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b9e0689359* Allow marks after NFC normalization Includes regression test for the Tamil example from #3618 * Disallow just numbers + marks + underscore as hashtag
72 lines
2 KiB
Go
72 lines
2 KiB
Go
// GoToSocial
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// Copyright (C) GoToSocial Authors admin@gotosocial.org
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// SPDX-License-Identifier: AGPL-3.0-or-later
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//
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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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//
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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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//
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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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package text
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import "unicode"
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func isPermittedInHashtag(r rune) bool {
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return unicode.IsLetter(r) || isPermittedIfNotEntireHashtag(r)
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}
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// isPermittedIfNotEntireHashtag is true for characters that may be in a hashtag
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// but are not allowed to be the only characters making up the hashtag.
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func isPermittedIfNotEntireHashtag(r rune) bool {
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return unicode.IsNumber(r) || unicode.IsMark(r) || r == '_'
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}
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// isHashtagBoundary returns true if rune r
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// is a recognized break character for before
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// or after a #hashtag.
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func isHashtagBoundary(r rune) bool {
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switch {
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// Zero width space.
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case r == '\u200B':
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return true
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// Zero width no-break space.
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case r == '\uFEFF':
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return true
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// Pipe character sometimes
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// used as workaround.
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case r == '|':
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return true
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// Standard Unicode white space.
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case unicode.IsSpace(r):
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return true
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// Non-underscore punctuation.
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case unicode.IsPunct(r) && r != '_':
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return true
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// Not recognized
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// hashtag boundary.
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default:
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return false
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}
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}
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// isMentionBoundary returns true if rune r
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// is a recognized break character for before
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// or after a @mention.
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func isMentionBoundary(r rune) bool {
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return unicode.IsSpace(r) ||
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unicode.IsPunct(r)
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}
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