/
functions.go
135 lines (120 loc) · 3.68 KB
/
functions.go
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package mwire
import (
"fmt"
"github.com/gomelon/meta"
"go/types"
"golang.org/x/tools/go/packages"
"sort"
"text/template"
)
type functions struct {
pkgParser *meta.PkgParser
metaParser *meta.Parser
pkg *packages.Package
pkgPath string
}
func NewFunctions(gen *meta.TmplPkgGen) *functions {
return &functions{
pkg: gen.PkgParser().Package(gen.PkgPath()),
pkgPath: gen.PkgPath(),
pkgParser: gen.PkgParser(),
metaParser: gen.MetaParser(),
}
}
func (f *functions) FuncMap() template.FuncMap {
return map[string]any{
"parseWire": f.ParseWire,
}
}
type ParsedWireResult struct {
Providers []types.Object
Bindings []*ProviderHolder
}
func (r *ParsedWireResult) HasProvider() bool {
return len(r.Providers) > 0
}
type ProviderHolder struct {
Provider types.Object
ProviderType types.Type
InjectedIface types.Type
Order int32
IsBase bool
}
//ParseWire
//1. 获取所有ProviderFunc
//2. 获取ProviderType
//3. 获取ProviderTypeInterface
//4. 按ProviderTypeInterface分组
//5. 按order给各分组排序
//6. 模版输出
func (f *functions) ParseWire() (result *ParsedWireResult, err error) {
result = &ParsedWireResult{}
pkgFunctions := f.pkgParser.Functions(f.pkgPath)
if len(pkgFunctions) == 0 {
return
}
result.Providers = f.metaParser.FilterByMeta(MetaWireProvider, pkgFunctions)
providerTypeIfaceToProviders := map[types.Type][]types.Object{}
for _, function := range result.Providers {
providerObj := f.pkgParser.FirstResult(function)
if providerObj == nil {
err = fmt.Errorf("provider function expect has one result but none,function=%s", function.String())
return
}
providerType := providerObj.(*types.Var).Type()
providerInterfaces := f.pkgParser.AnonymousAssignTo(providerType)
if len(providerInterfaces) == 0 {
continue
}
for _, iface := range providerInterfaces {
providerTypeIfaceToProviders[iface] = append(providerTypeIfaceToProviders[iface], function)
}
firstParam := f.pkgParser.FirstParam(function)
if firstParam == nil {
continue
}
}
for providerTypeIface, itfProviders := range providerTypeIfaceToProviders {
itfProviderHolders := make([]*ProviderHolder, 0, len(itfProviders))
for _, provider := range itfProviders {
providerObject := f.pkgParser.FirstResult(provider)
params := f.pkgParser.Params(provider)
needInjectParam := false
for _, param := range params {
if !f.pkgParser.AssignableTo(param.Type(), providerTypeIface) {
continue
}
needInjectParam = true
wireMeta := f.metaParser.ObjectMetaGroup(provider, MetaWireProvider)[0]
providerHolder := &ProviderHolder{
Provider: provider,
ProviderType: providerObject.Type(),
InjectedIface: param.Type(),
Order: Order(wireMeta),
}
itfProviderHolders = append(itfProviderHolders, providerHolder)
}
if !needInjectParam {
providerHolder := &ProviderHolder{
Provider: provider,
ProviderType: providerObject.Type(),
InjectedIface: providerTypeIface,
IsBase: true,
}
itfProviderHolders = append(itfProviderHolders, providerHolder)
}
}
sort.Slice(itfProviderHolders, func(i, j int) bool {
return itfProviderHolders[i].IsBase ||
!itfProviderHolders[j].IsBase &&
(itfProviderHolders[i].Order > itfProviderHolders[j].Order ||
itfProviderHolders[i].Provider.Name() > itfProviderHolders[j].Provider.Name())
})
for i, size := 0, len(itfProviderHolders); i < size-1; i++ {
itfProviderHolders[i].InjectedIface, itfProviderHolders[i+1].InjectedIface =
itfProviderHolders[i+1].InjectedIface, itfProviderHolders[i].InjectedIface
}
result.Bindings = append(result.Bindings, itfProviderHolders...)
}
return
}