mirror of
https://github.com/gohugoio/hugo.git
synced 2024-12-26 01:12:10 +00:00
e197c7b29d
To sort an image's colors from darkest to lightest, you can then do:
```handlebars
{{ {{ $colorsByLuminance := sort $image.Colors "Luminance" }}
```
This uses the formula defined here: https://www.w3.org/TR/WCAG21/#dfn-relative-luminance
Fixes #10450
143 lines
3.5 KiB
Go
143 lines
3.5 KiB
Go
// Copyright 2024 The Hugo Authors. All rights reserved.
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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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// 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 hstrings
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import (
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"fmt"
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"regexp"
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"strings"
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"sync"
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"github.com/gohugoio/hugo/compare"
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)
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var _ compare.Eqer = StringEqualFold("")
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// StringEqualFold is a string that implements the compare.Eqer interface and considers
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// two strings equal if they are equal when folded to lower case.
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// The compare.Eqer interface is used in Hugo to compare values in templates (e.g. using the eq template function).
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type StringEqualFold string
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func (s StringEqualFold) EqualFold(s2 string) bool {
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return strings.EqualFold(string(s), s2)
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}
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func (s StringEqualFold) String() string {
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return string(s)
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}
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func (s StringEqualFold) Eq(s2 any) bool {
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switch ss := s2.(type) {
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case string:
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return s.EqualFold(ss)
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case fmt.Stringer:
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return s.EqualFold(ss.String())
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}
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return false
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}
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// EqualAny returns whether a string is equal to any of the given strings.
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func EqualAny(a string, b ...string) bool {
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for _, s := range b {
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if a == s {
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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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// regexpCache represents a cache of regexp objects protected by a mutex.
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type regexpCache struct {
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mu sync.RWMutex
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re map[string]*regexp.Regexp
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}
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func (rc *regexpCache) getOrCompileRegexp(pattern string) (re *regexp.Regexp, err error) {
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var ok bool
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if re, ok = rc.get(pattern); !ok {
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re, err = regexp.Compile(pattern)
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if err != nil {
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return nil, err
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}
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rc.set(pattern, re)
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}
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return re, nil
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}
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func (rc *regexpCache) get(key string) (re *regexp.Regexp, ok bool) {
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rc.mu.RLock()
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re, ok = rc.re[key]
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rc.mu.RUnlock()
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return
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}
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func (rc *regexpCache) set(key string, re *regexp.Regexp) {
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rc.mu.Lock()
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rc.re[key] = re
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rc.mu.Unlock()
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}
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var reCache = regexpCache{re: make(map[string]*regexp.Regexp)}
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// GetOrCompileRegexp retrieves a regexp object from the cache based upon the pattern.
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// If the pattern is not found in the cache, the pattern is compiled and added to
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// the cache.
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func GetOrCompileRegexp(pattern string) (re *regexp.Regexp, err error) {
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return reCache.getOrCompileRegexp(pattern)
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}
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// InSlice checks if a string is an element of a slice of strings
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// and returns a boolean value.
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func InSlice(arr []string, el string) bool {
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for _, v := range arr {
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if v == el {
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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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// InSlicEqualFold checks if a string is an element of a slice of strings
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// and returns a boolean value.
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// It uses strings.EqualFold to compare.
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func InSlicEqualFold(arr []string, el string) bool {
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for _, v := range arr {
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if strings.EqualFold(v, el) {
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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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// ToString converts the given value to a string.
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// Note that this is a more strict version compared to cast.ToString,
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// as it will not try to convert numeric values to strings,
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// but only accept strings or fmt.Stringer.
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func ToString(v any) (string, bool) {
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switch vv := v.(type) {
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case string:
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return vv, true
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case fmt.Stringer:
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return vv.String(), true
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}
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return "", false
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}
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type Tuple struct {
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First string
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Second string
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}
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