adding default code

code_editor.py

@@ -1,18 +1,34 @@
 # code_editor.py
+
 import streamlit as st
 import streamlit_ace as st_ace
 from utils import execute_code
 
+DEFAULT_SNIPPETS = {
+    "Python": '''# default code\na = int(input())\nb = int(input())\nprint("Sum:", a + b)''',
+    "C": '''// default code\n#include <stdio.h>\nint main() {\n    int a, b;\n    scanf("%d %d", &a, &b);\n    printf("Sum: %d\\n", a + b);\n    return 0;\n}''',
+    "C++": '''// default code\n#include <iostream>\nusing namespace std;\nint main() {\n    int a, b;\n    cin >> a >> b;\n    cout << "Sum: " << a + b << endl;\n    return 0;\n}''',
+    "Java": '''// default code\nimport java.util.Scanner;\npublic class Program {\n    public static void main(String[] args) {\n        Scanner sc = new Scanner(System.in);\n        int a = sc.nextInt();\n        int b = sc.nextInt();\n        System.out.println("Sum: " + (a + b));\n    }\n}''',
+    "JavaScript": '''// default code\nconst readline = require('readline');\nconst rl = readline.createInterface({ input: process.stdin, output: process.stdout });\nlet inputs = [];\nrl.on('line', (line) => {\n  inputs.push(parseInt(line));\n  if (inputs.length === 2) {\n    console.log("Sum:", inputs[0] + inputs[1]);\n    rl.close();\n  }\n});''',
+    "C#": '''// default code\nusing System;\npublic class Program {\n    public static void Main(string[] args) {\n        int a = Convert.ToInt32(Console.ReadLine());\n        int b = Convert.ToInt32(Console.ReadLine());\n        Console.WriteLine("Sum: " + (a + b));\n    }\n}'''
+}
+
+
 def render_code_editor(selected_lang, ace_theme, editor_key):
     st.subheader("Editor")
-    default_snippet = {
-        "Python": '''# default code\na = int(input())\nb = int(input())\nprint("Sum:", a + b)''',
-        "C": '''// default code\n#include <stdio.h>\nint main() {\n    int a, b;\n    scanf("%d %d", &a, &b);\n    printf("Sum: %d\\n", a + b);\n    return 0;\n}''',
-        "C++": '''// default code\n#include <iostream>\nusing namespace std;\nint main() {\n    int a, b;\n    cin >> a >> b;\n    cout << "Sum: " << a + b << endl;\n    return 0;\n}''',
-        "Java": '''// default code\nimport java.util.Scanner;\npublic class Program {\n    public static void main(String[] args) {\n        Scanner sc = new Scanner(System.in);\n        int a = sc.nextInt();\n        int b = sc.nextInt();\n        System.out.println("Sum: " + (a + b));\n    }\n}''',
-        "JavaScript": '''// default code\nconst readline = require('readline');\nconst rl = readline.createInterface({ input: process.stdin, output: process.stdout });\nlet inputs = [];\nrl.on('line', (line) => {\n  inputs.push(parseInt(line));\n  if (inputs.length === 2) {\n    console.log("Sum:", inputs[0] + inputs[1]);\n    rl.close();\n  }\n});''',
-        "C#": '''// default code\nusing System;\npublic class Program {\n    public static void Main(string[] args) {\n        int a = Convert.ToInt32(Console.ReadLine());\n        int b = Convert.ToInt32(Console.ReadLine());\n        Console.WriteLine("Sum: " + (a + b));\n    }\n}'''
-    }
+
+    # Initialize default code if needed
+    default_code = DEFAULT_SNIPPETS[selected_lang]
+    if (
+        st.session_state.get("code") is None
+        or st.session_state.code.strip() == ""
+        or st.session_state.get("prev_language") != selected_lang
+        or st.session_state.code.strip() == DEFAULT_SNIPPETS.get(st.session_state.get("prev_language", ""), "")
+    ):
+        st.session_state.code = default_code
+        st.session_state.prev_language = selected_lang
+
+    # Code Editor
     code = st_ace.st_ace(
         value=st.session_state.code,
         placeholder=f"Start typing your {selected_lang} code…",
@@ -30,6 +46,7 @@ def render_code_editor(selected_lang, ace_theme, editor_key):
     if code != st.session_state.code:
         st.session_state.code = code
 
+    # Input box
     user_input = st.text_area(
         label="📥 Input (stdin)",
         value=st.session_state.stdin,
@@ -40,6 +57,7 @@ def render_code_editor(selected_lang, ace_theme, editor_key):
     if user_input != st.session_state.stdin:
         st.session_state.stdin = user_input
 
+    # Run Button
     if st.button("▶️ Run"):
         out, err, exc = execute_code(
             code=st.session_state.code,
@@ -49,6 +67,7 @@ def render_code_editor(selected_lang, ace_theme, editor_key):
         st.session_state.code_output = out
         st.session_state.error_output = err or exc
 
+    # Output Display
     if st.session_state.get("code_output"):
         st.text_area("Output", st.session_state.code_output, height=120)