github.com/greenpau/go-authcrunch@v1.1.4/pkg/errors/errors.go (about)

     1  // Copyright 2022 Paul Greenberg greenpau@outlook.com
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package errors
    16  
    17  import (
    18  	"errors"
    19  	"fmt"
    20  )
    21  
    22  // StandardError is a standard error.
    23  type StandardError string
    24  
    25  func (e StandardError) Error() string {
    26  	return string(e)
    27  }
    28  
    29  // WithArgs accepts errors with parameters.
    30  func (e StandardError) WithArgs(v ...interface{}) error {
    31  	var hasErr, hasNil bool
    32  	for _, vv := range v {
    33  		switch err := vv.(type) {
    34  		case error:
    35  			if err == nil {
    36  				return nil
    37  			}
    38  			hasErr = true
    39  		case nil:
    40  			hasNil = true
    41  		}
    42  	}
    43  
    44  	if hasNil && !hasErr {
    45  		return nil
    46  	}
    47  
    48  	err := advErr{
    49  		err: fmt.Errorf("%w", e),
    50  		v:   v,
    51  	}
    52  
    53  	return err
    54  }
    55  
    56  // advErr is an error with parameters.
    57  type advErr struct {
    58  	err error
    59  	v   []interface{}
    60  }
    61  
    62  // Error returns error string.
    63  func (e advErr) Error() string {
    64  	return fmt.Sprintf(e.err.Error(), e.v...)
    65  }
    66  
    67  // Unwrap returns unwrapped error.
    68  func (e advErr) Unwrap() error {
    69  	return errors.Unwrap(e.err)
    70  }