Merge pull request #166 from ptomulik/delete_undef_values

Add delete_values() and delete_undef_values() functions

2 files changed, 61 insertions, 0 deletions

diff --git a/lib/puppet/parser/functions/delete_undef_values.rb b/lib/puppet/parser/functions/delete_undef_values.rb
new file mode 100644
index 0000000..4eecab2
--- /dev/null
+++ b/lib/puppet/parser/functions/delete_undef_values.rb
@@ -0,0 +1,34 @@
+module Puppet::Parser::Functions
+  newfunction(:delete_undef_values, :type => :rvalue, :doc => <<-EOS
+Returns a copy of input hash or array with all undefs deleted.
+
+*Examples:*
+    
+    $hash = delete_undef_values({a=>'A', b=>'', c=>undef, d => false})
+
+Would return: {a => 'A', b => '', d => false}
+
+    $array = delete_undef_values(['A','',undef,false])
+
+Would return: ['A','',false]
+    
+      EOS
+    ) do |args|
+
+    raise(Puppet::ParseError,
+          "delete_undef_values(): Wrong number of arguments given " +
+          "(#{args.size})") if args.size < 1
+
+    result = args[0]
+    if result.is_a?(Hash)
+      result.delete_if {|key, val| val.equal? :undef}
+    elsif result.is_a?(Array)
+      result.delete :undef
+    else
+      raise(Puppet::ParseError, 
+            "delete_undef_values(): Wrong argument type #{args[0].class} " +
+            "for first argument")
+    end
+    result
+  end
+end
diff --git a/lib/puppet/parser/functions/delete_values.rb b/lib/puppet/parser/functions/delete_values.rb
new file mode 100644
index 0000000..2fcbd16
--- /dev/null
+++ b/lib/puppet/parser/functions/delete_values.rb
@@ -0,0 +1,27 @@
+module Puppet::Parser::Functions
+  newfunction(:delete_values, :type => :rvalue, :doc => <<-EOS
+Deletes all instances of a given value from a hash.
+
+*Examples:*
+
+    delete_values({'a'=>'A','b'=>'B','c'=>'C','B'=>'D'}, 'B')
+
+Would return: {'a'=>'A','c'=>'C','B'=>'D'}
+
+      EOS
+    ) do |arguments|
+
+    raise(Puppet::ParseError,
+          "delete_values(): Wrong number of arguments given " +
+          "(#{arguments.size} of 2)") if arguments.size != 2
+
+    hash = arguments[0]
+    item = arguments[1]
+
+    if not hash.is_a?(Hash)
+      raise(TypeError, "delete_values(): First argument must be a Hash. " + \
+                       "Given an" " argument of class #{hash.class}.") 
+    end
+    hash.delete_if { |key, val| item == val }
+  end
+end