diff options
Diffstat (limited to 'lib/puppet/parser/functions/is_numeric.rb')
-rw-r--r-- | lib/puppet/parser/functions/is_numeric.rb | 54 |
1 files changed, 51 insertions, 3 deletions
diff --git a/lib/puppet/parser/functions/is_numeric.rb b/lib/puppet/parser/functions/is_numeric.rb index abf0321..e7e1d2a 100644 --- a/lib/puppet/parser/functions/is_numeric.rb +++ b/lib/puppet/parser/functions/is_numeric.rb @@ -4,7 +4,23 @@ module Puppet::Parser::Functions newfunction(:is_numeric, :type => :rvalue, :doc => <<-EOS -Returns true if the variable passed to this function is a number. +Returns true if the given argument is a Numeric (Integer or Float), +or a String containing either a valid integer in decimal base 10 form, or +a valid floating point string representation. + +The function recognizes only decimal (base 10) integers and float but not +integers in hex (base 16) or octal (base 8) form. + +The string representation may start with a '-' (minus). If a decimal '.' is used, +it must be followed by at least one digit. + +Valid examples: + + 77435 + 10e-12 + -8475 + 0.2343 + -23.561e3 EOS ) do |arguments| @@ -15,12 +31,44 @@ Returns true if the variable passed to this function is a number. value = arguments[0] - if value == value.to_f.to_s or value == value.to_i.to_s or value.is_a? Numeric then + # Regex is taken from the lexer of puppet + # puppet/pops/parser/lexer.rb but modified to match also + # negative values and disallow invalid octal numbers or + # numbers prefixed with multiple 0's (except in hex numbers) + # + # TODO these parameters should be constants but I'm not sure + # if there is no risk to declare them inside of the module + # Puppet::Parser::Functions + + # TODO decide if this should be used + # HEX numbers like + # 0xaa230F + # 0X1234009C + # 0x0012 + # -12FcD + #numeric_hex = %r{^-?0[xX][0-9A-Fa-f]+$} + + # TODO decide if this should be used + # OCTAL numbers like + # 01234567 + # -045372 + #numeric_oct = %r{^-?0[1-7][0-7]*$} + + # Integer/Float numbers like + # -0.1234568981273 + # 47291 + # 42.12345e-12 + numeric = %r{^-?(?:(?:[1-9]\d*)|0)(?:\.\d+)?(?:[eE]-?\d+)?$} + + if value.is_a? Numeric or (value.is_a? String and ( + value.match(numeric) #or + # value.match(numeric_hex) or + # value.match(numeric_oct) + )) return true else return false end - end end |