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acss.py	3.49 KB	-rw-r--r--
bookmarks.py	8.37 KB	-rw-r--r--
braille_generator.py	21 KB	-rw-r--r--
braille.py	70.54 KB	-rw-r--r--
braille_rolenames.py	10.33 KB	-rw-r--r--
brlmon.py	6.45 KB	-rw-r--r--
brltablenames.py	7.3 KB	-rw-r--r--
caret_navigation.py	13.66 KB	-rw-r--r--
chat.py	33.71 KB	-rw-r--r--
chnames.py	23.03 KB	-rw-r--r--
cmdnames.py	55.23 KB	-rw-r--r--
colornames.py	38.13 KB	-rw-r--r--
common_keyboardmap.py	6.64 KB	-rw-r--r--
debug.py	17.79 KB	-rw-r--r--
desktop_keyboardmap.py	4.62 KB	-rw-r--r--
event_manager.py	41.45 KB	-rw-r--r--
eventsynthesizer.py	18.13 KB	-rw-r--r--
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guilabels.py	46.35 KB	-rw-r--r--
__init__.py	115 B	-rw-r--r--
input_event.py	40.29 KB	-rw-r--r--
keybindings.py	17.82 KB	-rw-r--r--
keynames.py	9.71 KB	-rw-r--r--
label_inference.py	21.29 KB	-rw-r--r--
laptop_keyboardmap.py	4.61 KB	-rw-r--r--
liveregions.py	21.77 KB	-rw-r--r--
logger.py	1.97 KB	-rw-r--r--
mathsymbols.py	88.14 KB	-rw-r--r--
messages.py	141.35 KB	-rw-r--r--
mouse_review.py	21.57 KB	-rw-r--r--
notification_messages.py	6.18 KB	-rw-r--r--
object_properties.py	33.38 KB	-rw-r--r--
orca_gtkbuilder.py	5.35 KB	-rw-r--r--
orca_gui_commandlist.py	4.19 KB	-rw-r--r--
orca_gui_find.py	8.12 KB	-rw-r--r--
orca_gui_navlist.py	6.66 KB	-rw-r--r--
orca_gui_prefs.py	139.1 KB	-rw-r--r--
orca_gui_profile.py	4.06 KB	-rw-r--r--
orca_i18n.py	3.18 KB	-rw-r--r--
orca_platform.py	1.44 KB	-rw-r--r--
orca.py	27.86 KB	-rw-r--r--
orca_state.py	2.4 KB	-rw-r--r--
phonnames.py	2.76 KB	-rw-r--r--
pronunciation_dict.py	2.61 KB	-rw-r--r--
punctuation_settings.py	13.64 KB	-rw-r--r--
script_manager.py	14.37 KB	-rw-r--r--
script.py	19.04 KB	-rw-r--r--
script_utilities.py	201.5 KB	-rw-r--r--
settings_manager.py	24.55 KB	-rw-r--r--
settings.py	12.88 KB	-rw-r--r--
sound_generator.py	11.99 KB	-rw-r--r--
sound.py	5.47 KB	-rw-r--r--
speechdispatcherfactory.py	26.19 KB	-rw-r--r--
speech_generator.py	113.82 KB	-rw-r--r--
speech.py	10.22 KB	-rw-r--r--
speechserver.py	6.92 KB	-rw-r--r--
spellcheck.py	10.07 KB	-rw-r--r--
structural_navigation.py	124.25 KB	-rw-r--r--
text_attribute_names.py	28.62 KB	-rw-r--r--
tutorialgenerator.py	30.41 KB	-rw-r--r--

Code Editor : label_inference.py

# Orca
#
# Copyright (C) 2011-2013 Igalia, S.L.
#
# Author: Joanmarie Diggs <jdiggs@igalia.com>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the
# Free Software Foundation, Inc., Franklin Street, Fifth Floor,
# Boston MA  02110-1301 USA.

"""Heuristic means to infer the functional/displayed label of a widget."""

__id__        = "$Id$"
__version__   = "$Revision$"
__date__      = "$Date$"
__copyright__ = "Copyright (C) 2011-2013 Igalia, S.L."
__license__   = "LGPL"

import pyatspi

from . import debug

class LabelInference:

def __init__(self, script):
        """Creates an instance of the LabelInference class.

Arguments:
        - script: the script with which this instance is associated.
        """

self._script = script
        self._lineCache = {}
        self._extentsCache = {}
        self._isWidgetCache = {}

def infer(self, obj, focusedOnly=True):
        """Attempt to infer the functional/displayed label of obj.

Arguments
        - obj: the unlabeled widget
        - focusedOnly: If True, only infer if the widget has focus.

Returns the text which we think is the label, or None.
        """

debug.println(debug.LEVEL_INFO, "INFER label for: %s" % obj, True)
        if not obj:
            return None, []

if focusedOnly and not obj.getState().contains(pyatspi.STATE_FOCUSED):
            debug.println(debug.LEVEL_INFO, "INFER - object not focused", True)
            return None, []

result, objects = None, []
        if not result:
            result, objects = self.inferFromTextLeft(obj)
            debug.println(debug.LEVEL_INFO, "INFER - Text Left: %s" % result, True)
        if not result or self._preferRight(obj):
            result, objects = self.inferFromTextRight(obj) or result
            debug.println(debug.LEVEL_INFO, "INFER - Text Right: %s" % result, True)
        if not result:
            result, objects = self.inferFromTable(obj)
            debug.println(debug.LEVEL_INFO, "INFER - Table: %s" % result, True)
        if not result:
            result, objects = self.inferFromTextAbove(obj)
            debug.println(debug.LEVEL_INFO, "INFER - Text Above: %s" % result, True)
        if not result:
            result, objects = self.inferFromTextBelow(obj)
            debug.println(debug.LEVEL_INFO, "INFER - Text Below: %s" % result, True)

# TODO - We probably do not wish to "infer" from these. Instead, we
        # should ensure that this content gets presented as part of the widget.
        # (i.e. the label is something on screen. Widget name and description
        # are each something other than a label.)
        if not result:
            result, objects = obj.name, []
            debug.println(debug.LEVEL_INFO, "INFER - Name: %s" % result, True)
        if result:
            result = result.strip()
            result = result.replace("\n", " ")

# Desperate times call for desperate measures....
        if not result:
            result, objects = self.inferFromTextLeft(obj, proximity=200)
            debug.println(debug.LEVEL_INFO, "INFER - Text Left with proximity of 200: %s" % result, True)

self.clearCache()
        return result, objects

def clearCache(self):
        """Dumps whatever we've stored for performance purposes."""

self._lineCache = {}
        self._extentsCache = {}
        self._isWidgetCache = {}

def _preferRight(self, obj):
        """Returns True if we should prefer text on the right, rather than the
        left, for the object obj."""

onRightRoles = [pyatspi.ROLE_CHECK_BOX, pyatspi.ROLE_RADIO_BUTTON]
        return obj.getRole() in onRightRoles

def _preventRight(self, obj):
        """Returns True if we should not permit inference based on text to
        the right for the object obj."""

roles = [pyatspi.ROLE_COMBO_BOX,
                 pyatspi.ROLE_LIST,
                 pyatspi.ROLE_LIST_BOX]

return obj.getRole() in roles

def _preferTop(self, obj):
        """Returns True if we should prefer text above, rather than below for
        the object obj."""

roles = [pyatspi.ROLE_COMBO_BOX,
                 pyatspi.ROLE_LIST,
                 pyatspi.ROLE_LIST_BOX]

return obj.getRole() in roles

def _preventBelow(self, obj):
        """Returns True if we should not permit inference based on text below
        the object obj."""

roles = [pyatspi.ROLE_ENTRY,
                 pyatspi.ROLE_PASSWORD_TEXT]

return obj.getRole() not in roles

def _isSimpleObject(self, obj):
        """Returns True if the given object has 'simple' contents, such as text
        without embedded objects or a single embedded object without text."""

if not obj:
            return False

isMatch = lambda x: x and not self._script.utilities.isStaticTextLeaf(x)

try:
            children = [child for child in obj if isMatch(child)]
        except (LookupError, RuntimeError):
            debug.println(debug.LEVEL_INFO, 'Dead Accessible in %s' % obj, True)
            return False

children = [x for x in children if x.getRole() != pyatspi.ROLE_LINK]
        if len(children) > 1:
            return False

try:
            text = obj.queryText()
        except NotImplementedError:
            return True

string = text.getText(0, -1).strip()
        if string.count(self._script.EMBEDDED_OBJECT_CHARACTER) > 1:
            return False

return True

def _cannotLabel(self, obj):
        """Returns True if the given object should not be treated as a label."""

if not obj:
            return True

nonLabelTextRoles = [pyatspi.ROLE_HEADING, pyatspi.ROLE_LIST_ITEM]
        if obj.getRole() in nonLabelTextRoles:
            return True

return self._isWidget(obj)

def _isWidget(self, obj):
        """Returns True if the given object is a widget."""

if not obj:
            return False

rv = self._isWidgetCache.get(hash(obj))
        if rv is not None:
            return rv

widgetRoles = [pyatspi.ROLE_CHECK_BOX,
                       pyatspi.ROLE_RADIO_BUTTON,
                       pyatspi.ROLE_TOGGLE_BUTTON,
                       pyatspi.ROLE_COMBO_BOX,
                       pyatspi.ROLE_LIST,
                       pyatspi.ROLE_LIST_BOX,
                       pyatspi.ROLE_MENU,
                       pyatspi.ROLE_MENU_ITEM,
                       pyatspi.ROLE_ENTRY,
                       pyatspi.ROLE_PASSWORD_TEXT,
                       pyatspi.ROLE_PUSH_BUTTON]

isWidget = obj.getRole() in widgetRoles
        if not isWidget and obj.getState().contains(pyatspi.STATE_EDITABLE):
            isWidget = True

self._isWidgetCache[hash(obj)] = isWidget
        return isWidget

def _getExtents(self, obj, startOffset=0, endOffset=-1):
        """Returns (x, y, width, height) of the text at the given offsets
        if the object implements accessible text, or just the extents of
        the object if it doesn't implement accessible text."""

if not obj:
            return 0, 0, 0, 0

rv = self._extentsCache.get((hash(obj), startOffset, endOffset))
        if rv:
            return rv

extents = 0, 0, 0, 0
        text = self._script.utilities.queryNonEmptyText(obj)
        if text:
            skipTextExtents = [pyatspi.ROLE_ENTRY, pyatspi.ROLE_PASSWORD_TEXT]
            if not obj.getRole() in skipTextExtents:
                if endOffset == -1:
                    try:
                        endOffset = text.characterCount
                    except:
                        msg = "ERROR: Exception getting character count for %s" % obj
                        debug.println(debug.LEVEL_INFO, msg, True)
                        return extents

extents = text.getRangeExtents(startOffset, endOffset, 0)

if not (extents[2] and extents[3]):
            try:
                ext = obj.queryComponent().getExtents(0)
            except NotImplementedError:
                msg = "INFO: %s does not implement the component interface" % obj
                debug.println(debug.LEVEL_INFO, msg, True)
            except:
                msg = "ERROR: Exception getting extents for %s" % obj
                debug.println(debug.LEVEL_INFO, msg, True)
            else:
                extents = ext.x, ext.y, ext.width, ext.height

self._extentsCache[(hash(obj), startOffset, endOffset)] = extents
        return extents

def _createLabelFromContents(self, obj):
        """Gets the functional label text associated with the object obj."""

if not self._isSimpleObject(obj):
            return None, []

if self._cannotLabel(obj):
            return None, []

contents = self._script.utilities.getObjectContentsAtOffset(obj, useCache=False)
        objects = [content[0] for content in contents]
        if list(filter(self._isWidget, objects)):
            return None, []

strings = [content[3] for content in contents]
        return ''.join(strings), objects

def _getLineContents(self, obj, start=0):
        """Get the (obj, startOffset, endOffset, string) tuples for the line
        containing the object, obj."""

rv = self._lineCache.get(hash(obj))
        if rv:
            return rv

key = hash(obj)
        if self._isWidget(obj):
            start, end = self._script.utilities.getHyperlinkRange(obj)
            obj = obj.parent

rv = self._script.utilities.getLineContentsAtOffset(obj, start, True, False)
        self._lineCache[key] = rv

return rv

def inferFromTextLeft(self, obj, proximity=75):
        """Attempt to infer the functional/displayed label of obj by
        looking at the contents of the current line, which are to the
        left of this object

Arguments
        - obj: the unlabeled widget
        - proximity: pixels expected for a match

Returns the text which we think is the label, or None.
        """

extents = self._getExtents(obj)
        contents = self._getLineContents(obj)
        content = [o for o in contents if o[0] == obj]
        try:
            index = contents.index(content[0])
        except IndexError:
            index = len(contents)

onLeft = contents[0:index]
        start = 0
        for i in range(len(onLeft) - 1, -1, -1):
            lObj, lStart, lEnd, lString = onLeft[i]
            lExtents = self._getExtents(lObj)
            if lExtents[0] > extents[0] or self._cannotLabel(lObj):
                start = i + 1
                break

onLeft = onLeft[start:]
        if not (onLeft and onLeft[0]):
            return None, []

lObj, start, end, string = onLeft[-1]
        lExtents = self._getExtents(lObj, start, end)
        distance = extents[0] - (lExtents[0] + lExtents[2])
        if 0 <= distance <= proximity:
            strings = [content[3] for content in onLeft]
            result = ''.join(strings).strip()
            if result:
                return result, [content[0] for content in onLeft]

return None, []

def inferFromTextRight(self, obj, proximity=25):
        """Attempt to infer the functional/displayed label of obj by
        looking at the contents of the current line, which are to the
        right of this object

Arguments
        - obj: the unlabeled widget
        - proximity: pixels expected for a match

Returns the text which we think is the label, or None.
        """

if self._preventRight(obj):
            return None, []

onRight = contents[min(len(contents), index+1):]
        end = len(onRight)
        for i, item in enumerate(onRight):
            if self._cannotLabel(item[0]):
                if not self._preferRight(obj):
                    return None, []
                end = i + 1
                break

onRight = onRight[0:end]
        if not (onRight and onRight[0]):
            return None, []

rObj, start, end, string = onRight[0]
        rExtents = self._getExtents(rObj, start, end)
        distance = rExtents[0] - (extents[0] + extents[2])
        if distance <= proximity or self._preferRight(obj):
            strings = [content[3] for content in onRight]
            result = ''.join(strings).strip()
            if result:
                return result, [content[0] for content in onRight]

return None, []

def inferFromTextAbove(self, obj, proximity=20):
        """Attempt to infer the functional/displayed label of obj by
        looking at the contents of the line above the line containing
        the object obj.

Arguments
        - obj: the unlabeled widget
        - proximity: pixels expected for a match

Returns the text which we think is the label, or None.
        """

thisLine = self._getLineContents(obj)
        content = [o for o in thisLine if o[0] == obj]
        try:
            index = thisLine.index(content[0])
        except IndexError:
            return None, []
        if index > 0:
            return None, []

prevObj, prevOffset = self._script.utilities.previousContext(
            thisLine[0][0], thisLine[0][1], True)
        prevLine = self._getLineContents(prevObj, prevOffset)
        if len(prevLine) != 1:
            return None, []

prevObj, start, end, string = prevLine[0]
        if self._cannotLabel(prevObj):
            return None, []

if string.strip():
            x, y, width, height = self._getExtents(prevObj, start, end)
            objX, objY, objWidth, objHeight = self._getExtents(obj)
            distance = objY - (y + height)
            if 0 <= distance <= proximity and x <= objX:
                return string.strip(), [prevObj]

return None, []

def inferFromTextBelow(self, obj, proximity=20):
        """Attempt to infer the functional/displayed label of obj by
        looking at the contents of the line above the line containing
        the object obj.

Arguments
        - obj: the unlabeled widget
        - proximity: pixels expected for a match

Returns the text which we think is the label, or None.
        """

if self._preventBelow(obj):
            return None, []

nextObj, nextOffset = self._script.utilities.nextContext(
            thisLine[-1][0], thisLine[-1][2] - 1, True)
        nextLine = self._getLineContents(nextObj, nextOffset)
        if len(nextLine) != 1:
            return None, []

nextObj, start, end, string = nextLine[0]
        if self._cannotLabel(nextObj):
            return None, []

if string.strip():
            x, y, width, height = self._getExtents(nextObj, start, end)
            objX, objY, objWidth, objHeight = self._getExtents(obj)
            distance = y - (objY + objHeight)
            if 0 <= distance <= proximity:
                return string.strip(), [nextObj]

return None, []

def _isTable(self, obj):
        if not obj:
            return False

if obj.getRole() == pyatspi.ROLE_TABLE:
            return True

return self._getTag(obj) == 'table'

def _isRow(self, obj):
        if not obj:
            return False

if obj.getRole() == pyatspi.ROLE_TABLE_ROW:
            return True

return self._getTag(obj) == 'tr'

def _isCell(self, obj):
        if not obj:
            return False

if obj.getRole() == pyatspi.ROLE_TABLE_CELL:
            return True

return self._getTag(obj) in ['td', 'th']

def _getCellFromTable(self, table, rowindex, colindex):
        if "Table" not in pyatspi.listInterfaces(table):
            return NOne

if rowindex < 0 or colindex < 0:
            return None

iface = table.queryTable()
        if rowindex >= iface.nRows or colindex >= iface.nColumns:
            return None

return table.queryTable().getAccessibleAt(rowindex, colindex)

def _getCellFromRow(self, row, colindex):
        if 0 <= colindex < row.childCount:
            return row[colindex]

return None

def _getTag(self, obj):
        attrs = self._script.utilities.objectAttributes(obj)
        return attrs.get('tag')

def inferFromTable(self, obj, proximityForRight=50):
        """Attempt to infer the functional/displayed label of obj by looking
        at the contents of the surrounding table cells. Note that this approach
        assumes a simple table in which the widget is the sole occupant of its
        cell.

Arguments
        - obj: the unlabeled widget

Returns the text which we think is the label, or None.
        """

cell = pyatspi.findAncestor(obj, self._isCell)
        if not self._isSimpleObject(cell):
            return None, []

if not cell in [obj.parent, obj.parent.parent]:
            return None, []

grid = pyatspi.findAncestor(cell, self._isTable)
        if not grid:
            return None, []

cellLeft = cellRight = cellAbove = cellBelow = None
        gridrow = pyatspi.findAncestor(cell, self._isRow)
        rowindex, colindex = self._script.utilities.coordinatesForCell(cell)
        if colindex > -1:
            cellLeft = self._getCellFromTable(grid, rowindex, colindex - 1)
            cellRight = self._getCellFromTable(grid, rowindex, colindex + 1)
            cellAbove = self._getCellFromTable(grid, rowindex - 1, colindex)
            cellBelow = self._getCellFromTable(grid, rowindex + 1, colindex)
        elif gridrow and cell.parent == gridrow:
            cellindex = cell.getIndexInParent()
            cellLeft = self._getCellFromRow(gridrow, cellindex - 1)
            cellRight = self._getCellFromRow(gridrow, cellindex + 1)
            rowindex = gridrow.getIndexInParent()
            if rowindex > 0:
                cellAbove = self._getCellFromRow(gridrow.parent[rowindex - 1], cellindex)
            if rowindex + 1 < grid.childCount:
                cellBelow = self._getCellFromRow(gridrow.parent[rowindex + 1], cellindex)

if cellLeft and not self._preferRight(obj):
            label, sources = self._createLabelFromContents(cellLeft)
            if label:
                return label.strip(), sources

objX, objY, objWidth, objHeight = self._getExtents(obj)

if cellRight and not self._preventRight(obj):
            x, y, width, height = self._getExtents(cellRight)
            distance = x - (objX + objWidth)
            if distance <= proximityForRight or self._preferRight(obj):
                label, sources = self._createLabelFromContents(cellRight)
                if label:
                    return label.strip(), sources

labelAbove = labelBelow = None
        if cellAbove:
            labelAbove, sourcesAbove = self._createLabelFromContents(cellAbove)
            if labelAbove and self._preferTop(obj):
                return labelAbove.strip(), sourcesAbove

if cellBelow and not self._preventBelow(obj):
            labelBelow, sourcesBelow = self._createLabelFromContents(cellBelow)

if labelAbove and labelBelow:
            aboveX, aboveY, aboveWidth, aboveHeight = self._getExtents(cellAbove)
            belowX, belowY, belowWidth, belowHeight = self._getExtents(cellBelow)
            dAbove = objY - (aboveY + aboveHeight)
            dBelow = belowY - (objY + objHeight)
            if dAbove <= dBelow:
                return labelAbove.strip(), sourcesAbove
            return labelBelow.strip(), sourcesBelow

if labelAbove:
            return labelAbove.strip(), sourcesAbove
        if labelBelow:
            return labelBelow.strip(), sourcesBelow

# None of the cells immediately surrounding this cell seem to be serving
        # as a functional label. Therefore, see if this table looks like a grid
        # of widgets with the functional labels in the first row.

try:
            table = grid.queryTable()
        except NotImplementedError:
            return None, []

firstRow = [table.getAccessibleAt(0, i) for i in range(table.nColumns)]
        if not firstRow or list(filter(self._isWidget, firstRow)):
            return None, []

if colindex < 0:
            return None, []

cells = [table.getAccessibleAt(i, colindex) for i in range(1, table.nRows)]
        cells = [x for x in cells if x is not None]
        if [x for x in cells if x.childCount and x[0].getRole() != obj.getRole()]:
            return None, []

label, sources = self._createLabelFromContents(firstRow[colindex])
        if label:
            return label.strip(), sources

return None, []

${this.title}

Code Editor : label_inference.py