Config::Grammar is a Perl module to parse configuration files by following a grammar, which specifies how the configuration file should look like. The configuration files are nice to work with for humans and the error messages are helpful because it tells right away that for example you are setting a variable which isn't defined. Config::Grammar supports many advanced features, that you can read about in its documentation.
WWW: http://search.cpan.org/dist/Config-Grammar/
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