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loader.go
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loader.go
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package loader
import (
"fmt"
"go/types"
)
func NewDeclProvider() *declProvider {
return &declProvider{
mapping: make(map[TypeDecl]bool),
scopeMapping: make(map[string]*types.Scope),
}
}
func (d *declProvider) TryGetMock(wd string, typeDecl *TypeDecl) ([]*MethodDecl, bool) {
if _, ok := d.mapping[*typeDecl]; ok {
return nil, false
} else if scope, ok := d.getPackageScope(wd, typeDecl); !ok {
return nil, false
} else if typeObj := scope.Lookup(typeDecl.typeName); typeObj == nil {
fmt.Printf("cannot find a type %s\n", typeDecl.typeName)
return nil, false
} else if interfaceTypeObj, ok := typeObj.Type().Underlying().(*types.Interface); !ok {
fmt.Printf("type %s is not an interface\n", typeDecl.typeName)
return nil, true
} else {
funcs := make([]*MethodDecl, interfaceTypeObj.NumMethods())
for i := 0; i < interfaceTypeObj.NumMethods(); i++ {
if signature, ok := interfaceTypeObj.Method(i).Type().(*types.Signature); !ok {
fmt.Println("function type is not a signature")
return nil, false
} else {
funcs[i] = &MethodDecl{
name: interfaceTypeObj.Method(i).Name(),
params: getParams(signature),
returns: getReturns(signature),
}
}
}
d.mapping[*typeDecl] = true
return funcs, true
}
}
func (d *declProvider) getPackageScope(wd string, typeDecl *TypeDecl) (*types.Scope, bool) {
var scope *types.Scope
var ok bool
if scope, ok = d.scopeMapping[typeDecl.pkgImport]; !ok {
var err error
if scope, err = LoadPackageScope(wd, typeDecl.pkgImport); err != nil {
fmt.Println(err)
return nil, false
} else {
d.scopeMapping[typeDecl.pkgImport] = scope
}
}
return scope, true
}
func getParams(signature *types.Signature) []*paramDecl {
params := signature.Params()
decls := make([]*paramDecl, params.Len())
for i := 0; i < params.Len(); i++ {
param := params.At(i)
decls[i] = ¶mDecl{
name: param.Name(),
TypeDecl: GetTypeDeclaration(param.Type()),
}
}
return decls
}
func getReturns(signature *types.Signature) []*TypeDecl {
results := signature.Results()
decls := make([]*TypeDecl, results.Len())
for i := 0; i < results.Len(); i++ {
decls[i] = GetTypeDeclaration(results.At(i).Type())
}
return decls
}