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