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874 lines
26 KiB
Python
874 lines
26 KiB
Python
# Protocol Buffers - Google's data interchange format
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# Copyright 2008 Google Inc. All rights reserved.
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# http://code.google.com/p/protobuf/
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following disclaimer
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# in the documentation and/or other materials provided with the
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# distribution.
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# * Neither the name of Google Inc. nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#PY25 compatible for GAE.
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#
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# Copyright 2007 Google Inc. All Rights Reserved.
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"""Contains routines for printing protocol messages in text format."""
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__author__ = 'kenton@google.com (Kenton Varda)'
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import cStringIO
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import re
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from protobuf26.internal import type_checkers
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from protobuf26 import descriptor
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from protobuf26 import text_encoding
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__all__ = ['MessageToString', 'PrintMessage', 'PrintField',
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'PrintFieldValue', 'Merge']
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_INTEGER_CHECKERS = (type_checkers.Uint32ValueChecker(),
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type_checkers.Int32ValueChecker(),
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type_checkers.Uint64ValueChecker(),
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type_checkers.Int64ValueChecker())
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_FLOAT_INFINITY = re.compile('-?inf(?:inity)?f?', re.IGNORECASE)
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_FLOAT_NAN = re.compile('nanf?', re.IGNORECASE)
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_FLOAT_TYPES = frozenset([descriptor.FieldDescriptor.CPPTYPE_FLOAT,
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descriptor.FieldDescriptor.CPPTYPE_DOUBLE])
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class Error(Exception):
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"""Top-level module error for text_format."""
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class ParseError(Error):
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"""Thrown in case of ASCII parsing error."""
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def MessageToString(message, as_utf8=False, as_one_line=False,
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pointy_brackets=False, use_index_order=False,
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float_format=None):
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"""Convert protobuf message to text format.
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Floating point values can be formatted compactly with 15 digits of
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precision (which is the most that IEEE 754 "double" can guarantee)
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using float_format='.15g'.
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Args:
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message: The protocol buffers message.
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as_utf8: Produce text output in UTF8 format.
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as_one_line: Don't introduce newlines between fields.
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pointy_brackets: If True, use angle brackets instead of curly braces for
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nesting.
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use_index_order: If True, print fields of a proto message using the order
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defined in source code instead of the field number. By default, use the
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field number order.
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float_format: If set, use this to specify floating point number formatting
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(per the "Format Specification Mini-Language"); otherwise, str() is used.
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Returns:
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A string of the text formatted protocol buffer message.
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"""
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out = cStringIO.StringIO()
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PrintMessage(message, out, as_utf8=as_utf8, as_one_line=as_one_line,
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pointy_brackets=pointy_brackets,
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use_index_order=use_index_order,
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float_format=float_format)
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result = out.getvalue()
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out.close()
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if as_one_line:
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return result.rstrip()
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return result
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def PrintMessage(message, out, indent=0, as_utf8=False, as_one_line=False,
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pointy_brackets=False, use_index_order=False,
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float_format=None):
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fields = message.ListFields()
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if use_index_order:
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fields.sort(key=lambda x: x[0].index)
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for field, value in fields:
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if field.label == descriptor.FieldDescriptor.LABEL_REPEATED:
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for element in value:
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PrintField(field, element, out, indent, as_utf8, as_one_line,
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pointy_brackets=pointy_brackets,
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float_format=float_format)
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else:
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PrintField(field, value, out, indent, as_utf8, as_one_line,
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pointy_brackets=pointy_brackets,
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float_format=float_format)
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def PrintField(field, value, out, indent=0, as_utf8=False, as_one_line=False,
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pointy_brackets=False, float_format=None):
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"""Print a single field name/value pair. For repeated fields, the value
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should be a single element."""
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out.write(' ' * indent)
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if field.is_extension:
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out.write('[')
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if (field.containing_type.GetOptions().message_set_wire_format and
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field.type == descriptor.FieldDescriptor.TYPE_MESSAGE and
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field.message_type == field.extension_scope and
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field.label == descriptor.FieldDescriptor.LABEL_OPTIONAL):
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out.write(field.message_type.full_name)
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else:
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out.write(field.full_name)
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out.write(']')
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elif field.type == descriptor.FieldDescriptor.TYPE_GROUP:
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# For groups, use the capitalized name.
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out.write(field.message_type.name)
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else:
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out.write(field.name)
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if field.cpp_type != descriptor.FieldDescriptor.CPPTYPE_MESSAGE:
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# The colon is optional in this case, but our cross-language golden files
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# don't include it.
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out.write(': ')
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PrintFieldValue(field, value, out, indent, as_utf8, as_one_line,
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pointy_brackets=pointy_brackets,
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float_format=float_format)
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if as_one_line:
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out.write(' ')
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else:
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out.write('\n')
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def PrintFieldValue(field, value, out, indent=0, as_utf8=False,
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as_one_line=False, pointy_brackets=False,
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float_format=None):
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"""Print a single field value (not including name). For repeated fields,
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the value should be a single element."""
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if pointy_brackets:
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openb = '<'
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closeb = '>'
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else:
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openb = '{'
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closeb = '}'
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if field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE:
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if as_one_line:
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out.write(' %s ' % openb)
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PrintMessage(value, out, indent, as_utf8, as_one_line,
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pointy_brackets=pointy_brackets,
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float_format=float_format)
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out.write(closeb)
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else:
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out.write(' %s\n' % openb)
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PrintMessage(value, out, indent + 2, as_utf8, as_one_line,
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pointy_brackets=pointy_brackets,
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float_format=float_format)
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out.write(' ' * indent + closeb)
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elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_ENUM:
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enum_value = field.enum_type.values_by_number.get(value, None)
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if enum_value is not None:
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out.write(enum_value.name)
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else:
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out.write(str(value))
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elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_STRING:
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out.write('\"')
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if isinstance(value, unicode):
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out_value = value.encode('utf-8')
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else:
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out_value = value
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if field.type == descriptor.FieldDescriptor.TYPE_BYTES:
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# We need to escape non-UTF8 chars in TYPE_BYTES field.
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out_as_utf8 = False
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else:
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out_as_utf8 = as_utf8
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out.write(text_encoding.CEscape(out_value, out_as_utf8))
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out.write('\"')
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elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_BOOL:
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if value:
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out.write('true')
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else:
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out.write('false')
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elif field.cpp_type in _FLOAT_TYPES and float_format is not None:
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out.write('{1:{0}}'.format(float_format, value))
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else:
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out.write(str(value))
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def _ParseOrMerge(lines, message, allow_multiple_scalars):
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"""Converts an ASCII representation of a protocol message into a message.
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Args:
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lines: Lines of a message's ASCII representation.
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message: A protocol buffer message to merge into.
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allow_multiple_scalars: Determines if repeated values for a non-repeated
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field are permitted, e.g., the string "foo: 1 foo: 2" for a
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required/optional field named "foo".
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Raises:
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ParseError: On ASCII parsing problems.
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"""
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tokenizer = _Tokenizer(lines)
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while not tokenizer.AtEnd():
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_MergeField(tokenizer, message, allow_multiple_scalars)
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def Parse(text, message):
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"""Parses an ASCII representation of a protocol message into a message.
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Args:
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text: Message ASCII representation.
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message: A protocol buffer message to merge into.
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Returns:
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The same message passed as argument.
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Raises:
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ParseError: On ASCII parsing problems.
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"""
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if not isinstance(text, str): text = text.decode('utf-8')
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return ParseLines(text.split('\n'), message)
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def Merge(text, message):
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"""Parses an ASCII representation of a protocol message into a message.
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Like Parse(), but allows repeated values for a non-repeated field, and uses
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the last one.
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Args:
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text: Message ASCII representation.
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message: A protocol buffer message to merge into.
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Returns:
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The same message passed as argument.
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Raises:
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ParseError: On ASCII parsing problems.
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"""
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return MergeLines(text.split('\n'), message)
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def ParseLines(lines, message):
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"""Parses an ASCII representation of a protocol message into a message.
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Args:
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lines: An iterable of lines of a message's ASCII representation.
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message: A protocol buffer message to merge into.
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Returns:
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The same message passed as argument.
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Raises:
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ParseError: On ASCII parsing problems.
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"""
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_ParseOrMerge(lines, message, False)
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return message
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def MergeLines(lines, message):
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"""Parses an ASCII representation of a protocol message into a message.
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Args:
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lines: An iterable of lines of a message's ASCII representation.
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message: A protocol buffer message to merge into.
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Returns:
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The same message passed as argument.
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Raises:
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ParseError: On ASCII parsing problems.
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"""
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_ParseOrMerge(lines, message, True)
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return message
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def _MergeField(tokenizer, message, allow_multiple_scalars):
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"""Merges a single protocol message field into a message.
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Args:
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tokenizer: A tokenizer to parse the field name and values.
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message: A protocol message to record the data.
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allow_multiple_scalars: Determines if repeated values for a non-repeated
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field are permitted, e.g., the string "foo: 1 foo: 2" for a
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required/optional field named "foo".
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Raises:
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ParseError: In case of ASCII parsing problems.
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"""
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message_descriptor = message.DESCRIPTOR
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if tokenizer.TryConsume('['):
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name = [tokenizer.ConsumeIdentifier()]
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while tokenizer.TryConsume('.'):
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name.append(tokenizer.ConsumeIdentifier())
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name = '.'.join(name)
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if not message_descriptor.is_extendable:
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raise tokenizer.ParseErrorPreviousToken(
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'Message type "%s" does not have extensions.' %
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message_descriptor.full_name)
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# pylint: disable=protected-access
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field = message.Extensions._FindExtensionByName(name)
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# pylint: enable=protected-access
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if not field:
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raise tokenizer.ParseErrorPreviousToken(
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'Extension "%s" not registered.' % name)
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elif message_descriptor != field.containing_type:
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raise tokenizer.ParseErrorPreviousToken(
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'Extension "%s" does not extend message type "%s".' % (
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name, message_descriptor.full_name))
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tokenizer.Consume(']')
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else:
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name = tokenizer.ConsumeIdentifier()
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field = message_descriptor.fields_by_name.get(name, None)
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# Group names are expected to be capitalized as they appear in the
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# .proto file, which actually matches their type names, not their field
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# names.
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if not field:
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field = message_descriptor.fields_by_name.get(name.lower(), None)
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if field and field.type != descriptor.FieldDescriptor.TYPE_GROUP:
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field = None
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if (field and field.type == descriptor.FieldDescriptor.TYPE_GROUP and
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field.message_type.name != name):
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field = None
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if not field:
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raise tokenizer.ParseErrorPreviousToken(
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'Message type "%s" has no field named "%s".' % (
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message_descriptor.full_name, name))
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if field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE:
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tokenizer.TryConsume(':')
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if tokenizer.TryConsume('<'):
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end_token = '>'
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else:
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tokenizer.Consume('{')
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end_token = '}'
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if field.label == descriptor.FieldDescriptor.LABEL_REPEATED:
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if field.is_extension:
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sub_message = message.Extensions[field].add()
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else:
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sub_message = getattr(message, field.name).add()
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else:
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if field.is_extension:
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sub_message = message.Extensions[field]
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else:
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sub_message = getattr(message, field.name)
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sub_message.SetInParent()
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while not tokenizer.TryConsume(end_token):
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if tokenizer.AtEnd():
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raise tokenizer.ParseErrorPreviousToken('Expected "%s".' % (end_token))
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_MergeField(tokenizer, sub_message, allow_multiple_scalars)
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else:
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_MergeScalarField(tokenizer, message, field, allow_multiple_scalars)
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# For historical reasons, fields may optionally be separated by commas or
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# semicolons.
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if not tokenizer.TryConsume(','):
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tokenizer.TryConsume(';')
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def _MergeScalarField(tokenizer, message, field, allow_multiple_scalars):
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"""Merges a single protocol message scalar field into a message.
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Args:
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tokenizer: A tokenizer to parse the field value.
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message: A protocol message to record the data.
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field: The descriptor of the field to be merged.
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allow_multiple_scalars: Determines if repeated values for a non-repeated
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field are permitted, e.g., the string "foo: 1 foo: 2" for a
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required/optional field named "foo".
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Raises:
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ParseError: In case of ASCII parsing problems.
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RuntimeError: On runtime errors.
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"""
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tokenizer.Consume(':')
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value = None
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if field.type in (descriptor.FieldDescriptor.TYPE_INT32,
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descriptor.FieldDescriptor.TYPE_SINT32,
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descriptor.FieldDescriptor.TYPE_SFIXED32):
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value = tokenizer.ConsumeInt32()
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elif field.type in (descriptor.FieldDescriptor.TYPE_INT64,
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descriptor.FieldDescriptor.TYPE_SINT64,
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descriptor.FieldDescriptor.TYPE_SFIXED64):
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value = tokenizer.ConsumeInt64()
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elif field.type in (descriptor.FieldDescriptor.TYPE_UINT32,
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descriptor.FieldDescriptor.TYPE_FIXED32):
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value = tokenizer.ConsumeUint32()
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elif field.type in (descriptor.FieldDescriptor.TYPE_UINT64,
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descriptor.FieldDescriptor.TYPE_FIXED64):
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value = tokenizer.ConsumeUint64()
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elif field.type in (descriptor.FieldDescriptor.TYPE_FLOAT,
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descriptor.FieldDescriptor.TYPE_DOUBLE):
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value = tokenizer.ConsumeFloat()
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elif field.type == descriptor.FieldDescriptor.TYPE_BOOL:
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value = tokenizer.ConsumeBool()
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elif field.type == descriptor.FieldDescriptor.TYPE_STRING:
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value = tokenizer.ConsumeString()
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elif field.type == descriptor.FieldDescriptor.TYPE_BYTES:
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value = tokenizer.ConsumeByteString()
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elif field.type == descriptor.FieldDescriptor.TYPE_ENUM:
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value = tokenizer.ConsumeEnum(field)
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else:
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raise RuntimeError('Unknown field type %d' % field.type)
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if field.label == descriptor.FieldDescriptor.LABEL_REPEATED:
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if field.is_extension:
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message.Extensions[field].append(value)
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else:
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getattr(message, field.name).append(value)
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else:
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if field.is_extension:
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if not allow_multiple_scalars and message.HasExtension(field):
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raise tokenizer.ParseErrorPreviousToken(
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'Message type "%s" should not have multiple "%s" extensions.' %
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(message.DESCRIPTOR.full_name, field.full_name))
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else:
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message.Extensions[field] = value
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else:
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if not allow_multiple_scalars and message.HasField(field.name):
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raise tokenizer.ParseErrorPreviousToken(
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'Message type "%s" should not have multiple "%s" fields.' %
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(message.DESCRIPTOR.full_name, field.name))
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else:
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setattr(message, field.name, value)
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class _Tokenizer(object):
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"""Protocol buffer ASCII representation tokenizer.
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This class handles the lower level string parsing by splitting it into
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meaningful tokens.
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It was directly ported from the Java protocol buffer API.
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"""
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_WHITESPACE = re.compile('(\\s|(#.*$))+', re.MULTILINE)
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_TOKEN = re.compile(
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'[a-zA-Z_][0-9a-zA-Z_+-]*|' # an identifier
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'[0-9+-][0-9a-zA-Z_.+-]*|' # a number
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'\"([^\"\n\\\\]|\\\\.)*(\"|\\\\?$)|' # a double-quoted string
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'\'([^\'\n\\\\]|\\\\.)*(\'|\\\\?$)') # a single-quoted string
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_IDENTIFIER = re.compile(r'\w+')
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def __init__(self, lines):
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self._position = 0
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self._line = -1
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self._column = 0
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self._token_start = None
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self.token = ''
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self._lines = iter(lines)
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self._current_line = ''
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self._previous_line = 0
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self._previous_column = 0
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self._more_lines = True
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self._SkipWhitespace()
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self.NextToken()
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def AtEnd(self):
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"""Checks the end of the text was reached.
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Returns:
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True iff the end was reached.
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"""
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return not self.token
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def _PopLine(self):
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while len(self._current_line) <= self._column:
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try:
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self._current_line = self._lines.next()
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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 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, 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, e:
|
|
raise self._ParseError(str(e))
|
|
self.NextToken()
|
|
return result
|
|
|
|
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, e:
|
|
raise self._ParseError(str(e))
|
|
self.NextToken()
|
|
return result
|
|
|
|
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, e:
|
|
raise self._ParseError(str(e))
|
|
self.NextToken()
|
|
return result
|
|
|
|
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, 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, e:
|
|
raise self._ParseError(str(e))
|
|
self.NextToken()
|
|
return result
|
|
|
|
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 unicode(the_bytes, 'utf-8')
|
|
except UnicodeDecodeError, 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 ('\'', '"'):
|
|
the_list.append(self._ConsumeSingleByteString())
|
|
return ''.encode('latin1').join(the_list) ##PY25
|
|
##!PY25 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.
|
|
"""
|
|
text = self.token
|
|
if len(text) < 1 or text[0] not in ('\'', '"'):
|
|
raise self._ParseError('Expected string.')
|
|
|
|
if len(text) < 2 or text[-1] != text[0]:
|
|
raise self._ParseError('String missing ending quote.')
|
|
|
|
try:
|
|
result = text_encoding.CUnescape(text[1:-1])
|
|
except ValueError, e:
|
|
raise self._ParseError(str(e))
|
|
self.NextToken()
|
|
return result
|
|
|
|
def ConsumeEnum(self, field):
|
|
try:
|
|
result = ParseEnum(field, self.token)
|
|
except ValueError, 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
|