use $$ to escape $ notation

httprunner/parser.py

@@ -7,6 +7,8 @@ import re
 from httprunner import exceptions, utils, validator
 from httprunner.compat import basestring, builtin_str, numeric_types, str
 
+# use $$ to escape $ notation
+dolloar_regex_compile = re.compile(r"\$\$")
 # TODO: change variable notation from $var to {{var}}
 # $var_1
 variable_regex_compile = re.compile(r"\$(\w+)")
@@ -447,7 +449,16 @@ class LazyString(object):
 
         while match_start_position < len(raw_string):
 
-            # Notice: functions must be handled before variables
+            # Notice: notation priority
+            # $$ > ${func($a, $b)} > $var
+
+            # search $$
+            dollar_match = dolloar_regex_compile.match(raw_string, match_start_position)
+            if dollar_match:
+                match_start_position = dollar_match.end()
+                self._string += "$"
+                continue
+
             # search function like ${func($a, $b)}
             func_match = function_regex_compile.match(raw_string, match_start_position)
             if func_match:

tests/test_parser.py

@@ -336,10 +336,20 @@ class TestParserBasic(unittest.TestCase):
         self.assertEqual(var.to_value(variables_mapping), "ABCabc}")
 
         var = parser.LazyString("ABC$$var_1{", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC$var_1{{")
+        self.assertEqual(var._args, [])
+        self.assertEqual(var.to_value(variables_mapping), "ABC$var_1{")
+
+        var = parser.LazyString("ABC$$$var_1{", functions_mapping, check_variables_set)
         self.assertEqual(var._string, "ABC${}{{")
         self.assertEqual(var._args, ["var_1"])
         self.assertEqual(var.to_value(variables_mapping), "ABC$abc{")
 
+        var = parser.LazyString("ABC$$$$var_1{", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC$$var_1{{")
+        self.assertEqual(var._args, [])
+        self.assertEqual(var.to_value(variables_mapping), "ABC$$var_1{")
+
         var = parser.LazyString("ABC$var_1${", functions_mapping, check_variables_set)
         self.assertEqual(var._string, "ABC{}${{")
         self.assertEqual(var._args, ["var_1"])