validation.newCountableValidator - Code Metrics - Inspection of "violation-linked-list" - muonsoft/validation - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Pull Request — main (#52)

by Igor

created 2021-05-24 16:28 UTC

validation.newCountableValidator A

↳ Parent: validation.go

Complexity

Conditions

Size

Total Lines	7
Code Lines	5

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	4
CRAP Score	3

Importance

Changes

Metric	Value
cc	3
eloc	5
dl	0
loc	7
ccs	4
cts	4
cp	1
crap	3
rs	10
c	0
b	0
f	0
nop	2

// Copyright 2021 Igor Lazarev. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

// Package validation provides tools for data validation.
// It is designed to create complex validation rules with abilities to hook into the validation process.
package validation

import (
	"reflect"
	"time"

	"github.com/muonsoft/validation/generic"
)

// Validatable is interface for creating validatable types on the client side.
// By using it you can build complex validation rules on a set of objects used in other objects.
//
// Example
//  type Book struct {
//      Title    string
//      Author   string
//      Keywords []string
//  }
//
//  func (b Book) Validate(validator *validation.Validator) error {
//      return validator.Validate(
//          validation.StringProperty("title", &b.Title, it.IsNotBlank()),
//          validation.StringProperty("author", &b.Author, it.IsNotBlank()),
//          validation.CountableProperty("keywords", len(b.Keywords), it.HasCountBetween(1, 10)),
//          validation.EachStringProperty("keywords", b.Keywords, it.IsNotBlank()),
//      )
//  }
type Validatable interface {
	Validate(validator *Validator) error
}

// Filter is used for processing the list of errors to return a single ViolationList.
// If there is at least one non-violation error it will return it instead.
func Filter(violations ...error) error {
	return nil
	// filteredViolations := make(ViolationList, 0, len(violations))
	//
	// for _, err := range violations {
	// 	addErr := filteredViolations.AppendFromError(err)
	// 	if addErr != nil {
	// 		return addErr
	// 	}
	// }
	//
	// return filteredViolations.AsError()
}

// ValidateByConstraintFunc is used for building validation functions for the values of specific types.
type ValidateByConstraintFunc func(constraint Constraint, scope Scope) error

type validateFunc func(scope Scope) (*ViolationList, error)

var validatableType = reflect.TypeOf((*Validatable)(nil)).Elem()

func newValueValidator(value interface{}, options []Option) (validateFunc, error) {
	switch v := value.(type) {
	case Validatable:
		return newValidValidator(v, options), nil
	case time.Time:
		return newTimeValidator(&v, options), nil
	case *time.Time:
		return newTimeValidator(v, options), nil
	}

	v := reflect.ValueOf(value)

	switch v.Kind() {
	case reflect.Ptr:
		return newValuePointerValidator(v, options)
	case reflect.Bool:
		b := v.Bool()
		return newBoolValidator(&b, options), nil
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
		reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64,
		reflect.Float32, reflect.Float64:
		n, err := generic.NewNumber(value)
		if err != nil {
			return nil, err
		}

		return newNumberValidator(*n, options), nil
	case reflect.String:
		s := v.String()
		return newStringValidator(&s, options), nil
	case reflect.Array, reflect.Slice, reflect.Map:
		i, err := generic.NewIterable(value)
		if err != nil {
			return nil, err
		}

		return newIterableValidator(i, options), nil
	}

	return nil, &NotValidatableError{Value: v}
}

func newValuePointerValidator(value reflect.Value, options []Option) (validateFunc, error) {
	p := value.Elem()
	if value.IsNil() {
		return newNilValidator(options), nil
	}

	switch p.Kind() {
	case reflect.Bool:
		b := p.Bool()
		return newBoolValidator(&b, options), nil
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
		reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64,
		reflect.Float32, reflect.Float64:
		n, err := generic.NewNumber(p.Interface())
		if err != nil {
			return nil, err
		}

		return newNumberValidator(*n, options), nil
	case reflect.String:
		s := p.String()
		return newStringValidator(&s, options), nil
	case reflect.Array, reflect.Slice, reflect.Map:
		i, err := generic.NewIterable(p.Interface())
		if err != nil {
			return nil, err
		}

		return newIterableValidator(i, options), nil
	}

	return nil, &NotValidatableError{Value: value}
}

func newNilValidator(options []Option) validateFunc {
	return newValidator(options, func(constraint Constraint, scope Scope) error {
		if constraintValidator, ok := constraint.(NilConstraint); ok {
			return constraintValidator.ValidateNil(scope)
		}

		return nil
	})
}

func newBoolValidator(value *bool, options []Option) validateFunc {
	return newValidator(options, func(constraint Constraint, scope Scope) error {
		if c, ok := constraint.(BoolConstraint); ok {
			return c.ValidateBool(value, scope)
		}

		return NewInapplicableConstraintError(constraint, "bool")
	})
}

func newNumberValidator(value generic.Number, options []Option) validateFunc {
	return newValidator(options, func(constraint Constraint, scope Scope) error {
		if c, ok := constraint.(NumberConstraint); ok {
			return c.ValidateNumber(value, scope)
		}

		return NewInapplicableConstraintError(constraint, "number")
	})
}

func newStringValidator(value *string, options []Option) validateFunc {
	return newValidator(options, func(constraint Constraint, scope Scope) error {
		if c, ok := constraint.(StringConstraint); ok {
			return c.ValidateString(value, scope)
		}

		return NewInapplicableConstraintError(constraint, "string")
	})
}

func newIterableValidator(iterable generic.Iterable, options []Option) validateFunc {
	return func(scope Scope) (*ViolationList, error) {
		err := scope.applyOptions(options...)
		if err != nil {
			return nil, err
		}

		violations, err := validateOnScope(scope, options, func(constraint Constraint, scope Scope) error {
			if c, ok := constraint.(IterableConstraint); ok {
				return c.ValidateIterable(iterable, scope)
			}

			return NewInapplicableConstraintError(constraint, "iterable")
		})
		if err != nil {
			return nil, err
		}

		if iterable.IsElementImplements(validatableType) {
			vs, err := validateIterableOfValidatables(scope, iterable)
			if err != nil {
				return nil, err
			}
			violations.Join(vs)
		}

		return violations, nil
	}
}

func newCountableValidator(count int, options []Option) validateFunc {
	return newValidator(options, func(constraint Constraint, scope Scope) error {
		if c, ok := constraint.(CountableConstraint); ok {
			return c.ValidateCountable(count, scope)
		}

		return NewInapplicableConstraintError(constraint, "countable")
	})
}

func newTimeValidator(value *time.Time, options []Option) validateFunc {
	return newValidator(options, func(constraint Constraint, scope Scope) error {
		if c, ok := constraint.(TimeConstraint); ok {
			return c.ValidateTime(value, scope)
		}

		return NewInapplicableConstraintError(constraint, "time")
	})
}

func newEachValidator(iterable generic.Iterable, options []Option) validateFunc {
	return func(scope Scope) (*ViolationList, error) {
		violations := &ViolationList{}

		err := iterable.Iterate(func(key generic.Key, value interface{}) error {
			opts := options
			if key.IsIndex() {
				opts = append(opts, ArrayIndex(key.Index()))
			} else {
				opts = append(opts, PropertyName(key.String()))
			}

			validate, err := newValueValidator(value, opts)
			if err != nil {
				return err
			}

			vs, err := validate(scope)
			if err != nil {
				return err
			}
			violations.Join(vs)

			return nil
		})

		return violations, err
	}
}

func newEachStringValidator(values []string, options []Option) validateFunc {
	return func(scope Scope) (*ViolationList, error) {
		violations := &ViolationList{}

		for i := range values {
			opts := append(options, ArrayIndex(i))
			validate := newStringValidator(&values[i], opts)
			vs, err := validate(scope)
			if err != nil {
				return nil, err
			}
			violations.Join(vs)
		}

		return violations, nil
	}
}

func newValidValidator(value Validatable, options []Option) validateFunc {
	return func(scope Scope) (*ViolationList, error) {
		err := scope.applyOptions(options...)
		if err != nil {
			return nil, err
		}

		err = value.Validate(newScopedValidator(scope))
		violations, ok := UnwrapViolationList(err)
		if ok {
			return violations, nil
		}

		return nil, err
	}
}

func newValidator(options []Option, validate ValidateByConstraintFunc) validateFunc {
	return func(scope Scope) (*ViolationList, error) {
		err := scope.applyOptions(options...)
		if err != nil {
			return nil, err
		}

		return validateOnScope(scope, options, validate)
	}
}

func validateOnScope(scope Scope, options []Option, validate ValidateByConstraintFunc) (*ViolationList, error) {
	violations := &ViolationList{}

	for _, option := range options {
		if constraint, ok := option.(controlConstraint); ok {
			vs, err := constraint.validate(scope, validate)
			if err != nil {
				return nil, err
			}

			violations.Join(vs)
		} else if constraint, ok := option.(Constraint); ok {
			err := violations.AppendFromError(validate(constraint, scope))
			if err != nil {
				return nil, err
			}
		}
	}

	return violations, nil
}

func validateIterableOfValidatables(scope Scope, iterable generic.Iterable) (*ViolationList, error) {
	violations := &ViolationList{}

	err := iterable.Iterate(func(key generic.Key, value interface{}) error {
		s := scope
		if key.IsIndex() {
			s = s.atIndex(key.Index())
		} else {
			s = s.atProperty(key.String())
		}

		validate := newValidValidator(value.(Validatable), nil)
		vs, err := validate(s)
		if err != nil {
			return err
		}

		violations.Join(vs)

		return nil
	})

	return violations, err
}


1		// Copyright 2021 Igor Lazarev. All rights reserved.
2		// Use of this source code is governed by a MIT-style
3		// license that can be found in the LICENSE file.
4
5		// Package validation provides tools for data validation.
6		// It is designed to create complex validation rules with abilities to hook into the validation process.
7		package validation
8
9		import (
10		"reflect"
11		"time"
12
13		"github.com/muonsoft/validation/generic"
14		)
15
16		// Validatable is interface for creating validatable types on the client side.
17		// By using it you can build complex validation rules on a set of objects used in other objects.
18		//
19		// Example
20		// type Book struct {
21		// Title string
22		// Author string
23		// Keywords []string
24		// }
25		//
26		// func (b Book) Validate(validator *validation.Validator) error {
27		// return validator.Validate(
28		// validation.StringProperty("title", &b.Title, it.IsNotBlank()),
29		// validation.StringProperty("author", &b.Author, it.IsNotBlank()),
30		// validation.CountableProperty("keywords", len(b.Keywords), it.HasCountBetween(1, 10)),
31		// validation.EachStringProperty("keywords", b.Keywords, it.IsNotBlank()),
32		// )
33		// }
34		type Validatable interface {
35		Validate(validator *Validator) error
36		}
37
38		// Filter is used for processing the list of errors to return a single ViolationList.
39		// If there is at least one non-violation error it will return it instead.
40		func Filter(violations ...error) error {
41	1	return nil
42		// filteredViolations := make(ViolationList, 0, len(violations))
43		//
44		// for _, err := range violations {
45		// addErr := filteredViolations.AppendFromError(err)
46		// if addErr != nil {
47		// return addErr
48		// }
49		// }
50		//
51		// return filteredViolations.AsError()
52		}
53
54		// ValidateByConstraintFunc is used for building validation functions for the values of specific types.
55		type ValidateByConstraintFunc func(constraint Constraint, scope Scope) error
56
57		type validateFunc func(scope Scope) (*ViolationList, error)
58
59		var validatableType = reflect.TypeOf((*Validatable)(nil)).Elem()
60
61		func newValueValidator(value interface{}, options []Option) (validateFunc, error) {
62	1	switch v := value.(type) {
63		case Validatable:
64	1	return newValidValidator(v, options), nil
65		case time.Time:
66	1	return newTimeValidator(&v, options), nil
67		case *time.Time:
68	1	return newTimeValidator(v, options), nil
69		}
70
71	1	v := reflect.ValueOf(value)
72
73	1	switch v.Kind() {
74		case reflect.Ptr:
75	1	return newValuePointerValidator(v, options)
76		case reflect.Bool:
77	1	b := v.Bool()
78	1	return newBoolValidator(&b, options), nil
79		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
80		reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64,
81		reflect.Float32, reflect.Float64:
82	1	n, err := generic.NewNumber(value)
83	1	if err != nil {
84		return nil, err
85		}
86
87	1	return newNumberValidator(*n, options), nil
88		case reflect.String:
89	1	s := v.String()
90	1	return newStringValidator(&s, options), nil
91		case reflect.Array, reflect.Slice, reflect.Map:
92	1	i, err := generic.NewIterable(value)
93	1	if err != nil {
94		return nil, err
95		}
96
97	1	return newIterableValidator(i, options), nil
98		}
99
100	1	return nil, &NotValidatableError{Value: v}
101		}
102
103		func newValuePointerValidator(value reflect.Value, options []Option) (validateFunc, error) {
104	1	p := value.Elem()
105	1	if value.IsNil() {
106	1	return newNilValidator(options), nil
107		}
108
109	1	switch p.Kind() {
110		case reflect.Bool:
111	1	b := p.Bool()
112	1	return newBoolValidator(&b, options), nil
113		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
114		reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64,
115		reflect.Float32, reflect.Float64:
116	1	n, err := generic.NewNumber(p.Interface())
117	1	if err != nil {
118		return nil, err
119		}
120
121	1	return newNumberValidator(*n, options), nil
122		case reflect.String:
123	1	s := p.String()
124	1	return newStringValidator(&s, options), nil
125		case reflect.Array, reflect.Slice, reflect.Map:
126	1	i, err := generic.NewIterable(p.Interface())
127	1	if err != nil {
128		return nil, err
129		}
130
131	1	return newIterableValidator(i, options), nil
132		}
133
134		return nil, &NotValidatableError{Value: value}
135		}
136
137		func newNilValidator(options []Option) validateFunc {
138	1	return newValidator(options, func(constraint Constraint, scope Scope) error {
139	1	if constraintValidator, ok := constraint.(NilConstraint); ok {
140	1	return constraintValidator.ValidateNil(scope)
141		}
142
143		return nil
144		})
145		}
146
147		func newBoolValidator(value *bool, options []Option) validateFunc {
148	1	return newValidator(options, func(constraint Constraint, scope Scope) error {
149	1	if c, ok := constraint.(BoolConstraint); ok {
150	1	return c.ValidateBool(value, scope)
151		}
152
153	1	return NewInapplicableConstraintError(constraint, "bool")
154		})
155		}
156
157		func newNumberValidator(value generic.Number, options []Option) validateFunc {
158	1	return newValidator(options, func(constraint Constraint, scope Scope) error {
159	1	if c, ok := constraint.(NumberConstraint); ok {
160	1	return c.ValidateNumber(value, scope)
161		}
162
163	1	return NewInapplicableConstraintError(constraint, "number")
164		})
165		}
166
167		func newStringValidator(value *string, options []Option) validateFunc {
168	1	return newValidator(options, func(constraint Constraint, scope Scope) error {
169	1	if c, ok := constraint.(StringConstraint); ok {
170	1	return c.ValidateString(value, scope)
171		}
172
173	1	return NewInapplicableConstraintError(constraint, "string")
174		})
175		}
176
177		func newIterableValidator(iterable generic.Iterable, options []Option) validateFunc {
178	1	return func(scope Scope) (*ViolationList, error) {
179	1	err := scope.applyOptions(options...)
180	1	if err != nil {
181		return nil, err
182		}
183
184	1	violations, err := validateOnScope(scope, options, func(constraint Constraint, scope Scope) error {
185	1	if c, ok := constraint.(IterableConstraint); ok {
186	1	return c.ValidateIterable(iterable, scope)
187		}
188
189	1	return NewInapplicableConstraintError(constraint, "iterable")
190		})
191	1	if err != nil {
192	1	return nil, err
193		}
194
195	1	if iterable.IsElementImplements(validatableType) {
196	1	vs, err := validateIterableOfValidatables(scope, iterable)
197	1	if err != nil {
198		return nil, err
199		}
200	1	violations.Join(vs)
201		}
202
203	1	return violations, nil
204		}
205		}
206
207		func newCountableValidator(count int, options []Option) validateFunc {
208	1	return newValidator(options, func(constraint Constraint, scope Scope) error {
209	1	if c, ok := constraint.(CountableConstraint); ok {
210	1	return c.ValidateCountable(count, scope)
211		}
212
213	1	return NewInapplicableConstraintError(constraint, "countable")
214		})
215		}
216
217		func newTimeValidator(value *time.Time, options []Option) validateFunc {
218	1	return newValidator(options, func(constraint Constraint, scope Scope) error {
219	1	if c, ok := constraint.(TimeConstraint); ok {
220	1	return c.ValidateTime(value, scope)
221		}
222
223	1	return NewInapplicableConstraintError(constraint, "time")
224		})
225		}
226
227		func newEachValidator(iterable generic.Iterable, options []Option) validateFunc {
228	1	return func(scope Scope) (*ViolationList, error) {
229	1	violations := &ViolationList{}
230
231	1	err := iterable.Iterate(func(key generic.Key, value interface{}) error {
232	1	opts := options
233	1	if key.IsIndex() {
234	1	opts = append(opts, ArrayIndex(key.Index()))
235		} else {
236	1	opts = append(opts, PropertyName(key.String()))
237		}
238
239	1	validate, err := newValueValidator(value, opts)
240	1	if err != nil {
241		return err
242		}
243
244	1	vs, err := validate(scope)
245	1	if err != nil {
246		return err
247		}
248	1	violations.Join(vs)
249
250	1	return nil
251		})
252
253	1	return violations, err
254		}
255		}
256
257		func newEachStringValidator(values []string, options []Option) validateFunc {
258	1	return func(scope Scope) (*ViolationList, error) {
259	1	violations := &ViolationList{}
260
261	1	for i := range values {
262	1	opts := append(options, ArrayIndex(i))
263	1	validate := newStringValidator(&values[i], opts)
264	1	vs, err := validate(scope)
265	1	if err != nil {
266		return nil, err
267		}
268	1	violations.Join(vs)
269		}
270
271	1	return violations, nil
272		}
273		}
274
275		func newValidValidator(value Validatable, options []Option) validateFunc {
276	1	return func(scope Scope) (*ViolationList, error) {
277	1	err := scope.applyOptions(options...)
278	1	if err != nil {
279		return nil, err
280		}
281
282	1	err = value.Validate(newScopedValidator(scope))
283	1	violations, ok := UnwrapViolationList(err)
284	1	if ok {
285	1	return violations, nil
286		}
287
288	1	return nil, err
289		}
290		}
291
292		func newValidator(options []Option, validate ValidateByConstraintFunc) validateFunc {
293	1	return func(scope Scope) (*ViolationList, error) {
294	1	err := scope.applyOptions(options...)
295	1	if err != nil {
296	1	return nil, err
297		}
298
299	1	return validateOnScope(scope, options, validate)
300		}
301		}
302
303		func validateOnScope(scope Scope, options []Option, validate ValidateByConstraintFunc) (*ViolationList, error) {
304	1	violations := &ViolationList{}
305
306	1	for _, option := range options {
307	1	if constraint, ok := option.(controlConstraint); ok {
308	1	vs, err := constraint.validate(scope, validate)
309	1	if err != nil {
310		return nil, err
311		}
312
313	1	violations.Join(vs)
314	1	} else if constraint, ok := option.(Constraint); ok {
315	1	err := violations.AppendFromError(validate(constraint, scope))
316	1	if err != nil {
317	1	return nil, err
318		}
319		}
320		}
321
322	1	return violations, nil
323		}
324
325		func validateIterableOfValidatables(scope Scope, iterable generic.Iterable) (*ViolationList, error) {
326	1	violations := &ViolationList{}
327
328	1	err := iterable.Iterate(func(key generic.Key, value interface{}) error {
329	1	s := scope
330	1	if key.IsIndex() {
331	1	s = s.atIndex(key.Index())
332		} else {
333	1	s = s.atProperty(key.String())
334		}
335
336	1	validate := newValidValidator(value.(Validatable), nil)
337	1	vs, err := validate(s)
338	1	if err != nil {
339		return err
340		}
341
342	1	violations.Join(vs)
343
344	1	return nil
345		})
346
347	1	return violations, err
348		}
349

muonsoft / validation

Pull Request — main (#52)

validation.newCountableValidator A

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