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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 (
"strings"
)
// DeriveMentions 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.
// The case of the returned mentions will be lowered, for consistency.
func DeriveMentions(status string) []string {
mentionedAccounts := []string{}
for _, m := range mentionRegex.FindAllStringSubmatch(status, -1) {
mentionedAccounts = append(mentionedAccounts, m[1])
}
return Lower(Unique(mentionedAccounts))
}
// DeriveHashtags 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 DeriveHashtags(status string) []string {
tags := []string{}
for _, m := range hashtagRegex.FindAllStringSubmatch(status, -1) {
tags = append(tags, m[1])
}
return Lower(Unique(tags))
}
// DeriveEmojis 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 ::. The case of the returned
// emojis will be lowered, for consistency.
func DeriveEmojis(status string) []string {
emojis := []string{}
for _, m := range emojiRegex.FindAllStringSubmatch(status, -1) {
emojis = append(emojis, m[1])
}
return Lower(Unique(emojis))
}
// 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
}
// Lower lowercases all strings in a given string slice
func Lower(s []string) []string {
new := []string{}
for _, i := range s {
new = append(new, strings.ToLower(i))
}
return new
}
// HTMLFormat takes a plaintext formatted status string, and converts it into
// a nice HTML-formatted string.
//
// This includes:
// - Replacing line-breaks with <p>
// - Replacing URLs with hrefs.
// - Replacing mentions with links to that account's URL as stored in the database.
func HTMLFormat(status string) string {
// TODO: write proper HTML formatting logic for a status
return status
}
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