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Copy pathgconv.go
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567 lines (537 loc) · 10.6 KB
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// Copyright 2017 gf Author(https://github.com/gogf/gf). All Rights Reserved.
//
// This Source Code Form is subject to the terms of the MIT License.
// If a copy of the MIT was not distributed with this file,
// You can obtain one at https://github.com/gogf/gf.
// Package gconv implements powerful and convenient converting functionality for any types of variables.
package gconv
import (
"encoding/json"
"fmt"
"github.com/gogf/gf/os/gtime"
"reflect"
"strconv"
"strings"
"time"
"github.com/gogf/gf/encoding/gbinary"
)
// Type assert api for String().
type apiString interface {
String() string
}
// Type assert api for Error().
type apiError interface {
Error() string
}
var (
// Empty strings.
emptyStringMap = map[string]struct{}{
"": {},
"0": {},
"no": {},
"off": {},
"false": {},
}
// Priority tags for Map*/Struct* functions.
// Note, the "gconv", "param", "params" tags are used by old version of package.
// It is strongly recommended using short tag "c" or "p" instead in the future.
structTagPriority = []string{"gconv", "param", "params", "c", "p", "json"}
)
// Convert converts the variable <i> to the type <t>, the type <t> is specified by string.
// The optional parameter <params> is used for additional necessary parameter for this conversion.
// It supports common types conversion as its conversion based on type name string.
func Convert(i interface{}, t string, params ...interface{}) interface{} {
switch t {
case "int":
return Int(i)
case "int8":
return Int8(i)
case "int16":
return Int16(i)
case "int32":
return Int32(i)
case "int64":
return Int64(i)
case "uint":
return Uint(i)
case "uint8":
return Uint8(i)
case "uint16":
return Uint16(i)
case "uint32":
return Uint32(i)
case "uint64":
return Uint64(i)
case "float32":
return Float32(i)
case "float64":
return Float64(i)
case "bool":
return Bool(i)
case "string":
return String(i)
case "[]byte":
return Bytes(i)
case "[]int":
return Ints(i)
case "[]int32":
return Int32s(i)
case "[]int64":
return Int64s(i)
case "[]uint":
return Uints(i)
case "[]uint32":
return Uint32s(i)
case "[]uint64":
return Uint64s(i)
case "[]float32":
return Float32s(i)
case "[]float64":
return Float64s(i)
case "[]string":
return Strings(i)
case "Time", "time.Time":
if len(params) > 0 {
return Time(i, String(params[0]))
}
return Time(i)
case "gtime.Time":
if len(params) > 0 {
return GTime(i, String(params[0]))
}
return *GTime(i)
case "GTime", "*gtime.Time":
if len(params) > 0 {
return GTime(i, String(params[0]))
}
return GTime(i)
case "Duration", "time.Duration":
return Duration(i)
default:
return i
}
}
// Byte converts <i> to byte.
func Byte(i interface{}) byte {
if v, ok := i.(byte); ok {
return v
}
return Uint8(i)
}
// Bytes converts <i> to []byte.
func Bytes(i interface{}) []byte {
if i == nil {
return nil
}
switch value := i.(type) {
case string:
return []byte(value)
case []byte:
return value
default:
return gbinary.Encode(i)
}
}
// Rune converts <i> to rune.
func Rune(i interface{}) rune {
if v, ok := i.(rune); ok {
return v
}
return rune(Int32(i))
}
// Runes converts <i> to []rune.
func Runes(i interface{}) []rune {
if v, ok := i.([]rune); ok {
return v
}
return []rune(String(i))
}
// String converts <i> to string.
// It's most common used converting function.
func String(i interface{}) string {
if i == nil {
return ""
}
switch value := i.(type) {
case int:
return strconv.Itoa(value)
case int8:
return strconv.Itoa(int(value))
case int16:
return strconv.Itoa(int(value))
case int32:
return strconv.Itoa(int(value))
case int64:
return strconv.FormatInt(value, 10)
case uint:
return strconv.FormatUint(uint64(value), 10)
case uint8:
return strconv.FormatUint(uint64(value), 10)
case uint16:
return strconv.FormatUint(uint64(value), 10)
case uint32:
return strconv.FormatUint(uint64(value), 10)
case uint64:
return strconv.FormatUint(value, 10)
case float32:
return strconv.FormatFloat(float64(value), 'f', -1, 32)
case float64:
return strconv.FormatFloat(value, 'f', -1, 64)
case bool:
return strconv.FormatBool(value)
case string:
return value
case []byte:
return string(value)
case time.Time:
if value.IsZero() {
return ""
}
return value.String()
case *time.Time:
if value == nil {
return ""
}
return value.String()
case gtime.Time:
if value.IsZero() {
return ""
}
return value.String()
case *gtime.Time:
if value == nil {
return ""
}
return value.String()
default:
// Empty checks.
if value == nil {
return ""
}
if f, ok := value.(apiString); ok {
// If the variable implements the String() interface,
// then use that interface to perform the conversion
return f.String()
}
if f, ok := value.(apiError); ok {
// If the variable implements the Error() interface,
// then use that interface to perform the conversion
return f.Error()
}
// Reflect checks.
rv := reflect.ValueOf(value)
kind := rv.Kind()
switch kind {
case reflect.Chan,
reflect.Map,
reflect.Slice,
reflect.Func,
reflect.Ptr,
reflect.Interface,
reflect.UnsafePointer:
if rv.IsNil() {
return ""
}
}
if kind == reflect.Ptr {
return String(rv.Elem().Interface())
}
// Finally we use json.Marshal to convert.
if jsonContent, err := json.Marshal(value); err != nil {
return fmt.Sprint(value)
} else {
return string(jsonContent)
}
}
}
// Bool converts <i> to bool.
// It returns false if <i> is: false, "", 0, "false", "off", "no", empty slice/map.
func Bool(i interface{}) bool {
if i == nil {
return false
}
switch value := i.(type) {
case bool:
return value
case []byte:
if _, ok := emptyStringMap[strings.ToLower(string(value))]; ok {
return false
}
return true
case string:
if _, ok := emptyStringMap[strings.ToLower(value)]; ok {
return false
}
return true
default:
rv := reflect.ValueOf(i)
switch rv.Kind() {
case reflect.Ptr:
return !rv.IsNil()
case reflect.Map:
fallthrough
case reflect.Array:
fallthrough
case reflect.Slice:
return rv.Len() != 0
case reflect.Struct:
return true
default:
s := strings.ToLower(String(i))
if _, ok := emptyStringMap[s]; ok {
return false
}
return true
}
}
}
// Int converts <i> to int.
func Int(i interface{}) int {
if i == nil {
return 0
}
if v, ok := i.(int); ok {
return v
}
return int(Int64(i))
}
// Int8 converts <i> to int8.
func Int8(i interface{}) int8 {
if i == nil {
return 0
}
if v, ok := i.(int8); ok {
return v
}
return int8(Int64(i))
}
// Int16 converts <i> to int16.
func Int16(i interface{}) int16 {
if i == nil {
return 0
}
if v, ok := i.(int16); ok {
return v
}
return int16(Int64(i))
}
// Int32 converts <i> to int32.
func Int32(i interface{}) int32 {
if i == nil {
return 0
}
if v, ok := i.(int32); ok {
return v
}
return int32(Int64(i))
}
// Int64 converts <i> to int64.
func Int64(i interface{}) int64 {
if i == nil {
return 0
}
switch value := i.(type) {
case int:
return int64(value)
case int8:
return int64(value)
case int16:
return int64(value)
case int32:
return int64(value)
case int64:
return value
case uint:
return int64(value)
case uint8:
return int64(value)
case uint16:
return int64(value)
case uint32:
return int64(value)
case uint64:
return int64(value)
case float32:
return int64(value)
case float64:
return int64(value)
case bool:
if value {
return 1
}
return 0
case []byte:
return gbinary.DecodeToInt64(value)
default:
s := String(value)
isMinus := false
if len(s) > 0 {
if s[0] == '-' {
isMinus = true
s = s[1:]
} else if s[0] == '+' {
s = s[1:]
}
}
// Hexadecimal
if len(s) > 2 && s[0] == '0' && (s[1] == 'x' || s[1] == 'X') {
if v, e := strconv.ParseInt(s[2:], 16, 64); e == nil {
if isMinus {
return -v
}
return v
}
}
// Octal
if len(s) > 1 && s[0] == '0' {
if v, e := strconv.ParseInt(s[1:], 8, 64); e == nil {
if isMinus {
return -v
}
return v
}
}
// Decimal
if v, e := strconv.ParseInt(s, 10, 64); e == nil {
if isMinus {
return -v
}
return v
}
// Float64
return int64(Float64(value))
}
}
// Uint converts <i> to uint.
func Uint(i interface{}) uint {
if i == nil {
return 0
}
if v, ok := i.(uint); ok {
return v
}
return uint(Uint64(i))
}
// Uint8 converts <i> to uint8.
func Uint8(i interface{}) uint8 {
if i == nil {
return 0
}
if v, ok := i.(uint8); ok {
return v
}
return uint8(Uint64(i))
}
// Uint16 converts <i> to uint16.
func Uint16(i interface{}) uint16 {
if i == nil {
return 0
}
if v, ok := i.(uint16); ok {
return v
}
return uint16(Uint64(i))
}
// Uint32 converts <i> to uint32.
func Uint32(i interface{}) uint32 {
if i == nil {
return 0
}
if v, ok := i.(uint32); ok {
return v
}
return uint32(Uint64(i))
}
// Uint64 converts <i> to uint64.
func Uint64(i interface{}) uint64 {
if i == nil {
return 0
}
switch value := i.(type) {
case int:
return uint64(value)
case int8:
return uint64(value)
case int16:
return uint64(value)
case int32:
return uint64(value)
case int64:
return uint64(value)
case uint:
return uint64(value)
case uint8:
return uint64(value)
case uint16:
return uint64(value)
case uint32:
return uint64(value)
case uint64:
return value
case float32:
return uint64(value)
case float64:
return uint64(value)
case bool:
if value {
return 1
}
return 0
case []byte:
return gbinary.DecodeToUint64(value)
default:
s := String(value)
// Hexadecimal
if len(s) > 2 && s[0] == '0' && (s[1] == 'x' || s[1] == 'X') {
if v, e := strconv.ParseUint(s[2:], 16, 64); e == nil {
return v
}
}
// Octal
if len(s) > 1 && s[0] == '0' {
if v, e := strconv.ParseUint(s[1:], 8, 64); e == nil {
return v
}
}
// Decimal
if v, e := strconv.ParseUint(s, 10, 64); e == nil {
return v
}
// Float64
return uint64(Float64(value))
}
}
// Float32 converts <i> to float32.
func Float32(i interface{}) float32 {
if i == nil {
return 0
}
switch value := i.(type) {
case float32:
return value
case float64:
return float32(value)
case []byte:
return gbinary.DecodeToFloat32(value)
default:
v, _ := strconv.ParseFloat(String(i), 64)
return float32(v)
}
}
// Float64 converts <i> to float64.
func Float64(i interface{}) float64 {
if i == nil {
return 0
}
switch value := i.(type) {
case float32:
return float64(value)
case float64:
return value
case []byte:
return gbinary.DecodeToFloat64(value)
default:
v, _ := strconv.ParseFloat(String(i), 64)
return v
}
}