asn1_value_editor.py 42.5 KB
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
    TASTE ASN.1 Value Editor
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    Main GUI widget

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    Copyright (c) 2012-2016 European Space Agency
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    Designed and implemented by Maxime Perrotin

    Contact: maxime.perrotin@esa.int

    License is LGPLv3 - Check the LICENSE file
"""
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__author__ = "Maxime Perrotin"
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__license__ = "LGPLv3"
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__version__ = "1.6.4"
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__url__ = "http://taste.tuxfamily.org"

import sys
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import logging
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try:
    from PySide import *
    from PySide.QtCore import *
    from PySide.QtGui import *
    from PySide.QtUiTools import *
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except ImportError as err:
    print 'Pyside not found (package python-pyside missing)...' + str(err)
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import vn

MIN_RANGE = Qt.UserRole + 1
MAX_RANGE = Qt.UserRole + 2
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CHOICE_LIST = Qt.UserRole + 1     # list of strings (enumerants)
INTMAP      = Qt.UserRole + 5     # for enum/choice: map string-numerical value
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PLOTTERS = Qt.UserRole + 4
ASN1TYPE = Qt.UserRole


class myTextEdit(QTextEdit):
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    ''' Customized text editor that contains a context menu for loading
    data from a file '''
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    def __init__(self, parent=None):
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        super(myTextEdit, self).__init__(parent)
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    def contextMenuEvent(self, event):
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        ''' When the context menu is open, add the Load from file action
        and open the menu '''
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        myMenu = self.createStandardContextMenu()
        myAction = 'Load data from file'
        myMenu.addAction(myAction)
        action = myMenu.exec_(event.globalPos())
        if action is not None and action.text() == myAction:
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            filename = QFileDialog.getOpenFileName(self,
                                                  "Load string from file",
                                                  ".",
                                                  "All (*)")[0]
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            if len(filename) == 0:
                return
            stringFile = QFile(filename)
            stringFile.open(QIODevice.ReadOnly)
            stringData = str(stringFile.readData(stringFile.size()))
            self.setText(stringData)
            stringFile.close()


class TreeDelegate(QStyledItemDelegate):
    '''Tree Delegate allows to define specific editors for each cell of the
tree view. This way, e.g. ASN.1 ENUMERATED values can be selected using a
combo box, while INTEGERS values can be set using a spin box.
Three functions have been redefined:
(1) createEditor, which  sets an editor to a cell, using the cell attributes
to learn about the ASN.1 basic type (stored in Qt.UserRole)
(2) SetEditorData, which is used at runtime to put the value in the given
editor when the user clicks on the cell
(3) SetModelData, which is called when the user is done with the editing: it
reads the value from the editor and place it back in the model '''
    seqof = Signal(QModelIndex, int, int)
    choice = Signal(QModelIndex, int, int)

    def __init__(self, oParent=None):
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        super(TreeDelegate, self).__init__(oParent)
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    def createEditor(self, parent, option, index):
        ''' Define the delegate (editor) to use for a given cell.
index.data() returns the actual value, and index.data(role) points to
some user data when role >= 32. 32 is Qt.UserRole. '''
        # Check the (user-defined) type associated with the cell
        asnType = index.data(ASN1TYPE)
        if asnType == 'INTEGER':
            editor = QSpinBox(parent)
            # Qt's int is 32-bits signed, so we may get overflows
            try:
                editor.setMinimum(index.data(MIN_RANGE))
            except OverflowError:
                editor.setMinimum(sys.maxint)
            try:
                editor.setMaximum(index.data(MAX_RANGE))
            except OverflowError:
                editor.setMaximum(sys.maxint)
        elif asnType == 'SEQOF':
            editor = QSpinBox(parent)
            minVal = index.data(MIN_RANGE)
            maxVal = index.data(MAX_RANGE)
            editor.setRange(minVal, maxVal)
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        elif asnType in ('ENUMERATED', 'CHOICE'):
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            editor = QComboBox(parent)
            enumVal = index.data(CHOICE_LIST)
            for val in enumVal:
                editor.addItem(val)
        elif asnType == 'REAL':
            editor = QDoubleSpinBox(parent)
            minVal = index.data(MIN_RANGE)
            maxVal = index.data(MAX_RANGE)
            editor.setRange(float(minVal), float(maxVal))
        elif asnType == 'STRING':
            editor = myTextEdit(parent)
        elif asnType == 'BOOLEAN':
            editor = QComboBox(parent)
            boolVal = index.data(CHOICE_LIST)
            for val in boolVal:
                editor.addItem(val)
        else:
            return  # Non-editable cells
        return editor

    def setEditorData(self, editor, index):
        ''' Set the curent value of the editor (when cell is clicked)
            in principle, take it from the model (index.data() = value) '''
        asnType = index.data(ASN1TYPE)
        if asnType in ('INTEGER', 'SEQOF'):
            editor. setValue(int(index.data()))
        elif asnType in ('ENUMERATED', 'CHOICE'):
            idx = editor.findText(index.data())
            editor.setCurrentIndex(idx)
            #editor. setEditText(index.data())
        elif asnType == 'REAL':
            editor.setValue(float(index.data()))
        elif asnType == 'STRING':
            editor.setText(index.data())
        elif asnType == 'BOOLEAN':
            idx = editor.findText(index.data())
            editor.setCurrentIndex(idx)
            #isChecked = index.model().data(index,  Qt.CheckStateRole)
            #editor.setCheckState(Qt.CheckState(isChecked))
        else:
            pass

    def setModelData(self, editor, model, index):
        '''  Once a choice has been made (by the user) take the value from
             the corresponding editor, and set it back in the model '''
        asnType = index.data(ASN1TYPE)
        if asnType == 'INTEGER':
            val = editor.value()
            model.setData(index, val)
        elif asnType == 'SEQOF':
            val = editor.value()
            model.setData(index, val)
            # Sequence of: display only the corresponding number of elements
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            self.seqof.emit(index.sibling(index.row(), 0),
                            val,
                            index.data(MAX_RANGE))
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        elif asnType == 'ENUMERATED':
            val = editor.currentText()
            model.setData(index, val)
        elif asnType == 'CHOICE':
            val = editor.currentText()
            model.setData(index, val)
            # display only the corresponding choice definition
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            self.choice.emit(index.sibling(index.row(), 0),
                             len(index.data(CHOICE_LIST)),
                             editor.currentIndex())
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        elif asnType == 'REAL':
            val = editor.value()
            model.setData(index, val)
        elif asnType == 'STRING':
            val = editor.toPlainText()
            model.setData(index, val)
        elif asnType == 'BOOLEAN':
            val = editor.currentText()
            model.setData(index, val)
        else:
            pass

    def updateEditorGeometry(self, editor, option, index):
        ''' Set editor geometry (bigger box for string types) '''
        asnType = index.data(ASN1TYPE)
        if asnType == 'STRING':
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            r = QRect(option.rect.x(), option.rect.y(),
                      option.rect.width(), max(option.rect.height(), 100))
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        else:
            r = option.rect
        editor.setGeometry(r)


class asn1Editor(QTreeView):
    ''' ASN.1 Fields editor to define, load, save and/or send TC '''
    expandTree = Signal()
    expandBranch = Signal(QModelIndex)
    statusBarMessage = Signal(str)
    msc = Signal(unicode, unicode)
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    # Whenever a new TM is received, the new_tm signal is emitted
    new_tm = Signal()
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    # Use a signal to tell the plots (matplotlib) to update
    plot_refresh = Signal()
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    def __init__(self, parent=None):
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        super(asn1Editor, self).__init__(parent)
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        self.model = QStandardItemModel(1, 4)
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        self.model.setHorizontalHeaderLabels(['Field', 'Type',
                                              'Constraints', 'Value'])
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        self.delegate = TreeDelegate()
        self.setItemDelegate(self.delegate)
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        # Set selection mode and behavior to allow multiple rows to be selected
        # with Ctrl/Shift keys
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        self.setSelectionBehavior(QAbstractItemView.SelectRows)
        self.setSelectionMode(QAbstractItemView.ExtendedSelection)

        self.setModel(self.model)
        self.setAlternatingRowColors(True)
        # Set Editing triggers so that a single click in a cell opens the editor
        self.setEditTriggers(QAbstractItemView.AllEditTriggers)
        # If we later want to drag & drop values (to plot, meter..):
        self.setDragEnabled(False)
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        # When the number of elements for a sequence of is changed,
        # signal "seqof" is triggered by the delegate. Same for choice.
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        self.delegate.seqof.connect(self.seqofDisplay)
        self.delegate.choice.connect(self.choiceDisplay)
        self.expandTree.connect(self.expandAll)
        self.expandBranch.connect(self.expand)
        self.plotterBackend = None
        self.backend = None
        self.plottedIdxs = []
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        self.log = logging
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        self.pendingTM = False
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        # item is the ASN.1 node in Pyside format from datamodel.py
        self.item = None
        # List of classes that have an "update" method (user custom widgets)
        self.tm_clients = []
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        # Instance of the ASN.1 type to store the value of this editor
        self.asn1Instance = None

    def setBackend(self, backend):
        ''' Set the pointer to the TMTC backend generated by the B mapper '''
        self.backend = backend
        # Create an instance of the ASN.1 type using the backend
        self.asn1Instance = self.backend.typeInstance()
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    def hideExtraColumns(self):
        ''' Hide the columns containing the type and constraint '''
        self.setColumnHidden(1, True)
        self.setColumnHidden(2, True)

    def showExtraColumns(self):
        ''' Show the columns containing the type and constraint '''
        self.setColumnHidden(1, False)
        self.setColumnHidden(2, False)

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    def setAsn1Model(self, dataview, row=0):
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        self.item = dataview
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        rootItem = self.addItem(self.item)
        self.treeItem = rootItem["item"]
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        self.model.setItem(row, 1, QStandardItem(rootItem["type"]))
        self.model.setItem(row, 2, QStandardItem(rootItem["constraint"]))
        self.model.setItem(row, 3, QStandardItem(rootItem["value"]))
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        # Add the item to the actual tree. 0,0 = 1st row, 1st column
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        self.model.setItem(row, 0, self.treeItem)
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        self.setWindowTitle('ASN.1 Variable editor')
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        self.hideUnusedFields(self.treeItem, start=True, row=row)
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        self.setColumnWidth(0, 200)
        self.setColumnWidth(1, 150)
        self.expandAll()
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        return rootItem["item"]
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    def hideUnusedFields(self, root, start=False, row=0):
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        ''' Hide CHOICE unselected fields and SEQUENCE OF out-of-range fields '''
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        rootType = self.model.item(row, 1).text()
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        if rootType == 'CHOICE' and start:
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            choices = self.model.item(row, 3).data(CHOICE_LIST)
            currValue = self.model.item(row, 3).text()
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            for j in range(len(choices)):
                if currValue == choices[j]:
                    break
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            rowIndex = self.model.item(row).index()
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            self.choiceDisplay(rowIndex, len(choices), j)
        elif rootType == 'SEQOF' and start:
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            maxValue = self.model.item(row, 3).data(MAX_RANGE)
            currValue = self.model.item(row, 3).text()
            rowIndex = self.model.item(row).index()
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            self.seqofDisplay(rowIndex, currValue, maxValue)

        if root.hasChildren():
            for i in range(root.rowCount()):  # for each row
                self.hideUnusedFields(root.child(i))  # check recursively
                asnType = root.child(i, 1).text()
                if asnType == 'SEQOF':
                    maxValue = root.child(i, 3).data(MAX_RANGE)
                    currValue = root.child(i, 3).text()
                    rowIndex = root.child(i).index()
                    self.seqofDisplay(rowIndex, currValue, maxValue)
                elif asnType == 'CHOICE':
                    choices = root.child(i, 3).data(CHOICE_LIST)
                    currValue = root.child(i, 3).text()
                    for j in range(len(choices)):
                        if currValue == choices[j]:
                            break
                    rowIndex = root.child(i).index()
                    self.choiceDisplay(rowIndex, len(choices), j)

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    def parseModel(self, root, nbRows=-1, dest=None, choice=-1):
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        ''' Parse the model to get all field values recursively
            root type is QStandardItem
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            dest is a ctypes instance of the type to fill
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            choice >= 0 to specify a specific row to parse for a CHOICE
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        '''
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        if dest is None:
            self.log.error('parseModel: destination ASN.1 variable not set')

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        if root.hasChildren():
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            seqOf = True if nbRows != -1 else False
            if not seqOf:
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                nbRows = root.rowCount()
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            def parseRow(root, i, dest, seqOf=False):
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                name    = root.child(i, 0).text().replace('-', '_')
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                asnType = root.child(i, 1).text()
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                value   = root.child(i, 3).text()
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                ptr = getattr(dest, name) if not seqOf else dest
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                if seqOf:
                    ptr = ptr[i]
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                if asnType in ('SEQUENCE', 'SET'):
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                    if root.child(i).hasChildren():
                        # Discard empty sequence
                        self.parseModel(root.child(i), dest=ptr)
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                elif asnType == 'SEQOF':
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                    state = ptr.GetState()
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                    self.parseModel(root.child(i), nbRows=int(value), dest=ptr)
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                    ptr.SetLength(int(value))
                    ptr.Reset(state)
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                elif asnType == 'CHOICE':
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                    state = ptr.GetState()
                    # We must parse only one row, containing the choice (value)
                    chrow = root.child(i)
                    for rownb in xrange(chrow.rowCount()):
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                        curr = chrow.child(rownb, 0).text()
                        if curr == value:
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                            # set rownb to the row of the current choice
                            break
                    else:
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                        raise TypeError('CHOICE row not found')
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                    parseRow(chrow, rownb, dest=ptr)
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                    ptr.Reset(state)
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                    intMappings = root.child(i, 3).data(INTMAP)
                    for enumerant, num in intMappings.viewitems():
                        if enumerant == value:
                            ptr.kind.Set(num)
                            break
                    else:
                        raise TypeError('CHOICE determinant not found')
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                elif asnType == 'INTEGER':
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                    ptr.Set(int(value))
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                elif asnType == 'REAL':
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                    ptr.Set(float(value))
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                elif asnType == 'BOOLEAN':
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                    boolValue = value == 'True'
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                    ptr.Set(boolValue)
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                elif asnType == 'ENUMERATED':
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                    intMappings = root.child(i, 3).data(INTMAP)
                    for enumerant, num in intMappings.viewitems():
                        if enumerant == value:
                            ptr.Set(num)
                            break
                    else:
                        raise TypeError('ENUMERATED value not found')
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                else:  # Strings
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                    ptr.SetFromPyString(value)
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            if choice != -1:
                # Read only the row of the choice selection
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                stateBefore = dest.GetState()
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                parseRow(root, choice, dest, seqOf=False)
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                dest.Reset(stateBefore)
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            else:
                for i in xrange(nbRows):  # for each child row
                    stateBefore = dest.GetState()
                    parseRow(root, i, dest, seqOf=seqOf)
                    dest.Reset(stateBefore)
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        else:  # single elements (all but SeqOf, Choice, Sequence)
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            row = root.row()
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            try:
                value = self.model.item(row, 3).text()
                asnType = self.model.item(row, 1).text()
            except AttributeError:
                # Empty SEQUENCEs elems contain nothing
                value = ''
                asnType = None
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            if asnType == 'INTEGER':
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                # TESTED OK
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                dest.Set(int(value))
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            elif asnType == 'REAL':
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                # TESTED OK
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                dest.Set(float(value))
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            elif asnType == 'BOOLEAN':
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                # TESTED OK
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                dest.Set(True if value == 'True' else False)
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            elif asnType == 'ENUMERATED':
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                # TESTED OK
                intMappings = self.model.item(row, 3).data(INTMAP)
                for enumerant, num in intMappings.viewitems():
                    if enumerant == value:
                        dest.Set(num)
                        break
                else:
                    self.log.error('Missing enumerted or bug - please report')
            elif asnType == 'STRING':
                dest.SetFromPyString(value)
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            else:
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                self.log.error('Unsupported type: please report bug')
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    def getVariable(self, root=None, dest=None):
        ''' Read the ASN.1 variable from the tree editor
            root allows to specify which variable/row to start from
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            dest is a ctypes instance of the given type, that
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            will be filled by the recursive parser.
        '''
        assert dest is not None
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        root = root or self.treeItem
        row = root.row()
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        name = root.text()
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        asnType = self.model.item(row, 1).text()
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        if asnType == 'SEQOF':
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            nbRows = int(self.model.item(row, 3).text())
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            self.parseModel(root, nbRows=nbRows, dest=dest)
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            dest.SetLength(nbRows)
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        elif asnType == 'CHOICE':
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            value = self.model.item(row, 3).text()
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            # We must parse only one row, containing the choice (value)
            for rownb in xrange(root.rowCount()):
                curr = root.child(rownb, 0).text()
                if curr == value:
                    break
            else:
                raise TypeError('CHOICE ROW not found')
            self.parseModel(root, dest=dest, choice=rownb)
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            intMappings = self.model.item(row, 3).data(INTMAP)
            for enumerant, num in intMappings.viewitems():
                if enumerant == value:
                    dest.kind.Set(num)
                    break
            else:
                raise TypeError('CHOICE discriminant not found')
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        else:
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            self.parseModel(root, dest=dest)
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    def updateModel(self, root, ptr, nbRows=-1, choice=-1):
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        ''' Recursive update of the values in the GUI from ASN.1 instance '''
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        def fillRow(root, i, dest, seqOf=False):
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            name    = root.child(i, 0).text().replace('-', '_')
            asnType = root.child(i, 1).text()
            child   = root.child(i, 3)
            ptr = getattr(dest, name) if not seqOf else dest
            if seqOf:
                ptr = ptr[i]
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            if asnType in ('INTEGER', 'REAL'):
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                child.setText(str(ptr.Get()))
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            elif asnType == 'BOOLEAN':
                child.setText('True' if ptr.Get() else 'False')
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            elif asnType == 'STRING':
                child.setText(ptr.GetPyString())
            elif asnType == 'ENUMERATED':
                value = ptr.Get()
                intMappings = child.data(INTMAP)
                for enumerant, num in intMappings.viewitems():
                    if num == value:
                        child.setText(enumerant)
                        break
                else:
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                    raise TypeError("ENUMERATED value not found")
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            elif asnType in ('SEQUENCE', 'SET'):
                self.updateModel(root.child(i), ptr)
            elif asnType == 'CHOICE':
                state = ptr.GetState()
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                valueNum = ptr.kind.Get()
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                ptr.Reset(state)
                intMappings = child.data(INTMAP)
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                choiceList = child.data(CHOICE_LIST)
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                for enumerant, num in intMappings.viewitems():
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                    if num == valueNum:
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                        child.setText(str(enumerant))
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                        # Find the choice row number
                        for rowNb, choiceName in enumerate(choiceList):
                            if choiceName == enumerant:
                                fillRow(root.child(i),
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                                        rowNb, dest=ptr)
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                                break
                        else:
                            raise TypeError('CHOICE ROW not found')
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                        break
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                else:
                    raise TypeError('fillRow: CHOICE determinant not found')
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            elif asnType == 'SEQOF':
                state = ptr.GetState()
                size = ptr.GetLength()
                ptr.Reset(state)
                child.setText(str(size))
                self.updateModel(root.child(i), ptr, nbRows=size)
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            if asnType in ('INTEGER', 'REAL', 'SEQOF'):
                plotters = child.data(PLOTTERS)
                if plotters is not None:
                    self.log.debug("updateModel - updatePlot call")
                    value = float(child.text())
                    for plotter in plotters:
                        self.plotterBackend.updatePlot(plotter, value)
                    self.log.debug("updateModel - updatePlot end")
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        if choice != -1:
            stateBefore = ptr.GetState()
            fillRow(root, choice, ptr)
            ptr.Reset(stateBefore)
        else:
            if root.hasChildren():
                seqOf = True if nbRows != -1 else False
                if not seqOf:
                    nbRows = root.rowCount()
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                for i in xrange(nbRows):
                    stateBefore = ptr.GetState()
                    fillRow(root, i, ptr, seqOf=seqOf)
                    ptr.Reset(stateBefore)
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    def updateVariable(self, root=None, asn1Var=None):
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        ''' Update the variable value (when loading a TC or receiving a TM) '''
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        root         = root or self.treeItem
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        asn1Instance = asn1Var or self.asn1Instance
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        row          = root.row()
        asnType      = self.model.item(row, 1).text()
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        asn1Instance.Reset()
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        if asnType == 'SEQOF':
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            # Set the number of items in column 3
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            nbElem = asn1Instance.GetLength()
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            self.model.item(row, 3).setText(str(nbElem))
            # And set the values recursively
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            self.updateModel(root, ptr=asn1Instance, nbRows=nbElem)
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        elif asnType == 'CHOICE':
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            kind = asn1Instance.kind.Get()
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            # get the mapping to retrieve the choice name from the kind
            intMappings = self.model.item(row, 3).data(INTMAP)
            for enumerant, num in intMappings.viewitems():
                if num == kind:
                    break
            else:
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                self.log.error("CHOICE index not found in DV.py")
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            self.model.item(row, 3).setText(enumerant)
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            # Find the row and set the value
            for rownb in xrange(root.rowCount()):
                if enumerant == root.child(rownb, 0).text():
                    break
            else:
                raise TypeError('(SET) CHOICE ROW not found')
            self.updateModel(root, asn1Instance, choice=rownb)
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        elif asnType in ('INTEGER', 'REAL'):
            self.model.item(row, 3).setText(str(asn1Instance.Get()))
        elif asnType == 'BOOLEAN':
            value = 'True' if asn1Instance.Get() else 'False'
            self.model.item(row, 3).setText(value)
        elif asnType == 'STRING':
            self.model.item(row, 3).setText(asn1Instance.GetPyString())
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        elif asnType == 'ENUMERATED':
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            value = asn1Instance.Get()
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            # get the mapping to retrieve the integer value
            intMappings = self.model.item(row, 3).data(INTMAP)
            for enumerant, num in intMappings.viewitems():
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                # XXX if value is not initialized and no enum has value 0
                # an error will be raised
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                if num == value:
                    self.model.item(row, 3).setText(enumerant)
                    break
            else:
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                self.log.error("ENUMERATED value '{}' not found".format(value))
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        else:  # SEQUENCE or SET
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            self.updateModel(root, asn1Instance)
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        if asnType in ('INTEGER', 'REAL', 'SEQOF'):
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            plotters = self.model.item(row, 3).data(PLOTTERS) or []
            value = self.model.item(row, 3).text()
            for plotter in plotters:
                self.plotterBackend.updatePlot(plotter, float(value))
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        self.hideUnusedFields(root, True, row=row)
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        if self.plotterBackend is not None:
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            self.plot_refresh.emit()
            #self.plotterBackend.refresh()
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        # Inform the thread to update the tree (expand all branches)
        self.expandTree.emit()

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    def tmToEditor(self, emit_msc=True):
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        ''' Check validity of a TM and update the viewer with the value '''
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        self.updateVariable()
        # Send value to the MSC recorder
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        name = self.item['id']
        msg = name + '(' + vn.format_gser(self.asn1Instance.GSER()) + ')'
        self.log.debug('MSC: '+ msg)
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        if emit_msc:
            self.msc.emit('in', msg)
        self.new_tm.emit()
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    @Slot()
    def receivedTM(self):
        ''' TM received from another thread (polling queue) '''
        if self.pendingTM:
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            self.log.debug("Got TM from MsgQ")
            self.tmToEditor()
            # Send TM to user custom widgets
            for each in self.tm_clients:
                each.update(self.asn1Instance)
            self.pendingTM = False
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    def ProcessUDPTM(self, uperMsg):
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        ''' Decode an uPER-encoded TM (e.g. received from UDP sockets)
            and update the model '''
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        self.log.error('DEPRECATED - UDP channel not supported anymore')
        return
        #native_tm = self.backend.decode_uPER(uperMsg)
        #pythonVar = self.backend.fromASN1ToPyside(native_tm)
        #self.tmToEditor(pythonVar)
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#   def saveTC(self):
#   DEPRECATED - Load/Save TC must be done with databases
#       ''' Encode the data using GSER (ASN.1 Value Notation) and save it
#       to a file'''
#       name = self.treeItem.text()
#       gser = self.gser(use_dash=True)
#       self.log.debug('Saving ' + gser)
#       filename = QFileDialog.getSaveFileName(self,
#                                              "Save TC",
#                                              ".",
#                                              "ASN.1 Variable (*.tc)")[0]
#       try:
#           if filename.split('.')[-1] != 'tc':
#               filename += ".tc"
#           tcFile = QFile(filename)
#           tcFile.open(QIODevice.WriteOnly | QIODevice.Text)
#           tcFile.write(str(gser))
#           tcFile.close()
#       except:
#           pass
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    def gser(self, use_dash=False):
        ''' Helper API function: return the GSER representation of the data '''
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        self.getVariable(dest=self.asn1Instance)
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        res = vn.format_gser(self.asn1Instance.GSER())
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        return res if use_dash else res.replace('-', '_')
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    def to_asn1scc_ctypes(self, root, dest, ASN1Mod, sort, ASN1_AST):
        ''' Helper API function: read variable and set ASN.1 Native variable
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        Inputs: root: select which variable to parse
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                dest: Native ctypes variable (will be modified)
                ASN1Mod: python module containing ctypes DV access
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                sort: root ASN.1 typename (with dash, no underscores)
                ASN1_AST: full AST generated by ASN1SCC
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        '''
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        # DEPRECATED - call getVariable directly
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        self.getVariable(root=root, dest=dest)
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    def sendTC(self):
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        ''' Encode and send the TC to the main TASTE binary
            using message queue or UDP '''
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        self.getVariable(dest=self.asn1Instance)
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        gser = vn.format_gser(self.asn1Instance.GSER())
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        msg = "{name}({gser})".format(name=self.treeItem.text(), gser=gser)
        self.log.debug('out ' + msg)
        self.msc.emit('out', msg)
        self.backend.sendTC(self.asn1Instance)
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#   def loadTC(self, dest=None):
#   DEPRECATED / Load/Save of TC must be done with databases
#       ''' Load/Decode a TC and populate the values in the model '''
#       dest = dest or self.asn1Instance
#       filename = QFileDialog.getOpenFileName(self,
#                                              "Open TC",
#                                              ".",
#                                              "ASN.1 Variable (*.tc)")[0]
#       if len(filename) == 0:
#           return
#       try:
#           tcFile = QFile(filename)
#           tcFile.open(QIODevice.ReadOnly | QIODevice.Text)
#           asnVN = str(tcFile.readData(tcFile.size()))
#           tcFile.close()
#           vn.valueNotationToCTypes(gser=asnVN,
#                                    dest=dest,
#                                    sort=,
#                                    ASN1Mod=,
#                                    ASN1_AST=)
#       except:
#           self.log.error('TC not loaded')
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    def dataPath(self, idx):
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        ''' Create a textual representation of a field path
            (e.g. myTM.myChoice.position.x) '''
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        if not idx.isValid():
            return ''
        subpath = self.dataPath(idx.parent())
        if len(subpath)>0:
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            subpath += '.'
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        subpath += idx.data()
        return subpath

    def pathToIdx(self, path, root=None):
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        ''' Find an index in the model based from a dot-splitted
            path representation '''
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        if root is None:
            root = self.treeItem.index()
        if len(path) == 1:
            return QPersistentModelIndex(root) if root.data() == path[0] else None
        else:
            # Recursive call for each child
            for i in range(self.model.itemFromIndex(root).rowCount()):
                result = self.pathToIdx(path[1:], root.child(i, 0))
                if result is not None:
                    return result

    def newPlot(self, fifoId=-1, meter=False):
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        ''' Add a set of data (based on selected lines) to a new plotter
            or speedometer '''
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        selectedIdxs = self.selectedIndexes()
        # Count the number of eligible lines for plotting (discard non-numerical types)
        eligible=[]
        for idx in selectedIdxs:
            if idx.column() > 0:
                continue
            asntype = idx.sibling(idx.row(), 1).data()
            if asntype in ('INTEGER', 'REAL', 'SEQOF'):
                self.log.info('Candidate for plot: '+ self.dataPath(idx))
                discard = False
                if fifoId > 0:
                    currData=idx.sibling(idx.row(), 3).data(PLOTTERS)
                    if currData is not None:
                        for elem in currData:
                            if elem['fifoId'] == fifoId:
                                discard = True
                if not discard:
                    eligible.append(idx.sibling(idx.row(), 3))
                else:
                    self.log.info('(but discarding because already in current plot)')
            else:
                self.log.warning('Cannot plot {data} (type {asntype} is not numerical)'.format(data=idx.data(), asntype=asntype))
        if len(eligible) == 0:
            self.log.warning('No valid lines selected for the plot')
            self.statusBarMessage.emit('No valid lines selected for the plot')
            return
        if fifoId == -1 and not meter:
            fifoId = self.plotterBackend.newPlot()
        for idx in eligible:
            dataPath = self.dataPath(idx.sibling(idx.row(), 0))
            currData = idx.data(PLOTTERS)
            minRange = idx.data(MIN_RANGE)
            maxRange = idx.data(MAX_RANGE)
            if meter:
                fifoId = self.plotterBackend.newMeter(dataPath, minRange, maxRange)
            if currData is None:
                currData = []
            currData.append({'fifoId': int(fifoId), 'curveName': dataPath})
            idx.model().setData(idx, currData, PLOTTERS)
            # Keep track of all plotted values - used when saving the model state
            persistentIdx = QPersistentModelIndex(idx)
            if persistentIdx not in self.plottedIdxs:
                self.plottedIdxs.append(persistentIdx)

    def addToPlot(self):
        ''' Add a new curve to an existing plot window '''
        fifoId = self.sender().text().split()[-1]
        self.newPlot(int(fifoId))

    def setPlotterBackend(self, backend):
        ''' Set a "pointer" to the GnuPlot/Meter backend module '''
        self.plotterBackend = backend

    def meter(self):
        ''' Create speedometers for the selected values '''
        self.newPlot(meter=True)

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    def custom(self, custom_class):
        ''' Handle user-defined widgets: for TC, provide access to the Send
        and Update APIs. Defined differently for the asn1Viwer (TM) class '''
        custom_handler = custom_class(self.item['nodeTypename']
                                      .replace('-', '_'), parent=self)
        # Attach the docking widget to the GUI (XXX refactor)
        self.parent().parent().parent().addDockWidget(Qt.RightDockWidgetArea,
                                                      custom_handler)
        custom_handler.setFloating(True)

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    def displaytip(self, index):
        ''' Display a tip when the mouse moves above a cell '''
        asnType = index.sibling(index.row(), 1).data()
        constraint = index.sibling(index.row(), 2).data()
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        self.statusBarMessage.emit(asnType + ' ' +
                             (constraint if constraint is not None else ''))
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    @Slot(QModelIndex, int, int)
    def seqofDisplay(self, parent, val, max):
        ''' Slot updating the number of SEQOF elements displayed '''
        for row in range(max):
            if int(row) < int(val):
                display = False
            else:
                display = True
            self.setRowHidden(row, parent, display)
        self.expandBranch.emit(parent)

    @Slot(QModelIndex, int, int)
    def choiceDisplay(self, parent, nbOfElem, choice):
        ''' Slot updating the current selected CHOICE element '''
        for row in range(nbOfElem):
            if int(choice) == int(row):
                display = False
            else:
                display = True
            self.setRowHidden(row, parent, display)
        self.expandBranch.emit(parent)

    def addInteger(self, elem):
        # Set default value (min range):
        val = QStandardItem('%d' % elem["minR"])
        # Define type attributes, later used to define the proper cell editor
        val.setData(elem["type"], ASN1TYPE)
        try:
            val.setData(elem["minR"], MIN_RANGE)
        except OverflowError:
            val.setData(-1000000, MIN_RANGE)
        try:
            val.setData(elem["maxR"], MAX_RANGE)
        except OverflowError:
            val.setData(1000000, MAX_RANGE)
        # Set the text for the constraint and add it to the 3rd column:
        constraint = QStandardItem('(%d..%d)' % (elem["minR"], elem["maxR"]))
        constraint.setData(QBrush(QColor("gray")), Qt.ForegroundRole)
        return {"value": val, "constraint": constraint}

    def addReal(self, elem):
        # Set default value (min range):
        val = QStandardItem('%.2f' % elem["minR"])
        # Define type attributes, later used to define the proper cell editor
        val.setData(elem["type"], ASN1TYPE)
        try:
            val.setData(elem["minR"], MIN_RANGE)
        except OverflowError:
            # Python cannot handle 64bit double - reducing the range in case of overflow
            val.setData(-10000000.0, MIN_RANGE)
        try:
            val.setData(elem["maxR"], MAX_RANGE)
        except OverflowError:
            val.setData(10000000.0, MAX_RANGE)
        # Set the text for the constraint and add it to the 3rd column:
        constraint = QStandardItem('(%.2f..%.2f)' % (elem["minR"], elem["maxR"]))
        constraint.setData(QBrush(QColor("gray")), Qt.ForegroundRole)
        return {"value": val, "constraint": constraint}

    def addEnum(self, elem):
        # Set default value (first enum value)
        val = QStandardItem(elem["values"][0])
        # Define type attributes, later used to define the proper cell editor
        val.setData(elem["type"], ASN1TYPE)  # type (ENUMERATED)
        val.setData(elem["values"], CHOICE_LIST)  # enum values
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        val.setData(elem["valuesInt"], INTMAP) # mapping name - value
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        constraint = QStandardItem()
        return {"value": val, "constraint": constraint}

    def addString(self, elem):
        # Set default value (empty string)
        if "default" in elem:
            defaultString = elem["default"]
        else:
            defaultString = ""
        val = QStandardItem(defaultString)
        # Define type attributes, later used to define the proper cell editor
        val.setData(elem["type"], ASN1TYPE)  # type (IA5String)
        val.setData(elem["minSize"], MIN_RANGE)  # size min
        val.setData(elem["maxSize"], MAX_RANGE)  # size max
        # Set the text for the constraint and add it to the 3rd column:
        if elem["minSize"] == elem["maxSize"]:
            constraintStr = 'SIZE(%d)' % elem["minSize"]
        else:
            constraintStr = 'SIZE(%d..%d)' % (elem["minSize"], elem["maxSize"])
        constraint = QStandardItem(constraintStr)
        constraint.setData(QBrush(QColor("gray")), Qt.ForegroundRole)
        return {"value": val, "constraint": constraint}

    def addBool(self, elem):
        # Set default value (True or False)
        val = QStandardItem(elem["default"])
        # Define type attributes, later used to define the proper cell editor
        val.setData(elem["type"], ASN1TYPE)  # type (BOOLEAN)
        val.setData(['True', 'False'], CHOICE_LIST)  # enum values
        constraint = QStandardItem()
        return {"value": val, "constraint": constraint}

    def addSequence(self, elem, parent):
        types = []
        values = []
        constraints = []

        for child in elem["children"]:
            field = self.addItem(child)
            parent.appendRow(field["item"])
            types.append(field["type"])
            values.append(field["value"])
            constraints.append(field["constraint"])

        parent.appendColumn(types)
        parent.appendColumn(constraints)
        parent.appendColumn(values)
        constraint = QStandardItem()
        val = QStandardItem()
        return {"value": val, "constraint": constraint}

    def addSeqOf(self, elem, parent):
        types = []
        values = []
        constraints = []
        for i in range(elem["maxSize"]):
            elem["seqoftype"]["id"] = "elem_%d" % i
            field = self.addItem(elem["seqoftype"])
            parent.appendRow(field["item"])
            types.append(field["type"])
            values.append(field["value"])
            constraints.append(field["constraint"])
        parent.appendColumn(types)
        parent.appendColumn(constraints)
        parent.appendColumn(values)
        if elem["minSize"] == elem["maxSize"]:
            constraintStr = 'SIZE(%d)' % elem["minSize"]
        else:
            constraintStr = 'SIZE(%d..%d)' % (elem["minSize"], elem["maxSize"])
        constraint = QStandardItem(constraintStr)
        constraint.setData(QBrush(QColor("gray")), Qt.ForegroundRole)
        val = QStandardItem('%d' % elem["minSize"])
        val.setData(elem["type"], ASN1TYPE)   # type (SEQOF)
        val.setData(elem["minSize"], MIN_RANGE)  # min number of elements
        val.setData(elem["maxSize"], MAX_RANGE)  # max number of elements
        return {"value": val, "constraint": constraint}

    def addChoice(self, elem, parent):
        types = []
        values = []
        constraints = []
        ids = []
        for choice in elem["choices"]:
            field = self.addItem(choice)
            ids.append(choice["id"])
            parent.appendRow(field["item"])
            types.append(field["type"])
            values.append(field["value"])
            constraints.append(field["constraint"])

        parent.appendColumn(types)
        parent.appendColumn(constraints)
        parent.appendColumn(values)

        val = QStandardItem(ids[0])  # default value: first choice
        # Define type attributes, later used to define the proper cell editor
        val.setData(elem["type"], ASN1TYPE)  # type (CHOICE)
        val.setData(ids, CHOICE_LIST)  # choice values
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        val.setData(elem["choiceIdx"], INTMAP) # mapping name - DV value
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        constraint = QStandardItem()
        return {"value": val, "constraint": constraint}

    def addItem(self, elem):
        # Add field name on the first column:
        field = QStandardItem(elem["id"])
        # Add type on the second column in gray:
        asnType = QStandardItem(elem["type"])
        asnType.setData(QBrush(QColor("gray")), Qt.ForegroundRole)

        # get the Value and Contraints fields for the different types:
        if elem["type"] == 'INTEGER':
            data = self.addInteger(elem)
        elif elem["type"] == 'REAL':
            data = self.addReal(elem)
        elif elem["type"] == 'BOOLEAN':
            data = self.addBool(elem)
        elif elem["type"] == 'ENUMERATED':
            data = self.addEnum(elem)
        elif elem["type"] == 'STRING':
            data = self.addString(elem)
        elif elem["type"] in ('SEQUENCE', 'SET'):
            data = self.addSequence(elem, field)
        elif elem["type"] == 'SEQOF':
            data = self.addSeqOf(elem, field)
        elif elem["type"] == 'CHOICE':
            data = self.addChoice(elem, field)
        else:
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            raise TypeError('Unsupported type: ' + elem["type"])
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            sys.exit(-1)
        return {"item": field, "type": asnType, "value": data["value"], "constraint": data["constraint"]}


class asn1Viewer(asn1Editor):
    ''' TM Viewing class. Fields are not editable '''
    def __init__(self, parent=None):
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        super(asn1Viewer, self).__init__(parent)
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        self.setEditTriggers(QAbstractItemView.NoEditTriggers)
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    def custom(self, custom_class):
        ''' Handle user-defined widgets: for TM make sure a signal is emitted
        with ASN1 value when a TM is received '''
        custom_handler = custom_class(parent=self)
        # Attach the docking widget to the GUI (XXX refactor)
        self.parent().parent().parent().addDockWidget(Qt.RightDockWidgetArea,
                                                      custom_handler)
        self.tm_clients.append(custom_handler)
        self.new_tm.connect(custom_handler.new_tm)
        custom_handler.setFloating(True)