76 lines
1.9 KiB
Ruby
76 lines
1.9 KiB
Ruby
#
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# is_numeric.rb
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#
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module Puppet::Parser::Functions
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newfunction(:is_numeric, :type => :rvalue, :doc => <<-EOS
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Returns true if the given argument is a Numeric (Integer or Float),
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or a String containing either a valid integer in decimal base 10 form, or
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a valid floating point string representation.
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The function recognizes only decimal (base 10) integers and float but not
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integers in hex (base 16) or octal (base 8) form.
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The string representation may start with a '-' (minus). If a decimal '.' is used,
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it must be followed by at least one digit.
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Valid examples:
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77435
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10e-12
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-8475
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0.2343
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-23.561e3
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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_numeric(): 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 invalid octal numbers or
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# numbers prefixed with multiple 0's (except in hex numbers)
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#
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# TODO these parameters should be constants but I'm not sure
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# if there is no risk to declare them inside of the module
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# Puppet::Parser::Functions
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# TODO decide if this should be used
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# HEX numbers like
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# 0xaa230F
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# 0X1234009C
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# 0x0012
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# -12FcD
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#numeric_hex = %r{^-?0[xX][0-9A-Fa-f]+$}
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# TODO decide if this should be used
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# OCTAL numbers like
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# 01234567
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# -045372
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#numeric_oct = %r{^-?0[1-7][0-7]*$}
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# Integer/Float numbers like
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# -0.1234568981273
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# 47291
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# 42.12345e-12
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numeric = %r{^-?(?:(?:[1-9]\d*)|0)(?:\.\d+)?(?:[eE]-?\d+)?$}
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if value.is_a? Numeric or (value.is_a? String and (
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value.match(numeric) #or
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# value.match(numeric_hex) or
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# value.match(numeric_oct)
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))
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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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