/
array.go
77 lines (62 loc) · 1.68 KB
/
array.go
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// Copyright 2018 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 (
"github.com/open-policy-agent/opa/ast"
"github.com/open-policy-agent/opa/topdown/builtins"
)
func builtinArrayConcat(a, b ast.Value) (ast.Value, error) {
arrA, err := builtins.ArrayOperand(a, 1)
if err != nil {
return nil, err
}
arrB, err := builtins.ArrayOperand(b, 2)
if err != nil {
return nil, err
}
arrC := make([]*ast.Term, arrA.Len()+arrB.Len())
i := 0
arrA.Foreach(func(elemA *ast.Term) {
arrC[i] = elemA
i++
})
arrB.Foreach(func(elemB *ast.Term) {
arrC[i] = elemB
i++
})
return ast.NewArray(arrC...), nil
}
func builtinArraySlice(a, i, j ast.Value) (ast.Value, error) {
arr, err := builtins.ArrayOperand(a, 1)
if err != nil {
return nil, err
}
startIndex, err := builtins.IntOperand(i, 2)
if err != nil {
return nil, err
}
stopIndex, err := builtins.IntOperand(j, 3)
if err != nil {
return nil, err
}
// Clamp stopIndex to avoid out-of-range errors. If negative, clamp to zero.
// Otherwise, clamp to length of array.
if stopIndex < 0 {
stopIndex = 0
} else if stopIndex > arr.Len() {
stopIndex = arr.Len()
}
// Clamp startIndex to avoid out-of-range errors. If negative, clamp to zero.
// Otherwise, clamp to stopIndex to avoid to avoid cases like arr[1:0].
if startIndex < 0 {
startIndex = 0
} else if startIndex > stopIndex {
startIndex = stopIndex
}
return arr.Slice(startIndex, stopIndex), nil
}
func init() {
RegisterFunctionalBuiltin2(ast.ArrayConcat.Name, builtinArrayConcat)
RegisterFunctionalBuiltin3(ast.ArraySlice.Name, builtinArraySlice)
}