Javascript parser for Java [closed]

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From https://github.com/google/caja/blob/master/src/com/google/caja/parser/js/Parser.java

The grammar below is a context-free representation of the grammar this
parser parses. It disagrees with EcmaScript 262 Edition 3 (ES3) where
implementations disagree with ES3. The rules for semicolon insertion and
the possible backtracking in expressions needed to properly handle
backtracking are commented thoroughly in code, since semicolon insertion
requires information from both the lexer and parser and is not determinable
with finite lookahead.

Noteworthy features

  1. Reports warnings on a queue where an error doesn’t prevent any further errors, so that we can report multiple errors in a single compile pass instead of forcing developers to play whack-a-mole.
  2. Does not parse Firefox style catch (<Identifier> if <Expression>) since those don’t work on IE and many other interpreters.
  3. Recognizes const since many interpreters do (not IE) but warns.
  4. Allows, but warns, on trailing commas in Array and Object constructors.
  5. Allows keywords as identifier names but warns since different interpreters have different keyword sets. This allows us to use an expansive keyword set.

To parse strict code, pass in a PedanticWarningMessageQueue that
converts MessageLevel#WARNING and above to MessageLevel#FATAL_ERROR.

CajaTestCase.js shows how to set up a parser, and [fromResource] and [fromString] in the same class show how to get an input of the right kind.

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