[MODULES-2462] Improve parseyaml function

* Add default value support
  Second argument will be returned if yaml cannot be parsed
  instead of false value
* Update tests

1 files changed, 12 insertions, 11 deletions

diff --git a/lib/puppet/parser/functions/parsejson.rb b/lib/puppet/parser/functions/parsejson.rb
index a9a16a4..f822fc4 100644
--- a/lib/puppet/parser/functions/parsejson.rb
+++ b/lib/puppet/parser/functions/parsejson.rb
@@ -3,21 +3,22 @@
 #
 
 module Puppet::Parser::Functions
-  newfunction(:parsejson, :type => :rvalue, :doc => <<-EOS
-This function accepts JSON as a string and converts into the correct Puppet
-structure.
-    EOS
+  newfunction(:parsejson, :type => :rvalue, :arity => -2, :doc => <<-EOS
+This function accepts JSON as a string and converts it into the correct
+Puppet structure.
+
+The optional second argument can be used to pass a default value that will
+be returned if the parsing of YAML string have failed.
+  EOS
   ) do |arguments|
+    raise ArgumentError, 'Wrong number of arguments. 1 or 2 arguments should be provided.' unless arguments.length >= 1
 
-    if (arguments.size != 1) then
-      raise(Puppet::ParseError, "parsejson(): Wrong number of arguments "+
-        "given #{arguments.size} for 1")
+    begin
+      PSON::load(arguments[0]) || arguments[1]
+    rescue Exception
+      arguments[1]
     end
 
-    json = arguments[0]
-
-    # PSON is natively available in puppet
-    PSON.load(json)
   end
 end