Error Handling

class RopeError(Exception):
    """
    Base exception class for all rope errors.
    All rope-specific exceptions inherit from this class.
    """
    pass

class RefactoringError(RopeError):
    """
    General refactoring error for operations that cannot be completed safely.
    Raised when a refactoring violates safety constraints or encounters
    unsupported code patterns.
    """
    pass

class InterruptedTaskError(RopeError):
    """
    Raised when a refactoring task is cancelled or interrupted.
    Can occur when using TaskHandle to monitor long-running operations.
    """
    pass

class ResourceNotFoundError(RopeError):
    """
    Raised when attempting to access a resource that doesn't exist.
    Common when using project.get_resource() with invalid paths.
    """
    pass

class ModuleNotFoundError(RopeError):
    """
    Raised when a Python module cannot be found or loaded.
    Occurs during module resolution in project.get_module() operations.
    """
    pass

class AttributeNotFoundError(RopeError):
    """
    Raised when attempting to access a non-existent attribute.
    Can occur during code analysis and refactoring operations.
    """
    pass

class NameNotFoundError(RopeError):
    """
    Raised when name resolution fails during code analysis.
    Indicates that a referenced identifier cannot be resolved.
    """
    pass

class BadIdentifierError(RopeError):
    """
    Raised when an invalid identifier is provided for refactoring.
    Common in rename operations with non-Python identifiers.
    """
    pass

class ModuleSyntaxError(RopeError):
    """
    Raised when a Python module contains syntax errors.
    Can occur during parsing and analysis operations.
    """
    pass

class ModuleDecodeError(RopeError):
    """
    Raised when a Python file cannot be decoded due to encoding issues.
    Occurs when reading files with invalid or unsupported encodings.
    """
    pass

class HistoryError(RopeError):
    """
    Raised when history operations fail.
    Can occur during undo/redo operations or history corruption.
    """
    pass

from rope.base.project import Project
from rope.base.exceptions import RopeError, ResourceNotFoundError, RefactoringError
from rope.refactor.rename import Rename

project = Project('/path/to/project')

try:
    # Attempt to get a resource
    try:
        myfile = project.get_resource('nonexistent.py')
    except ResourceNotFoundError:
        print("File not found, creating new file")
        myfile = project.get_file('nonexistent.py')
        myfile.write('# New file\n')
    
    # Attempt refactoring with error handling
    try:
        renamer = Rename(project, myfile, 50)
        old_name = renamer.get_old_name()
        changes = renamer.get_changes('new_name')
        project.do(changes)
        print(f"Successfully renamed '{old_name}' to 'new_name'")
        
    except RefactoringError as e:
        print(f"Refactoring failed: {e}")
        # Handle refactoring-specific errors
        
    except BadIdentifierError as e:
        print(f"Invalid identifier: {e}")
        # Handle identifier validation errors
        
except RopeError as e:
    print(f"Rope error occurred: {e}")
    # Handle any rope-specific error
    
except Exception as e:
    print(f"Unexpected error: {e}")
    # Handle unexpected errors
    
finally:
    project.close()

from rope.base.project import Project
from rope.base.exceptions import ModuleNotFoundError, ModuleSyntaxError, ModuleDecodeError

project = Project('/path/to/project')

try:
    # Handle various module loading errors
    try:
        module = project.get_module('mymodule')
        print(f"Module loaded: {module}")
        
    except ModuleNotFoundError:
        print("Module not found in project or Python path")
        # Try alternative module names or create module
        
    except ModuleSyntaxError as e:
        print(f"Module has syntax errors: {e}")
        # Report syntax issues to user
        
    except ModuleDecodeError as e:
        print(f"Cannot decode module file: {e}")
        # Handle encoding issues
        
finally:
    project.close()

from rope.base.project import Project
from rope.base.taskhandle import TaskHandle
from rope.base.exceptions import InterruptedTaskError
from rope.refactor.rename import Rename

def cancel_callback():
    # Custom cancellation logic
    return user_requested_cancel()

project = Project('/path/to/project')

try:
    # Create task handle with cancellation support
    task_handle = TaskHandle("Rename operation", cancel_callback)
    
    try:
        myfile = project.get_resource('mymodule.py')
        renamer = Rename(project, myfile, 100)
        changes = renamer.get_changes('new_name', task_handle=task_handle)
        project.do(changes, task_handle)
        print("Refactoring completed successfully")
        
    except InterruptedTaskError:
        print("Operation was cancelled by user")
        # Clean up partial changes if necessary
        
finally:
    project.close()

from rope.base.project import Project
from rope.base.exceptions import *
from rope.refactor.extract import ExtractMethod

def safe_refactor(project_path, file_path, start_offset, end_offset, method_name):
    """
    Safely perform extract method refactoring with comprehensive error handling.
    """
    project = None
    try:
        project = Project(project_path)
        
        # Resource access with error handling
        try:
            resource = project.get_resource(file_path)
        except ResourceNotFoundError:
            return {"error": f"File not found: {file_path}"}
        
        # Refactoring with error handling
        try:
            extractor = ExtractMethod(project, resource, start_offset, end_offset)
            changes = extractor.get_changes(method_name)
            
            # Validate changes before applying
            description = changes.get_description()
            print(f"About to apply: {description}")
            
            project.do(changes)
            return {"success": f"Extracted method '{method_name}'"}
            
        except RefactoringError as e:
            return {"error": f"Refactoring failed: {e}"}
            
        except BadIdentifierError as e:
            return {"error": f"Invalid method name '{method_name}': {e}"}
            
        except InterruptedTaskError:
            return {"error": "Operation was cancelled"}
            
        except ModuleSyntaxError as e:
            return {"error": f"Syntax error in file: {e}"}
            
    except RopeError as e:
        return {"error": f"Rope error: {e}"}
        
    except Exception as e:
        return {"error": f"Unexpected error: {e}"}
        
    finally:
        if project:
            project.close()

# Usage
result = safe_refactor(
    "/path/to/project",
    "mymodule.py", 
    200, 350,
    "extracted_method"
)

if "error" in result:
    print(f"Error: {result['error']}")
else:
    print(f"Success: {result['success']}")

from rope.base.project import Project
from rope.base.exceptions import *

def robust_rename(project_path, file_path, offset, new_name, max_retries=3):
    """
    Perform rename with automatic retry and error recovery.
    """
    project = Project(project_path)
    
    try:
        resource = project.get_resource(file_path)
        
        for attempt in range(max_retries + 1):
            try:
                from rope.refactor.rename import Rename
                renamer = Rename(project, resource, offset)
                
                # Validate before proceeding
                try:
                    old_name = renamer.get_old_name()
                    print(f"Attempt {attempt + 1}: Renaming '{old_name}' to '{new_name}'")
                except AttributeNotFoundError:
                    print("No identifier found at offset")
                    return False
                
                changes = renamer.get_changes(new_name)
                project.do(changes)
                print("Rename successful")
                return True
                
            except BadIdentifierError as e:
                print(f"Invalid identifier on attempt {attempt + 1}: {e}")
                if attempt == max_retries:
                    print("All attempts failed - invalid identifier")
                    return False
                # Could try with modified identifier
                
            except RefactoringError as e:
                print(f"Refactoring error on attempt {attempt + 1}: {e}")
                if attempt == max_retries:
                    print("All attempts failed - refactoring error")
                    return False
                # Could try with different parameters
                
            except InterruptedTaskError:
                print("Operation cancelled")
                return False
                
    except ResourceNotFoundError:
        print(f"File not found: {file_path}")
        return False
        
    finally:
        project.close()
    
    return False