Properly handle escapes within HCL strings (closes amplify-education#171

)

hcl2/transformer.py

@@ -281,15 +281,31 @@ def to_string_dollar(self, value: Any) -> Any:
         """Wrap a string in ${ and }"""
         if isinstance(value, str):
             if value.startswith('"') and value.endswith('"'):
-                return str(value)[1:-1]
+                value = str(value)[1:-1]
+                return self.process_escape_sequences(value)
             return f"${{{value}}}"
         return value
 
     def strip_quotes(self, value: Any) -> Any:
         """Remove quote characters from the start and end of a string"""
         if isinstance(value, str):
             if value.startswith('"') and value.endswith('"'):
-                return str(value)[1:-1]
+                value = str(value)[1:-1]
+                return self.process_escape_sequences(value)
+        return value
+
+    def process_escape_sequences(self, value: str) -> str:
+        """Process HCL escape sequences within quoted template expressions."""
+        if isinstance(value, str):
+            # normal escape sequences
+            value = value.replace("\\n", "\n")
+            value = value.replace("\\r", "\r")
+            value = value.replace("\\t", "\t")
+            value = value.replace('\\"', '"')
+            value = value.replace("\\\\", "\\")
+
+            # we will leave Unicode escapes (\uNNNN and \UNNNNNNNN) untouched
+            # for now, but this method can be extended in the future
         return value
 
     def identifier(self, value: Any) -> Any:

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

@@ -0,0 +1,9 @@
+{
+    "block": [
+        {
+            "block_with_newlines": {
+                "a": "line1\nline2"
+            }
+        }
+    ]
+}

test/helpers/terraform-config/escapes.tf

@@ -0,0 +1,3 @@
+block "block_with_newlines" {
+  a = "line1\nline2"
+}