63 lines
1.6 KiB
Go
63 lines
1.6 KiB
Go
// Copyright 2015 PingCAP, Inc.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package mysql
|
|
|
|
import (
|
|
"strconv"
|
|
"strings"
|
|
|
|
"github.com/juju/errors"
|
|
)
|
|
|
|
// Enum is for MySQL enum type.
|
|
type Enum struct {
|
|
Name string
|
|
Value uint64
|
|
}
|
|
|
|
// String implements fmt.Stringer interface.
|
|
func (e Enum) String() string {
|
|
return e.Name
|
|
}
|
|
|
|
// ToNumber changes enum index to float64 for numeric operation.
|
|
func (e Enum) ToNumber() float64 {
|
|
return float64(e.Value)
|
|
}
|
|
|
|
// ParseEnumName creates a Enum with item name.
|
|
func ParseEnumName(elems []string, name string) (Enum, error) {
|
|
for i, n := range elems {
|
|
if strings.EqualFold(n, name) {
|
|
return Enum{Name: n, Value: uint64(i) + 1}, nil
|
|
}
|
|
}
|
|
|
|
// name doesn't exist, maybe an integer?
|
|
if num, err := strconv.ParseUint(name, 0, 64); err == nil {
|
|
return ParseEnumValue(elems, num)
|
|
}
|
|
|
|
return Enum{}, errors.Errorf("item %s is not in enum %v", name, elems)
|
|
}
|
|
|
|
// ParseEnumValue creates a Enum with special number.
|
|
func ParseEnumValue(elems []string, number uint64) (Enum, error) {
|
|
if number == 0 || number > uint64(len(elems)) {
|
|
return Enum{}, errors.Errorf("number %d overflow enum boundary [1, %d]", number, len(elems))
|
|
}
|
|
|
|
return Enum{Name: elems[number-1], Value: number}, nil
|
|
}
|