---
name: "yapp"
section: "1p"
platform: "linux"
package: "perl-parse-yapp"
version: "1.21-10"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/yapp"
---

# yapp(1p)

A perl frontend to the Parse::Yapp module

## NAME

yapp - A perl frontend to the Parse::Yapp module

## SYNOPSYS

yapp \[options\] *grammar*\[.yp\]

yapp *-V*

yapp *-h*

## DESCRIPTION

yapp is a frontend to the Parse::Yapp module, which lets you compile Parse::Yapp grammar input files into Perl **LALR**(1) OO parser modules.

## OPTIONS

Options, as of today, are all optionals :-)

- *-v*

  Creates a file *grammar*.output describing your parser. It will show you a summary of conflicts, rules, the DFA (Deterministic Finite Automaton) states and overall usage of the parser.

- *-s*

  Create a standalone module in which the driver is included. Note that if you have more than one parser module called from a program, to have it standalone, you need this option only for one of your parser module.

- *-n*

  Disable source file line numbering embedded in your parser module. I don't know why one should need it, but it's there.

- *-m module*

  Gives your parser module the package name (or name space or module name or class name or whatever-you-call-it) of *module*.  It defaults to *grammar*

- *-o outfile*

  The compiled output file will be named *outfile* for your parser module. It defaults to *grammar*.pm or, if you specified the option *-m A::Module::Name* (see below), to *Name.pm*, in the current working directory.

- *-t filename*

  The *-t filename* option allows you to specify a file which should be  used as template for generating the parser output.  The default is to  use the internal template defined in *Parse::Yapp::Output.pm*. For how to write your own template and which substitutions are available, have a look to the module *Parse::Yapp::Output.pm* : it should be obvious.

- *-b shebang*

  If you work on systems that understand so called *shebangs*, and your generated parser is directly an executable script, you can specifie one with the *-b* option, ie:

  ```
      yapp -b '/usr/local/bin/perl -w' -o myscript.pl myscript.yp
  ```

  This will output a file called *myscript.pl* whose very first line is:

  ```
      #!/usr/local/bin/perl -w
  ```

  The argument is mandatory, but if you specify an empty string, the value of *$Config{perlpath}* will be used instead.

- *grammar*

  The input grammar file. If no suffix is given, and the file does not exists, an attempt to open the file with a suffix of  *.yp* is tried before exiting.

- *-V*

  Display current version of Parse::Yapp and gracefully exits.

- *-h*

  Display the usage screen.

## BUGS

None known now :-)

## AUTHOR

William N. Braswell, Jr. \<wbraswell\_cpan@NOSPAM.nym.hush.com\> (Remove "NOSPAM".)

## COPYRIGHT

Copyright © 1998, 1999, 2000, 2001, Francois Desarmenien. Copyright © 2017 William N. Braswell, Jr.

See [**Parse::Yapp**(3)](/Parse::Yapp/3.md) for legal use and distribution rights

## SEE ALSO

[**Parse::Yapp**(3)](/Parse::Yapp/3.md) **Perl**(1) [**yacc**(1)](/yacc/1.md) [**bison**(1)](/bison/1.md)