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'use strict';
var getFieldAsFn = require('./get-field-as-fn'),
CustomError = require('./get-error');
/**
* Create an encoder for output 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|false} An encode function that takes an absolute path
*/
function encodeSourcesWith(codec) {
/* jshint validthis:true */
var context = this,
encoder = getFieldAsFn('encode')(codec);
if (!encoder) {
return new CustomError('Specified format does not support encoding (it lacks an "encoder" function)');
}
else {
return function encode(absoluteSource) {
// call the encoder
var encoded;
try {
encoded = absoluteSource && encoder.call(context, absoluteSource);
}
catch (exception) {
return getNamedError(exception);
}
return encoded;
function getNamedError(details) {
var name = codec.name || '(unnamed)',
message = [
'Encoding with codec: ' + name,
'Absolute source: ' + absoluteSource,
details && (details.stack ? details.stack : details)
]
.filter(Boolean)
.join('\n');
return new Error(message);
}
};
}
}
module.exports = encodeSourcesWith;
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