ProjectWeb/Html5ToJsConverter.py

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

# Copyright (c) 2014 - 2024 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing the HTML5 to JavaScript converter.
"""

import datetime
import getpass
import os
import re

from bs4 import BeautifulSoup
from PyQt6.QtCore import QObject
from PyQt6.QtWidgets import QDialog

from .Html5ToJsConverterParameterDialog import Html5ToJsConverterParameterDialog


class Html5ToJsConverter(QObject):
    """
    Class implementing the HTML5 to JavaScript converter.
    """

    JsTemplate8 = "{0}{1}{2}{3}{4}{5}{6}{7}"
    TagsToIgnore = (
        "head",
        "meta",
        "noscript",
        "script",
        "style",
        "link",
        "no-js",
        "title",
        "object",
        "col",
        "colgroup",
        "option",
        "param",
        "audio",
        "basefont",
        "isindex",
        "svg",
        "area",
        "embed",
        "br",
    )

    def __init__(self, html, parent=None):
        """
        Constructor

        @param html HTML text to be converted
        @type str
        @param parent reference to the parent object
        @type QObject
        """
        super().__init__(parent)

        self.__html = html

    def getJavaScript(self):
        """
        Public method to get the converted JavaScript text.

        @return JavaScript text
        @rtype str
        """
        dlg = Html5ToJsConverterParameterDialog()
        if dlg.exec() == QDialog.DialogCode.Accepted:
            indentation, scriptTags = dlg.getData()

            self.__createSoup()

            alreadyDone = list(self.TagsToIgnore)

            js = "<script>{0}".format(os.linesep) if scriptTags else ""
            js += "// {0} by {1}{2}".format(
                datetime.datetime.now().isoformat().split(".")[0],
                getpass.getuser(),
                os.linesep,
            )
            js += "$(document).ready(function(){" + os.linesep

            # step 1: IDs
            js += "/*{0}*/{1}".format("-" * 75, os.linesep)
            for id_ in self.__getIds():
                if id_ not in alreadyDone:
                    js += "{0}// {1}{2}".format(
                        indentation, "#".join(id_).lower(), os.linesep
                    )
                    js += self.JsTemplate8.format(
                        indentation,
                        "var ",
                        re.sub(
                            "[^a-z0-9]",
                            "",
                            id_[1].lower()
                            if len(id_[1]) < 11
                            else re.sub("[aeiou]", "", id_[1].lower()),
                        ),
                        " = ",
                        '$("#{0}").length'.format(id_[1]),
                        ";",
                        os.linesep,
                        os.linesep,
                    )
                    alreadyDone.append(id_)

            # step 2: classes
            js += "/*{0}*/{1}".format("-" * 75, os.linesep)
            for class_ in self.__getClasses():
                if class_ not in alreadyDone:
                    js += "{0}// {1}{2}".format(
                        indentation, ".".join(class_).lower(), os.linesep
                    )
                    js += self.JsTemplate8.format(
                        indentation,
                        "var ",
                        re.sub(
                            "[^a-z0-9]",
                            "",
                            class_[1].lower()
                            if len(class_[1]) < 11
                            else re.sub("[aeiou]", "", class_[1].lower()),
                        ),
                        " = ",
                        '$(".{0}").length'.format(class_[1]),
                        ";",
                        os.linesep,
                        os.linesep,
                    )
                    alreadyDone.append(class_)

            js += "})"
            js += "{0}</script>".format(os.linesep) if scriptTags else ""
        else:
            js = ""
        return js.strip()

    def __createSoup(self):
        """
        Private method to get a BeaitifulSoup object with our HTML text.
        """
        self.__soup = BeautifulSoup(BeautifulSoup(self.__html).prettify())

    def __getClasses(self):
        """
        Private method to extract all classes of the HTML text.

        @return list of tuples containing the tag name and its classes
            as a blank separated string
        @rtype list of tuples of (str, str)
        """
        classes = [
            (t.name, " ".join(t["class"]))
            for t in self.__soup.find_all(True, {"class": True})
        ]
        return sorted(set(classes))

    def __getIds(self):
        """
        Private method to extract all IDs of the HTML text.

        @return list of tuples containing the tag name and its ID
        @rtype list of tuples of (str, str)
        """
        ids = [(t.name, t["id"]) for t in self.__soup.find_all(True, {"id": True})]
        return sorted(set(ids))