s.", typeName, typeName).
Line().
Func().
Id(typeName + "_Values").
Params().
Params(jen.Op("[]").Id(typeName + "_Value")).
Block(
jen.Return(jen.Op("[]").Id(typeName + "_Value").ValuesFunc(func(values *jen.Group) {
for _, valDef := range enumValues {
values.Id(typeName + "_" + valDef.Name)
}
})),
)
}
func astForEnumConstructor(typeName string) *jen.Statement {
return jen.Func().Id("New_" + typeName).Params(jen.Id("value").Id(typeName + "_Value")).Params(jen.Id(typeName)).Block(
jen.Return(jen.Id(typeName).Values(jen.Id(enumStructFieldName).Op(":").Id("value"))),
)
}
func astForEnumIsUnknown(typeName string, values []*types.Field) *jen.Statement {
return jen.Commentf("IsUnknown returns false for all known variants of %s and true otherwise.", typeName).
Line().
Func().
Params(jen.Id(enumReceiverName).Id(typeName)).Id("IsUnknown").Params().Params(jen.Bool()).BlockFunc(func(methodBody *jen.Group) {
if len(values) > 0 {
methodBody.Switch(jen.Id(enumReceiverName).Dot(enumStructFieldName)).Block(
jen.CaseFunc(func(conds *jen.Group) {
for _, valDef := range values {
conds.Id(typeName + "_" + valDef.Name)
}
}).Block(jen.Return(jen.False())))
}
methodBody.Return(jen.True())
})
}
func astForEnumValueMethod(typeName string) *jen.Statement {
return jen.Func().
Params(jen.Id(enumReceiverName).Id(typeName)).
Id("Value").
Params().
Params(jen.Id(typeName+"_Value")).
Block(
jen.If(jen.Id(enumReceiverName).Dot("IsUnknown").Call()).Block(
jen.Return(jen.Id(typeName+"_"+enumUnknownValue)),
),
jen.Return(jen.Id(enumReceiverName).Dot(enumStructFieldName)),
)
}
func astForEnumStringMethod(typeName string) *jen.Statement {
return snip.MethodString(enumReceiverName, typeName).Block(
jen.Return(jen.String().Call(jen.Id(enumReceiverName).Dot(enumStructFieldName))),
)
}
func astForEnumMarshalText(typeName string) *jen.Statement {
return snip.MethodMarshalText(enumReceiverName, typeName).Block(
jen.Return(jen.Id("[]byte").Call(jen.Id(enumReceiverName).Dot(enumStructFieldName)), jen.Nil()),
)
}
func astForEnumUnmarshalText(typeName string, values []*types.Field) *jen.Statement {
return snip.MethodUnmarshalText(enumReceiverName, typeName).Block(
jen.Switch(
jen.Id(enumUpperVarName).Op(":=").Add(snip.StringsToUpper()).Call(jen.String().Call(jen.Id(dataVarName))),
jen.Id(enumUpperVarName),
).BlockFunc(func(cases *jen.Group) {
assign := func(val jen.Code) *jen.Statement {
return jen.Op("*").Add(jen.Id(enumReceiverName)).Op("=").Id("New_" + typeName).Call(val)
}
cases.Default().Block(assign(jen.Id(typeName + "_Value").Call(jen.Id(enumUpperVarName))))
for _, valDef := range values {
cases.Case(jen.Lit(valDef.Name)).Block(assign(jen.Id(typeName + "_" + valDef.Name)))
}
}),
jen.Return(jen.Nil()),
)
}