sdlSymbols.py 31.7 KB
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#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""
    OpenGEODE - A tiny SDL Editor for TASTE

    This module contains the definition of the SDL symbols,
    including geometry and specific symbol behaviour when needed.

    All symbols inherit the generic Vertical- and Horizontal-
    Symbol classes defined in the "genericSymbols.py" module.

    Copyright (c) 2012-2013 European Space Agency

    Designed and implemented by Maxime Perrotin

    Contact: maxime.perrotin@esa.int
"""

__all__ = ['Input', 'Output', 'State', 'Task', 'ProcedureCall', 'Label',
           'Decision', 'DecisionAnswer', 'Join', 'Start', 'TextSymbol',
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           'Procedure', 'ProcedureStart', 'ProcedureStop', 'ASN1Viewer',
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           'StateStart', 'Process']
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#import traceback
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import logging
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from PySide.QtCore import Qt, QPoint, QRect, QRectF
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from PySide.QtGui import(QPainterPath, QBrush, QColor, QRadialGradient, QPen)
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from genericSymbols import HorizontalSymbol, VerticalSymbol, Comment
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from Connectors import Connection, JoinConnection, Channel
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import ogParser
import ogAST


LOG = logging.getLogger('sdlSymbols')


# SDL-specific: reserved keywords, to be highlighted in textboxes
# Two kind of formatting are possible: black bold, and red bold
SDL_BLACKBOLD = ['\\b{word}\\b'.format(word=word) for word in (
                'DCL', 'CALL', 'ELSE', 'IF', 'THEN', 'MANTISSA', 'BASE',
                'EXPONENT', 'TRUE', 'FALSE', 'MOD', 'FI', 'WRITE', 'WRITELN',
                'LENGTH', 'PRESENT', 'FPAR', 'TODO', 'FIXME', 'XXX',
                'CHECKME', 'PROCEDURE', 'EXTERNAL', 'IN', 'OUT', 'TIMER',
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                'SET_TIMER', 'RESET_TIMER', 'VIA', 'ENTRY', 'EXIT',
                'SYNTYPE', 'ENDSYNTYPE', 'CONSTANTS',
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                'NEWTYPE', 'ENDNEWTYPE', 'ARRAY', 'STRUCT', 'SYNONYM')]
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SDL_REDBOLD = ['\\b{word}\\b'.format(word=word) for word in (
              'INPUT', 'OUTPUT', 'STATE', 'DECISION', 'NEXTSTATE',
              'TASK', 'PROCESS', 'LABEL', 'JOIN', 'CONNECTION')]


# pylint: disable=R0904
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class Input(HorizontalSymbol):
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    ''' SDL INPUT Symbol '''
    _unique_followers = ['Comment']
    _insertable_followers = ['Task', 'ProcedureCall', 'Output', 'Decision',
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                             'Input', 'Label', 'Connect']
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    _terminal_followers = ['Join', 'State', 'ProcedureStop']
    completion_list = set()

    common_name = 'input_part'
    # Define reserved keywords for the syntax highlighter
    blackbold = SDL_BLACKBOLD
    redbold = SDL_REDBOLD

    def __init__(self, parent=None, ast=None):
        ''' Create the INPUT symbol '''
        ast = ast or ogAST.Input()
        self.branch_entrypoint = None
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        if not ast.pos_y and parent:
            # Make sure the item is placed below its parent
            ast.pos_y = parent.y() + parent.boundingRect().height() + 10
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        super(Input, self).__init__(parent, text=ast.inputString,
                x=ast.pos_x, y=ast.pos_y, hyperlink=ast.hyperlink)
        self.set_shape(ast.width, ast.height)
        gradient = QRadialGradient(50, 50, 50, 50, 50)
        gradient.setColorAt(0, QColor(255, 240, 170))
        gradient.setColorAt(1, Qt.white)
        self.setBrush(QBrush(gradient))
        self.terminal_symbol = False
        self.parser = ogParser
        if ast.comment:
            Comment(parent=self, ast=ast.comment)

    def insert_symbol(self, parent, x, y):
        ''' Insert Input symbol - propagate branch Entry point '''
        # Make sure that parent is a state, not a sibling input
        item_parent = (parent if not isinstance(parent, Input)
                       else parent.parentItem())
        self.branch_entrypoint = item_parent.branch_entrypoint
        super(Input, self).insert_symbol(item_parent, x, y)

    def set_shape(self, width, height):
        ''' Compute the polygon to fit in width, height '''
        path = QPainterPath()
        path.lineTo(width, 0)
        path.lineTo(width - 11, height / 2)
        path.lineTo(width, height)
        path.lineTo(0, height)
        path.lineTo(0, 0)
        self.setPath(path)
        super(Input, self).set_shape(width, height)


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class Connect(Input):
    ''' Connect point below a nested state '''
    common_name = 'connect_part'
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    auto_expand = False
    resizeable = False
    # Symbol must not use antialiasing, otherwise the middle line is too thick
    _antialiasing = False
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    def set_shape(self, width, height):
        ''' Compute the polygon to fit in width, height '''
        self.setPen(QPen(Qt.blue))
        self.textbox_alignment = Qt.AlignLeft | Qt.AlignTop
        path = QPainterPath()
        path.moveTo(0, 0)
        path.lineTo(0, height)
        #path.moveTo(0, height / 2)
        #path.lineTo(width, height / 2)
        self.setPath(path)
        super(Input, self).set_shape(width, height)

    def resize_item(self, rect):
        ''' Symbol cannot be resized '''
        return

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# pylint: disable=R0904
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class Output(VerticalSymbol):
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    ''' SDL OUTPUT Symbol '''
    _unique_followers = ['Comment']
    _insertable_followers = [
            'Task', 'ProcedureCall', 'Output', 'Decision', 'Label']
    _terminal_followers = ['Join', 'State', 'ProcedureStop']
    common_name = 'output'
    # Define reserved keywords for the syntax highlighter
    blackbold = SDL_BLACKBOLD
    redbold = SDL_REDBOLD
    completion_list = set()

    def __init__(self, parent=None, ast=None):
        ast = ast or ogAST.Output()
        super(Output, self).__init__(parent=parent,
                text=ast.inputString, x=ast.pos_x, y=ast.pos_y,
                hyperlink=ast.hyperlink)
        self.set_shape(ast.width, ast.height)

        self.setBrush(QBrush(QColor(255, 255, 202)))
        self.terminal_symbol = False
        self.parser = ogParser
        if ast.comment:
            Comment(parent=self, ast=ast.comment)

    def set_shape(self, width, height):
        ''' Compute the polygon to fit in width, height '''
        path = QPainterPath()
        path.lineTo(width - 11, 0)
        path.lineTo(width, height / 2)
        path.lineTo(width - 11, height)
        path.lineTo(0, height)
        path.lineTo(0, 0)
        self.setPath(path)
        super(Output, self).set_shape(width, height)


# pylint: disable=R0904
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class Decision(VerticalSymbol):
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    ''' SDL DECISION Symbol '''
    _unique_followers = ['Comment']
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    _insertable_followers = ['DecisionAnswer', 'Task', 'ProcedureCall',
                             'Output', 'Decision', 'Label']
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    _terminal_followers = ['Join', 'State', 'ProcedureStop']
    common_name = 'decision'
    # Define reserved keywords for the syntax highlighter
    blackbold = SDL_BLACKBOLD + ['\\b{}\\b'.format(word)
                                   for word in ('AND', 'OR')]
    redbold = SDL_REDBOLD
    completion_list = {'length', 'present'}

    def __init__(self, parent=None, ast=None):
        ast = ast or ogAST.Decision()
        # Define the point where all branches of the decision can join again
        self.connectionPoint = QPoint(ast.width / 2, ast.height + 30)
        super(Decision, self).__init__(parent, text=ast.inputString,
                x=ast.pos_x, y=ast.pos_y, hyperlink=ast.hyperlink)
        self.set_shape(ast.width, ast.height)
        self.setBrush(QColor(255, 255, 202))
        self.minDistanceToSymbolAbove = 0
        self.parser = ogParser
        self.text_alignment = Qt.AlignHCenter
        if ast.comment:
            Comment(parent=self, ast=ast.comment)

    @property
    def terminal_symbol(self):
        '''
            Compute dynamically if the item is terminal by checking
            if all its branches end with a terminator
        '''
        for branch in self.branches():
            if not branch.last_branch_item.terminal_symbol:
                return False
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        return True
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    def branches(self):
        ''' Return the list of decision answers (as a generator) '''
        return (branch for branch in self.childSymbols()
                if isinstance(branch, DecisionAnswer))

    def set_shape(self, width, height):
        ''' Define polygon points to draw the symbol '''
        path = QPainterPath()
        path.moveTo(width / 2, 0)
        path.lineTo(width, height / 2)
        path.lineTo(width / 2, height)
        path.lineTo(0, height / 2)
        path.lineTo(width / 2, 0)
        self.setPath(path)
        super(Decision, self).set_shape(width, height)

    def resize_item(self, rect):
        ''' On resize event, make sure connection points are updated '''
        delta_y = self.boundingRect().height() - rect.height()
        super(Decision, self).resize_item(rect)
        self.connectionPoint.setX(self.boundingRect().center().x())
        self.connectionPoint.setY(self.connectionPoint.y() - delta_y)
        self.update_connections()

    def update_connections(self):
        ''' Redefined - update arrows shape below connection point '''
        super(Decision, self).update_connections()
        for branch in self.branches():
            for cnx in branch.last_branch_item.connections():
                cnx.reshape()

    def updateConnectionPointPosition(self):
        ''' Compute the joining point of decision branches '''
        new_y = 0
        new_x = self.boundingRect().width() / 2.0
        answers = False
        for branch in self.branches():
            answers = True
            last_cnx = None
            last = branch.last_branch_item
            try:
                # To compute the branch length, we must keep only the symbols,
                # so we must remove the last connection (if any)
                last_cnx, = (c for c in last.childItems() if
                    isinstance(c, Connection) and not
                    isinstance(c.child, (Comment, HorizontalSymbol)))
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                # Don't set parent item to None to avoid Qt segfault
                last_cnx.setParentItem(self)
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            except ValueError:
                pass
            branch_len = branch.y() + (
                    branch.boundingRect() |
                    branch.childrenBoundingRect()).height()
            try:
                last_cnx.setParentItem(last)
            except AttributeError:
                pass
            # If last item was a decision, use its connection point
            # position to get the length of the branch:
            try:
                branch_len = (last.connectionPoint.y() +
                        self.mapFromScene(0, last.scenePos().y()).y())
            except AttributeError:
                pass
            # Rounded with int() -> mandatory when view scale has changed
            new_y = int(max(new_y, branch_len))
        if not answers:
            new_y = int(self.boundingRect().height())
        new_y += 15
        delta = new_y - self.connectionPoint.y()
        self.connectionPoint.setY(new_y)
        self.connectionPoint.setX(new_x)
        if delta != 0:
            child = self.next_aligned_symbol()
            try:
                child.moveBy(0, delta)
            except AttributeError:
                pass
        self.update_connections()


# pylint: disable=R0904
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class DecisionAnswer(HorizontalSymbol):
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    ''' If Decision is a "switch", DecisionAnswer is a "case" '''
    _insertable_followers = ['DecisionAnswer', 'Task', 'ProcedureCall',
                        'Output', 'Decision', 'Label']
    _terminal_followers = ['Join', 'State', 'ProcedureStop']
    common_name = 'alternative_part'
    # Define reserved keywords for the syntax highlighter
    blackbold = SDL_BLACKBOLD
    redbold = SDL_REDBOLD
    completion_list = set()

    def __init__(self, parent=None, ast=None):
        ast = ast or ogAST.Answer()
        # temp, FIXME
        self.width, self.height = ast.width, ast.height
        self.terminal_symbol = False
        # last_branch_item is used to compute branch length
        # for the connection point positionning
        self.last_branch_item = self
        super(DecisionAnswer, self).__init__(parent,
                text=ast.inputString,
                x=ast.pos_x, y=ast.pos_y, hyperlink=ast.hyperlink)
        self.set_shape(ast.width, ast.height)
        #self.setPen(QColor(0, 0, 0, 0))
        self.branch_entrypoint = self
        self.parser = ogParser

    def insert_symbol(self, parent, x, y):
        ''' ANSWER-specific insersion behaviour: link to connection point '''
        if not parent:
            return
        # Make sure that parent is a state, not a sibling input
        item_parent = (parent if not isinstance(parent, DecisionAnswer)
                       else parent.parentItem())
        super(DecisionAnswer, self).insert_symbol(item_parent, x, y)
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        self.last_branch_item.connectionBelow = \
                JoinConnection(self.last_branch_item, item_parent)
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    def boundingRect(self):
        return QRectF(0, 0, self.width, self.height)

    def set_shape(self, width, height):
        ''' ANSWER has round, disjoint sides - does not fit in a polygon '''
        self.width, self.height = width, height
        point = width / 2.85
        path = QPainterPath()
        left = QRect(0, 0, point, height)
        right = QRect(width - point, 0, point, height)
        path.arcMoveTo(left, 125)
        path.arcTo(left, 125, 110)
        path.arcMoveTo(right, -55)
        path.arcTo(right, -55, 110)
        path.moveTo(width, height)
        self.setPath(path)
        super(DecisionAnswer, self).set_shape(width, height)


# pylint: disable=R0904
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class Join(VerticalSymbol):
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    ''' JOIN symbol (GOTO) '''
    auto_expand = False
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    arrow_head = 'simple'
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    common_name = 'terminator_statement'
    # Define reserved keywords for the syntax highlighter
    blackbold = SDL_BLACKBOLD
    redbold = SDL_REDBOLD
    completion_list = set()

    def __init__(self, parent=None, ast=None):
        if not ast:
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            ast = ogAST.Terminator(defName='')
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            ast.pos_y = 0
            ast.width = 35
            ast.height = 35
        super(Join, self).__init__(parent, text=ast.inputString,
                x=ast.pos_x, y=ast.pos_y, hyperlink=ast.hyperlink)
        self.set_shape(ast.width, ast.height)
        self.setPen(QPen(Qt.blue))
        self.terminal_symbol = True
        self.parser = ogParser

    def resize_item(self, rect):
        ''' Redefinition of the resize item (block is a square) '''
        size = min(rect.width(), rect.height())
        rect.setWidth(size)
        rect.setHeight(size)
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        super(Join, self).resize_item(rect)
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    def set_shape(self, width, height):
        ''' Define the bouding rectangle of the JOIN symbol '''
        circ = min(width, height)
        path = QPainterPath()
        path.addEllipse(0, 0, circ, circ)
        self.setPath(path)
        super(Join, self).set_shape(width, height)


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class ProcedureStop(Join):
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    ''' Procedure STOP symbol - very similar to JOIN '''
    # Define reserved keywords for the syntax highlighter
    blackbold = SDL_BLACKBOLD
    redbold = SDL_REDBOLD
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    def __init__(self, parent=None, ast=None):
        if not ast:
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            ast = ogAST.Terminator(defName='')
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            ast.pos_y = 0
            ast.width = 35
            ast.height = 35
        super(ProcedureStop, self).__init__(parent, ast)
    completion_list = set()

    def set_shape(self, width, height):
        ''' Define the symbol shape '''
        circ = min(width, height)
        path = QPainterPath()
        path.addEllipse(0, 0, circ, circ)
        point1 = path.pointAtPercent(0.625)
        point2 = path.pointAtPercent(0.125)
        point3 = path.pointAtPercent(0.875)
        point4 = path.pointAtPercent(0.375)
        path.moveTo(point1)
        path.lineTo(point2)
        path.moveTo(point3)
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        path.lineTo(point4)
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        self.setPath(path)
        # call Join superclass, otherwise symbol will take Join shape
        super(Join, self).set_shape(circ, circ)


# pylint: disable=R0904
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class Label(VerticalSymbol):
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    ''' LABEL symbol '''
    _insertable_followers = [
            'Task', 'ProcedureCall', 'Output', 'Decision', 'Label']
    _terminal_followers = ['Join', 'State', 'ProcedureStop']
    needs_parent = False
    # Define reserved keywords for the syntax highlighter
    blackbold = SDL_BLACKBOLD
    redbold = SDL_REDBOLD
    # Symbol must not use antialiasing, otherwise the middle line is too thick
    _antialiasing = False
    completion_list = set()

    def __init__(self, parent=None, ast=None):
        ast = ast or ogAST.Label()
        super(Label, self).__init__(parent, text=ast.inputString,
                x=ast.pos_x, y=ast.pos_y, hyperlink=ast.hyperlink)
        self.set_shape(ast.width, ast.height)
        self.setPen(QPen(Qt.blue))
        self.terminal_symbol = False
        self.textbox_alignment = Qt.AlignLeft | Qt.AlignTop
        self.parser = ogParser

    @property
    def common_name(self):
        return 'label' if self.hasParent else 'floating_label'

    def set_shape(self, width, height):
        ''' Define the shape of the LABEL symbol '''
        #print traceback.print_stack()
        path = QPainterPath()
        path.addEllipse(0, height / 2, width / 4, height / 2)
        path.moveTo(width / 4, height * 3 / 4)
        path.lineTo(width / 2, height * 3 / 4)
        # Add arrow head
        path.moveTo(width / 2 - 5, height * 3 / 4 - 5)
        path.lineTo(width / 2, height * 3 / 4)
        path.lineTo(width / 2 - 5, height * 3 / 4 + 5)
        # Add vertical line in the middle of the symbol
        path.moveTo(width / 2, 0)
        path.lineTo(width / 2, height)
        # Make sure the bounding rect is withing specifications
        path.moveTo(width, height)
        self.setPath(path)
        super(Label, self).set_shape(width, height)


# pylint: disable=R0904
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class Task(VerticalSymbol):
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    ''' TASK symbol '''
    _unique_followers = ['Comment']
    _insertable_followers = [
            'Task', 'ProcedureCall', 'Output', 'Decision', 'Label']
    _terminal_followers = ['Join', 'State', 'ProcedureStop']
    common_name = 'task'
    # Define reserved keywords for the syntax highlighter
    blackbold = SDL_BLACKBOLD
    redbold = SDL_REDBOLD
    completion_list = set()

    def __init__(self, parent=None, ast=None):
        ''' Initializes the TASK symbol '''
        ast = ast or ogAST.Task()
        super(Task, self).__init__(parent, text=ast.inputString,
                x=ast.pos_x, y=ast.pos_y, hyperlink=ast.hyperlink)
        self.set_shape(ast.width, ast.height)

        self.setBrush(QBrush(QColor(255, 255, 202)))
        self.terminal_symbol = False
        self.parser = ogParser
        if ast.comment:
            Comment(parent=self, ast=ast.comment)

    def set_shape(self, width, height):
        ''' Compute the polygon to fit in width, height '''
        path = QPainterPath()
        path.lineTo(width, 0)
        path.lineTo(width, height)
        path.lineTo(0, height)
        path.lineTo(0, 0)
        self.setPath(path)
        super(Task, self).set_shape(width, height)


# pylint: disable=R0904
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class ProcedureCall(VerticalSymbol):
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    ''' PROCEDURE CALL symbol '''
    _unique_followers = ['Comment']
    _insertable_followers = [
            'Task', 'ProcedureCall', 'Output', 'Decision', 'Label']
    _terminal_followers = ['Join', 'State', 'ProcedureStop']
    common_name = 'procedure_call'
    # Define reserved keywords for the syntax highlighter
    blackbold = ['\\bWRITELN\\b', '\\bWRITE\\b',
                 '\\bSET_TIMER\\b', '\\bRESET_TIMER\\b']
    redbold = SDL_REDBOLD
    completion_list = {'set_timer', 'reset_timer', 'write', 'writeln'}

    def __init__(self, parent=None, ast=None):
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        ast = ast or ogAST.Output(defName='')
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        super(ProcedureCall, self).__init__(parent,
                text=ast.inputString, x=ast.pos_x, y=ast.pos_y,
                hyperlink=ast.hyperlink)
        self.set_shape(ast.width, ast.height)
        self.setBrush(QBrush(QColor(255, 255, 202)))
        self.terminal_symbol = False
        self.parser = ogParser
        if ast.comment:
            Comment(parent=self, ast=ast.comment)

    def set_shape(self, width, height):
        ''' Compute the polygon to fit in width, height '''
        path = QPainterPath()
        path.addRect(0, 0, width, height)
        path.moveTo(7, 0)
        path.lineTo(7, height)
        path.moveTo(width - 7, 0)
        path.lineTo(width - 7, height)
        self.setPath(path)
        super(ProcedureCall, self).set_shape(width, height)


# pylint: disable=R0904
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class TextSymbol(HorizontalSymbol):
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    ''' Text symbol - used to declare variables, etc. '''
    common_name = 'text_area'
    needs_parent = False
    # Define reserved keywords for the syntax highlighter
    blackbold = SDL_BLACKBOLD
    redbold = SDL_REDBOLD
    completion_list = set()

    def __init__(self, ast=None):
        ''' Create a Text Symbol '''
        ast = ast or ogAST.TextArea()
        super(TextSymbol, self).__init__(parent=None,
                text=ast.inputString,
                x=ast.pos_x, y=ast.pos_y, hyperlink=ast.hyperlink)
        self.set_shape(ast.width, ast.height)
        self.setBrush(QBrush(QColor(249, 249, 249)))
        self.terminal_symbol = False
        self.setPos(ast.pos_x, ast.pos_y)
        # Disable hyperlinks for Text symbols
        self._no_hyperlink = True
        # Text is not centered in the box - change default alignment:
        self.textbox_alignment = Qt.AlignLeft | Qt.AlignTop
        self.parser = ogParser

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    def update_completion_list(self, pr_text):
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        ''' When text was entered, update TASK completion list '''
        # Get AST for the symbol
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        ast, _, _, _, _ = self.parser.parseSingleElement('text_area', pr_text)
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        Task.completion_list |= {dcl for dcl in ast.variables.keys()}

    def set_shape(self, width, height):
        ''' Define the polygon of the text symbol '''
        path = QPainterPath()
        path.moveTo(width - 10, 0)
        path.lineTo(0, 0)
        path.lineTo(0, height)
        path.lineTo(width, height)
        path.lineTo(width, 10)
        path.lineTo(width - 10, 10)
        path.lineTo(width - 10, 0)
        path.lineTo(width, 10)
        self.setPath(path)
        super(TextSymbol, self).set_shape(width, height)

    def resize_item(self, rect):
        ''' Text Symbol only resizes down or right '''
        if self.grabber.resize_mode.endswith('left'):
            return
        self.prepareGeometryChange()
        self.set_shape(rect.width(), rect.height())


class ASN1Viewer(TextSymbol):
    ''' Text symbol with dedicated text highlighting set of words for ASN.1 '''
    blackbold = ['\\b{}\\b'.format(word) for word in (
                 'DEFINITIONS', 'AUTOMATIC', 'TAGS', 'BEGIN', 'END', 'INTEGER',
                 'OCTET', 'STRING', 'BIT', 'REAL', 'SEQUENCE', 'OF', 'WITH',
                 'IMPORTS', 'FROM', 'SIZE', 'CHOICE', 'BOOLEAN')]


# pylint: disable=R0904
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class State(VerticalSymbol):
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    ''' SDL STATE Symbol '''
    _unique_followers = ['Comment']
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    _insertable_followers = ['Input', 'Connect']
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    arrow_head = 'simple'
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    common_name = 'terminator_statement'
    needs_parent = False
    # Define reserved keywords for the syntax highlighter
    blackbold = SDL_BLACKBOLD
    redbold = SDL_REDBOLD
    completion_list = set()

    def __init__(self, parent=None, ast=None):
        ast = ast or ogAST.State()
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        ast.inputString = getattr(ast, 'via', None) or ast.inputString
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        # Note: ast coordinates are in scene coordinates
        super(State, self).__init__(parent=parent,
                text=ast.inputString, x=ast.pos_x, y=ast.pos_y,
                hyperlink=ast.hyperlink)
        self.set_shape(ast.width, ast.height)
        self.setBrush(QBrush(QColor(255, 228, 213)))
        self.terminal_symbol = True
        if parent:
            try:
                # Map AST scene coordinates to get actual position
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                self.setPos(self.pos()
                            + self.mapFromScene(ast.pos_x, ast.pos_y))
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            except TypeError:
                self.update_position()
        else:
            # Use scene coordinates to position
            self.setPos(ast.pos_x, ast.pos_y)
        self.parser = ogParser
        if ast.comment:
            Comment(parent=self, ast=ast.comment)

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    @property
    def allow_nesting(self):
        ''' Redefinition - must be checked according to context '''
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        result = not any(elem in unicode(self).lower().strip()
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                       for elem in ('-', ',', '*', ' '))
        return result

    @property
    def nested_scene(self):
        ''' Redefined - nested scene per state must be unique '''
        return self._nested_scene

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    def double_click(self):
        ''' Catch a double click - Set nested scene '''
        for each, value in self.scene().composite_states.viewitems():
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            if unicode(self).lower() == unicode(each):
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                self.nested_scene = value
                break
        else:
            self.nested_scene = None

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    @nested_scene.setter
    def nested_scene(self, value):
        ''' Set the value of the nested scene '''
        self._nested_scene = value

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    def update_completion_list(self, pr_text):
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        ''' When text was entered, update state completion list '''
        # Get AST for the symbol
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        ast, _, _, _, _ = self.parser.parseSingleElement('state', pr_text)
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        State.completion_list |= set(ast.statelist)


    def set_shape(self, width, height):
        ''' Compute the polygon to fit in width, height '''
        path = QPainterPath()
        path.addRoundedRect(0, 0, width, height, height / 4, height)
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        if self.nested_scene and self.is_composite():
            # Distinguish composite states with dash line
            self.setPen(QPen(Qt.DashLine))
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        else:
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            self.setPen(QPen(Qt.SolidLine))
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        self.setPath(path)
        super(State, self).set_shape(width, height)

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    def get_ast(self, pr_text):
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        ''' Redefinition of the get_ast function for the state '''
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        ast, _, _, _, terminators = self.parser.parseSingleElement('state',
                                                                   pr_text)
        return ast, terminators
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class Process(HorizontalSymbol):
    ''' Process symbol '''
    _unique_followers = ['Comment']
    _allow_nesting = True
    common_name = 'process_definition'
    needs_parent = False
    # Define reserved keywords for the syntax highlighter
    blackbold = SDL_BLACKBOLD
    redbold = SDL_REDBOLD
    completion_list = set()
    is_singleton = True
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    arrow_head = 'angle'
    arrow_tail = 'angle'
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    def __init__(self, ast=None, subscene=None):
        ast = ast or ogAST.Process()
        super(Process, self).__init__(parent=None,
                                      text=ast.processName,
                                      x=ast.pos_x,
                                      y=ast.pos_y,
                                      hyperlink=ast.hyperlink)
        self.set_shape(ast.width, ast.height)
        self.setBrush(QBrush(QColor(255, 255, 202)))
        self.parser = ogParser
        if ast.comment:
            Comment(parent=self, ast=ast.comment)
        self.nested_scene = subscene

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    def insert_symbol(self, parent, x, y):
        ''' Redefinition - adds connection line to env '''
        super(Process, self).insert_symbol(parent, x, y)
        self.connection = self.connect_to_parent()

    def connect_to_parent(self):
        ''' Redefinition: creates connection to env with a channel '''
        return Channel(self)

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    def set_shape(self, width, height):
        ''' Compute the polygon to fit in width, height '''
        path = QPainterPath()
        path.moveTo(7, 0)
        path.lineTo(0, 7)
        path.lineTo(0, height - 7)
        path.lineTo(7, height)
        path.lineTo(width - 7, height)
        path.lineTo(width, height - 7)
        path.lineTo(width, 7)
        path.lineTo(width - 7, 0)
        path.lineTo(7, 0)
        self.setPath(path)
        super(Process, self).set_shape(width, height)


class Procedure(Process):
    ''' Procedure declaration symbol - Very similar to Process '''
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    _unique_followers = ['Comment']
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    _allow_nesting = True
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    common_name = 'procedure'
    needs_parent = False
    # Define reserved keywords for the syntax highlighter
    blackbold = SDL_BLACKBOLD
    redbold = SDL_REDBOLD
    completion_list = set()
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    is_singleton = False
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    def __init__(self, ast=None, subscene=None):
        ast = ast or ogAST.Procedure()
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        super(Process, self).__init__(parent=None,
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                text=ast.inputString,
                x=ast.pos_x, y=ast.pos_y, hyperlink=ast.hyperlink)
        self.set_shape(ast.width, ast.height)
        self.setBrush(QBrush(QColor(255, 255, 202)))
        self.parser = ogParser
        if ast.comment:
            Comment(parent=self, ast=ast.comment)
        self.nested_scene = subscene
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    def insert_symbol(self, parent, x, y):
        ''' Redefinition - no connection line to env '''
        super(Process, self).insert_symbol(parent, x, y)
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    def set_shape(self, width, height):
        ''' Compute the polygon to fit in width, height '''
        path = QPainterPath()
        path.addRect(7, 0, width - 14, height)
        path.moveTo(7, 0)
        path.lineTo(0, 7)
        path.lineTo(0, height - 7)
        path.lineTo(7, height)
        path.moveTo(width - 7, 0)
        path.lineTo(width, 7)
        path.lineTo(width, height - 7)
        path.lineTo(width - 7, height)
        self.setPath(path)
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        super(Process, self).set_shape(width, height)
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    def update_completion_list(self, **kwargs):
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        ''' When text was entered, update completion list of ProcedureCall '''
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        ProcedureCall.completion_list |= {unicode(self.text)}
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# pylint: disable=R0904
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class Start(HorizontalSymbol):
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    ''' SDL START Symbol '''
    _unique_followers = ['Comment']
    _insertable_followers = [
            'Task', 'ProcedureCall', 'Output', 'Decision', 'Label']
    _terminal_followers = ['Join', 'State', 'ProcedureStop']
    # There cannot be more than one START symbol in a scene
    is_singleton = True
    common_name = 'start'
    needs_parent = False
    # Define reserved keywords for the syntax highlighter
    blackbold = SDL_BLACKBOLD
    redbold = SDL_REDBOLD
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    has_text_area = False
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    def __init__(self, ast=None):
        ''' Create the START symbol '''
        ast = ast or ogAST.Start()
        self.terminal_symbol = False
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        super(Start, self).__init__(parent=None,
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                                    text=ast.inputString[slice(0, -6)],
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                                    x=ast.pos_x, y=ast.pos_y,
                                    hyperlink=ast.hyperlink)
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        self.set_shape(ast.width, ast.height)
        self.setBrush(QBrush(QColor(255, 228, 213)))
        # No hyperlink for START symbol because it has no text
        self._no_hyperlink = True
        self.parser = ogParser
        if ast.comment:
            Comment(parent=self, ast=ast.comment)

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    def __unicode__(self):
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        ''' User cannot enter text in the START symbol - Return dummy text '''
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        return u'START'
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    def set_shape(self, width, height):
        ''' Compute the polygon to fit in width, height '''
        path = QPainterPath()
        path.addRoundedRect(0, 0, width, height, height / 2, height / 2)
        self.setPath(path)
        super(Start, self).set_shape(width, height)


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class ProcedureStart(Start):
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    ''' Start symbol of a procedure - only shape differs from Start '''
    # Define reserved keywords for the syntax highlighter
    blackbold = SDL_BLACKBOLD
    redbold = SDL_REDBOLD
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    common_name = 'proc_start'
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    def set_shape(self, width, height):
        ''' Compute the polygon to fit in width, height '''
        path = QPainterPath()
        path.addRoundedRect(0, 0, width, height, height / 2, height / 2)
        path.moveTo(min(width / 2, height / 2), 0)
        path.lineTo(min(width / 2, height / 2), height)
        path.moveTo(max(width / 2, width - height / 2), 0)
        path.lineTo(max(width / 2, width - height / 2), height)
        self.setPath(path)
        super(Start, self).set_shape(width, height)
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class StateStart(Start):
    ''' Composite states can have several named START symbols '''
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    has_text_area = True
    is_singleton = False
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    common_name = 'state_start'
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    def __unicode__(self):
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        ''' Return the state entry point '''
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        return unicode(self.text)