46 lines
1.3 KiB
Ruby
46 lines
1.3 KiB
Ruby
#
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# is_integer.rb
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#
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module Puppet::Parser::Functions
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newfunction(:is_integer, :type => :rvalue, :doc => <<-EOS
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Returns true if the variable passed to this function is an Integer or
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a decimal (base 10) integer in String form. The string may
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start with a '-' (minus). A value of '0' is allowed, but a leading '0' digit may not
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be followed by other digits as this indicates that the value is octal (base 8).
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If given any other argument `false` is returned.
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EOS
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) do |arguments|
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if (arguments.size != 1) then
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raise(Puppet::ParseError, "is_integer(): Wrong number of arguments "+
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"given #{arguments.size} for 1")
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end
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value = arguments[0]
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# Regex is taken from the lexer of puppet
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# puppet/pops/parser/lexer.rb but modified to match also
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# negative values and disallow numbers prefixed with multiple
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# 0's
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#
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# TODO these parameter should be a constant but I'm not sure
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# if there is no risk to declare it inside of the module
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# Puppet::Parser::Functions
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# Integer numbers like
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# -1234568981273
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# 47291
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numeric = %r{^-?(?:(?:[1-9]\d*)|0)$}
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if value.is_a? Integer or (value.is_a? String and value.match numeric)
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return true
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else
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return false
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end
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end
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end
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# vim: set ts=2 sw=2 et :
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