Revert "third_party/protobuf: Update to HEAD (83d681ee2c)"

third_party/protobuf/python/google/protobuf/json_format.py

 # Protocol Buffers - Google's data interchange format
 # Copyright 2008 Google Inc.  All rights reserved.
 # https://developers.google.com/protocol-buffers/
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
@@ skipping 24 matching lines @@
   # Create a proto object and serialize it to a json format string.
   message = my_proto_pb2.MyMessage(foo='bar')
   json_string = json_format.MessageToJson(message)
 
   # Parse a json format string to proto object.
   message = json_format.Parse(json_string, my_proto_pb2.MyMessage())
 """
 
 __author__ = 'jieluo@google.com (Jie Luo)'
 
-try:
-  from collections import OrderedDict
-except ImportError:
-  from ordereddict import OrderedDict  #PY26
 import base64
 import json
 import math
-import re
 import six
 import sys
 
-from operator import methodcaller
 from google.protobuf import descriptor
 from google.protobuf import symbol_database
 
 _TIMESTAMPFOMAT = '%Y-%m-%dT%H:%M:%S'
 _INT_TYPES = frozenset([descriptor.FieldDescriptor.CPPTYPE_INT32,
                         descriptor.FieldDescriptor.CPPTYPE_UINT32,
                         descriptor.FieldDescriptor.CPPTYPE_INT64,
                         descriptor.FieldDescriptor.CPPTYPE_UINT64])
 _INT64_TYPES = frozenset([descriptor.FieldDescriptor.CPPTYPE_INT64,
                           descriptor.FieldDescriptor.CPPTYPE_UINT64])
 _FLOAT_TYPES = frozenset([descriptor.FieldDescriptor.CPPTYPE_FLOAT,
                           descriptor.FieldDescriptor.CPPTYPE_DOUBLE])
 _INFINITY = 'Infinity'
 _NEG_INFINITY = '-Infinity'
 _NAN = 'NaN'
 
-_UNPAIRED_SURROGATE_PATTERN = re.compile(six.u(
-    r'[\ud800-\udbff](?![\udc00-\udfff])|(?<![\ud800-\udbff])[\udc00-\udfff]'
-))
 
 class Error(Exception):
   """Top-level module error for json_format."""
 
 
 class SerializeToJsonError(Error):
   """Thrown if serialization to JSON fails."""
 
 
 class ParseError(Error):
   """Thrown in case of parsing error."""
 
 
-def MessageToJson(message,
-                  including_default_value_fields=False,
-                  preserving_proto_field_name=False):
+def MessageToJson(message, including_default_value_fields=False):
   """Converts protobuf message to JSON format.
 
   Args:
     message: The protocol buffers message instance to serialize.
     including_default_value_fields: If True, singular primitive fields,
         repeated fields, and map fields will always be serialized.  If
         False, only serialize non-empty fields.  Singular message fields
         and oneof fields are not affected by this option.
-    preserving_proto_field_name: If True, use the original proto field
-        names as defined in the .proto file. If False, convert the field
-        names to lowerCamelCase.
 
   Returns:
     A string containing the JSON formatted protocol buffer message.
   """
-  printer = _Printer(including_default_value_fields,
-                     preserving_proto_field_name)
-  return printer.ToJsonString(message)
+  js = _MessageToJsonObject(message, including_default_value_fields)
+  return json.dumps(js, indent=2)
 
 
-def MessageToDict(message,
-                  including_default_value_fields=False,
-                  preserving_proto_field_name=False):
-  """Converts protobuf message to a JSON dictionary.
-
-  Args:
-    message: The protocol buffers message instance to serialize.
-    including_default_value_fields: If True, singular primitive fields,
-        repeated fields, and map fields will always be serialized.  If
-        False, only serialize non-empty fields.  Singular message fields
-        and oneof fields are not affected by this option.
-    preserving_proto_field_name: If True, use the original proto field
-        names as defined in the .proto file. If False, convert the field
-        names to lowerCamelCase.
-
-  Returns:
-    A dict representation of the JSON formatted protocol buffer message.
-  """
-  printer = _Printer(including_default_value_fields,
-                     preserving_proto_field_name)
-  # pylint: disable=protected-access
-  return printer._MessageToJsonObject(message)
+def _MessageToJsonObject(message, including_default_value_fields):
+  """Converts message to an object according to Proto3 JSON Specification."""
+  message_descriptor = message.DESCRIPTOR
+  full_name = message_descriptor.full_name
+  if _IsWrapperMessage(message_descriptor):
+    return _WrapperMessageToJsonObject(message)
+  if full_name in _WKTJSONMETHODS:
+    return _WKTJSONMETHODS[full_name][0](
+        message, including_default_value_fields)
+  js = {}
+  return _RegularMessageToJsonObject(
+      message, js, including_default_value_fields)
 
 
 def _IsMapEntry(field):
   return (field.type == descriptor.FieldDescriptor.TYPE_MESSAGE and
           field.message_type.has_options and
           field.message_type.GetOptions().map_entry)
 
 
-class _Printer(object):
-  """JSON format printer for protocol message."""
+def _RegularMessageToJsonObject(message, js, including_default_value_fields):
+  """Converts normal message according to Proto3 JSON Specification."""
+  fields = message.ListFields()
+  include_default = including_default_value_fields
 
-  def __init__(self,
-               including_default_value_fields=False,
-               preserving_proto_field_name=False):
-    self.including_default_value_fields = including_default_value_fields
-    self.preserving_proto_field_name = preserving_proto_field_name
+  try:
+    for field, value in fields:
+      name = field.camelcase_name
+      if _IsMapEntry(field):
+        # Convert a map field.
+        v_field = field.message_type.fields_by_name['value']
+        js_map = {}
+        for key in value:
+          if isinstance(key, bool):
+            if key:
+              recorded_key = 'true'
+            else:
+              recorded_key = 'false'
+          else:
+            recorded_key = key
+          js_map[recorded_key] = _FieldToJsonObject(
+              v_field, value[key], including_default_value_fields)
+        js[name] = js_map
+      elif field.label == descriptor.FieldDescriptor.LABEL_REPEATED:
+        # Convert a repeated field.
+        js[name] = [_FieldToJsonObject(field, k, include_default)
+                    for k in value]
+      else:
+        js[name] = _FieldToJsonObject(field, value, include_default)
 
-  def ToJsonString(self, message):
-    js = self._MessageToJsonObject(message)
-    return json.dumps(js, indent=2)
+    # Serialize default value if including_default_value_fields is True.
+    if including_default_value_fields:
+      message_descriptor = message.DESCRIPTOR
+      for field in message_descriptor.fields:
+        # Singular message fields and oneof fields will not be affected.
+        if ((field.label != descriptor.FieldDescriptor.LABEL_REPEATED and
+             field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE) or
+            field.containing_oneof):
+          continue
+        name = field.camelcase_name
+        if name in js:
+          # Skip the field which has been serailized already.
+          continue
+        if _IsMapEntry(field):
+          js[name] = {}
+        elif field.label == descriptor.FieldDescriptor.LABEL_REPEATED:
+          js[name] = []
+        else:
+          js[name] = _FieldToJsonObject(field, field.default_value)
 
-  def _MessageToJsonObject(self, message):
-    """Converts message to an object according to Proto3 JSON Specification."""
-    message_descriptor = message.DESCRIPTOR
-    full_name = message_descriptor.full_name
-    if _IsWrapperMessage(message_descriptor):
-      return self._WrapperMessageToJsonObject(message)
-    if full_name in _WKTJSONMETHODS:
-      return methodcaller(_WKTJSONMETHODS[full_name][0], message)(self)
-    js = {}
-    return self._RegularMessageToJsonObject(message, js)
+  except ValueError as e:
+    raise SerializeToJsonError(
+        'Failed to serialize {0} field: {1}.'.format(field.name, e))
 
-  def _RegularMessageToJsonObject(self, message, js):
-    """Converts normal message according to Proto3 JSON Specification."""
-    fields = message.ListFields()
-
-    try:
-      for field, value in fields:
-        if self.preserving_proto_field_name:
-          name = field.name
-        else:
-          name = field.json_name
-        if _IsMapEntry(field):
-          # Convert a map field.
-          v_field = field.message_type.fields_by_name['value']
-          js_map = {}
-          for key in value:
-            if isinstance(key, bool):
-              if key:
-                recorded_key = 'true'
-              else:
-                recorded_key = 'false'
-            else:
-              recorded_key = key
-            js_map[recorded_key] = self._FieldToJsonObject(
-                v_field, value[key])
-          js[name] = js_map
-        elif field.label == descriptor.FieldDescriptor.LABEL_REPEATED:
-          # Convert a repeated field.
-          js[name] = [self._FieldToJsonObject(field, k)
-                      for k in value]
-        else:
-          js[name] = self._FieldToJsonObject(field, value)
-
-      # Serialize default value if including_default_value_fields is True.
-      if self.including_default_value_fields:
-        message_descriptor = message.DESCRIPTOR
-        for field in message_descriptor.fields:
-          # Singular message fields and oneof fields will not be affected.
-          if ((field.label != descriptor.FieldDescriptor.LABEL_REPEATED and
-               field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE) or
-              field.containing_oneof):
-            continue
-          if self.preserving_proto_field_name:
-            name = field.name
-          else:
-            name = field.json_name
-          if name in js:
-            # Skip the field which has been serailized already.
-            continue
-          if _IsMapEntry(field):
-            js[name] = {}
-          elif field.label == descriptor.FieldDescriptor.LABEL_REPEATED:
-            js[name] = []
-          else:
-            js[name] = self._FieldToJsonObject(field, field.default_value)
-
-    except ValueError as e:
-      raise SerializeToJsonError(
-          'Failed to serialize {0} field: {1}.'.format(field.name, e))
-
-    return js
-
-  def _FieldToJsonObject(self, field, value):
-    """Converts field value according to Proto3 JSON Specification."""
-    if field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE:
-      return self._MessageToJsonObject(value)
-    elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_ENUM:
-      enum_value = field.enum_type.values_by_number.get(value, None)
-      if enum_value is not None:
-        return enum_value.name
-      else:
-        raise SerializeToJsonError('Enum field contains an integer value '
-                                   'which can not mapped to an enum value.')
-    elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_STRING:
-      if field.type == descriptor.FieldDescriptor.TYPE_BYTES:
-        # Use base64 Data encoding for bytes
-        return base64.b64encode(value).decode('utf-8')
-      else:
-        return value
-    elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_BOOL:
-      return bool(value)
-    elif field.cpp_type in _INT64_TYPES:
-      return str(value)
-    elif field.cpp_type in _FLOAT_TYPES:
-      if math.isinf(value):
-        if value < 0.0:
-          return _NEG_INFINITY
-        else:
-          return _INFINITY
-      if math.isnan(value):
-        return _NAN
-    return value
-
-  def _AnyMessageToJsonObject(self, message):
-    """Converts Any message according to Proto3 JSON Specification."""
-    if not message.ListFields():
-      return {}
-    # Must print @type first, use OrderedDict instead of {}
-    js = OrderedDict()
-    type_url = message.type_url
-    js['@type'] = type_url
-    sub_message = _CreateMessageFromTypeUrl(type_url)
-    sub_message.ParseFromString(message.value)
-    message_descriptor = sub_message.DESCRIPTOR
-    full_name = message_descriptor.full_name
-    if _IsWrapperMessage(message_descriptor):
-      js['value'] = self._WrapperMessageToJsonObject(sub_message)
-      return js
-    if full_name in _WKTJSONMETHODS:
-      js['value'] = methodcaller(_WKTJSONMETHODS[full_name][0],
-                                 sub_message)(self)
-      return js
-    return self._RegularMessageToJsonObject(sub_message, js)
-
-  def _GenericMessageToJsonObject(self, message):
-    """Converts message according to Proto3 JSON Specification."""
-    # Duration, Timestamp and FieldMask have ToJsonString method to do the
-    # convert. Users can also call the method directly.
-    return message.ToJsonString()
-
-  def _ValueMessageToJsonObject(self, message):
-    """Converts Value message according to Proto3 JSON Specification."""
-    which = message.WhichOneof('kind')
-    # If the Value message is not set treat as null_value when serialize
-    # to JSON. The parse back result will be different from original message.
-    if which is None or which == 'null_value':
-      return None
-    if which == 'list_value':
-      return self._ListValueMessageToJsonObject(message.list_value)
-    if which == 'struct_value':
-      value = message.struct_value
-    else:
-      value = getattr(message, which)
-    oneof_descriptor = message.DESCRIPTOR.fields_by_name[which]
-    return self._FieldToJsonObject(oneof_descriptor, value)
-
-  def _ListValueMessageToJsonObject(self, message):
-    """Converts ListValue message according to Proto3 JSON Specification."""
-    return [self._ValueMessageToJsonObject(value)
-            for value in message.values]
-
-  def _StructMessageToJsonObject(self, message):
-    """Converts Struct message according to Proto3 JSON Specification."""
-    fields = message.fields
-    ret = {}
-    for key in fields:
-      ret[key] = self._ValueMessageToJsonObject(fields[key])
-    return ret
-
-  def _WrapperMessageToJsonObject(self, message):
-    return self._FieldToJsonObject(
-        message.DESCRIPTOR.fields_by_name['value'], message.value)
+  return js
 
 
-def _IsWrapperMessage(message_descriptor):
-  return message_descriptor.file.name == 'google/protobuf/wrappers.proto'
+def _FieldToJsonObject(
+    field, value, including_default_value_fields=False):
+  """Converts field value according to Proto3 JSON Specification."""
+  if field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE:
+    return _MessageToJsonObject(value, including_default_value_fields)
+  elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_ENUM:
+    enum_value = field.enum_type.values_by_number.get(value, None)
+    if enum_value is not None:
+      return enum_value.name
+    else:
+      raise SerializeToJsonError('Enum field contains an integer value '
+                                 'which can not mapped to an enum value.')
+  elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_STRING:
+    if field.type == descriptor.FieldDescriptor.TYPE_BYTES:
+      # Use base64 Data encoding for bytes
+      return base64.b64encode(value).decode('utf-8')
+    else:
+      return value
+  elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_BOOL:
+    return bool(value)
+  elif field.cpp_type in _INT64_TYPES:
+    return str(value)
+  elif field.cpp_type in _FLOAT_TYPES:
+    if math.isinf(value):
+      if value < 0.0:
+        return _NEG_INFINITY
+      else:
+        return _INFINITY
+    if math.isnan(value):
+      return _NAN
+  return value
 
 
-def _DuplicateChecker(js):
-  result = {}
-  for name, value in js:
-    if name in result:
-      raise ParseError('Failed to load JSON: duplicate key {0}.'.format(name))
-    result[name] = value
-  return result
+def _AnyMessageToJsonObject(message, including_default):
+  """Converts Any message according to Proto3 JSON Specification."""
+  if not message.ListFields():
+    return {}
+  js = {}
+  type_url = message.type_url
+  js['@type'] = type_url
+  sub_message = _CreateMessageFromTypeUrl(type_url)
+  sub_message.ParseFromString(message.value)
+  message_descriptor = sub_message.DESCRIPTOR
+  full_name = message_descriptor.full_name
+  if _IsWrapperMessage(message_descriptor):
+    js['value'] = _WrapperMessageToJsonObject(sub_message)
+    return js
+  if full_name in _WKTJSONMETHODS:
+    js['value'] = _WKTJSONMETHODS[full_name][0](sub_message, including_default)
+    return js
+  return _RegularMessageToJsonObject(sub_message, js, including_default)
 
 
 def _CreateMessageFromTypeUrl(type_url):
   # TODO(jieluo): Should add a way that users can register the type resolver
   # instead of the default one.
   db = symbol_database.Default()
   type_name = type_url.split('/')[-1]
   try:
     message_descriptor = db.pool.FindMessageTypeByName(type_name)
   except KeyError:
     raise TypeError(
         'Can not find message descriptor by type_url: {0}.'.format(type_url))
   message_class = db.GetPrototype(message_descriptor)
   return message_class()
 
 
-def Parse(text, message, ignore_unknown_fields=False):
+def _GenericMessageToJsonObject(message, unused_including_default):
+  """Converts message by ToJsonString according to Proto3 JSON Specification."""
+  # Duration, Timestamp and FieldMask have ToJsonString method to do the
+  # convert. Users can also call the method directly.
+  return message.ToJsonString()
+
+
+def _ValueMessageToJsonObject(message, unused_including_default=False):
+  """Converts Value message according to Proto3 JSON Specification."""
+  which = message.WhichOneof('kind')
+  # If the Value message is not set treat as null_value when serialize
+  # to JSON. The parse back result will be different from original message.
+  if which is None or which == 'null_value':
+    return None
+  if which == 'list_value':
+    return _ListValueMessageToJsonObject(message.list_value)
+  if which == 'struct_value':
+    value = message.struct_value
+  else:
+    value = getattr(message, which)
+  oneof_descriptor = message.DESCRIPTOR.fields_by_name[which]
+  return _FieldToJsonObject(oneof_descriptor, value)
+
+
+def _ListValueMessageToJsonObject(message, unused_including_default=False):
+  """Converts ListValue message according to Proto3 JSON Specification."""
+  return [_ValueMessageToJsonObject(value)
+          for value in message.values]
+
+
+def _StructMessageToJsonObject(message, unused_including_default=False):
+  """Converts Struct message according to Proto3 JSON Specification."""
+  fields = message.fields
+  ret = {}
+  for key in fields:
+    ret[key] = _ValueMessageToJsonObject(fields[key])
+  return ret
+
+
+def _IsWrapperMessage(message_descriptor):
+  return message_descriptor.file.name == 'google/protobuf/wrappers.proto'
+
+
+def _WrapperMessageToJsonObject(message):
+  return _FieldToJsonObject(
+      message.DESCRIPTOR.fields_by_name['value'], message.value)
+
+
+def _DuplicateChecker(js):
+  result = {}
+  for name, value in js:
+    if name in result:
+      raise ParseError('Failed to load JSON: duplicate key {0}.'.format(name))
+    result[name] = value
+  return result
+
+
+def Parse(text, message):
   """Parses a JSON representation of a protocol message into a message.
 
   Args:
     text: Message JSON representation.
-    message: A protocol buffer message to merge into.
-    ignore_unknown_fields: If True, do not raise errors for unknown fields.
+    message: A protocol beffer message to merge into.
 
   Returns:
     The same message passed as argument.
 
   Raises::
     ParseError: On JSON parsing problems.
   """
   if not isinstance(text, six.text_type): text = text.decode('utf-8')
   try:
     if sys.version_info < (2, 7):
       # object_pair_hook is not supported before python2.7
       js = json.loads(text)
     else:
       js = json.loads(text, object_pairs_hook=_DuplicateChecker)
   except ValueError as e:
     raise ParseError('Failed to load JSON: {0}.'.format(str(e)))
-  return ParseDict(js, message, ignore_unknown_fields)
-
-
-def ParseDict(js_dict, message, ignore_unknown_fields=False):
-  """Parses a JSON dictionary representation into a message.
+  _ConvertMessage(js, message)
+  return message
+
+
+def _ConvertFieldValuePair(js, message):
+  """Convert field value pairs into regular message.
 
   Args:
-    js_dict: Dict representation of a JSON message.
-    message: A protocol buffer message to merge into.
-    ignore_unknown_fields: If True, do not raise errors for unknown fields.
-
-  Returns:
-    The same message passed as argument.
+    js: A JSON object to convert the field value pairs.
+    message: A regular protocol message to record the data.
+
+  Raises:
+    ParseError: In case of problems converting.
   """
-  parser = _Parser(ignore_unknown_fields)
-  parser.ConvertMessage(js_dict, message)
-  return message
+  names = []
+  message_descriptor = message.DESCRIPTOR
+  for name in js:
+    try:
+      field = message_descriptor.fields_by_camelcase_name.get(name, None)
+      if not field:
+        raise ParseError(
+            'Message type "{0}" has no field named "{1}".'.format(
+                message_descriptor.full_name, name))
+      if name in names:
+        raise ParseError(
+            'Message type "{0}" should not have multiple "{1}" fields.'.format(
+                message.DESCRIPTOR.full_name, name))
+      names.append(name)
+      # Check no other oneof field is parsed.
+      if field.containing_oneof is not None:
+        oneof_name = field.containing_oneof.name
+        if oneof_name in names:
+          raise ParseError('Message type "{0}" should not have multiple "{1}" '
+                           'oneof fields.'.format(
+                               message.DESCRIPTOR.full_name, oneof_name))
+        names.append(oneof_name)
+
+      value = js[name]
+      if value is None:
+        message.ClearField(field.name)
+        continue
+
+      # Parse field value.
+      if _IsMapEntry(field):
+        message.ClearField(field.name)
+        _ConvertMapFieldValue(value, message, field)
+      elif field.label == descriptor.FieldDescriptor.LABEL_REPEATED:
+        message.ClearField(field.name)
+        if not isinstance(value, list):
+          raise ParseError('repeated field {0} must be in [] which is '
+                           '{1}.'.format(name, value))
+        if field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE:
+          # Repeated message field.
+          for item in value:
+            sub_message = getattr(message, field.name).add()
+            # None is a null_value in Value.
+            if (item is None and
+                sub_message.DESCRIPTOR.full_name != 'google.protobuf.Value'):
+              raise ParseError('null is not allowed to be used as an element'
+                               ' in a repeated field.')
+            _ConvertMessage(item, sub_message)
+        else:
+          # Repeated scalar field.
+          for item in value:
+            if item is None:
+              raise ParseError('null is not allowed to be used as an element'
+                               ' in a repeated field.')
+            getattr(message, field.name).append(
+                _ConvertScalarFieldValue(item, field))
+      elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE:
+        sub_message = getattr(message, field.name)
+        _ConvertMessage(value, sub_message)
+      else:
+        setattr(message, field.name, _ConvertScalarFieldValue(value, field))
+    except ParseError as e:
+      if field and field.containing_oneof is None:
+        raise ParseError('Failed to parse {0} field: {1}'.format(name, e))
+      else:
+        raise ParseError(str(e))
+    except ValueError as e:
+      raise ParseError('Failed to parse {0} field: {1}.'.format(name, e))
+    except TypeError as e:
+      raise ParseError('Failed to parse {0} field: {1}.'.format(name, e))
+
+
+def _ConvertMessage(value, message):
+  """Convert a JSON object into a message.
+
+  Args:
+    value: A JSON object.
+    message: A WKT or regular protocol message to record the data.
+
+  Raises:
+    ParseError: In case of convert problems.
+  """
+  message_descriptor = message.DESCRIPTOR
+  full_name = message_descriptor.full_name
+  if _IsWrapperMessage(message_descriptor):
+    _ConvertWrapperMessage(value, message)
+  elif full_name in _WKTJSONMETHODS:
+    _WKTJSONMETHODS[full_name][1](value, message)
+  else:
+    _ConvertFieldValuePair(value, message)
+
+
+def _ConvertAnyMessage(value, message):
+  """Convert a JSON representation into Any message."""
+  if isinstance(value, dict) and not value:
+    return
+  try:
+    type_url = value['@type']
+  except KeyError:
+    raise ParseError('@type is missing when parsing any message.')
+
+  sub_message = _CreateMessageFromTypeUrl(type_url)
+  message_descriptor = sub_message.DESCRIPTOR
+  full_name = message_descriptor.full_name
+  if _IsWrapperMessage(message_descriptor):
+    _ConvertWrapperMessage(value['value'], sub_message)
+  elif full_name in _WKTJSONMETHODS:
+    _WKTJSONMETHODS[full_name][1](value['value'], sub_message)
+  else:
+    del value['@type']
+    _ConvertFieldValuePair(value, sub_message)
+  # Sets Any message
+  message.value = sub_message.SerializeToString()
+  message.type_url = type_url
+
+
+def _ConvertGenericMessage(value, message):
+  """Convert a JSON representation into message with FromJsonString."""
+  # Durantion, Timestamp, FieldMask have FromJsonString method to do the
+  # convert. Users can also call the method directly.
+  message.FromJsonString(value)
 
 
 _INT_OR_FLOAT = six.integer_types + (float,)
 
 
-class _Parser(object):
-  """JSON format parser for protocol message."""
-
-  def __init__(self,
-               ignore_unknown_fields):
-    self.ignore_unknown_fields = ignore_unknown_fields
-
-  def ConvertMessage(self, value, message):
-    """Convert a JSON object into a message.
-
-    Args:
-      value: A JSON object.
-      message: A WKT or regular protocol message to record the data.
-
-    Raises:
-      ParseError: In case of convert problems.
-    """
-    message_descriptor = message.DESCRIPTOR
-    full_name = message_descriptor.full_name
-    if _IsWrapperMessage(message_descriptor):
-      self._ConvertWrapperMessage(value, message)
-    elif full_name in _WKTJSONMETHODS:
-      methodcaller(_WKTJSONMETHODS[full_name][1], value, message)(self)
+def _ConvertValueMessage(value, message):
+  """Convert a JSON representation into Value message."""
+  if isinstance(value, dict):
+    _ConvertStructMessage(value, message.struct_value)
+  elif isinstance(value, list):
+    _ConvertListValueMessage(value, message.list_value)
+  elif value is None:
+    message.null_value = 0
+  elif isinstance(value, bool):
+    message.bool_value = value
+  elif isinstance(value, six.string_types):
+    message.string_value = value
+  elif isinstance(value, _INT_OR_FLOAT):
+    message.number_value = value
+  else:
+    raise ParseError('Unexpected type for Value message.')
+
+
+def _ConvertListValueMessage(value, message):
+  """Convert a JSON representation into ListValue message."""
+  if not isinstance(value, list):
+    raise ParseError(
+        'ListValue must be in [] which is {0}.'.format(value))
+  message.ClearField('values')
+  for item in value:
+    _ConvertValueMessage(item, message.values.add())
+
+
+def _ConvertStructMessage(value, message):
+  """Convert a JSON representation into Struct message."""
+  if not isinstance(value, dict):
+    raise ParseError(
+        'Struct must be in a dict which is {0}.'.format(value))
+  for key in value:
+    _ConvertValueMessage(value[key], message.fields[key])
+  return
+
+
+def _ConvertWrapperMessage(value, message):
+  """Convert a JSON representation into Wrapper message."""
+  field = message.DESCRIPTOR.fields_by_name['value']
+  setattr(message, 'value', _ConvertScalarFieldValue(value, field))
+
+
+def _ConvertMapFieldValue(value, message, field):
+  """Convert map field value for a message map field.
+
+  Args:
+    value: A JSON object to convert the map field value.
+    message: A protocol message to record the converted data.
+    field: The descriptor of the map field to be converted.
+
+  Raises:
+    ParseError: In case of convert problems.
+  """
+  if not isinstance(value, dict):
+    raise ParseError(
+        'Map field {0} must be in a dict which is {1}.'.format(
+            field.name, value))
+  key_field = field.message_type.fields_by_name['key']
+  value_field = field.message_type.fields_by_name['value']
+  for key in value:
+    key_value = _ConvertScalarFieldValue(key, key_field, True)
+    if value_field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE:
+      _ConvertMessage(value[key], getattr(message, field.name)[key_value])
     else:
-      self._ConvertFieldValuePair(value, message)
-
-  def _ConvertFieldValuePair(self, js, message):
-    """Convert field value pairs into regular message.
-
-    Args:
-      js: A JSON object to convert the field value pairs.
-      message: A regular protocol message to record the data.
-
-    Raises:
-      ParseError: In case of problems converting.
-    """
-    names = []
-    message_descriptor = message.DESCRIPTOR
-    fields_by_json_name = dict((f.json_name, f)
-                               for f in message_descriptor.fields)
-    for name in js:
-      try:
-        field = fields_by_json_name.get(name, None)
-        if not field:
-          field = message_descriptor.fields_by_name.get(name, None)
-        if not field:
-          if self.ignore_unknown_fields:
-            continue
-          raise ParseError(
-              'Message type "{0}" has no field named "{1}".'.format(
-                  message_descriptor.full_name, name))
-        if name in names:
-          raise ParseError('Message type "{0}" should not have multiple '
-                           '"{1}" fields.'.format(
-                               message.DESCRIPTOR.full_name, name))
-        names.append(name)
-        # Check no other oneof field is parsed.
-        if field.containing_oneof is not None:
-          oneof_name = field.containing_oneof.name
-          if oneof_name in names:
-            raise ParseError('Message type "{0}" should not have multiple '
-                             '"{1}" oneof fields.'.format(
-                                 message.DESCRIPTOR.full_name, oneof_name))
-          names.append(oneof_name)
-
-        value = js[name]
-        if value is None:
-          if (field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE
-              and field.message_type.full_name == 'google.protobuf.Value'):
-            sub_message = getattr(message, field.name)
-            sub_message.null_value = 0
-          else:
-            message.ClearField(field.name)
-          continue
-
-        # Parse field value.
-        if _IsMapEntry(field):
-          message.ClearField(field.name)
-          self._ConvertMapFieldValue(value, message, field)
-        elif field.label == descriptor.FieldDescriptor.LABEL_REPEATED:
-          message.ClearField(field.name)
-          if not isinstance(value, list):
-            raise ParseError('repeated field {0} must be in [] which is '
-                             '{1}.'.format(name, value))
-          if field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE:
-            # Repeated message field.
-            for item in value:
-              sub_message = getattr(message, field.name).add()
-              # None is a null_value in Value.
-              if (item is None and
-                  sub_message.DESCRIPTOR.full_name != 'google.protobuf.Value'):
-                raise ParseError('null is not allowed to be used as an element'
-                                 ' in a repeated field.')
-              self.ConvertMessage(item, sub_message)
-          else:
-            # Repeated scalar field.
-            for item in value:
-              if item is None:
-                raise ParseError('null is not allowed to be used as an element'
-                                 ' in a repeated field.')
-              getattr(message, field.name).append(
-                  _ConvertScalarFieldValue(item, field))
-        elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE:
-          sub_message = getattr(message, field.name)
-          sub_message.SetInParent()
-          self.ConvertMessage(value, sub_message)
-        else:
-          setattr(message, field.name, _ConvertScalarFieldValue(value, field))
-      except ParseError as e:
-        if field and field.containing_oneof is None:
-          raise ParseError('Failed to parse {0} field: {1}'.format(name, e))
-        else:
-          raise ParseError(str(e))
-      except ValueError as e:
-        raise ParseError('Failed to parse {0} field: {1}.'.format(name, e))
-      except TypeError as e:
-        raise ParseError('Failed to parse {0} field: {1}.'.format(name, e))
-
-  def _ConvertAnyMessage(self, value, message):
-    """Convert a JSON representation into Any message."""
-    if isinstance(value, dict) and not value:
-      return
-    try:
-      type_url = value['@type']
-    except KeyError:
-      raise ParseError('@type is missing when parsing any message.')
-
-    sub_message = _CreateMessageFromTypeUrl(type_url)
-    message_descriptor = sub_message.DESCRIPTOR
-    full_name = message_descriptor.full_name
-    if _IsWrapperMessage(message_descriptor):
-      self._ConvertWrapperMessage(value['value'], sub_message)
-    elif full_name in _WKTJSONMETHODS:
-      methodcaller(
-          _WKTJSONMETHODS[full_name][1], value['value'], sub_message)(self)
-    else:
-      del value['@type']
-      self._ConvertFieldValuePair(value, sub_message)
-    # Sets Any message
-    message.value = sub_message.SerializeToString()
-    message.type_url = type_url
-
-  def _ConvertGenericMessage(self, value, message):
-    """Convert a JSON representation into message with FromJsonString."""
-    # Durantion, Timestamp, FieldMask have FromJsonString method to do the
-    # convert. Users can also call the method directly.
-    message.FromJsonString(value)
-
-  def _ConvertValueMessage(self, value, message):
-    """Convert a JSON representation into Value message."""
-    if isinstance(value, dict):
-      self._ConvertStructMessage(value, message.struct_value)
-    elif isinstance(value, list):
-      self. _ConvertListValueMessage(value, message.list_value)
-    elif value is None:
-      message.null_value = 0
-    elif isinstance(value, bool):
-      message.bool_value = value
-    elif isinstance(value, six.string_types):
-      message.string_value = value
-    elif isinstance(value, _INT_OR_FLOAT):
-      message.number_value = value
-    else:
-      raise ParseError('Unexpected type for Value message.')
-
-  def _ConvertListValueMessage(self, value, message):
-    """Convert a JSON representation into ListValue message."""
-    if not isinstance(value, list):
-      raise ParseError(
-          'ListValue must be in [] which is {0}.'.format(value))
-    message.ClearField('values')
-    for item in value:
-      self._ConvertValueMessage(item, message.values.add())
-
-  def _ConvertStructMessage(self, value, message):
-    """Convert a JSON representation into Struct message."""
-    if not isinstance(value, dict):
-      raise ParseError(
-          'Struct must be in a dict which is {0}.'.format(value))
-    for key in value:
-      self._ConvertValueMessage(value[key], message.fields[key])
-    return
-
-  def _ConvertWrapperMessage(self, value, message):
-    """Convert a JSON representation into Wrapper message."""
-    field = message.DESCRIPTOR.fields_by_name['value']
-    setattr(message, 'value', _ConvertScalarFieldValue(value, field))
-
-  def _ConvertMapFieldValue(self, value, message, field):
-    """Convert map field value for a message map field.
-
-    Args:
-      value: A JSON object to convert the map field value.
-      message: A protocol message to record the converted data.
-      field: The descriptor of the map field to be converted.
-
-    Raises:
-      ParseError: In case of convert problems.
-    """
-    if not isinstance(value, dict):
-      raise ParseError(
-          'Map field {0} must be in a dict which is {1}.'.format(
-              field.name, value))
-    key_field = field.message_type.fields_by_name['key']
-    value_field = field.message_type.fields_by_name['value']
-    for key in value:
-      key_value = _ConvertScalarFieldValue(key, key_field, True)
-      if value_field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE:
-        self.ConvertMessage(value[key], getattr(
-            message, field.name)[key_value])
-      else:
-        getattr(message, field.name)[key_value] = _ConvertScalarFieldValue(
-            value[key], value_field)
+      getattr(message, field.name)[key_value] = _ConvertScalarFieldValue(
+          value[key], value_field)
 
 
 def _ConvertScalarFieldValue(value, field, require_str=False):
   """Convert a single scalar field value.
 
   Args:
     value: A scalar value to convert the scalar field value.
     field: The descriptor of the field to convert.
     require_str: If True, the field value must be a str.
 
   Returns:
     The converted scalar field value
 
   Raises:
     ParseError: In case of convert problems.
   """
   if field.cpp_type in _INT_TYPES:
     return _ConvertInteger(value)
   elif field.cpp_type in _FLOAT_TYPES:
     return _ConvertFloat(value)
   elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_BOOL:
     return _ConvertBool(value, require_str)
   elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_STRING:
     if field.type == descriptor.FieldDescriptor.TYPE_BYTES:
       return base64.b64decode(value)
     else:
-      # Checking for unpaired surrogates appears to be unreliable,
-      # depending on the specific Python version, so we check manually.
-      if _UNPAIRED_SURROGATE_PATTERN.search(value):
-        raise ParseError('Unpaired surrogate')
       return value
   elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_ENUM:
     # Convert an enum value.
     enum_value = field.enum_type.values_by_name.get(value, None)
     if enum_value is None:
-      try:
-        number = int(value)
-        enum_value = field.enum_type.values_by_number.get(number, None)
-      except ValueError:
-        raise ParseError('Invalid enum value {0} for enum type {1}.'.format(
-            value, field.enum_type.full_name))
-      if enum_value is None:
-        raise ParseError('Invalid enum value {0} for enum type {1}.'.format(
-            value, field.enum_type.full_name))
+      raise ParseError(
+          'Enum value must be a string literal with double quotes. '
+          'Type "{0}" has no value named {1}.'.format(
+              field.enum_type.full_name, value))
     return enum_value.number
 
 
 def _ConvertInteger(value):
   """Convert an integer.
 
   Args:
     value: A scalar value to convert.
 
   Returns:
     The integer value.
 
   Raises:
     ParseError: If an integer couldn't be consumed.
   """
-  if isinstance(value, float) and not value.is_integer():
+  if isinstance(value, float):
     raise ParseError('Couldn\'t parse integer: {0}.'.format(value))
 
   if isinstance(value, six.text_type) and value.find(' ') != -1:
     raise ParseError('Couldn\'t parse integer: "{0}".'.format(value))
 
   return int(value)
 
 
 def _ConvertFloat(value):
   """Convert an floating point number."""
@@ skipping 33 matching lines @@
     elif value == 'false':
       return False
     else:
       raise ParseError('Expected "true" or "false", not {0}.'.format(value))
 
   if not isinstance(value, bool):
     raise ParseError('Expected true or false without quotes.')
   return value
 
 _WKTJSONMETHODS = {
-    'google.protobuf.Any': ['_AnyMessageToJsonObject',
-                            '_ConvertAnyMessage'],
-    'google.protobuf.Duration': ['_GenericMessageToJsonObject',
-                                 '_ConvertGenericMessage'],
-    'google.protobuf.FieldMask': ['_GenericMessageToJsonObject',
-                                  '_ConvertGenericMessage'],
-    'google.protobuf.ListValue': ['_ListValueMessageToJsonObject',
-                                  '_ConvertListValueMessage'],
-    'google.protobuf.Struct': ['_StructMessageToJsonObject',
-                               '_ConvertStructMessage'],
-    'google.protobuf.Timestamp': ['_GenericMessageToJsonObject',
-                                  '_ConvertGenericMessage'],
-    'google.protobuf.Value': ['_ValueMessageToJsonObject',
-                              '_ConvertValueMessage']
+    'google.protobuf.Any': [_AnyMessageToJsonObject,
+                            _ConvertAnyMessage],
+    'google.protobuf.Duration': [_GenericMessageToJsonObject,
+                                 _ConvertGenericMessage],
+    'google.protobuf.FieldMask': [_GenericMessageToJsonObject,
+                                  _ConvertGenericMessage],
+    'google.protobuf.ListValue': [_ListValueMessageToJsonObject,
+                                  _ConvertListValueMessage],
+    'google.protobuf.Struct': [_StructMessageToJsonObject,
+                               _ConvertStructMessage],
+    'google.protobuf.Timestamp': [_GenericMessageToJsonObject,
+                                  _ConvertGenericMessage],
+    'google.protobuf.Value': [_ValueMessageToJsonObject,
+                              _ConvertValueMessage]
 }