forked from casbin/casbin
/
util.go
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/
util.go
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// Copyright 2017 The casbin Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package util
import (
"regexp"
"sort"
"strings"
)
// EscapeAssertion escapes the dots in the assertion, because the expression evaluation doesn't support such variable names.
func EscapeAssertion(s string) string {
//Replace the first dot, because it can't be recognized by the regexp.
if (strings.HasPrefix(s, "r") || strings.HasPrefix(s, "p")) {
s = strings.Replace(s, ".", "_",1)
}
var regex = regexp.MustCompile(`(\|| |=|\)|\(|&|<|>|,|\+|-|!|\*|\/)(r|p)\.`)
s = regex.ReplaceAllStringFunc(s, func(m string) string {
return strings.Replace(m, ".", "_", 1)
})
return s
}
// RemoveComments removes the comments starting with # in the text.
func RemoveComments(s string) string {
pos := strings.Index(s, "#")
if pos == -1 {
return s
}
return strings.TrimSpace(s[0:pos])
}
// ArrayEquals determines whether two string arrays are identical.
func ArrayEquals(a []string, b []string) bool {
if len(a) != len(b) {
return false
}
for i, v := range a {
if v != b[i] {
return false
}
}
return true
}
// Array2DEquals determines whether two 2-dimensional string arrays are identical.
func Array2DEquals(a [][]string, b [][]string) bool {
if len(a) != len(b) {
return false
}
for i, v := range a {
if !ArrayEquals(v, b[i]) {
return false
}
}
return true
}
// ArrayRemoveDuplicates removes any duplicated elements in a string array.
func ArrayRemoveDuplicates(s *[]string) {
found := make(map[string]bool)
j := 0
for i, x := range *s {
if !found[x] {
found[x] = true
(*s)[j] = (*s)[i]
j++
}
}
*s = (*s)[:j]
}
// ArrayToString gets a printable string for a string array.
func ArrayToString(s []string) string {
return strings.Join(s, ", ")
}
// ParamsToString gets a printable string for variable number of parameters.
func ParamsToString(s ...string) string {
return strings.Join(s, ", ")
}
// SetEquals determines whether two string sets are identical.
func SetEquals(a []string, b []string) bool {
if len(a) != len(b) {
return false
}
sort.Strings(a)
sort.Strings(b)
for i, v := range a {
if v != b[i] {
return false
}
}
return true
}
// JoinSlice joins a string and a slice into a new slice.
func JoinSlice(a string, b ...string) []string {
res := make([]string, 0, len(b)+1)
res = append(res, a)
for _, s := range b {
res = append(res, s)
}
return res
}
// JoinSliceAny joins a string and a slice into a new interface{} slice.
func JoinSliceAny(a string, b ...string) []interface{} {
res := make([]interface{}, 0, len(b)+1)
res = append(res, a)
for _, s := range b {
res = append(res, s)
}
return res
}
// SetSubtract returns the elements in `a` that aren't in `b`.
func SetSubtract(a []string, b []string) []string {
mb := make(map[string]struct{}, len(b))
for _, x := range b {
mb[x] = struct{}{}
}
var diff []string
for _, x := range a {
if _, found := mb[x]; !found {
diff = append(diff, x)
}
}
return diff
}