Merge pull request #161 from joeybloggs/v7-development

Changes for v7

.gitignore

@@ -24,5 +24,6 @@ _testmain.go
 *.prof
 *.test
 *.out
+*.txt
 cover.html
 README.html

README.md

@@ -3,14 +3,14 @@ Package validator
 
 [![Join the chat at https://gitter.im/bluesuncorp/validator](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/bluesuncorp/validator?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 [![Build Status](https://semaphoreci.com/api/v1/projects/ec20115f-ef1b-4c7d-9393-cc76aba74eb4/487374/badge.svg)](https://semaphoreci.com/joeybloggs/validator)
-[![Coverage Status](https://coveralls.io/repos/bluesuncorp/validator/badge.svg?branch=v6)](https://coveralls.io/r/bluesuncorp/validator?branch=v6)
-[![GoDoc](https://godoc.org/gopkg.in/bluesuncorp/validator.v6?status.svg)](https://godoc.org/gopkg.in/bluesuncorp/validator.v6)
+[![Coverage Status](https://coveralls.io/repos/bluesuncorp/validator/badge.svg?branch=v7)](https://coveralls.io/r/bluesuncorp/validator?branch=v7)
+[![GoDoc](https://godoc.org/gopkg.in/bluesuncorp/validator.v7?status.svg)](https://godoc.org/gopkg.in/bluesuncorp/validator.v7)
 
 Package validator implements value validations for structs and individual fields based on tags.
 
 It has the following **unique** features:
 
--   Cross Field and Cross Struct validations.  
+-   Cross Field and Cross Struct validations by using validation tags or custom validators.  
 -   Slice, Array and Map diving, which allows any or all levels of a multidimensional field to be validated.  
 -   Handles type interface by determining it's underlying type prior to validation.
 -   Handles custom field types such as sql driver Valuer see [Valuer](https://golang.org/src/database/sql/driver/types.go?s=1210:1293#L29)
@@ -20,20 +20,20 @@ Installation
 
 Use go get.
 
-	go get gopkg.in/bluesuncorp/validator.v6
+	go get gopkg.in/bluesuncorp/validator.v7
 
 or to update
 
-	go get -u gopkg.in/bluesuncorp/validator.v6
+	go get -u gopkg.in/bluesuncorp/validator.v7
 
 Then import the validator package into your own code.
 
-	import "gopkg.in/bluesuncorp/validator.v6"
+	import "gopkg.in/bluesuncorp/validator.v7"
 
 Usage and documentation
 ------
 
-Please see http://godoc.org/gopkg.in/bluesuncorp/validator.v6 for detailed usage docs.
+Please see http://godoc.org/gopkg.in/bluesuncorp/validator.v7 for detailed usage docs.
 
 ##### Examples:
 
@@ -143,7 +143,7 @@ import (
 	"fmt"
 	"reflect"
 
-	"gopkg.in/bluesuncorp/validator.v6"
+	"gopkg.in/bluesuncorp/validator.v7"
 )
 
 // DbBackedUser User struct
@@ -187,29 +187,35 @@ func ValidateValuer(field reflect.Value) interface{} {
 
 Benchmarks
 ------
-###### Run on MacBook Pro (Retina, 15-inch, Late 2013) 2.6 GHz Intel Core i7 16 GB 1600 MHz DDR3
-NOTE: allocations for structs are up from v5, however ns/op for parallel operations are way down.
-It was a decicion not to cache struct info because although it reduced allocation to v5 levels, it
-hurt parallel performance too much.
+###### Run on MacBook Pro (Retina, 15-inch, Late 2013) 2.6 GHz Intel Core i7 16 GB 1600 MHz DDR3 using Go 1.5
 ```go
-$ go test -cpu=4 -bench=. -benchmem=true
 PASS
-BenchmarkFieldSuccess-4	 					 5000000	       318 ns/op	      16 B/op	       1 allocs/op
-BenchmarkFieldFailure-4	 					 5000000	       316 ns/op	      16 B/op	       1 allocs/op
-BenchmarkFieldCustomTypeSuccess-4	 		 3000000	       492 ns/op	      32 B/op	       2 allocs/op
-BenchmarkFieldCustomTypeFailure-4	 		 2000000	       843 ns/op	     416 B/op	       6 allocs/op
-BenchmarkFieldOrTagSuccess-4	  			  500000	      2384 ns/op	      20 B/op	       2 allocs/op
-BenchmarkFieldOrTagFailure-4	 			 1000000	      1295 ns/op	     384 B/op	       6 allocs/op
-BenchmarkStructSimpleSuccess-4	 			 1000000	      1175 ns/op	      24 B/op	       3 allocs/op
-BenchmarkStructSimpleFailure-4	 			 1000000	      1822 ns/op	     529 B/op	      11 allocs/op
-BenchmarkStructSimpleCustomTypeSuccess-4	 1000000	      1302 ns/op	      56 B/op	       5 allocs/op
-BenchmarkStructSimpleCustomTypeFailure-4	 1000000	      1847 ns/op	     577 B/op	      13 allocs/op
-BenchmarkStructSimpleSuccessParallel-4	 	 5000000	       339 ns/op	      24 B/op	       3 allocs/op
-BenchmarkStructSimpleFailureParallel-4	 	 2000000	       733 ns/op	     529 B/op	      11 allocs/op
-BenchmarkStructComplexSuccess-4	  			  200000	      7104 ns/op	     368 B/op	      30 allocs/op
-BenchmarkStructComplexFailure-4	  			  100000	     11996 ns/op	    2861 B/op	      72 allocs/op
-BenchmarkStructComplexSuccessParallel-4	 	 1000000	      2252 ns/op	     368 B/op	      30 allocs/op
-BenchmarkStructComplexFailureParallel-4	  	  300000	      4691 ns/op	    2862 B/op	      72 allocs/op
+BenchmarkFieldSuccess-4                            	 5000000	       290 ns/op	      16 B/op	       1 allocs/op
+BenchmarkFieldFailure-4                            	 5000000	       286 ns/op	      16 B/op	       1 allocs/op
+BenchmarkFieldDiveSuccess-4                        	  500000	      2497 ns/op	     384 B/op	      19 allocs/op
+BenchmarkFieldDiveFailure-4                        	  500000	      3022 ns/op	     752 B/op	      23 allocs/op
+BenchmarkFieldCustomTypeSuccess-4                  	 3000000	       446 ns/op	      32 B/op	       2 allocs/op
+BenchmarkFieldCustomTypeFailure-4                  	 2000000	       778 ns/op	     416 B/op	       6 allocs/op
+BenchmarkFieldOrTagSuccess-4                       	 1000000	      1287 ns/op	      32 B/op	       2 allocs/op
+BenchmarkFieldOrTagFailure-4                       	 1000000	      1125 ns/op	     400 B/op	       6 allocs/op
+BenchmarkStructSimpleCustomTypeSuccess-4           	 1000000	      1225 ns/op	      80 B/op	       5 allocs/op
+BenchmarkStructSimpleCustomTypeFailure-4           	 1000000	      1742 ns/op	     608 B/op	      13 allocs/op
+BenchmarkStructPartialSuccess-4                    	 1000000	      1304 ns/op	     400 B/op	      11 allocs/op
+BenchmarkStructPartialFailure-4                    	 1000000	      1818 ns/op	     784 B/op	      16 allocs/op
+BenchmarkStructExceptSuccess-4                     	 2000000	       869 ns/op	     368 B/op	       9 allocs/op
+BenchmarkStructExceptFailure-4                     	 1000000	      1308 ns/op	     400 B/op	      11 allocs/op
+BenchmarkStructSimpleCrossFieldSuccess-4           	 2000000	       973 ns/op	     128 B/op	       6 allocs/op
+BenchmarkStructSimpleCrossFieldFailure-4           	 1000000	      1519 ns/op	     528 B/op	      11 allocs/op
+BenchmarkStructSimpleCrossStructCrossFieldSuccess-4	 1000000	      1382 ns/op	     160 B/op	       8 allocs/op
+BenchmarkStructSimpleCrossStructCrossFieldFailure-4	 1000000	      1931 ns/op	     560 B/op	      13 allocs/op
+BenchmarkStructSimpleSuccess-4                     	 1000000	      1132 ns/op	      48 B/op	       3 allocs/op
+BenchmarkStructSimpleFailure-4                     	 1000000	      1735 ns/op	     560 B/op	      11 allocs/op
+BenchmarkStructSimpleSuccessParallel-4             	 3000000	       363 ns/op	      48 B/op	       3 allocs/op
+BenchmarkStructSimpleFailureParallel-4             	 2000000	       705 ns/op	     560 B/op	      11 allocs/op
+BenchmarkStructComplexSuccess-4                    	  200000	      6935 ns/op	     432 B/op	      27 allocs/op
+BenchmarkStructComplexFailure-4                    	  200000	     11059 ns/op	    2920 B/op	      69 allocs/op
+BenchmarkStructComplexSuccessParallel-4            	 1000000	      2220 ns/op	     432 B/op	      27 allocs/op
+BenchmarkStructComplexFailureParallel-4            	  300000	      4739 ns/op	    2920 B/op	      69 allocs/op
 ```
 
 How to Contribute

benchmarks_test.go

@@ -4,6 +4,7 @@ import (
 	sql "database/sql/driver"
 	"reflect"
 	"testing"
+	"time"
 )
 
 func BenchmarkFieldSuccess(b *testing.B) {
@@ -18,6 +19,18 @@ func BenchmarkFieldFailure(b *testing.B) {
 	}
 }
 
+func BenchmarkFieldDiveSuccess(b *testing.B) {
+	for n := 0; n < b.N; n++ {
+		validate.Field([]string{"val1", "val2", "val3"}, "required,dive,required")
+	}
+}
+
+func BenchmarkFieldDiveFailure(b *testing.B) {
+	for n := 0; n < b.N; n++ {
+		validate.Field([]string{"val1", "", "val3"}, "required,dive,required")
+	}
+}
+
 func BenchmarkFieldCustomTypeSuccess(b *testing.B) {
 
 	customTypes := map[reflect.Type]CustomTypeFunc{}
@@ -62,35 +75,31 @@ func BenchmarkFieldOrTagFailure(b *testing.B) {
 	}
 }
 
-func BenchmarkStructSimpleSuccess(b *testing.B) {
+func BenchmarkStructSimpleCustomTypeSuccess(b *testing.B) {
 
-	type Foo struct {
-		StringValue string `validate:"min=5,max=10"`
-		IntValue    int    `validate:"min=5,max=10"`
-	}
+	customTypes := map[reflect.Type]CustomTypeFunc{}
+	customTypes[reflect.TypeOf((*sql.Valuer)(nil))] = ValidateValuerType
+	customTypes[reflect.TypeOf(valuer{})] = ValidateValuerType
 
-	validFoo := &Foo{StringValue: "Foobar", IntValue: 7}
+	validate := New(Config{TagName: "validate", ValidationFuncs: BakedInValidators, CustomTypeFuncs: customTypes})
 
-	for n := 0; n < b.N; n++ {
-		validate.Struct(validFoo)
+	val := valuer{
+		Name: "1",
 	}
-}
-
-func BenchmarkStructSimpleFailure(b *testing.B) {
 
 	type Foo struct {
-		StringValue string `validate:"min=5,max=10"`
+		Valuer   valuer `validate:"len=1"`
 		IntValue int    `validate:"min=5,max=10"`
 	}
 
-	invalidFoo := &Foo{StringValue: "Fo", IntValue: 3}
+	validFoo := &Foo{Valuer: val, IntValue: 7}
 
 	for n := 0; n < b.N; n++ {
-		validate.Struct(invalidFoo)
+		validate.Struct(validFoo)
 	}
 }
 
-func BenchmarkStructSimpleCustomTypeSuccess(b *testing.B) {
+func BenchmarkStructSimpleCustomTypeFailure(b *testing.B) {
 
 	customTypes := map[reflect.Type]CustomTypeFunc{}
 	customTypes[reflect.TypeOf((*sql.Valuer)(nil))] = ValidateValuerType
@@ -98,44 +107,207 @@ func BenchmarkStructSimpleCustomTypeSuccess(b *testing.B) {
 
 	validate := New(Config{TagName: "validate", ValidationFuncs: BakedInValidators, CustomTypeFuncs: customTypes})
 
-	val := valuer{
-		Name: "1",
-	}
+	val := valuer{}
 
 	type Foo struct {
 		Valuer   valuer `validate:"len=1"`
 		IntValue int    `validate:"min=5,max=10"`
 	}
 
-	validFoo := &Foo{Valuer: val, IntValue: 7}
+	validFoo := &Foo{Valuer: val, IntValue: 3}
 
 	for n := 0; n < b.N; n++ {
 		validate.Struct(validFoo)
 	}
 }
 
-func BenchmarkStructSimpleCustomTypeFailure(b *testing.B) {
+func BenchmarkStructPartialSuccess(b *testing.B) {
 
-	customTypes := map[reflect.Type]CustomTypeFunc{}
-	customTypes[reflect.TypeOf((*sql.Valuer)(nil))] = ValidateValuerType
-	customTypes[reflect.TypeOf(valuer{})] = ValidateValuerType
+	type Test struct {
+		Name     string `validate:"required"`
+		NickName string `validate:"required"`
+	}
 
-	validate := New(Config{TagName: "validate", ValidationFuncs: BakedInValidators, CustomTypeFuncs: customTypes})
+	test := &Test{
+		Name: "Joey Bloggs",
+	}
 
-	val := valuer{}
+	for n := 0; n < b.N; n++ {
+		validate.StructPartial(test, "Name")
+	}
+}
+
+func BenchmarkStructPartialFailure(b *testing.B) {
+
+	type Test struct {
+		Name     string `validate:"required"`
+		NickName string `validate:"required"`
+	}
+
+	test := &Test{
+		Name: "Joey Bloggs",
+	}
+
+	for n := 0; n < b.N; n++ {
+		validate.StructPartial(test, "NickName")
+	}
+}
+
+func BenchmarkStructExceptSuccess(b *testing.B) {
+
+	type Test struct {
+		Name     string `validate:"required"`
+		NickName string `validate:"required"`
+	}
+
+	test := &Test{
+		Name: "Joey Bloggs",
+	}
+
+	for n := 0; n < b.N; n++ {
+		validate.StructPartial(test, "Nickname")
+	}
+}
+
+func BenchmarkStructExceptFailure(b *testing.B) {
+
+	type Test struct {
+		Name     string `validate:"required"`
+		NickName string `validate:"required"`
+	}
+
+	test := &Test{
+		Name: "Joey Bloggs",
+	}
+
+	for n := 0; n < b.N; n++ {
+		validate.StructPartial(test, "Name")
+	}
+}
+
+func BenchmarkStructSimpleCrossFieldSuccess(b *testing.B) {
+
+	type Test struct {
+		Start time.Time
+		End   time.Time `validate:"gtfield=Start"`
+	}
+
+	now := time.Now().UTC()
+	then := now.Add(time.Hour * 5)
+
+	test := &Test{
+		Start: now,
+		End:   then,
+	}
+
+	for n := 0; n < b.N; n++ {
+		validate.Struct(test)
+	}
+}
+
+func BenchmarkStructSimpleCrossFieldFailure(b *testing.B) {
+
+	type Test struct {
+		Start time.Time
+		End   time.Time `validate:"gtfield=Start"`
+	}
+
+	now := time.Now().UTC()
+	then := now.Add(time.Hour * -5)
+
+	test := &Test{
+		Start: now,
+		End:   then,
+	}
+
+	for n := 0; n < b.N; n++ {
+		validate.Struct(test)
+	}
+}
+
+func BenchmarkStructSimpleCrossStructCrossFieldSuccess(b *testing.B) {
+
+	type Inner struct {
+		Start time.Time
+	}
+
+	type Outer struct {
+		Inner     *Inner
+		CreatedAt time.Time `validate:"eqcsfield=Inner.Start"`
+	}
+
+	now := time.Now().UTC()
+
+	inner := &Inner{
+		Start: now,
+	}
+
+	outer := &Outer{
+		Inner:     inner,
+		CreatedAt: now,
+	}
+
+	for n := 0; n < b.N; n++ {
+		validate.Struct(outer)
+	}
+}
+
+func BenchmarkStructSimpleCrossStructCrossFieldFailure(b *testing.B) {
+
+	type Inner struct {
+		Start time.Time
+	}
+
+	type Outer struct {
+		Inner     *Inner
+		CreatedAt time.Time `validate:"eqcsfield=Inner.Start"`
+	}
+
+	now := time.Now().UTC()
+	then := now.Add(time.Hour * 5)
+
+	inner := &Inner{
+		Start: then,
+	}
+
+	outer := &Outer{
+		Inner:     inner,
+		CreatedAt: now,
+	}
+
+	for n := 0; n < b.N; n++ {
+		validate.Struct(outer)
+	}
+}
+
+func BenchmarkStructSimpleSuccess(b *testing.B) {
 
 	type Foo struct {
-		Valuer   valuer `validate:"len=1"`
+		StringValue string `validate:"min=5,max=10"`
 		IntValue    int    `validate:"min=5,max=10"`
 	}
 
-	validFoo := &Foo{Valuer: val, IntValue: 3}
+	validFoo := &Foo{StringValue: "Foobar", IntValue: 7}
 
 	for n := 0; n < b.N; n++ {
 		validate.Struct(validFoo)
 	}
 }
 
+func BenchmarkStructSimpleFailure(b *testing.B) {
+
+	type Foo struct {
+		StringValue string `validate:"min=5,max=10"`
+		IntValue    int    `validate:"min=5,max=10"`
+	}
+
+	invalidFoo := &Foo{StringValue: "Fo", IntValue: 3}
+
+	for n := 0; n < b.N; n++ {
+		validate.Struct(invalidFoo)
+	}
+}
+
 func BenchmarkStructSimpleSuccessParallel(b *testing.B) {
 
 	type Foo struct {

doc.go

@@ -21,7 +21,7 @@ Custom Functions
 Custom functions can be added
 
 	// Structure
-	func customFunc(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
+	func customFunc(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
 
 		if whatever {
 			return false
@@ -36,18 +36,41 @@ Custom functions can be added
 
 Cross Field Validation
 
-Cross Field Validation can be implemented, for example Start & End Date range validation
+Cross Field Validation can be done via the following tags: eqfield, nefield, gtfield, gtefield,
+ltfield, ltefield, eqcsfield, necsfield, gtcsfield, ftecsfield, ltcsfield and ltecsfield. If
+however some custom cross field validation is required, it can be done using a custom validation.
+
+Why not just have cross fields validation tags i.e. only eqcsfield and not eqfield; the reason is
+efficiency, if you want to check a field within the same struct eqfield only has to find the field
+on the same struct, 1 level; but if we used eqcsfield it could be multiple levels down.
+
+	type Inner struct {
+		StartDate time.Time
+	}
+
+	type Outer struct {
+		InnerStructField *Inner
+		CreatedAt time.Time      `validate:"ltecsfield=InnerStructField.StartDate"`
+	}
+
+	now := time.Now()
+
+	inner := &Inner{
+		StartDate: now,
+	}
+
+	outer := &Outer{
+		InnerStructField: inner,
+		CreatedAt: now,
+	}
+
+	errs := validate.Struct(outer)
 
 	// NOTE: when calling validate.Struct(val) topStruct will be the top level struct passed
 	//       into the function
 	//       when calling validate.FieldWithValue(val, field, tag) val will be
 	//       whatever you pass, struct, field...
 	//       when calling validate.Field(field, tag) val will be nil
-	//
-	// Because of the specific requirements and field names within each persons project that
-	// uses this library it is likely that custom functions will need to be created for your
-	// Cross Field Validation needs, however there are some build in Generic Cross Field validations,
-	// see Baked In Validators eqfield, nefield, gtfield, gtefield, ltfield, ltefield and Tags below
 
 Multiple Validators
 
@@ -201,6 +224,10 @@ Here is a list of the current built in validators:
 		Validation on Password field using validate.Struct Usage(eqfield=ConfirmPassword)
 		Validating by field validate.FieldWithValue(password, confirmpassword, "eqfield")
 
+	eqcsfield
+		This does the same as eqfield except that it validates the field provided relative
+		to the top level struct. (Usage: eqcsfield=InnerStructField.Field)
+
 	nefield
 		This will validate the field value against another fields value either within
 		a struct or passed in field.
@@ -208,6 +235,10 @@ Here is a list of the current built in validators:
 		Validation on Color field using validate.Struct Usage(nefield=Color2)
 		Validating by field validate.FieldWithValue(color1, color2, "nefield")
 
+	necsfield
+		This does the same as nefield except that it validates the field provided relative
+		to the top level struct. (Usage: necsfield=InnerStructField.Field)
+
 	gtfield
 		Only valid for Numbers and time.Time types, this will validate the field value
 		against another fields value either within a struct or passed in field.
@@ -215,6 +246,10 @@ Here is a list of the current built in validators:
 		Validation on End field using validate.Struct Usage(gtfield=Start)
 		Validating by field validate.FieldWithValue(start, end, "gtfield")
 
+	gtcsfield
+		This does the same as gtfield except that it validates the field provided relative
+		to the top level struct. (Usage: gtcsfield=InnerStructField.Field)
+
 	gtefield
 		Only valid for Numbers and time.Time types, this will validate the field value
 		against another fields value either within a struct or passed in field.
@@ -222,6 +257,10 @@ Here is a list of the current built in validators:
 		Validation on End field using validate.Struct Usage(gtefield=Start)
 		Validating by field validate.FieldWithValue(start, end, "gtefield")
 
+	gtecsfield
+		This does the same as gtefield except that it validates the field provided relative
+		to the top level struct. (Usage: gtecsfield=InnerStructField.Field)
+
 	ltfield
 		Only valid for Numbers and time.Time types, this will validate the field value
 		against another fields value either within a struct or passed in field.
@@ -229,6 +268,10 @@ Here is a list of the current built in validators:
 		Validation on End field using validate.Struct Usage(ltfield=Start)
 		Validating by field validate.FieldWithValue(start, end, "ltfield")
 
+	ltcsfield
+		This does the same as ltfield except that it validates the field provided relative
+		to the top level struct. (Usage: ltcsfield=InnerStructField.Field)
+
 	ltefield
 		Only valid for Numbers and time.Time types, this will validate the field value
 		against another fields value either within a struct or passed in field.
@@ -236,6 +279,10 @@ Here is a list of the current built in validators:
 		Validation on End field using validate.Struct Usage(ltefield=Start)
 		Validating by field validate.FieldWithValue(start, end, "ltefield")
 
+	ltecsfield
+		This does the same as ltefield except that it validates the field provided relative
+		to the top level struct. (Usage: ltecsfield=InnerStructField.Field)
+
 	alpha
 		This validates that a string value contains alpha characters only
 		(Usage: alpha)

examples_test.go

@@ -3,7 +3,7 @@ package validator_test
 import (
 	"fmt"
 
-	"../validator"
+	"gopkg.in/bluesuncorp/validator.v6"
 )
 
 func ExampleValidate_new() {

util.go

@@ -0,0 +1,216 @@
+package validator
+
+import (
+	"reflect"
+	"strconv"
+	"strings"
+)
+
+const (
+	namespaceSeparator = "."
+	leftBracket        = "["
+	rightBracket       = "]"
+)
+
+func (v *Validate) extractType(current reflect.Value) (reflect.Value, reflect.Kind) {
+
+	switch current.Kind() {
+	case reflect.Ptr:
+
+		if current.IsNil() {
+			return current, reflect.Ptr
+		}
+
+		return v.extractType(current.Elem())
+
+	case reflect.Interface:
+
+		if current.IsNil() {
+			return current, reflect.Interface
+		}
+
+		return v.extractType(current.Elem())
+
+	case reflect.Invalid:
+		return current, reflect.Invalid
+
+	default:
+
+		if v.config.hasCustomFuncs {
+			if fn, ok := v.config.CustomTypeFuncs[current.Type()]; ok {
+				return v.extractType(reflect.ValueOf(fn(current)))
+			}
+		}
+
+		return current, current.Kind()
+	}
+}
+
+func (v *Validate) getStructFieldOK(current reflect.Value, namespace string) (reflect.Value, reflect.Kind, bool) {
+
+	current, kind := v.extractType(current)
+
+	if kind == reflect.Invalid {
+		return current, kind, false
+	}
+
+	if len(namespace) == 0 {
+		return current, kind, true
+	}
+
+	switch kind {
+
+	case reflect.Ptr, reflect.Interface:
+
+		return current, kind, false
+
+	case reflect.Struct:
+
+		typ := current.Type()
+		fld := namespace
+		ns := namespace
+
+		if typ != timeType && typ != timePtrType {
+
+			idx := strings.Index(namespace, namespaceSeparator)
+
+			if idx != -1 {
+				fld = namespace[:idx]
+				ns = namespace[idx+1:]
+			} else {
+				ns = ""
+				idx = len(namespace)
+			}
+
+			bracketIdx := strings.Index(fld, leftBracket)
+			if bracketIdx != -1 {
+				fld = fld[:bracketIdx]
+
+				ns = namespace[bracketIdx:]
+			}
+
+			current = current.FieldByName(fld)
+
+			return v.getStructFieldOK(current, ns)
+		}
+
+	case reflect.Array, reflect.Slice:
+		idx := strings.Index(namespace, leftBracket)
+		idx2 := strings.Index(namespace, rightBracket)
+
+		arrIdx, _ := strconv.Atoi(namespace[idx+1 : idx2])
+
+		if arrIdx >= current.Len() {
+			return current, kind, false
+		}
+
+		startIdx := idx2 + 1
+
+		if startIdx < len(namespace) {
+			if namespace[startIdx:startIdx+1] == namespaceSeparator {
+				startIdx++
+			}
+		}
+
+		return v.getStructFieldOK(current.Index(arrIdx), namespace[startIdx:])
+
+	case reflect.Map:
+		idx := strings.Index(namespace, leftBracket) + 1
+		idx2 := strings.Index(namespace, rightBracket)
+
+		endIdx := idx2
+
+		if endIdx+1 < len(namespace) {
+			if namespace[endIdx+1:endIdx+2] == namespaceSeparator {
+				endIdx++
+			}
+		}
+
+		key := namespace[idx:idx2]
+
+		switch current.Type().Key().Kind() {
+		case reflect.Int:
+			i, _ := strconv.Atoi(key)
+			return v.getStructFieldOK(current.MapIndex(reflect.ValueOf(i)), namespace[endIdx+1:])
+		case reflect.Int8:
+			i, _ := strconv.ParseInt(key, 10, 8)
+			return v.getStructFieldOK(current.MapIndex(reflect.ValueOf(int8(i))), namespace[endIdx+1:])
+		case reflect.Int16:
+			i, _ := strconv.ParseInt(key, 10, 16)
+			return v.getStructFieldOK(current.MapIndex(reflect.ValueOf(int16(i))), namespace[endIdx+1:])
+		case reflect.Int32:
+			i, _ := strconv.ParseInt(key, 10, 32)
+			return v.getStructFieldOK(current.MapIndex(reflect.ValueOf(int32(i))), namespace[endIdx+1:])
+		case reflect.Int64:
+			i, _ := strconv.ParseInt(key, 10, 64)
+			return v.getStructFieldOK(current.MapIndex(reflect.ValueOf(i)), namespace[endIdx+1:])
+		case reflect.Uint:
+			i, _ := strconv.ParseUint(key, 10, 0)
+			return v.getStructFieldOK(current.MapIndex(reflect.ValueOf(uint(i))), namespace[endIdx+1:])
+		case reflect.Uint8:
+			i, _ := strconv.ParseUint(key, 10, 8)
+			return v.getStructFieldOK(current.MapIndex(reflect.ValueOf(uint8(i))), namespace[endIdx+1:])
+		case reflect.Uint16:
+			i, _ := strconv.ParseUint(key, 10, 16)
+			return v.getStructFieldOK(current.MapIndex(reflect.ValueOf(uint16(i))), namespace[endIdx+1:])
+		case reflect.Uint32:
+			i, _ := strconv.ParseUint(key, 10, 32)
+			return v.getStructFieldOK(current.MapIndex(reflect.ValueOf(uint32(i))), namespace[endIdx+1:])
+		case reflect.Uint64:
+			i, _ := strconv.ParseUint(key, 10, 64)
+			return v.getStructFieldOK(current.MapIndex(reflect.ValueOf(i)), namespace[endIdx+1:])
+		case reflect.Float32:
+			f, _ := strconv.ParseFloat(key, 32)
+			return v.getStructFieldOK(current.MapIndex(reflect.ValueOf(float32(f))), namespace[endIdx+1:])
+		case reflect.Float64:
+			f, _ := strconv.ParseFloat(key, 64)
+			return v.getStructFieldOK(current.MapIndex(reflect.ValueOf(f)), namespace[endIdx+1:])
+		case reflect.Bool:
+			b, _ := strconv.ParseBool(key)
+			return v.getStructFieldOK(current.MapIndex(reflect.ValueOf(b)), namespace[endIdx+1:])
+
+		// reflect.Type = string
+		default:
+			return v.getStructFieldOK(current.MapIndex(reflect.ValueOf(key)), namespace[endIdx+1:])
+		}
+	}
+
+	// if got here there was more namespace, cannot go any deeper
+	panic("Invalid field namespace")
+}
+
+// asInt retuns the parameter as a int64
+// or panics if it can't convert
+func asInt(param string) int64 {
+
+	i, err := strconv.ParseInt(param, 0, 64)
+	panicIf(err)
+
+	return i
+}
+
+// asUint returns the parameter as a uint64
+// or panics if it can't convert
+func asUint(param string) uint64 {
+
+	i, err := strconv.ParseUint(param, 0, 64)
+	panicIf(err)
+
+	return i
+}
+
+// asFloat returns the parameter as a float64
+// or panics if it can't convert
+func asFloat(param string) float64 {
+
+	i, err := strconv.ParseFloat(param, 64)
+	panicIf(err)
+
+	return i
+}
+
+func panicIf(err error) {
+	if err != nil {
+		panic(err.Error())
+	}
+}

validator.go

@@ -31,8 +31,8 @@ const (
 	diveTag             = "dive"
 	existsTag           = "exists"
 	fieldErrMsg         = "Key: \"%s\" Error:Field validation for \"%s\" failed on the \"%s\" tag"
-	arrayIndexFieldName = "%s[%d]"
-	mapIndexFieldName   = "%s[%v]"
+	arrayIndexFieldName = "%s" + leftBracket + "%d" + rightBracket
+	mapIndexFieldName   = "%s" + leftBracket + "%v" + rightBracket
 	invalidValidation   = "Invalid validation tag on field %s"
 	undefinedValidation = "Undefined validation function on field %s"
 )
@@ -42,6 +42,7 @@ var (
 	timePtrType    = reflect.TypeOf(&time.Time{})
 	errsPool       = &sync.Pool{New: newValidationErrors}
 	tagsCache      = &tagCacheMap{m: map[string][]*tagCache{}}
+	emptyStructPtr = new(struct{})
 )
 
 // returns new ValidationErrors to the pool
@@ -92,11 +93,12 @@ type Config struct {
 type CustomTypeFunc func(field reflect.Value) interface{}
 
 // Func accepts all values needed for file and cross field validation
+// v             = validator instance, needed but some built in functions for it's custom types
 // topStruct     = top level struct when validating by struct otherwise nil
 // currentStruct = current level struct when validating by struct otherwise optional comparison value
 // field         = field value for validation
 // param         = parameter used in validation i.e. gt=0 param would be 0
-type Func func(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldtype reflect.Type, fieldKind reflect.Kind, param string) bool
+type Func func(v *Validate, topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldtype reflect.Type, fieldKind reflect.Kind, param string) bool
 
 // ValidationErrors is a type of map[string]*FieldError
 // it exists to allow for multiple errors to be passed from this library
@@ -180,7 +182,7 @@ func (v *Validate) Field(field interface{}, tag string) ValidationErrors {
 	errs := errsPool.Get().(ValidationErrors)
 	fieldVal := reflect.ValueOf(field)
 
-	v.traverseField(fieldVal, fieldVal, fieldVal, "", errs, false, tag, "")
+	v.traverseField(fieldVal, fieldVal, fieldVal, "", errs, false, tag, "", false, false, nil)
 
 	if len(errs) == 0 {
 		errsPool.Put(errs)
@@ -198,7 +200,92 @@ func (v *Validate) FieldWithValue(val interface{}, field interface{}, tag string
 	errs := errsPool.Get().(ValidationErrors)
 	topVal := reflect.ValueOf(val)
 
-	v.traverseField(topVal, topVal, reflect.ValueOf(field), "", errs, false, tag, "")
+	v.traverseField(topVal, topVal, reflect.ValueOf(field), "", errs, false, tag, "", false, false, nil)
+
+	if len(errs) == 0 {
+		errsPool.Put(errs)
+		return nil
+	}
+
+	return errs
+}
+
+// StructPartial validates the fields passed in only, ignoring all others.
+// Fields may be provided in a namespaced fashion relative to the  struct provided
+// i.e. NestedStruct.Field or NestedArrayField[0].Struct.Name
+// NOTE: This is normally not needed, however in some specific cases such as: tied to a
+// legacy data structure, it will be useful
+func (v *Validate) StructPartial(current interface{}, fields ...string) ValidationErrors {
+
+	sv, _ := v.extractType(reflect.ValueOf(current))
+	name := sv.Type().Name()
+	m := map[string]*struct{}{}
+
+	if fields != nil {
+		for _, k := range fields {
+
+			flds := strings.Split(k, namespaceSeparator)
+			if len(flds) > 0 {
+
+				key := name + namespaceSeparator
+				for _, s := range flds {
+
+					idx := strings.Index(s, leftBracket)
+
+					if idx != -1 {
+						for idx != -1 {
+							key += s[:idx]
+							m[key] = emptyStructPtr
+
+							idx2 := strings.Index(s, rightBracket)
+							idx2++
+							key += s[idx:idx2]
+							m[key] = emptyStructPtr
+							s = s[idx2:]
+							idx = strings.Index(s, leftBracket)
+						}
+					} else {
+
+						key += s
+						m[key] = emptyStructPtr
+					}
+
+					key += namespaceSeparator
+				}
+			}
+		}
+	}
+
+	errs := errsPool.Get().(ValidationErrors)
+
+	v.tranverseStruct(sv, sv, sv, "", errs, true, len(m) != 0, false, m)
+
+	if len(errs) == 0 {
+		errsPool.Put(errs)
+		return nil
+	}
+
+	return errs
+}
+
+// StructExcept validates all fields except the ones passed in.
+// Fields may be provided in a namespaced fashion relative to the  struct provided
+// i.e. NestedStruct.Field or NestedArrayField[0].Struct.Name
+// NOTE: This is normally not needed, however in some specific cases such as: tied to a
+// legacy data structure, it will be useful
+func (v *Validate) StructExcept(current interface{}, fields ...string) ValidationErrors {
+
+	sv, _ := v.extractType(reflect.ValueOf(current))
+	name := sv.Type().Name()
+	m := map[string]*struct{}{}
+
+	for _, key := range fields {
+		m[name+"."+key] = emptyStructPtr
+	}
+
+	errs := errsPool.Get().(ValidationErrors)
+
+	v.tranverseStruct(sv, sv, sv, "", errs, true, len(m) != 0, true, m)
 
 	if len(errs) == 0 {
 		errsPool.Put(errs)
@@ -214,7 +301,7 @@ func (v *Validate) Struct(current interface{}) ValidationErrors {
 	errs := errsPool.Get().(ValidationErrors)
 	sv := reflect.ValueOf(current)
 
-	v.tranverseStruct(sv, sv, sv, "", errs, true)
+	v.tranverseStruct(sv, sv, sv, "", errs, true, false, false, nil)
 
 	if len(errs) == 0 {
 		errsPool.Put(errs)
@@ -225,7 +312,7 @@ func (v *Validate) Struct(current interface{}) ValidationErrors {
 }
 
 // tranverseStruct traverses a structs fields and then passes them to be validated by traverseField
-func (v *Validate) tranverseStruct(topStruct reflect.Value, currentStruct reflect.Value, current reflect.Value, errPrefix string, errs ValidationErrors, useStructName bool) {
+func (v *Validate) tranverseStruct(topStruct reflect.Value, currentStruct reflect.Value, current reflect.Value, errPrefix string, errs ValidationErrors, useStructName bool, partial bool, exclude bool, includeExclude map[string]*struct{}) {
 
 	if current.Kind() == reflect.Ptr && !current.IsNil() {
 		current = current.Elem()
@@ -235,6 +322,7 @@ func (v *Validate) tranverseStruct(topStruct reflect.Value, currentStruct reflec
 		panic("value passed for validation is not a struct")
 	}
 
+	var ok bool
 	typ := current.Type()
 
 	if useStructName {
@@ -252,29 +340,31 @@ func (v *Validate) tranverseStruct(topStruct reflect.Value, currentStruct reflec
 			continue
 		}
 
-		v.traverseField(topStruct, currentStruct, current.Field(i), errPrefix, errs, true, fld.Tag.Get(v.config.TagName), fld.Name)
+		if partial {
+
+			_, ok = includeExclude[errPrefix+fld.Name]
+
+			if (ok && exclude) || (!ok && !exclude) {
+				continue
+			}
+		}
+
+		v.traverseField(topStruct, currentStruct, current.Field(i), errPrefix, errs, true, fld.Tag.Get(v.config.TagName), fld.Name, partial, exclude, includeExclude)
 	}
 }
 
 // traverseField validates any field, be it a struct or single field, ensures it's validity and passes it along to be validated via it's tag options
-func (v *Validate) traverseField(topStruct reflect.Value, currentStruct reflect.Value, current reflect.Value, errPrefix string, errs ValidationErrors, isStructField bool, tag string, name string) {
+func (v *Validate) traverseField(topStruct reflect.Value, currentStruct reflect.Value, current reflect.Value, errPrefix string, errs ValidationErrors, isStructField bool, tag string, name string, partial bool, exclude bool, includeExclude map[string]*struct{}) {
 
 	if tag == skipValidationTag {
 		return
 	}
 
-	kind := current.Kind()
-
-	if kind == reflect.Ptr && !current.IsNil() {
-		current = current.Elem()
-		kind = current.Kind()
-	}
-
-	// this also allows for tags 'required' and 'omitempty' to be used on
-	// nested struct fields because when len(tags) > 0 below and the value is nil
-	// then required failes and we check for omitempty just before that
-	if ((kind == reflect.Ptr || kind == reflect.Interface) && current.IsNil()) || kind == reflect.Invalid {
+	current, kind := v.extractType(current)
+	var typ reflect.Type
 
+	switch kind {
+	case reflect.Ptr, reflect.Interface, reflect.Invalid:
 		if strings.Contains(tag, omitempty) {
 			return
 		}
@@ -314,41 +404,11 @@ func (v *Validate) traverseField(topStruct reflect.Value, currentStruct reflect.
 		if kind == reflect.Invalid {
 			return
 		}
-	}
-
-	typ := current.Type()
-
-	switch kind {
-	case reflect.Struct, reflect.Interface:
-
-		if kind == reflect.Interface {
-
-			current = current.Elem()
-			kind = current.Kind()
-
-			if kind == reflect.Ptr && !current.IsNil() {
-				current = current.Elem()
-				kind = current.Kind()
-			}
 
-			// changed current, so have to get inner type again
+	case reflect.Struct:
 		typ = current.Type()
 
-			if kind != reflect.Struct {
-				goto FALLTHROUGH
-			}
-		}
-
-		if typ != timeType && typ != timePtrType {
-
-			if kind == reflect.Struct {
-
-				if v.config.hasCustomFuncs {
-					if fn, ok := v.config.CustomTypeFuncs[typ]; ok {
-						v.traverseField(topStruct, currentStruct, reflect.ValueOf(fn(current)), errPrefix, errs, isStructField, tag, name)
-						return
-					}
-				}
+		if typ != timeType {
 
 			// required passed validation above so stop here
 			// if only validating the structs existance.
@@ -356,24 +416,16 @@ func (v *Validate) traverseField(topStruct reflect.Value, currentStruct reflect.
 				return
 			}
 
-				v.tranverseStruct(topStruct, current, current, errPrefix+name+".", errs, false)
+			v.tranverseStruct(topStruct, current, current, errPrefix+name+".", errs, false, partial, exclude, includeExclude)
 			return
 		}
 	}
-	FALLTHROUGH:
-		fallthrough
-	default:
+
 	if len(tag) == 0 {
 		return
 	}
-	}
 
-	if v.config.hasCustomFuncs {
-		if fn, ok := v.config.CustomTypeFuncs[typ]; ok {
-			v.traverseField(topStruct, currentStruct, reflect.ValueOf(fn(current)), errPrefix, errs, isStructField, tag, name)
-			return
-		}
-	}
+	typ = current.Type()
 
 	tags, isCached := tagsCache.Get(tag)
 
@@ -431,7 +483,7 @@ func (v *Validate) traverseField(topStruct reflect.Value, currentStruct reflect.
 
 		if cTag.tagVals[0][0] == omitempty {
 
-			if !hasValue(topStruct, currentStruct, current, typ, kind, "") {
+			if !hasValue(v, topStruct, currentStruct, current, typ, kind, "") {
 				return
 			}
 			continue
@@ -447,9 +499,9 @@ func (v *Validate) traverseField(topStruct reflect.Value, currentStruct reflect.
 		// or panic ;)
 		switch kind {
 		case reflect.Slice, reflect.Array:
-			v.traverseSlice(topStruct, currentStruct, current, errPrefix, errs, diveSubTag, name)
+			v.traverseSlice(topStruct, currentStruct, current, errPrefix, errs, diveSubTag, name, partial, exclude, includeExclude)
 		case reflect.Map:
-			v.traverseMap(topStruct, currentStruct, current, errPrefix, errs, diveSubTag, name)
+			v.traverseMap(topStruct, currentStruct, current, errPrefix, errs, diveSubTag, name, partial, exclude, includeExclude)
 		default:
 			// throw error, if not a slice or map then should not have gotten here
 			// bad dive tag
@@ -459,18 +511,18 @@ func (v *Validate) traverseField(topStruct reflect.Value, currentStruct reflect.
 }
 
 // traverseSlice traverses a Slice or Array's elements and passes them to traverseField for validation
-func (v *Validate) traverseSlice(topStruct reflect.Value, currentStruct reflect.Value, current reflect.Value, errPrefix string, errs ValidationErrors, tag string, name string) {
+func (v *Validate) traverseSlice(topStruct reflect.Value, currentStruct reflect.Value, current reflect.Value, errPrefix string, errs ValidationErrors, tag string, name string, partial bool, exclude bool, includeExclude map[string]*struct{}) {
 
 	for i := 0; i < current.Len(); i++ {
-		v.traverseField(topStruct, currentStruct, current.Index(i), errPrefix, errs, false, tag, fmt.Sprintf(arrayIndexFieldName, name, i))
+		v.traverseField(topStruct, currentStruct, current.Index(i), errPrefix, errs, false, tag, fmt.Sprintf(arrayIndexFieldName, name, i), partial, exclude, includeExclude)
 	}
 }
 
 // traverseMap traverses a map's elements and passes them to traverseField for validation
-func (v *Validate) traverseMap(topStruct reflect.Value, currentStruct reflect.Value, current reflect.Value, errPrefix string, errs ValidationErrors, tag string, name string) {
+func (v *Validate) traverseMap(topStruct reflect.Value, currentStruct reflect.Value, current reflect.Value, errPrefix string, errs ValidationErrors, tag string, name string, partial bool, exclude bool, includeExclude map[string]*struct{}) {
 
 	for _, key := range current.MapKeys() {
-		v.traverseField(topStruct, currentStruct, current.MapIndex(key), errPrefix, errs, false, tag, fmt.Sprintf(mapIndexFieldName, name, key.Interface()))
+		v.traverseField(topStruct, currentStruct, current.MapIndex(key), errPrefix, errs, false, tag, fmt.Sprintf(mapIndexFieldName, name, key.Interface()), partial, exclude, includeExclude)
 	}
 }
 
@@ -491,7 +543,7 @@ func (v *Validate) validateField(topStruct reflect.Value, currentStruct reflect.
 				panic(strings.TrimSpace(fmt.Sprintf(undefinedValidation, name)))
 			}
 
-			if valFunc(topStruct, currentStruct, current, currentType, currentKind, val[1]) {
+			if valFunc(v, topStruct, currentStruct, current, currentType, currentKind, val[1]) {
 				return false
 			}
 
@@ -514,7 +566,7 @@ func (v *Validate) validateField(topStruct reflect.Value, currentStruct reflect.
 		panic(strings.TrimSpace(fmt.Sprintf(undefinedValidation, name)))
 	}
 
-	if valFunc(topStruct, currentStruct, current, currentType, currentKind, cTag.tagVals[0][1]) {
+	if valFunc(v, topStruct, currentStruct, current, currentType, currentKind, cTag.tagVals[0][1]) {
 		return false
 	}