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-rw-r--r--lib/puppet/functions/is_a.rb32
1 files changed, 32 insertions, 0 deletions
diff --git a/lib/puppet/functions/is_a.rb b/lib/puppet/functions/is_a.rb
new file mode 100644
index 0000000..da98b03
--- /dev/null
+++ b/lib/puppet/functions/is_a.rb
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+# Boolean check to determine whether a variable is of a given data type. This is equivalent to the `=~` type checks.
+#
+# @example how to check a data type
+# # check a data type
+# foo = 3
+# $bar = [1,2,3]
+# $baz = 'A string!'
+#
+# if $foo.is_a(Integer) {
+# notify { 'foo!': }
+# }
+# if $bar.is_a(Array) {
+# notify { 'bar!': }
+# }
+# if $baz.is_a(String) {
+# notify { 'baz!': }
+# }
+#
+# See the documentation for "The Puppet Type System" for more information about types.
+# See the `assert_type()` function for flexible ways to assert the type of a value.
+#
+Puppet::Functions.create_function(:is_a) do
+ dispatch :is_a do
+ param 'Any', :value
+ param 'Type', :type
+ end
+
+ def is_a(value, type)
+ # See puppet's lib/puppet/pops/evaluator/evaluator_impl.rb eval_MatchExpression
+ Puppet::Pops::Types::TypeCalculator.instance?(type, value)
+ end
+end