forked from open-policy-agent/opa
-
Notifications
You must be signed in to change notification settings - Fork 0
/
aggregates.go
151 lines (139 loc) · 4.02 KB
/
aggregates.go
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
144
145
146
147
148
149
150
151
// Copyright 2016 The OPA Authors. All rights reserved.
// Use of this source code is governed by an Apache2
// license that can be found in the LICENSE file.
package topdown
import (
"math/big"
"github.com/open-policy-agent/opa/ast"
"github.com/open-policy-agent/opa/topdown/builtins"
)
func builtinCount(a ast.Value) (ast.Value, error) {
switch a := a.(type) {
case ast.Array:
return ast.IntNumberTerm(len(a)).Value, nil
case ast.Object:
return ast.IntNumberTerm(len(a)).Value, nil
case *ast.Set:
return ast.IntNumberTerm(len(*a)).Value, nil
case ast.String:
return ast.IntNumberTerm(len(a)).Value, nil
}
return nil, builtins.NewOperandTypeErr(1, a, ast.ArrayTypeName, ast.ObjectTypeName, ast.SetTypeName)
}
func builtinSum(a ast.Value) (ast.Value, error) {
switch a := a.(type) {
case ast.Array:
sum := big.NewFloat(0)
for _, x := range a {
n, ok := x.Value.(ast.Number)
if !ok {
return nil, builtins.NewOperandElementErr(1, a, x.Value, ast.NumberTypeName)
}
sum = new(big.Float).Add(sum, builtins.NumberToFloat(n))
}
return builtins.FloatToNumber(sum), nil
case *ast.Set:
sum := big.NewFloat(0)
for _, x := range *a {
n, ok := x.Value.(ast.Number)
if !ok {
return nil, builtins.NewOperandElementErr(1, a, x.Value, ast.NumberTypeName)
}
sum = new(big.Float).Add(sum, builtins.NumberToFloat(n))
}
return builtins.FloatToNumber(sum), nil
}
return nil, builtins.NewOperandTypeErr(1, a, ast.SetTypeName, ast.ArrayTypeName)
}
func builtinProduct(a ast.Value) (ast.Value, error) {
switch a := a.(type) {
case ast.Array:
product := big.NewFloat(1)
for _, x := range a {
n, ok := x.Value.(ast.Number)
if !ok {
return nil, builtins.NewOperandElementErr(1, a, x.Value, ast.NumberTypeName)
}
product = new(big.Float).Mul(product, builtins.NumberToFloat(n))
}
return builtins.FloatToNumber(product), nil
case *ast.Set:
product := big.NewFloat(1)
for _, x := range *a {
n, ok := x.Value.(ast.Number)
if !ok {
return nil, builtins.NewOperandElementErr(1, a, x.Value, ast.NumberTypeName)
}
product = new(big.Float).Mul(product, builtins.NumberToFloat(n))
}
return builtins.FloatToNumber(product), nil
}
return nil, builtins.NewOperandTypeErr(1, a, ast.SetTypeName, ast.ArrayTypeName)
}
func builtinMax(a ast.Value) (ast.Value, error) {
switch a := a.(type) {
case ast.Array:
if len(a) == 0 {
return nil, BuiltinEmpty{}
}
var max ast.Value = ast.Null{}
for i := range a {
if ast.Compare(max, a[i].Value) <= 0 {
max = a[i].Value
}
}
return max, nil
case *ast.Set:
if len(*a) == 0 {
return nil, BuiltinEmpty{}
}
max, err := a.Reduce(ast.NullTerm(), func(max *ast.Term, elem *ast.Term) (*ast.Term, error) {
if ast.Compare(max, elem) <= 0 {
return elem, nil
}
return max, nil
})
return max.Value, err
}
return nil, builtins.NewOperandTypeErr(1, a, ast.SetTypeName, ast.ArrayTypeName)
}
func builtinMin(a ast.Value) (ast.Value, error) {
switch a := a.(type) {
case ast.Array:
if len(a) == 0 {
return nil, BuiltinEmpty{}
}
min := a[0].Value
for i := range a {
if ast.Compare(min, a[i].Value) >= 0 {
min = a[i].Value
}
}
return min, nil
case *ast.Set:
if len(*a) == 0 {
return nil, BuiltinEmpty{}
}
min, err := a.Reduce(ast.NullTerm(), func(min *ast.Term, elem *ast.Term) (*ast.Term, error) {
// The null term is considered to be less than any other term,
// so in order for min of a set to make sense, we need to check
// for it.
if min.Value.Compare(ast.Null{}) == 0 {
return elem, nil
}
if ast.Compare(min, elem) >= 0 {
return elem, nil
}
return min, nil
})
return min.Value, err
}
return nil, builtins.NewOperandTypeErr(1, a, ast.SetTypeName, ast.ArrayTypeName)
}
func init() {
RegisterFunctionalBuiltin1(ast.Count.Name, builtinCount)
RegisterFunctionalBuiltin1(ast.Sum.Name, builtinSum)
RegisterFunctionalBuiltin1(ast.Product.Name, builtinProduct)
RegisterFunctionalBuiltin1(ast.Max.Name, builtinMax)
RegisterFunctionalBuiltin1(ast.Min.Name, builtinMin)
}