1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
# Protocol Buffers - Google's data interchange format
# Copyright 2008 Google Inc.
# http://code.google.com/p/protobuf/
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Contains routines for printing protocol messages in text format."""
__author__ = 'kenton@google.com (Kenton Varda)'
import cStringIO
from google.protobuf import descriptor
__all__ = [ 'MessageToString', 'PrintMessage', 'PrintField', 'PrintFieldValue' ]
def MessageToString(message):
out = cStringIO.StringIO()
PrintMessage(message, out)
result = out.getvalue()
out.close()
return result
def PrintMessage(message, out, indent = 0):
for field, value in message.ListFields():
if field.label == descriptor.FieldDescriptor.LABEL_REPEATED:
for element in value:
PrintField(field, element, out, indent)
else:
PrintField(field, value, out, indent)
def PrintField(field, value, out, indent = 0):
"""Print a single field name/value pair. For repeated fields, the value
should be a single element."""
out.write(' ' * indent);
if field.is_extension:
out.write('[')
if (field.containing_type.GetOptions().message_set_wire_format and
field.type == descriptor.FieldDescriptor.TYPE_MESSAGE and
field.message_type == field.extension_scope and
field.label == descriptor.FieldDescriptor.LABEL_OPTIONAL):
out.write(field.message_type.full_name)
else:
out.write(field.full_name)
out.write(']')
elif field.type == descriptor.FieldDescriptor.TYPE_GROUP:
# For groups, use the capitalized name.
out.write(field.message_type.name)
else:
out.write(field.name)
if field.cpp_type != descriptor.FieldDescriptor.CPPTYPE_MESSAGE:
# The colon is optional in this case, but our cross-language golden files
# don't include it.
out.write(': ')
PrintFieldValue(field, value, out, indent)
out.write('\n')
def PrintFieldValue(field, value, out, indent = 0):
"""Print a single field value (not including name). For repeated fields,
the value should be a single element."""
if field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE:
out.write(' {\n')
PrintMessage(value, out, indent + 2)
out.write(' ' * indent + '}')
elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_ENUM:
out.write(field.enum_type.values_by_number[value].name)
elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_STRING:
out.write('\"')
out.write(_CEscape(value))
out.write('\"')
elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_BOOL:
if value:
out.write("true")
else:
out.write("false")
else:
out.write(str(value))
# text.encode('string_escape') does not seem to satisfy our needs as it
# encodes unprintable characters using two-digit hex escapes whereas our
# C++ unescaping function allows hex escapes to be any length. So,
# "\0011".encode('string_escape') ends up being "\\x011", which will be
# decoded in C++ as a single-character string with char code 0x11.
def _CEscape(text):
def escape(c):
o = ord(c)
if o == 10: return r"\n" # optional escape
if o == 13: return r"\r" # optional escape
if o == 9: return r"\t" # optional escape
if o == 39: return r"\'" # optional escape
if o == 34: return r'\"' # necessary escape
if o == 92: return r"\\" # necessary escape
if o >= 127 or o < 32: return "\\%03o" % o # necessary escapes
return c
return "".join([escape(c) for c in text])
|
