#
# delete.rb
#
+module Puppet::Parser::Functions
+ newfunction(:delete, :type => :rvalue, :doc => <<-DOC
+ @summary
+ Deletes all instances of a given element from an array, substring from a
+ string, or key from a hash.
-# TODO(Krzysztof Wilczynski): We need to add support for regular expression ...
+ @example Example usage
-module Puppet::Parser::Functions
- newfunction(:delete, :type => :rvalue, :doc => <<-EOS
-Deletes all instances of a given element from an array, substring from a
-string, or key from a hash.
+ delete(['a','b','c','b'], 'b')
+ Would return: ['a','c']
-*Examples:*
+ delete({'a'=>1,'b'=>2,'c'=>3}, 'b')
+ Would return: {'a'=>1,'c'=>3}
- delete(['a','b','c','b'], 'b')
- Would return: ['a','c']
+ delete({'a'=>1,'b'=>2,'c'=>3}, ['b','c'])
+ Would return: {'a'=>1}
- delete({'a'=>1,'b'=>2,'c'=>3}, 'b')
- Would return: {'a'=>1,'c'=>3}
+ delete('abracadabra', 'bra')
+ Would return: 'acada'
- delete({'a'=>1,'b'=>2,'c'=>3}, ['b','c'])
- Would return: {'a'=>1}
+ ['a', 'b', 'c', 'b'] - 'b'
+ Would return: ['a', 'c']
- delete('abracadabra', 'bra')
- Would return: 'acada'
- EOS
- ) do |arguments|
+ {'a'=>1,'b'=>2,'c'=>3} - ['b','c'])
+ Would return: {'a' => '1'}
- if (arguments.size != 2) then
- raise(Puppet::ParseError, "delete(): Wrong number of arguments "+
- "given #{arguments.size} for 2.")
- end
+ 'abracadabra'.regsubst(/bra/, '', 'G')
+ Would return: 'acada'
+
+ > *Note:*
+ From Puppet 4.0.0 the minus (-) operator deletes values from arrays and keys from a hash
+ `{'a'=>1,'b'=>2,'c'=>3} - ['b','c'])`
+ >
+ A global delete from a string can be performed with the
+ [`regsubst`](https://puppet.com/docs/puppet/latest/function.html#regsubst) function:
+ `'abracadabra'.regsubst(/bra/, '', 'G')`
+
+ In general, the built-in [`filter`](https://puppet.com/docs/puppet/latest/function.html#filter)
+ function can filter out entries from arrays and hashes based on keys and/or values.
+
+ @return [String] The filtered String, if one was given.
+ @return [Hash] The filtered Hash, if one was given.
+ @return [Array] The filtered Array, if one was given.
+ DOC
+ ) do |arguments|
+
+ raise(Puppet::ParseError, "delete(): Wrong number of arguments given #{arguments.size} for 2") unless arguments.size == 2
collection = arguments[0].dup
Array(arguments[1]).each do |item|
case collection
- when Array, Hash
- collection.delete item
- when String
- collection.gsub! item, ''
- else
- raise(TypeError, "delete(): First argument must be an Array, " +
- "String, or Hash. Given an argument of class #{collection.class}.")
+ when Array, Hash
+ collection.delete item
+ when String
+ collection.gsub! item, ''
+ else
+ raise(TypeError, "delete(): First argument must be an Array, String, or Hash. Given an argument of class #{collection.class}.")
end
end
collection