34 lines
No EOL
599 B
JavaScript
34 lines
No EOL
599 B
JavaScript
/**
|
|
* The MIT License (MIT)
|
|
* Copyright (c) 2017-present Dmitry Soshnikov <dmitry.soshnikov@gmail.com>
|
|
*/
|
|
|
|
'use strict';
|
|
|
|
/**
|
|
* A regexp-tree plugin to remove non-capturing empty groups.
|
|
*
|
|
* /(?:)a/ -> /a/
|
|
* /a|(?:)/ -> /a|/
|
|
*/
|
|
|
|
module.exports = {
|
|
Group: function Group(path) {
|
|
var node = path.node,
|
|
parent = path.parent;
|
|
|
|
var childPath = path.getChild();
|
|
|
|
if (node.capturing || childPath) {
|
|
return;
|
|
}
|
|
|
|
if (parent.type === 'Repetition') {
|
|
|
|
path.getParent().replace(node);
|
|
} else if (parent.type !== 'RegExp') {
|
|
|
|
path.remove();
|
|
}
|
|
}
|
|
}; |