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70 lines
1.8 KiB
70 lines
1.8 KiB
// Copyright 2017 clair authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package strutil
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import (
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"regexp"
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set "github.com/deckarep/golang-set"
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)
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var urlParametersRegexp = regexp.MustCompile(`(\?|\&)([^=]+)\=([^ &]+)`)
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func convertToSet(X []string) set.Set {
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s := set.NewSet()
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for _, x := range X {
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s.Add(x)
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}
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return s
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}
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func setToStringSlice(s set.Set) []string {
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strs := make([]string, 0, s.Cardinality())
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for _, str := range s.ToSlice() {
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strs = append(strs, str.(string))
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}
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return strs
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}
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// Difference returns the strings that are present in X but not in Y.
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func Difference(X, Y []string) []string {
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x := convertToSet(X)
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y := convertToSet(Y)
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return setToStringSlice(x.Difference(y))
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}
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// Intersect returns the strings that are present in both X and Y.
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func Intersect(X, Y []string) []string {
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x := convertToSet(X)
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y := convertToSet(Y)
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return setToStringSlice(x.Intersect(y))
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}
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// CleanURL removes all parameters from an URL.
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func CleanURL(str string) string {
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return urlParametersRegexp.ReplaceAllString(str, "")
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}
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// Substring returns a substring by [start, end). If start or end are out
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// of bound, it returns "".
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func Substring(s string, start, end int) string {
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if start > len(s) || start < 0 || end > len(s) || end < 0 || start >= end {
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return ""
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}
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return s[start:end]
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}
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