adds support for provider functions (#162)

* adds support for provider functions

Author: lkwg82

hcl2/hcl2.lark

@@ -27,6 +27,7 @@ expr_term : "(" new_line_or_comment? expression new_line_or_comment? ")"
             | index_expr_term
             | get_attr_expr_term
             | identifier
+            | provider_function_call 
             | heredoc_template
             | heredoc_template_trim
             | attr_splat_expr_term
@@ -55,6 +56,8 @@ heredoc_template_trim : /<<-(?P<heredoc_trim>[a-zA-Z][a-zA-Z0-9._-]+)\n(?:.|\n)*
 
 function_call : identifier "(" new_line_or_comment? arguments? new_line_or_comment? ")"
 arguments : (expression (new_line_or_comment* "," new_line_or_comment*  expression)* ("," | "...")? new_line_or_comment*)
+colons: "::"
+provider_function_call: identifier colons identifier colons  identifier  "(" new_line_or_comment? arguments? new_line_or_comment? ")"
 
 index_expr_term : expr_term index
 get_attr_expr_term : expr_term get_attr

hcl2/transformer.py

@@ -111,6 +111,14 @@ def function_call(self, args: List) -> str:
             args_str = ", ".join([str(arg) for arg in args[1] if arg is not Discard])
         return f"{args[0]}({args_str})"
 
+    def provider_function_call(self, args: List) -> str:
+        args = self.strip_new_line_tokens(args)
+        args_str = ""
+        if len(args) > 5:
+            args_str = ", ".join([str(arg) for arg in args[5] if arg is not Discard])
+        provider_func = "::".join([args[0],args[2],args[4]])
+        return f"{provider_func}({args_str})"
+
     def arguments(self, args: List) -> List:
         return args
 

test/helpers/terraform-config-json/provider_function.json

@@ -0,0 +1,8 @@
+{
+  "locals": [
+    {
+      "name2": "${provider::test2::test(\"a\")}",
+      "name3": "${test(\"a\")}"
+    }
+  ]
+}

test/helpers/terraform-config/provider_function.tf

@@ -0,0 +1,4 @@
+locals {
+  name2 = provider::test2::test("a")
+  name3 = test("a")
+}