src/eric7/UI/BrowserModel.py

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

# Copyright (c) 2006 - 2022 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing the browser model.
"""

import contextlib
import fnmatch
import json
import os

from PyQt6.QtCore import (
    QAbstractItemModel,
    QCoreApplication,
    QDir,
    QFileSystemWatcher,
    QModelIndex,
    QProcess,
    Qt,
)
from PyQt6.QtGui import QFont, QImageReader
from PyQt6.QtWidgets import QApplication

from eric7 import Preferences, Utilities
from eric7.EricGui import EricPixmapCache
from eric7.Utilities import ClassBrowsers
from eric7.Utilities.ClassBrowsers import ClbrBaseClasses

BrowserItemRoot = 0
BrowserItemDirectory = 1
BrowserItemSysPath = 2
BrowserItemFile = 3
BrowserItemClass = 4
BrowserItemMethod = 5
BrowserItemAttributes = 6
BrowserItemAttribute = 7
BrowserItemCoding = 8
BrowserItemImports = 9
BrowserItemImport = 10


class BrowserModel(QAbstractItemModel):
    """
    Class implementing the browser model.
    """

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

        @param parent reference to parent object (QObject)
        @param nopopulate flag indicating to not populate the model
            (boolean)
        """
        super().__init__(parent)

        self.progDir = None

        self.__sysPathInterpreter = ""
        self.__sysPathItem = None

        if not nopopulate:
            self.watchedItems = {}
            self.watchedFileItems = {}
            self.watcher = QFileSystemWatcher(self)
            self.watcher.directoryChanged.connect(self.directoryChanged)
            self.watcher.fileChanged.connect(self.fileChanged)

            rootData = QCoreApplication.translate("BrowserModel", "Name")
            self.rootItem = BrowserItem(None, rootData)

            self.__populateModel()

    def columnCount(self, parent=None):
        """
        Public method to get the number of columns.

        @param parent index of parent item (QModelIndex)
        @return number of columns (integer)
        """
        if parent is None:
            parent = QModelIndex()

        item = parent.internalPointer() if parent.isValid() else self.rootItem

        return item.columnCount() + 1

    def data(self, index, role):
        """
        Public method to get data of an item.

        @param index index of the data to retrieve (QModelIndex)
        @param role role of data (Qt.ItemDataRole)
        @return requested data
        """
        if not index.isValid():
            return None

        if role == Qt.ItemDataRole.DisplayRole:
            item = index.internalPointer()
            if index.column() < item.columnCount():
                return item.data(index.column())
            elif (
                index.column() == item.columnCount()
                and index.column() < self.columnCount(self.parent(index))
            ):
                # This is for the case where an item under a multi-column
                # parent doesn't have a value for all the columns
                return ""
        elif role == Qt.ItemDataRole.DecorationRole:
            if index.column() == 0:
                return index.internalPointer().getIcon()
        elif role == Qt.ItemDataRole.FontRole:
            item = index.internalPointer()
            if item.isSymlink():
                font = QFont(QApplication.font("QTreeView"))
                font.setItalic(True)
                return font

        return None

    def flags(self, index):
        """
        Public method to get the item flags.

        @param index index of the data to retrieve (QModelIndex)
        @return requested flags (Qt.ItemFlags)
        """
        if not index.isValid():
            return Qt.ItemFlag.ItemIsEnabled

        return Qt.ItemFlag.ItemIsEnabled | Qt.ItemFlag.ItemIsSelectable

    def headerData(self, section, orientation, role=Qt.ItemDataRole.DisplayRole):
        """
        Public method to get the header data.

        @param section number of section to get data for (integer)
        @param orientation header orientation (Qt.Orientation)
        @param role role of data (Qt.ItemDataRole)
        @return requested header data
        """
        if (
            orientation == Qt.Orientation.Horizontal
            and role == Qt.ItemDataRole.DisplayRole
        ):
            if section >= self.rootItem.columnCount():
                return ""
            else:
                return self.rootItem.data(section)

        return None

    def index(self, row, column, parent=None):
        """
        Public method to create an index.

        @param row row number of the new index (integer)
        @param column column number of the new index (integer)
        @param parent index of parent item (QModelIndex)
        @return index object (QModelIndex)
        """
        if parent is None:
            parent = QModelIndex()

        # The model/view framework considers negative values out-of-bounds,
        # however in python they work when indexing into lists. So make sure
        # we return an invalid index for out-of-bounds row/col
        if (
            row < 0
            or column < 0
            or row >= self.rowCount(parent)
            or column >= self.columnCount(parent)
        ):
            return QModelIndex()

        parentItem = parent.internalPointer() if parent.isValid() else self.rootItem

        try:
            if not parentItem.isPopulated():
                self.populateItem(parentItem)
            childItem = parentItem.child(row)
        except IndexError:
            childItem = None
        if childItem:
            return self.createIndex(row, column, childItem)
        else:
            return QModelIndex()

    def parent(self, index):
        """
        Public method to get the index of the parent object.

        @param index index of the item (QModelIndex)
        @return index of parent item (QModelIndex)
        """
        if not index.isValid():
            return QModelIndex()

        childItem = index.internalPointer()
        parentItem = childItem.parent()

        if parentItem is None or parentItem == self.rootItem:
            return QModelIndex()

        return self.createIndex(parentItem.row(), 0, parentItem)

    def rowCount(self, parent=None):
        """
        Public method to get the number of rows.

        @param parent index of parent item (QModelIndex)
        @return number of rows (integer)
        """
        if parent is None:
            parent = QModelIndex()

        # Only the first column should have children
        if parent.column() > 0:
            return 0

        if not parent.isValid():
            parentItem = self.rootItem
        else:
            parentItem = parent.internalPointer()
            if not parentItem.isPopulated():  # lazy population
                self.populateItem(parentItem)

        return parentItem.childCount()

    def hasChildren(self, parent=None):
        """
        Public method to check for the presence of child items.

        We always return True for normal items in order to do lazy
        population of the tree.

        @param parent index of parent item (QModelIndex)
        @return flag indicating the presence of child items (boolean)
        """
        if parent is None:
            parent = QModelIndex()

        # Only the first column should have children
        if parent.column() > 0:
            return 0

        if not parent.isValid():
            return self.rootItem.childCount() > 0

        if parent.internalPointer().isLazyPopulated():
            return True
        else:
            return parent.internalPointer().childCount() > 0

    def clear(self):
        """
        Public method to clear the model.
        """
        self.beginResetModel()
        self.rootItem.removeChildren()
        self.endResetModel()

    def item(self, index):
        """
        Public method to get a reference to an item.

        @param index index of the data to retrieve (QModelIndex)
        @return requested item reference (BrowserItem)
        """
        if not index.isValid():
            return None

        return index.internalPointer()

    def _addWatchedItem(self, itm):
        """
        Protected method to watch an item.

        @param itm item to be watched (BrowserDirectoryItem)
        """
        if isinstance(itm, BrowserDirectoryItem):
            dirName = itm.dirName()
            if (
                dirName != ""
                and not dirName.startswith("//")
                and not dirName.startswith("\\\\")
            ):
                if dirName not in self.watcher.directories():
                    self.watcher.addPath(dirName)
                if dirName in self.watchedItems:
                    if itm not in self.watchedItems[dirName]:
                        self.watchedItems[dirName].append(itm)
                else:
                    self.watchedItems[dirName] = [itm]

    def _removeWatchedItem(self, itm):
        """
        Protected method to remove a watched item.

        @param itm item to be removed (BrowserDirectoryItem)
        """
        if isinstance(itm, BrowserDirectoryItem):
            dirName = itm.dirName()
            if dirName in self.watchedItems:
                if itm in self.watchedItems[dirName]:
                    self.watchedItems[dirName].remove(itm)
                if len(self.watchedItems[dirName]) == 0:
                    del self.watchedItems[dirName]
                    self.watcher.removePath(dirName)

    def directoryChanged(self, path):
        """
        Public slot to handle the directoryChanged signal of the watcher.

        @param path path of the directory (string)
        """
        if path not in self.watchedItems:
            # just ignore the situation we don't have a reference to the item
            return

        dirFilter = (
            QDir.Filter.AllEntries | QDir.Filter.NoDotAndDotDot | QDir.Filter.Hidden
        )

        for itm in self.watchedItems[path]:
            oldCnt = itm.childCount()

            qdir = QDir(itm.dirName())

            entryInfoList = qdir.entryInfoList(dirFilter)

            # step 1: check for new entries
            children = itm.children()
            for f in entryInfoList:
                fpath = Utilities.toNativeSeparators(f.absoluteFilePath())
                childFound = False
                for child in children:
                    if child.name() == fpath:
                        childFound = True
                        children.remove(child)
                        break
                if childFound:
                    continue

                cnt = itm.childCount()
                self.beginInsertRows(self.createIndex(itm.row(), 0, itm), cnt, cnt)
                node = (
                    BrowserDirectoryItem(
                        itm, Utilities.toNativeSeparators(f.absoluteFilePath()), False
                    )
                    if f.isDir()
                    else BrowserFileItem(
                        itm, Utilities.toNativeSeparators(f.absoluteFilePath())
                    )
                )
                self._addItem(node, itm)
                self.endInsertRows()

            # step 2: check for removed entries
            if len(entryInfoList) != itm.childCount():
                for row in range(oldCnt - 1, -1, -1):
                    child = itm.child(row)
                    childname = Utilities.fromNativeSeparators(child.name())
                    entryFound = False
                    for f in entryInfoList:
                        if f.absoluteFilePath() == childname:
                            entryFound = True
                            entryInfoList.remove(f)
                            break
                    if entryFound:
                        continue

                    self._removeWatchedItem(child)
                    self.beginRemoveRows(self.createIndex(itm.row(), 0, itm), row, row)
                    itm.removeChild(child)
                    self.endRemoveRows()

    def __populateModel(self):
        """
        Private method to populate the browser model.
        """
        self.toplevelDirs = []
        tdp = Preferences.getSettings().value("BrowserModel/ToplevelDirs")
        if tdp:
            self.toplevelDirs = tdp
        else:
            self.toplevelDirs.append(Utilities.toNativeSeparators(QDir.homePath()))
            for d in QDir.drives():
                self.toplevelDirs.append(
                    Utilities.toNativeSeparators(d.absoluteFilePath())
                )

        for d in self.toplevelDirs:
            itm = BrowserDirectoryItem(self.rootItem, d)
            self._addItem(itm, self.rootItem)

    def interpreterChanged(self, interpreter):
        """
        Public method to handle a change of the debug client's interpreter.

        @param interpreter interpreter of the debug client (string)
        """
        if interpreter and "python" in interpreter.lower():
            if interpreter.endswith("w.exe"):
                interpreter = interpreter.replace("w.exe", ".exe")
            if self.__sysPathInterpreter != interpreter:
                self.__sysPathInterpreter = interpreter
                # step 1: remove sys.path entry
                if self.__sysPathItem is not None:
                    self.beginRemoveRows(
                        QModelIndex(),
                        self.__sysPathItem.row(),
                        self.__sysPathItem.row(),
                    )
                    self.rootItem.removeChild(self.__sysPathItem)
                    self.endRemoveRows()
                    self.__sysPathItem = None

                if self.__sysPathInterpreter:
                    # step 2: add a new one
                    self.__sysPathItem = BrowserSysPathItem(self.rootItem)
                    self.addItem(self.__sysPathItem)
        else:
            # remove sys.path entry
            if self.__sysPathItem is not None:
                self.beginRemoveRows(
                    QModelIndex(), self.__sysPathItem.row(), self.__sysPathItem.row()
                )
                self.rootItem.removeChild(self.__sysPathItem)
                self.endRemoveRows()
                self.__sysPathItem = None
            self.__sysPathInterpreter = ""

    def programChange(self, dirname):
        """
        Public method to change the entry for the directory of file being
        debugged.

        @param dirname name of the directory containing the file (string)
        """
        if self.progDir:
            if dirname == self.progDir.dirName():
                return

            # remove old entry
            self._removeWatchedItem(self.progDir)
            self.beginRemoveRows(QModelIndex(), self.progDir.row(), self.progDir.row())
            self.rootItem.removeChild(self.progDir)
            self.endRemoveRows()
            self.progDir = None

        itm = BrowserDirectoryItem(self.rootItem, dirname)
        self.addItem(itm)
        self.progDir = itm

    def addTopLevelDir(self, dirname):
        """
        Public method to add a new toplevel directory.

        @param dirname name of the new toplevel directory (string)
        """
        if dirname not in self.toplevelDirs:
            itm = BrowserDirectoryItem(self.rootItem, dirname)
            self.addItem(itm)
            self.toplevelDirs.append(itm.dirName())

    def removeToplevelDir(self, index):
        """
        Public method to remove a toplevel directory.

        @param index index of the toplevel directory to be removed
            (QModelIndex)
        """
        if not index.isValid():
            return

        item = index.internalPointer()
        self.beginRemoveRows(index.parent(), index.row(), index.row())
        self.rootItem.removeChild(item)
        self.endRemoveRows()

        self.toplevelDirs.remove(item.dirName())
        self._removeWatchedItem(item)

    def saveToplevelDirs(self):
        """
        Public slot to save the toplevel directories.
        """
        Preferences.getSettings().setValue(
            "BrowserModel/ToplevelDirs", self.toplevelDirs
        )

    def _addItem(self, itm, parentItem):
        """
        Protected slot to add an item.

        @param itm reference to item to add (BrowserItem)
        @param parentItem reference to item to add to (BrowserItem)
        """
        parentItem.appendChild(itm)

    def addItem(self, itm, parent=None):
        """
        Public slot to add an item.

        @param itm item to add (BrowserItem)
        @param parent index of parent item (QModelIndex)
        """
        if parent is None:
            parent = QModelIndex()

        parentItem = parent.internalPointer() if parent.isValid() else self.rootItem

        cnt = parentItem.childCount()
        self.beginInsertRows(parent, cnt, cnt)
        self._addItem(itm, parentItem)
        self.endInsertRows()

    def populateItem(self, parentItem, repopulate=False):
        """
        Public method to populate an item's subtree.

        @param parentItem reference to the item to be populated
        @param repopulate flag indicating a repopulation (boolean)
        """
        if parentItem.type() == BrowserItemDirectory:
            self.populateDirectoryItem(parentItem, repopulate)
        elif parentItem.type() == BrowserItemSysPath:
            self.populateSysPathItem(parentItem, repopulate)
        elif parentItem.type() == BrowserItemFile:
            self.populateFileItem(parentItem, repopulate)
        elif parentItem.type() == BrowserItemClass:
            self.populateClassItem(parentItem, repopulate)
        elif parentItem.type() == BrowserItemMethod:
            self.populateMethodItem(parentItem, repopulate)
        elif parentItem.type() == BrowserItemAttributes:
            self.populateClassAttributesItem(parentItem, repopulate)

    def populateDirectoryItem(self, parentItem, repopulate=False):
        """
        Public method to populate a directory item's subtree.

        @param parentItem reference to the directory item to be populated
        @param repopulate flag indicating a repopulation (boolean)
        """
        self._addWatchedItem(parentItem)

        qdir = QDir(parentItem.dirName())

        dirFilter = (
            QDir.Filter.AllEntries | QDir.Filter.NoDotAndDotDot | QDir.Filter.Hidden
        )
        entryInfoList = qdir.entryInfoList(dirFilter)
        if len(entryInfoList) > 0:
            if repopulate:
                self.beginInsertRows(
                    self.createIndex(parentItem.row(), 0, parentItem),
                    0,
                    len(entryInfoList) - 1,
                )
            for f in entryInfoList:
                if f.isDir():
                    node = BrowserDirectoryItem(
                        parentItem,
                        Utilities.toNativeSeparators(f.absoluteFilePath()),
                        False,
                    )
                else:
                    fileFilters = Preferences.getUI("BrowsersFileFilters").split(";")
                    if fileFilters:
                        fn = f.fileName()
                        if any(fnmatch.fnmatch(fn, ff.strip()) for ff in fileFilters):
                            continue
                    node = BrowserFileItem(
                        parentItem, Utilities.toNativeSeparators(f.absoluteFilePath())
                    )
                self._addItem(node, parentItem)
            if repopulate:
                self.endInsertRows()

    def populateSysPathItem(self, parentItem, repopulate=False):
        """
        Public method to populate a sys.path item's subtree.

        @param parentItem reference to the sys.path item to be populated
        @param repopulate flag indicating a repopulation (boolean)
        """
        if self.__sysPathInterpreter:
            script = "import sys, json; print(json.dumps(sys.path))"
            proc = QProcess()
            proc.start(self.__sysPathInterpreter, ["-c", script])
            finished = proc.waitForFinished(3000)
            if finished:
                procOutput = str(
                    proc.readAllStandardOutput(),
                    Preferences.getSystem("IOEncoding"),
                    "replace",
                )
                syspath = [p for p in json.loads(procOutput) if p]
                if len(syspath) > 0:
                    if repopulate:
                        self.beginInsertRows(
                            self.createIndex(parentItem.row(), 0, parentItem),
                            0,
                            len(syspath) - 1,
                        )
                    for p in syspath:
                        node = (
                            BrowserDirectoryItem(parentItem, p)
                            if os.path.isdir(p)
                            else BrowserFileItem(parentItem, p)
                        )
                        self._addItem(node, parentItem)
                    if repopulate:
                        self.endInsertRows()
            else:
                proc.kill()

    def populateFileItem(self, parentItem, repopulate=False):
        """
        Public method to populate a file item's subtree.

        @param parentItem reference to the file item to be populated
        @param repopulate flag indicating a repopulation (boolean)
        """
        from eric7.Utilities import ClassBrowsers

        moduleName = parentItem.moduleName()
        fileName = parentItem.fileName()
        try:
            dictionary = ClassBrowsers.readmodule(
                moduleName,
                [parentItem.dirName()],
                parentItem.isPython3File() or parentItem.isCythonFile(),
            )
        except ImportError:
            return

        keys = list(dictionary.keys())
        if len(keys) > 0:
            if repopulate:
                last = len(keys) - 1
                if "@@Coding@@" in keys and not Preferences.getUI("BrowserShowCoding"):
                    last -= 1
                self.beginInsertRows(
                    self.createIndex(parentItem.row(), 0, parentItem), 0, last
                )

            for key in keys:
                if key.startswith("@@"):
                    # special treatment done later
                    continue
                cl = dictionary[key]
                with contextlib.suppress(AttributeError):
                    if cl.module == moduleName:
                        node = BrowserClassItem(parentItem, cl, fileName)
                        self._addItem(node, parentItem)
            if "@@Coding@@" in keys and Preferences.getUI("BrowserShowCoding"):
                node = BrowserCodingItem(
                    parentItem,
                    QCoreApplication.translate("BrowserModel", "Coding: {0}").format(
                        dictionary["@@Coding@@"].coding
                    ),
                    dictionary["@@Coding@@"].linenumber,
                )
                self._addItem(node, parentItem)
            if "@@Globals@@" in keys:
                node = BrowserGlobalsItem(
                    parentItem,
                    dictionary["@@Globals@@"].globals,
                    QCoreApplication.translate("BrowserModel", "Globals"),
                )
                self._addItem(node, parentItem)
            if "@@Import@@" in keys or "@@ImportFrom@@" in keys:
                node = BrowserImportsItem(
                    parentItem, QCoreApplication.translate("BrowserModel", "Imports")
                )
                self._addItem(node, parentItem)
                if "@@Import@@" in keys:
                    for importedModule in (
                        dictionary["@@Import@@"].getImports().values()
                    ):
                        m_node = BrowserImportItem(
                            node,
                            importedModule.importedModuleName,
                            importedModule.file,
                            importedModule.linenos,
                        )
                        self._addItem(m_node, node)
                        for (
                            importedName,
                            linenos,
                        ) in importedModule.importedNames.items():
                            mn_node = BrowserImportItem(
                                m_node,
                                importedName,
                                importedModule.file,
                                linenos,
                                isModule=False,
                            )
                            self._addItem(mn_node, m_node)

            if repopulate:
                self.endInsertRows()

        parentItem._populated = True
        if (
            parentItem.type_ == BrowserItemFile
            and fileName not in self.watchedFileItems
        ):
            # watch the file only in the file browser not the project viewer
            self.watcher.addPath(fileName)
            self.watchedFileItems[fileName] = parentItem

    def repopulateFileItem(self, itm):
        """
        Public method to repopulate a file item.

        @param itm reference to the item to be repopulated
        @type BrowserFileItem
        """
        if isinstance(itm, BrowserFileItem) and itm.isLazyPopulated():
            if not itm.isPopulated():
                # item is not populated yet, nothing to do
                return

            if itm.childCount():
                index = self.createIndex(itm.row(), 0, itm)
                self.beginRemoveRows(index, 0, itm.childCount() - 1)
                itm.removeChildren()
                self.endRemoveRows()

            self.populateFileItem(itm, True)

    def fileChanged(self, fileName):
        """
        Public method to react upon file changes.

        @param fileName path of the changed file
        @type str
        """
        if fileName in self.watchedFileItems:
            if os.path.exists(fileName):
                # the file was changed
                self.repopulateFileItem(self.watchedFileItems[fileName])
            else:
                # the file does not exist anymore
                del self.watchedFileItems[fileName]

    def populateClassItem(self, parentItem, repopulate=False):
        """
        Public method to populate a class item's subtree.

        @param parentItem reference to the class item to be populated
        @param repopulate flag indicating a repopulation (boolean)
        """
        cl = parentItem.classObject()
        file_ = parentItem.fileName()

        if cl is None:
            return

        # build sorted list of names
        keys = []
        for name in list(cl.classes.keys()):
            keys.append((name, "c"))
        for name in list(cl.methods.keys()):
            keys.append((name, "m"))

        if len(cl.attributes):
            node = BrowserClassAttributesItem(
                parentItem,
                cl.attributes,
                QCoreApplication.translate("BrowserModel", "Attributes"),
            )
            if repopulate:
                self.addItem(node, self.createIndex(parentItem.row(), 0, parentItem))
            else:
                self._addItem(node, parentItem)

        if len(cl.globals):
            node = BrowserClassAttributesItem(
                parentItem,
                cl.globals,
                QCoreApplication.translate("BrowserModel", "Class Attributes"),
                True,
            )
            if repopulate:
                self.addItem(node, self.createIndex(parentItem.row(), 0, parentItem))
            else:
                self._addItem(node, parentItem)

        if len(keys) > 0:
            if repopulate:
                self.beginInsertRows(
                    self.createIndex(parentItem.row(), 0, parentItem), 0, len(keys) - 1
                )
            for key, kind in keys:
                if kind == "c":
                    node = BrowserClassItem(parentItem, cl.classes[key], file_)
                elif kind == "m":
                    node = BrowserMethodItem(parentItem, cl.methods[key], file_)
                self._addItem(node, parentItem)
            if repopulate:
                self.endInsertRows()

    def populateMethodItem(self, parentItem, repopulate=False):
        """
        Public method to populate a method item's subtree.

        @param parentItem reference to the method item to be populated
        @param repopulate flag indicating a repopulation (boolean)
        """
        fn = parentItem.functionObject()
        file_ = parentItem.fileName()

        if fn is None:
            return

        # build sorted list of names
        keys = []
        for name in list(fn.classes.keys()):
            keys.append((name, "c"))
        for name in list(fn.methods.keys()):
            keys.append((name, "m"))

        if len(keys) > 0:
            if repopulate:
                self.beginInsertRows(
                    self.createIndex(parentItem.row(), 0, parentItem), 0, len(keys) - 1
                )
            for key, kind in keys:
                if kind == "c":
                    node = BrowserClassItem(parentItem, fn.classes[key], file_)
                elif kind == "m":
                    node = BrowserMethodItem(parentItem, fn.methods[key], file_)
                self._addItem(node, parentItem)
            if repopulate:
                self.endInsertRows()

    def populateClassAttributesItem(self, parentItem, repopulate=False):
        """
        Public method to populate a class attributes item's subtree.

        @param parentItem reference to the class attributes item to be
            populated
        @param repopulate flag indicating a repopulation (boolean)
        """
        classAttributes = parentItem.isClassAttributes()
        attributes = parentItem.attributes()
        if not attributes:
            return

        keys = list(attributes.keys())
        if len(keys) > 0:
            if repopulate:
                self.beginInsertRows(
                    self.createIndex(parentItem.row(), 0, parentItem), 0, len(keys) - 1
                )
            for key in keys:
                node = BrowserClassAttributeItem(
                    parentItem, attributes[key], classAttributes
                )
                self._addItem(node, parentItem)
            if repopulate:
                self.endInsertRows()


class BrowserItem:
    """
    Class implementing the data structure for browser items.
    """

    def __init__(self, parent, data):
        """
        Constructor

        @param parent reference to the parent item
        @param data single data of the item
        """
        self.childItems = []

        self.parentItem = parent
        self.itemData = [data]
        self.type_ = BrowserItemRoot
        self.icon = EricPixmapCache.getIcon("empty")
        self._populated = True
        self._lazyPopulation = False
        self.symlink = False

    def appendChild(self, child):
        """
        Public method to add a child to this item.

        @param child reference to the child item to add (BrowserItem)
        """
        self.childItems.append(child)
        self._populated = True

    def removeChild(self, child):
        """
        Public method to remove a child.

        @param child reference to the child to remove (BrowserItem)
        """
        self.childItems.remove(child)

    def removeChildren(self):
        """
        Public method to remove all children.
        """
        self.childItems = []

    def child(self, row):
        """
        Public method to get a child id.

        @param row number of child to get the id of (integer)
        @return reference to the child item (BrowserItem)
        """
        return self.childItems[row]

    def children(self):
        """
        Public method to get the ids of all child items.

        @return references to all child items (list of BrowserItem)
        """
        return self.childItems[:]

    def childCount(self):
        """
        Public method to get the number of available child items.

        @return number of child items (integer)
        """
        return len(self.childItems)

    def columnCount(self):
        """
        Public method to get the number of available data items.

        @return number of data items (integer)
        """
        return len(self.itemData)

    def data(self, column):
        """
        Public method to get a specific data item.

        @param column number of the requested data item (integer)
        @return stored data item
        """
        try:
            return self.itemData[column]
        except IndexError:
            return ""

    def parent(self):
        """
        Public method to get the reference to the parent item.

        @return reference to the parent item
        """
        return self.parentItem

    def row(self):
        """
        Public method to get the row number of this item.

        @return row number (integer)
        """
        try:
            return self.parentItem.childItems.index(self)
        except ValueError:
            return 0

    def type(self):
        """
        Public method to get the item type.

        @return type of the item
        """
        return self.type_

    def isPublic(self):
        """
        Public method returning the public visibility status.

        @return flag indicating public visibility (boolean)
        """
        return True

    def getIcon(self):
        """
        Public method to get the items icon.

        @return the icon (QIcon)
        """
        return self.icon

    def isPopulated(self):
        """
        Public method to chek, if this item is populated.

        @return population status (boolean)
        """
        return self._populated

    def isLazyPopulated(self):
        """
        Public method to check, if this item should be populated lazyly.

        @return lazy population flag (boolean)
        """
        return self._lazyPopulation

    def lessThan(self, other, column, order):
        """
        Public method to check, if the item is less than the other one.

        @param other reference to item to compare against (BrowserItem)
        @param column column number to use for the comparison (integer)
        @param order sort order (Qt.SortOrder) (for special sorting)
        @return true, if this item is less than other (boolean)
        """
        try:
            return self.itemData[column] < other.itemData[column]
        except IndexError:
            return False

    def isSymlink(self):
        """
        Public method to check, if the items is a symbolic link.

        @return flag indicating a symbolic link (boolean)
        """
        return self.symlink


class BrowserDirectoryItem(BrowserItem):
    """
    Class implementing the data structure for browser directory items.
    """

    def __init__(self, parent, dinfo, full=True):
        """
        Constructor

        @param parent parent item
        @param dinfo dinfo is the string for the directory (string)
        @param full flag indicating full pathname should be displayed (boolean)
        """
        self._dirName = os.path.abspath(dinfo)
        dn = self._dirName if full else os.path.basename(self._dirName)
        BrowserItem.__init__(self, parent, dn)

        self.type_ = BrowserItemDirectory
        if (
            not Utilities.isDrive(self._dirName)
            and os.path.lexists(self._dirName)
            and os.path.islink(self._dirName)
        ):
            self.symlink = True
            self.icon = EricPixmapCache.getSymlinkIcon("dirClosed")
        else:
            self.icon = EricPixmapCache.getIcon("dirClosed")
        self._populated = False
        self._lazyPopulation = True

    def setName(self, dinfo, full=True):
        """
        Public method to set the directory name.

        @param dinfo dinfo is the string for the directory (string)
        @param full flag indicating full pathname should be displayed (boolean)
        """
        self._dirName = os.path.abspath(dinfo)
        dn = self._dirName if full else os.path.basename(self._dirName)
        self.itemData[0] = dn

    def dirName(self):
        """
        Public method returning the directory name.

        @return directory name (string)
        """
        return self._dirName

    def name(self):
        """
        Public method to return the name of the item.

        @return name of the item (string)
        """
        return self._dirName

    def lessThan(self, other, column, order):
        """
        Public method to check, if the item is less than the other one.

        @param other reference to item to compare against (BrowserItem)
        @param column column number to use for the comparison (integer)
        @param order sort order (Qt.SortOrder) (for special sorting)
        @return true, if this item is less than other (boolean)
        """
        if issubclass(other.__class__, BrowserFileItem) and Preferences.getUI(
            "BrowsersListFoldersFirst"
        ):
            return order == Qt.SortOrder.AscendingOrder

        return BrowserItem.lessThan(self, other, column, order)


class BrowserSysPathItem(BrowserItem):
    """
    Class implementing the data structure for browser sys.path items.
    """

    def __init__(self, parent):
        """
        Constructor

        @param parent parent item
        """
        BrowserItem.__init__(self, parent, "sys.path")

        self.type_ = BrowserItemSysPath
        self.icon = EricPixmapCache.getIcon("filePython")
        self._populated = False
        self._lazyPopulation = True

    def name(self):
        """
        Public method to return the name of the item.

        @return name of the item (string)
        """
        return "sys.path"


class BrowserFileItem(BrowserItem):
    """
    Class implementing the data structure for browser file items.
    """

    def __init__(self, parent, finfo, full=True, sourceLanguage=""):
        """
        Constructor

        @param parent parent item
        @param finfo the string for the file (string)
        @param full flag indicating full pathname should be displayed (boolean)
        @param sourceLanguage source code language of the project (string)
        """
        BrowserItem.__init__(self, parent, os.path.basename(finfo))

        self.type_ = BrowserItemFile
        self.fileext = os.path.splitext(finfo)[1].lower()
        self._filename = os.path.abspath(finfo)
        self._dirName = os.path.dirname(finfo)
        self.sourceLanguage = sourceLanguage

        self._moduleName = ""

        pixName = ""
        if self.isPython3File():
            pixName = "filePython"
            self._populated = False
            self._lazyPopulation = True
            self._moduleName = os.path.basename(finfo)
        elif self.isCythonFile():
            pixName = "lexerCython"
            self._populated = False
            self._lazyPopulation = True
            self._moduleName = os.path.basename(finfo)
        elif self.isRubyFile():
            pixName = "fileRuby"
            self._populated = False
            self._lazyPopulation = True
            self._moduleName = os.path.basename(finfo)
        elif self.isDesignerFile():
            pixName = "fileDesigner"
        elif self.isLinguistFile():
            if self.fileext == ".ts":
                pixName = "fileLinguist"
            else:
                pixName = "fileLinguist2"
        elif self.isResourcesFile():
            pixName = "fileResource"
        elif self.isProjectFile():
            pixName = "fileProject"
        elif self.isMultiProjectFile():
            pixName = "fileMultiProject"
        elif self.isSvgFile():
            pixName = "fileSvg"
        elif self.isPixmapFile():
            pixName = "filePixmap"
        elif self.isDFile():
            pixName = "fileD"
        elif self.isJavaScriptFile():
            pixName = "fileJavascript"
            self._populated = False
            self._lazyPopulation = True
            self._moduleName = os.path.basename(finfo)
        elif self.isEricGraphicsFile():
            pixName = "fileUML"
        elif self.isParsableFile():
            pixName = ClassBrowsers.getIcon(self._filename)
            self._populated = False
            self._lazyPopulation = True
            self._moduleName = os.path.basename(finfo)
        else:
            pixName = "fileMisc"

        if os.path.lexists(self._filename) and os.path.islink(self._filename):
            self.symlink = True
            self.icon = EricPixmapCache.getSymlinkIcon(pixName)
        else:
            self.icon = EricPixmapCache.getIcon(pixName)

    def setName(self, finfo, full=True):
        """
        Public method to set the directory name.

        @param finfo the string for the file (string)
        @param full flag indicating full pathname should be displayed (boolean)
        """
        self._filename = os.path.abspath(finfo)
        self.itemData[0] = os.path.basename(finfo)
        self.fileext = os.path.splitext(finfo)[1].lower()
        if self.isPython3File() or self.isRubyFile() or self.isParsableFile():
            self._dirName = os.path.dirname(finfo)
            self._moduleName = os.path.basename(finfo)

    def fileName(self):
        """
        Public method returning the filename.

        @return filename (string)
        """
        return self._filename

    def name(self):
        """
        Public method to return the name of the item.

        @return name of the item (string)
        """
        return self._filename

    def fileExt(self):
        """
        Public method returning the file extension.

        @return file extension (string)
        """
        return self.fileext

    def dirName(self):
        """
        Public method returning the directory name.

        @return directory name (string)
        """
        return self._dirName

    def moduleName(self):
        """
        Public method returning the module name.

        @return module name (string)
        """
        return self._moduleName

    def isPython3File(self):
        """
        Public method to check, if this file is a Python3 script.

        @return flag indicating a Python3 file
        @rtype bool
        """
        return (
            self.fileext in Preferences.getPython("Python3Extensions")
            or (self.fileext == "" and self.sourceLanguage == "Python3")
            or (
                not Preferences.getPython("Python3Extensions")
                and self.fileext in (".py", ".pyw")
            )
        )

    def isCythonFile(self):
        """
        Public method to check, if this file is a Cython file.

        @return flag indicating a Cython file
        @rtype bool
        """
        return self.fileext in (".pyx", ".pxd", ".pxi") or (
            self.fileext == "" and self.sourceLanguage == "Cython"
        )

    def isRubyFile(self):
        """
        Public method to check, if this file is a Ruby script.

        @return flag indicating a Ruby file
        @rtype bool
        """
        return self.fileext == ".rb" or (
            self.fileext == "" and self.sourceLanguage == "Ruby"
        )

    def isDesignerFile(self):
        """
        Public method to check, if this file is a Qt-Designer file.

        @return flag indicating a Qt-Designer file
        @rtype bool
        """
        return self.fileext == ".ui"

    def isLinguistFile(self):
        """
        Public method to check, if this file is a Qt-Linguist file.

        @return flag indicating a Qt-Linguist file
        @rtype bool
        """
        return self.fileext in [".ts", ".qm"]

    def isResourcesFile(self):
        """
        Public method to check, if this file is a Qt-Resources file.

        @return flag indicating a Qt-Resources file
        @rtype bool
        """
        return self.fileext == ".qrc"

    def isProjectFile(self):
        """
        Public method to check, if this file is an eric project file.

        @return flag indicating an eric project file
        @rtype bool
        """
        return self.fileext in (".epj", ".e4p")

    def isMultiProjectFile(self):
        """
        Public method to check, if this file is an eric multi project file.

        @return flag indicating an eric project file
        @rtype bool
        """
        return self.fileext in (".emj", ".e4m", ".e5m")

    def isJavaScriptFile(self):
        """
        Public method to check, if this file is a JavaScript file.

        @return flag indicating a JavaScript file
        @rtype bool
        """
        return self.fileext == ".js"

    def isPixmapFile(self):
        """
        Public method to check, if this file is a pixmap file.

        @return flag indicating a pixmap file
        @rtype bool
        """
        return self.fileext[1:] in QImageReader.supportedImageFormats()

    def isSvgFile(self):
        """
        Public method to check, if this file is a SVG file.

        @return flag indicating a SVG file
        @rtype bool
        """
        return self.fileext == ".svg"

    def isDFile(self):
        """
        Public method to check, if this file is a D file.

        @return flag indicating a D file (boolean)
        """
        return self.fileext in [".d", ".di"] or (
            self.fileext == "" and self.sourceLanguage == "D"
        )

    def isEricGraphicsFile(self):
        """
        Public method to check, if this is an eric graphics file.

        @return flag indicating an eric graphics file
        @rtype bool
        """
        return self.fileext in (".egj", ".e5g")

    def isParsableFile(self):
        """
        Public method to check, if the file is supported by class browsers.

        @return flag indicating a supported file
        @rtype bool
        """
        return ClassBrowsers.isSupportedType(self.fileext)

    def lessThan(self, other, column, order):
        """
        Public method to check, if the item is less than the other one.

        @param other reference to item to compare against (BrowserItem)
        @param column column number to use for the comparison (integer)
        @param order sort order (Qt.SortOrder) (for special sorting)
        @return true, if this item is less than other (boolean)
        """
        if not issubclass(other.__class__, BrowserFileItem) and Preferences.getUI(
            "BrowsersListFoldersFirst"
        ):
            return order == Qt.SortOrder.DescendingOrder

        if issubclass(other.__class__, BrowserFileItem):
            sinit = os.path.basename(self._filename).startswith("__init__.py")
            oinit = os.path.basename(other.fileName()).startswith("__init__.py")
            if sinit and not oinit:
                return order == Qt.SortOrder.AscendingOrder
            if not sinit and oinit:
                return order == Qt.SortOrder.DescendingOrder

        return BrowserItem.lessThan(self, other, column, order)


class BrowserClassItem(BrowserItem):
    """
    Class implementing the data structure for browser class items.
    """

    def __init__(self, parent, cl, filename):
        """
        Constructor

        @param parent parent item
        @param cl Class object to be shown
        @param filename filename of the file defining this class
        """
        name = cl.name
        if hasattr(cl, "super") and cl.super:
            supers = []
            for sup in cl.super:
                try:
                    sname = sup.name
                    if sup.module != cl.module:
                        sname = "{0}.{1}".format(sup.module, sname)
                except AttributeError:
                    sname = sup
                supers.append(sname)
            name += "({0})".format(", ".join(supers))

        BrowserItem.__init__(self, parent, name)

        self.type_ = BrowserItemClass
        self._name = name
        self._classObject = cl
        self._filename = filename

        self.isfunction = isinstance(self._classObject, ClbrBaseClasses.Function)
        self.ismodule = isinstance(self._classObject, ClbrBaseClasses.Module)
        self.isenum = isinstance(self._classObject, ClbrBaseClasses.Enum)
        if self.isfunction:
            if cl.isPrivate():
                self.icon = EricPixmapCache.getIcon("method_private")
            elif cl.isProtected():
                self.icon = EricPixmapCache.getIcon("method_protected")
            else:
                self.icon = EricPixmapCache.getIcon("method")
            self.itemData[0] = "{0}({1})".format(
                name, ", ".join(self._classObject.parameters)
            )
            if self._classObject.annotation:
                self.itemData[0] = "{0} {1}".format(
                    self.itemData[0], self._classObject.annotation
                )
            # - if no defaults are wanted
            # - ....format(name,
            # -            ", ".join([e.split('=')[0].strip()
            # -                       for e in self._classObject.parameters]))
        elif self.ismodule:
            self.icon = EricPixmapCache.getIcon("module")
        elif self.isenum:
            self.icon = EricPixmapCache.getIcon("attribute")
        else:
            if cl.isPrivate():
                self.icon = EricPixmapCache.getIcon("class_private")
            elif cl.isProtected():
                self.icon = EricPixmapCache.getIcon("class_protected")
            else:
                self.icon = EricPixmapCache.getIcon("class")
        if self._classObject and (
            self._classObject.methods
            or self._classObject.classes
            or self._classObject.attributes
            or self._classObject.globals
        ):
            self._populated = False
            self._lazyPopulation = True

    def name(self):
        """
        Public method to return the name of the item.

        @return name of the item (string)
        """
        return "{0}@@{1}".format(self._filename, self.lineno())

    def fileName(self):
        """
        Public method returning the filename.

        @return filename (string)
        """
        return self._filename

    def classObject(self):
        """
        Public method returning the class object.

        @return reference to the class object
        """
        return self._classObject

    def lineno(self):
        """
        Public method returning the line number defining this object.

        @return line number defining the object (integer)
        """
        return self._classObject.lineno

    def boundaries(self):
        """
        Public method returning the boundaries of the method definition.

        @return tuple with start end end line number (integer, integer)
        """
        return (self._classObject.lineno, self._classObject.endlineno)

    def lessThan(self, other, column, order):
        """
        Public method to check, if the item is less than the other one.

        @param other reference to item to compare against (BrowserItem)
        @param column column number to use for the comparison (integer)
        @param order sort order (Qt.SortOrder) (for special sorting)
        @return true, if this item is less than other (boolean)
        """
        if issubclass(other.__class__, (BrowserCodingItem, BrowserClassAttributesItem)):
            return order == Qt.SortOrder.DescendingOrder

        if Preferences.getUI("BrowsersListContentsByOccurrence") and column == 0:
            if order == Qt.SortOrder.AscendingOrder:
                return self.lineno() < other.lineno()
            else:
                return self.lineno() > other.lineno()

        return BrowserItem.lessThan(self, other, column, order)

    def isPublic(self):
        """
        Public method returning the public visibility status.

        @return flag indicating public visibility (boolean)
        """
        return self._classObject.isPublic()


class BrowserMethodItem(BrowserItem):
    """
    Class implementing the data structure for browser method items.
    """

    def __init__(self, parent, fn, filename):
        """
        Constructor

        @param parent parent item
        @param fn Function object to be shown
        @param filename filename of the file defining this class (string)
        """
        name = fn.name
        BrowserItem.__init__(self, parent, name)

        self.type_ = BrowserItemMethod
        self._name = name
        self._functionObject = fn
        self._filename = filename
        if self._functionObject.modifier == ClbrBaseClasses.Function.Static:
            self.icon = EricPixmapCache.getIcon("method_static")
        elif self._functionObject.modifier == ClbrBaseClasses.Function.Class:
            self.icon = EricPixmapCache.getIcon("method_class")
        elif self._functionObject.isPrivate():
            self.icon = EricPixmapCache.getIcon("method_private")
        elif self._functionObject.isProtected():
            self.icon = EricPixmapCache.getIcon("method_protected")
        else:
            self.icon = EricPixmapCache.getIcon("method")
        self.itemData[0] = "{0}({1})".format(
            name, ", ".join(self._functionObject.parameters)
        )
        if self._functionObject.annotation:
            self.itemData[0] = "{0} {1}".format(
                self.itemData[0], self._functionObject.annotation
            )
        # if no defaults are wanted
        # ....format(name,
        #            ", ".join([e.split('=')[0].strip()
        #                       for e in self._functionObject.parameters]))
        if self._functionObject and (
            self._functionObject.methods or self._functionObject.classes
        ):
            self._populated = False
            self._lazyPopulation = True

    def name(self):
        """
        Public method to return the name of the item.

        @return name of the item (string)
        """
        return "{0}@@{1}".format(self._filename, self.lineno())

    def fileName(self):
        """
        Public method returning the filename.

        @return filename (string)
        """
        return self._filename

    def functionObject(self):
        """
        Public method returning the function object.

        @return reference to the function object
        """
        return self._functionObject

    def lineno(self):
        """
        Public method returning the line number defining this object.

        @return line number defining the object (integer)
        """
        return self._functionObject.lineno

    def boundaries(self):
        """
        Public method returning the boundaries of the method definition.

        @return tuple with start end end line number (integer, integer)
        """
        return (self._functionObject.lineno, self._functionObject.endlineno)

    def lessThan(self, other, column, order):
        """
        Public method to check, if the item is less than the other one.

        @param other reference to item to compare against (BrowserItem)
        @param column column number to use for the comparison (integer)
        @param order sort order (Qt.SortOrder) (for special sorting)
        @return true, if this item is less than other (boolean)
        """
        if issubclass(other.__class__, BrowserMethodItem):
            if self._name.startswith("__init__"):
                return order == Qt.SortOrder.AscendingOrder
            if other._name.startswith("__init__"):
                return order == Qt.SortOrder.DescendingOrder
        elif issubclass(other.__class__, BrowserClassAttributesItem):
            return order == Qt.SortOrder.DescendingOrder

        if Preferences.getUI("BrowsersListContentsByOccurrence") and column == 0:
            if order == Qt.SortOrder.AscendingOrder:
                return self.lineno() < other.lineno()
            else:
                return self.lineno() > other.lineno()

        return BrowserItem.lessThan(self, other, column, order)

    def isPublic(self):
        """
        Public method returning the public visibility status.

        @return flag indicating public visibility (boolean)
        """
        return self._functionObject.isPublic()


class BrowserClassAttributesItem(BrowserItem):
    """
    Class implementing the data structure for browser class attributes items.
    """

    def __init__(self, parent, attributes, text, isClass=False):
        """
        Constructor

        @param parent parent item
        @param attributes list of attributes
        @param text text to be shown by this item (string)
        @param isClass flag indicating class attributes (boolean)
        """
        BrowserItem.__init__(self, parent, text)

        self.type_ = BrowserItemAttributes
        self._attributes = attributes.copy()
        self._populated = False
        self._lazyPopulation = True
        if isClass:
            self.icon = EricPixmapCache.getIcon("attributes_class")
        else:
            self.icon = EricPixmapCache.getIcon("attributes")
        self.__isClass = isClass

    def name(self):
        """
        Public method to return the name of the item.

        @return name of the item (string)
        """
        return "{0}@@{1}".format(self.parentItem.name(), self.data(0))

    def attributes(self):
        """
        Public method returning the attribute list.

        @return reference to the list of attributes
        """
        return self._attributes

    def isClassAttributes(self):
        """
        Public method returning the attributes type.

        @return flag indicating class attributes (boolean)
        """
        return self.__isClass

    def lessThan(self, other, column, order):
        """
        Public method to check, if the item is less than the other one.

        @param other reference to item to compare against (BrowserItem)
        @param column column number to use for the comparison (integer)
        @param order sort order (Qt.SortOrder) (for special sorting)
        @return true, if this item is less than other (boolean)
        """
        if issubclass(other.__class__, BrowserCodingItem):
            return order == Qt.SortOrder.DescendingOrder
        elif issubclass(other.__class__, (BrowserClassItem, BrowserMethodItem)):
            return order == Qt.SortOrder.AscendingOrder

        return BrowserItem.lessThan(self, other, column, order)


class BrowserClassAttributeItem(BrowserItem):
    """
    Class implementing the data structure for browser class attribute items.
    """

    def __init__(self, parent, attribute, isClass=False):
        """
        Constructor

        @param parent parent item
        @param attribute reference to the attribute object
        @param isClass flag indicating a class attribute (boolean)
        """
        BrowserItem.__init__(self, parent, attribute.name)

        self.type_ = BrowserItemAttribute
        self._attributeObject = attribute
        self.__public = attribute.isPublic()
        if isClass:
            self.icon = EricPixmapCache.getIcon("attribute_class")
        elif attribute.isPrivate():
            self.icon = EricPixmapCache.getIcon("attribute_private")
        elif attribute.isProtected():
            self.icon = EricPixmapCache.getIcon("attribute_protected")
        else:
            self.icon = EricPixmapCache.getIcon("attribute")

    def isPublic(self):
        """
        Public method returning the public visibility status.

        @return flag indicating public visibility (boolean)
        """
        return self.__public

    def attributeObject(self):
        """
        Public method returning the class object.

        @return reference to the class object
        """
        return self._attributeObject

    def fileName(self):
        """
        Public method returning the filename.

        @return filename (string)
        """
        return self._attributeObject.file

    def lineno(self):
        """
        Public method returning the line number defining this object.

        @return line number defining the object (integer)
        """
        return self._attributeObject.lineno

    def linenos(self):
        """
        Public method returning the line numbers this object is assigned to.

        @return line number the object is assigned to (list of integers)
        """
        return self._attributeObject.linenos[:]

    def lessThan(self, other, column, order):
        """
        Public method to check, if the item is less than the other one.

        @param other reference to item to compare against (BrowserItem)
        @param column column number to use for the comparison (integer)
        @param order sort order (Qt.SortOrder) (for special sorting)
        @return true, if this item is less than other (boolean)
        """
        if Preferences.getUI("BrowsersListContentsByOccurrence") and column == 0:
            if order == Qt.SortOrder.AscendingOrder:
                return self.lineno() < other.lineno()
            else:
                return self.lineno() > other.lineno()

        return BrowserItem.lessThan(self, other, column, order)


class BrowserGlobalsItem(BrowserClassAttributesItem):
    """
    Class implementing the data structure for browser globals items.
    """

    def __init__(self, parent, attributes, text):
        """
        Constructor

        @param parent parent item
        @param attributes list of attributes
        @param text text to be shown by this item (string)
        """
        BrowserClassAttributesItem.__init__(self, parent, attributes, text)


class BrowserCodingItem(BrowserItem):
    """
    Class implementing the data structure for browser coding items.
    """

    def __init__(self, parent, text, linenumber):
        """
        Constructor

        @param parent parent item
        @type BrowserItem
        @param text text to be shown by this item
        @type str
        @param linenumber line number of the coding line
        @type int
        """
        BrowserItem.__init__(self, parent, text)

        self.type_ = BrowserItemCoding
        self.icon = EricPixmapCache.getIcon("textencoding")

        self.__lineno = linenumber

    def lineno(self):
        """
        Public method returning the line number of the coding line.

        @return line number defining the coding line
        @rtype int
        """
        return self.__lineno

    def lessThan(self, other, column, order):
        """
        Public method to check, if the item is less than the other one.

        @param other reference to item to compare against (BrowserItem)
        @param column column number to use for the comparison (integer)
        @param order sort order (Qt.SortOrder) (for special sorting)
        @return true, if this item is less than other (boolean)
        """
        if issubclass(
            other.__class__,
            (BrowserClassItem, BrowserClassAttributesItem, BrowserImportItem),
        ):
            return order == Qt.SortOrder.AscendingOrder

        return BrowserItem.lessThan(self, other, column, order)


class BrowserImportsItem(BrowserItem):
    """
    Class implementing the data structure for browser import items.
    """

    def __init__(self, parent, text):
        """
        Constructor

        @param parent parent item
        @param text text to be shown by this item (string)
        """
        BrowserItem.__init__(self, parent, text)

        self.type_ = BrowserItemImports
        self.icon = EricPixmapCache.getIcon("imports")

    def lessThan(self, other, column, order):
        """
        Public method to check, if the item is less than the other one.

        @param other reference to item to compare against (BrowserItem)
        @param column column number to use for the comparison (integer)
        @param order sort order (Qt.SortOrder) (for special sorting)
        @return true, if this item is less than other (boolean)
        """
        if issubclass(other.__class__, (BrowserClassItem, BrowserClassAttributesItem)):
            return order == Qt.SortOrder.AscendingOrder

        return BrowserItem.lessThan(self, other, column, order)


class BrowserImportItem(BrowserItem):
    """
    Class implementing the data structure for browser imported module and
    imported names items.
    """

    def __init__(self, parent, text, filename, lineNumbers, isModule=True):
        """
        Constructor

        @param parent parent item
        @param text text to be shown by this item (string)
        @param filename name of the file (string)
        @param lineNumbers list of line numbers of the import statement
            (list of integer)
        @param isModule flag indicating a module item entry (boolean)
        """
        BrowserItem.__init__(self, parent, text)

        self.__filename = filename
        self.__linenos = lineNumbers[:]

        self.type_ = BrowserItemImport
        if isModule:
            self.icon = EricPixmapCache.getIcon("importedModule")
        else:
            self.icon = EricPixmapCache.getIcon("importedName")

    def fileName(self):
        """
        Public method returning the filename.

        @return filename (string)
        """
        return self.__filename

    def lineno(self):
        """
        Public method returning the line number of the first import.

        @return line number of the first import (integer)
        """
        return self.__linenos[0]

    def linenos(self):
        """
        Public method returning the line numbers of all imports.

        @return line numbers of all imports (list of integers)
        """
        return self.__linenos[:]

    def lessThan(self, other, column, order):
        """
        Public method to check, if the item is less than the other one.

        @param other reference to item to compare against (BrowserItem)
        @param column column number to use for the comparison (integer)
        @param order sort order (Qt.SortOrder) (for special sorting)
        @return true, if this item is less than other (boolean)
        """
        if Preferences.getUI("BrowsersListContentsByOccurrence") and column == 0:
            if order == Qt.SortOrder.AscendingOrder:
                return self.lineno() < other.lineno()
            else:
                return self.lineno() > other.lineno()

        return BrowserItem.lessThan(self, other, column, order)