Last change
on this file since 6a3a178 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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File size:
1.3 KB
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[6a3a178] | 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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