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strings.go
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/
strings.go
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// 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 (
"fmt"
"strings"
"github.com/open-policy-agent/opa/ast"
"github.com/pkg/errors"
)
func evalFormatInt(t *Topdown, expr *ast.Expr, iter Iterator) error {
ops := expr.Terms.([]*ast.Term)
input, err := ValueToJSONNumber(ops[1].Value, t)
if err != nil {
return errors.Wrapf(err, "%v: input must be a number", ast.FormatInt.Name)
}
i, _ := jsonNumberToFloat(input).Int(nil)
base, err := ValueToInt(ops[2].Value, t)
if err != nil {
return errors.Wrapf(err, "%v: base must be an integer", ast.FormatInt.Name)
}
var format string
switch base {
case 2:
format = "%b"
case 8:
format = "%o"
case 10:
format = "%d"
case 16:
format = "%x"
default:
return errors.Wrapf(err, "%v: base must be one of 2, 8, 10, 16", ast.FormatInt.Name)
}
s := ast.String(fmt.Sprintf(format, i))
undo, err := evalEqUnify(t, s, ops[3].Value, nil, iter)
t.Unbind(undo)
return err
}
func evalConcat(t *Topdown, expr *ast.Expr, iter Iterator) error {
ops := expr.Terms.([]*ast.Term)
join, err := ValueToString(ops[1].Value, t)
if err != nil {
return errors.Wrapf(err, "%v: join value must be a string", ast.Concat.Name)
}
sl, err := ValueToStrings(ops[2].Value, t)
if err != nil {
return errors.Wrapf(err, "%v: input value must be array of strings", ast.Concat.Name)
}
s := ast.String(strings.Join(sl, join))
undo, err := evalEqUnify(t, s, ops[3].Value, nil, iter)
t.Unbind(undo)
return err
}
func evalIndexOf(t *Topdown, expr *ast.Expr, iter Iterator) error {
ops := expr.Terms.([]*ast.Term)
base, err := ValueToString(ops[1].Value, t)
if err != nil {
return errors.Wrapf(err, "%v: base value must be a string", ast.IndexOf.Name)
}
search, err := ValueToString(ops[2].Value, t)
if err != nil {
return errors.Wrapf(err, "%v: search value must be a string", ast.IndexOf.Name)
}
index := ast.IntNumberTerm(strings.Index(base, search))
undo, err := evalEqUnify(t, index.Value, ops[3].Value, nil, iter)
t.Unbind(undo)
return err
}
func evalSubstring(t *Topdown, expr *ast.Expr, iter Iterator) error {
ops := expr.Terms.([]*ast.Term)
base, err := ValueToString(ops[1].Value, t)
if err != nil {
return errors.Wrapf(err, "%v: base value must be a string", ast.Substring.Name)
}
startIndex, err := ValueToInt(ops[2].Value, t)
if err != nil {
return errors.Wrapf(err, "%v: start index must be a number", ast.Substring.Name)
}
l, err := ValueToInt(ops[3].Value, t)
if err != nil {
return errors.Wrapf(err, "%v: length must be a number", ast.Substring.Name)
}
var s ast.String
if l < 0 {
s = ast.String(base[startIndex:])
} else {
s = ast.String(base[startIndex : startIndex+l])
}
undo, err := evalEqUnify(t, s, ops[4].Value, nil, iter)
t.Unbind(undo)
return err
}
func evalContains(t *Topdown, expr *ast.Expr, iter Iterator) error {
ops := expr.Terms.([]*ast.Term)
base, err := ValueToString(ops[1].Value, t)
if err != nil {
return errors.Wrapf(err, "%v: base value must be a string", ast.Contains.Name)
}
search, err := ValueToString(ops[2].Value, t)
if err != nil {
return errors.Wrapf(err, "%v: search must be a string", ast.Contains.Name)
}
if strings.Contains(base, search) {
return iter(t)
}
return nil
}
func evalStartsWith(t *Topdown, expr *ast.Expr, iter Iterator) error {
ops := expr.Terms.([]*ast.Term)
base, err := ValueToString(ops[1].Value, t)
if err != nil {
return errors.Wrapf(err, "%v: base value must be a string", ast.StartsWith.Name)
}
search, err := ValueToString(ops[2].Value, t)
if err != nil {
return errors.Wrapf(err, "%v: search must be a string", ast.StartsWith.Name)
}
if strings.HasPrefix(base, search) {
return iter(t)
}
return nil
}
func evalEndsWith(t *Topdown, expr *ast.Expr, iter Iterator) error {
ops := expr.Terms.([]*ast.Term)
base, err := ValueToString(ops[1].Value, t)
if err != nil {
return errors.Wrapf(err, "%v: base value must be a string", ast.EndsWith.Name)
}
search, err := ValueToString(ops[2].Value, t)
if err != nil {
return errors.Wrapf(err, "%v: search must be a string", ast.EndsWith.Name)
}
if strings.HasSuffix(base, search) {
return iter(t)
}
return nil
}
func evalLower(t *Topdown, expr *ast.Expr, iter Iterator) error {
ops := expr.Terms.([]*ast.Term)
orig, err := ValueToString(ops[1].Value, t)
if err != nil {
return errors.Wrapf(err, "%v: original value must be a string", ast.Lower.Name)
}
s := ast.String(strings.ToLower(orig))
undo, err := evalEqUnify(t, s, ops[2].Value, nil, iter)
t.Unbind(undo)
return err
}
func evalUpper(t *Topdown, expr *ast.Expr, iter Iterator) error {
ops := expr.Terms.([]*ast.Term)
orig, err := ValueToString(ops[1].Value, t)
if err != nil {
return errors.Wrapf(err, "%v: original value must be a string", ast.Upper.Name)
}
s := ast.String(strings.ToUpper(orig))
undo, err := evalEqUnify(t, s, ops[2].Value, nil, iter)
t.Unbind(undo)
return err
}