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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
begin
max_length = Integer(max_length)
raise ArgumentError if max_length <= 0
rescue ArgumentError, TypeError
raise Puppet::ParseError, "validate_slength(): Expected second argument to be a positive Numeric, got #{max_length}:#{max_length.class}"
end
if min_length
begin
min_length = Integer(min_length)
raise ArgumentError if min_length < 0
rescue ArgumentError, TypeError
raise Puppet::ParseError, "validate_slength(): Expected third argument to be unset or a positive Numeric, got #{min_length}:#{min_length.class}"
end
else
min_length = 0
end
if min_length > max_length
raise Puppet::ParseError, "validate_slength(): Expected second argument to be larger than third argument"
end
validator = lambda do |str|
unless str.length <= max_length and str.length >= min_length
raise Puppet::ParseError, "validate_slength(): Expected length of #{input.inspect} to be between #{min_length} and #{max_length}, was #{input.length}"
end
end
case input
when String
validator.call(input)
when Array
input.each_with_index do |arg, pos|
if arg.is_a? String
validator.call(arg)
else
raise Puppet::ParseError, "validate_slength(): Expected element at array position #{pos} to be a String, got #{arg.class}"
end
end
else
raise Puppet::ParseError, "validate_slength(): Expected first argument to be a String or Array, got #{input.class}"
end
end
end
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