文字列一括置換ツール(PySide)

main.py

# -*- encoding: shift-jis -*-
import sys
import os
from PySide import QtCore
from PySide import QtGui
from replace import MultiReplace

class MainWindow(QtGui.QDialog):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        self.setAcceptDrops(True)
        self.resize(480, 180)
        self.setWindowFlags(QtCore.Qt.WindowStaysOnTopHint)
        self._label = QtGui.QLabel('')
        self._label.setAlignment(QtCore.Qt.AlignVCenter|QtCore.Qt.AlignHCenter)
        self._multi_replace = None
        self._reset_button = QtGui.QPushButton('リセット')
        self._reset_button.clicked.connect(self.reset)
        layout = QtGui.QVBoxLayout()
        layout.addWidget(self._label)
        layout.addWidget(self._reset_button)
        self.setLayout(layout)
        self.reset()

    def reset(self):
        self._label.setText('<font color=blue size=24>設定ファイルをドラッグ＆ドロップ</font>')
        self._multi_replace = None

    def dropEvent(self, event):
        path = event.mimeData().urls()[0].toLocalFile()
        if self._multi_replace:
            self.replace(path)
        else:
            self.load_multi_replace(path)

    def replace(self, path):
        save_file, filter = QtGui.QFileDialog.getSaveFileName(self, 
            caption='置換済みファイルの保存',
            dir=os.path.dirname(path),
            filter="Text File (*.txt)")
        if not save_file:
            return
        self._multi_replace.replace(path, save_file)
        self.reset()

    def load_multi_replace(self, path):
        self._multi_replace = MultiReplace().load(path)
        self._label.setText('<font color=green size=24>置換対象ファイルをドラッグ＆ドロップ</font>')
    
    def dragEnterEvent(self,event):
        if event.mimeData().hasUrls():
            event.accept()
        else:
            event.ignore()

if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    name = '一括置換ツール'
    app.setApplicationName(name)
    mainWindow = MainWindow()
    mainWindow.setWindowTitle(name)
    mainWindow.show()
    app.exec_()

replace.py

# -*- encoding: shift-jis -*

class ReplaceTargets(object):
    def __init__(self):
        self._targets = list()

    def load(self, file_name):
        with open(file_name, 'r') as file:
            lines = file.readlines()
        self._targets = [line.strip().split('\t') for line in lines]
        return self

    def replace(self, str):
        for src, dst in self._targets:
            str = str.replace(src, dst)
        return str

class MultiReplace(object):
    def __init__(self):
        self._replace_targets = ReplaceTargets()

    def load(self, file):
        self._replace_targets.load(file)
        return self

    def replace(self, src, dst):
        with open(src, 'r') as file:
            lines = file.readlines()
        with open(dst, 'w') as file:
            file.writelines([self._replace_targets.replace(line) for line in lines])