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set.go
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set.go
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package main
import (
"errors"
"fmt"
"go/ast"
"path/filepath"
)
// setGenerator generator will search for `// gen:Set` comments for custom types
// and generate all necessary code to this type.
//
// Requirements:
// * Custom type should be a struct with exactly two fields: "data" anf "order";
// * Field "data" should be a map[T]struct{};
// * Field "order" should be a slice of map keys;
// * Field "mx" should a sync.RWMutex.
//
// Known limitations:
// * Unfortunately "omitempty" tag won't work as expected for set, so you should
// add specific code for marshaling.
type setGenerator struct {
byCommentGenerator
}
var _ generator = setGenerator{}
func newSetGenerator() setGenerator {
g := setGenerator{}
g.byCommentGenerator = newByCommentGenerator(
"gen:Set",
func(pkgName, path string, spec *ast.TypeSpec, _ map[string]string) error {
strct, ok := spec.Type.(*ast.StructType)
if !ok {
return nil
}
if strct.Fields.NumFields() != 3 {
//goland:noinspection GoErrorStringFormat
return errors.New(`Set should have exactly three fields: "data", "order", and "mutex"`)
}
var (
dataField *ast.Field
orderField *ast.Field
mutexField *ast.Field
)
for _, f := range strct.Fields.List {
switch f.Names[0].Name {
case dataPropertyName:
dataField = f
case orderPropertyName:
orderField = f
case mutexPropertyName:
mutexField = f
}
}
s := set{
PkgName: pkgName,
Name: spec.Name.Name,
}
if err := g.checkMutexField(mutexField); err != nil {
return err
}
if err := g.collectSet(dataField, orderField, &s); err != nil {
return err
}
if err := g.generateCode(s, filepath.Dir(path)); err != nil {
return fmt.Errorf("failed to generate code for type %q: %w", s.Name, err)
}
return nil
},
)
return g
}
func (setGenerator) checkMutexField(f *ast.Field) error {
if f == nil {
return errors.New(`"mutex" field didn't present'`)
}
se, ok := f.Type.(*ast.SelectorExpr)
if !ok {
return errors.New(`"mutex" field should be *sync.RWMutex`)
}
if x, ok := se.X.(*ast.Ident); !ok || x.Name != "sync" || se.Sel.Name != "RWMutex" {
return errors.New(`"mutex" field should be *sync.RWMutex`)
}
return nil
}
type set struct {
PkgName string
Name string
Type string
}
func (setGenerator) Name() string { return "Set" }
func (setGenerator) collectSet(data, order *ast.Field, s *set) error {
mapType, ok := data.Type.(*ast.MapType)
if !ok {
return errors.New(`"data" field should be a map`)
}
var err error
s.Type, err = typeToString(mapType.Key)
if err != nil {
return fmt.Errorf(`failed to get "data" map key type: %w`, err)
}
valueType, err := typeToString(mapType.Value)
if err != nil {
return fmt.Errorf(`failed to get "data" map value type: %w`, err)
}
if valueType != "struct{}" {
return errors.New(`"data" map should have "struct{}" value type`)
}
slice, ok := order.Type.(*ast.ArrayType)
if !ok {
return errors.New(`"order" field should be a slice`)
}
sliceType, err := typeToString(slice.Elt)
if err != nil {
return fmt.Errorf(`failed to get "order" slice item type: %w`, err)
}
if sliceType != s.Type {
return fmt.Errorf(
`"order" slice item type %q isn't equal to %q`,
sliceType,
s.Type,
)
}
return nil
}
func (setGenerator) generateCode(s set, dirPath string) error {
const tmpl = `// Autogenerated code!
// DO NOT EDIT!
//
// Generated by Set generator from the internal/cmd/generator command.
package {{ .PkgName }}
func New{{ .Name }}(vv ...{{ .Type }}) *{{ .Name }} {
data := make(map[{{ .Type }}]struct{}, len(vv))
for _, v := range vv {
data[v] = struct{}{}
}
return &{{ .Name }}{
data: data,
order: vv,
}
}
// Add adds specific value to set.
func (m *{{ .Name }}) Add(v {{ .Type }}) {
m.mx.Lock()
defer m.mx.Unlock()
if m.data == nil {
m.data = map[{{ .Type }}]struct{}{}
}
if !m.has(v) {
m.order = append(m.order, v)
}
m.data[v] = struct{}{}
}
// Has checks that specified value is exists.
func (m *{{ .Name }}) Has(v {{ .Type }}) bool {
m.mx.RLock()
defer m.mx.RUnlock()
return m.has(v)
}
func (m *{{ .Name }}) has(v {{ .Type }}) bool {
_, ok := m.data[v]
return ok
}
// Len returns len of set.
func (m *{{ .Name }}) Len() int {
m.mx.RLock()
defer m.mx.RUnlock()
return len(m.data)
}
// Data return set's data.
func (m *{{ .Name }}) Data() []{{ .Type }} {
m.mx.RLock()
defer m.mx.RUnlock()
return m.order
}
`
path := filepath.Join(dirPath, camelCaseToUnderscore(s.Name)+"_gen.go")
return renderTemplateToFile(tmpl, path, s)
}