477a1cc40e
- Move the file `compare.go` and `slice.go` to `slice.go`.
- Fix `ExistsInSlice`, it's buggy
- It uses `sort.Search`, so it assumes that the input slice is sorted.
- It passes `func(i int) bool { return slice[i] == target })` to
`sort.Search`, that's incorrect, check the doc of `sort.Search`.
- Conbine `IsInt64InSlice(int64, []int64)` and `ExistsInSlice(string,
[]string)` to `SliceContains[T]([]T, T)`.
- Conbine `IsSliceInt64Eq([]int64, []int64)` and `IsEqualSlice([]string,
[]string)` to `SliceSortedEqual[T]([]T, T)`.
- Add `SliceEqual[T]([]T, T)` as a distinction from
`SliceSortedEqual[T]([]T, T)`.
- Redesign `RemoveIDFromList([]int64, int64) ([]int64, bool)` to
`SliceRemoveAll[T]([]T, T) []T`.
- Add `SliceContainsFunc[T]([]T, func(T) bool)` and
`SliceRemoveAllFunc[T]([]T, func(T) bool)` for general use.
- Add comments to explain why not `golang.org/x/exp/slices`.
- Add unit tests.
90 lines
2.4 KiB
Go
90 lines
2.4 KiB
Go
// Copyright 2022 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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// Most of the functions in this file can have better implementations with "golang.org/x/exp/slices".
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// However, "golang.org/x/exp" is experimental and unreliable, we shouldn't use it.
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// So lets waiting for the "slices" has be promoted to the main repository one day.
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package util
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import "strings"
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// SliceContains returns true if the target exists in the slice.
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func SliceContains[T comparable](slice []T, target T) bool {
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return SliceContainsFunc(slice, func(t T) bool { return t == target })
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}
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// SliceContainsFunc returns true if any element in the slice satisfies the targetFunc.
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func SliceContainsFunc[T any](slice []T, targetFunc func(T) bool) bool {
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for _, v := range slice {
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if targetFunc(v) {
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return true
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}
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}
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return false
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}
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// SliceContainsString sequential searches if string exists in slice.
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func SliceContainsString(slice []string, target string, insensitive ...bool) bool {
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if len(insensitive) != 0 && insensitive[0] {
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target = strings.ToLower(target)
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return SliceContainsFunc(slice, func(t string) bool { return strings.ToLower(t) == target })
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}
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return SliceContains(slice, target)
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}
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// SliceSortedEqual returns true if the two slices will be equal when they get sorted.
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// It doesn't require that the slices have been sorted, and it doesn't sort them either.
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func SliceSortedEqual[T comparable](s1, s2 []T) bool {
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if len(s1) != len(s2) {
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return false
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}
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counts := make(map[T]int, len(s1))
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for _, v := range s1 {
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counts[v]++
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}
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for _, v := range s2 {
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counts[v]--
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}
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for _, v := range counts {
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if v != 0 {
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return false
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}
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}
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return true
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}
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// SliceEqual returns true if the two slices are equal.
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func SliceEqual[T comparable](s1, s2 []T) bool {
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if len(s1) != len(s2) {
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return false
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}
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for i, v := range s1 {
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if s2[i] != v {
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return false
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}
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}
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return true
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}
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// SliceRemoveAll removes all the target elements from the slice.
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func SliceRemoveAll[T comparable](slice []T, target T) []T {
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return SliceRemoveAllFunc(slice, func(t T) bool { return t == target })
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}
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// SliceRemoveAllFunc removes all elements which satisfy the targetFunc from the slice.
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func SliceRemoveAllFunc[T comparable](slice []T, targetFunc func(T) bool) []T {
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idx := 0
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for _, v := range slice {
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if targetFunc(v) {
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continue
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}
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slice[idx] = v
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idx++
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}
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return slice[:idx]
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}
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