check/float.go at main · Alinxus/check · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
package check

import "fmt"

// FloatSchema validates float64 values.
type FloatSchema struct {
	optional   bool
	defaultVal *float64
	min        *float64
	max        *float64
	positive   bool
	negative   bool
	customFns  []func(float64) error
}

func NewFloat() *FloatSchema {
	return &FloatSchema{}
}

// clone returns a copy of this schema to preserve immutability in chains.
func (s *FloatSchema) clone() *FloatSchema {
	copy := *s
	if s.customFns != nil {
		copyCustom := make([]func(float64) error, len(s.customFns))
		for i, v := range s.customFns {
			copyCustom[i] = v
		}
		copy.customFns = copyCustom
	}
	return &copy
}

func (s *FloatSchema) Optional() *FloatSchema {
	s = s.clone()
	s.optional = true
	return s
}

func (s *FloatSchema) Default(v float64) *FloatSchema {
	s = s.clone()
	s.optional = true
	s.defaultVal = &v
	return s
}

func (s *FloatSchema) Min(n float64) *FloatSchema {
	s = s.clone()
	s.min = &n
	return s
}

func (s *FloatSchema) Max(n float64) *FloatSchema {
	s = s.clone()
	s.max = &n
	return s
}

func (s *FloatSchema) Positive() *FloatSchema {
	s = s.clone()
	s.positive = true
	return s
}

func (s *FloatSchema) Negative() *FloatSchema {
	s = s.clone()
	s.negative = true
	return s
}

func (s *FloatSchema) Custom(fn func(float64) error) *FloatSchema {
	s = s.clone()
	s.customFns = append(s.customFns, fn)
	return s
}

func (s *FloatSchema) IsOptional() bool { return s.optional }

func (s *FloatSchema) Parse(value any) (any, error) {
	errs := s.Validate(value)
	if len(errs) > 0 {
		return nil, ValidationErrors(errs)
	}
	if value == nil && s.defaultVal != nil {
		return *s.defaultVal, nil
	}
	if value == nil {
		return nil, nil
	}
	f, _ := toFloat64(value)
	return f, nil
}

func (s *FloatSchema) Validate(value any) []ValidationError {
	if value == nil {
		if s.optional {
			return nil
		}
		return []ValidationError{{Message: "required value is missing"}}
	}

	f, ok := toFloat64(value)
	if !ok {
		return []ValidationError{{Message: fmt.Sprintf("expected number, got %T", value), Value: value}}
	}

	var errs []ValidationError

	if s.min != nil && f < *s.min {
		errs = append(errs, ValidationError{
			Message: fmt.Sprintf("must be at least %g (got %g)", *s.min, f),
			Value:   f,
		})
	}

	if s.max != nil && f > *s.max {
		errs = append(errs, ValidationError{
			Message: fmt.Sprintf("must be at most %g (got %g)", *s.max, f),
			Value:   f,
		})
	}

	if s.positive && f <= 0 {
		errs = append(errs, ValidationError{
			Message: fmt.Sprintf("must be positive (got %g)", f),
			Value:   f,
		})
	}

	if s.negative && f >= 0 {
		errs = append(errs, ValidationError{
			Message: fmt.Sprintf("must be negative (got %g)", f),
			Value:   f,
		})
	}

	for _, fn := range s.customFns {
		if err := fn(f); err != nil {
			errs = append(errs, ValidationError{Message: err.Error(), Value: f})
		}
	}

	return errs
}