49 lines
1.5 KiB
Dart
49 lines
1.5 KiB
Dart
// Copyright (C) 2022 WYATT GROUP
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// Please see the AUTHORS file for details.
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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 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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// 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 General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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extension ReadingTimeX on String {
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Duration readingTime({
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int wpm = 200,
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String suffix = 'min read',
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String lessMsg = 'less than a minute',
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}) {
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bool _ansiWordBound(String c) {
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return (' ' == c) || ('\n' == c) || ('\r' == c) || ('\t' == c);
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}
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int words = 0, start = 0, end = length - 1;
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while (_ansiWordBound(this[start])) {
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start++;
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}
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while (_ansiWordBound(this[end])) {
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end--;
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}
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// Count real words
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for (int i = start; i <= end;) {
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for (; i <= end && !_ansiWordBound(this[i]); i++) {}
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words++;
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for (; i <= end && _ansiWordBound(this[i]); i++) {}
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}
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final minutes = words / wpm;
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final seconds = (minutes - minutes.floor()) * 60;
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final Duration duration = Duration(minutes: minutes.floor(), seconds: seconds.floor());
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return duration;
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}
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}
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