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137 lines
3.3 KiB
Go
137 lines
3.3 KiB
Go
// Copyright 2019 Jimmy Zelinskie
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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 stringz implements a collection of utility functions for
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// manipulating strings and lists of strings.
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package stringz
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import "strings"
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// SliceContains returns true if the provided string is in the provided string
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// slice.
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func SliceContains(ys []string, x string) bool {
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for _, y := range ys {
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if x == y {
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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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// Dedup returns a new slice with any duplicates removed.
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func Dedup(xs []string) []string {
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set := make(map[string]struct{}, 0)
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ys := make([]string, 0, len(xs))
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for _, x := range xs {
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if _, alreadyExists := set[x]; alreadyExists {
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continue
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}
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ys = append(ys, x)
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set[x] = struct{}{}
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}
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return ys
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}
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// DefaultEmpty returns the fallback when val is empty string.
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//
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// This function is inspired by Python's `dict.get()`.
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func DefaultEmpty(val, fallback string) string {
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return Default(val, fallback, "")
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}
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// Default returns a fallback value when the provided value is equal to any
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// of the zero values.
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func Default(val, fallback string, zeroValues ...string) string {
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for _, zeroValue := range zeroValues {
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if val == zeroValue {
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return fallback
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}
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}
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return val
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}
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// SliceEqual returns true if two string slices are the same.
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func SliceEqual(xs, ys []string) bool {
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if len(xs) != len(ys) {
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return false
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}
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for i, x := range xs {
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if x != ys[i] {
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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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// TrimPrefixIndex trims everything before the provided index.
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func TrimPrefixIndex(s, index string) string {
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i := strings.Index(s, index)
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if i <= 0 {
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return s
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}
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return s[i+len(index):]
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}
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// TrimSurrounding returns a string with both a prefix and suffix trimmed from
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// it.
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//
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// Do not confuse this with strings.Trim() which removes characters in a cutset
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// rather than working on prefixes and suffixes.
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func TrimSurrounding(s, surrounding string) string {
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s = strings.TrimPrefix(s, surrounding)
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return strings.TrimSuffix(s, surrounding)
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}
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// SliceMap is a functional-style mapping function for slices of strings.
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//
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// This is particularly useful when you would normally use a for-loop, but want
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// `defer` to execute for each iteration.
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func SliceMap(xs []string, fn func(string) error) error {
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for _, x := range xs {
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err := fn(x)
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if err != nil {
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return err
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}
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}
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return nil
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}
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// Join is strings.Join, but variadic.
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func Join(prefix string, xs ...string) string { return strings.Join(xs, prefix) }
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// CopyStringMap returns a new copy of a map of strings.
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func CopyStringMap(xs map[string]string) map[string]string {
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// Zero allocation path.
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if xs == nil {
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return nil
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}
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ys := make(map[string]string, len(xs))
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for k, v := range xs {
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ys[k] = v
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}
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return ys
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}
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// Unpack assigns a slice into local variables.
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func Unpack(xs []string, vars ...*string) {
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for i, x := range xs {
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*vars[i] = x
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}
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}
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