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✏️ Editing: text_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.
#     * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
#     * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

"""Contains routines for printing protocol messages in text format.

Simple usage example:

# Create a proto object and serialize it to a text proto string.
  message = my_proto_pb2.MyMessage(foo='bar')
  text_proto = text_format.MessageToString(message)

# Parse a text proto string.
  message = text_format.Parse(text_proto, my_proto_pb2.MyMessage())
"""

__author__ = 'kenton@google.com (Kenton Varda)'

import io
import re

import six

if six.PY3:
  long = int  # pylint: disable=redefined-builtin,invalid-name

# pylint: disable=g-import-not-at-top
from google.protobuf.internal import type_checkers
from google.protobuf import descriptor
from google.protobuf import text_encoding

__all__ = ['MessageToString', 'PrintMessage', 'PrintField', 'PrintFieldValue',
           'Merge']

_INTEGER_CHECKERS = (type_checkers.Uint32ValueChecker(),
                     type_checkers.Int32ValueChecker(),
                     type_checkers.Uint64ValueChecker(),
                     type_checkers.Int64ValueChecker())
_FLOAT_INFINITY = re.compile('-?inf(?:inity)?f?', re.IGNORECASE)
_FLOAT_NAN = re.compile('nanf?', re.IGNORECASE)
_FLOAT_TYPES = frozenset([descriptor.FieldDescriptor.CPPTYPE_FLOAT,
                          descriptor.FieldDescriptor.CPPTYPE_DOUBLE])
_QUOTES = frozenset(("'", '"'))
_ANY_FULL_TYPE_NAME = 'google.protobuf.Any'

class Error(Exception):
  """Top-level module error for text_format."""

class ParseError(Error):
  """Thrown in case of text parsing or tokenizing error."""

def __init__(self, message=None, line=None, column=None):
    if message is not None and line is not None:
      loc = str(line)
      if column is not None:
        loc += ':{0}'.format(column)
      message = '{0} : {1}'.format(loc, message)
    if message is not None:
      super(ParseError, self).__init__(message)
    else:
      super(ParseError, self).__init__()
    self._line = line
    self._column = column

def GetLine(self):
    return self._line

def GetColumn(self):
    return self._column

class TextWriter(object):

def __init__(self, as_utf8):
    if six.PY2:
      self._writer = io.BytesIO()
    else:
      self._writer = io.StringIO()

def write(self, val):
    if six.PY2:
      if isinstance(val, six.text_type):
        val = val.encode('utf-8')
    return self._writer.write(val)

def close(self):
    return self._writer.close()

def getvalue(self):
    return self._writer.getvalue()

def MessageToString(message,
                    as_utf8=False,
                    as_one_line=False,
                    pointy_brackets=False,
                    use_index_order=False,
                    float_format=None,
                    use_field_number=False,
                    descriptor_pool=None,
                    indent=0,
                    message_formatter=None):
  """Convert protobuf message to text format.

Floating point values can be formatted compactly with 15 digits of
  precision (which is the most that IEEE 754 "double" can guarantee)
  using float_format='.15g'. To ensure that converting to text and back to a
  proto will result in an identical value, float_format='.17g' should be used.

Args:
    message: The protocol buffers message.
    as_utf8: Produce text output in UTF8 format.
    as_one_line: Don't introduce newlines between fields.
    pointy_brackets: If True, use angle brackets instead of curly braces for
      nesting.
    use_index_order: If True, print fields of a proto message using the order
      defined in source code instead of the field number. By default, use the
      field number order.
    float_format: If set, use this to specify floating point number formatting
      (per the "Format Specification Mini-Language"); otherwise, str() is used.
    use_field_number: If True, print field numbers instead of names.
    descriptor_pool: A DescriptorPool used to resolve Any types.
    indent: The indent level, in terms of spaces, for pretty print.
    message_formatter: A function(message, indent, as_one_line): unicode|None
      to custom format selected sub-messages (usually based on message type).
      Use to pretty print parts of the protobuf for easier diffing.

Returns:
    A string of the text formatted protocol buffer message.
  """
  out = TextWriter(as_utf8)
  printer = _Printer(out, indent, as_utf8, as_one_line, pointy_brackets,
                     use_index_order, float_format, use_field_number,
                     descriptor_pool, message_formatter)
  printer.PrintMessage(message)
  result = out.getvalue()
  out.close()
  if as_one_line:
    return result.rstrip()
  return result

def _IsMapEntry(field):
  return (field.type == descriptor.FieldDescriptor.TYPE_MESSAGE and
          field.message_type.has_options and
          field.message_type.GetOptions().map_entry)

def PrintMessage(message,
                 out,
                 indent=0,
                 as_utf8=False,
                 as_one_line=False,
                 pointy_brackets=False,
                 use_index_order=False,
                 float_format=None,
                 use_field_number=False,
                 descriptor_pool=None,
                 message_formatter=None):
  printer = _Printer(out, indent, as_utf8, as_one_line, pointy_brackets,
                     use_index_order, float_format, use_field_number,
                     descriptor_pool, message_formatter)
  printer.PrintMessage(message)

def PrintField(field,
               value,
               out,
               indent=0,
               as_utf8=False,
               as_one_line=False,
               pointy_brackets=False,
               use_index_order=False,
               float_format=None,
               message_formatter=None):
  """Print a single field name/value pair."""
  printer = _Printer(out, indent, as_utf8, as_one_line, pointy_brackets,
                     use_index_order, float_format, message_formatter)
  printer.PrintField(field, value)

def PrintFieldValue(field,
                    value,
                    out,
                    indent=0,
                    as_utf8=False,
                    as_one_line=False,
                    pointy_brackets=False,
                    use_index_order=False,
                    float_format=None,
                    message_formatter=None):
  """Print a single field value (not including name)."""
  printer = _Printer(out, indent, as_utf8, as_one_line, pointy_brackets,
                     use_index_order, float_format, message_formatter)
  printer.PrintFieldValue(field, value)

def _BuildMessageFromTypeName(type_name, descriptor_pool):
  """Returns a protobuf message instance.

Args:
    type_name: Fully-qualified protobuf  message type name string.
    descriptor_pool: DescriptorPool instance.

Returns:
    A Message instance of type matching type_name, or None if the a Descriptor
    wasn't found matching type_name.
  """
  # pylint: disable=g-import-not-at-top
  if descriptor_pool is None:
    from google.protobuf import descriptor_pool as pool_mod
    descriptor_pool = pool_mod.Default()
  from google.protobuf import symbol_database
  database = symbol_database.Default()
  try:
    message_descriptor = descriptor_pool.FindMessageTypeByName(type_name)
  except KeyError:
    return None
  message_type = database.GetPrototype(message_descriptor)
  return message_type()

class _Printer(object):
  """Text format printer for protocol message."""

def __init__(self,
               out,
               indent=0,
               as_utf8=False,
               as_one_line=False,
               pointy_brackets=False,
               use_index_order=False,
               float_format=None,
               use_field_number=False,
               descriptor_pool=None,
               message_formatter=None):
    """Initialize the Printer.

Floating point values can be formatted compactly with 15 digits of
    precision (which is the most that IEEE 754 "double" can guarantee)
    using float_format='.15g'. To ensure that converting to text and back to a
    proto will result in an identical value, float_format='.17g' should be used.

Args:
      out: To record the text format result.
      indent: The indent level for pretty print.
      as_utf8: Produce text output in UTF8 format.
      as_one_line: Don't introduce newlines between fields.
      pointy_brackets: If True, use angle brackets instead of curly braces for
        nesting.
      use_index_order: If True, print fields of a proto message using the order
        defined in source code instead of the field number. By default, use the
        field number order.
      float_format: If set, use this to specify floating point number formatting
        (per the "Format Specification Mini-Language"); otherwise, str() is
        used.
      use_field_number: If True, print field numbers instead of names.
      descriptor_pool: A DescriptorPool used to resolve Any types.
      message_formatter: A function(message, indent, as_one_line): unicode|None
        to custom format selected sub-messages (usually based on message type).
        Use to pretty print parts of the protobuf for easier diffing.
    """
    self.out = out
    self.indent = indent
    self.as_utf8 = as_utf8
    self.as_one_line = as_one_line
    self.pointy_brackets = pointy_brackets
    self.use_index_order = use_index_order
    self.float_format = float_format
    self.use_field_number = use_field_number
    self.descriptor_pool = descriptor_pool
    self.message_formatter = message_formatter

def _TryPrintAsAnyMessage(self, message):
    """Serializes if message is a google.protobuf.Any field."""
    packed_message = _BuildMessageFromTypeName(message.TypeName(),
                                               self.descriptor_pool)
    if packed_message:
      packed_message.MergeFromString(message.value)
      self.out.write('%s[%s]' % (self.indent * ' ', message.type_url))
      self._PrintMessageFieldValue(packed_message)
      self.out.write(' ' if self.as_one_line else '\n')
      return True
    else:
      return False

def _TryCustomFormatMessage(self, message):
    formatted = self.message_formatter(message, self.indent, self.as_one_line)
    if formatted is None:
      return False

out = self.out
    out.write(' ' * self.indent)
    out.write(formatted)
    out.write(' ' if self.as_one_line else '\n')
    return True

def PrintMessage(self, message):
    """Convert protobuf message to text format.

Args:
      message: The protocol buffers message.
    """
    if self.message_formatter and self._TryCustomFormatMessage(message):
      return
    if (message.DESCRIPTOR.full_name == _ANY_FULL_TYPE_NAME and
        self._TryPrintAsAnyMessage(message)):
      return
    fields = message.ListFields()
    if self.use_index_order:
      fields.sort(key=lambda x: x[0].index)
    for field, value in fields:
      if _IsMapEntry(field):
        for key in sorted(value):
          # This is slow for maps with submessage entires because it copies the
          # entire tree.  Unfortunately this would take significant refactoring
          # of this file to work around.
          #
          # TODO(haberman): refactor and optimize if this becomes an issue.
          entry_submsg = value.GetEntryClass()(key=key, value=value[key])
          self.PrintField(field, entry_submsg)
      elif field.label == descriptor.FieldDescriptor.LABEL_REPEATED:
        for element in value:
          self.PrintField(field, element)
      else:
        self.PrintField(field, value)

def PrintField(self, field, value):
    """Print a single field name/value pair."""
    out = self.out
    out.write(' ' * self.indent)
    if self.use_field_number:
      out.write(str(field.number))
    else:
      if field.is_extension:
        out.write('[')
        if (field.containing_type.GetOptions().message_set_wire_format and
            field.type == descriptor.FieldDescriptor.TYPE_MESSAGE 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(': ')

self.PrintFieldValue(field, value)
    if self.as_one_line:
      out.write(' ')
    else:
      out.write('\n')

def _PrintMessageFieldValue(self, value):
    if self.pointy_brackets:
      openb = '<'
      closeb = '>'
    else:
      openb = '{'
      closeb = '}'

if self.as_one_line:
      self.out.write(' %s ' % openb)
      self.PrintMessage(value)
      self.out.write(closeb)
    else:
      self.out.write(' %s\n' % openb)
      self.indent += 2
      self.PrintMessage(value)
      self.indent -= 2
      self.out.write(' ' * self.indent + closeb)

def PrintFieldValue(self, field, value):
    """Print a single field value (not including name).

For repeated fields, the value should be a single element.

Args:
      field: The descriptor of the field to be printed.
      value: The value of the field.
    """
    out = self.out
    if field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE:
      self._PrintMessageFieldValue(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:
        out.write(enum_value.name)
      else:
        out.write(str(value))
    elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_STRING:
      out.write('\"')
      if isinstance(value, six.text_type):
        out_value = value.encode('utf-8')
      else:
        out_value = value
      if field.type == descriptor.FieldDescriptor.TYPE_BYTES:
        # We need to escape non-UTF8 chars in TYPE_BYTES field.
        out_as_utf8 = False
      else:
        out_as_utf8 = self.as_utf8
      out.write(text_encoding.CEscape(out_value, out_as_utf8))
      out.write('\"')
    elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_BOOL:
      if value:
        out.write('true')
      else:
        out.write('false')
    elif field.cpp_type in _FLOAT_TYPES and self.float_format is not None:
      out.write('{1:{0}}'.format(self.float_format, value))
    else:
      out.write(str(value))

def Parse(text,
          message,
          allow_unknown_extension=False,
          allow_field_number=False,
          descriptor_pool=None):
  """Parses a text representation of a protocol message into a message.

NOTE: for historical reasons this function does not clear the input
  message. This is different from what the binary msg.ParseFrom(...) does.

Example
    a = MyProto()
    a.repeated_field.append('test')
    b = MyProto()

text_format.Parse(repr(a), b)
    text_format.Parse(repr(a), b) # repeated_field contains ["test", "test"]

# Binary version:
    b.ParseFromString(a.SerializeToString()) # repeated_field is now "test"

Caller is responsible for clearing the message as needed.

Args:
    text: Message text representation.
    message: A protocol buffer message to merge into.
    allow_unknown_extension: if True, skip over missing extensions and keep
      parsing
    allow_field_number: if True, both field number and field name are allowed.
    descriptor_pool: A DescriptorPool used to resolve Any types.

Returns:
    The same message passed as argument.

Raises:
    ParseError: On text parsing problems.
  """
  if not isinstance(text, str):
    if six.PY3:
      text = text.decode('utf-8')
    else:
      text = text.encode('utf-8')
  return ParseLines(text.split('\n'),
                    message,
                    allow_unknown_extension,
                    allow_field_number,
                    descriptor_pool=descriptor_pool)

def Merge(text,
          message,
          allow_unknown_extension=False,
          allow_field_number=False,
          descriptor_pool=None):
  """Parses a text representation of a protocol message into a message.

Like Parse(), but allows repeated values for a non-repeated field, and uses
  the last one.

Returns:
    The same message passed as argument.

Raises:
    ParseError: On text parsing problems.
  """
  if not isinstance(text, str):
    if six.PY3:
      text = text.decode('utf-8')
    else:
      text = text.encode('utf-8')
  return MergeLines(
      text.split('\n'),
      message,
      allow_unknown_extension,
      allow_field_number,
      descriptor_pool=descriptor_pool)

def ParseLines(lines,
               message,
               allow_unknown_extension=False,
               allow_field_number=False,
               descriptor_pool=None):
  """Parses a text representation of a protocol message into a message.

Args:
    lines: An iterable of lines of a message's text representation.
    message: A protocol buffer message to merge into.
    allow_unknown_extension: if True, skip over missing extensions and keep
      parsing
    allow_field_number: if True, both field number and field name are allowed.
    descriptor_pool: A DescriptorPool used to resolve Any types.

Returns:
    The same message passed as argument.

Raises:
    ParseError: On text parsing problems.
  """
  parser = _Parser(allow_unknown_extension,
                   allow_field_number,
                   descriptor_pool=descriptor_pool)
  return parser.ParseLines(lines, message)

def MergeLines(lines,
               message,
               allow_unknown_extension=False,
               allow_field_number=False,
               descriptor_pool=None):
  """Parses a text representation of a protocol message into a message.

Returns:
    The same message passed as argument.

Raises:
    ParseError: On text parsing problems.
  """
  parser = _Parser(allow_unknown_extension,
                   allow_field_number,
                   descriptor_pool=descriptor_pool)
  return parser.MergeLines(lines, message)

class _Parser(object):
  """Text format parser for protocol message."""

def __init__(self,
               allow_unknown_extension=False,
               allow_field_number=False,
               descriptor_pool=None):
    self.allow_unknown_extension = allow_unknown_extension
    self.allow_field_number = allow_field_number
    self.descriptor_pool = descriptor_pool

def ParseFromString(self, text, message):
    """Parses a text representation of a protocol message into a message."""
    if not isinstance(text, str):
      text = text.decode('utf-8')
    return self.ParseLines(text.split('\n'), message)

def ParseLines(self, lines, message):
    """Parses a text representation of a protocol message into a message."""
    self._allow_multiple_scalars = False
    self._ParseOrMerge(lines, message)
    return message

def MergeFromString(self, text, message):
    """Merges a text representation of a protocol message into a message."""
    return self._MergeLines(text.split('\n'), message)

def MergeLines(self, lines, message):
    """Merges a text representation of a protocol message into a message."""
    self._allow_multiple_scalars = True
    self._ParseOrMerge(lines, message)
    return message

def _ParseOrMerge(self, lines, message):
    """Converts a text representation of a protocol message into a message.

Args:
      lines: Lines of a message's text representation.
      message: A protocol buffer message to merge into.

Raises:
      ParseError: On text parsing problems.
    """
    tokenizer = Tokenizer(lines)
    while not tokenizer.AtEnd():
      self._MergeField(tokenizer, message)

def _MergeField(self, tokenizer, message):
    """Merges a single protocol message field into a message.

Args:
      tokenizer: A tokenizer to parse the field name and values.
      message: A protocol message to record the data.

Raises:
      ParseError: In case of text parsing problems.
    """
    message_descriptor = message.DESCRIPTOR
    if tokenizer.TryConsume('['):
      name = [tokenizer.ConsumeIdentifier()]
      while tokenizer.TryConsume('.'):
        name.append(tokenizer.ConsumeIdentifier())
      name = '.'.join(name)

if not message_descriptor.is_extendable:
        raise tokenizer.ParseErrorPreviousToken(
            'Message type "%s" does not have extensions.' %
            message_descriptor.full_name)
      # pylint: disable=protected-access
      field = message.Extensions._FindExtensionByName(name)
      # pylint: enable=protected-access
      if not field:
        if self.allow_unknown_extension:
          field = None
        else:
          raise tokenizer.ParseErrorPreviousToken(
              'Extension "%s" not registered. '
              'Did you import the _pb2 module which defines it? '
              'If you are trying to place the extension in the MessageSet '
              'field of another message that is in an Any or MessageSet field, '
              'that message\'s _pb2 module must be imported as well' % name)
      elif message_descriptor != field.containing_type:
        raise tokenizer.ParseErrorPreviousToken(
            'Extension "%s" does not extend message type "%s".' %
            (name, message_descriptor.full_name))

tokenizer.Consume(']')

else:
      name = tokenizer.ConsumeIdentifierOrNumber()
      if self.allow_field_number and name.isdigit():
        number = ParseInteger(name, True, True)
        field = message_descriptor.fields_by_number.get(number, None)
        if not field and message_descriptor.is_extendable:
          field = message.Extensions._FindExtensionByNumber(number)
      else:
        field = message_descriptor.fields_by_name.get(name, None)

# Group names are expected to be capitalized as they appear in the
        # .proto file, which actually matches their type names, not their field
        # names.
        if not field:
          field = message_descriptor.fields_by_name.get(name.lower(), None)
          if field and field.type != descriptor.FieldDescriptor.TYPE_GROUP:
            field = None

if (field and field.type == descriptor.FieldDescriptor.TYPE_GROUP and
            field.message_type.name != name):
          field = None

if not field:
        raise tokenizer.ParseErrorPreviousToken(
            'Message type "%s" has no field named "%s".' %
            (message_descriptor.full_name, name))

if field:
      if not self._allow_multiple_scalars and field.containing_oneof:
        # Check if there's a different field set in this oneof.
        # Note that we ignore the case if the same field was set before, and we
        # apply _allow_multiple_scalars to non-scalar fields as well.
        which_oneof = message.WhichOneof(field.containing_oneof.name)
        if which_oneof is not None and which_oneof != field.name:
          raise tokenizer.ParseErrorPreviousToken(
              'Field "%s" is specified along with field "%s", another member '
              'of oneof "%s" for message type "%s".' %
              (field.name, which_oneof, field.containing_oneof.name,
               message_descriptor.full_name))

if field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE:
        tokenizer.TryConsume(':')
        merger = self._MergeMessageField
      else:
        tokenizer.Consume(':')
        merger = self._MergeScalarField

if (field.label == descriptor.FieldDescriptor.LABEL_REPEATED and
          tokenizer.TryConsume('[')):
        # Short repeated format, e.g. "foo: [1, 2, 3]"
        while True:
          merger(tokenizer, message, field)
          if tokenizer.TryConsume(']'):
            break
          tokenizer.Consume(',')

else:
        merger(tokenizer, message, field)

else:  # Proto field is unknown.
      assert self.allow_unknown_extension
      _SkipFieldContents(tokenizer)

# For historical reasons, fields may optionally be separated by commas or
    # semicolons.
    if not tokenizer.TryConsume(','):
      tokenizer.TryConsume(';')

def _ConsumeAnyTypeUrl(self, tokenizer):
    """Consumes a google.protobuf.Any type URL and returns the type name."""
    # Consume "type.googleapis.com/".
    prefix = [tokenizer.ConsumeIdentifier()]
    tokenizer.Consume('.')
    prefix.append(tokenizer.ConsumeIdentifier())
    tokenizer.Consume('.')
    prefix.append(tokenizer.ConsumeIdentifier())
    tokenizer.Consume('/')
    # Consume the fully-qualified type name.
    name = [tokenizer.ConsumeIdentifier()]
    while tokenizer.TryConsume('.'):
      name.append(tokenizer.ConsumeIdentifier())
    return '.'.join(prefix), '.'.join(name)

def _MergeMessageField(self, tokenizer, message, field):
    """Merges a single scalar field into a message.

Args:
      tokenizer: A tokenizer to parse the field value.
      message: The message of which field is a member.
      field: The descriptor of the field to be merged.

Raises:
      ParseError: In case of text parsing problems.
    """
    is_map_entry = _IsMapEntry(field)

if tokenizer.TryConsume('<'):
      end_token = '>'
    else:
      tokenizer.Consume('{')
      end_token = '}'

if (field.message_type.full_name == _ANY_FULL_TYPE_NAME and
        tokenizer.TryConsume('[')):
      type_url_prefix, packed_type_name = self._ConsumeAnyTypeUrl(tokenizer)
      tokenizer.Consume(']')
      tokenizer.TryConsume(':')
      if tokenizer.TryConsume('<'):
        expanded_any_end_token = '>'
      else:
        tokenizer.Consume('{')
        expanded_any_end_token = '}'
      expanded_any_sub_message = _BuildMessageFromTypeName(packed_type_name,
                                                           self.descriptor_pool)
      if not expanded_any_sub_message:
        raise ParseError('Type %s not found in descriptor pool' %
                         packed_type_name)
      while not tokenizer.TryConsume(expanded_any_end_token):
        if tokenizer.AtEnd():
          raise tokenizer.ParseErrorPreviousToken('Expected "%s".' %
                                                  (expanded_any_end_token,))
        self._MergeField(tokenizer, expanded_any_sub_message)
      if field.label == descriptor.FieldDescriptor.LABEL_REPEATED:
        any_message = getattr(message, field.name).add()
      else:
        any_message = getattr(message, field.name)
      any_message.Pack(expanded_any_sub_message,
                       type_url_prefix=type_url_prefix)
    elif field.label == descriptor.FieldDescriptor.LABEL_REPEATED:
      if field.is_extension:
        sub_message = message.Extensions[field].add()
      elif is_map_entry:
        sub_message = getattr(message, field.name).GetEntryClass()()
      else:
        sub_message = getattr(message, field.name).add()
    else:
      if field.is_extension:
        sub_message = message.Extensions[field]
      else:
        sub_message = getattr(message, field.name)
      sub_message.SetInParent()

while not tokenizer.TryConsume(end_token):
      if tokenizer.AtEnd():
        raise tokenizer.ParseErrorPreviousToken('Expected "%s".' % (end_token,))
      self._MergeField(tokenizer, sub_message)

if is_map_entry:
      value_cpptype = field.message_type.fields_by_name['value'].cpp_type
      if value_cpptype == descriptor.FieldDescriptor.CPPTYPE_MESSAGE:
        value = getattr(message, field.name)[sub_message.key]
        value.MergeFrom(sub_message.value)
      else:
        getattr(message, field.name)[sub_message.key] = sub_message.value

@staticmethod
  def _IsProto3Syntax(message):
    message_descriptor = message.DESCRIPTOR
    return (hasattr(message_descriptor, 'syntax') and
            message_descriptor.syntax == 'proto3')

def _MergeScalarField(self, tokenizer, message, field):
    """Merges a single scalar field into a message.

Args:
      tokenizer: A tokenizer to parse the field value.
      message: A protocol message to record the data.
      field: The descriptor of the field to be merged.

Raises:
      ParseError: In case of text parsing problems.
      RuntimeError: On runtime errors.
    """
    _ = self.allow_unknown_extension
    value = None

if field.type in (descriptor.FieldDescriptor.TYPE_INT32,
                      descriptor.FieldDescriptor.TYPE_SINT32,
                      descriptor.FieldDescriptor.TYPE_SFIXED32):
      value = _ConsumeInt32(tokenizer)
    elif field.type in (descriptor.FieldDescriptor.TYPE_INT64,
                        descriptor.FieldDescriptor.TYPE_SINT64,
                        descriptor.FieldDescriptor.TYPE_SFIXED64):
      value = _ConsumeInt64(tokenizer)
    elif field.type in (descriptor.FieldDescriptor.TYPE_UINT32,
                        descriptor.FieldDescriptor.TYPE_FIXED32):
      value = _ConsumeUint32(tokenizer)
    elif field.type in (descriptor.FieldDescriptor.TYPE_UINT64,
                        descriptor.FieldDescriptor.TYPE_FIXED64):
      value = _ConsumeUint64(tokenizer)
    elif field.type in (descriptor.FieldDescriptor.TYPE_FLOAT,
                        descriptor.FieldDescriptor.TYPE_DOUBLE):
      value = tokenizer.ConsumeFloat()
    elif field.type == descriptor.FieldDescriptor.TYPE_BOOL:
      value = tokenizer.ConsumeBool()
    elif field.type == descriptor.FieldDescriptor.TYPE_STRING:
      value = tokenizer.ConsumeString()
    elif field.type == descriptor.FieldDescriptor.TYPE_BYTES:
      value = tokenizer.ConsumeByteString()
    elif field.type == descriptor.FieldDescriptor.TYPE_ENUM:
      value = tokenizer.ConsumeEnum(field)
    else:
      raise RuntimeError('Unknown field type %d' % field.type)

if field.label == descriptor.FieldDescriptor.LABEL_REPEATED:
      if field.is_extension:
        message.Extensions[field].append(value)
      else:
        getattr(message, field.name).append(value)
    else:
      # Proto3 doesn't represent presence so we can't test if multiple scalars
      # have occurred. We have to allow them.
      can_check_presence = not self._IsProto3Syntax(message)
      if field.is_extension:
        if (not self._allow_multiple_scalars and can_check_presence and
            message.HasExtension(field)):
          raise tokenizer.ParseErrorPreviousToken(
              'Message type "%s" should not have multiple "%s" extensions.' %
              (message.DESCRIPTOR.full_name, field.full_name))
        else:
          message.Extensions[field] = value
      else:
        if (not self._allow_multiple_scalars and can_check_presence and
            message.HasField(field.name)):
          raise tokenizer.ParseErrorPreviousToken(
              'Message type "%s" should not have multiple "%s" fields.' %
              (message.DESCRIPTOR.full_name, field.name))
        else:
          setattr(message, field.name, value)

def _SkipFieldContents(tokenizer):
  """Skips over contents (value or message) of a field.

Args:
    tokenizer: A tokenizer to parse the field name and values.
  """
  # Try to guess the type of this field.
  # If this field is not a message, there should be a ":" between the
  # field name and the field value and also the field value should not
  # start with "{" or "<" which indicates the beginning of a message body.
  # If there is no ":" or there is a "{" or "<" after ":", this field has
  # to be a message or the input is ill-formed.
  if tokenizer.TryConsume(':') and not tokenizer.LookingAt(
      '{') and not tokenizer.LookingAt('<'):
    _SkipFieldValue(tokenizer)
  else:
    _SkipFieldMessage(tokenizer)

def _SkipField(tokenizer):
  """Skips over a complete field (name and value/message).

Args:
    tokenizer: A tokenizer to parse the field name and values.
  """
  if tokenizer.TryConsume('['):
    # Consume extension name.
    tokenizer.ConsumeIdentifier()
    while tokenizer.TryConsume('.'):
      tokenizer.ConsumeIdentifier()
    tokenizer.Consume(']')
  else:
    tokenizer.ConsumeIdentifier()

_SkipFieldContents(tokenizer)

# For historical reasons, fields may optionally be separated by commas or
  # semicolons.
  if not tokenizer.TryConsume(','):
    tokenizer.TryConsume(';')

def _SkipFieldMessage(tokenizer):
  """Skips over a field message.

Args:
    tokenizer: A tokenizer to parse the field name and values.
  """

if tokenizer.TryConsume('<'):
    delimiter = '>'
  else:
    tokenizer.Consume('{')
    delimiter = '}'

while not tokenizer.LookingAt('>') and not tokenizer.LookingAt('}'):
    _SkipField(tokenizer)

tokenizer.Consume(delimiter)

def _SkipFieldValue(tokenizer):
  """Skips over a field value.

Args:
    tokenizer: A tokenizer to parse the field name and values.

Raises:
    ParseError: In case an invalid field value is found.
  """
  # String/bytes tokens can come in multiple adjacent string literals.
  # If we can consume one, consume as many as we can.
  if tokenizer.TryConsumeByteString():
    while tokenizer.TryConsumeByteString():
      pass
    return

if (not tokenizer.TryConsumeIdentifier() and
      not _TryConsumeInt64(tokenizer) and not _TryConsumeUint64(tokenizer) and
      not tokenizer.TryConsumeFloat()):
    raise ParseError('Invalid field value: ' + tokenizer.token)

class Tokenizer(object):
  """Protocol buffer text representation tokenizer.

This class handles the lower level string parsing by splitting it into
  meaningful tokens.

It was directly ported from the Java protocol buffer API.
  """

_WHITESPACE = re.compile(r'\s+')
  _COMMENT = re.compile(r'(\s*#.*$)', re.MULTILINE)
  _WHITESPACE_OR_COMMENT = re.compile(r'(\s|(#.*$))+', re.MULTILINE)
  _TOKEN = re.compile('|'.join([
      r'[a-zA-Z_][0-9a-zA-Z_+-]*',  # an identifier
      r'([0-9+-]|(\.[0-9]))[0-9a-zA-Z_.+-]*',  # a number
  ] + [  # quoted str for each quote mark
      r'{qt}([^{qt}\n\\]|\\.)*({qt}|\\?$)'.format(qt=mark) for mark in _QUOTES
  ]))

_IDENTIFIER = re.compile(r'[^\d\W]\w*')
  _IDENTIFIER_OR_NUMBER = re.compile(r'\w+')

def __init__(self, lines, skip_comments=True):
    self._position = 0
    self._line = -1
    self._column = 0
    self._token_start = None
    self.token = ''
    self._lines = iter(lines)
    self._current_line = ''
    self._previous_line = 0
    self._previous_column = 0
    self._more_lines = True
    self._skip_comments = skip_comments
    self._whitespace_pattern = (skip_comments and self._WHITESPACE_OR_COMMENT
                                or self._WHITESPACE)
    self._SkipWhitespace()
    self.NextToken()

def LookingAt(self, token):
    return self.token == token

def AtEnd(self):
    """Checks the end of the text was reached.

Returns:
      True iff the end was reached.
    """
    return not self.token

def _PopLine(self):
    while len(self._current_line) <= self._column:
      try:
        self._current_line = next(self._lines)
      except StopIteration:
        self._current_line = ''
        self._more_lines = False
        return
      else:
        self._line += 1
        self._column = 0

def _SkipWhitespace(self):
    while True:
      self._PopLine()
      match = self._whitespace_pattern.match(self._current_line, self._column)
      if not match:
        break
      length = len(match.group(0))
      self._column += length

def TryConsume(self, token):
    """Tries to consume a given piece of text.

Args:
      token: Text to consume.

Returns:
      True iff the text was consumed.
    """
    if self.token == token:
      self.NextToken()
      return True
    return False

def Consume(self, token):
    """Consumes a piece of text.

Args:
      token: Text to consume.

Raises:
      ParseError: If the text couldn't be consumed.
    """
    if not self.TryConsume(token):
      raise self.ParseError('Expected "%s".' % token)

def ConsumeComment(self):
    result = self.token
    if not self._COMMENT.match(result):
      raise self.ParseError('Expected comment.')
    self.NextToken()
    return result

def ConsumeCommentOrTrailingComment(self):
    """Consumes a comment, returns a 2-tuple (trailing bool, comment str)."""

# Tokenizer initializes _previous_line and _previous_column to 0. As the
    # tokenizer starts, it looks like there is a previous token on the line.
    just_started = self._line == 0 and self._column == 0

before_parsing = self._previous_line
    comment = self.ConsumeComment()

# A trailing comment is a comment on the same line than the previous token.
    trailing = (self._previous_line == before_parsing
                and not just_started)

return trailing, comment

def TryConsumeIdentifier(self):
    try:
      self.ConsumeIdentifier()
      return True
    except ParseError:
      return False

def ConsumeIdentifier(self):
    """Consumes protocol message field identifier.

Returns:
      Identifier string.

Raises:
      ParseError: If an identifier couldn't be consumed.
    """
    result = self.token
    if not self._IDENTIFIER.match(result):
      raise self.ParseError('Expected identifier.')
    self.NextToken()
    return result

def TryConsumeIdentifierOrNumber(self):
    try:
      self.ConsumeIdentifierOrNumber()
      return True
    except ParseError:
      return False

def ConsumeIdentifierOrNumber(self):
    """Consumes protocol message field identifier.

Returns:
      Identifier string.

Raises:
      ParseError: If an identifier couldn't be consumed.
    """
    result = self.token
    if not self._IDENTIFIER_OR_NUMBER.match(result):
      raise self.ParseError('Expected identifier or number, got %s.' % result)
    self.NextToken()
    return result

def TryConsumeInteger(self):
    try:
      # Note: is_long only affects value type, not whether an error is raised.
      self.ConsumeInteger()
      return True
    except ParseError:
      return False

def ConsumeInteger(self, is_long=False):
    """Consumes an integer number.

Args:
      is_long: True if the value should be returned as a long integer.
    Returns:
      The integer parsed.

Raises:
      ParseError: If an integer couldn't be consumed.
    """
    try:
      result = _ParseAbstractInteger(self.token, is_long=is_long)
    except ValueError as e:
      raise self.ParseError(str(e))
    self.NextToken()
    return result

def TryConsumeFloat(self):
    try:
      self.ConsumeFloat()
      return True
    except ParseError:
      return False

def ConsumeFloat(self):
    """Consumes an floating point number.

Returns:
      The number parsed.

Raises:
      ParseError: If a floating point number couldn't be consumed.
    """
    try:
      result = ParseFloat(self.token)
    except ValueError as e:
      raise self.ParseError(str(e))
    self.NextToken()
    return result

def ConsumeBool(self):
    """Consumes a boolean value.

Returns:
      The bool parsed.

Raises:
      ParseError: If a boolean value couldn't be consumed.
    """
    try:
      result = ParseBool(self.token)
    except ValueError as e:
      raise self.ParseError(str(e))
    self.NextToken()
    return result

def TryConsumeByteString(self):
    try:
      self.ConsumeByteString()
      return True
    except ParseError:
      return False

def ConsumeString(self):
    """Consumes a string value.

Returns:
      The string parsed.

Raises:
      ParseError: If a string value couldn't be consumed.
    """
    the_bytes = self.ConsumeByteString()
    try:
      return six.text_type(the_bytes, 'utf-8')
    except UnicodeDecodeError as e:
      raise self._StringParseError(e)

def ConsumeByteString(self):
    """Consumes a byte array value.

Returns:
      The array parsed (as a string).

Raises:
      ParseError: If a byte array value couldn't be consumed.
    """
    the_list = [self._ConsumeSingleByteString()]
    while self.token and self.token[0] in _QUOTES:
      the_list.append(self._ConsumeSingleByteString())
    return b''.join(the_list)

def _ConsumeSingleByteString(self):
    """Consume one token of a string literal.

String literals (whether bytes or text) can come in multiple adjacent
    tokens which are automatically concatenated, like in C or Python.  This
    method only consumes one token.

Returns:
      The token parsed.
    Raises:
      ParseError: When the wrong format data is found.
    """
    text = self.token
    if len(text) < 1 or text[0] not in _QUOTES:
      raise self.ParseError('Expected string but found: %r' % (text,))

if len(text) < 2 or text[-1] != text[0]:
      raise self.ParseError('String missing ending quote: %r' % (text,))

try:
      result = text_encoding.CUnescape(text[1:-1])
    except ValueError as e:
      raise self.ParseError(str(e))
    self.NextToken()
    return result

def ConsumeEnum(self, field):
    try:
      result = ParseEnum(field, self.token)
    except ValueError as e:
      raise self.ParseError(str(e))
    self.NextToken()
    return result

def ParseErrorPreviousToken(self, message):
    """Creates and *returns* a ParseError for the previously read token.

Args:
      message: A message to set for the exception.

Returns:
      A ParseError instance.
    """
    return ParseError(message, self._previous_line + 1,
                      self._previous_column + 1)

def ParseError(self, message):
    """Creates and *returns* a ParseError for the current token."""
    return ParseError(message, self._line + 1, self._column + 1)

def _StringParseError(self, e):
    return self.ParseError('Couldn\'t parse string: ' + str(e))

def NextToken(self):
    """Reads the next meaningful token."""
    self._previous_line = self._line
    self._previous_column = self._column

self._column += len(self.token)
    self._SkipWhitespace()

if not self._more_lines:
      self.token = ''
      return

match = self._TOKEN.match(self._current_line, self._column)
    if not match and not self._skip_comments:
      match = self._COMMENT.match(self._current_line, self._column)
    if match:
      token = match.group(0)
      self.token = token
    else:
      self.token = self._current_line[self._column]

# Aliased so it can still be accessed by current visibility violators.
# TODO(dbarnett): Migrate violators to textformat_tokenizer.
_Tokenizer = Tokenizer  # pylint: disable=invalid-name

def _ConsumeInt32(tokenizer):
  """Consumes a signed 32bit integer number from tokenizer.

Args:
    tokenizer: A tokenizer used to parse the number.