46 lines
1.3 KiB
Go
46 lines
1.3 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 (
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"github.com/rivo/uniseg"
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)
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// FirstNBytesByWords produces a prefix substring of up to n bytes from a given string, respecting Unicode grapheme and
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// word boundaries. The substring may be empty, and may include leading or trailing whitespace.
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func FirstNBytesByWords(s string, n int) string {
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substringEnd := 0
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graphemes := uniseg.NewGraphemes(s)
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for graphemes.Next() {
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if !graphemes.IsWordBoundary() {
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continue
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}
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_, end := graphemes.Positions()
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if end > n {
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break
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}
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substringEnd = end
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}
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return s[0:substringEnd]
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}
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