48 lines
1.3 KiB
JavaScript
48 lines
1.3 KiB
JavaScript
'use strict';
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var getFieldAsFn = require('./get-field-as-fn'),
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CustomError = require('./get-error');
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/**
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* Locate the root for input sources using the given codec hash
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* @throws Error Where the given codec is missing an encode function
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* @this {object} A loader or compilation
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* @param {{encode:function}} codec A single codec with an `encode` function
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* @returns {function(string):string|Error} An encode function that takes an absolute path
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*/
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function locateRootWith(codec) {
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/* jshint validthis:true */
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var context = this,
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root = getFieldAsFn('root')(codec);
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if (!root) {
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return new CustomError('Specified format does not support encoding (it lacks a "root" function)');
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}
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else {
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return function locate() {
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// call the root
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var located;
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try {
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located = root.call(context);
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}
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catch (exception) {
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return getNamedError(exception);
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}
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return located;
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function getNamedError(details) {
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var name = codec.name || '(unnamed)',
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message = [
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'Locating root with codec: ' + name,
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details && (details.stack ? details.stack : details)
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]
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.filter(Boolean)
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.join('\n');
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return new Error(message);
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}
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};
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}
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}
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module.exports = locateRootWith;
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