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Merge pull request #166 from ptomulik/delete_undef_values
Add delete_values() and delete_undef_values() functions
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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| | ||
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raise(Puppet::ParseError, | ||
"delete_undef_values(): Wrong number of arguments given " + | ||
"(#{args.size})") if args.size < 1 | ||
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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 |
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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| | ||
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raise(Puppet::ParseError, | ||
"delete_values(): Wrong number of arguments given " + | ||
"(#{arguments.size} of 2)") if arguments.size != 2 | ||
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hash = arguments[0] | ||
item = arguments[1] | ||
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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 |
29 changes: 29 additions & 0 deletions
29
spec/unit/puppet/parser/functions/delete_undef_values_spec.rb
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#! /usr/bin/env ruby -S rspec | ||
require 'spec_helper' | ||
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describe "the delete_undef_values function" do | ||
let(:scope) { PuppetlabsSpec::PuppetInternals.scope } | ||
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it "should exist" do | ||
Puppet::Parser::Functions.function("delete_undef_values").should == "function_delete_undef_values" | ||
end | ||
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it "should raise a ParseError if there is less than 1 argument" do | ||
lambda { scope.function_delete_undef_values([]) }.should( raise_error(Puppet::ParseError)) | ||
end | ||
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it "should raise a ParseError if the argument is not Array nor Hash" do | ||
lambda { scope.function_delete_undef_values(['']) }.should( raise_error(Puppet::ParseError)) | ||
lambda { scope.function_delete_undef_values([nil]) }.should( raise_error(Puppet::ParseError)) | ||
end | ||
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it "should delete all undef items from Array and only these" do | ||
result = scope.function_delete_undef_values([['a',:undef,'c','undef']]) | ||
result.should(eq(['a','c','undef'])) | ||
end | ||
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it "should delete all undef items from Hash and only these" do | ||
result = scope.function_delete_undef_values([{'a'=>'A','b'=>:undef,'c'=>'C','d'=>'undef'}]) | ||
result.should(eq({'a'=>'A','c'=>'C','d'=>'undef'})) | ||
end | ||
end |
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#! /usr/bin/env ruby -S rspec | ||
require 'spec_helper' | ||
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describe "the delete_values function" do | ||
let(:scope) { PuppetlabsSpec::PuppetInternals.scope } | ||
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it "should exist" do | ||
Puppet::Parser::Functions.function("delete_values").should == "function_delete_values" | ||
end | ||
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it "should raise a ParseError if there are fewer than 2 arguments" do | ||
lambda { scope.function_delete_values([]) }.should( raise_error(Puppet::ParseError)) | ||
end | ||
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it "should raise a ParseError if there are greater than 2 arguments" do | ||
lambda { scope.function_delete([[], 'foo', 'bar']) }.should( raise_error(Puppet::ParseError)) | ||
end | ||
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it "should raise a TypeError if the argument is not a hash" do | ||
lambda { scope.function_delete_values([1,'bar']) }.should( raise_error(TypeError)) | ||
lambda { scope.function_delete_values(['foo','bar']) }.should( raise_error(TypeError)) | ||
lambda { scope.function_delete_values([[],'bar']) }.should( raise_error(TypeError)) | ||
end | ||
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it "should delete all instances of a value from a hash" do | ||
result = scope.function_delete_values([{ 'a'=>'A', 'b'=>'B', 'B'=>'C', 'd'=>'B' },'B']) | ||
result.should(eq({ 'a'=>'A', 'B'=>'C' })) | ||
end | ||
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end |