Add arithmetic operators to AST

This changeset adds +,-,/,*,<< and >> computation and
AST parse nodes.

1 files changed, 23 insertions, 0 deletions

diff --git a/lib/puppet/parser/ast/minus.rb b/lib/puppet/parser/ast/minus.rb
new file mode 100644
index 000000000..b0779a8ee
--- /dev/null
+++ b/lib/puppet/parser/ast/minus.rb
@@ -0,0 +1,23 @@
+require 'puppet'
+require 'puppet/parser/ast/branch'
+
+# An object that returns a boolean which is the boolean not
+# of the given value.
+class Puppet::Parser::AST
+    class Minus < AST::Branch
+        attr_accessor :value
+
+        def each
+            yield @value
+        end
+
+        def evaluate(scope)
+            val = @value.safeevaluate(scope)
+            val = Puppet::Parser::Scope.number?(val)
+            if val == nil
+                raise ArgumentError, "minus operand %s is not a number" % val
+            end
+            return -val
+        end
+    end
+end