112 lines
2.5 KiB
Go
112 lines
2.5 KiB
Go
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// Copyright 2015 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package mysql
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import (
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"strconv"
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"strings"
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"github.com/juju/errors"
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)
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var zeroSet = Set{Name: "", Value: 0}
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// Set is for MySQL Set type.
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type Set struct {
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Name string
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Value uint64
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}
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// String implements fmt.Stringer interface.
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func (e Set) String() string {
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return e.Name
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}
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// ToNumber changes Set to float64 for numeric operation.
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func (e Set) ToNumber() float64 {
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return float64(e.Value)
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}
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// ParseSetName creates a Set with name.
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func ParseSetName(elems []string, name string) (Set, error) {
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if len(name) == 0 {
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return zeroSet, nil
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}
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seps := strings.Split(name, ",")
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marked := make(map[string]struct{}, len(seps))
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for _, s := range seps {
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marked[strings.ToLower(s)] = struct{}{}
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}
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items := make([]string, 0, len(seps))
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value := uint64(0)
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for i, n := range elems {
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key := strings.ToLower(n)
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if _, ok := marked[key]; ok {
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value |= (1 << uint64(i))
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delete(marked, key)
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items = append(items, key)
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}
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}
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if len(marked) == 0 {
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return Set{Name: strings.Join(items, ","), Value: value}, nil
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}
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// name doesn't exist, maybe an integer?
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if num, err := strconv.ParseUint(name, 0, 64); err == nil {
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return ParseSetValue(elems, num)
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}
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return Set{}, errors.Errorf("item %s is not in Set %v", name, elems)
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}
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var (
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setIndexValue []uint64
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setIndexInvertValue []uint64
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)
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func init() {
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setIndexValue = make([]uint64, 64)
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setIndexInvertValue = make([]uint64, 64)
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for i := 0; i < 64; i++ {
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setIndexValue[i] = 1 << uint64(i)
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setIndexInvertValue[i] = ^setIndexValue[i]
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}
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}
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// ParseSetValue creates a Set with special number.
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func ParseSetValue(elems []string, number uint64) (Set, error) {
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if number == 0 {
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return zeroSet, nil
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}
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value := number
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var items []string
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for i := 0; i < len(elems); i++ {
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if number&setIndexValue[i] > 0 {
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items = append(items, elems[i])
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number &= setIndexInvertValue[i]
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}
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}
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if number != 0 {
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return Set{}, errors.Errorf("invalid number %d for Set %v", number, elems)
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}
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return Set{Name: strings.Join(items, ","), Value: value}, nil
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}
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