RefactoringRope/ChangeSignatureDialog.py

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

# Copyright (c) 2010 - 2021 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing the Change Signature dialog.
"""

import copy

from PyQt5.QtCore import pyqtSlot, Qt
from PyQt5.QtWidgets import (
    QDialog, QDialogButtonBox, QListWidgetItem, QAbstractButton
)

from .Ui_ChangeSignatureDialog import Ui_ChangeSignatureDialog
from .RefactoringDialogBase import RefactoringDialogBase


class ChangeSignatureDialog(RefactoringDialogBase, Ui_ChangeSignatureDialog):
    """
    Class implementing the Change Signature dialog.
    """
    NameRole = Qt.UserRole
    IsAddedRole = Qt.UserRole + 1
    DefaultRole = Qt.UserRole + 2
    ValueRole = Qt.UserRole + 3
    
    def __init__(self, refactoring, title, filename, offset, parent=None):
        """
        Constructor
        
        @param refactoring reference to the main refactoring object
        @type RefactoringServer
        @param title title of the dialog
        @type str
        @param filename file name to be worked on
        @type str
        @param offset offset within file
        @type int or None
        @param parent reference to the parent widget
        @type QWidget
        """
        RefactoringDialogBase.__init__(self, refactoring, title, parent)
        self.setupUi(self)
        
        self._changeGroupName = "ChangeSignature"
        
        self.__filename = filename
        self.__offset = offset
        
        self.__definition_info = []
        self.__to_be_removed = []
        
        self.__okButton = self.buttonBox.button(QDialogButtonBox.Ok)
        self.__previewButton = self.buttonBox.addButton(
            self.tr("Preview"), QDialogButtonBox.ActionRole)
        self.__previewButton.setDefault(True)
        
        self._refactoring.sendJson("RequestSignature", {
            "ChangeGroup": self._changeGroupName,
            "Title": self._title,
            "FileName": self.__filename,
            "Offset": self.__offset,
        })
    
    def __processSignature(self, data):
        """
        Private method to process the inline type data sent by the refactoring
        client in order to polish the dialog.
        
        @param data dictionary containing the inline type data
        @type dict
        """
        self.__definition_info = data["DefinitionInfo"]
        
        # populate the parameters list
        for arg, default in self.__definition_info:
            itm = (
                QListWidgetItem(arg, self.parameterList)
                if default is None else
                QListWidgetItem("{0}={1}".format(arg, default),
                                self.parameterList)
            )
            itm.setData(ChangeSignatureDialog.NameRole, arg)
            itm.setData(ChangeSignatureDialog.IsAddedRole, False)
            itm.setData(ChangeSignatureDialog.DefaultRole, None)
            itm.setData(ChangeSignatureDialog.ValueRole, None)
        
        if self.parameterList.count():
            self.parameterList.setCurrentRow(0)
        else:
            self.on_parameterList_currentRowChanged(-1)
    
    @pyqtSlot(int)
    def on_parameterList_currentRowChanged(self, currentRow):
        """
        Private slot called, when the current row is changed.
        
        @param currentRow index of the current row
        @type int
        """
        if currentRow == -1:
            self.upButton.setEnabled(False)
            self.downButton.setEnabled(False)
            self.removeButton.setEnabled(False)
        else:
            maxIndex = self.parameterList.count() - 1
            self.upButton.setEnabled(currentRow != 0)
            self.downButton.setEnabled(currentRow != maxIndex)
    
    @pyqtSlot()
    def on_upButton_clicked(self):
        """
        Private slot called to move the selected item up in the list.
        """
        row = self.parameterList.currentRow()
        if row == 0:
            # we're already at the top
            return
        
        itm = self.parameterList.takeItem(row)
        self.parameterList.insertItem(row - 1, itm)
        self.parameterList.setCurrentItem(itm)
        if row == 1:
            self.upButton.setEnabled(False)
        else:
            self.upButton.setEnabled(True)
        self.downButton.setEnabled(True)
    
    @pyqtSlot()
    def on_downButton_clicked(self):
        """
        Private slot called to move the selected item down in the list.
        """
        rows = self.parameterList.count()
        row = self.parameterList.currentRow()
        if row == rows - 1:
            # we're already at the end
            return
        
        itm = self.parameterList.takeItem(row)
        self.parameterList.insertItem(row + 1, itm)
        self.parameterList.setCurrentItem(itm)
        self.upButton.setEnabled(True)
        if row == rows - 2:
            self.downButton.setEnabled(False)
        else:
            self.downButton.setEnabled(True)
    
    @pyqtSlot()
    def on_removeButton_clicked(self):
        """
        Private slot to remove a parameter.
        """
        itm = self.parameterList.takeItem(self.parameterList.currentRow())
        self.__to_be_removed.append(itm)
    
    @pyqtSlot()
    def on_addButton_clicked(self):
        """
        Private slot to add a new parameter.
        """
        from .AddParameterDialog import AddParameterDialog
        dlg = AddParameterDialog(self)
        if dlg.exec() == QDialog.Accepted:
            name, default, value = dlg.getData()
            if default:
                s = "{0}={1}".format(name, default)
            else:
                s = name
            itm = QListWidgetItem(s)
            itm.setData(ChangeSignatureDialog.NameRole, name)
            itm.setData(ChangeSignatureDialog.IsAddedRole, True)
            if default:
                itm.setData(ChangeSignatureDialog.DefaultRole, default)
            else:
                itm.setData(ChangeSignatureDialog.DefaultRole, None)
            if value:
                itm.setData(ChangeSignatureDialog.ValueRole, value)
            else:
                itm.setData(ChangeSignatureDialog.ValueRole, None)
            if self.parameterList.count():
                self.parameterList.insertItem(
                    self.parameterList.currentRow() + 1, itm)
            else:
                self.parameterList.addItem(itm)
            self.parameterList.setCurrentItem(itm)
    
    @pyqtSlot(QAbstractButton)
    def on_buttonBox_clicked(self, button):
        """
        Private slot to act on the button pressed.
        
        @param button reference to the button pressed
        @type QAbstractButton
        """
        if button == self.__previewButton:
            self.requestPreview()
        elif button == self.__okButton:
            self.applyChanges()
    
    def __getParameterIndex(self, definition_info, name):
        """
        Private method to calculate the index of the given paramter.
        
        @param definition_info list of lists containing the method signature
            definition
        @type list of lists of two str
        @param name parameter name
        @type str
        @return index of the parameter
        @rtype int
        """
        for index, pair in enumerate(definition_info):
            if pair[0] == name:
                return index
        
        return -1

    def _calculateChanges(self):
        """
        Protected method to initiate the calculation of the changes.
        """
        removals = []
        definition_info = copy.deepcopy(self.__definition_info)
        for itm in self.__to_be_removed:
            if itm.data(ChangeSignatureDialog.IsAddedRole):
                continue
            index = self.__getParameterIndex(
                definition_info,
                itm.data(ChangeSignatureDialog.NameRole))
            if index >= 0:
                removals.append(index)
                del definition_info[index]
        
        additions = []
        for index in range(self.parameterList.count()):
            itm = self.parameterList.item(index)
            if itm.data(ChangeSignatureDialog.IsAddedRole):
                name = itm.data(ChangeSignatureDialog.NameRole)
                default = itm.data(ChangeSignatureDialog.DefaultRole)
                value = itm.data(ChangeSignatureDialog.ValueRole)
                additions.append([index, name, default, value])
                try:
                    definition_info.insert(index, [name, default])
                except Exception as err:
                    self._refactoring.handleRopeError(err, self._title)
        
        newOrdering = []
        for row in range(self.parameterList.count()):
            itm = self.parameterList.item(row)
            name = itm.data(ChangeSignatureDialog.NameRole)
            index = self.__getParameterIndex(definition_info, name)
            if index >= 0:
                newOrdering.append(index)
        autodef = self.autodefEdit.text()
        if not autodef:
            autodef = None
        
        self._refactoring.sendJson("CalculateSignatureChanges", {
            "ChangeGroup": self._changeGroupName,
            "Title": self._title,
            "FileName": self.__filename,
            "Offset": self.__offset,
            "Removals": removals,
            "Additions": additions,
            "Ordering": newOrdering,
            "AutoDef": autodef,
            "Hierarchy": self.hierarchyCheckBox.isChecked(),
        })
    
    def processChangeData(self, data):
        """
        Public method to process the change data sent by the refactoring
        client.
        
        @param data dictionary containing the change data
        @type dict
        """
        subcommand = data["Subcommand"]
        if subcommand == "Signature":
            self.__processSignature(data)
        else:
            # pass on to base class
            RefactoringDialogBase.processChangeData(self, data)