Revert "Merge pull request #130 from jhoblitt/has_element"

This reverts commit f7a18189ec, reversing
changes made to 36a7b29630.

I'm reverting this change because of concerns raised by Peter Meier that
it duplicates the "in" operator in the DSL.  The "in" operator is new
information that I did not posses when I made the decision to merge.
Because of this new information I'm un-merging and continuing the
discussion in the comments of
https://projects.puppetlabs.com/issues/19272

Reference: GH-130

lib/puppet/parser/functions/has_element.rb

@@ -1,28 +0,0 @@
-module Puppet::Parser::Functions
-
-  newfunction(:has_element, :type => :rvalue, :doc => <<-'ENDHEREDOC') do |args|
-    Determine if an array has an element with a matching value.
-
-    Example:
-
-        $my_array = ['key_one']
-        if has_element($my_array, 'key_two') {
-          notice('we will not reach here')
-        }
-        if has_element($my_array, 'key_one') {
-          notice('this will be printed')
-        }
-
-    ENDHEREDOC
-
-    unless args.length == 2
-      raise Puppet::ParseError, ("has_element(): wrong number of arguments (#{args.length}; must be 2)")
-    end
-    unless args[0].is_a?(Array)
-      raise Puppet::ParseError, "has_element(): expects the first argument to be an array, got #{args[0].inspect} which is of type #{args[0].class}"
-    end
-    args[0].include?(args[1])
-
-  end
-
-end

spec/unit/puppet/parser/functions/has_element_spec.rb

@@ -1,42 +0,0 @@
-#! /usr/bin/env ruby -S rspec
-require 'spec_helper'
-
-describe Puppet::Parser::Functions.function(:has_element) do
-  let(:scope) { PuppetlabsSpec::PuppetInternals.scope }
-
-  describe 'when calling has_element from puppet' do
-    it "should not compile when no arguments are passed" do
-      pending("Fails on 2.6.x, see bug #15912") if Puppet.version =~ /^2\.6\./
-      Puppet[:code] = '$x = has_element()'
-      expect {
-        scope.compiler.compile
-      }.to raise_error(Puppet::ParseError, /wrong number of arguments/)
-    end
-
-    it "should not compile when 1 argument is passed" do
-      pending("Fails on 2.6.x, see bug #15912") if Puppet.version =~ /^2\.6\./
-      Puppet[:code] = "$x = has_element('foo')"
-      expect {
-        scope.compiler.compile
-      }.to raise_error(Puppet::ParseError, /wrong number of arguments/)
-    end
-
-    it "should require the first value to be an Array" do
-      pending("Fails on 2.6.x, see bug #15912") if Puppet.version =~ /^2\.6\./
-      Puppet[:code] = "$x = has_element('foo', 'bar')"
-      expect {
-        scope.compiler.compile
-      }.to raise_error(Puppet::ParseError, /expects the first argument to be an array/)
-    end
-  end
-
-  describe 'when calling the function has_element from a scope instance' do
-    it 'should detect existing elements' do
-      scope.function_has_element([['one'], 'one']).should be_true
-    end
-
-    it 'should detect existing elements' do
-      scope.function_has_element([['one'], 'two']).should be_false
-    end
-  end
-end

tests/has_element.pp

@@ -1,9 +0,0 @@
-include stdlib
-
-$my_array = ['key_one']
-if has_element($my_array, 'key_two') {
-  notice('we will not reach here')
-}
-if has_element($my_array, 'key_one') {
-  notice('this will be printed')
-}