add puppet stdlib

[dsa-puppet.git] / modules / stdlib / lib / puppet / parser / functions / validate_string.rb

diff --git a/modules/stdlib/lib/puppet/parser/functions/validate_string.rb b/modules/stdlib/lib/puppet/parser/functions/validate_string.rb
new file mode 100644 (file)
index 0000000..e667794
--- /dev/null
+++ b/modules/stdlib/lib/puppet/parser/functions/validate_string.rb
@@ -0,0 +1,33 @@
+module Puppet::Parser::Functions
+
+  newfunction(:validate_string, :doc => <<-'ENDHEREDOC') do |args|
+    Validate that all passed values are string data structures. Abort catalog
+    compilation if any value fails this check.
+
+    The following values will pass:
+
+        $my_string = "one two"
+        validate_string($my_string, 'three')
+
+    The following values will fail, causing compilation to abort:
+
+        validate_string(true)
+        validate_string([ 'some', 'array' ])
+        $undefined = undef
+        validate_string($undefined)
+
+    ENDHEREDOC
+
+    unless args.length > 0 then
+      raise Puppet::ParseError, ("validate_string(): wrong number of arguments (#{args.length}; must be > 0)")
+    end
+
+    args.each do |arg|
+      unless arg.is_a?(String)
+        raise Puppet::ParseError, ("#{arg.inspect} is not a string.  It looks to be a #{arg.class}")
+      end
+    end
+
+  end
+
+end