Serge Bazanski | cc25bdf | 2018-10-25 14:02:58 +0200 | [diff] [blame] | 1 | // Copyright 2015 go-swagger maintainers |
| 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 swag |
| 16 | |
| 17 | import ( |
| 18 | "math" |
| 19 | "strconv" |
| 20 | "strings" |
| 21 | ) |
| 22 | |
| 23 | // same as ECMA Number.MAX_SAFE_INTEGER and Number.MIN_SAFE_INTEGER |
| 24 | const ( |
| 25 | maxJSONFloat = float64(1<<53 - 1) // 9007199254740991.0 2^53 - 1 |
| 26 | minJSONFloat = -float64(1<<53 - 1) //-9007199254740991.0 -2^53 - 1 |
| 27 | epsilon float64 = 1e-9 |
| 28 | ) |
| 29 | |
| 30 | // IsFloat64AJSONInteger allow for integers [-2^53, 2^53-1] inclusive |
| 31 | func IsFloat64AJSONInteger(f float64) bool { |
| 32 | if math.IsNaN(f) || math.IsInf(f, 0) || f < minJSONFloat || f > maxJSONFloat { |
| 33 | return false |
| 34 | } |
| 35 | fa := math.Abs(f) |
| 36 | g := float64(uint64(f)) |
| 37 | ga := math.Abs(g) |
| 38 | |
| 39 | diff := math.Abs(f - g) |
| 40 | |
| 41 | // more info: https://floating-point-gui.de/errors/comparison/#look-out-for-edge-cases |
| 42 | if f == g { // best case |
| 43 | return true |
| 44 | } else if f == float64(int64(f)) || f == float64(uint64(f)) { // optimistic case |
| 45 | return true |
| 46 | } else if f == 0 || g == 0 || diff < math.SmallestNonzeroFloat64 { // very close to 0 values |
| 47 | return diff < (epsilon * math.SmallestNonzeroFloat64) |
| 48 | } |
| 49 | // check the relative error |
| 50 | return diff/math.Min(fa+ga, math.MaxFloat64) < epsilon |
| 51 | } |
| 52 | |
| 53 | var evaluatesAsTrue map[string]struct{} |
| 54 | |
| 55 | func init() { |
| 56 | evaluatesAsTrue = map[string]struct{}{ |
| 57 | "true": {}, |
| 58 | "1": {}, |
| 59 | "yes": {}, |
| 60 | "ok": {}, |
| 61 | "y": {}, |
| 62 | "on": {}, |
| 63 | "selected": {}, |
| 64 | "checked": {}, |
| 65 | "t": {}, |
| 66 | "enabled": {}, |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | // ConvertBool turn a string into a boolean |
| 71 | func ConvertBool(str string) (bool, error) { |
| 72 | _, ok := evaluatesAsTrue[strings.ToLower(str)] |
| 73 | return ok, nil |
| 74 | } |
| 75 | |
| 76 | // ConvertFloat32 turn a string into a float32 |
| 77 | func ConvertFloat32(str string) (float32, error) { |
| 78 | f, err := strconv.ParseFloat(str, 32) |
| 79 | if err != nil { |
| 80 | return 0, err |
| 81 | } |
| 82 | return float32(f), nil |
| 83 | } |
| 84 | |
| 85 | // ConvertFloat64 turn a string into a float64 |
| 86 | func ConvertFloat64(str string) (float64, error) { |
| 87 | return strconv.ParseFloat(str, 64) |
| 88 | } |
| 89 | |
| 90 | // ConvertInt8 turn a string into int8 boolean |
| 91 | func ConvertInt8(str string) (int8, error) { |
| 92 | i, err := strconv.ParseInt(str, 10, 8) |
| 93 | if err != nil { |
| 94 | return 0, err |
| 95 | } |
| 96 | return int8(i), nil |
| 97 | } |
| 98 | |
| 99 | // ConvertInt16 turn a string into a int16 |
| 100 | func ConvertInt16(str string) (int16, error) { |
| 101 | i, err := strconv.ParseInt(str, 10, 16) |
| 102 | if err != nil { |
| 103 | return 0, err |
| 104 | } |
| 105 | return int16(i), nil |
| 106 | } |
| 107 | |
| 108 | // ConvertInt32 turn a string into a int32 |
| 109 | func ConvertInt32(str string) (int32, error) { |
| 110 | i, err := strconv.ParseInt(str, 10, 32) |
| 111 | if err != nil { |
| 112 | return 0, err |
| 113 | } |
| 114 | return int32(i), nil |
| 115 | } |
| 116 | |
| 117 | // ConvertInt64 turn a string into a int64 |
| 118 | func ConvertInt64(str string) (int64, error) { |
| 119 | return strconv.ParseInt(str, 10, 64) |
| 120 | } |
| 121 | |
| 122 | // ConvertUint8 turn a string into a uint8 |
| 123 | func ConvertUint8(str string) (uint8, error) { |
| 124 | i, err := strconv.ParseUint(str, 10, 8) |
| 125 | if err != nil { |
| 126 | return 0, err |
| 127 | } |
| 128 | return uint8(i), nil |
| 129 | } |
| 130 | |
| 131 | // ConvertUint16 turn a string into a uint16 |
| 132 | func ConvertUint16(str string) (uint16, error) { |
| 133 | i, err := strconv.ParseUint(str, 10, 16) |
| 134 | if err != nil { |
| 135 | return 0, err |
| 136 | } |
| 137 | return uint16(i), nil |
| 138 | } |
| 139 | |
| 140 | // ConvertUint32 turn a string into a uint32 |
| 141 | func ConvertUint32(str string) (uint32, error) { |
| 142 | i, err := strconv.ParseUint(str, 10, 32) |
| 143 | if err != nil { |
| 144 | return 0, err |
| 145 | } |
| 146 | return uint32(i), nil |
| 147 | } |
| 148 | |
| 149 | // ConvertUint64 turn a string into a uint64 |
| 150 | func ConvertUint64(str string) (uint64, error) { |
| 151 | return strconv.ParseUint(str, 10, 64) |
| 152 | } |
| 153 | |
| 154 | // FormatBool turns a boolean into a string |
| 155 | func FormatBool(value bool) string { |
| 156 | return strconv.FormatBool(value) |
| 157 | } |
| 158 | |
| 159 | // FormatFloat32 turns a float32 into a string |
| 160 | func FormatFloat32(value float32) string { |
| 161 | return strconv.FormatFloat(float64(value), 'f', -1, 32) |
| 162 | } |
| 163 | |
| 164 | // FormatFloat64 turns a float64 into a string |
| 165 | func FormatFloat64(value float64) string { |
| 166 | return strconv.FormatFloat(value, 'f', -1, 64) |
| 167 | } |
| 168 | |
| 169 | // FormatInt8 turns an int8 into a string |
| 170 | func FormatInt8(value int8) string { |
| 171 | return strconv.FormatInt(int64(value), 10) |
| 172 | } |
| 173 | |
| 174 | // FormatInt16 turns an int16 into a string |
| 175 | func FormatInt16(value int16) string { |
| 176 | return strconv.FormatInt(int64(value), 10) |
| 177 | } |
| 178 | |
| 179 | // FormatInt32 turns an int32 into a string |
| 180 | func FormatInt32(value int32) string { |
| 181 | return strconv.Itoa(int(value)) |
| 182 | } |
| 183 | |
| 184 | // FormatInt64 turns an int64 into a string |
| 185 | func FormatInt64(value int64) string { |
| 186 | return strconv.FormatInt(value, 10) |
| 187 | } |
| 188 | |
| 189 | // FormatUint8 turns an uint8 into a string |
| 190 | func FormatUint8(value uint8) string { |
| 191 | return strconv.FormatUint(uint64(value), 10) |
| 192 | } |
| 193 | |
| 194 | // FormatUint16 turns an uint16 into a string |
| 195 | func FormatUint16(value uint16) string { |
| 196 | return strconv.FormatUint(uint64(value), 10) |
| 197 | } |
| 198 | |
| 199 | // FormatUint32 turns an uint32 into a string |
| 200 | func FormatUint32(value uint32) string { |
| 201 | return strconv.FormatUint(uint64(value), 10) |
| 202 | } |
| 203 | |
| 204 | // FormatUint64 turns an uint64 into a string |
| 205 | func FormatUint64(value uint64) string { |
| 206 | return strconv.FormatUint(value, 10) |
| 207 | } |