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on this file was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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1 | /*
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2 | * MIT License http://opensource.org/licenses/MIT
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3 | * Author: Ben Holloway @bholloway
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4 | */
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5 | 'use strict';
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6 |
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7 | var stream = require('stream');
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8 |
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9 | var hasLogged = false;
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10 |
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11 | function logToTestHarness(maybeStream, options) {
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12 | var doLogging =
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13 | !hasLogged &&
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14 | !!maybeStream &&
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15 | (typeof maybeStream === 'object') &&
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16 | (maybeStream instanceof stream.Writable);
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17 |
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18 | if (doLogging) {
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19 | hasLogged = true; // ensure we log only once
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20 | Object.keys(options).forEach(eachOptionKey);
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21 | }
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22 |
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23 | function eachOptionKey(key) {
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24 | maybeStream.write(key + ': ' + stringify(options[key]) + '\n');
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25 | }
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26 |
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27 | function stringify(value) {
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28 | try {
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29 | return JSON.stringify(value) || String(value);
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30 | } catch (e) {
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31 | return '-unstringifyable-';
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32 | }
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33 | }
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34 | }
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35 |
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36 | module.exports = logToTestHarness;
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