* ftplib.py: added abort() command (sends oob data).

gvanrossum · gvanrossum · commit d316607732aa · 1993-05-24T14:16:22.000Z
* Several modules: change "class C(): ..." to "class C: ...".
* flp.py: support for frozen forms.
* Added string.find() which is like index but returns -1 if not found
diff --git a/Lib/aifc.py b/Lib/aifc.py
@@ -281,7 +281,7 @@ def _write_float(f, x):
 	_write_long(f, himant)
 	_write_long(f, lomant)
 
-class Chunk():
+class Chunk:
 	def init(self, file):
 		self.file = file
 		self.chunkname = self.file.read(4)
@@ -322,7 +322,7 @@ def skip(self):
 		if self.chunksize & 1:
 			dummy = self.read(1)
 
-class Aifc_read():
+class Aifc_read:
 	# Variables used in this class:
 	#
 	# These variables are available to the user though appropriate
@@ -568,7 +568,7 @@ def _readmark(self, chunk):
 			name = _read_string(chunk)
 			self._markers.append((id, pos, name))
 
-class Aifc_write():
+class Aifc_write:
 	# Variables used in this class:
 	#
 	# These variables are user settable through appropriate methods
diff --git a/Lib/ftplib.py b/Lib/ftplib.py
@@ -32,6 +32,10 @@
 import string
 
 
+# Magic number from <socket.h>
+MSG_OOB = 0x1				# Process data out of band
+
+
 # The standard FTP server control port
 FTP_PORT = 21
 
@@ -53,6 +57,10 @@
 CRLF = '\r\n'
 
 
+# Telnet special characters
+DM = chr(242)				# Data Mark
+IP = chr(244)				# Interrupt Process
+
 # Next port to be used by makeport(), with PORT_OFFSET added
 # (This is now only used when the python interpreter doesn't support
 # the getsockname() method yet)
@@ -152,6 +160,18 @@ def voidresp(self):
 		if resp[0] <> '2':
 			raise error_reply, resp
 
+	# Abort a file transfer.  Uses out-of-band data.
+	# This does not follow the procedure from the RFC to send Telnet
+	# IP and Synch; that doesn't seem to work with the servers I've
+	# tried.  Instead, just send the ABOR command as OOB data.
+	def abort(self):
+		line = 'ABOR' + CRLF
+		if self.debugging > 1: print '*put urgent*', `line`
+		self.sock.send(line, MSG_OOB)
+		resp = self.getmultiline()
+		if resp[:3] not in ('426', '226'):
+			raise error_proto, resp
+
 	# Send a command and return the response
 	def sendcmd(self, cmd):
 		self.putcmd(cmd)
diff --git a/Lib/irix5/cddb.py b/Lib/irix5/cddb.py
@@ -25,7 +25,7 @@ def _dbid(v):
 	else:
 		return _dbid_map[v]
 
-class Cddb():
+class Cddb:
 	def init(self, tracklist):
 		self.artist = ''
 		self.title = ''
diff --git a/Lib/irix5/cdplayer.py b/Lib/irix5/cdplayer.py
@@ -16,7 +16,7 @@
 
 cdplayerrc = '.cdplayerrc'
 
-class Cdplayer():
+class Cdplayer:
 	def init(self, tracklist):
 		import string
 		self.artist = ''
diff --git a/Lib/irix5/flp.py b/Lib/irix5/flp.py
@@ -59,7 +59,11 @@ def parse_forms(filename):
 # Internal: see if a cached version of the file exists
 #
 MAGIC = '.fdc'
+_internal_cache = {}			# Used by frozen scripts only
 def checkcache(filename):
+    if _internal_cache.has_key(filename):
+	altforms = _internal_cache[filename]
+	return _unpack_cache(altforms)
     import marshal
     fp, filename = _open_formfile2(filename)
     fp.close()
@@ -80,6 +84,11 @@ def checkcache(filename):
 	    return None
 	#print 'flp: valid cache file', cachename
 	altforms = marshal.load(fp)
+	return _unpack_cache(altforms)
+    finally:
+	fp.close()
+
+def _unpack_cache(altforms):
 	forms = {}
 	for name in altforms.keys():
 	    altobj, altlist = altforms[name]
@@ -92,8 +101,6 @@ def checkcache(filename):
 		list.append(nobj)
 	    forms[name] = obj, list
 	return forms
-    finally:
-	fp.close()
 
 def rdlong(fp):
     s = fp.read(4)
@@ -128,19 +135,41 @@ def writecache(filename, forms):
 	return # Never mind
     fp.write('\0\0\0\0') # Seek back and write MAGIC when done
     wrlong(fp, getmtime(filename))
+    altforms = _pack_cache(forms)
+    marshal.dump(altforms, fp)
+    fp.seek(0)
+    fp.write(MAGIC)
+    fp.close()
+    #print 'flp: wrote cache file', cachename
+
+#
+# External: print some statements that set up the internal cache.
+# This is for use with the "freeze" script.  You should call
+# flp.freeze(filename) for all forms used by the script, and collect
+# the output on a file in a module file named "frozenforms.py".  Then
+# in the main program of the script import frozenforms.
+# (Don't forget to take this out when using the unfrozen version of
+# the script!)
+#
+def freeze(filename):
+    forms = parse_forms(filename)
+    altforms = _pack_cache(forms)
+    print 'import flp'
+    print 'flp._internal_cache[', `filename`, '] =', altforms
+
+#
+# Internal: create the data structure to be placed in the cache
+#
+def _pack_cache(forms):
     altforms = {}
     for name in forms.keys():
 	obj, list = forms[name]
 	altobj = obj.__dict__
 	altlist = []
 	for obj in list: altlist.append(obj.__dict__)
 	altforms[name] = altobj, altlist
-    marshal.dump(altforms, fp)
-    fp.seek(0)
-    fp.write(MAGIC)
-    fp.close()
-    #print 'flp: wrote cache file', cachename
-    
+    return altforms
+
 #
 # Internal: Locate form file (using PYTHONPATH) and open file
 #
diff --git a/Lib/irix5/readcd.py b/Lib/irix5/readcd.py
@@ -21,7 +21,7 @@ def _dopnum(self, cb_type, data):
 	if func:
 		func(arg, cb_type, data)
 
-class Readcd():
+class Readcd:
 	def init(self, *arg):
 		if len(arg) == 0:
 			self.player = cd.open()
diff --git a/Lib/persist.py b/Lib/persist.py
@@ -170,14 +170,14 @@ def dumptype(x, typedict, types, stack):
 		print 'def some_function(): pass'
 		print FN, '[', `uid`, '] = type(some_function)'
 	elif x == type(some_class):
-		print 'class some_class(): pass'
+		print 'class some_class: pass'
 		print FN, '[', `uid`, '] = type(some_class)'
 	elif x == type(some_instance):
-		print 'class another_class(): pass'
+		print 'class another_class: pass'
 		print 'some_instance = another_class()'
 		print FN, '[', `uid`, '] = type(some_instance)'
 	elif x == type(some_instance.method):
-		print 'class yet_another_class():'
+		print 'class yet_another_class:'
 		print '    def method(): pass'
 		print 'another_instance = yet_another_class()'
 		print FN, '[', `uid`, '] = type(another_instance.method)'
diff --git a/Lib/plat-irix5/cddb.py b/Lib/plat-irix5/cddb.py
@@ -25,7 +25,7 @@ def _dbid(v):
 	else:
 		return _dbid_map[v]
 
-class Cddb():
+class Cddb:
 	def init(self, tracklist):
 		self.artist = ''
 		self.title = ''
diff --git a/Lib/plat-irix5/cdplayer.py b/Lib/plat-irix5/cdplayer.py
@@ -16,7 +16,7 @@
 
 cdplayerrc = '.cdplayerrc'
 
-class Cdplayer():
+class Cdplayer:
 	def init(self, tracklist):
 		import string
 		self.artist = ''
diff --git a/Lib/plat-irix5/flp.py b/Lib/plat-irix5/flp.py
@@ -59,7 +59,11 @@ def parse_forms(filename):
 # Internal: see if a cached version of the file exists
 #
 MAGIC = '.fdc'
+_internal_cache = {}			# Used by frozen scripts only
 def checkcache(filename):
+    if _internal_cache.has_key(filename):
+	altforms = _internal_cache[filename]
+	return _unpack_cache(altforms)
     import marshal
     fp, filename = _open_formfile2(filename)
     fp.close()
@@ -80,6 +84,11 @@ def checkcache(filename):
 	    return None
 	#print 'flp: valid cache file', cachename
 	altforms = marshal.load(fp)
+	return _unpack_cache(altforms)
+    finally:
+	fp.close()
+
+def _unpack_cache(altforms):
 	forms = {}
 	for name in altforms.keys():
 	    altobj, altlist = altforms[name]
@@ -92,8 +101,6 @@ def checkcache(filename):
 		list.append(nobj)
 	    forms[name] = obj, list
 	return forms
-    finally:
-	fp.close()
 
 def rdlong(fp):
     s = fp.read(4)
@@ -128,19 +135,41 @@ def writecache(filename, forms):
 	return # Never mind
     fp.write('\0\0\0\0') # Seek back and write MAGIC when done
     wrlong(fp, getmtime(filename))
+    altforms = _pack_cache(forms)
+    marshal.dump(altforms, fp)
+    fp.seek(0)
+    fp.write(MAGIC)
+    fp.close()
+    #print 'flp: wrote cache file', cachename
+
+#
+# External: print some statements that set up the internal cache.
+# This is for use with the "freeze" script.  You should call
+# flp.freeze(filename) for all forms used by the script, and collect
+# the output on a file in a module file named "frozenforms.py".  Then
+# in the main program of the script import frozenforms.
+# (Don't forget to take this out when using the unfrozen version of
+# the script!)
+#
+def freeze(filename):
+    forms = parse_forms(filename)
+    altforms = _pack_cache(forms)
+    print 'import flp'
+    print 'flp._internal_cache[', `filename`, '] =', altforms
+
+#
+# Internal: create the data structure to be placed in the cache
+#
+def _pack_cache(forms):
     altforms = {}
     for name in forms.keys():
 	obj, list = forms[name]
 	altobj = obj.__dict__
 	altlist = []
 	for obj in list: altlist.append(obj.__dict__)
 	altforms[name] = altobj, altlist
-    marshal.dump(altforms, fp)
-    fp.seek(0)
-    fp.write(MAGIC)
-    fp.close()
-    #print 'flp: wrote cache file', cachename
-    
+    return altforms
+
 #
 # Internal: Locate form file (using PYTHONPATH) and open file
 #
diff --git a/Lib/plat-irix5/readcd.py b/Lib/plat-irix5/readcd.py
@@ -21,7 +21,7 @@ def _dopnum(self, cb_type, data):
 	if func:
 		func(arg, cb_type, data)
 
-class Readcd():
+class Readcd:
 	def init(self, *arg):
 		if len(arg) == 0:
 			self.player = cd.open()
diff --git a/Lib/profile.py b/Lib/profile.py
@@ -12,7 +12,7 @@
 import fpformat
 import marshal
 
-class Profile():
+class Profile:
 
 	def init(self):
 		self.timings = {}
@@ -212,7 +212,7 @@ def depth(frame):
 		frame = frame.f_back
 	return d
 
-class Stats():
+class Stats:
 	def init(self, file):
 		f = open(file, 'r')
 		self.stats = marshal.load(f)
diff --git a/Lib/string.py b/Lib/string.py
@@ -93,7 +93,7 @@ def joinfields(words, sep):
 		res = res + (sep + w)
 	return res[len(sep):]
 
-# Find substring
+# Find substring, raise exception if not found
 index_error = 'substring not found in string.index'
 def index(s, sub, *args):
 	if args:
@@ -107,7 +107,14 @@ def index(s, sub, *args):
 	while i < m:
 		if sub == s[i:i+n]: return i
 		i = i+1
-	raise index_error, (s, sub)
+	raise index_error, (s, sub) + args
+
+# Find substring, return -1 if not found
+def find(*args):
+	try:
+		return apply(index, args)
+	except index_error:
+		return -1
 
 # Convert string to integer
 atoi_error = 'non-numeric argument to string.atoi'
diff --git a/Lib/stringold.py b/Lib/stringold.py
@@ -93,7 +93,7 @@ def joinfields(words, sep):
 		res = res + (sep + w)
 	return res[len(sep):]
 
-# Find substring
+# Find substring, raise exception if not found
 index_error = 'substring not found in string.index'
 def index(s, sub, *args):
 	if args:
@@ -107,7 +107,14 @@ def index(s, sub, *args):
 	while i < m:
 		if sub == s[i:i+n]: return i
 		i = i+1
-	raise index_error, (s, sub)
+	raise index_error, (s, sub) + args
+
+# Find substring, return -1 if not found
+def find(*args):
+	try:
+		return apply(index, args)
+	except index_error:
+		return -1
 
 # Convert string to integer
 atoi_error = 'non-numeric argument to string.atoi'
diff --git a/Lib/test/test_types.py b/Lib/test/test_types.py
@@ -21,7 +21,7 @@
 if not [1]: raise TestFailed, '[1] is false instead of true'
 if not {'x': 1}: raise TestFailed, '{\'x\': 1} is false instead of true'
 def f(): pass
-class C(): pass
+class C: pass
 import sys
 x = C()
 if not f: raise TestFailed, 'f is false instead of true'
