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"""PySide2 port of the widgets/richtext/syntaxhighlighter example from Qt v5.x"""

import sys
import re
from PySide2.QtCore import (QFile, Qt, QTextStream)
from PySide2.QtGui import (QColor, QFont, QKeySequence, QSyntaxHighlighter,
    QTextCharFormat)
from PySide2.QtWidgets import (QApplication, QFileDialog, QMainWindow,
    QPlainTextEdit)

import syntaxhighlighter_rc


class MainWindow(QMainWindow):
    def __init__(self, parent=None):
        QMainWindow.__init__(self, parent)

        self.highlighter = Highlighter()

        self.setupFileMenu()
        self.setupEditor()

        self.setCentralWidget(self.editor)
        self.setWindowTitle(self.tr("Syntax Highlighter"))

    def newFile(self):
        self.editor.clear()

    def openFile(self, path = ""):
        fileName = path

        if not fileName:
            fileName, _ = QFileDialog.getOpenFileName(self, self.tr("Open File"), "",
                                                      "qmake Files (*.pro *.prf *.pri)")

        if fileName:
            inFile = QFile(fileName)
            if inFile.open(QFile.ReadOnly | QFile.Text):
                stream = QTextStream(inFile)
                self.editor.setPlainText(stream.readAll())

    def setupEditor(self):
        variableFormat = QTextCharFormat()
        variableFormat.setFontWeight(QFont.Bold)
        variableFormat.setForeground(Qt.blue)
        self.highlighter.addMapping("\\b[A-Z_]+\\b", variableFormat)

        singleLineCommentFormat = QTextCharFormat()
        singleLineCommentFormat.setBackground(QColor("#77ff77"))
        self.highlighter.addMapping("#[^\n]*", singleLineCommentFormat)

        quotationFormat = QTextCharFormat()
        quotationFormat.setBackground(Qt.cyan)
        quotationFormat.setForeground(Qt.blue)
        self.highlighter.addMapping("\".*\"", quotationFormat)

        functionFormat = QTextCharFormat()
        functionFormat.setFontItalic(True)
        functionFormat.setForeground(Qt.blue)
        self.highlighter.addMapping("\\b[a-z0-9_]+\\(.*\\)", functionFormat)

        font = QFont()
        font.setFamily("Courier")
        font.setFixedPitch(True)
        font.setPointSize(10)

        self.editor = QPlainTextEdit()
        self.editor.setFont(font)
        self.highlighter.setDocument(self.editor.document())

    def setupFileMenu(self):
        fileMenu = self.menuBar().addMenu(self.tr("&File"))

        newFileAct = fileMenu.addAction(self.tr("&New..."))
        newFileAct.setShortcut(QKeySequence(QKeySequence.New))
        newFileAct.triggered.connect(self.newFile)

        openFileAct = fileMenu.addAction(self.tr("&Open..."))
        openFileAct.setShortcut(QKeySequence(QKeySequence.Open))
        openFileAct.triggered.connect(self.openFile)

        quitAct = fileMenu.addAction(self.tr("E&xit"))
        quitAct.setShortcut(QKeySequence(QKeySequence.Quit))
        quitAct.triggered.connect(self.close)

        helpMenu = self.menuBar().addMenu("&Help")
        helpMenu.addAction("About &Qt", qApp.aboutQt)


class Highlighter(QSyntaxHighlighter):
    def __init__(self, parent=None):
        QSyntaxHighlighter.__init__(self, parent)

        self.mappings = {}

    def addMapping(self, pattern, format):
        self.mappings[pattern] = format

    def highlightBlock(self, text):
        for pattern in self.mappings:
            for m in re.finditer(pattern,text):
                s,e = m.span()
                self.setFormat(s, e - s, self.mappings[pattern])

if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = MainWindow()
    window.resize(640, 512)
    window.show()
    window.openFile(":/examples/example")
    sys.exit(app.exec_())
