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module Puppet::Parser::Functions
newfunction(:validate_re, :doc => <<-'ENDHEREDOC') do |args|
Perform simple validation of a string against one or more regular
expressions. The first argument of this function should be a string to
test, and the second argument should be a stringified regular expression
(without the // delimiters) or an array of regular expressions. If none
of the regular expressions match the string passed in, compilation will
abort with a parse error.
If a third argument is specified, this will be the error message raised and
seen by the user.
The following strings will validate against the regular expressions:
validate_re('one', '^one$')
validate_re('one', [ '^one', '^two' ])
The following strings will fail to validate, causing compilation to abort:
validate_re('one', [ '^two', '^three' ])
A helpful error message can be returned like this:
validate_re($::puppetversion, '^2.7', 'The $puppetversion fact value does not match 2.7')
ENDHEREDOC
if (args.length < 2) or (args.length > 3) then
raise Puppet::ParseError, ("validate_re(): wrong number of arguments (#{args.length}; must be 2 or 3)")
end
msg = args[2] || "validate_re(): #{args[0].inspect} does not match #{args[1].inspect}"
# We're using a flattened array here because we can't call String#any? in
# Ruby 1.9 like we can in Ruby 1.8
raise Puppet::ParseError, (msg) unless [args[1]].flatten.any? do |re_str|
args[0] =~ Regexp.compile(re_str)
end
end
end
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