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gomodel.go
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gomodel.go
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// Copyright The Athenz Authors
// Licensed under the terms of the Apache version 2.0 license. See LICENSE file for terms.
package main
import (
"bufio"
"fmt"
"os"
"os/exec"
"path/filepath"
"reflect"
"sort"
"strings"
genutil "github.com/ardielle/ardielle-go/gen"
"github.com/ardielle/ardielle-go/rdl"
)
type GeneratorParams struct {
Outdir string
Banner string
Namespace string
UntaggedUnions []string
LibRdl string
PrefixEnums bool
PreciseTypes bool
GenerateSchema bool
}
type modelGenerator struct {
registry rdl.TypeRegistry
schema *rdl.Schema
writer *bufio.Writer
librdl string
prefixEnums bool
precise bool
err error
untaggedUnions []string
ns string
rdl bool
}
// GenerateGoModel generates the model code for the types defined in the RDL schema.
func GenerateAthenzGoModel(schema *rdl.Schema, params *GeneratorParams) error {
name := strings.ToLower(string(schema.Name))
outdir := params.Outdir
if outdir == "" {
outdir = "."
name = name + "_model.go"
} else if strings.HasSuffix(outdir, ".go") {
name = filepath.Base(outdir)
outdir = filepath.Dir(outdir)
} else {
name = name + "_model.go"
}
err := os.MkdirAll(outdir, 0755)
if err != nil {
return err
}
filePath := outdir + "/" + name
out, file, _, err := genutil.OutputWriter(filePath, "", ".go")
if err != nil {
return err
}
if file != nil {
defer func() {
file.Close()
err := goFmt(filePath)
if err != nil {
fmt.Println("Warning: could not format go code:", err)
}
}()
}
gen := &modelGenerator{
registry: rdl.NewTypeRegistry(schema),
schema: schema,
writer: out,
librdl: params.LibRdl,
prefixEnums: params.PrefixEnums,
precise: params.PreciseTypes,
err: nil,
untaggedUnions: params.UntaggedUnions,
ns: params.Namespace,
rdl: schema.Name == "rdl",
}
gen.emitHeader(params.Banner)
if gen.err == nil {
for _, t := range schema.Types {
gen.emitType(t)
}
}
out.Flush()
if gen.err == nil {
if params.GenerateSchema {
gen.err = GenerateGoSchema(params.Banner, schema, outdir, params.Namespace, params.LibRdl, params.PrefixEnums)
}
}
return gen.err
}
func (gen *modelGenerator) isUntaggedUnion(s rdl.TypeName) bool {
ss := string(s)
for _, st := range gen.untaggedUnions {
if ss == st {
return true
}
}
return false
}
func (gen *modelGenerator) emit(s string) {
if gen.err == nil {
_, err := gen.writer.WriteString(s)
if err != nil {
gen.err = err
}
}
}
func (gen *modelGenerator) structHasFieldDefault(t *rdl.StructTypeDef) bool {
flds := genutil.FlattenedFields(gen.registry, gen.registry.FindType(t.Type))
flds = append(flds, t.Fields...)
for _, f := range flds {
if !f.Optional {
switch gen.registry.FindBaseType(f.Type) {
case rdl.BaseTypeArray, rdl.BaseTypeMap, rdl.BaseTypeStruct:
return true
}
}
if f.Default != nil {
switch gen.registry.FindBaseType(f.Type) {
case rdl.BaseTypeString, rdl.BaseTypeSymbol, rdl.BaseTypeUUID, rdl.BaseTypeTimestamp:
switch s := (f.Default).(type) {
case string:
if s != "" {
return true
}
}
case rdl.BaseTypeEnum:
switch s := (f.Default).(type) {
case string:
if s != "" {
return true
}
}
case rdl.BaseTypeInt8, rdl.BaseTypeInt16, rdl.BaseTypeInt32, rdl.BaseTypeInt64, rdl.BaseTypeFloat32, rdl.BaseTypeFloat64:
switch n := f.Default.(type) {
case float64:
if n != 0 {
return true
}
}
case rdl.BaseTypeBool:
switch b := f.Default.(type) {
case bool:
if b {
return true
}
}
}
}
}
return false
}
func (gen *modelGenerator) requiredImports(t *rdl.Type, imports map[string]string, visited map[rdl.TypeName]rdl.TypeName) {
tName, _, _ := rdl.TypeInfo(t)
if _, ok := visited[tName]; ok {
return
}
visited[tName] = tName
if strings.HasPrefix(string(tName), "rdl.") && !gen.rdl {
imports[gen.librdl] = "rdl"
}
b := gen.registry.BaseType(t)
switch b {
case rdl.BaseTypeTimestamp, rdl.BaseTypeUUID:
if !gen.rdl {
imports[gen.librdl] = "rdl"
}
case rdl.BaseTypeEnum:
imports["encoding/json"] = ""
imports["fmt"] = ""
break
case rdl.BaseTypeUnion:
imports["encoding/json"] = ""
imports["fmt"] = ""
break
case rdl.BaseTypeArray:
if t.ArrayTypeDef != nil {
gen.requiredImports(gen.registry.FindType(t.ArrayTypeDef.Items), imports, visited)
}
case rdl.BaseTypeMap:
if t.MapTypeDef != nil {
gen.requiredImports(gen.registry.FindType(t.MapTypeDef.Keys), imports, visited)
gen.requiredImports(gen.registry.FindType(t.MapTypeDef.Items), imports, visited)
}
case rdl.BaseTypeStruct:
if !gen.rdl {
imports[gen.librdl] = "rdl"
}
imports["encoding/json"] = ""
if t.StructTypeDef != nil && t.StructTypeDef.Fields != nil {
for _, f := range t.StructTypeDef.Fields {
if !f.Optional {
switch gen.registry.FindBaseType(f.Type) {
case rdl.BaseTypeString, rdl.BaseTypeArray, rdl.BaseTypeMap, rdl.BaseTypeStruct:
imports["fmt"] = ""
}
}
if f.Items != "" {
gen.requiredImports(gen.registry.FindType(f.Items), imports, visited)
} else if f.Keys != "" {
gen.requiredImports(gen.registry.FindType(f.Keys), imports, visited)
} else {
t := gen.registry.FindType(f.Type)
if t != nil {
gen.requiredImports(t, imports, visited)
}
}
}
}
}
}
func (gen *modelGenerator) emitHeader(banner string) {
imports := make(map[string]string, 0)
visited := make(map[rdl.TypeName]rdl.TypeName, 0)
for _, t := range gen.schema.Types {
gen.requiredImports(t, imports, visited)
}
gen.emit(GenerationHeader(banner))
gen.emit("\n\npackage " + GenerationPackage(gen.schema, gen.ns) + "\n")
if len(imports) > 0 {
rdlEmitted := false
jsonEmitted := false
fmtEmitted := false
var imp sort.StringSlice
for k := range imports {
if k == string(gen.schema.Name) {
continue
}
kk := fmt.Sprintf("%q", k)
if k == "fmt" {
fmtEmitted = true
} else if k == "encoding/json" {
jsonEmitted = true
}
n := imports[k]
if n != "" {
if n == "rdl" {
rdlEmitted = true
}
kk = n + " " + kk
}
imp = append(imp, kk)
}
imp.Sort()
gen.emit("\nimport (\n")
for _, k := range imp {
gen.emit("\t" + k + "\n")
}
gen.emit(")\n")
if rdlEmitted {
gen.emit("\nvar _ = rdl.Version\n")
}
if jsonEmitted {
if !rdlEmitted {
gen.emit("\n")
}
gen.emit("var _ = json.Marshal\n")
}
if fmtEmitted {
if !jsonEmitted && !rdlEmitted {
gen.emit("\n")
}
gen.emit("var _ = fmt.Printf\n")
}
}
}
func (gen *modelGenerator) emitTypeComment(t *rdl.Type) {
tName, _, tComment := rdl.TypeInfo(t)
s := string(tName) + " -"
if tComment != "" {
s += " " + tComment
}
gen.emit(formatComment(s, 0, 80))
}
func goType(reg rdl.TypeRegistry, rdlType rdl.TypeRef, optional bool, items rdl.TypeRef, keys rdl.TypeRef, precise bool, reference bool) string {
return goType2(reg, rdlType, optional, items, keys, precise, reference, "")
}
func goType2(reg rdl.TypeRegistry, rdlType rdl.TypeRef, optional bool, items rdl.TypeRef, keys rdl.TypeRef, precise bool, reference bool, packageName string) string {
rdlPrefix := "rdl."
if reg.Name() == "rdl" {
rdlPrefix = ""
}
cleanType := string(rdlType)
if !strings.HasPrefix(cleanType, "rdl.") {
cleanType = capitalize(strings.Replace(string(rdlType), ".", "_", -1))
}
prefix := ""
if optional {
prefix = "*"
}
t := reg.FindType(rdlType)
if t.Variant == 0 {
panic("Cannot find type '" + rdlType + "'")
}
lrdlType := strings.ToLower(string(rdlType))
if precise {
switch lrdlType {
case "string":
return "string"
case "symbol":
return rdlPrefix + "Symbol"
case "bool", "int32", "int64", "int16", "int8", "float64", "float32":
return prefix + strings.ToLower(cleanType)
default:
bt := reg.BaseType(t)
switch bt {
case rdl.BaseTypeString, rdl.BaseTypeSymbol:
return cleanType
case rdl.BaseTypeInt8, rdl.BaseTypeInt16, rdl.BaseTypeInt32, rdl.BaseTypeInt64, rdl.BaseTypeFloat32, rdl.BaseTypeFloat64, rdl.BaseTypeBool:
return prefix + cleanType
case rdl.BaseTypeTimestamp, rdl.BaseTypeUUID:
fullTypeName := rdlPrefix + cleanType
return prefix + fullTypeName
default:
if lrdlType == "struct" {
fullTypeName := rdlPrefix + cleanType
return prefix + fullTypeName
}
}
}
} else {
switch lrdlType {
case "timestamp":
return prefix + rdlPrefix + "Timestamp"
case "uuid":
return prefix + rdlPrefix + "UUID"
case "struct":
return prefix + rdlPrefix + "Struct"
}
}
bt := reg.BaseType(t)
switch bt {
case rdl.BaseTypeAny:
return "interface{}"
case rdl.BaseTypeString:
return "string"
case rdl.BaseTypeSymbol:
return rdlPrefix + "Symbol"
case rdl.BaseTypeBool:
return prefix + "bool"
case rdl.BaseTypeInt8, rdl.BaseTypeInt16, rdl.BaseTypeInt32, rdl.BaseTypeInt64, rdl.BaseTypeFloat32, rdl.BaseTypeFloat64:
return prefix + strings.ToLower(bt.String())
case rdl.BaseTypeArray:
if reference {
name := "Array"
if t.ArrayTypeDef != nil {
name = string(t.ArrayTypeDef.Name)
}
if name != "Array" {
return name
}
}
i := rdl.TypeRef("Any")
switch t.Variant {
case rdl.TypeVariantArrayTypeDef:
i = t.ArrayTypeDef.Items
default:
if items != "" {
i = items
}
}
gitems := goType2(reg, i, false, "", "", precise, reference, packageName)
return "[]" + gitems
case rdl.BaseTypeMap:
if reference {
//we check if we have defined a type, i.e. the type name is not "Map"
name := rdl.TypeName("Map")
if t.MapTypeDef != nil {
name = t.MapTypeDef.Name
} else if t.AliasTypeDef != nil {
name = t.AliasTypeDef.Name
}
if name != "Map" {
return string(name)
}
}
k := rdl.TypeRef("Any")
i := rdl.TypeRef("Any")
switch t.Variant {
case rdl.TypeVariantMapTypeDef:
k = t.MapTypeDef.Keys
i = t.MapTypeDef.Items
default:
if keys != "" {
k = keys
}
if items != "" {
i = items
}
}
gkeys := goType2(reg, k, false, "", "", precise, reference, packageName)
gitems := goType2(reg, i, false, "", "", precise, reference, packageName)
return "map[" + gkeys + "]" + gitems
case rdl.BaseTypeStruct:
switch t.Variant {
case rdl.TypeVariantAliasTypeDef:
if t.AliasTypeDef.Name == "Struct" {
return prefix + "map[string]interface{}"
}
}
if packageName != "" {
return "*" + packageName + "." + cleanType
}
return "*" + cleanType
case rdl.BaseTypeUnion:
return "*" + cleanType
case rdl.BaseTypeEnum:
return prefix + cleanType
case rdl.BaseTypeBytes:
return "[]byte"
default:
return prefix + cleanType
}
}
func (gen *modelGenerator) emitType(t *rdl.Type) {
if gen.err == nil {
tName, _, _ := rdl.TypeInfo(t)
if strings.HasPrefix(string(tName), "rdl.") {
return
}
tName = goTypeName(tName)
bt := gen.registry.BaseType(t)
switch bt {
case rdl.BaseTypeAny:
gen.emit("\n")
gen.emitTypeComment(t)
gen.emit(fmt.Sprintf("type %s interface{}\n", tName))
case rdl.BaseTypeString, rdl.BaseTypeBool, rdl.BaseTypeInt8, rdl.BaseTypeInt16, rdl.BaseTypeInt32, rdl.BaseTypeInt64, rdl.BaseTypeFloat32, rdl.BaseTypeFloat64, rdl.BaseTypeSymbol:
if gen.precise {
gen.emit("\n")
gen.emitTypeComment(t)
gen.emit(fmt.Sprintf("type %s %s\n", tName, goType(gen.registry, rdl.TypeRef(bt.String()), false, "", "", gen.precise, false)))
}
case rdl.BaseTypeStruct:
gen.emit("\n")
gen.emitStruct(t)
case rdl.BaseTypeUnion:
gen.emit("\n")
gen.emitUnion(t)
case rdl.BaseTypeArray:
gen.emit("\n")
gen.emitArray(t)
case rdl.BaseTypeMap:
gen.emit("\n")
gen.emitMap(t)
case rdl.BaseTypeEnum:
gen.emit("\n")
gen.emitTypeComment(t)
gen.emitEnum(t)
}
}
}
func goTypeName(name rdl.TypeName) rdl.TypeName {
tokens := strings.Split(string(name), ".")
return rdl.TypeName(capitalize(strings.Join(tokens, "_")))
}
func (gen *modelGenerator) emitUnion(t *rdl.Type) {
tName, _, _ := rdl.TypeInfo(t)
ut := t.UnionTypeDef
uName := capitalize(string(tName))
gen.emit(fmt.Sprintf("// %sVariantTag - generated to support %s\n", uName, uName))
gen.emit(fmt.Sprintf("type %sVariantTag int\n\n", uName))
gen.emit("// Supporting constants\n")
gen.emit("const (\n")
gen.emit(fmt.Sprintf("\t_ %sVariantTag = iota\n", uName))
for _, v := range ut.Variants {
uV := capitalize(string(v))
gen.emit(fmt.Sprintf("\t%sVariant%s\n", uName, uV))
}
gen.emit(")\n\n")
maxKeyLen := len("Variant")
for _, v := range ut.Variants {
if len(v) > maxKeyLen {
maxKeyLen = len(v)
}
}
gen.emitTypeComment(t)
gen.emit(fmt.Sprintf("type %s struct {\n", uName))
s := leftJustified("Variant", maxKeyLen)
vtag := uName + "VariantTag"
gen.emit(fmt.Sprintf("\t%s %s `json:\"-\" rdl:\"union\"`\n", s, vtag))
maxVarLen := maxKeyLen + 1
if len(vtag) > maxVarLen {
maxVarLen = len(vtag)
}
for _, v := range ut.Variants {
uV := capitalize(string(v))
vType := goType(gen.registry, v, true, "", "", gen.precise, true)
tag := fmt.Sprintf("`json:\"%s,omitempty\" yaml:\",omitempty\"`", v)
s := leftJustified(uV, maxKeyLen)
gen.emit(fmt.Sprintf("\t%s %s %s\n", s, leftJustified(vType, maxVarLen), tag))
}
gen.emit("}\n\n")
gen.emit(fmt.Sprintf("func (u %s) String() string {\n", uName))
gen.emit("\tswitch u.Variant {\n")
for _, v := range ut.Variants {
uV := capitalize(string(v))
gen.emit(fmt.Sprintf("\tcase %sVariant%s:\n", uName, uV))
gen.emit(fmt.Sprintf("\t\treturn fmt.Sprintf(\"%%v\", u.%s)\n", uV))
}
gen.emit("\tdefault:\n")
gen.emit(fmt.Sprintf("\t\treturn \"<%s uninitialized>\"\n", uName))
gen.emit("\t}\n")
gen.emit("}\n\n")
gen.emit(fmt.Sprintf("// Validate for %s\n", uName))
gen.emit(fmt.Sprintf("func (p *%s) Validate() error {\n", uName))
gen.emit("\t")
for _, v := range ut.Variants {
gen.emit(fmt.Sprintf("if p.%s != nil {\n\t\tp.Variant = %sVariant%s\n\t} else ", v, uName, v))
}
gen.emit(fmt.Sprintf("{\n\t\treturn fmt.Errorf(\"%s: Missing required variant\")\n\t}\n", uName))
gen.emit("\treturn nil\n")
gen.emit("}\n")
if gen.isUntaggedUnion(tName) {
gen.emitUntaggedUnionSerializer(ut, tName)
} else {
gen.emit(fmt.Sprintf("\ntype raw%s %s\n\n", uName, uName))
gen.emit(fmt.Sprintf("// UnmarshalJSON for %s\n", uName))
gen.emit(fmt.Sprintf("func (p *%s) UnmarshalJSON(b []byte) error {\n", uName))
gen.emit(fmt.Sprintf("\tvar tmp raw%s\n", uName))
gen.emit("\tif err := json.Unmarshal(b, &tmp); err != nil {\n")
gen.emit("\t\treturn err\n")
gen.emit("\t}\n")
gen.emit(fmt.Sprintf("\t*p = %s(tmp)\n", uName))
gen.emit("\treturn p.Validate()\n")
gen.emit("}\n")
}
}
func (gen *modelGenerator) emitUntaggedUnionSerializer(ut *rdl.UnionTypeDef, uName rdl.TypeName) {
gen.emit(fmt.Sprintf("\nfunc check%sStructFields(repr map[string]interface{}, fields map[string]bool) bool {\n", uName))
gen.emit("\tfor name, required := range fields {\n")
gen.emit("\t\tif _, present := repr[name]; required && !present {\n")
gen.emit("\t\t\treturn false\n")
gen.emit("\t\t}\n")
gen.emit("\t}\n")
gen.emit("\tfor name := range repr {\n")
gen.emit("\t\tif _, ok := fields[name]; !ok {\n")
gen.emit("\t\t\treturn false\n")
gen.emit("\t\t}\n")
gen.emit("\t}\n")
gen.emit("\treturn true\n")
gen.emit("}\n\n")
for _, v := range ut.Variants {
uV := capitalize(string(v))
t := gen.registry.FindType(v)
switch t.Variant {
case rdl.TypeVariantStructTypeDef:
names := ""
for _, f := range genutil.FlattenedFields(gen.registry, t) {
s := fmt.Sprintf("%q", f.Name)
if !f.Optional && f.Default == nil {
s = s + ": true"
} else {
s = s + ": false"
}
if names == "" {
names = s
} else {
names = names + ", " + s
}
}
if names != "" {
names = "map[string]bool{" + names + "}"
gen.emit(fmt.Sprintf("func make%sVariant%s(b []byte, u *%s, fields map[string]interface{}) bool {\n", uName, uV, uName))
gen.emit(fmt.Sprintf("\tif check%sStructFields(fields, %s) {\n", uName, names))
gen.emit(fmt.Sprintf("\t\tvar o %s\n", uV))
gen.emit("\t\tif err := json.Unmarshal(b, &o); err == nil {\n")
gen.emit(fmt.Sprintf("\t\t\tup := new(%s)\n", uName))
gen.emit(fmt.Sprintf("\t\t\tup.Variant = %sVariant%s\n", uName, uV))
gen.emit(fmt.Sprintf("\t\t\tup.%s = &o\n", uV))
gen.emit("\t\t\t*u = *up\n")
gen.emit("\t\t\treturn true\n")
gen.emit("\t\t}\n")
gen.emit("\t}\n")
gen.emit("\treturn false\n")
gen.emit("}\n\n")
}
default:
gen.err = fmt.Errorf("untagged union serializer only supported for struct type unions")
return
}
}
gen.emit(fmt.Sprintf("// UnmarshalJSON for %s\n", uName))
gen.emit(fmt.Sprintf("func (u *%s) UnmarshalJSON(b []byte) error {\n", uName))
gen.emit("\tvar tmp interface{}\n")
gen.emit("\tif err := json.Unmarshal(b, &tmp); err != nil {\n")
gen.emit("\t\treturn err\n")
gen.emit("\t}\n")
gen.emit("\tswitch v := tmp.(type) {\n")
gen.emit("\tcase map[string]interface{}:\n")
for _, v := range ut.Variants {
uV := capitalize(string(v))
gen.emit(fmt.Sprintf("\t\tif make%sVariant%s(b, u, v) {\n", uName, uV))
gen.emit("\t\t\treturn nil\n")
gen.emit("\t\t}\n")
}
gen.emit("\t}\n")
gen.emit(fmt.Sprintf("\treturn fmt.Errorf(\"Cannot unmarshal JSON to union type %s\")\n", uName))
gen.emit("}\n")
gen.emit(fmt.Sprintf("\n// MarshalJSON for %s\n", uName))
gen.emit(fmt.Sprintf("func (p %s) MarshalJSON() ([]byte, error) {\n", uName))
gen.emit("\tswitch p.Variant {\n")
for _, v := range ut.Variants {
uV := capitalize(string(v))
gen.emit(fmt.Sprintf("\tcase %sVariant%s:\n", uName, uV))
gen.emit(fmt.Sprintf("\t\treturn json.Marshal(p.%s)\n", uV))
}
gen.emit("\t}\n")
gen.emit(fmt.Sprintf("\treturn nil, fmt.Errorf(\"Cannot marshal uninitialized %s\")\n", uName))
gen.emit("}\n")
}
func (gen *modelGenerator) literal(lit interface{}) string {
switch v := lit.(type) {
case string:
return fmt.Sprintf("%q", v)
case int32:
return fmt.Sprintf("%d", v)
case int16:
return fmt.Sprintf("%d", v)
case int8:
return fmt.Sprintf("%d", v)
case int64:
return fmt.Sprintf("%d", v)
case float64:
return fmt.Sprintf("%g", v)
case float32:
return fmt.Sprintf("%g", v)
default: //bool, enum
return fmt.Sprintf("%v", lit)
}
}
func (gen *modelGenerator) emitArray(t *rdl.Type) {
if gen.err == nil {
switch t.Variant {
case rdl.TypeVariantArrayTypeDef:
at := t.ArrayTypeDef
gen.emitTypeComment(t)
ftype := goType(gen.registry, at.Type, false, at.Items, "", gen.precise, false)
gen.emit(fmt.Sprintf("type %s %s\n\n", at.Name, ftype))
default:
tName, tType, _ := rdl.TypeInfo(t)
gtype := goType(gen.registry, tType, false, "", "", gen.precise, false)
gen.emitTypeComment(t)
gen.emit(fmt.Sprintf("type %s %s\n\n", tName, gtype))
}
}
}
func (gen *modelGenerator) emitMap(t *rdl.Type) {
if gen.err == nil {
switch t.Variant {
case rdl.TypeVariantMapTypeDef:
mt := t.MapTypeDef
gen.emitTypeComment(t)
ftype := goType(gen.registry, mt.Type, false, mt.Items, mt.Keys, gen.precise, false)
gen.emit(fmt.Sprintf("type %s %s\n\n", mt.Name, ftype))
default:
tName, tType, _ := rdl.TypeInfo(t)
gtype := goType(gen.registry, tType, false, "string", "", gen.precise, false)
gen.emitTypeComment(t)
gen.emit(fmt.Sprintf("type %s %s\n\n", tName, gtype))
}
}
}
func (gen *modelGenerator) emitStruct(t *rdl.Type) {
if gen.err == nil {
switch t.Variant {
case rdl.TypeVariantStructTypeDef:
st := t.StructTypeDef
flattened := genutil.FlattenedFields(gen.registry, t)
gen.emitTypeComment(t)
gen.emitStructFields(flattened, st.Name)
init := gen.structHasFieldDefault(st)
gen.emit(fmt.Sprintf("\n// New%s - creates an initialized %s instance, returns a pointer to it\n", st.Name, st.Name))
gen.emit(fmt.Sprintf("func New%s(init ...*%s) *%s {\n", st.Name, st.Name, st.Name))
gen.emit(fmt.Sprintf("\tvar o *%s\n", st.Name))
gen.emit("\tif len(init) == 1 {\n")
gen.emit("\t\to = init[0]\n")
gen.emit("\t} else {\n")
gen.emit(fmt.Sprintf("\t\to = new(%s)\n", st.Name))
gen.emit("\t}\n")
if init {
gen.emit("\treturn o.Init()\n")
} else {
gen.emit(fmt.Sprintf("\treturn o\n"))
}
gen.emit("}\n")
if init {
gen.emitStructInitializer(st, flattened)
}
gen.emitStructUnmarshaller(st, init)
gen.emitStructValidator(st, flattened)
case rdl.TypeVariantAliasTypeDef:
gen.emitTypeComment(t)
gen.emit(fmt.Sprintf("type %s rdl.Struct\n\n", t.AliasTypeDef.Name))
default:
panic(fmt.Sprintf("Unreasonable struct typedef: %v", t.Variant))
}
}
}
func (gen *modelGenerator) emitStructValidator(st *rdl.StructTypeDef, flattened []*rdl.StructFieldDef) {
gen.emit("\n// Validate - checks for missing required fields, etc\n")
gen.emit(fmt.Sprintf("func (self *%s) Validate() error {\n", st.Name))
rdlPrefix := "rdl."
if gen.rdl {
rdlPrefix = ""
}
for _, f := range flattened {
fname := capitalize(string(f.Name))
ftype := string(f.Type)
bt := gen.registry.FindBaseType(f.Type)
switch bt {
case rdl.BaseTypeString, rdl.BaseTypeSymbol:
if !f.Optional {
gen.emit(fmt.Sprintf("\tif self.%s == \"\" {\n", fname))
gen.emit(fmt.Sprintf("\t\treturn fmt.Errorf(\"%s.%s is missing but is a required field\")\n", st.Name, f.Name))
}
if bt == rdl.BaseTypeString && fname != "String" {
if !f.Optional {
gen.emit("\t} else {\n")
} else {
gen.emit(fmt.Sprintf("\tif self.%s != \"\" {\n", fname))
}
gen.emit(fmt.Sprintf("\t\tval := %sValidate(%sSchema(), %q, self.%s)\n\t\tif !val.Valid {\n\t\t\treturn fmt.Errorf(\"%s.%s does not contain a valid %s (%%v)\", val.Error)\n\t\t}\n", rdlPrefix, capitalize(string(gen.schema.Name)), ftype, fname, st.Name, string(f.Name), ftype))
}
gen.emit("\t}\n")
case rdl.BaseTypeTimestamp:
if !f.Optional {
gen.emit(fmt.Sprintf("\tif self.%s.IsZero() {\n", fname))
gen.emit(fmt.Sprintf("\t\treturn fmt.Errorf(\"%s: Missing required field: %s\")\n", st.Name, f.Name))
gen.emit("\t}\n")
}
case rdl.BaseTypeArray, rdl.BaseTypeMap, rdl.BaseTypeStruct, rdl.BaseTypeUUID:
if !f.Optional {
gen.emit(fmt.Sprintf("\tif self.%s == nil {\n", fname))
gen.emit(fmt.Sprintf("\t\treturn fmt.Errorf(\"%s: Missing required field: %s\")\n", st.Name, f.Name))
gen.emit("\t}\n")
}
}
}
gen.emit("\treturn nil\n")
gen.emit("}\n")
}
func (gen *modelGenerator) emitStructInitializer(st *rdl.StructTypeDef, flattened []*rdl.StructFieldDef) {
gen.emit("\n// Init - sets up the instance according to its default field values, if any\n")
gen.emit(fmt.Sprintf("func (self *%s) Init() *%s {\n", st.Name, st.Name))
for _, f := range flattened {
fname := capitalize(string(f.Name))
isRdl := false
ftype := string(f.Type)
if strings.HasPrefix(ftype, "rdl.") {
isRdl = true
ftype = capitalize(ftype[4:])
}
if !f.Optional {
switch gen.registry.FindBaseType(f.Type) {
case rdl.BaseTypeArray:
ftype := goType(gen.registry, f.Type, false, f.Items, f.Keys, gen.precise, true)
gen.emit(fmt.Sprintf("\tif self.%s == nil {\n", fname))
gen.emit(fmt.Sprintf("\t\tself.%s = make(%s, 0)\n", fname, ftype))
gen.emit("\t}\n")
case rdl.BaseTypeMap:
ftype := goType(gen.registry, f.Type, false, f.Items, f.Keys, gen.precise, true)
gen.emit(fmt.Sprintf("\tif self.%s == nil {\n", fname))
gen.emit(fmt.Sprintf("\t\tself.%s = make(%s)\n", fname, ftype))
gen.emit("\t}\n")
case rdl.BaseTypeStruct:
gen.emit(fmt.Sprintf("\tif self.%s == nil {\n", fname))
if f.Type == "Struct" {
gen.emit(fmt.Sprintf("\t\tself.%s = make(rdl."+ftype+")\n", fname))
} else if isRdl {
gen.emit(fmt.Sprintf("\t\tself.%s = rdl.New%s()\n", fname, capitalize(ftype)))
} else {
gen.emit(fmt.Sprintf("\t\tself.%s = New%s()\n", fname, capitalize(ftype)))
}
gen.emit("\t}\n")
}
}
if f.Default != nil {
fdef := "nil" //the value present when not set
ndef := "nil" //the actual value to assign, if not already a zero value
pointerForOptional := true
switch gen.registry.FindBaseType(f.Type) {
case rdl.BaseTypeString, rdl.BaseTypeSymbol, rdl.BaseTypeUUID, rdl.BaseTypeTimestamp:
fdef = "\"\""
ndef = gen.literal(f.Default)
pointerForOptional = false
case rdl.BaseTypeInt8, rdl.BaseTypeInt16, rdl.BaseTypeInt32, rdl.BaseTypeInt64, rdl.BaseTypeFloat32, rdl.BaseTypeFloat64:
fdef = "0"
ndef = gen.literal(f.Default)
case rdl.BaseTypeBool:
ndef = gen.literal(f.Default)
if !f.Optional {
fdef = "false"
}
case rdl.BaseTypeEnum:
fdef = "0"
ndef = gen.literal(f.Default)
if gen.prefixEnums {
ndef = genutil.SnakeToCamel(ndef) //go conventions, should do this even without prefixEnums. Test here first.
ndef = capitalize(ftype) + ndef
}
}
if fdef != ndef {
//if f.Optional && fdef == "nil" {
if f.Optional && pointerForOptional {
gen.emit(fmt.Sprintf("\tif self.%s == nil {\n", fname))
gen.emit(fmt.Sprintf("\t\td := %s\n", ndef))
gen.emit(fmt.Sprintf("\t\tself.%s = &d\n", fname))
} else {
gen.emit(fmt.Sprintf("\tif self.%s == %s {\n", fname, fdef))
gen.emit(fmt.Sprintf("\t\tself.%s = %s\n", fname, ndef))
}
gen.emit("\t}\n")
}
}
}
gen.emit("\treturn self\n")
gen.emit("}\n")
}
func (gen *modelGenerator) emitStructUnmarshaller(st *rdl.StructTypeDef, init bool) {
name := capitalize(string(st.Name))
gen.emit(fmt.Sprintf("\ntype raw%s %s\n\n", name, name))
gen.emit(fmt.Sprintf("// UnmarshalJSON is defined for proper JSON decoding of a %s\n", name))
gen.emit(fmt.Sprintf("func (self *%s) UnmarshalJSON(b []byte) error {\n", name))
gen.emit(fmt.Sprintf("\tvar m raw%s\n", name))
gen.emit("\terr := json.Unmarshal(b, &m)\n")
gen.emit("\tif err == nil {\n")
gen.emit(fmt.Sprintf("\t\to := %s(m)\n", name))
if init {
gen.emit(fmt.Sprintf("\t\t*self = *((&o).Init())\n"))
} else {
gen.emit(fmt.Sprintf("\t\t*self = o\n"))
}
gen.emit(fmt.Sprintf("\t\terr = self.Validate()\n"))
gen.emit("\t}\n")
gen.emit("\treturn err\n")
gen.emit("}\n")
}
func (gen *modelGenerator) emitEnum(t *rdl.Type) {
if gen.err != nil {
return
}
et := t.EnumTypeDef
name := capitalize(string(et.Name))
gen.emit(fmt.Sprintf("type %s int\n\n", name))
gen.emit(fmt.Sprintf("// %s constants\n", name))
gen.emit("const (\n")
gen.emit(fmt.Sprintf("\t_ %s = iota\n", name))
maxKeyLen := 0
for _, elem := range et.Elements {
sym := string(elem.Symbol)
if gen.prefixEnums {
sym = genutil.SnakeToCamel(sym) //go conventions, should do this even without prefixEnums. Test here first.
sym = name + sym
}
if len(sym) > maxKeyLen {
maxKeyLen = len(sym)
}
gen.emit(fmt.Sprintf("\t%s\n", sym))
}
gen.emit(")\n\n")
gen.emit(fmt.Sprintf("var names%s = []string{\n", name))
for _, elem := range et.Elements {
symName := elem.Symbol
sym := string(symName)
if gen.prefixEnums {
sym = genutil.SnakeToCamel(sym) //go conventions, should do this even without prefixEnums. Test here first.
sym = name + sym
}
s := leftJustified(sym+":", maxKeyLen+1)
gen.emit(fmt.Sprintf("\t%s %q,\n", s, symName))
}
gen.emit("}\n\n")
gen.emit(fmt.Sprintf("// New%s - return a string representation of the enum\n", name))
gen.emit(fmt.Sprintf("func New%s(init ...interface{}) %s {\n", name, name))
gen.emit("\tif len(init) == 1 {\n")
gen.emit("\t\tswitch v := init[0].(type) {\n")
gen.emit(fmt.Sprintf("\t\tcase %s:\n", name))
gen.emit("\t\t\treturn v\n")
gen.emit("\t\tcase int:\n")
gen.emit(fmt.Sprintf("\t\t\treturn %s(v)\n", name))
gen.emit("\t\tcase int32:\n")
gen.emit(fmt.Sprintf("\t\t\treturn %s(v)\n", name))
gen.emit("\t\tcase string:\n")
gen.emit(fmt.Sprintf("\t\t\tfor i, s := range names%s {\n", name))
gen.emit("\t\t\t\tif s == v {\n")
gen.emit(fmt.Sprintf("\t\t\t\t\treturn %s(i)\n", name))
gen.emit("\t\t\t\t}\n")
gen.emit("\t\t\t}\n")
gen.emit("\t\tdefault:\n")
gen.emit(fmt.Sprintf("\t\t\tpanic(\"Bad init value for %s enum\")\n", name))
gen.emit("\t\t}\n")
gen.emit("\t}\n")
gen.emit(fmt.Sprintf("\treturn %s(0) //default to the first enum value\n", name))
gen.emit("}\n\n")
gen.emit("// String - return a string representation of the enum\n")
gen.emit(fmt.Sprintf("func (e %s) String() string {\n", name))
gen.emit(fmt.Sprintf("\treturn names%s[e]\n", name))
gen.emit("}\n\n")
gen.emit("// SymbolSet - return an array of all valid string representations (symbols) of the enum\n")
gen.emit(fmt.Sprintf("func (e %s) SymbolSet() []string {\n", name))
gen.emit(fmt.Sprintf("\treturn names%s\n", name))
gen.emit("}\n\n")
gen.emit(fmt.Sprintf("// MarshalJSON is defined for proper JSON encoding of a %s\n", name))
gen.emit(fmt.Sprintf("func (e %s) MarshalJSON() ([]byte, error) {\n", name))
gen.emit("\treturn json.Marshal(e.String())\n")
gen.emit("}\n\n")
gen.emit(fmt.Sprintf("// UnmarshalJSON is defined for proper JSON decoding of a %s\n", name))
gen.emit(fmt.Sprintf("func (e *%s) UnmarshalJSON(b []byte) error {\n", name))
gen.emit("\tvar j string\n")
gen.emit("\terr := json.Unmarshal(b, &j)\n")
gen.emit("\tif err == nil {\n")
gen.emit("\t\ts := string(j)\n")
gen.emit(fmt.Sprintf("\t\tfor v, s2 := range names%s {\n", name))
gen.emit("\t\t\tif s == s2 {\n")
gen.emit(fmt.Sprintf("\t\t\t\t*e = %s(v)\n", name))
gen.emit("\t\t\t\treturn nil\n")
gen.emit("\t\t\t}\n")
gen.emit("\t\t}\n")
gen.emit(fmt.Sprintf("\t\terr = fmt.Errorf(\"Bad enum symbol for type %s: %%s\", s)\n", name))
gen.emit("\t}\n")
gen.emit("\treturn err\n")
gen.emit("}\n")
}
func (gen *modelGenerator) emitStructFields(fields []*rdl.StructFieldDef, name rdl.TypeName) {
gen.emit(fmt.Sprintf("type %s struct {\n", name))
if fields != nil {
fnames := make([]string, 0, len(fields))
ftypes := make([]string, 0, len(fields))
nameWidth := 0
typeWidth := 0
hasComment := false
for _, f := range fields {
fname := capitalize(string(f.Name))
fnames = append(fnames, fname)
flen := len(fname)
if flen > nameWidth {
nameWidth = flen
}
optional := f.Optional
ftype := goType(gen.registry, f.Type, optional, f.Items, f.Keys, gen.precise, true)
ftypes = append(ftypes, ftype)
tlen := len(ftype)
if tlen > typeWidth {
typeWidth = tlen
}
if f.Comment != "" {
hasComment = true
}
}
i := 0
for _, f := range fields {
fname := fnames[i]
ftype := ftypes[i]
if !hasComment {
fname = leftJustified(fname, nameWidth+1)
ftype = leftJustified(ftype, typeWidth+1)
} else {
fname = fname + " "
ftype = ftype + " "
}