k8s.io/apiserver@v0.31.1/pkg/cel/format.go (about)

     1  /*
     2  Copyright 2024 The Kubernetes Authors.
     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 cel
    18  
    19  import (
    20  	"fmt"
    21  	"reflect"
    22  
    23  	"github.com/google/cel-go/cel"
    24  	"github.com/google/cel-go/checker/decls"
    25  	"github.com/google/cel-go/common/types"
    26  	"github.com/google/cel-go/common/types/ref"
    27  )
    28  
    29  var (
    30  	FormatObject = decls.NewObjectType("kubernetes.NamedFormat")
    31  	FormatType   = cel.ObjectType("kubernetes.NamedFormat")
    32  )
    33  
    34  // Format provdes a CEL representation of kubernetes format
    35  type Format struct {
    36  	Name         string
    37  	ValidateFunc func(string) []string
    38  
    39  	// Size of the regex string or estimated equivalent regex string used
    40  	// for cost estimation
    41  	MaxRegexSize int
    42  }
    43  
    44  func (d *Format) ConvertToNative(typeDesc reflect.Type) (interface{}, error) {
    45  	return nil, fmt.Errorf("type conversion error from 'Format' to '%v'", typeDesc)
    46  }
    47  
    48  func (d *Format) ConvertToType(typeVal ref.Type) ref.Val {
    49  	switch typeVal {
    50  	case FormatType:
    51  		return d
    52  	case types.TypeType:
    53  		return FormatType
    54  	default:
    55  		return types.NewErr("type conversion error from '%s' to '%s'", FormatType, typeVal)
    56  	}
    57  }
    58  
    59  func (d *Format) Equal(other ref.Val) ref.Val {
    60  	otherDur, ok := other.(*Format)
    61  	if !ok {
    62  		return types.MaybeNoSuchOverloadErr(other)
    63  	}
    64  	return types.Bool(d.Name == otherDur.Name)
    65  }
    66  
    67  func (d *Format) Type() ref.Type {
    68  	return FormatType
    69  }
    70  
    71  func (d *Format) Value() interface{} {
    72  	return d
    73  }