[orca] Speak "-" as "minus" when used as an operator in MathML content

[Joanmarie Diggs <joanied src gnome org>]

commit a7742e160de1dbf404bbc592abe3fa0408140560
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Fri Jul 3 14:54:57 2015 -0400

    Speak "-" as "minus" when used as an operator in MathML content

 src/orca/chnames.py     |   12 ++++++++++--
 src/orca/mathsymbols.py |    4 ++++
 2 files changed, 14 insertions(+), 2 deletions(-)
---
diff --git a/src/orca/chnames.py b/src/orca/chnames.py
index 57df0e1..230112e 100644
--- a/src/orca/chnames.py
+++ b/src/orca/chnames.py
@@ -28,6 +28,7 @@ __copyright__ = "Copyright (c) 2005-2008 Sun Microsystems Inc."
 __license__   = "LGPL"
 
 from . import mathsymbols
+from . import orca_state
 from .orca_i18n import _
 
 # chnames is a dictionary where the keys represent a unicode character
@@ -806,7 +807,14 @@ def getCharacterName(character):
     """
 
     mathName = mathsymbols.getCharacterName(character)
-    if mathName:
+    charName = chnames.get(character)
+    if not (charName or mathName):
+        return character
+    if mathName and not charName:
+        return mathName
+    if charName and not mathName:
+        return charName
+    if orca_state.activeScript and orca_state.activeScript.utilities.isInMath():
         return mathName
 
-    return chnames.get(character, character)
+    return charName
diff --git a/src/orca/mathsymbols.py b/src/orca/mathsymbols.py
index dc0f633..db480ab 100644
--- a/src/orca/mathsymbols.py
+++ b/src/orca/mathsymbols.py
@@ -1260,6 +1260,10 @@ _arrows['\u2794'] = _("right-pointing arrow")
 # Translators: this is the spoken representation for the character '➢' (U+27a2)
 _arrows['\u27a2'] = _("right-pointing arrowhead")
 
+# Translators: this is the spoken word for the character '-' (U+002d) when used
+# as a MathML operator.
+_operators["\u002d"] = C_('math symbol', 'minus')
+
 # Translators: this is the spoken representation for the character '∀' (U+2200)
 _operators['\u2200'] = C_('math symbol', 'for all')