github.com/cloudwego/frugal@v0.1.15/internal/rt/iface.go (about)

     1  /*
     2   * Copyright 2022 ByteDance Inc.
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *     http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package rt
    18  
    19  import (
    20      `reflect`
    21  )
    22  
    23  type Method struct {
    24      Id int
    25      Vt *GoType
    26  }
    27  
    28  func AsMethod(id int, vt *GoType) Method {
    29      return Method {
    30          Id: id,
    31          Vt: vt,
    32      }
    33  }
    34  
    35  func GetMethod(tp interface{}, name string) Method {
    36      if tp == nil {
    37          panic("value must be an interface pointer")
    38      } else if vt := reflect.TypeOf(tp); vt.Kind() != reflect.Ptr {
    39          panic("value must be an interface pointer")
    40      } else if et := vt.Elem(); et.Kind() != reflect.Interface {
    41          panic("value must be an interface pointer")
    42      } else if mm, ok := et.MethodByName(name); !ok {
    43          panic("interface " + vt.Elem().String() + " does not have method " + name)
    44      } else {
    45          return AsMethod(mm.Index, UnpackType(et))
    46      }
    47  }