Add third_party/pexpect

third_party/pexpect/pexpect/exceptions.py

Index: third_party/pexpect/pexpect/exceptions.py
diff --git a/third_party/pexpect/pexpect/exceptions.py b/third_party/pexpect/pexpect/exceptions.py
new file mode 100644
index 0000000000000000000000000000000000000000..cb360f02614304b306714b309cbc9b0a0f2ff770
--- /dev/null
+++ b/third_party/pexpect/pexpect/exceptions.py
@@ -0,0 +1,35 @@
+"""Exception classes used by Pexpect"""
+
+import traceback
+import sys
+
+class ExceptionPexpect(Exception):
+    '''Base class for all exceptions raised by this module.
+    '''
+
+    def __init__(self, value):
+        super(ExceptionPexpect, self).__init__(value)
+        self.value = value
+
+    def __str__(self):
+        return str(self.value)
+
+    def get_trace(self):
+        '''This returns an abbreviated stack trace with lines that only concern
+        the caller. In other words, the stack trace inside the Pexpect module
+        is not included. '''
+
+        tblist = traceback.extract_tb(sys.exc_info()[2])
+        tblist = [item for item in tblist if ('pexpect/__init__' not in item[0])
+                                           and ('pexpect/expect' not in item[0])]
+        tblist = traceback.format_list(tblist)
+        return ''.join(tblist)
+
+
+class EOF(ExceptionPexpect):
+    '''Raised when EOF is read from a child.
+    This usually means the child has exited.'''
+
+
+class TIMEOUT(ExceptionPexpect):
+    '''Raised when a read time exceeds the timeout. '''