gotosocial/internal/util/statustools.go

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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"
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"github.com/superseriousbusiness/gotosocial/internal/regexes"
)
// DeriveMentionsFromText takes a plaintext (ie., not html-formatted) text,
// and applies a regex to it to return a deduplicated list of accounts
// mentioned in that text.
//
// It will look for fully-qualified account names in the form "@user@example.org".
// or the form "@username" for local users.
func DeriveMentionsFromText(text string) []string {
mentionedAccounts := []string{}
for _, m := range regexes.MentionFinder.FindAllStringSubmatch(text, -1) {
mentionedAccounts = append(mentionedAccounts, m[1])
}
return UniqueStrings(mentionedAccounts)
}
// DeriveHashtagsFromText takes a plaintext (ie., not html-formatted) text,
// and applies a regex to it to return a deduplicated list of hashtags
// used in that text, without the leading #. The case of the returned
// tags will be lowered, for consistency.
func DeriveHashtagsFromText(text string) []string {
tags := []string{}
for _, m := range regexes.HashtagFinder.FindAllStringSubmatch(text, -1) {
tags = append(tags, strings.TrimPrefix(m[1], "#"))
}
return UniqueStrings(tags)
}
// DeriveEmojisFromText takes a plaintext (ie., not html-formatted) text,
// and applies a regex to it to return a deduplicated list of emojis
// used in that text, without the surrounding `::`
func DeriveEmojisFromText(text string) []string {
emojis := []string{}
for _, m := range regexes.EmojiFinder.FindAllStringSubmatch(text, -1) {
emojis = append(emojis, m[1])
}
return UniqueStrings(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) {
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matches := regexes.MentionName.FindStringSubmatch(mention)
switch len(matches) {
case 2:
return matches[1], "", nil
case 3:
return matches[1], matches[2], nil
default:
return "", "", fmt.Errorf("couldn't match mention %s", mention)
}
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}