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Versions: 10
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Contents
/**
* The MIT License (MIT)
* Copyright (c) 2017-present Dmitry Soshnikov <dmitry.soshnikov@gmail.com>
*/
'use strict';
/**
* A regexp-tree plugin to replace different range-based quantifiers
* with their symbol equivalents.
*
* a{0,} -> a*
* a{1,} -> a+
* a{1} -> a
*
* NOTE: the following is automatically handled in the generator:
*
* a{3,3} -> a{3}
*/
module.exports = {
Quantifier: function Quantifier(path) {
var node = path.node;
if (node.kind !== 'Range') {
return;
}
// a{0,} -> a*
rewriteOpenZero(path);
// a{1,} -> a+
rewriteOpenOne(path);
// a{1} -> a
rewriteExactOne(path);
}
};
function rewriteOpenZero(path) {
var node = path.node;
if (node.from !== 0 || node.to) {
return;
}
node.kind = '*';
delete node.from;
}
function rewriteOpenOne(path) {
var node = path.node;
if (node.from !== 1 || node.to) {
return;
}
node.kind = '+';
delete node.from;
}
function rewriteExactOne(path) {
var node = path.node;
if (node.from !== 1 || node.to !== 1) {
return;
}
path.parentPath.replace(path.parentPath.node.expression);
}
Version data entries
10 entries across 10 versions & 3 rubygems