anki/qt/aqt/editor.py

# -*- coding: utf-8 -*-
# Copyright: Ankitects Pty Ltd and contributors
# License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
import base64
import html
import itertools
import json
import mimetypes
import re
import unicodedata
import urllib.error
import urllib.parse
import urllib.request
import warnings
from typing import Callable, List, Optional, Tuple

import requests
from bs4 import BeautifulSoup

import aqt
import aqt.sound
from anki.hooks import runFilter
from anki.lang import _
from anki.sync import AnkiRequestsClient
from anki.utils import checksum, isWin, namedtmp, stripHTMLMedia
from aqt import AnkiQt, gui_hooks
from aqt.qt import *
from aqt.sound import getAudio
from aqt.utils import (
    getFile,
    openHelp,
    qtMenuShortcutWorkaround,
    shortcut,
    showInfo,
    showWarning,
    tooltip,
)
from aqt.webview import AnkiWebView

pics = ("jpg", "jpeg", "png", "tif", "tiff", "gif", "svg", "webp")
audio = (
    "wav",
    "mp3",
    "ogg",
    "flac",
    "mp4",
    "swf",
    "mov",
    "mpeg",
    "mkv",
    "m4a",
    "3gp",
    "spx",
    "oga",
    "webm",
)

_html = """
<style>
html { background: %s; }
#topbutsOuter { background: %s; }
</style>
<div id="topbutsOuter"><div id="topbuts" class="clearfix">%s</div></div>
<div id="fields"></div>
<div id="dupes" style="display:none;"><a href="#" onclick="pycmd('dupes');return false;">%s</a></div>
"""

# caller is responsible for resetting note on reset
class Editor:
    def __init__(self, mw: AnkiQt, widget, parentWindow, addMode=False):
        self.mw = mw
        self.widget = widget
        self.parentWindow = parentWindow
        self.note = None
        self.addMode = addMode
        self.currentField = None
        # current card, for card layout
        self.card = None
        self.setupOuter()
        self.setupWeb()
        self.setupShortcuts()
        self.setupTags()

    # Initial setup
    ############################################################

    def setupOuter(self):
        l = QVBoxLayout()
        l.setContentsMargins(0, 0, 0, 0)
        l.setSpacing(0)
        self.widget.setLayout(l)
        self.outerLayout = l

    def setupWeb(self):
        self.web = EditorWebView(self.widget, self)
        self.web.title = "editor"
        self.web.allowDrops = True
        self.web.onBridgeCmd = self.onBridgeCmd
        self.outerLayout.addWidget(self.web, 1)

        righttopbtns: List[str] = [
            self._addButton("text_bold", "bold", _("Bold text (Ctrl+B)"), id="bold"),
            self._addButton(
                "text_italic", "italic", _("Italic text (Ctrl+I)"), id="italic"
            ),
            self._addButton(
                "text_under", "underline", _("Underline text (Ctrl+U)"), id="underline"
            ),
            self._addButton(
                "text_super", "super", _("Superscript (Ctrl++)"), id="superscript"
            ),
            self._addButton("text_sub", "sub", _("Subscript (Ctrl+=)"), id="subscript"),
            self._addButton("text_clear", "clear", _("Remove formatting (Ctrl+R)")),
        ]
        # The color selection buttons do not use an icon so the HTML must be specified manually
        tip = _("Set foreground colour (F7)")
        righttopbtns.append(
            """<button tabindex=-1 class=linkb title="{}"
            type="button" onclick="pycmd('colour');return false;">
            <div id=forecolor style="display:inline-block; background: #000;border-radius: 5px;"
            class=topbut></div></button>""".format(
                tip
            )
        )
        tip = _("Change colour (F8)")
        righttopbtns.extend(
            [
                """<button tabindex=-1 class=linkb title="{}"
                type="button" onclick="pycmd('changeCol');return false;">
                <div style="display:inline-block; border-radius: 5px;"
                class="topbut rainbow"></div></button>""".format(
                    tip
                ),
                self._addButton(
                    "text_cloze", "cloze", _("Cloze deletion (Ctrl+Shift+C)")
                ),
                self._addButton(
                    "paperclip", "attach", _("Attach pictures/audio/video (F3)")
                ),
                self._addButton("media-record", "record", _("Record audio (F5)")),
                self._addButton("more", "more"),
            ]
        )
        gui_hooks.editor_did_init_buttons(righttopbtns, self)
        # legacy filter
        righttopbtns = runFilter("setupEditorButtons", righttopbtns, self)
        topbuts = """
            <div id="topbutsleft" style="float:left;">
                <button title='%(fldsTitle)s' onclick="pycmd('fields')">%(flds)s...</button>
                <button title='%(cardsTitle)s' onclick="pycmd('cards')">%(cards)s...</button>
            </div>
            <div id="topbutsright" style="float:right;">
                %(rightbts)s
            </div>
        """ % dict(
            flds=_("Fields"),
            cards=_("Cards"),
            rightbts="".join(righttopbtns),
            fldsTitle=_("Customize Fields"),
            cardsTitle=shortcut(_("Customize Card Templates (Ctrl+L)")),
        )
        bgcol = self.mw.app.palette().window().color().name()
        # then load page
        self.web.stdHtml(
            _html % (bgcol, bgcol, topbuts, _("Show Duplicates")),
            css=["editor.css"],
            js=["jquery.js", "editor.js"],
        )

    # Top buttons
    ######################################################################

    def resourceToData(self, path):
        """Convert a file (specified by a path) into a data URI."""
        if not os.path.exists(path):
            raise FileNotFoundError
        mime, _ = mimetypes.guess_type(path)
        with open(path, "rb") as fp:
            data = fp.read()
            data64 = b"".join(base64.encodebytes(data).splitlines())
            return "data:%s;base64,%s" % (mime, data64.decode("ascii"))

    def addButton(
        self,
        icon: str,
        cmd: str,
        func: Callable[["Editor"], None],
        tip: str = "",
        label: str = "",
        id: str = None,
        toggleable: bool = False,
        keys: str = None,
        disables: bool = True,
    ):
        """Assign func to bridge cmd, register shortcut, return button"""
        if cmd not in self._links:
            self._links[cmd] = func
        if keys:
            QShortcut(  # type: ignore
                QKeySequence(keys), self.widget, activated=lambda s=self: func(s),
            )
        btn = self._addButton(
            icon,
            cmd,
            tip=tip,
            label=label,
            id=id,
            toggleable=toggleable,
            disables=disables,
        )
        return btn

    def _addButton(
        self,
        icon: str,
        cmd: str,
        tip: str = "",
        label: str = "",
        id: Optional[str] = None,
        toggleable: bool = False,
        disables: bool = True,
    ):
        if icon:
            if icon.startswith("qrc:/"):
                iconstr = icon
            elif os.path.isabs(icon):
                iconstr = self.resourceToData(icon)
            else:
                iconstr = "/_anki/imgs/{}.png".format(icon)
            imgelm = """<img class=topbut src="{}">""".format(iconstr)
        else:
            imgelm = ""
        if label or not imgelm:
            labelelm = """<span class=blabel>{}</span>""".format(label or cmd)
        else:
            labelelm = ""
        if id:
            idstr = "id={}".format(id)
        else:
            idstr = ""
        if toggleable:
            toggleScript = "toggleEditorButton(this);"
        else:
            toggleScript = ""
        tip = shortcut(tip)
        theclass = "linkb"
        if not disables:
            theclass += " perm"
        return (
            '''<button tabindex=-1 {id} class="{theclass}" type="button" title="{tip}"'''
            """ onclick="pycmd('{cmd}');{togglesc}return false;">"""
            """{imgelm}{labelelm}</button>""".format(
                imgelm=imgelm,
                cmd=cmd,
                tip=tip,
                labelelm=labelelm,
                id=idstr,
                togglesc=toggleScript,
                theclass=theclass,
            )
        )

    def setupShortcuts(self):
        # if a third element is provided, enable shortcut even when no field selected
        cuts: List[Tuple] = [
            ("Ctrl+L", self.onCardLayout, True),
            ("Ctrl+B", self.toggleBold),
            ("Ctrl+I", self.toggleItalic),
            ("Ctrl+U", self.toggleUnderline),
            ("Ctrl++", self.toggleSuper),
            ("Ctrl+=", self.toggleSub),
            ("Ctrl+R", self.removeFormat),
            ("F7", self.onForeground),
            ("F8", self.onChangeCol),
            ("Ctrl+Shift+C", self.onCloze),
            ("Ctrl+Shift+Alt+C", self.onCloze),
            ("F3", self.onAddMedia),
            ("F5", self.onRecSound),
            ("Ctrl+T, T", self.insertLatex),
            ("Ctrl+T, E", self.insertLatexEqn),
            ("Ctrl+T, M", self.insertLatexMathEnv),
            ("Ctrl+M, M", self.insertMathjaxInline),
            ("Ctrl+M, E", self.insertMathjaxBlock),
            ("Ctrl+M, C", self.insertMathjaxChemistry),
            ("Ctrl+Shift+X", self.onHtmlEdit),
            ("Ctrl+Shift+T", self.onFocusTags, True),
        ]
        gui_hooks.editor_did_init_shortcuts(cuts, self)
        for row in cuts:
            if len(row) == 2:
                keys, fn = row  # pylint: disable=unbalanced-tuple-unpacking
                fn = self._addFocusCheck(fn)
            else:
                keys, fn, _ = row
            QShortcut(QKeySequence(keys), self.widget, activated=fn)

    def _addFocusCheck(self, fn):
        def checkFocus():
            if self.currentField is None:
                return
            fn()

        return checkFocus

    def onFields(self):
        self.saveNow(self._onFields)

    def _onFields(self):
        from aqt.fields import FieldDialog

        FieldDialog(self.mw, self.note, parent=self.parentWindow)

    def onCardLayout(self):
        self.saveNow(self._onCardLayout)

    def _onCardLayout(self):
        from aqt.clayout import CardLayout

        if self.card:
            ord = self.card.ord
        else:
            ord = 0
        CardLayout(
            self.mw, self.note, ord=ord, parent=self.parentWindow, addMode=self.addMode
        )
        if isWin:
            self.parentWindow.activateWindow()

    # JS->Python bridge
    ######################################################################

    def onBridgeCmd(self, cmd):
        if not self.note:
            # shutdown
            return
        # focus lost or key/button pressed?
        if cmd.startswith("blur") or cmd.startswith("key"):
            (type, ord, nid, txt) = cmd.split(":", 3)
            ord = int(ord)
            try:
                nid = int(nid)
            except ValueError:
                nid = 0
            if nid != self.note.id:
                print("ignored late blur")
                return
            txt = urllib.parse.unquote(txt)
            txt = unicodedata.normalize("NFC", txt)
            txt = self.mungeHTML(txt)
            # misbehaving apps may include a null byte in the text
            txt = txt.replace("\x00", "")
            # reverse the url quoting we added to get images to display
            txt = self.mw.col.media.escapeImages(txt, unescape=True)
            self.note.fields[ord] = txt
            if not self.addMode:
                self.note.flush()
                self.mw.requireReset()
            if type == "blur":
                self.currentField = None
                # run any filters
                if gui_hooks.editor_did_unfocus_field(False, self.note, ord):
                    # something updated the note; update it after a subsequent focus
                    # event has had time to fire
                    self.mw.progress.timer(100, self.loadNoteKeepingFocus, False)
                else:
                    self.checkValid()
            else:
                gui_hooks.editor_did_fire_typing_timer(self.note)
                self.checkValid()
        # focused into field?
        elif cmd.startswith("focus"):
            (type, num) = cmd.split(":", 1)
            self.currentField = int(num)
            gui_hooks.editor_did_focus_field(self.note, self.currentField)
        elif cmd in self._links:
            self._links[cmd](self)
        else:
            print("uncaught cmd", cmd)

    def mungeHTML(self, txt):
        if txt in ("<br>", "<div><br></div>"):
            return ""
        return txt

    # Setting/unsetting the current note
    ######################################################################

    def setNote(self, note, hide=True, focusTo=None):
        "Make NOTE the current note."
        self.note = note
        self.currentField = None
        if self.note:
            self.loadNote(focusTo=focusTo)
        else:
            self.hideCompleters()
            if hide:
                self.widget.hide()

    def loadNoteKeepingFocus(self):
        self.loadNote(self.currentField)

    def loadNote(self, focusTo=None):
        if not self.note:
            return

        data = [
            (fld, self.mw.col.media.escapeImages(val)) for fld, val in self.note.items()
        ]
        self.widget.show()
        self.updateTags()

        def oncallback(arg):
            if not self.note:
                return
            self.setupForegroundButton()
            self.checkValid()
            if focusTo is not None:
                self.web.setFocus()
            gui_hooks.editor_did_load_note(self)

        js = "setFields(%s); setFonts(%s); focusField(%s); setNoteId(%s)" % (
            json.dumps(data),
            json.dumps(self.fonts()),
            json.dumps(focusTo),
            json.dumps(self.note.id),
        )
        self.web.evalWithCallback(js, oncallback)

    def fonts(self):
        return [
            (gui_hooks.editor_will_use_font_for_field(f["font"]), f["size"], f["rtl"])
            for f in self.note.model()["flds"]
        ]

    def saveNow(self, callback, keepFocus=False):
        "Save unsaved edits then call callback()."
        if not self.note:
            # calling code may not expect the callback to fire immediately
            self.mw.progress.timer(10, callback, False)
            return
        self.saveTags()
        self.web.evalWithCallback("saveNow(%d)" % keepFocus, lambda res: callback())

    def checkValid(self):
        cols = ["#fff"] * len(self.note.fields)
        err = self.note.dupeOrEmpty()
        if err == 2:
            cols[0] = "#fcc"
            self.web.eval("showDupes();")
        else:
            self.web.eval("hideDupes();")
        self.web.eval("setBackgrounds(%s);" % json.dumps(cols))

    def showDupes(self):
        contents = stripHTMLMedia(self.note.fields[0])
        browser = aqt.dialogs.open("Browser", self.mw)
        browser.form.searchEdit.lineEdit().setText(
            '"dupe:%s,%s"' % (self.note.model()["id"], contents)
        )
        browser.onSearchActivated()

    def fieldsAreBlank(self, previousNote=None):
        if not self.note:
            return True
        m = self.note.model()
        for c, f in enumerate(self.note.fields):
            notChangedvalues = {"", "<br>"}
            if previousNote and m["flds"][c]["sticky"]:
                notChangedvalues.add(previousNote.fields[c])
            if f not in notChangedvalues:
                return False
        return True

    def cleanup(self):
        self.setNote(None)
        # prevent any remaining evalWithCallback() events from firing after C++ object deleted
        self.web = None

    # HTML editing
    ######################################################################

    def onHtmlEdit(self):
        field = self.currentField
        self.saveNow(lambda: self._onHtmlEdit(field))

    def _onHtmlEdit(self, field):
        d = QDialog(self.widget)
        form = aqt.forms.edithtml.Ui_Dialog()
        form.setupUi(d)
        form.buttonBox.helpRequested.connect(lambda: openHelp("editor"))
        form.textEdit.setPlainText(self.note.fields[field])
        form.textEdit.moveCursor(QTextCursor.End)
        d.exec_()
        html = form.textEdit.toPlainText()
        # filter html through beautifulsoup so we can strip out things like a
        # leading </div>
        with warnings.catch_warnings() as w:
            warnings.simplefilter("ignore", UserWarning)
            html = str(BeautifulSoup(html, "html.parser"))
        self.note.fields[field] = html
        self.note.flush()
        self.loadNote(focusTo=field)

    # Tag handling
    ######################################################################

    def setupTags(self):
        import aqt.tagedit

        g = QGroupBox(self.widget)
        g.setFlat(True)
        tb = QGridLayout()
        tb.setSpacing(12)
        tb.setContentsMargins(6, 6, 6, 6)
        # tags
        l = QLabel(_("Tags"))
        tb.addWidget(l, 1, 0)
        self.tags = aqt.tagedit.TagEdit(self.widget)
        self.tags.lostFocus.connect(self.saveTags)
        self.tags.setToolTip(shortcut(_("Jump to tags with Ctrl+Shift+T")))
        tb.addWidget(self.tags, 1, 1)
        g.setLayout(tb)
        self.outerLayout.addWidget(g)

    def updateTags(self):
        if self.tags.col != self.mw.col:
            self.tags.setCol(self.mw.col)
        if not self.tags.text() or not self.addMode:
            self.tags.setText(self.note.stringTags().strip())

    def saveTags(self):
        if not self.note:
            return
        tagsTxt = unicodedata.normalize("NFC", self.tags.text())
        self.note.tags = self.mw.col.tags.canonify(self.mw.col.tags.split(tagsTxt))
        self.tags.setText(self.mw.col.tags.join(self.note.tags).strip())
        if not self.addMode:
            self.note.flush()
        gui_hooks.editor_did_update_tags(self.note)

    def saveAddModeVars(self):
        if self.addMode:
            # save tags to model
            m = self.note.model()
            m["tags"] = self.note.tags
            self.mw.col.models.save(m, updateReqs=False)

    def hideCompleters(self):
        self.tags.hideCompleter()

    def onFocusTags(self):
        self.tags.setFocus()

    # Format buttons
    ######################################################################

    def toggleBold(self):
        self.web.eval("setFormat('bold');")

    def toggleItalic(self):
        self.web.eval("setFormat('italic');")

    def toggleUnderline(self):
        self.web.eval("setFormat('underline');")

    def toggleSuper(self):
        self.web.eval("setFormat('superscript');")

    def toggleSub(self):
        self.web.eval("setFormat('subscript');")

    def removeFormat(self):
        self.web.eval("setFormat('removeFormat');")

    def onCloze(self):
        self.saveNow(self._onCloze, keepFocus=True)

    def _onCloze(self):
        # check that the model is set up for cloze deletion
        if not re.search("{{(.*:)*cloze:", self.note.model()["tmpls"][0]["qfmt"]):
            if self.addMode:
                tooltip(
                    _(
                        "Warning, cloze deletions will not work until "
                        "you switch the type at the top to Cloze."
                    )
                )
            else:
                showInfo(
                    _(
                        """\
To make a cloze deletion on an existing note, you need to change it \
to a cloze type first, via Edit>Change Note Type."""
                    )
                )
                return
        # find the highest existing cloze
        highest = 0
        for name, val in list(self.note.items()):
            m = re.findall(r"\{\{c(\d+)::", val)
            if m:
                highest = max(highest, sorted([int(x) for x in m])[-1])
        # reuse last?
        if not self.mw.app.keyboardModifiers() & Qt.AltModifier:
            highest += 1
        # must start at 1
        highest = max(1, highest)
        self.web.eval("wrap2('{{c%d::', '}}');" % highest)

    # Foreground colour
    ######################################################################

    def setupForegroundButton(self):
        self.fcolour = self.mw.pm.profile.get("lastColour", "#00f")
        self.onColourChanged()

    # use last colour
    def onForeground(self):
        self._wrapWithColour(self.fcolour)

    # choose new colour
    def onChangeCol(self):
        new = QColorDialog.getColor(QColor(self.fcolour), None)
        # native dialog doesn't refocus us for some reason
        self.parentWindow.activateWindow()
        if new.isValid():
            self.fcolour = new.name()
            self.onColourChanged()
            self._wrapWithColour(self.fcolour)

    def _updateForegroundButton(self):
        self.web.eval("setFGButton('%s')" % self.fcolour)

    def onColourChanged(self):
        self._updateForegroundButton()
        self.mw.pm.profile["lastColour"] = self.fcolour

    def _wrapWithColour(self, colour):
        self.web.eval("setFormat('forecolor', '%s')" % colour)

    # Audio/video/images
    ######################################################################

    def onAddMedia(self):
        extension_filter = " ".join(
            "*." + extension for extension in sorted(itertools.chain(pics, audio))
        )
        key = _("Media") + " (" + extension_filter + ")"

        def accept(file):
            self.addMedia(file, canDelete=True)

        file = getFile(self.widget, _("Add Media"), accept, key, key="media")
        self.parentWindow.activateWindow()

    def addMedia(self, path, canDelete=False):
        html = self._addMedia(path, canDelete)
        self.web.eval("setFormat('inserthtml', %s);" % json.dumps(html))

    def _addMedia(self, path, canDelete=False):
        "Add to media folder and return local img or sound tag."
        # copy to media folder
        fname = self.mw.col.media.addFile(path)
        # remove original?
        if canDelete and self.mw.pm.profile["deleteMedia"]:
            if os.path.abspath(fname) != os.path.abspath(path):
                try:
                    os.unlink(path)
                except:
                    pass
        # return a local html link
        return self.fnameToLink(fname)

    def _addMediaFromData(self, fname, data):
        return self.mw.col.media.writeData(fname, data)

    def onRecSound(self):
        try:
            file = getAudio(self.widget)
        except Exception as e:
            showWarning(
                _("Couldn't record audio. Have you installed 'lame'?")
                + "\n\n"
                + repr(str(e))
            )
            return
        if file:
            self.addMedia(file)

    # Media downloads
    ######################################################################

    def urlToLink(self, url):
        fname = self.urlToFile(url)
        if not fname:
            return None
        return self.fnameToLink(fname)

    def fnameToLink(self, fname):
        ext = fname.split(".")[-1].lower()
        if ext in pics:
            name = urllib.parse.quote(fname.encode("utf8"))
            return '<img src="%s">' % name
        else:
            aqt.sound.clearAudioQueue()
            aqt.sound.play(fname)
            return "[sound:%s]" % fname

    def urlToFile(self, url):
        l = url.lower()
        for suffix in pics + audio:
            if l.endswith("." + suffix):
                return self._retrieveURL(url)
        # not a supported type
        return

    def isURL(self, s):
        s = s.lower()
        return (
            s.startswith("http://")
            or s.startswith("https://")
            or s.startswith("ftp://")
            or s.startswith("file://")
        )

    def inlinedImageToFilename(self, txt):
        prefix = "data:image/"
        suffix = ";base64,"
        for ext in ("jpg", "jpeg", "png", "gif"):
            fullPrefix = prefix + ext + suffix
            if txt.startswith(fullPrefix):
                b64data = txt[len(fullPrefix) :].strip()
                data = base64.b64decode(b64data, validate=True)
                if ext == "jpeg":
                    ext = "jpg"
                return self._addPastedImage(data, "." + ext)

        return ""

    def inlinedImageToLink(self, src):
        fname = self.inlinedImageToFilename(src)
        if fname:
            return self.fnameToLink(fname)

        return ""

    # ext should include dot
    def _addPastedImage(self, data, ext):
        # hash and write
        csum = checksum(data)
        fname = "{}-{}{}".format("paste", csum, ext)
        return self._addMediaFromData(fname, data)

    def _retrieveURL(self, url):
        "Download file into media folder and return local filename or None."
        # urllib doesn't understand percent-escaped utf8, but requires things like
        # '#' to be escaped.
        url = urllib.parse.unquote(url)
        if url.lower().startswith("file://"):
            url = url.replace("%", "%25")
            url = url.replace("#", "%23")
            local = True
        else:
            local = False
        # fetch it into a temporary folder
        self.mw.progress.start(immediate=not local, parent=self.parentWindow)
        ct = None
        try:
            if local:
                req = urllib.request.Request(
                    url, None, {"User-Agent": "Mozilla/5.0 (compatible; Anki)"}
                )
                filecontents = urllib.request.urlopen(req).read()
            else:
                reqs = AnkiRequestsClient()
                reqs.timeout = 30
                r = reqs.get(url)
                if r.status_code != 200:
                    showWarning(_("Unexpected response code: %s") % r.status_code)
                    return
                filecontents = r.content
                ct = r.headers.get("content-type")
        except urllib.error.URLError as e:
            showWarning(_("An error occurred while opening %s") % e)
            return
        except requests.exceptions.RequestException as e:
            showWarning(_("An error occurred while opening %s") % e)
            return
        finally:
            self.mw.progress.finish()
        # strip off any query string
        url = re.sub(r"\?.*?$", "", url)
        path = urllib.parse.unquote(url)
        return self.mw.col.media.writeData(path, filecontents, typeHint=ct)

    # Paste/drag&drop
    ######################################################################

    removeTags = ["script", "iframe", "object", "style"]

    def _pastePreFilter(self, html, internal):
        with warnings.catch_warnings() as w:
            warnings.simplefilter("ignore", UserWarning)
            doc = BeautifulSoup(html, "html.parser")

        if not internal:
            for tag in self.removeTags:
                for node in doc(tag):
                    node.decompose()

            # convert p tags to divs
            for node in doc("p"):
                node.name = "div"

        for tag in doc("img"):
            try:
                src = tag["src"]
            except KeyError:
                # for some bizarre reason, mnemosyne removes src elements
                # from missing media
                continue

            # in internal pastes, rewrite mediasrv references to relative
            if internal:
                m = re.match(r"http://127.0.0.1:\d+/(.*)$", src)
                if m:
                    tag["src"] = m.group(1)
            else:
                # in external pastes, download remote media
                if self.isURL(src):
                    fname = self._retrieveURL(src)
                    if fname:
                        tag["src"] = fname
                elif src.startswith("data:image/"):
                    # and convert inlined data
                    tag["src"] = self.inlinedImageToFilename(src)

        html = str(doc)
        return html

    def doPaste(self, html, internal, extended=False):
        html = self._pastePreFilter(html, internal)
        if extended:
            extended = "true"
        else:
            extended = "false"
        self.web.eval(
            "pasteHTML(%s, %s, %s);"
            % (json.dumps(html), json.dumps(internal), extended)
        )

    def doDrop(self, html, internal):
        self.web.evalWithCallback(
            "makeDropTargetCurrent();", lambda _: self.doPaste(html, internal)
        )

    def onPaste(self):
        self.web.onPaste()

    def onCutOrCopy(self):
        self.web.flagAnkiText()

    # Advanced menu
    ######################################################################

    def onAdvanced(self):
        m = QMenu(self.mw)

        for text, handler, shortcut in (
            (_("MathJax inline"), self.insertMathjaxInline, "Ctrl+M, M"),
            (_("MathJax block"), self.insertMathjaxBlock, "Ctrl+M, E"),
            (_("MathJax chemistry"), self.insertMathjaxChemistry, "Ctrl+M, C"),
            (_("LaTeX"), self.insertLatex, "Ctrl+T, T"),
            (_("LaTeX equation"), self.insertLatexEqn, "Ctrl+T, E"),
            (_("LaTeX math env."), self.insertLatexMathEnv, "Ctrl+T, M"),
            (_("Edit HTML"), self.onHtmlEdit, "Ctrl+Shift+X"),
        ):
            a = m.addAction(text)
            a.triggered.connect(handler)
            a.setShortcut(QKeySequence(shortcut))

        qtMenuShortcutWorkaround(m)

        m.exec_(QCursor.pos())

    # LaTeX
    ######################################################################

    def insertLatex(self):
        self.web.eval("wrap2('[latex]', '[/latex]');")

    def insertLatexEqn(self):
        self.web.eval("wrap2('[$]', '[/$]');")

    def insertLatexMathEnv(self):
        self.web.eval("wrap2('[$$]', '[/$$]');")

    def insertMathjaxInline(self):
        self.web.eval("wrap2('\\\\(', '\\\\)');")

    def insertMathjaxBlock(self):
        self.web.eval("wrap2('\\\\[', '\\\\]');")

    def insertMathjaxChemistry(self):
        self.web.eval("wrap2('\\\\(\\\\ce{', '}\\\\)');")

    # Links from HTML
    ######################################################################

    _links = dict(
        fields=onFields,
        cards=onCardLayout,
        bold=toggleBold,
        italic=toggleItalic,
        underline=toggleUnderline,
        super=toggleSuper,
        sub=toggleSub,
        clear=removeFormat,
        colour=onForeground,
        changeCol=onChangeCol,
        cloze=onCloze,
        attach=onAddMedia,
        record=onRecSound,
        more=onAdvanced,
        dupes=showDupes,
        paste=onPaste,
        cutOrCopy=onCutOrCopy,
    )


# Pasting, drag & drop, and keyboard layouts
######################################################################


class EditorWebView(AnkiWebView):
    def __init__(self, parent, editor):
        AnkiWebView.__init__(self)
        self.editor = editor
        self.strip = self.editor.mw.pm.profile["stripHTML"]
        self.setAcceptDrops(True)
        self._markInternal = False
        clip = self.editor.mw.app.clipboard()
        clip.dataChanged.connect(self._onClipboardChange)

    def _onClipboardChange(self):
        if self._markInternal:
            self._markInternal = False
            self._flagAnkiText()

    def onCut(self):
        self.triggerPageAction(QWebEnginePage.Cut)

    def onCopy(self):
        self.triggerPageAction(QWebEnginePage.Copy)

    def _onPaste(self, mode):
        extended = not (self.editor.mw.app.queryKeyboardModifiers() & Qt.ShiftModifier)
        mime = self.editor.mw.app.clipboard().mimeData(mode=mode)
        html, internal = self._processMime(mime)
        if not html:
            return
        self.editor.doPaste(html, internal, extended)

    def onPaste(self):
        self._onPaste(QClipboard.Clipboard)

    def onMiddleClickPaste(self):
        self._onPaste(QClipboard.Selection)

    def dropEvent(self, evt):
        mime = evt.mimeData()

        if evt.source() and mime.hasHtml():
            # don't filter html from other fields
            html, internal = mime.html(), True
        else:
            html, internal = self._processMime(mime)

        if not html:
            return

        self.editor.doDrop(html, internal)

    # returns (html, isInternal)
    def _processMime(self, mime):
        # print("html=%s image=%s urls=%s txt=%s" % (
        #     mime.hasHtml(), mime.hasImage(), mime.hasUrls(), mime.hasText()))
        # print("html", mime.html())
        # print("urls", mime.urls())
        # print("text", mime.text())

        # try various content types in turn
        html, internal = self._processHtml(mime)
        if html:
            return html, internal

        # favour url if it's a local link
        if mime.hasUrls() and mime.urls()[0].toString().startswith("file://"):
            types = (self._processUrls, self._processImage, self._processText)
        else:
            types = (self._processImage, self._processUrls, self._processText)

        for fn in types:
            html = fn(mime)
            if html:
                return html, False
        return "", False

    def _processUrls(self, mime):
        if not mime.hasUrls():
            return

        buf = ""
        for url in mime.urls():
            url = url.toString()
            # chrome likes to give us the URL twice with a \n
            url = url.splitlines()[0]
            buf += self.editor.urlToLink(url) or ""

        return buf

    def _processText(self, mime):
        if not mime.hasText():
            return

        txt = mime.text()

        # inlined data in base64?
        if txt.startswith("data:image/"):
            return self.editor.inlinedImageToLink(txt)

        # if the user is pasting an image or sound link, convert it to local
        if self.editor.isURL(txt):
            url = txt.split("\r\n")[0]
            link = self.editor.urlToLink(url)
            if link:
                return link

            # not media; add it as a normal link if pasting with shift
            link = '<a href="{}">{}</a>'.format(url, html.escape(txt))
            return link

        # normal text; convert it to HTML
        txt = html.escape(txt)
        txt = txt.replace("\n", "<br>").replace("\t", " " * 4)

        # if there's more than one consecutive space,
        # use non-breaking spaces for the second one on
        def repl(match):
            return match.group(1).replace(" ", "&nbsp;") + " "

        txt = re.sub(" ( +)", repl, txt)

        return txt

    def _processHtml(self, mime):
        if not mime.hasHtml():
            return None, False
        html = mime.html()

        # no filtering required for internal pastes
        if html.startswith("<!--anki-->"):
            return html[11:], True

        return html, False

    def _processImage(self, mime):
        if not mime.hasImage():
            return
        im = QImage(mime.imageData())
        uname = namedtmp("paste")
        if self.editor.mw.pm.profile.get("pastePNG", False):
            ext = ".png"
            im.save(uname + ext, None, 50)
        else:
            ext = ".jpg"
            im.save(uname + ext, None, 80)

        # invalid image?
        path = uname + ext
        if not os.path.exists(path):
            return

        data = open(path, "rb").read()
        fname = self.editor._addPastedImage(data, ext)
        if fname:
            return self.editor.fnameToLink(fname)

    def flagAnkiText(self):
        # be ready to adjust when clipboard event fires
        self._markInternal = True

    def _flagAnkiText(self):
        # add a comment in the clipboard html so we can tell text is copied
        # from us and doesn't need to be stripped
        clip = self.editor.mw.app.clipboard()
        if not isMac and not clip.ownsClipboard():
            return
        mime = clip.mimeData()
        if not mime.hasHtml():
            return
        html = mime.html()
        mime.setHtml("<!--anki-->" + html)
        clip.setMimeData(mime)

    def contextMenuEvent(self, evt):
        m = QMenu(self)
        a = m.addAction(_("Cut"))
        a.triggered.connect(self.onCut)
        a = m.addAction(_("Copy"))
        a.triggered.connect(self.onCopy)
        a = m.addAction(_("Paste"))
        a.triggered.connect(self.onPaste)
        gui_hooks.editor_will_show_context_menu(self, m)
        m.popup(QCursor.pos())


# QFont returns "Kozuka Gothic Pro L" but WebEngine expects "Kozuka Gothic Pro Light"
# - there may be other cases like a trailing 'Bold' that need fixing, but will
# wait for further reports first.
def fontMungeHack(font):
    return re.sub(" L$", " Light", font)


gui_hooks.editor_will_use_font_for_field.append(fontMungeHack)