Stable Test Build

diff_viewer.py

@@ -0,0 +1,42 @@
+import tkinter as tk
+from tkinter import ttk
+import difflib
+
+class DiffViewerDialog(tk.Toplevel):
+    def __init__(self, parent, expected: str, actual: str, title: str = "Output Diff"):
+        super().__init__(parent)
+        self.title(title)
+        self.geometry("900x600")
+        self.transient(parent)
+        self.grab_set()
+
+        paned = ttk.PanedWindow(self, orient=tk.HORIZONTAL)
+        paned.pack(fill="both", expand=True, padx=10, pady=10)
+
+        left_frame = ttk.Frame(paned)
+        right_frame = ttk.Frame(paned)
+        paned.add(left_frame, weight=1)
+        paned.add(right_frame, weight=1)
+
+        ttk.Label(left_frame, text="Expected Output", font=("Helvetica", 12, "bold")).pack(anchor="w")
+        self.expected_text = tk.Text(left_frame, wrap="word", bg="#f8f8f8")
+        self.expected_text.pack(fill="both", expand=True)
+        self.expected_text.insert("1.0", expected)
+        self.expected_text.configure(state="disabled")
+
+        ttk.Label(right_frame, text="Actual Output", font=("Helvetica", 12, "bold")).pack(anchor="w")
+        self.actual_text = tk.Text(right_frame, wrap="word", bg="#f8f8f8")
+        self.actual_text.pack(fill="both", expand=True)
+        self.actual_text.insert("1.0", actual)
+        self.actual_text.configure(state="disabled")
+
+        # Diff summary at the bottom
+        diff = list(difflib.unified_diff(
+            expected.splitlines(), actual.splitlines(), lineterm='', n=3,
+            fromfile='expected', tofile='actual'))
+        diff_str = '\n'.join(diff) if diff else 'No differences.'
+        ttk.Label(self, text="Diff Summary", font=("Helvetica", 11, "bold")).pack(anchor="w", padx=10)
+        diff_box = tk.Text(self, height=8, wrap="none", bg="#f0f0f0")
+        diff_box.pack(fill="x", padx=10, pady=(0,10))
+        diff_box.insert("1.0", diff_str)
+        diff_box.configure(state="disabled")