| # 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 |
| |
| 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(("'", '"')) |
| |
| |
| class Error(Exception): |
| """Top-level module error for text_format.""" |
| |
| |
| class ParseError(Error): |
| """Thrown in case of text parsing error.""" |
| |
| |
| 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): |
| """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. |
| |
| Returns: |
| A string of the text formatted protocol buffer message. |
| """ |
| out = TextWriter(as_utf8) |
| printer = _Printer(out, 0, as_utf8, as_one_line, |
| pointy_brackets, use_index_order, float_format, |
| use_field_number) |
| 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): |
| printer = _Printer(out, indent, as_utf8, as_one_line, |
| pointy_brackets, use_index_order, float_format, |
| use_field_number) |
| 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): |
| """Print a single field name/value pair.""" |
| printer = _Printer(out, indent, as_utf8, as_one_line, |
| pointy_brackets, use_index_order, float_format) |
| 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): |
| """Print a single field value (not including name).""" |
| printer = _Printer(out, indent, as_utf8, as_one_line, |
| pointy_brackets, use_index_order, float_format) |
| printer.PrintFieldValue(field, value) |
| |
| |
| 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): |
| """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. |
| """ |
| 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 |
| |
| def PrintMessage(self, message): |
| """Convert protobuf message to text format. |
| |
| Args: |
| message: The protocol buffers message. |
| """ |
| 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 = field.message_type._concrete_class( |
| 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 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 self.pointy_brackets: |
| openb = '<' |
| closeb = '>' |
| else: |
| openb = '{' |
| closeb = '}' |
| |
| if field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE: |
| if self.as_one_line: |
| out.write(' %s ' % openb) |
| self.PrintMessage(value) |
| out.write(closeb) |
| else: |
| out.write(' %s\n' % openb) |
| self.indent += 2 |
| self.PrintMessage(value) |
| self.indent -= 2 |
| out.write(' ' * self.indent + closeb) |
| 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): |
| """Parses an text representation of a protocol message into a message. |
| |
| 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. |
| |
| Returns: |
| The same message passed as argument. |
| |
| Raises: |
| ParseError: On text parsing problems. |
| """ |
| if not isinstance(text, str): |
| text = text.decode('utf-8') |
| return ParseLines(text.split('\n'), message, allow_unknown_extension, |
| allow_field_number) |
| |
| |
| def Merge(text, message, allow_unknown_extension=False, |
| allow_field_number=False): |
| """Parses an 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. |
| |
| 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. |
| |
| Returns: |
| The same message passed as argument. |
| |
| Raises: |
| ParseError: On text parsing problems. |
| """ |
| return MergeLines(text.split('\n'), message, allow_unknown_extension, |
| allow_field_number) |
| |
| |
| def ParseLines(lines, message, allow_unknown_extension=False, |
| allow_field_number=False): |
| """Parses an 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. |
| |
| Returns: |
| The same message passed as argument. |
| |
| Raises: |
| ParseError: On text parsing problems. |
| """ |
| parser = _Parser(allow_unknown_extension, allow_field_number) |
| return parser.ParseLines(lines, message) |
| |
| |
| def MergeLines(lines, message, allow_unknown_extension=False, |
| allow_field_number=False): |
| """Parses an 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. |
| |
| Returns: |
| The same message passed as argument. |
| |
| Raises: |
| ParseError: On text parsing problems. |
| """ |
| parser = _Parser(allow_unknown_extension, allow_field_number) |
| 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): |
| self.allow_unknown_extension = allow_unknown_extension |
| self.allow_field_number = allow_field_number |
| |
| def ParseFromString(self, text, message): |
| """Parses an 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 an 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 an text representation of a protocol message into a message.""" |
| return self._MergeLines(text.split('\n'), message) |
| |
| def MergeLines(self, lines, message): |
| """Merges an 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 an 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 (hasattr(message_descriptor, 'syntax') and |
| message_descriptor.syntax == 'proto3'): |
| # Proto3 doesn't represent presence so we can't test if multiple |
| # scalars have occurred. We have to allow them. |
| self._allow_multiple_scalars = True |
| 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.' % 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.ConsumeIdentifier() |
| 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 _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.label == descriptor.FieldDescriptor.LABEL_REPEATED: |
| if field.is_extension: |
| sub_message = message.Extensions[field].add() |
| elif is_map_entry: |
| # pylint: disable=protected-access |
| sub_message = field.message_type._concrete_class() |
| 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 |
| |
| 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 = tokenizer.ConsumeInt32() |
| elif field.type in (descriptor.FieldDescriptor.TYPE_INT64, |
| descriptor.FieldDescriptor.TYPE_SINT64, |
| descriptor.FieldDescriptor.TYPE_SFIXED64): |
| value = tokenizer.ConsumeInt64() |
| elif field.type in (descriptor.FieldDescriptor.TYPE_UINT32, |
| descriptor.FieldDescriptor.TYPE_FIXED32): |
| value = tokenizer.ConsumeUint32() |
| elif field.type in (descriptor.FieldDescriptor.TYPE_UINT64, |
| descriptor.FieldDescriptor.TYPE_FIXED64): |
| value = tokenizer.ConsumeUint64() |
| 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: |
| if field.is_extension: |
| if not self._allow_multiple_scalars 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 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 tokenizer.TryConsumeInt64() and |
| not tokenizer.TryConsumeUint64() 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('(\\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'\w+') |
| |
| def __init__(self, lines): |
| 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._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.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 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 ConsumeInt32(self): |
| """Consumes a signed 32bit integer number. |
| |
| Returns: |
| The integer parsed. |
| |
| Raises: |
| ParseError: If a signed 32bit integer couldn't be consumed. |
| """ |
| try: |
| result = ParseInteger(self.token, is_signed=True, is_long=False) |
| except ValueError as e: |
| raise self._ParseError(str(e)) |
| self.NextToken() |
| return result |
| |
| def ConsumeUint32(self): |
| """Consumes an unsigned 32bit integer number. |
| |
| Returns: |
| The integer parsed. |
| |
| Raises: |
| ParseError: If an unsigned 32bit integer couldn't be consumed. |
| """ |
| try: |
| result = ParseInteger(self.token, is_signed=False, is_long=False) |
| except ValueError as e: |
| raise self._ParseError(str(e)) |
| self.NextToken() |
| return result |
| |
| def TryConsumeInt64(self): |
| try: |
| self.ConsumeInt64() |
| return True |
| except ParseError: |
| return False |
| |
| def ConsumeInt64(self): |
| """Consumes a signed 64bit integer number. |
| |
| Returns: |
| The integer parsed. |
| |
| Raises: |
| ParseError: If a signed 64bit integer couldn't be consumed. |
| """ |
| try: |
| result = ParseInteger(self.token, is_signed=True, is_long=True) |
| except ValueError as e: |
| raise self._ParseError(str(e)) |
| self.NextToken() |
| return result |
| |
| def TryConsumeUint64(self): |
| try: |
| self.ConsumeUint64() |
| return True |
| except ParseError: |
| return False |
| |
| def ConsumeUint64(self): |
| """Consumes an unsigned 64bit integer number. |
| |
| Returns: |
| The integer parsed. |
| |
| Raises: |
| ParseError: If an unsigned 64bit integer couldn't be consumed. |
| """ |
| try: |
| result = ParseInteger(self.token, is_signed=False, is_long=True) |
| 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('%d:%d : %s' % ( |
| self._previous_line + 1, self._previous_column + 1, message)) |
| |
| def _ParseError(self, message): |
| """Creates and *returns* a ParseError for the current token.""" |
| return ParseError('%d:%d : %s' % ( |
| self._line + 1, self._column + 1, message)) |
| |
| 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 match: |
| token = match.group(0) |
| self.token = token |
| else: |
| self.token = self._current_line[self._column] |
| |
| |
| def ParseInteger(text, is_signed=False, is_long=False): |
| """Parses an integer. |
| |
| Args: |
| text: The text to parse. |
| is_signed: True if a signed integer must be parsed. |
| is_long: True if a long integer must be parsed. |
| |
| Returns: |
| The integer value. |
| |
| Raises: |
| ValueError: Thrown Iff the text is not a valid integer. |
| """ |
| # Do the actual parsing. Exception handling is propagated to caller. |
| try: |
| # We force 32-bit values to int and 64-bit values to long to make |
| # alternate implementations where the distinction is more significant |
| # (e.g. the C++ implementation) simpler. |
| if is_long: |
| result = long(text, 0) |
| else: |
| result = int(text, 0) |
| except ValueError: |
| raise ValueError('Couldn\'t parse integer: %s' % text) |
| |
| # Check if the integer is sane. Exceptions handled by callers. |
| checker = _INTEGER_CHECKERS[2 * int(is_long) + int(is_signed)] |
| checker.CheckValue(result) |
| return result |
| |
| |
| def ParseFloat(text): |
| """Parse a floating point number. |
| |
| Args: |
| text: Text to parse. |
| |
| Returns: |
| The number parsed. |
| |
| Raises: |
| ValueError: If a floating point number couldn't be parsed. |
| """ |
| try: |
| # Assume Python compatible syntax. |
| return float(text) |
| except ValueError: |
| # Check alternative spellings. |
| if _FLOAT_INFINITY.match(text): |
| if text[0] == '-': |
| return float('-inf') |
| else: |
| return float('inf') |
| elif _FLOAT_NAN.match(text): |
| return float('nan') |
| else: |
| # assume '1.0f' format |
| try: |
| return float(text.rstrip('f')) |
| except ValueError: |
| raise ValueError('Couldn\'t parse float: %s' % text) |
| |
| |
| def ParseBool(text): |
| """Parse a boolean value. |
| |
| Args: |
| text: Text to parse. |
| |
| Returns: |
| Boolean values parsed |
| |
| Raises: |
| ValueError: If text is not a valid boolean. |
| """ |
| if text in ('true', 't', '1'): |
| return True |
| elif text in ('false', 'f', '0'): |
| return False |
| else: |
| raise ValueError('Expected "true" or "false".') |
| |
| |
| def ParseEnum(field, value): |
| """Parse an enum value. |
| |
| The value can be specified by a number (the enum value), or by |
| a string literal (the enum name). |
| |
| Args: |
| field: Enum field descriptor. |
| value: String value. |
| |
| Returns: |
| Enum value number. |
| |
| Raises: |
| ValueError: If the enum value could not be parsed. |
| """ |
| enum_descriptor = field.enum_type |
| try: |
| number = int(value, 0) |
| except ValueError: |
| # Identifier. |
| enum_value = enum_descriptor.values_by_name.get(value, None) |
| if enum_value is None: |
| raise ValueError( |
| 'Enum type "%s" has no value named %s.' % ( |
| enum_descriptor.full_name, value)) |
| else: |
| # Numeric value. |
| enum_value = enum_descriptor.values_by_number.get(number, None) |
| if enum_value is None: |
| raise ValueError( |
| 'Enum type "%s" has no value with number %d.' % ( |
| enum_descriptor.full_name, number)) |
| return enum_value.number |
