RefactoringRope/RestructureDialog.py

# -*- coding: utf-8 -*-

# Copyright (c) 2011 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing the Restructure dialog.
"""

from PyQt4.QtCore import pyqtSlot
from PyQt4.QtGui import QDialogButtonBox, QAbstractButton

import rope.refactor.restructure

from Ui_RestructureDialog import Ui_RestructureDialog
from RefactoringDialogBase import RefactoringDialogBase


class RestructureDialog(RefactoringDialogBase, Ui_RestructureDialog):
    """
    Class implementing the Restructure dialog.
    """
    history = None
    
    def __init__(self, refactoring, title, parent=None):
        """
        Constructor
        
        @param refactoring reference to the main refactoring object
            (Refactoring)
        @param title title of the dialog (string)
        @param parent reference to the parent widget (QWidget)
        """
        RefactoringDialogBase.__init__(self, refactoring, title, parent)
        self.setupUi(self)
        
        self.__okButton = self.buttonBox.button(QDialogButtonBox.Ok)
        self.__okButton.setEnabled(False)
        self.__previewButton = self.buttonBox.addButton(
            self.trUtf8("Preview"), QDialogButtonBox.ActionRole)
        self.__previewButton.setDefault(True)
        
        self.__loadData()
    
    def __updateUI(self):
        """
        Private slot to update the UI.
        """
        self.__okButton.setEnabled(self.patternEdit.toPlainText() != "" and \
            self.goalEdit.toPlainText() != "")
    
    @pyqtSlot()
    def on_patternEdit_textChanged(self):
        """
        Private slot to react to changes of the pattern.
        """
        self.__updateUI()
    
    @pyqtSlot()
    def on_goalEdit_textChanged(self):
        """
        Private slot to react to changes of the goal.
        """
        self.__updateUI()
    
    @pyqtSlot(QAbstractButton)
    def on_buttonBox_clicked(self, button):
        """
        Private slot to act on the button pressed.
        
        @param button reference to the button pressed (QAbstractButton)
        """
        if button == self.__previewButton:
            self.previewChanges()
        elif button == self.__okButton:
            self.applyChanges()
    
    def _calculateChanges(self, handle):
        """
        Protected method to calculate the changes.
        
        @param handle reference to the task handle
            (rope.base.taskhandle.TaskHandle)
        @return reference to the Changes object (rope.base.change.ChangeSet)
        """
        self.__saveData()
        pattern = self.patternEdit.toPlainText()
        goal = self.goalEdit.toPlainText()
        imports = [line for line in self.importsEdit.toPlainText().splitlines()
                   if line.strip()]
        
        args = {}
        checks = self.argsEdit.toPlainText().splitlines()
        for check in checks:
            if ':' in check:
                splitted = check.split(':', 1)
                name = splitted[0].strip()
                value = splitted[1].strip()
                args[name] = value
        
        self._refactoring.getProject().validate(
            self._refactoring.getProject().root)
        try:
            restructuring = rope.refactor.restructure.Restructure(
                self._refactoring.getProject(), pattern, goal,
                args=args, imports=imports)
            changes = restructuring.get_changes(task_handle=handle)
        except Exception as err:
            self._refactoring.handleRopeError(err, self._title)
            return None
        
        return changes
    
    def __saveData(self):
        """
        Private slot to save the data for later reuse.
        """
        data = {'pattern': self.patternEdit.toPlainText(),
                'goal': self.goalEdit.toPlainText(),
                'checks': self.argsEdit.toPlainText(),
                'imports': self.importsEdit.toPlainText()
               }
        RestructureDialog.history = data

    def __loadData(self):
        """
        Private slot to load the history data into the dialog.
        """
        if RestructureDialog.history is not None:
            data = RestructureDialog.history
            self.patternEdit.setPlainText(data['pattern'])
            self.goalEdit.setPlainText(data['goal'])
            self.argsEdit.setPlainText(data['checks'])
            self.importsEdit.setPlainText(data['imports'])