pegjs

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History

David Majda 57e806383c Error handling: Use a special value (not \|null\|) to indicate failure Using a special value to indicate match failure instead of \|null\| allows actions to return \|null\| as a regular value. This simplifies e.g. the JSON parser. Note the special value is internal and intentionally undocumented. This means that there is currently no official way how to trigger a match failure from an action. This is a temporary state which will be fixed soon. The negative performance impact (see below) is probably caused by changing lot of comparisons against \|null\| (which likely check the value against a fixed constant representing \|null\| in the interpreter) to comparisons against the special value (which likely check the value against another value in the interpreter). Implements part of #198. Speed impact ------------ Before: 1146.82 kB/s After: 1031.25 kB/s Difference: -10.08% Size impact ----------- Before: 950817 b After: 973269 b Difference: 2.36% (Measured by /tools/impact with Node.js v0.6.18 on x86_64 GNU/Linux.)		11 years ago
..
compiler/passes	Error handling: Use a special value (not \|null\|) to indicate failure	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: Use a special value (not \|null\|) to indicate failure	11 years ago
helpers.js	Fix too eager proxy rules removal	12 years ago
index.html	Code generator rewrite	12 years ago
parser.spec.js	Remove the \|startRule\| property from the AST	12 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).