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module Puppet::Parser::Functions
newfunction(:validate_slength, :doc => <<-'ENDHEREDOC') do |args|
Validate that the first argument is a string (or an array of strings), and
less/equal to than the length of the second argument. An optional third
parameter can be given a the minimum length. It fails if the first
argument is not a string or array of strings, and if arg 2 and arg 3 are
not convertable to a number.
The following values will pass:
validate_slength("discombobulate",17)
validate_slength(["discombobulate","moo"],17)
validate_slength(["discombobulate","moo"],17,3)
The following valueis will not:
validate_slength("discombobulate",1)
validate_slength(["discombobulate","thermometer"],5)
validate_slength(["discombobulate","moo"],17,10)
ENDHEREDOC
raise Puppet::ParseError, "validate_slength(): Wrong number of arguments (#{args.length}; must be 2 or 3)" unless args.length == 2 or args.length == 3
input, max_length, min_length = *args
unless (input.is_a?(String) or input.is_a?(Array))
raise Puppet::ParseError, "validate_slength(): Expected first argument to be a String or Array, got a #{input.class}"
end
begin
max_length = max_length.to_i
rescue NoMethodError => e
raise Puppet::ParseError, "validate_slength(): Expected second argument to be a positive Numeric, got a #{max_length.class}"
end
unless args.length == 2
begin
min_length = Integer(min_length)
rescue StandardError => e
raise Puppet::ParseError, "validate_slength(): Expected third argument to be unset or a positive Numeric, got a #{min_length.class}"
end
else
min_length = 0
end
raise Puppet::ParseError, "validate_slength(): please pass a positive number as max_length" unless max_length > 0
raise Puppet::ParseError, "validate_slength(): please pass a positive number as min_length" unless min_length >= 0
raise Puppet::ParseError, "validate_slength(): please pass a min length that is smaller than the maximum" unless min_length <= max_length
case input
when String
raise Puppet::ParseError, "validate_slength(): #{input.inspect} is #{input.length} characters. It should have been between #{min_length} and #{max_length} characters" unless input.length <= max_length and min_length <= input.length
when Array
input.each do |arg|
if arg.is_a?(String)
unless ( arg.is_a?(String) and arg.length <= max_length and min_length <= arg.length)
raise Puppet::ParseError, "validate_slength(): #{arg.inspect} is #{arg.length} characters. It should have been between #{min_length} and #{max_length} characters"
end
else
raise Puppet::ParseError, "validate_slength(): #{arg.inspect} is not a string, it's a #{arg.class}"
end
end
else
raise Puppet::ParseError, "validate_slength(): please pass a string, or an array of strings - what you passed didn't work for me at all - #{input.class}"
end
end
end
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