forked from TrueCloudLab/restic
96 lines
3 KiB
Go
96 lines
3 KiB
Go
// Package english provides utilities to generate more user-friendly English output.
|
|
package english
|
|
|
|
import (
|
|
"fmt"
|
|
"strings"
|
|
)
|
|
|
|
// These are included because they are common technical terms.
|
|
var specialPlurals = map[string]string{
|
|
"index": "indices",
|
|
"matrix": "matrices",
|
|
"vertex": "vertices",
|
|
}
|
|
|
|
var sibilantEndings = []string{"s", "sh", "tch", "x"}
|
|
|
|
var isVowel = map[byte]bool{
|
|
'A': true, 'E': true, 'I': true, 'O': true, 'U': true,
|
|
'a': true, 'e': true, 'i': true, 'o': true, 'u': true,
|
|
}
|
|
|
|
// PluralWord builds the plural form of an English word.
|
|
// The simple English rules of regular pluralization will be used
|
|
// if the plural form is an empty string (i.e. not explicitly given).
|
|
// The special cases are not guaranteed to work for strings outside ASCII.
|
|
func PluralWord(quantity int, singular, plural string) string {
|
|
if quantity == 1 {
|
|
return singular
|
|
}
|
|
if plural != "" {
|
|
return plural
|
|
}
|
|
if plural = specialPlurals[singular]; plural != "" {
|
|
return plural
|
|
}
|
|
|
|
// We need to guess what the English plural might be. Keep this
|
|
// function simple! It doesn't need to know about every possiblity;
|
|
// only regular rules and the most common special cases.
|
|
//
|
|
// Reference: http://en.wikipedia.org/wiki/English_plural
|
|
|
|
for _, ending := range sibilantEndings {
|
|
if strings.HasSuffix(singular, ending) {
|
|
return singular + "es"
|
|
}
|
|
}
|
|
l := len(singular)
|
|
if l >= 2 && singular[l-1] == 'o' && !isVowel[singular[l-2]] {
|
|
return singular + "es"
|
|
}
|
|
if l >= 2 && singular[l-1] == 'y' && !isVowel[singular[l-2]] {
|
|
return singular[:l-1] + "ies"
|
|
}
|
|
|
|
return singular + "s"
|
|
}
|
|
|
|
// Plural formats an integer and a string into a single pluralized string.
|
|
// The simple English rules of regular pluralization will be used
|
|
// if the plural form is an empty string (i.e. not explicitly given).
|
|
func Plural(quantity int, singular, plural string) string {
|
|
return fmt.Sprintf("%d %s", quantity, PluralWord(quantity, singular, plural))
|
|
}
|
|
|
|
// WordSeries converts a list of words into a word series in English.
|
|
// It returns a string containing all the given words separated by commas,
|
|
// the coordinating conjunction, and a serial comma, as appropriate.
|
|
func WordSeries(words []string, conjunction string) string {
|
|
switch len(words) {
|
|
case 0:
|
|
return ""
|
|
case 1:
|
|
return words[0]
|
|
default:
|
|
return fmt.Sprintf("%s %s %s", strings.Join(words[:len(words)-1], ", "), conjunction, words[len(words)-1])
|
|
}
|
|
}
|
|
|
|
// OxfordWordSeries converts a list of words into a word series in English,
|
|
// using an Oxford comma (https://en.wikipedia.org/wiki/Serial_comma). It
|
|
// returns a string containing all the given words separated by commas, the
|
|
// coordinating conjunction, and a serial comma, as appropriate.
|
|
func OxfordWordSeries(words []string, conjunction string) string {
|
|
switch len(words) {
|
|
case 0:
|
|
return ""
|
|
case 1:
|
|
return words[0]
|
|
case 2:
|
|
return strings.Join(words, fmt.Sprintf(" %s ", conjunction))
|
|
default:
|
|
return fmt.Sprintf("%s, %s %s", strings.Join(words[:len(words)-1], ", "), conjunction, words[len(words)-1])
|
|
}
|
|
}
|