gconv

package
v0.0.0-...-c4191a4 Latest Latest
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 Go to latest Published: Jan 31, 2024 License: MIT Imports: 20 Imported by: 0

Documentation

Overview

Package gconv implements powerful and convenient converting functionality for any types of variables.

This package should keep much less dependencies with other packages.

Index

Constants

This section is empty.

Variables

View Source 
var (

	// StructTagPriority defines the default priority tags for Map*/Struct* functions.
	// Note that, the `gconv/param` tags are used by old version of package.
	// It is strongly recommended using short tag `c/p` instead in the future.
	StructTagPriority = []string{
		gtag.GConv, gtag.Param, gtag.GConvShort, gtag.ParamShort, gtag.Json,
	}
)

Functions

func Bool 

func Bool(any interface{}) bool

Bool converts `any` to bool. It returns false if `any` is: false, "", 0, "false", "off", "no", empty slice/map.

func Byte 

func Byte(any interface{}) byte

Byte converts `any` to byte.

func Bytes 

func Bytes(any interface{}) []byte

Bytes converts `any` to []byte.

func Convert 

func Convert(fromValue interface{}, toTypeName string, extraParams ...interface{}) interface{}

Convert converts the variable `fromValue` to the type `toTypeName`, the type `toTypeName` is specified by string.

The optional parameter `extraParams` is used for additional necessary parameter for this conversion. It supports common basic types conversion as its conversion based on type name string.

func ConvertWithRefer 

func ConvertWithRefer(fromValue interface{}, referValue interface{}, extraParams ...interface{}) interface{}

ConvertWithRefer converts the variable `fromValue` to the type referred by value `referValue`.

The optional parameter `extraParams` is used for additional necessary parameter for this conversion. It supports common basic types conversion as its conversion based on type name string.

func Duration 

func Duration(any interface{}) time.Duration

Duration converts `any` to time.Duration. If `any` is string, then it uses time.ParseDuration to convert it. If `any` is numeric, then it converts `any` as nanoseconds.

func Float32 

func Float32(any interface{}) float32

Float32 converts `any` to float32.

func Float32s 

func Float32s(any interface{}) []float32

Float32s converts `any` to []float32.

func Float64 

func Float64(any interface{}) float64

Float64 converts `any` to float64.

func Float64s 

func Float64s(any interface{}) []float64

Float64s converts `any` to []float64.

func Floats 

func Floats(any interface{}) []float64

Floats converts `any` to []float64.

func GTime 

func GTime(any interface{}, format ...string) *gtime.Time

GTime converts `any` to *gtime.Time. The parameter `format` can be used to specify the format of `any`. It returns the converted value that matched the first format of the formats slice. If no `format` given, it converts `any` using gtime.NewFromTimeStamp if `any` is numeric, or using gtime.StrToTime if `any` is string.

func Int 

func Int(any interface{}) int

Int converts `any` to int.

func Int16 

func Int16(any interface{}) int16

Int16 converts `any` to int16.

func Int32 

func Int32(any interface{}) int32

Int32 converts `any` to int32.

func Int32s 

func Int32s(any interface{}) []int32

Int32s converts `any` to []int32.

func Int64 

func Int64(any interface{}) int64

Int64 converts `any` to int64.

func Int64s 

func Int64s(any interface{}) []int64

Int64s converts `any` to []int64.

func Int8 

func Int8(any interface{}) int8

Int8 converts `any` to int8.

func Interfaces 

func Interfaces(any interface{}) []interface{}

Interfaces converts `any` to []interface{}.

func Ints 

func Ints(any interface{}) []int

Ints converts `any` to []int.

func Map 

func Map(value interface{}, option ...MapOption) map[string]interface{}

Map converts any variable `value` to map[string]interface{}. If the parameter `value` is not a map/struct/*struct type, then the conversion will fail and returns nil.

If `value` is a struct/*struct object, the second parameter `tags` specifies the most priority tags that will be detected, otherwise it detects the tags in order of: gconv, json, field name.

func MapDeep 

func MapDeep(value interface{}, tags ...string) map[string]interface{}

MapDeep does Map function recursively, which means if the attribute of `value` is also a struct/*struct, calls Map function on this attribute converting it to a map[string]interface{} type variable. Deprecated: used Map instead.

func MapStrStr 

func MapStrStr(value interface{}, option ...MapOption) map[string]string

MapStrStr converts `value` to map[string]string. Note that there might be data copy for this map type converting.

func MapStrStrDeep 

func MapStrStrDeep(value interface{}, tags ...string) map[string]string

MapStrStrDeep converts `value` to map[string]string recursively. Note that there might be data copy for this map type converting. Deprecated: used MapStrStr instead.

func MapToMap 

func MapToMap(params interface{}, pointer interface{}, mapping ...map[string]string) error

MapToMap converts any map type variable `params` to another map type variable `pointer` using reflect. See doMapToMap.

func MapToMaps 

func MapToMaps(params interface{}, pointer interface{}, mapping ...map[string]string) error

MapToMaps converts any slice type variable `params` to another map slice type variable `pointer`. See doMapToMaps.

func Maps 

func Maps(value interface{}, option ...MapOption) []map[string]interface{}

Maps converts `value` to []map[string]interface{}. Note that it automatically checks and converts json string to []map if `value` is string/[]byte.

func MapsDeep 

func MapsDeep(value interface{}, tags ...string) []map[string]interface{}

MapsDeep converts `value` to []map[string]interface{} recursively.

TODO completely implement the recursive converting for all types. Deprecated: used Maps instead.

func PtrAny 

func PtrAny(any interface{}) *interface{}

PtrAny creates and returns an interface{} pointer variable to this value.

func PtrBool 

func PtrBool(any interface{}) *bool

PtrBool creates and returns a bool pointer variable to this value.

func PtrFloat32 

func PtrFloat32(any interface{}) *float32

PtrFloat32 creates and returns a float32 pointer variable to this value.

func PtrFloat64 

func PtrFloat64(any interface{}) *float64

PtrFloat64 creates and returns a float64 pointer variable to this value.

func PtrInt 

func PtrInt(any interface{}) *int

PtrInt creates and returns an int pointer variable to this value.

func PtrInt16 

func PtrInt16(any interface{}) *int16

PtrInt16 creates and returns an int16 pointer variable to this value.

func PtrInt32 

func PtrInt32(any interface{}) *int32

PtrInt32 creates and returns an int32 pointer variable to this value.

func PtrInt64 

func PtrInt64(any interface{}) *int64

PtrInt64 creates and returns an int64 pointer variable to this value.

func PtrInt8 

func PtrInt8(any interface{}) *int8

PtrInt8 creates and returns an int8 pointer variable to this value.

func PtrString 

func PtrString(any interface{}) *string

PtrString creates and returns a string pointer variable to this value.

func PtrUint 

func PtrUint(any interface{}) *uint

PtrUint creates and returns an uint pointer variable to this value.

func PtrUint16 

func PtrUint16(any interface{}) *uint16

PtrUint16 creates and returns an uint16 pointer variable to this value.

func PtrUint32 

func PtrUint32(any interface{}) *uint32

PtrUint32 creates and returns an uint32 pointer variable to this value.

func PtrUint64 

func PtrUint64(any interface{}) *uint64

PtrUint64 creates and returns an uint64 pointer variable to this value.

func PtrUint8 

func PtrUint8(any interface{}) *uint8

PtrUint8 creates and returns an uint8 pointer variable to this value.

func RegisterConverter 

func RegisterConverter(fn interface{}) (err error)

RegisterConverter to register custom converter. It must be registered before you use this custom converting feature. It is suggested to do it in boot.

Note:

  1. The parameter `fn` must be defined as pattern `func(T1) (T2, error)`. It will convert type `T1` to type `T2`.
  2. The `T1` should not be type of pointer, but the `T2` should be type of pointer.

func Rune 

func Rune(any interface{}) rune

Rune converts `any` to rune.

func Runes 

func Runes(any interface{}) []rune

Runes converts `any` to []rune.

func Scan 

func Scan(params interface{}, pointer interface{}, paramKeyToAttrMap ...map[string]string) (err error)

Scan automatically checks the type of `pointer` and converts `params` to `pointer`. It supports `pointer` with type of `*map/*[]map/*[]*map/*struct/**struct/*[]struct/*[]*struct` for converting.

It calls function `doMapToMap` internally if `pointer` is type of *map for converting. It calls function `doMapToMaps` internally if `pointer` is type of *[]map/*[]*map for converting. It calls function `doStruct` internally if `pointer` is type of *struct/**struct for converting. It calls function `doStructs` internally if `pointer` is type of *[]struct/*[]*struct for converting.

func ScanList 

func ScanList(structSlice interface{}, structSlicePointer interface{}, bindToAttrName string, relationAttrNameAndFields ...string) (err error)

ScanList converts `structSlice` to struct slice which contains other complex struct attributes. Note that the parameter `structSlicePointer` should be type of *[]struct/*[]*struct.

Usage example 1: Normal attribute struct relation: 

type EntityUser struct {
    Uid  int
    Name string
}

type EntityUserDetail struct {
    Uid     int
    Address string
}

type EntityUserScores struct {
    Id     int
    Uid    int
    Score  int
    Course string
}

type Entity struct {
    User       *EntityUser
    UserDetail *EntityUserDetail
    UserScores []*EntityUserScores
}

var users []*Entity var userRecords = EntityUser{Uid: 1, Name:"john"} var detailRecords = EntityUser{Uid: 1, Address: "chengdu"} var scoresRecords = EntityUser{Id: 1, Uid: 1, Score: 100, Course: "math"} ScanList(userRecords, &users, "User") ScanList(userRecords, &users, "User", "uid") ScanList(detailRecords, &users, "UserDetail", "User", "uid:Uid") ScanList(scoresRecords, &users, "UserScores", "User", "uid:Uid") ScanList(scoresRecords, &users, "UserScores", "User", "uid")

Usage example 2: Embedded attribute struct relation: 

type EntityUser struct {
	   Uid  int
	   Name string
}

type EntityUserDetail struct {
	   Uid     int
	   Address string
}

type EntityUserScores struct {
	   Id    int
	   Uid   int
	   Score int
}

type Entity struct {
	   EntityUser
	   UserDetail EntityUserDetail
	   UserScores []EntityUserScores
}

var userRecords = EntityUser{Uid: 1, Name:"john"} var detailRecords = EntityUser{Uid: 1, Address: "chengdu"} var scoresRecords = EntityUser{Id: 1, Uid: 1, Score: 100, Course: "math"} ScanList(userRecords, &users) ScanList(detailRecords, &users, "UserDetail", "uid") ScanList(scoresRecords, &users, "UserScores", "uid")

The parameters "User/UserDetail/UserScores" in the example codes specify the target attribute struct that current result will be bound to.

The "uid" in the example codes is the table field name of the result, and the "Uid" is the relational struct attribute name - not the attribute name of the bound to target. In the example codes, it's attribute name "Uid" of "User" of entity "Entity". It automatically calculates the HasOne/HasMany relationship with given `relation` parameter.

See the example or unit testing cases for clear understanding for this function.

func SliceAny 

func SliceAny(any interface{}) []interface{}

SliceAny is alias of Interfaces.

func SliceFloat 

func SliceFloat(any interface{}) []float64

SliceFloat is alias of Floats.

func SliceFloat32 

func SliceFloat32(any interface{}) []float32

SliceFloat32 is alias of Float32s.

func SliceFloat64 

func SliceFloat64(any interface{}) []float64

SliceFloat64 is alias of Float64s.

func SliceInt 

func SliceInt(any interface{}) []int

SliceInt is alias of Ints.

func SliceInt32 

func SliceInt32(any interface{}) []int32

SliceInt32 is alias of Int32s.

func SliceInt64 

func SliceInt64(any interface{}) []int64

SliceInt64 is alias of Int64s.

func SliceMap 

func SliceMap(any interface{}, option ...MapOption) []map[string]interface{}

SliceMap is alias of Maps.

func SliceMapDeep 

func SliceMapDeep(any interface{}) []map[string]interface{}

SliceMapDeep is alias of MapsDeep. Deprecated: used SliceMap instead.

func SliceStr 

func SliceStr(any interface{}) []string

SliceStr is alias of Strings.

func SliceStruct 

func SliceStruct(params interface{}, pointer interface{}, mapping ...map[string]string) (err error)

SliceStruct is alias of Structs.

func SliceUint 

func SliceUint(any interface{}) []uint

SliceUint is alias of Uints.

func SliceUint32 

func SliceUint32(any interface{}) []uint32

SliceUint32 is alias of Uint32s.

func SliceUint64 

func SliceUint64(any interface{}) []uint64

SliceUint64 is alias of Uint64s.

func String 

func String(any interface{}) string

String converts `any` to string. It's most commonly used converting function.

func Strings 

func Strings(any interface{}) []string

Strings converts `any` to []string.

func Struct 

func Struct(params interface{}, pointer interface{}, paramKeyToAttrMap ...map[string]string) (err error)

Struct maps the params key-value pairs to the corresponding struct object's attributes. The third parameter `mapping` is unnecessary, indicating the mapping rules between the custom key name and the attribute name(case-sensitive).

Note:

  1. The `params` can be any type of map/struct, usually a map.
  2. The `pointer` should be type of *struct/**struct, which is a pointer to struct object or struct pointer.
  3. Only the public attributes of struct object can be mapped.
  4. If `params` is a map, the key of the map `params` can be lowercase. It will automatically convert the first letter of the key to uppercase in mapping procedure to do the matching. It ignores the map key, if it does not match.

func StructTag 

func StructTag(params interface{}, pointer interface{}, priorityTag string) (err error)

StructTag acts as Struct but also with support for priority tag feature, which retrieves the specified tags for `params` key-value items to struct attribute names mapping. The parameter `priorityTag` supports multiple tags that can be joined with char ','.

func Structs 

func Structs(params interface{}, pointer interface{}, paramKeyToAttrMap ...map[string]string) (err error)

Structs converts any slice to given struct slice. Also see Scan, Struct.

func StructsTag 

func StructsTag(params interface{}, pointer interface{}, priorityTag string) (err error)

StructsTag acts as Structs but also with support for priority tag feature, which retrieves the specified tags for `params` key-value items to struct attribute names mapping. The parameter `priorityTag` supports multiple tags that can be joined with char ','.

func Time 

func Time(any interface{}, format ...string) time.Time

Time converts `any` to time.Time.

func Uint 

func Uint(any interface{}) uint

Uint converts `any` to uint.

func Uint16 

func Uint16(any interface{}) uint16

Uint16 converts `any` to uint16.

func Uint32 

func Uint32(any interface{}) uint32

Uint32 converts `any` to uint32.

func Uint32s 

func Uint32s(any interface{}) []uint32

Uint32s converts `any` to []uint32.

func Uint64 

func Uint64(any interface{}) uint64

Uint64 converts `any` to uint64.

func Uint64s 

func Uint64s(any interface{}) []uint64

Uint64s converts `any` to []uint64.

func Uint8 

func Uint8(any interface{}) uint8

Uint8 converts `any` to uint8.

func Uints 

func Uints(any interface{}) []uint

Uints converts `any` to []uint.

func UnsafeBytesToStr 

func UnsafeBytesToStr(b []byte) string

UnsafeBytesToStr converts []byte to string without memory copy. Note that, if you completely sure you will never use `b` variable in the feature, you can use this unsafe function to implement type conversion in high performance.

func UnsafeStrToBytes 

func UnsafeStrToBytes(s string) []byte

UnsafeStrToBytes converts string to []byte without memory copy. Note that, if you completely sure you will never use `s` variable in the feature, you can use this unsafe function to implement type conversion in high performance.

Types

type MapOption 

type MapOption struct {
	// Deep marks doing Map function recursively, which means if the attribute of given converting value
	// is also a struct/*struct, it automatically calls Map function on this attribute converting it to
	// a map[string]interface{} type variable.
	Deep bool

	// OmitEmpty ignores the attributes that has json `omitempty` tag.
	OmitEmpty bool

	// Tags specifies the converted map key name by struct tag name.
	Tags []string
}

MapOption specifies the option for map converting.

Source Files

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