Last Change: 2018-09-07, 16:50
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yapp − A perl frontend to the Parse::Yapp module
yapp [options] grammar[.yp]
yapp −V
yapp −h
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, as of today, are all optionals :−)
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−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. |
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−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. |
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−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.
−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.
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−V |
Display current version of Parse::Yapp and gracefully exits. |
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−h |
Display the usage screen. |
None known now :−)
Francois Desarmenien <francois AT fdesar DOT net>
(c) Copyright 1998−1999 Francois Desarmenien, all rights reserved. See Parse::Yapp(3) for legal use and distribution rights