Fix python evaluation of arithmetic statements with no spaces (#32911)

scripts/py_matter_yamltests/matter_yamltests/parser.py

@@ -1223,7 +1223,8 @@ def _config_variable_substitution(self, value):
             # But some other tests were relying on the fact that the expression was put 'as if' in
             # the generated code and was resolved before being sent over the wire. For such
             # expressions (e.g 'myVar + 1') we need to compute it before sending it over the wire.
-            tokens = value.split()
+            delimiter_regex = "(\ |\(|\)|\+|\-|\*|\/|\%)"
+            tokens = re.split(delimiter_regex, value)
             if len(tokens) == 0:
                 return value
 
@@ -1240,7 +1241,7 @@ def _config_variable_substitution(self, value):
                 return tokens[0]
 
             tokens = [str(token) for token in tokens]
-            value = ' '.join(tokens)
+            value = ''.join(tokens)
             # TODO we should move away from eval. That will mean that we will need to do extra
             # parsing, but it would be safer then just blindly running eval.
             return value if not substitution_occured else eval(value)

scripts/py_matter_yamltests/test_yaml_parser.py

@@ -48,6 +48,9 @@
       <attribute side="server" code="0x0024" type="TestEnum" writable="true" optional="false">test_enum</attribute>
 
       <command source="client" code="1" name="test"></command>
+      <command source="client" code="2" name="IntTest">
+        <arg name="arg" type="int8u"/>
+      </command>
     </cluster>
   </configurator>
 '''
@@ -175,6 +178,81 @@
           value: TestEnum.UnknownEnumValue(0)
 '''
 
+_BASIC_ARITHMETIC_ARG_RESULTS = [6, 6, 2, 2, 8, 8, 2, 2, 1]
+basic_arithmetic_yaml = '''
+name: Test Cluster Tests
+
+config:
+    nodeId: 0x12344321
+    cluster: "Test"
+    endpoint: 1
+    myVariable: 4
+
+tests:
+    - label: "Add 2"
+      command: "IntTest"
+      arguments:
+          values:
+              - name: "arg"
+                value: myVariable + 2
+
+    - label: "Add 2 with no space"
+      command: "IntTest"
+      arguments:
+          values:
+              - name: "arg"
+                value: myVariable+2
+
+    - label: "Minus 2"
+      command: "IntTest"
+      arguments:
+          values:
+              - name: "arg"
+                value: myVariable - 2
+
+    - label: "Minus 2 with no space"
+      command: "IntTest"
+      arguments:
+          values:
+              - name: "arg"
+                value: myVariable-2
+
+    - label: "Multiply by 2"
+      command: "IntTest"
+      arguments:
+          values:
+              - name: "arg"
+                value: myVariable * 2
+
+    - label: "Multiply by 2 with no space"
+      command: "IntTest"
+      arguments:
+          values:
+              - name: "arg"
+                value: myVariable*2
+
+    - label: "Divide by 2"
+      command: "IntTest"
+      arguments:
+          values:
+              - name: "arg"
+                value: myVariable / 2
+
+    - label: "Divide by 2 with no space"
+      command: "IntTest"
+      arguments:
+          values:
+              - name: "arg"
+                value: myVariable/2
+
+    - label: "Arithmetic with parentheses"
+      command: "IntTest"
+      arguments:
+          values:
+              - name: "arg"
+                value: (myVariable +3)/7
+'''
+
 
 def mock_open_with_parameter_content(content):
     file_object = mock_open(read_data=content).return_value
@@ -207,6 +285,17 @@ def test_config(self):
             self.assertEqual(test_step.cluster, 'Test')
             self.assertEqual(test_step.endpoint, 1)
 
+    def test_basic_arithmetic(self):
+        parser_config = TestParserConfig(None, self._definitions)
+
+        yaml_parser = TestParser(basic_arithmetic_yaml, parser_config)
+        for idx, test_step in enumerate(yaml_parser.tests):
+            values = test_step.arguments['values']
+            self.assertEqual(len(values), 1)
+            value = values[0]
+            self.assertEqual(value['name'], 'arg')
+            self.assertEqual(value['value'], _BASIC_ARITHMETIC_ARG_RESULTS[idx])
+
     def test_config_override(self):
         config_override = {'nodeId': 12345,
                            'cluster': 'TestOverride', 'endpoint': 4}