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Implement transform module

See original GitHub issue

The transform method is a wrapper on top of “parse-traverse-generate” tool chain. Getting a regular expression string, and the nodes handler, transform should return a new (transformed) regular expression.

The issue depend on ~issue #5~.

An example of manual traversal, and code generation is shown in the Using traversal API section. A transform version of it should look like:

const regexpTree = require('regexp-tree');

const re = regexpTree.transform('/[a-z]{1,}/', {
  // Handle "Quantifier" node type,
  // transforming `{1,}` quantifier to `+`.
  onQuantifier(node) {
    // {1,} -> +
    if (
      node.type === 'Range' &&
      node.from === 1 &&
    ) {
      node.type = '+';
      delete node.from;

console.log(re); // '/[a-z]+/'

Issue Analytics

  • State:closed
  • Created 6 years ago
  • Comments:5 (5 by maintainers)

github_iconTop GitHub Comments

mathiasbynenscommented, Apr 2, 2017

My vote goes to option 4.

shvaikaleshcommented, Apr 2, 2017

What should be return value of transform?

  1. Receives string, returns string. Receives RegExp, returns RegExp.
  • It is not cool when function returns values of different types (hey, strpos).
  1. Always return string.
  • It is a bit awkward to make RegExp from string.
  1. Always return RegExp.
  • new RegExp may fail in some envs because of unsupported syntax.
  1. Return some Result object with toString and toRegExp.

EDIT: added downside of 3.

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