fix(json_utils): fix function find_json_objects (#2289)

Co-authored-by: dongzhancai1 <dongzhancai1@jd.com>
Co-authored-by: aries_ckt <916701291@qq.com>

dbgpt/util/json_utils.py

@@ -48,6 +48,7 @@ def find_json_objects(text):
     escape_character = False
     stack = []
     start_index = -1
+    modified_text = list(text)  # Convert text to a list for easy modification
 
     for i, char in enumerate(text):
         # Handle escape characters
@@ -59,12 +60,12 @@ def find_json_objects(text):
         if char == '"' and not escape_character:
             inside_string = not inside_string
 
-        if not inside_string and char == "\n":
-            continue
-        if inside_string and char == "\n":
-            char = "\\n"
-        if inside_string and char == "\t":
-            char = "\\t"
+        # Replace newline and tab characters inside strings
+        if inside_string:
+            if char == "\n":
+                modified_text[i] = "\\n"
+            elif char == "\t":
+                modified_text[i] = "\\t"
 
         # Handle opening brackets
         if char in "{[" and not inside_string:
@@ -78,7 +79,8 @@ def find_json_objects(text):
                 if not stack:
                     end_index = i + 1
                     try:
-                        json_obj = json.loads(text[start_index:end_index])
+                        json_str = "".join(modified_text[start_index:end_index])
+                        json_obj = json.loads(json_str)
                         json_objects.append(json_obj)
                     except json.JSONDecodeError:
                         pass

dbgpt/util/tests/test_json_utils.py

@@ -0,0 +1,64 @@
+import pytest
+
+from dbgpt.util.json_utils import find_json_objects
+
+# 定义参数化测试数据
+test_data = [
+    (
+        """
+        ```json
+
+          {
+            "serial_number": "1",
+            "agent": "CodeOptimizer",
+            "content": "```json
+select * 
+from table
+where column = 'value'
+``` optimize the code above.",
+            "rely": ""
+          }
+        ```
+        """,
+        [
+            {
+                "serial_number": "1",
+                "agent": "CodeOptimizer",
+                "content": "```json\nselect * \nfrom table\nwhere column = 'value'\n``` optimize the code above.",
+                "rely": "",
+            }
+        ],
+        "Test case with nested code block",
+    ),
+    (
+        """
+        {
+            "key": "value"
+        }
+        """,
+        [{"key": "value"}],
+        "Test case with simple JSON",
+    ),
+    (
+        """
+        {
+            "key1": "value1"
+        }
+        {
+            "key2": "value2"
+        }
+        """,
+        [{"key1": "value1"}, {"key2": "value2"}],
+        "Test case with multiple JSON objects",
+    ),
+    ("", [], "Test case with empty input"),
+    ("This is not a JSON string", [], "Test case with non-JSON input"),
+]
+
+
+@pytest.mark.parametrize("text, expected, description", test_data)
+def test_find_json_objects(text, expected, description):
+    result = find_json_objects(text)
+    assert (
+        result == expected
+    ), f"Test failed: {description}\nExpected: {expected}\nGot: {result}"