[orca] Further fix for bgo#581352 - Remove brl module

[William Walker <wwalker src gnome org>]

commit 28ed6cad5ce8f0c7a9a2ccef1aa90127014a335d
Author: Willie Walker <william walker sun com>
Date:   Sun Jun 7 05:05:24 2009 -0400

    Further fix for bgo#581352 - Remove brl module
    
    This allows Orca to run even if brlapi is not available on the machine
---
 src/orca/braille.py |  151 ++++++++++++++++++++++++++-------------------------
 src/orca/default.py |   54 ++++++++++---------
 2 files changed, 106 insertions(+), 99 deletions(-)

diff --git a/src/orca/braille.py b/src/orca/braille.py
index 193622e..dc1fff3 100644
--- a/src/orca/braille.py
+++ b/src/orca/braille.py
@@ -49,9 +49,11 @@ try:
     import gobject
 
     _brlAPI = None
+    _brlAPIAvailable = True
     _brlAPIRunning = False
     _brlAPISourceId = 0
 except:
+    _brlAPIAvailable = False
     _brlAPIRunning = False
 
 try:
@@ -83,89 +85,90 @@ monitor = None
 #
 command_name = {}
 
-# Translators: this is a command for a button on a refreshable braille
-# display (an external hardware device used by people who are blind).
-# When pressing the button, the display scrolls to the left.
-#
-command_name[brlapi.KEY_CMD_FWINLT]   = _("Line Left")
+if _brlAPIAvailable:
+    # Translators: this is a command for a button on a refreshable braille
+    # display (an external hardware device used by people who are blind).
+    # When pressing the button, the display scrolls to the left.
+    #
+    command_name[brlapi.KEY_CMD_FWINLT]   = _("Line Left")
 
-# Translators: this is a command for a button on a refreshable braille
-# display (an external hardware device used by people who are blind).
-# When pressing the button, the display scrolls to the right.
-#
-command_name[brlapi.KEY_CMD_FWINRT]   = _("Line Right")
+    # Translators: this is a command for a button on a refreshable braille
+    # display (an external hardware device used by people who are blind).
+    # When pressing the button, the display scrolls to the right.
+    #
+    command_name[brlapi.KEY_CMD_FWINRT]   = _("Line Right")
 
-# Translators: this is a command for a button on a refreshable braille
-# display (an external hardware device used by people who are blind).
-# When pressing the button, the display scrolls up.
-#
-command_name[brlapi.KEY_CMD_LNUP]     = _("Line Up")
+    # Translators: this is a command for a button on a refreshable braille
+    # display (an external hardware device used by people who are blind).
+    # When pressing the button, the display scrolls up.
+    #
+    command_name[brlapi.KEY_CMD_LNUP]     = _("Line Up")
 
-# Translators: this is a command for a button on a refreshable braille
-# display (an external hardware device used by people who are blind).
-# When pressing the button, the display scrolls down.
-#
-command_name[brlapi.KEY_CMD_LNDN]     = _("Line Down")
+    # Translators: this is a command for a button on a refreshable braille
+    # display (an external hardware device used by people who are blind).
+    # When pressing the button, the display scrolls down.
+    #
+    command_name[brlapi.KEY_CMD_LNDN]     = _("Line Down")
 
-# Translators: this is a command for a button on a refreshable braille
-# display (an external hardware device used by people who are blind).
-# When pressing the button, it instructs the braille display to freeze.
-#
-command_name[brlapi.KEY_CMD_FREEZE]     = _("Freeze")
+    # Translators: this is a command for a button on a refreshable braille
+    # display (an external hardware device used by people who are blind).
+    # When pressing the button, it instructs the braille display to freeze.
+    #
+    command_name[brlapi.KEY_CMD_FREEZE]     = _("Freeze")
 
-# Translators: this is a command for a button on a refreshable braille
-# display (an external hardware device used by people who are blind).
-# When pressing the button, the display scrolls to the top left of the
-# window.
-#
-command_name[brlapi.KEY_CMD_TOP_LEFT] = _("Top Left")
+    # Translators: this is a command for a button on a refreshable braille
+    # display (an external hardware device used by people who are blind).
+    # When pressing the button, the display scrolls to the top left of the
+    # window.
+    #
+    command_name[brlapi.KEY_CMD_TOP_LEFT] = _("Top Left")
 
-# Translators: this is a command for a button on a refreshable braille
-# display (an external hardware device used by people who are blind).
-# When pressing the button, the display scrolls to the bottom right of
-# the window.
-#
-command_name[brlapi.KEY_CMD_BOT_LEFT] = _("Bottom Right")
+    # Translators: this is a command for a button on a refreshable braille
+    # display (an external hardware device used by people who are blind).
+    # When pressing the button, the display scrolls to the bottom right of
+    # the window.
+    #
+    command_name[brlapi.KEY_CMD_BOT_LEFT] = _("Bottom Right")
 
-# Translators: this is a command for a button on a refreshable braille
-# display (an external hardware device used by people who are blind).
-# When pressing the button, the display scrolls to position containing
-# the cursor.
-#
-command_name[brlapi.KEY_CMD_HOME]     = _("Cursor Position")
+    # Translators: this is a command for a button on a refreshable braille
+    # display (an external hardware device used by people who are blind).
+    # When pressing the button, the display scrolls to position containing
+    # the cursor.
+    #
+    command_name[brlapi.KEY_CMD_HOME]     = _("Cursor Position")
 
-# Translators: this is a command for a button on a refreshable braille
-# display (an external hardware device used by people who are blind).
-# When pressing the button, the display toggles between contracted and
-# contracted braille.
-#
-command_name[brlapi.KEY_CMD_SIXDOTS]  = _("Six Dots")
+    # Translators: this is a command for a button on a refreshable braille
+    # display (an external hardware device used by people who are blind).
+    # When pressing the button, the display toggles between contracted and
+    # contracted braille.
+    #
+    command_name[brlapi.KEY_CMD_SIXDOTS]  = _("Six Dots")
 
-# Translators: this is a command for a button on a refreshable braille
-# display (an external hardware device used by people who are blind).
-# This command represents a whole set of buttons known as cursor
-# routings keys and are a way for a user to tell the machine they are
-# interested in a particular character on the display.
-#
-command_name[brlapi.KEY_CMD_ROUTE]    = _("Cursor Routing")
-
-# Translators: this is a command for a button on a refreshable braille
-# display (an external hardware device used by people who are blind).
-# This command represents the start of a selection operation.  It is
-# called "Cut Begin" to map to what BrlTTY users are used to:  in
-# character cell mode operation on virtual consoles, the act of copying
-# text is erroneously called a "cut" operation.
-#
-command_name[brlapi.KEY_CMD_CUTBEGIN] = _("Cut Begin")
-
-# Translators: this is a command for a button on a refreshable braille
-# display (an external hardware device used by people who are blind).
-# This command represents marking the endpoint of a selection.  It is
-# called "Cut Line" to map to what BrlTTY users are used to:  in
-# character cell mode operation on virtual consoles, the act of copying
-# text is erroneously called a "cut" operation.
-#
-command_name[brlapi.KEY_CMD_CUTLINE] = _("Cut Line")
+    # Translators: this is a command for a button on a refreshable braille
+    # display (an external hardware device used by people who are blind).
+    # This command represents a whole set of buttons known as cursor
+    # routings keys and are a way for a user to tell the machine they are
+    # interested in a particular character on the display.
+    #
+    command_name[brlapi.KEY_CMD_ROUTE]    = _("Cursor Routing")
+
+    # Translators: this is a command for a button on a refreshable braille
+    # display (an external hardware device used by people who are blind).
+    # This command represents the start of a selection operation.  It is
+    # called "Cut Begin" to map to what BrlTTY users are used to:  in
+    # character cell mode operation on virtual consoles, the act of copying
+    # text is erroneously called a "cut" operation.
+    #
+    command_name[brlapi.KEY_CMD_CUTBEGIN] = _("Cut Begin")
+
+    # Translators: this is a command for a button on a refreshable braille
+    # display (an external hardware device used by people who are blind).
+    # This command represents marking the endpoint of a selection.  It is
+    # called "Cut Line" to map to what BrlTTY users are used to:  in
+    # character cell mode operation on virtual consoles, the act of copying
+    # text is erroneously called a "cut" operation.
+    #
+    command_name[brlapi.KEY_CMD_CUTLINE] = _("Cut Line")
 
 # The size of the physical display (width, height).  The coordinate system of
 # the display is set such that the upper left is (0,0), x values increase from
diff --git a/src/orca/default.py b/src/orca/default.py
index a1c4e3e..9eb81a7 100644
--- a/src/orca/default.py
+++ b/src/orca/default.py
@@ -1957,31 +1957,35 @@ class Script(script.Script):
         values are InputEventHandler instances.
         """
         brailleBindings = script.Script.getBrailleBindings(self)
-        brailleBindings[braille.brlapi.KEY_CMD_FWINLT]   = \
-            self.inputEventHandlers["panBrailleLeftHandler"]
-        brailleBindings[braille.brlapi.KEY_CMD_FWINRT]   = \
-            self.inputEventHandlers["panBrailleRightHandler"]
-        brailleBindings[braille.brlapi.KEY_CMD_LNUP]     = \
-            self.inputEventHandlers["reviewAboveHandler"]
-        brailleBindings[braille.brlapi.KEY_CMD_LNDN]     = \
-            self.inputEventHandlers["reviewBelowHandler"]
-        brailleBindings[braille.brlapi.KEY_CMD_FREEZE]   = \
-            self.inputEventHandlers["toggleFlatReviewModeHandler"]
-        brailleBindings[braille.brlapi.KEY_CMD_TOP_LEFT] = \
-            self.inputEventHandlers["reviewHomeHandler"]
-        brailleBindings[braille.brlapi.KEY_CMD_BOT_LEFT] = \
-            self.inputEventHandlers["reviewBottomLeftHandler"]
-        brailleBindings[braille.brlapi.KEY_CMD_HOME]     = \
-            self.inputEventHandlers["goBrailleHomeHandler"]
-        brailleBindings[braille.brlapi.KEY_CMD_SIXDOTS]   = \
-            self.inputEventHandlers["contractedBrailleHandler"]
-        brailleBindings[braille.brlapi.KEY_CMD_ROUTE]   = \
-            self.inputEventHandlers["processRoutingKeyHandler"]
-        brailleBindings[braille.brlapi.KEY_CMD_CUTBEGIN] = \
-            self.inputEventHandlers["processBrailleCutBeginHandler"]
-        brailleBindings[braille.brlapi.KEY_CMD_CUTLINE] = \
-            self.inputEventHandlers["processBrailleCutLineHandler"]
-
+        try:
+            brailleBindings[braille.brlapi.KEY_CMD_FWINLT]   = \
+                self.inputEventHandlers["panBrailleLeftHandler"]
+            brailleBindings[braille.brlapi.KEY_CMD_FWINRT]   = \
+                self.inputEventHandlers["panBrailleRightHandler"]
+            brailleBindings[braille.brlapi.KEY_CMD_LNUP]     = \
+                self.inputEventHandlers["reviewAboveHandler"]
+            brailleBindings[braille.brlapi.KEY_CMD_LNDN]     = \
+                self.inputEventHandlers["reviewBelowHandler"]
+            brailleBindings[braille.brlapi.KEY_CMD_FREEZE]   = \
+                self.inputEventHandlers["toggleFlatReviewModeHandler"]
+            brailleBindings[braille.brlapi.KEY_CMD_TOP_LEFT] = \
+                self.inputEventHandlers["reviewHomeHandler"]
+            brailleBindings[braille.brlapi.KEY_CMD_BOT_LEFT] = \
+                self.inputEventHandlers["reviewBottomLeftHandler"]
+            brailleBindings[braille.brlapi.KEY_CMD_HOME]     = \
+                self.inputEventHandlers["goBrailleHomeHandler"]
+            brailleBindings[braille.brlapi.KEY_CMD_SIXDOTS]   = \
+                self.inputEventHandlers["contractedBrailleHandler"]
+            brailleBindings[braille.brlapi.KEY_CMD_ROUTE]   = \
+                self.inputEventHandlers["processRoutingKeyHandler"]
+            brailleBindings[braille.brlapi.KEY_CMD_CUTBEGIN] = \
+                self.inputEventHandlers["processBrailleCutBeginHandler"]
+            brailleBindings[braille.brlapi.KEY_CMD_CUTLINE] = \
+                self.inputEventHandlers["processBrailleCutLineHandler"]
+        except:
+            debug.println(debug.LEVEL_CONFIGURATION,
+                          "WARNING: braille bindings unavailable:")
+            debug.printException(debug.LEVEL_CONFIGURATION)
         return brailleBindings
 
     def processKeyboardEvent(self, keyboardEvent):