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/*
GoToSocial
Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package util
import (
"fmt"
"strings"
)
// DeriveMentionsFromStatus takes a plaintext (ie., not html-formatted) status,
// and applies a regex to it to return a deduplicated list of accounts
// mentioned in that status.
//
// It will look for fully-qualified account names in the form "@user@example.org".
// or the form "@username" for local users.
func DeriveMentionsFromStatus(status string) []string {
mentionedAccounts := []string{}
for _, m := range mentionFinderRegex.FindAllStringSubmatch(status, -1) {
mentionedAccounts = append(mentionedAccounts, m[1])
}
return unique(mentionedAccounts)
}
// DeriveHashtagsFromStatus takes a plaintext (ie., not html-formatted) status,
// and applies a regex to it to return a deduplicated list of hashtags
// used in that status, without the leading #. The case of the returned
// tags will be lowered, for consistency.
func DeriveHashtagsFromStatus(status string) []string {
tags := []string{}
for _, m := range HashtagFinderRegex.FindAllStringSubmatch(status, -1) {
tags = append(tags, strings.TrimPrefix(m[1], "#"))
}
return uniqueLower(tags)
}
// DeriveEmojisFromStatus takes a plaintext (ie., not html-formatted) status,
// and applies a regex to it to return a deduplicated list of emojis
// used in that status, without the surround ::.
func DeriveEmojisFromStatus(status string) []string {
emojis := []string{}
for _, m := range emojiFinderRegex.FindAllStringSubmatch(status, -1) {
emojis = append(emojis, m[1])
}
return unique(emojis)
}
// ExtractMentionParts extracts the username test_user and the domain example.org
// from a mention string like @test_user@example.org.
//
// If nothing is matched, it will return an error.
func ExtractMentionParts(mention string) (username, domain string, err error) {
matches := mentionNameRegex.FindStringSubmatch(mention)
if matches == nil || len(matches) != 3 {
err = fmt.Errorf("could't match mention %s", mention)
return
}
username = matches[1]
domain = matches[2]
return
}
// IsMention returns true if the passed string looks like @whatever@example.org
func IsMention(mention string) bool {
return mentionNameRegex.MatchString(strings.ToLower(mention))
}
// unique returns a deduplicated version of a given string slice.
func unique(s []string) []string {
keys := make(map[string]bool)
list := []string{}
for _, entry := range s {
if _, value := keys[entry]; !value {
keys[entry] = true
list = append(list, entry)
}
}
return list
}
// uniqueLower returns a deduplicated version of a given string slice, with all entries converted to lowercase
func uniqueLower(s []string) []string {
keys := make(map[string]bool)
list := []string{}
for _, entry := range s {
eLower := strings.ToLower(entry)
if _, value := keys[eLower]; !value {
keys[eLower] = true
list = append(list, eLower)
}
}
return list
}
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