Last change
on this file since fa375fe was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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100644
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File size:
1.3 KB
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1 | 'use strict';
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2 |
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3 | var getFieldAsFn = require('./get-field-as-fn'),
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4 | CustomError = require('./get-error');
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5 |
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6 | /**
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7 | * Locate the root for input sources using the given codec hash
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8 | * @throws Error Where the given codec is missing an encode function
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9 | * @this {object} A loader or compilation
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10 | * @param {{encode:function}} codec A single codec with an `encode` function
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11 | * @returns {function(string):string|Error} An encode function that takes an absolute path
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12 | */
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13 | function locateRootWith(codec) {
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14 | /* jshint validthis:true */
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15 | var context = this,
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16 | root = getFieldAsFn('root')(codec);
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17 | if (!root) {
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18 | return new CustomError('Specified format does not support encoding (it lacks a "root" function)');
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19 | }
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20 | else {
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21 | return function locate() {
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22 |
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23 | // call the root
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24 | var located;
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25 | try {
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26 | located = root.call(context);
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27 | }
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28 | catch (exception) {
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29 | return getNamedError(exception);
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30 | }
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31 | return located;
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32 |
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33 | function getNamedError(details) {
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34 | var name = codec.name || '(unnamed)',
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35 | message = [
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36 | 'Locating root with codec: ' + name,
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37 | details && (details.stack ? details.stack : details)
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38 | ]
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39 | .filter(Boolean)
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40 | .join('\n');
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41 | return new Error(message);
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42 | }
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43 | };
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44 | }
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45 | }
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46 |
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47 | module.exports = locateRootWith;
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