48 lines
1.8 KiB
Ruby
48 lines
1.8 KiB
Ruby
module Puppet::Parser::Functions
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newfunction(:validate_re, :doc => <<-'ENDHEREDOC') do |args|
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Perform simple validation of a string against one or more regular
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expressions. The first argument of this function should be a string to
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test, and the second argument should be a stringified regular expression
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(without the // delimiters) or an array of regular expressions. If none
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of the regular expressions match the string passed in, compilation will
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abort with a parse error.
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If a third argument is specified, this will be the error message raised and
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seen by the user.
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The following strings will validate against the regular expressions:
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validate_re('one', '^one$')
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validate_re('one', [ '^one', '^two' ])
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The following strings will fail to validate, causing compilation to abort:
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validate_re('one', [ '^two', '^three' ])
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A helpful error message can be returned like this:
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validate_re($::puppetversion, '^2.7', 'The $puppetversion fact value does not match 2.7')
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Note: Compilation will also abort, if the first argument is not a String. Always use
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quotes to force stringification:
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validate_re("${::operatingsystemmajrelease}", '^[57]$')
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ENDHEREDOC
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if (args.length < 2) or (args.length > 3) then
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raise Puppet::ParseError, "validate_re(): wrong number of arguments (#{args.length}; must be 2 or 3)"
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end
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raise Puppet::ParseError, "validate_re(): input needs to be a String, not a #{args[0].class}" unless args[0].is_a? String
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msg = args[2] || "validate_re(): #{args[0].inspect} does not match #{args[1].inspect}"
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# We're using a flattened array here because we can't call String#any? in
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# Ruby 1.9 like we can in Ruby 1.8
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raise Puppet::ParseError, msg unless [args[1]].flatten.any? do |re_str|
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args[0] =~ Regexp.compile(re_str)
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end
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end
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end
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