80 lines
2.8 KiB
Go
80 lines
2.8 KiB
Go
/*
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GoToSocial
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Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package util
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import (
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"fmt"
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"strings"
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"github.com/superseriousbusiness/gotosocial/internal/regexes"
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)
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// DeriveMentionsFromText takes a plaintext (ie., not html-formatted) text,
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// and applies a regex to it to return a deduplicated list of accounts
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// mentioned in that text.
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//
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// It will look for fully-qualified account names in the form "@user@example.org".
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// or the form "@username" for local users.
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func DeriveMentionsFromText(text string) []string {
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mentionedAccounts := []string{}
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for _, m := range regexes.MentionFinder.FindAllStringSubmatch(text, -1) {
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mentionedAccounts = append(mentionedAccounts, m[1])
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}
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return UniqueStrings(mentionedAccounts)
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}
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// DeriveHashtagsFromText takes a plaintext (ie., not html-formatted) text,
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// and applies a regex to it to return a deduplicated list of hashtags
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// used in that text, without the leading #. The case of the returned
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// tags will be lowered, for consistency.
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func DeriveHashtagsFromText(text string) []string {
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tags := []string{}
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for _, m := range regexes.HashtagFinder.FindAllStringSubmatch(text, -1) {
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tags = append(tags, strings.TrimPrefix(m[1], "#"))
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}
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return UniqueStrings(tags)
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}
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// DeriveEmojisFromText takes a plaintext (ie., not html-formatted) text,
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// and applies a regex to it to return a deduplicated list of emojis
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// used in that text, without the surrounding `::`
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func DeriveEmojisFromText(text string) []string {
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emojis := []string{}
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for _, m := range regexes.EmojiFinder.FindAllStringSubmatch(text, -1) {
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emojis = append(emojis, m[1])
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}
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return UniqueStrings(emojis)
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}
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// ExtractMentionParts extracts the username test_user and the domain example.org
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// from a mention string like @test_user@example.org.
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//
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// If nothing is matched, it will return an error.
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func ExtractMentionParts(mention string) (username, domain string, err error) {
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matches := regexes.MentionName.FindStringSubmatch(mention)
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switch len(matches) {
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case 2:
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return matches[1], "", nil
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case 3:
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return matches[1], matches[2], nil
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default:
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return "", "", fmt.Errorf("couldn't match mention %s", mention)
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}
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}
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