pegjs

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History

David Majda 86769a6c5c Error handling: Make \|?\| return \|null\| on unsuccessful match Before this commit, the \|?\| operator returned an empty string upon unsuccessful match. This commit changes the returned value to \|null\|. It also updates the PEG.js grammar and the example grammars, which used the value returned by \|?\| quite often. Returning \|null\| is possible because it no longer indicates a match failure. I expect that this change will simplify many real-world grammars, as an empty string is almost never desirable as a return value (except some lexer-level rules) and it is often translated into \|null\| or some other value in action code. Implements part of #198.		11 years ago
..
compiler/passes	Error handling: Make \|?\| return \|null\| on unsuccessful match	11 years ago
vendor/jasmine	Upgrade jasmine and jasmine-node	11 years ago
README	Git repo npmization: Make the repo a npm package	12 years ago
generated-parser.spec.js	Error handling: Make \|?\| return \|null\| on unsuccessful match	11 years ago
helpers.js	Fix too eager proxy rules removal	11 years ago
index.html	Code generator rewrite	11 years ago
parser.spec.js	Remove the \|startRule\| property from the AST	11 years ago

README

PEG.js Spec Suite
=================

This is the PEG.js spec suite. It ensures PEG.js works correctly. All specs
should always pass on all supported platforms.

Running in a browser
--------------------

  1. Make sure you have Node.js and all the development dependencies specified
     in package.json installed.

  2. Run the following command in the PEG.js root directory (one level up from
     this one):

       make browser

  3. Start a web server and make it serve the PEG.js root directory.

  4. Point your browser to an URL corresponding to the index.html file.

  5. Watch the specs pass (or fail).

If you have Python installed, you can fulfill steps 3 and 4 by running the
following command in the PEG.js root directory

  python -m SimpleHTTPServer

and loading http://localhost:8000/spec/index.html in your browser.

Running from a command-line
---------------------------

  1. Make sure you have Node.js and all the development dependencies specified
     in package.json installed.

  2. Run the following command in the PEG.js root directory (one level up from
     this one):

       make spec

  3. Watch the specs pass (or fail).