make variables marker unified to be

ate/utils.py

@@ -2,8 +2,8 @@ import hashlib
 import json
 import os.path
 import random
+import re
 import string
-
 import yaml
 
 from ate.exception import ParamsError
@@ -190,3 +190,23 @@ def load_testcases_by_path(path):
 
     else:
         return []
+
+def parse_content_with_variables(content, variables_binds):
+    """ replace variables with bind value
+    """
+    # check if content includes ${variable}
+    matched = re.match(r"(.*)\$\{(.*)\}(.*)", content)
+    if matched:
+        # this is a variable, and will replace with its bind value
+        variable_name = matched.group(2)
+        value = variables_binds.get(variable_name)
+        if value is None:
+            raise ParamsError(
+                "%s is not defined in bind variables!" % variable_name)
+        if matched.group(1) or matched.group(3):
+            # e.g. /api/users/${uid}
+            return re.sub(r"\$\{.*\}", value, content)
+
+        return value
+
+    return content