This library is intended to help check the ECMAScript specification conformity of regular expression evaluations.
There are a bunch of potential applications:
- Regression testing the specification against host implementations.
- Use in understanding why regular expressions succeed/fail to match.
- Use in a metacircular interpreter.
- Use as a staging ground for regular expression optimizations and/or a regular expression compiler. (Such a compiler could target eval as a backend or a JIT code execution foreign function.)
- Be capable of visualizing (or at least dumping out) the ECMAScript standard steps taken in matching a regular expression.
- Be capable of enabling/disabling the de-facto quirks from various browsers which are not yet part of the standard.
- Be capable of running a thorough regression suite against the host regular expression engine (presumably with a set of permitted quirk options).
- Keep the JS code a direct translation from the spec where possible and practical.
Simple usage is as follows:
$ JS_SHELL=d8 make
- make test
- Runs the entire test suite. Right now this is parser and evaluation (matcher) tests.
- make hosted
Creates a directory structure that can be used for in-browser testing. If you subsequently run:
$ make hosted ... $ cd hosted/ $ python -m SimpleHTTPServer Serving HTTP on 0.0.0.0 port 8000 ...
You can navigate to the local testing site in your browser.
- The regular expression library
- The regular expression library test suites
- For automatically generating unicode bitmaps from the specification
- Latest version of the generated unicode bitmaps
- The page that gets installed via the make hosted target