The Lemon program is an LALR(1) parser generator. It takes a context free
grammar and converts it into a subroutine that will parse a file using that
grammar.

Lemon is similar to the much more famous programs "YACC" and "BISON". But
lemon is not compatible with either yacc or bison. There are several
important differences:

 * Lemon using a different grammar syntax which is less prone to programming
   errors.
 * The parser generated by Lemon is both re-entrant and thread-safe.
 * Lemon includes the concept of a non-terminal destructor, which makes it much
   easier to write a parser that does not leak memory.

The complete source code to the lemon parser generator is contained in two
files.
The file lemon.c is the parser generator program itself. A separate file
lempar.c
is the template for the parser subroutine that lemon generates. Documentation on
lemon is also available.

Both the source code to lemon itself and the code that lemon generates are in
the public domain.

http://www.hwaci.com/sw/lemon/

 PERMSSN    UID  GID    PACKED    SIZE  RATIO METHOD CRC     STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                 4524    4648  97.3% -lh5- 100c Dec 17 02:00 lemon.info
[generic]                33376   81784  40.8% -lh5- 4699 Dec 17 01:52 lemon/lemon
[generic]                  647    1229  52.6% -lh5- 09a7 Dec 17 01:57 lemon/lemon-morphos.readme
[generic]                 5801    5900  98.3% -lh5- 32c6 Dec 17 02:00 lemon/lemon-morphos.readme.info
[generic]                37309  142638  26.2% -lh5- 4708 Dec 17 01:48 lemon/lemon.c
[generic]                11252   33449  33.6% -lh5- eec3 Dec 17 01:48 lemon/lemon.html
[generic]                 5801    5900  98.3% -lh5- 32c6 Dec 17 02:01 lemon/lemon.html.info
[generic]                 7847   26655  29.4% -lh5- 3c7b Dec 17 01:48 lemon/lempar.c
[generic]                  382     715  53.4% -lh5- 7725 Dec 17 01:51 lemon/makefile
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         9 files  106939  302918  35.3%            Dec 16 21:16