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varDecl.go
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/
varDecl.go
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package main
import (
"context"
"fmt"
"github.com/dave/jennifer/jen"
"go/ast"
"log"
"strings"
"sync"
)
type Delayed interface {
Do(ctx context.Context, target *ast.TypeSpec, targetMethods []ast.Node, cfg Config)
}
type variableDecl struct {
instance *jen.Statement
target *ast.TypeSpec
Config
vType
resolved []string
rootResolver Resolver
processMut sync.Mutex
generics map[struct {
Pkg, Target string
}]resolveMap
}
func (v *variableDecl) Declare() *jen.Statement {
return v.instance
}
func (v *variableDecl) Do(ctx context.Context, target *ast.TypeSpec, targetMethods []ast.Node, cfg Config) {
v.processMut.Lock()
defer v.processMut.Unlock()
if v.vType == Auto && cfg.Target == v.Target {
v.vType = v.updateVType(target, targetMethods)
}
if target != nil {
if cfg.Target == v.Target {
v.target = target
}
if len(v.resolved) > 0 {
if target.TypeParams == nil || target.TypeParams.List == nil {
if target.Name.Name == v.Target {
critical("target not a generic type")
}
} else {
rslMap := resolveMap{resolve: map[string]string{}, index: []string{}}
total := 0
for i := range target.TypeParams.List {
for _, ident := range target.TypeParams.List[i].Names {
rslMap.index = append(rslMap.index, ident.Name)
total++
}
}
v.generics[struct{ Pkg, Target string }{Pkg: cfg.Package, Target: cfg.Target}] = rslMap
}
}
}
}
func (v *variableDecl) CompleteResolve() {
v.update()
wait := &sync.WaitGroup{}
wait.Add(1)
if len(v.resolved) > 0 {
genericsRoot := v.generics[struct{ Pkg, Target string }{Pkg: v.Package, Target: v.Target}]
if len(genericsRoot.index) != len(v.resolved) {
critical(fmt.Sprintf("%s target generics count mismatch %d:%d", v.Target, len(genericsRoot.index), len(v.resolved)))
}
for i := range genericsRoot.index {
genericsRoot.resolve[genericsRoot.index[i]] = v.resolved[i]
}
}
go v.rootResolver.CompleteResolve(v.generics[struct{ Pkg, Target string }{Pkg: v.Package, Target: v.Target}], v.generics, wait) //todo only if need
wait.Wait()
}
func (v *variableDecl) updateVType(target *ast.TypeSpec, targetMethods []ast.Node) vType {
//auto
if target != nil {
switch target.Type.(type) {
case *ast.InterfaceType:
return Real
case *ast.MapType:
return Real
case *ast.ArrayType:
return Real
case *ast.SliceExpr:
return Real
}
}
var resolveVType func(exp ast.Expr) vType
resolveVType = func(exp ast.Expr) vType {
switch newT := exp.(type) {
case *ast.StarExpr: //mb [T]
return Ref
case *ast.Ident:
return Real
case *ast.IndexListExpr:
return resolveVType(newT.X)
default:
log.Println("wrong declaration attempt")
}
return Auto
}
for i := range targetMethods {
switch method := targetMethods[i].(type) {
case *ast.FuncDecl:
if method.Name.IsExported() {
if rsl := resolveVType(method.Recv.List[0].Type); rsl != Auto {
return rsl
}
}
}
}
return Auto
}
func (v *variableDecl) update() {
resetStatement(v.instance)
switch v.vType {
case Real:
v.instance.Id(v.Variable).Qual(v.Package, v.Target)
case Ref:
v.instance.Id(v.Variable).Op("*").Qual(v.Package, v.Target)
default:
v.instance.Id(v.Variable).Op("*").Qual(v.Package, v.Target)
}
if len(v.resolved) > 0 {
v.instance.TypesFunc(func(group *jen.Group) {
for _, resolve := range v.resolved {
var (
statement *jen.Statement = &jen.Statement{}
)
if strings.Index(resolve, "*") == 0 {
statement.Op("*")
if len(resolve) > 1 {
resolve = strings.TrimSpace(resolve[1:]) //drop symbol *
}
}
if strings.Contains(resolve, ".") {
qual := strings.Split(resolve, ".")
if len(qual) == 2 {
qual[0], qual[1] = strings.TrimSpace(qual[0]), strings.TrimSpace(qual[1])
group.Add(statement.Qual(qual[0], qual[1]))
} else {
critical(fmt.Sprintf("WARNING: probably incorrect generic resolve %s", resolve))
group.Add(statement.Id(resolve))
}
} else {
group.Add(statement.Id(resolve))
}
}
})
} else {
//log.Println("empty resolver")
}
}
func newVariableDecl(cfg Config, vType vType, resolved []string) *variableDecl {
return &variableDecl{
instance: &jen.Statement{},
Config: cfg,
vType: vType,
resolved: resolved,
generics: map[struct{ Pkg, Target string }]resolveMap{},
rootResolver: newResolver(),
}
}
func newVariableDeclFromConfig(cfg Config) *variableDecl {
//log.Println(cfg.Variable)
generics := resolveGenerics2(cfg)
if strings.Index(cfg.Variable, "*") == 0 {
cfg.Variable = clearVarDeclaration(cfg.Variable)
return newVariableDecl(cfg, Real, generics)
} else if strings.Index(cfg.Variable, "&") == 0 {
cfg.Variable = clearVarDeclaration(cfg.Variable)
return newVariableDecl(cfg, Ref, generics)
} else {
//auto
cfg.Variable = clearVarDeclaration(cfg.Variable)
return newVariableDecl(cfg, Auto, generics)
}
}
// todo refactor
func resolveGenerics2(cfg Config) []string {
start, end := strings.Index(cfg.Variable, "["), strings.Index(cfg.Variable, "]")
if start < 0 || end < 0 || end-start <= 1 {
return []string{}
}
result := strings.Split(cfg.Variable[start+1:end], ",")
for i := range result {
result[i] = strings.Replace(strings.TrimSpace(result[i]), "&", "*", 1)
}
return result
}