blob: fb75cf7ae27b35e6406307371d87bc27fba840c0 [file] [log] [blame]
#!/usr/bin/env python3
# kate: replace-tabs on; indent-width 4;
from __future__ import unicode_literals
'''Generate header file for nanopb from a ProtoBuf FileDescriptorSet.'''
nanopb_version = "nanopb-0.4.8-dev"
import sys
import re
import codecs
import copy
import itertools
import tempfile
import shutil
import shlex
import os
from functools import reduce
# Python-protobuf breaks easily with protoc version differences if
# using the cpp or upb implementation. Force it to use pure Python
# implementation. Performance is not very important in the generator.
# Make sure grpc_tools gets included in binary package if it is available
import grpc_tools.protoc
import google.protobuf.text_format as text_format
import google.protobuf.descriptor_pb2 as descriptor
import google.protobuf.compiler.plugin_pb2 as plugin_pb2
import google.protobuf.reflection as reflection
import google.protobuf.descriptor
*** Could not import the Google protobuf Python libraries ***
*** ***
*** Easiest solution is often to install the dependencies via pip: ***
*** pip install protobuf grpcio-tools ***
''' + '\n')
# Depending on how this script is run, we may or may not have PEP366 package name
# available for relative imports.
if not __package__:
import proto
from proto._utils import invoke_protoc
from proto import TemporaryDirectory
from . import proto
from .proto._utils import invoke_protoc
from .proto import TemporaryDirectory
if getattr(sys, 'frozen', False):
# Binary package, just import the file
from proto import nanopb_pb2
# Try to rebuild if necessary
nanopb_pb2 = proto.load_nanopb_pb2()
# Add some dummy imports to keep packaging tools happy.
import google # bbfreeze seems to need these
import pkg_resources # pyinstaller / protobuf 2.5 seem to need these
from proto import nanopb_pb2 # pyinstaller seems to need this
import pkg_resources.py2_warn
# Don't care, we will error out later if it is actually important.
# ---------------------------------------------------------------------------
# Generation of single fields
# ---------------------------------------------------------------------------
import time
import os.path
# Values are tuple (c type, pb type, encoded size, data_size)
FieldD = descriptor.FieldDescriptorProto
datatypes = {
FieldD.TYPE_BOOL: ('bool', 'BOOL', 1, 4),
FieldD.TYPE_DOUBLE: ('double', 'DOUBLE', 8, 8),
FieldD.TYPE_FIXED32: ('uint32_t', 'FIXED32', 4, 4),
FieldD.TYPE_FIXED64: ('uint64_t', 'FIXED64', 8, 8),
FieldD.TYPE_FLOAT: ('float', 'FLOAT', 4, 4),
FieldD.TYPE_INT32: ('int32_t', 'INT32', 10, 4),
FieldD.TYPE_INT64: ('int64_t', 'INT64', 10, 8),
FieldD.TYPE_SFIXED32: ('int32_t', 'SFIXED32', 4, 4),
FieldD.TYPE_SFIXED64: ('int64_t', 'SFIXED64', 8, 8),
FieldD.TYPE_SINT32: ('int32_t', 'SINT32', 5, 4),
FieldD.TYPE_SINT64: ('int64_t', 'SINT64', 10, 8),
FieldD.TYPE_UINT32: ('uint32_t', 'UINT32', 5, 4),
FieldD.TYPE_UINT64: ('uint64_t', 'UINT64', 10, 8),
# Integer size override options
(FieldD.TYPE_INT32, nanopb_pb2.IS_8): ('int8_t', 'INT32', 10, 1),
(FieldD.TYPE_INT32, nanopb_pb2.IS_16): ('int16_t', 'INT32', 10, 2),
(FieldD.TYPE_INT32, nanopb_pb2.IS_32): ('int32_t', 'INT32', 10, 4),
(FieldD.TYPE_INT32, nanopb_pb2.IS_64): ('int64_t', 'INT32', 10, 8),
(FieldD.TYPE_SINT32, nanopb_pb2.IS_8): ('int8_t', 'SINT32', 2, 1),
(FieldD.TYPE_SINT32, nanopb_pb2.IS_16): ('int16_t', 'SINT32', 3, 2),
(FieldD.TYPE_SINT32, nanopb_pb2.IS_32): ('int32_t', 'SINT32', 5, 4),
(FieldD.TYPE_SINT32, nanopb_pb2.IS_64): ('int64_t', 'SINT32', 10, 8),
(FieldD.TYPE_UINT32, nanopb_pb2.IS_8): ('uint8_t', 'UINT32', 2, 1),
(FieldD.TYPE_UINT32, nanopb_pb2.IS_16): ('uint16_t','UINT32', 3, 2),
(FieldD.TYPE_UINT32, nanopb_pb2.IS_32): ('uint32_t','UINT32', 5, 4),
(FieldD.TYPE_UINT32, nanopb_pb2.IS_64): ('uint64_t','UINT32', 10, 8),
(FieldD.TYPE_INT64, nanopb_pb2.IS_8): ('int8_t', 'INT64', 10, 1),
(FieldD.TYPE_INT64, nanopb_pb2.IS_16): ('int16_t', 'INT64', 10, 2),
(FieldD.TYPE_INT64, nanopb_pb2.IS_32): ('int32_t', 'INT64', 10, 4),
(FieldD.TYPE_INT64, nanopb_pb2.IS_64): ('int64_t', 'INT64', 10, 8),
(FieldD.TYPE_SINT64, nanopb_pb2.IS_8): ('int8_t', 'SINT64', 2, 1),
(FieldD.TYPE_SINT64, nanopb_pb2.IS_16): ('int16_t', 'SINT64', 3, 2),
(FieldD.TYPE_SINT64, nanopb_pb2.IS_32): ('int32_t', 'SINT64', 5, 4),
(FieldD.TYPE_SINT64, nanopb_pb2.IS_64): ('int64_t', 'SINT64', 10, 8),
(FieldD.TYPE_UINT64, nanopb_pb2.IS_8): ('uint8_t', 'UINT64', 2, 1),
(FieldD.TYPE_UINT64, nanopb_pb2.IS_16): ('uint16_t','UINT64', 3, 2),
(FieldD.TYPE_UINT64, nanopb_pb2.IS_32): ('uint32_t','UINT64', 5, 4),
(FieldD.TYPE_UINT64, nanopb_pb2.IS_64): ('uint64_t','UINT64', 10, 8),
class NamingStyle:
def enum_name(self, name):
return "_%s" % (name)
def struct_name(self, name):
return "_%s" % (name)
def type_name(self, name):
return "%s" % (name)
def define_name(self, name):
return "%s" % (name)
def var_name(self, name):
return "%s" % (name)
def enum_entry(self, name):
return "%s" % (name)
def func_name(self, name):
return "%s" % (name)
def bytes_type(self, struct_name, name):
return "%s_%s_t" % (struct_name, name)
class NamingStyleC(NamingStyle):
def enum_name(self, name):
return self.underscore(name)
def struct_name(self, name):
return self.underscore(name)
def type_name(self, name):
return "%s_t" % self.underscore(name)
def define_name(self, name):
return self.underscore(name).upper()
def var_name(self, name):
return self.underscore(name)
def enum_entry(self, name):
return self.underscore(name).upper()
def func_name(self, name):
return self.underscore(name)
def bytes_type(self, struct_name, name):
return "%s_%s_t" % (self.underscore(struct_name), self.underscore(name))
def underscore(self, word):
word = str(word)
word = re.sub(r"([A-Z]+)([A-Z][a-z])", r'\1_\2', word)
word = re.sub(r"([a-z\d])([A-Z])", r'\1_\2', word)
word = word.replace("-", "_")
return word.lower()
class Globals:
'''Ugly global variables, should find a good way to pass these.'''
verbose_options = False
separate_options = []
matched_namemasks = set()
protoc_insertion_points = False
naming_style = NamingStyle()
# String types and file encoding for Python2 UTF-8 support
if sys.version_info.major == 2:
import codecs
open =
strtypes = (unicode, str)
def str(x):
return strtypes[1](x)
except UnicodeEncodeError:
return strtypes[0](x)
strtypes = (str, )
class Names:
'''Keeps a set of nested names and formats them to C identifier.'''
def __init__(self, parts = ()):
if isinstance(parts, Names):
parts =
elif isinstance(parts, strtypes):
parts = (parts,) = tuple(parts)
if == ('',): = ()
def __str__(self):
return '_'.join(
def __repr__(self):
return 'Names(%s)' % ','.join("'%s'" % x for x in
def __add__(self, other):
if isinstance(other, strtypes):
return Names( + (other,))
elif isinstance(other, Names):
return Names( +
elif isinstance(other, tuple):
return Names( + other)
raise ValueError("Name parts should be of type str")
def __eq__(self, other):
return isinstance(other, Names) and ==
def __lt__(self, other):
if not isinstance(other, Names):
return NotImplemented
return str(self) < str(other)
def names_from_type_name(type_name):
'''Parse Names() from FieldDescriptorProto type_name'''
if type_name[0] != '.':
raise NotImplementedError("Lookup of non-absolute type names is not supported")
return Names(type_name[1:].split('.'))
def varint_max_size(max_value):
'''Returns the maximum number of bytes a varint can take when encoded.'''
if max_value < 0:
max_value = 2**64 - max_value
for i in range(1, 11):
if (max_value >> (i * 7)) == 0:
return i
raise ValueError("Value too large for varint: " + str(max_value))
assert varint_max_size(-1) == 10
assert varint_max_size(0) == 1
assert varint_max_size(127) == 1
assert varint_max_size(128) == 2
class EncodedSize:
'''Class used to represent the encoded size of a field or a message.
Consists of a combination of symbolic sizes and integer sizes.'''
def __init__(self, value = 0, symbols = [], declarations = [], required_defines = []):
if isinstance(value, EncodedSize):
self.value = value.value
self.symbols = value.symbols
self.declarations = value.declarations
self.required_defines = value.required_defines
elif isinstance(value, strtypes + (Names,)):
self.symbols = [str(value)]
self.value = 0
self.declarations = []
self.required_defines = [str(value)]
self.value = value
self.symbols = symbols
self.declarations = declarations
self.required_defines = required_defines
def __add__(self, other):
if isinstance(other, int):
return EncodedSize(self.value + other, self.symbols, self.declarations, self.required_defines)
elif isinstance(other, strtypes + (Names,)):
return EncodedSize(self.value, self.symbols + [str(other)], self.declarations, self.required_defines + [str(other)])
elif isinstance(other, EncodedSize):
return EncodedSize(self.value + other.value, self.symbols + other.symbols,
self.declarations + other.declarations, self.required_defines + other.required_defines)
raise ValueError("Cannot add size: " + repr(other))
def __mul__(self, other):
if isinstance(other, int):
return EncodedSize(self.value * other, [str(other) + '*' + s for s in self.symbols],
self.declarations, self.required_defines)
raise ValueError("Cannot multiply size: " + repr(other))
def __str__(self):
if not self.symbols:
return str(self.value)
return '(' + str(self.value) + ' + ' + ' + '.join(self.symbols) + ')'
def __repr__(self):
return 'EncodedSize(%s, %s, %s, %s)' % (self.value, self.symbols, self.declarations, self.required_defines)
def get_declarations(self):
'''Get any declarations that must appear alongside this encoded size definition,
such as helper union {} types.'''
return '\n'.join(self.declarations)
def get_cpp_guard(self, local_defines):
'''Get an #if preprocessor statement listing all defines that are required for this definition.'''
needed = [x for x in self.required_defines if x not in local_defines]
if needed:
return '#if ' + ' && '.join(['defined(%s)' % x for x in needed]) + "\n"
return ''
def upperlimit(self):
if not self.symbols:
return self.value
return 2**32 - 1
class ProtoElement(object):
# Constants regarding path of proto elements in file descriptor.
# They are used to connect proto elements with source code information (comments)
# These values come from:
ENUM = 5
def __init__(self, path, comments = None):
path is a tuple containing integers (type, index, ...)
comments is a dictionary mapping between element path & SourceCodeInfo.Location
(contains information about source comments).
assert(isinstance(path, tuple))
self.element_path = path
self.comments = comments or {}
def get_member_comments(self, index):
'''Get comments for a member of enum or message.'''
return self.get_comments((ProtoElement.FIELD, index), leading_indent = True)
def format_comment(self, comment):
'''Put comment inside /* */ and sanitize comment contents'''
comment = comment.strip()
comment = comment.replace('/*', '/ *')
comment = comment.replace('*/', '* /')
return "/* %s */" % comment
def get_comments(self, member_path = (), leading_indent = False):
'''Get leading & trailing comments for a protobuf element.
member_path is the proto path of an element or member (ex. [5 0] or [4 1 2 0])
leading_indent is a flag that indicates if leading comments should be indented
# Obtain SourceCodeInfo.Location object containing comment
# information (based on the member path)
path = self.element_path + member_path
comment = self.comments.get(path)
leading_comment = ""
trailing_comment = ""
if not comment:
return leading_comment, trailing_comment
if comment.leading_comments:
leading_comment = " " if leading_indent else ""
leading_comment += self.format_comment(comment.leading_comments)
if comment.trailing_comments:
trailing_comment = self.format_comment(comment.trailing_comments)
return leading_comment, trailing_comment
class Enum(ProtoElement):
def __init__(self, names, desc, enum_options, element_path, comments):
desc is EnumDescriptorProto
index is the index of this enum element inside the file
comments is a dictionary mapping between element path & SourceCodeInfo.Location
(contains information about source comments)
super(Enum, self).__init__(element_path, comments)
self.options = enum_options
self.names = names
# by definition, `names` include this enum's name
base_name = Names([:-1])
if enum_options.long_names:
self.values = [(names +, x.number) for x in desc.value]
self.values = [(base_name +, x.number) for x in desc.value]
self.value_longnames = [self.names + for x in desc.value]
self.packed = enum_options.packed_enum
def has_negative(self):
for n, v in self.values:
if v < 0:
return True
return False
def encoded_size(self):
return max([varint_max_size(v) for n,v in self.values])
def __repr__(self):
return 'Enum(%s)' % self.names
def __str__(self):
leading_comment, trailing_comment = self.get_comments()
result = ''
if leading_comment:
result = '%s\n' % leading_comment
result += 'typedef enum %s {' % Globals.naming_style.enum_name(self.names)
if trailing_comment:
result += " " + trailing_comment
result += "\n"
enum_length = len(self.values)
enum_values = []
for index, (name, value) in enumerate(self.values):
leading_comment, trailing_comment = self.get_member_comments(index)
if leading_comment:
comma = ","
if index == enum_length - 1:
# last enum member should not end with a comma
comma = ""
enum_value = " %s = %d%s" % (Globals.naming_style.enum_entry(name), value, comma)
if trailing_comment:
enum_value += " " + trailing_comment
result += '\n'.join(enum_values)
result += '\n}'
if self.packed:
result += ' pb_packed'
result += ' %s;' % Globals.naming_style.type_name(self.names)
return result
def auxiliary_defines(self):
# sort the enum by value
sorted_values = sorted(self.values, key = lambda x: (x[1], x[0]))
result = '#define %s %s\n' % (
Globals.naming_style.define_name('_%s_MIN' % self.names),
result += '#define %s %s\n' % (
Globals.naming_style.define_name('_%s_MAX' % self.names),
result += '#define %s ((%s)(%s+1))\n' % (
Globals.naming_style.define_name('_%s_ARRAYSIZE' % self.names),
if not self.options.long_names:
# Define the long names always so that enum value references
# from other files work properly.
for i, x in enumerate(self.values):
result += '#define %s %s\n' % (self.value_longnames[i], x[0])
if self.options.enum_to_string:
result += 'const char *%s(%s v);\n' % (
Globals.naming_style.func_name('%s_name' % self.names),
return result
def enum_to_string_definition(self):
if not self.options.enum_to_string:
return ""
result = 'const char *%s(%s v) {\n' % (
Globals.naming_style.func_name('%s_name' % self.names),
result += ' switch (v) {\n'
for ((enumname, _), strname) in zip(self.values, self.value_longnames):
# Strip off the leading type name from the string value.
strval = str(strname)[len(str(self.names)) + 1:]
result += ' case %s: return "%s";\n' % (
result += ' }\n'
result += ' return "unknown";\n'
result += '}\n'
return result
class FieldMaxSize:
def __init__(self, worst = 0, checks = [], field_name = 'undefined'):
if isinstance(worst, list):
self.worst = max(i for i in worst if i is not None)
self.worst = worst
self.worst_field = field_name
self.checks = list(checks)
def extend(self, extend, field_name = None):
self.worst = max(self.worst, extend.worst)
if self.worst == extend.worst:
self.worst_field = extend.worst_field
class Field(ProtoElement):
macro_x_param = 'X'
macro_a_param = 'a'
def __init__(self, struct_name, desc, field_options, element_path = (), comments = None):
'''desc is FieldDescriptorProto'''
ProtoElement.__init__(self, element_path, comments)
self.tag = desc.number
self.struct_name = struct_name
self.union_name = None =
self.default = None
self.max_size = None
self.max_count = None
self.array_decl = ""
self.enc_size = None
self.data_item_size = None
self.ctype = None
self.fixed_count = False
self.callback_datatype = field_options.callback_datatype
self.math_include_required = False
self.sort_by_tag = field_options.sort_by_tag
if field_options.type == nanopb_pb2.FT_INLINE:
# Before nanopb-0.3.8, fixed length bytes arrays were specified
# by setting type to FT_INLINE. But to handle pointer typed fields,
# it makes sense to have it as a separate option.
field_options.type = nanopb_pb2.FT_STATIC
field_options.fixed_length = True
# Parse field options
if field_options.HasField("max_size"):
self.max_size = field_options.max_size
self.default_has = field_options.default_has
if desc.type == FieldD.TYPE_STRING and field_options.HasField("max_length"):
# max_length overrides max_size for strings
self.max_size = field_options.max_length + 1
if field_options.HasField("max_count"):
self.max_count = field_options.max_count
if desc.HasField('default_value'):
self.default = desc.default_value
# Check field rules, i.e. required/optional/repeated.
can_be_static = True
if desc.label == FieldD.LABEL_REPEATED:
self.rules = 'REPEATED'
if self.max_count is None:
can_be_static = False
self.array_decl = '[%d]' % self.max_count
if field_options.fixed_count:
self.rules = 'FIXARRAY'
elif field_options.proto3:
if desc.type == FieldD.TYPE_MESSAGE and not field_options.proto3_singular_msgs:
# In most other protobuf libraries proto3 submessages have
# "null" status. For nanopb, that is implemented as has_ field.
self.rules = 'OPTIONAL'
elif hasattr(desc, "proto3_optional") and desc.proto3_optional:
# Protobuf 3.12 introduced optional fields for proto3 syntax
self.rules = 'OPTIONAL'
# Proto3 singular fields (without has_field)
self.rules = 'SINGULAR'
elif desc.label == FieldD.LABEL_REQUIRED:
self.rules = 'REQUIRED'
elif desc.label == FieldD.LABEL_OPTIONAL:
self.rules = 'OPTIONAL'
raise NotImplementedError(desc.label)
# Check if the field can be implemented with static allocation
# i.e. whether the data size is known.
if desc.type == FieldD.TYPE_STRING and self.max_size is None:
can_be_static = False
if desc.type == FieldD.TYPE_BYTES and self.max_size is None:
can_be_static = False
# Decide how the field data will be allocated
if field_options.type == nanopb_pb2.FT_DEFAULT:
if can_be_static:
field_options.type = nanopb_pb2.FT_STATIC
field_options.type = field_options.fallback_type
if field_options.type == nanopb_pb2.FT_STATIC and not can_be_static:
raise Exception("Field '%s' is defined as static, but max_size or "
"max_count is not given." %
if field_options.fixed_count and self.max_count is None:
raise Exception("Field '%s' is defined as fixed count, "
"but max_count is not given." %
if field_options.type == nanopb_pb2.FT_STATIC:
self.allocation = 'STATIC'
elif field_options.type == nanopb_pb2.FT_POINTER:
self.allocation = 'POINTER'
elif field_options.type == nanopb_pb2.FT_CALLBACK:
self.allocation = 'CALLBACK'
raise NotImplementedError(field_options.type)
if field_options.HasField("type_override"):
desc.type = field_options.type_override
# Decide the C data type to use in the struct.
if desc.type in datatypes:
self.ctype, self.pbtype, self.enc_size, self.data_item_size = datatypes[desc.type]
# Override the field size if user wants to use smaller integers
if (desc.type, field_options.int_size) in datatypes:
self.ctype, self.pbtype, self.enc_size, self.data_item_size = datatypes[(desc.type, field_options.int_size)]
elif desc.type == FieldD.TYPE_ENUM:
self.pbtype = 'ENUM'
self.data_item_size = 4
self.ctype = names_from_type_name(desc.type_name)
if self.default is not None:
self.default = self.ctype + self.default
self.enc_size = None # Needs to be filled in when enum values are known
elif desc.type == FieldD.TYPE_STRING:
self.pbtype = 'STRING'
self.ctype = 'char'
if self.allocation == 'STATIC':
self.ctype = 'char'
self.array_decl += '[%d]' % self.max_size
# -1 because of null terminator. Both pb_encode and pb_decode
# check the presence of it.
self.enc_size = varint_max_size(self.max_size) + self.max_size - 1
elif desc.type == FieldD.TYPE_BYTES:
if field_options.fixed_length:
self.pbtype = 'FIXED_LENGTH_BYTES'
if self.max_size is None:
raise Exception("Field '%s' is defined as fixed length, "
"but max_size is not given." %
self.enc_size = varint_max_size(self.max_size) + self.max_size
self.ctype = 'pb_byte_t'
self.array_decl += '[%d]' % self.max_size
self.pbtype = 'BYTES'
self.ctype = 'pb_bytes_array_t'
if self.allocation == 'STATIC':
self.ctype = Globals.naming_style.bytes_type(self.struct_name,
self.enc_size = varint_max_size(self.max_size) + self.max_size
elif desc.type == FieldD.TYPE_MESSAGE:
self.pbtype = 'MESSAGE'
self.ctype = self.submsgname = names_from_type_name(desc.type_name)
self.enc_size = None # Needs to be filled in after the message type is available
if field_options.submsg_callback and self.allocation == 'STATIC':
self.pbtype = 'MSG_W_CB'
raise NotImplementedError(desc.type)
if self.default and self.pbtype in ['FLOAT', 'DOUBLE']:
if 'inf' in self.default or 'nan' in self.default:
self.math_include_required = True
def __lt__(self, other):
return self.tag < other.tag
def __repr__(self):
return 'Field(%s)' %
def __str__(self):
result = ''
var_name = Globals.naming_style.var_name(
type_name = Globals.naming_style.type_name(self.ctype) if isinstance(self.ctype, Names) else self.ctype
if self.allocation == 'POINTER':
if self.rules == 'REPEATED':
if self.pbtype == 'MSG_W_CB':
result += ' pb_callback_t cb_' + var_name + ';\n'
result += ' pb_size_t ' + var_name + '_count;\n'
if self.rules == 'FIXARRAY' and self.pbtype in ['STRING', 'BYTES']:
# Pointer to fixed size array of pointers
result += ' %s* (*%s)%s;' % (type_name, var_name, self.array_decl)
elif self.pbtype == 'FIXED_LENGTH_BYTES' or self.rules == 'FIXARRAY':
# Pointer to fixed size array of items
result += ' %s (*%s)%s;' % (type_name, var_name, self.array_decl)
elif self.rules == 'REPEATED' and self.pbtype in ['STRING', 'BYTES']:
# String/bytes arrays need to be defined as pointers to pointers
result += ' %s **%s;' % (type_name, var_name)
elif self.pbtype in ['MESSAGE', 'MSG_W_CB']:
# Use struct definition, so recursive submessages are possible
result += ' struct %s *%s;' % (Globals.naming_style.struct_name(self.ctype), var_name)
# Normal case, just a pointer to single item
result += ' %s *%s;' % (type_name, var_name)
elif self.allocation == 'CALLBACK':
result += ' %s %s;' % (self.callback_datatype, var_name)
if self.pbtype == 'MSG_W_CB' and self.rules in ['OPTIONAL', 'REPEATED']:
result += ' pb_callback_t cb_' + var_name + ';\n'
if self.rules == 'OPTIONAL':
result += ' bool has_' + var_name + ';\n'
elif self.rules == 'REPEATED':
result += ' pb_size_t ' + var_name + '_count;\n'
result += ' %s %s%s;' % (type_name, var_name, self.array_decl)
leading_comment, trailing_comment = self.get_comments(leading_indent = True)
if leading_comment: result = leading_comment + "\n" + result
if trailing_comment: result = result + " " + trailing_comment
return result
def types(self):
'''Return definitions for any special types this field might need.'''
if self.pbtype == 'BYTES' and self.allocation == 'STATIC':
result = 'typedef PB_BYTES_ARRAY_T(%d) %s;\n' % (self.max_size, Globals.naming_style.var_name(self.ctype))
result = ''
return result
def get_dependencies(self):
'''Get list of type names used by this field.'''
if self.allocation == 'STATIC':
return [str(self.ctype)]
elif self.allocation == 'POINTER' and self.rules == 'FIXARRAY':
return [str(self.ctype)]
return []
def get_initializer(self, null_init, inner_init_only = False):
'''Return literal expression for this field's default value.
null_init: If True, initialize to a 0 value instead of default from .proto
inner_init_only: If True, exclude initialization for any count/has fields
inner_init = None
if self.pbtype in ['MESSAGE', 'MSG_W_CB']:
if null_init:
inner_init = Globals.naming_style.define_name('%s_init_zero' % self.ctype)
inner_init = Globals.naming_style.define_name('%s_init_default' % self.ctype)
elif self.default is None or null_init:
if self.pbtype == 'STRING':
inner_init = '""'
elif self.pbtype == 'BYTES':
inner_init = '{0, {0}}'
elif self.pbtype == 'FIXED_LENGTH_BYTES':
inner_init = '{0}'
elif self.pbtype in ('ENUM', 'UENUM'):
inner_init = '_%s_MIN' % Globals.naming_style.define_name(self.ctype)
inner_init = '0'
if self.pbtype == 'STRING':
data = codecs.escape_encode(self.default.encode('utf-8'))[0]
inner_init = '"' + data.decode('ascii') + '"'
elif self.pbtype == 'BYTES':
data = codecs.escape_decode(self.default)[0]
data = ["0x%02x" % c for c in bytearray(data)]
if len(data) == 0:
inner_init = '{0, {0}}'
inner_init = '{%d, {%s}}' % (len(data), ','.join(data))
elif self.pbtype == 'FIXED_LENGTH_BYTES':
data = codecs.escape_decode(self.default)[0]
data = ["0x%02x" % c for c in bytearray(data)]
if len(data) == 0:
inner_init = '{0}'
inner_init = '{%s}' % ','.join(data)
elif self.pbtype in ['FIXED32', 'UINT32']:
inner_init = str(self.default) + 'u'
elif self.pbtype in ['FIXED64', 'UINT64']:
inner_init = str(self.default) + 'ull'
elif self.pbtype in ['SFIXED64', 'INT64']:
inner_init = str(self.default) + 'll'
elif self.pbtype in ['FLOAT', 'DOUBLE']:
inner_init = str(self.default)
if 'inf' in inner_init:
inner_init = inner_init.replace('inf', 'INFINITY')
elif 'nan' in inner_init:
inner_init = inner_init.replace('nan', 'NAN')
elif (not '.' in inner_init) and self.pbtype == 'FLOAT':
inner_init += '.0f'
elif self.pbtype == 'FLOAT':
inner_init += 'f'
inner_init = str(self.default)
if inner_init_only:
return inner_init
outer_init = None
if self.allocation == 'STATIC':
if self.rules == 'REPEATED':
outer_init = '0, {' + ', '.join([inner_init] * self.max_count) + '}'
elif self.rules == 'FIXARRAY':
outer_init = '{' + ', '.join([inner_init] * self.max_count) + '}'
elif self.rules == 'OPTIONAL':
if null_init or not self.default_has:
outer_init = 'false, ' + inner_init
outer_init = 'true, ' + inner_init
outer_init = inner_init
elif self.allocation == 'POINTER':
if self.rules == 'REPEATED':
outer_init = '0, NULL'
outer_init = 'NULL'
elif self.allocation == 'CALLBACK':
if self.pbtype == 'EXTENSION':
outer_init = 'NULL'
outer_init = '{{NULL}, NULL}'
if self.pbtype == 'MSG_W_CB' and self.rules in ['REPEATED', 'OPTIONAL']:
outer_init = '{{NULL}, NULL}, ' + outer_init
return outer_init
def tags(self):
'''Return the #define for the tag number of this field.'''
identifier = Globals.naming_style.define_name('%s_%s_tag' % (self.struct_name,
return '#define %-40s %d\n' % (identifier, self.tag)
def fieldlist(self):
'''Return the FIELDLIST macro entry for this field.
Format is: X(a, ATYPE, HTYPE, LTYPE, field_name, tag)
name = Globals.naming_style.var_name(
if self.rules == "ONEOF":
# For oneofs, make a tuple of the union name, union member name,
# and the name inside the parent struct.
if not self.anonymous:
name = '(%s,%s,%s)' % (
Globals.naming_style.var_name(self.union_name) + '.' +
name = '(%s,%s,%s)' % (
return '%s(%s, %-9s %-9s %-9s %-16s %3d)' % (self.macro_x_param,
self.allocation + ',',
self.rules + ',',
self.pbtype + ',',
name + ',',
def data_size(self, dependencies):
'''Return estimated size of this field in the C struct.
This is used to try to automatically pick right descriptor size.
If the estimate is wrong, it will result in compile time error and
user having to specify descriptor_width option.
if self.allocation == 'POINTER' or self.pbtype == 'EXTENSION':
size = 8
alignment = 8
elif self.allocation == 'CALLBACK':
size = 16
alignment = 8
elif self.pbtype in ['MESSAGE', 'MSG_W_CB']:
alignment = 8
if str(self.submsgname) in dependencies:
other_dependencies = dict(x for x in dependencies.items() if x[0] != str(self.struct_name))
size = dependencies[str(self.submsgname)].data_size(other_dependencies)
size = 256 # Message is in other file, this is reasonable guess for most cases
sys.stderr.write('Could not determine size for submessage %s, using default %d\n' % (self.submsgname, size))
if self.pbtype == 'MSG_W_CB':
size += 16
elif self.pbtype in ['STRING', 'FIXED_LENGTH_BYTES']:
size = self.max_size
alignment = 4
elif self.pbtype == 'BYTES':
size = self.max_size + 4
alignment = 4
elif self.data_item_size is not None:
size = self.data_item_size
alignment = 4
if self.data_item_size >= 8:
alignment = 8
raise Exception("Unhandled field type: %s" % self.pbtype)
if self.rules in ['REPEATED', 'FIXARRAY'] and self.allocation == 'STATIC':
size *= self.max_count
if self.rules not in ('REQUIRED', 'SINGULAR'):
size += 4
if size % alignment != 0:
# Estimate how much alignment requirements will increase the size.
size += alignment - (size % alignment)
return size
def encoded_size(self, dependencies):
'''Return the maximum size that this field can take when encoded,
including the field tag. If the size cannot be determined, returns
if self.allocation != 'STATIC':
return None
if self.pbtype in ['MESSAGE', 'MSG_W_CB']:
encsize = None
if str(self.submsgname) in dependencies:
submsg = dependencies[str(self.submsgname)]
other_dependencies = dict(x for x in dependencies.items() if x[0] != str(self.struct_name))
encsize = submsg.encoded_size(other_dependencies)
my_msg = dependencies.get(str(self.struct_name))
external = (not my_msg or submsg.protofile != my_msg.protofile)
if encsize and encsize.symbols and external:
# Couldn't fully resolve the size of a dependency from
# another file. Instead of including the symbols directly,
# just use the #define SubMessage_size from the header.
encsize = None
if encsize is not None:
# Include submessage length prefix
encsize += varint_max_size(encsize.upperlimit())
elif not external:
# The dependency is from the same file and size cannot be
# determined for it, thus we know it will not be possible
# in runtime either.
return None
if encsize is None:
# Submessage or its size cannot be found.
# This can occur if submessage is defined in different
# file, and it or its .options could not be found.
# Instead of direct numeric value, reference the size that
# has been #defined in the other file.
encsize = EncodedSize(self.submsgname + 'size')
# We will have to make a conservative assumption on the length
# prefix size, though.
encsize += 5
elif self.pbtype in ['ENUM', 'UENUM']:
if str(self.ctype) in dependencies:
enumtype = dependencies[str(self.ctype)]
encsize = enumtype.encoded_size()
# Conservative assumption
encsize = 10
elif self.enc_size is None:
raise RuntimeError("Could not determine encoded size for %s.%s"
% (self.struct_name,
encsize = EncodedSize(self.enc_size)
encsize += varint_max_size(self.tag << 3) # Tag + wire type
if self.rules in ['REPEATED', 'FIXARRAY']:
# Decoders must be always able to handle unpacked arrays.
# Therefore we have to reserve space for it, even though
# we emit packed arrays ourselves. For length of 1, packed
# arrays are larger however so we need to add allowance
# for the length byte.
encsize *= self.max_count
if self.max_count == 1:
encsize += 1
return encsize
def has_callbacks(self):
return self.allocation == 'CALLBACK'
def requires_custom_field_callback(self):
return self.allocation == 'CALLBACK' and self.callback_datatype != 'pb_callback_t'
class ExtensionRange(Field):
def __init__(self, struct_name, range_start, field_options):
'''Implements a special pb_extension_t* field in an extensible message
structure. The range_start signifies the index at which the extensions
start. Not necessarily all tags above this are extensions, it is merely
a speed optimization.
self.tag = range_start
self.struct_name = struct_name = 'extensions'
self.pbtype = 'EXTENSION'
self.rules = 'OPTIONAL'
self.allocation = 'CALLBACK'
self.ctype = 'pb_extension_t'
self.array_decl = ''
self.default = None
self.max_size = 0
self.max_count = 0
self.data_item_size = 0
self.fixed_count = False
self.callback_datatype = 'pb_extension_t*'
def requires_custom_field_callback(self):
return False
def __str__(self):
return ' pb_extension_t *extensions;'
def types(self):
return ''
def tags(self):
return ''
def encoded_size(self, dependencies):
# We exclude extensions from the count, because they cannot be known
# until runtime. Other option would be to return None here, but this
# way the value remains useful if extensions are not used.
return EncodedSize(0)
class ExtensionField(Field):
def __init__(self, fullname, desc, field_options):
self.fullname = fullname
self.extendee_name = names_from_type_name(desc.extendee)
Field.__init__(self, self.fullname + "extmsg", desc, field_options)
if self.rules != 'OPTIONAL':
self.skip = True
self.skip = False
self.rules = 'REQUIRED' # We don't really want the has_field for extensions
# currently no support for comments for extension fields => provide (), {}
self.msg = Message(self.fullname + "extmsg", None, field_options, (), {})
def tags(self):
'''Return the #define for the tag number of this field.'''
identifier = Globals.naming_style.define_name('%s_tag' % (self.fullname))
return '#define %-40s %d\n' % (identifier, self.tag)
def extension_decl(self):
'''Declaration of the extension type in the .pb.h file'''
if self.skip:
msg = '/* Extension field %s was skipped because only "optional"\n' % self.fullname
msg +=' type of extension fields is currently supported. */\n'
return msg
return ('extern const pb_extension_type_t %s; /* field type: %s */\n' %
(Globals.naming_style.var_name(self.fullname), str(self).strip()))
def extension_def(self, dependencies):
'''Definition of the extension type in the .pb.c file'''
if self.skip:
return ''
result = "/* Definition for extension field %s */\n" % self.fullname
result += str(self.msg)
result += self.msg.fields_declaration(dependencies)
result += 'pb_byte_t %s_default[] = {0x00};\n' %
result += self.msg.fields_definition(dependencies)
result += 'const pb_extension_type_t %s = {\n' % Globals.naming_style.var_name(self.fullname)
result += ' NULL,\n'
result += ' NULL,\n'
result += ' &%s_msg\n' % Globals.naming_style.type_name(
result += '};\n'
return result
# ---------------------------------------------------------------------------
# Generation of oneofs (unions)
# ---------------------------------------------------------------------------
class OneOf(Field):
def __init__(self, struct_name, oneof_desc, oneof_options):
self.struct_name = struct_name =
self.ctype = 'union'
self.pbtype = 'oneof'
self.fields = []
self.allocation = 'ONEOF'
self.default = None
self.rules = 'ONEOF'
self.anonymous = oneof_options.anonymous_oneof
self.sort_by_tag = oneof_options.sort_by_tag
self.has_msg_cb = False
def add_field(self, field):
field.union_name =
field.rules = 'ONEOF'
field.anonymous = self.anonymous
if self.sort_by_tag:
if field.pbtype == 'MSG_W_CB':
self.has_msg_cb = True
# Sort by the lowest tag number inside union
self.tag = min([f.tag for f in self.fields])
def __str__(self):
result = ''
if self.fields:
if self.has_msg_cb:
result += ' pb_callback_t cb_' + Globals.naming_style.var_name( + ';\n'
result += ' pb_size_t which_' + Globals.naming_style.var_name( + ";\n"
result += ' union {\n'
for f in self.fields:
result += ' ' + str(f).replace('\n', '\n ') + '\n'
if self.anonymous:
result += ' };'
result += ' } ' + Globals.naming_style.var_name( + ';'
return result
def types(self):
return ''.join([f.types() for f in self.fields])
def get_dependencies(self):
deps = []
for f in self.fields:
deps += f.get_dependencies()
return deps
def get_initializer(self, null_init):
if self.has_msg_cb:
return '{{NULL}, NULL}, 0, {' + self.fields[0].get_initializer(null_init) + '}'
return '0, {' + self.fields[0].get_initializer(null_init) + '}'
def tags(self):
return ''.join([f.tags() for f in self.fields])
def data_size(self, dependencies):
return max(f.data_size(dependencies) for f in self.fields)
def encoded_size(self, dependencies):
'''Returns the size of the largest oneof field.'''
largest = 0
dynamic_sizes = {}
for f in self.fields:
size = EncodedSize(f.encoded_size(dependencies))
if size is None or size.value is None:
return None
elif size.symbols:
dynamic_sizes[f.tag] = size
elif size.value > largest:
largest = size.value
if not dynamic_sizes:
# Simple case, all sizes were known at generator time
return EncodedSize(largest)
if largest > 0:
# Some sizes were known, some were not
dynamic_sizes[0] = EncodedSize(largest)
# Couldn't find size for submessage at generation time,
# have to rely on macro resolution at compile time.
if len(dynamic_sizes) == 1:
# Only one symbol was needed
return list(dynamic_sizes.values())[0]
# Use sizeof(union{}) construct to find the maximum size of
# submessages.
union_name = "%s_%s_size_union" % (self.struct_name,
union_def = 'union %s {%s};\n' % (union_name, ' '.join('char f%d[%s];' % (k, s) for k,s in dynamic_sizes.items()))
required_defs = list(itertools.chain.from_iterable(s.required_defines for k,s in dynamic_sizes.items()))
return EncodedSize(0, ['sizeof(union %s)' % union_name], [union_def], required_defs)
def has_callbacks(self):
return bool([f for f in self.fields if f.has_callbacks()])
def requires_custom_field_callback(self):
return bool([f for f in self.fields if f.requires_custom_field_callback()])
# ---------------------------------------------------------------------------
# Generation of messages (structures)
# ---------------------------------------------------------------------------
class Message(ProtoElement):
def __init__(self, names, desc, message_options, element_path, comments):
super(Message, self).__init__(element_path, comments) = names
self.fields = []
self.oneofs = {}
self.desc = desc
self.math_include_required = False
self.packed = message_options.packed_struct
self.descriptorsize = message_options.descriptorsize
if message_options.msgid:
self.msgid = message_options.msgid
if desc is not None:
self.load_fields(desc, message_options)
self.callback_function = message_options.callback_function
if not message_options.HasField('callback_function'):
# Automatically assign a per-message callback if any field has
# a special callback_datatype.
for field in self.fields:
if field.requires_custom_field_callback():
self.callback_function = "%s_callback" %
def load_fields(self, desc, message_options):
'''Load field list from DescriptorProto'''
no_unions = []
if hasattr(desc, 'oneof_decl'):
for i, f in enumerate(desc.oneof_decl):
oneof_options = get_nanopb_suboptions(desc, message_options, +
if oneof_options.no_unions:
no_unions.append(i) # No union, but add fields normally
elif oneof_options.type == nanopb_pb2.FT_IGNORE:
pass # No union and skip fields also
oneof = OneOf(, f, oneof_options)
self.oneofs[i] = oneof
sys.stderr.write('Note: This Python protobuf library has no OneOf support\n')
for index, f in enumerate(desc.field):
field_options = get_nanopb_suboptions(f, message_options, +
if field_options.type == nanopb_pb2.FT_IGNORE:
if field_options.descriptorsize > self.descriptorsize:
self.descriptorsize = field_options.descriptorsize
field = Field(, f, field_options, self.element_path + (ProtoElement.FIELD, index), self.comments)
if hasattr(f, 'oneof_index') and f.HasField('oneof_index'):
if hasattr(f, 'proto3_optional') and f.proto3_optional:
if f.oneof_index in no_unions:
elif f.oneof_index in self.oneofs:
if self.oneofs[f.oneof_index] not in self.fields:
if field.math_include_required:
self.math_include_required = True
if len(desc.extension_range) > 0:
field_options = get_nanopb_suboptions(desc, message_options, + 'extensions')
range_start = min([r.start for r in desc.extension_range])
if field_options.type != nanopb_pb2.FT_IGNORE:
self.fields.append(ExtensionRange(, range_start, field_options))
if message_options.sort_by_tag:
def get_dependencies(self):
'''Get list of type names that this structure refers to.'''
deps = []
for f in self.fields:
deps += f.get_dependencies()
return deps
def __repr__(self):
return 'Message(%s)' %
def __str__(self):
leading_comment, trailing_comment = self.get_comments()
result = ''
if leading_comment:
result = '%s\n' % leading_comment
result += 'typedef struct %s {' % Globals.naming_style.struct_name(
if trailing_comment:
result += " " + trailing_comment
result += '\n'
if not self.fields:
# Empty structs are not allowed in C standard.
# Therefore add a dummy field if an empty message occurs.
result += ' char dummy_field;'
result += '\n'.join([str(f) for f in self.fields])
if Globals.protoc_insertion_points:
result += '\n/* @@protoc_insertion_point(struct:%s) */' %
result += '\n}'
if self.packed:
result += ' pb_packed'
result += ' %s;' % Globals.naming_style.type_name(
if self.packed:
result = 'PB_PACKED_STRUCT_START\n' + result
result += '\nPB_PACKED_STRUCT_END'
return result + '\n'
def types(self):
return ''.join([f.types() for f in self.fields])
def get_initializer(self, null_init):
if not self.fields:
return '{0}'
parts = []
for field in self.fields:
return '{' + ', '.join(parts) + '}'
def count_required_fields(self):
'''Returns number of required fields inside this message'''
count = 0
for f in self.fields:
if not isinstance(f, OneOf):
if f.rules == 'REQUIRED':
count += 1
return count
def all_fields(self):
'''Iterate over all fields in this message, including nested OneOfs.'''
for f in self.fields:
if isinstance(f, OneOf):
for f2 in f.fields:
yield f2
yield f
def field_for_tag(self, tag):
'''Given a tag number, return the Field instance.'''
for field in self.all_fields():
if field.tag == tag:
return field
return None
def count_all_fields(self):
'''Count the total number of fields in this message.'''
count = 0
for f in self.fields:
if isinstance(f, OneOf):
count += len(f.fields)
count += 1
return count
def fields_declaration(self, dependencies):
'''Return X-macro declaration of all fields in this message.'''
Field.macro_x_param = 'X'
Field.macro_a_param = 'a'
while any( == Field.macro_x_param for field in self.all_fields()):
Field.macro_x_param += '_'
while any( == Field.macro_a_param for field in self.all_fields()):
Field.macro_a_param += '_'
# Field descriptor array must be sorted by tag number, pb_common.c relies on it.
sorted_fields = list(self.all_fields())
sorted_fields.sort(key = lambda x: x.tag)
result = '#define %s_FIELDLIST(%s, %s) \\\n' % (
result += ' \\\n'.join(x.fieldlist() for x in sorted_fields)
result += '\n'
has_callbacks = bool([f for f in self.fields if f.has_callbacks()])
if has_callbacks:
if self.callback_function != 'pb_default_field_callback':
result += "extern bool %s(pb_istream_t *istream, pb_ostream_t *ostream, const pb_field_t *field);\n" % self.callback_function
result += "#define %s_CALLBACK %s\n" % (
result += "#define %s_CALLBACK NULL\n" % Globals.naming_style.define_name(
defval = self.default_value(dependencies)
if defval:
hexcoded = ''.join("\\x%02x" % ord(defval[i:i+1]) for i in range(len(defval)))
result += '#define %s_DEFAULT (const pb_byte_t*)"%s\\x00"\n' % (
result += '#define %s_DEFAULT NULL\n' % Globals.naming_style.define_name(
for field in sorted_fields:
if field.pbtype in ['MESSAGE', 'MSG_W_CB']:
if field.rules == 'ONEOF':
result += "#define %s_%s_%s_MSGTYPE %s\n" % (
result += "#define %s_%s_MSGTYPE %s\n" % (
return result
def enumtype_defines(self):
'''Defines to allow user code to refer to enum type of a specific field'''
result = ''
for field in self.all_fields():
if field.pbtype in ['ENUM', "UENUM"]:
if field.rules == 'ONEOF':
result += "#define %s_%s_%s_ENUMTYPE %s\n" % (
result += "#define %s_%s_ENUMTYPE %s\n" % (
return result
def fields_declaration_cpp_lookup(self):
result = 'template <>\n'
result += 'struct MessageDescriptor<%s> {\n' % (
result += ' static PB_INLINE_CONSTEXPR const pb_size_t fields_array_length = %d;\n' % (self.count_all_fields())
result += ' static inline const pb_msgdesc_t* fields() {\n'
result += ' return &%s_msg;\n' % (
result += ' }\n'
result += '};'
return result
def fields_definition(self, dependencies):
'''Return the field descriptor definition that goes in .pb.c file.'''
width = self.required_descriptor_width(dependencies)
if width == 1:
width = 'AUTO'
result = 'PB_BIND(%s, %s, %s)\n' % (
return result
def required_descriptor_width(self, dependencies):
'''Estimate how many words are necessary for each field descriptor.'''
if self.descriptorsize != nanopb_pb2.DS_AUTO:
return int(self.descriptorsize)
if not self.fields:
return 1
max_tag = max(field.tag for field in self.all_fields())
max_offset = self.data_size(dependencies)
max_arraysize = max((field.max_count or 0) for field in self.all_fields())
max_datasize = max(field.data_size(dependencies) for field in self.all_fields())
if max_arraysize > 0xFFFF:
return 8
elif (max_tag > 0x3FF or max_offset > 0xFFFF or
max_arraysize > 0x0FFF or max_datasize > 0x0FFF):
return 4
elif max_tag > 0x3F or max_offset > 0xFF:
return 2
# NOTE: Macro logic in pb.h ensures that width 1 will
# be raised to 2 automatically for string/submsg fields
# and repeated fields. Thus only tag and offset need to
# be checked.
return 1
def data_size(self, dependencies):
'''Return approximate sizeof(struct) in the compiled code.'''
return sum(f.data_size(dependencies) for f in self.fields)
def encoded_size(self, dependencies):
'''Return the maximum size that this message can take when encoded.
If the size cannot be determined, returns None.
size = EncodedSize(0)
for field in self.fields:
fsize = field.encoded_size(dependencies)
if fsize is None:
return None
size += fsize
return size
def default_value(self, dependencies):
'''Generate serialized protobuf message that contains the
default values for optional fields.'''
if not self.desc:
return b''
if self.desc.options.map_entry:
return b''
optional_only = copy.deepcopy(self.desc)
# Remove fields without default values
# The iteration is done in reverse order to avoid remove() messing up iteration.
for field in reversed(list(optional_only.field)):
parsed_field = self.field_for_tag(field.number)
if parsed_field is None or parsed_field.allocation != 'STATIC':
elif (field.label == FieldD.LABEL_REPEATED or
field.type == FieldD.TYPE_MESSAGE):
elif hasattr(field, 'oneof_index') and field.HasField('oneof_index'):
elif field.type == FieldD.TYPE_ENUM:
# The partial descriptor doesn't include the enum type
# so we fake it with int64.
enumname = names_from_type_name(field.type_name)
enumtype = dependencies[str(enumname)]
except KeyError:
raise Exception("Could not find enum type %s while generating default values for %s.\n" % (enumname,
+ "Try passing all source files to generator at once, or use -I option.")
if not isinstance(enumtype, Enum):
raise Exception("Expected enum type as %s, got %s" % (enumname, repr(enumtype)))
if field.HasField('default_value'):
defvals = [v for n,v in enumtype.values if[-1] == field.default_value]
# If no default is specified, the default is the first value.
defvals = [v for n,v in enumtype.values]
if defvals and defvals[0] != 0:
field.type = FieldD.TYPE_INT64
field.default_value = str(defvals[0])
elif not field.HasField('default_value'):
if len(optional_only.field) == 0:
return b''
optional_only.ClearField(str('enum_type')) += str(id(self))
desc = google.protobuf.descriptor.MakeDescriptor(optional_only)
msg = reflection.MakeClass(desc)()
for field in optional_only.field:
if field.type == FieldD.TYPE_STRING:
setattr(msg,, field.default_value)
elif field.type == FieldD.TYPE_BYTES:
setattr(msg,, codecs.escape_decode(field.default_value)[0])
elif field.type in [FieldD.TYPE_FLOAT, FieldD.TYPE_DOUBLE]:
setattr(msg,, float(field.default_value))
elif field.type == FieldD.TYPE_BOOL:
setattr(msg,, field.default_value == 'true')
setattr(msg,, int(field.default_value))
return msg.SerializeToString()
# ---------------------------------------------------------------------------
# Processing of entire .proto files
# ---------------------------------------------------------------------------
def iterate_messages(desc, flatten = False, names = Names(), comment_path = ()):
'''Recursively find all messages. For each, yield name, DescriptorProto, comment_path.'''
if hasattr(desc, 'message_type'):
submsgs = desc.message_type
comment_path += (ProtoElement.MESSAGE,)
submsgs = desc.nested_type
comment_path += (ProtoElement.NESTED_TYPE,)
for idx, submsg in enumerate(submsgs):
sub_names = names +
sub_path = comment_path + (idx,)
if flatten:
yield Names(, submsg, sub_path
yield sub_names, submsg, sub_path
for x in iterate_messages(submsg, flatten, sub_names, sub_path):
yield x
def iterate_extensions(desc, flatten = False, names = Names()):
'''Recursively find all extensions.
For each, yield name, FieldDescriptorProto.
for extension in desc.extension:
yield names, extension
for subname, subdesc, comment_path in iterate_messages(desc, flatten, names):
for extension in subdesc.extension:
yield subname, extension
def sort_dependencies(messages):
'''Sort a list of Messages based on dependencies.'''
# Construct first level list of dependencies
dependencies = {}
for message in messages:
dependencies[str(] = set(message.get_dependencies())
# Emit messages after all their dependencies have been processed
remaining = list(messages)
remainset = set(str( for m in remaining)
while remaining:
for candidate in remaining:
if not remainset.intersection(dependencies[str(]):
yield candidate
sys.stderr.write("Circular dependency in messages: " + ', '.join(remainset) + " (consider changing to FT_POINTER or FT_CALLBACK)\n")
candidate = remaining.pop(0)
yield candidate
def make_identifier(headername):
'''Make #ifndef identifier that contains uppercase A-Z and digits 0-9'''
result = ""
for c in headername.upper():
if c.isalnum():
result += c
result += '_'
return result
class MangleNames:
'''Handles conversion of type names according to mangle_names option:
M_NONE = 0; // Default, no typename mangling
M_STRIP_PACKAGE = 1; // Strip current package name
M_FLATTEN = 2; // Only use last path component
M_PACKAGE_INITIALS = 3; // Replace the package name by the initials
def __init__(self, fdesc, file_options):
self.file_options = file_options
self.mangle_names = file_options.mangle_names
self.flatten = (self.mangle_names == nanopb_pb2.M_FLATTEN)
self.strip_prefix = None
self.replacement_prefix = None
self.name_mapping = {}
self.reverse_name_mapping = {}
self.canonical_base = Names(fdesc.package.split('.'))
if self.mangle_names == nanopb_pb2.M_STRIP_PACKAGE:
self.strip_prefix = "." + fdesc.package
elif self.mangle_names == nanopb_pb2.M_PACKAGE_INITIALS:
self.strip_prefix = "." + fdesc.package
self.replacement_prefix = ""
for part in fdesc.package.split("."):
self.replacement_prefix += part[0]
elif file_options.package:
self.strip_prefix = "." + fdesc.package
self.replacement_prefix = file_options.package
if self.strip_prefix == '.':
self.strip_prefix = ''
if self.replacement_prefix is not None:
self.base_name = Names(self.replacement_prefix.split('.'))
elif fdesc.package:
self.base_name = Names(fdesc.package.split('.'))
self.base_name = Names()
def create_name(self, names):
'''Create name for a new message / enum.
Argument can be either string or Names instance.
if str(names) not in self.name_mapping:
if self.mangle_names in (nanopb_pb2.M_NONE, nanopb_pb2.M_PACKAGE_INITIALS):
new_name = self.base_name + names
elif self.mangle_names == nanopb_pb2.M_STRIP_PACKAGE:
new_name = Names(names)
elif isinstance(names, Names):
new_name = Names([-1])
new_name = Names(names)
if str(new_name) in self.reverse_name_mapping:
sys.stderr.write("Warning: Duplicate name with mangle_names=%s: %s and %s map to %s\n" %
(self.mangle_names, self.reverse_name_mapping[str(new_name)], names, new_name))
self.name_mapping[str(names)] = new_name
self.reverse_name_mapping[str(new_name)] = self.canonical_base + names
return self.name_mapping[str(names)]
def mangle_field_typename(self, typename):
'''Mangle type name for a submessage / enum crossreference.
Argument is a string.
if self.mangle_names == nanopb_pb2.M_FLATTEN:
return "." + typename.split(".")[-1]
if self.strip_prefix is not None and typename.startswith(self.strip_prefix):
if self.replacement_prefix is not None:
return "." + self.replacement_prefix + typename[len(self.strip_prefix):]
return typename[len(self.strip_prefix):]
if self.file_options.package:
return "." + self.replacement_prefix + typename
return typename
def unmangle(self, names):
return self.reverse_name_mapping.get(str(names), names)
class ProtoFile:
def __init__(self, fdesc, file_options):
'''Takes a FileDescriptorProto and parses it.'''
self.fdesc = fdesc
self.file_options = file_options
self.dependencies = {}
self.math_include_required = False
for message in self.messages:
if message.math_include_required:
self.math_include_required = True
# Some of types used in this file probably come from the file itself.
# Thus it has implicit dependency on itself.
def parse(self):
self.enums = []
self.messages = []
self.extensions = []
self.manglenames = MangleNames(self.fdesc, self.file_options)
# process source code comment locations
# ignores any locations that do not contain any comment information
self.comment_locations = {
tuple(location.path): location
for location in self.fdesc.source_code_info.location
if location.leading_comments or location.leading_detached_comments or location.trailing_comments
for index, enum in enumerate(self.fdesc.enum_type):
name = self.manglenames.create_name(
enum_options = get_nanopb_suboptions(enum, self.file_options, name)
enum_path = (ProtoElement.ENUM, index)
self.enums.append(Enum(name, enum, enum_options, enum_path, self.comment_locations))
for names, message, comment_path in iterate_messages(self.fdesc, self.manglenames.flatten):
name = self.manglenames.create_name(names)
message_options = get_nanopb_suboptions(message, self.file_options, name)
if message_options.skip_message:
message = copy.deepcopy(message)
for field in message.field:
if field.type in (FieldD.TYPE_MESSAGE, FieldD.TYPE_ENUM):
field.type_name = self.manglenames.mangle_field_typename(field.type_name)
self.messages.append(Message(name, message, message_options, comment_path, self.comment_locations))
for index, enum in enumerate(message.enum_type):
name = self.manglenames.create_name(names +
enum_options = get_nanopb_suboptions(enum, message_options, name)
enum_path = comment_path + (ProtoElement.NESTED_ENUM, index)
self.enums.append(Enum(name, enum, enum_options, enum_path, self.comment_locations))
for names, extension in iterate_extensions(self.fdesc, self.manglenames.flatten):
name = self.manglenames.create_name(names +
field_options = get_nanopb_suboptions(extension, self.file_options, name)
extension = copy.deepcopy(extension)
if extension.type in (FieldD.TYPE_MESSAGE, FieldD.TYPE_ENUM):
extension.type_name = self.manglenames.mangle_field_typename(extension.type_name)
if field_options.type != nanopb_pb2.FT_IGNORE:
self.extensions.append(ExtensionField(name, extension, field_options))
def add_dependency(self, other):
for enum in other.enums:
self.dependencies[str(enum.names)] = enum
self.dependencies[str(other.manglenames.unmangle(enum.names))] = enum
enum.protofile = other
for msg in other.messages:
self.dependencies[str(] = msg
self.dependencies[str(other.manglenames.unmangle(] = msg
msg.protofile = other
# Fix field default values where enum short names are used.
for enum in other.enums:
if not enum.options.long_names:
for message in self.messages:
for field in message.all_fields():
if field.default in enum.value_longnames:
idx = enum.value_longnames.index(field.default)
field.default = enum.values[idx][0]
# Fix field data types where enums have negative values.
for enum in other.enums:
if not enum.has_negative():
for message in self.messages:
for field in message.all_fields():
if field.pbtype == 'ENUM' and field.ctype == enum.names:
field.pbtype = 'UENUM'
def generate_header(self, includes, headername, options):
'''Generate content for a header file.
Generates strings, which should be concatenated and stored to file.
yield '/* Automatically generated nanopb header */\n'
if options.notimestamp:
yield '/* Generated by %s */\n\n' % (nanopb_version)
yield '/* Generated by %s at %s. */\n\n' % (nanopb_version, time.asctime())
if self.fdesc.package:
symbol = make_identifier(self.fdesc.package + '_' + headername)
symbol = make_identifier(headername)
yield '#ifndef PB_%s_INCLUDED\n' % symbol
yield '#define PB_%s_INCLUDED\n' % symbol
if self.math_include_required:
yield '#include <math.h>\n'
yield options.libformat % ('pb.h')
except TypeError:
# no %s specified - use whatever was passed in as options.libformat
yield options.libformat
yield '\n'
for incfile in self.file_options.include:
# allow including system headers
if (incfile.startswith('<')):
yield '#include %s\n' % incfile
yield options.genformat % incfile
yield '\n'
for incfile in includes:
noext = os.path.splitext(incfile)[0]
yield options.genformat % (noext + options.extension + options.header_extension)
yield '\n'
if Globals.protoc_insertion_points:
yield '/* @@protoc_insertion_point(includes) */\n'
yield '\n'
yield '#if PB_PROTO_HEADER_VERSION != 40\n'
yield '#error Regenerate this file with the current version of nanopb generator.\n'
yield '#endif\n'
yield '\n'
if self.enums:
yield '/* Enum definitions */\n'
for enum in self.enums:
yield str(enum) + '\n\n'
if self.messages:
yield '/* Struct definitions */\n'
for msg in sort_dependencies(self.messages):
yield msg.types()
yield str(msg) + '\n'
yield '\n'
if self.extensions:
yield '/* Extensions */\n'
for extension in self.extensions:
yield extension.extension_decl()
yield '\n'
yield '#ifdef __cplusplus\n'
yield 'extern "C" {\n'
yield '#endif\n\n'
if self.enums:
yield '/* Helper constants for enums */\n'
for enum in self.enums:
yield enum.auxiliary_defines() + '\n'
for msg in self.messages:
yield msg.enumtype_defines() + '\n'
yield '\n'
if self.messages:
yield '/* Initializer values for message structs */\n'
for msg in self.messages:
identifier = Globals.naming_style.define_name('%s_init_default' %
yield '#define %-40s %s\n' % (identifier, msg.get_initializer(False))
for msg in self.messages:
identifier = Globals.naming_style.define_name('%s_init_zero' %
yield '#define %-40s %s\n' % (identifier, msg.get_initializer(True))
yield '\n'
yield '/* Field tags (for use in manual encoding/decoding) */\n'
for msg in sort_dependencies(self.messages):
for field in msg.fields:
yield field.tags()
for extension in self.extensions:
yield extension.tags()
yield '\n'
yield '/* Struct field encoding specification for nanopb */\n'
for msg in self.messages:
yield msg.fields_declaration(self.dependencies) + '\n'
for msg in self.messages:
yield 'extern const pb_msgdesc_t %s_msg;\n' % Globals.naming_style.type_name(
yield '\n'
yield '/* Defines for backwards compatibility with code written before nanopb-0.4.0 */\n'
for msg in self.messages:
yield '#define %s &%s_msg\n' % (
Globals.naming_style.define_name('%s_fields' %,
yield '\n'
yield '/* Maximum encoded size of messages (where known) */\n'
messagesizes = []
for msg in self.messages:
identifier = '%s_size' %
messagesizes.append((identifier, msg.encoded_size(self.dependencies)))
# If we require a symbol from another file, put a preprocessor if statement
# around it to prevent compilation errors if the symbol is not actually available.
local_defines = [identifier for identifier, msize in messagesizes if msize is not None]
# emit size_unions, if any
oneof_sizes = []
for msg in self.messages:
for f in msg.fields:
if isinstance(f, OneOf):
msize = f.encoded_size(self.dependencies)
if msize is not None:
for msize in oneof_sizes:
guard = msize.get_cpp_guard(local_defines)
if guard:
yield guard
yield msize.get_declarations()
if guard:
yield '#endif\n'
guards = {}
for identifier, msize in messagesizes:
if msize is not None:
cpp_guard = msize.get_cpp_guard(local_defines)
if cpp_guard not in guards:
guards[cpp_guard] = set()
guards[cpp_guard].add('#define %-40s %s' % (
Globals.naming_style.define_name(identifier), msize))
yield '/* %s depends on runtime parameters */\n' % identifier
for guard, values in guards.items():
if guard:
yield guard
for v in sorted(values):
yield v
yield '\n'
if guard:
yield '#endif\n'
yield '\n'
if [msg for msg in self.messages if hasattr(msg,'msgid')]:
yield '/* Message IDs (where set with "msgid" option) */\n'
for msg in self.messages:
if hasattr(msg,'msgid'):
yield '#define PB_MSG_%d %s\n' % (msg.msgid,
yield '\n'
symbol = make_identifier(headername.split('.')[0])
yield '#define %s_MESSAGES \\\n' % symbol
for msg in self.messages:
m = "-1"
msize = msg.encoded_size(self.dependencies)
if msize is not None:
m = msize
if hasattr(msg,'msgid'):
yield '\tPB_MSG(%d,%s,%s) \\\n' % (msg.msgid, m,
yield '\n'
for msg in self.messages:
if hasattr(msg,'msgid'):
yield '#define %s_msgid %d\n' % (, msg.msgid)
yield '\n'
# Check if there is any name mangling active
pairs = [x for x in self.manglenames.reverse_name_mapping.items() if str(x[0]) != str(x[1])]
if pairs:
yield '/* Mapping from canonical names (mangle_names or overridden package name) */\n'
for shortname, longname in pairs:
yield '#define %s %s\n' % (longname, shortname)
yield '\n'
yield '#ifdef __cplusplus\n'
yield '} /* extern "C" */\n'
yield '#endif\n'
if options.cpp_descriptors:
yield '\n'
yield '#ifdef __cplusplus\n'
yield '/* Message descriptors for nanopb */\n'
yield 'namespace nanopb {\n'
for msg in self.messages:
yield msg.fields_declaration_cpp_lookup() + '\n'
yield '} // namespace nanopb\n'
yield '\n'
yield '#endif /* __cplusplus */\n'
yield '\n'
if Globals.protoc_insertion_points:
yield '/* @@protoc_insertion_point(eof) */\n'
# End of header
yield '\n#endif\n'
def generate_source(self, headername, options):
'''Generate content for a source file.'''
yield '/* Automatically generated nanopb constant definitions */\n'
if options.notimestamp:
yield '/* Generated by %s */\n\n' % (nanopb_version)
yield '/* Generated by %s at %s. */\n\n' % (nanopb_version, time.asctime())
yield options.genformat % (headername)
yield '\n'
if Globals.protoc_insertion_points:
yield '/* @@protoc_insertion_point(includes) */\n'
yield '#if PB_PROTO_HEADER_VERSION != 40\n'
yield '#error Regenerate this file with the current version of nanopb generator.\n'
yield '#endif\n'
yield '\n'
# Check if any messages exceed the 64 kB limit of 16-bit pb_size_t
exceeds_64kB = []
for msg in self.messages:
size = msg.data_size(self.dependencies)
if size >= 65536:
if exceeds_64kB:
yield '\n/* The following messages exceed 64kB in size: ' + ', '.join(exceeds_64kB) + ' */\n'
yield '\n/* The PB_FIELD_32BIT compilation option must be defined to support messages that exceed 64 kB in size. */\n'
yield '#ifndef PB_FIELD_32BIT\n'
yield '#error Enable PB_FIELD_32BIT to support messages exceeding 64kB in size: ' + ', '.join(exceeds_64kB) + '\n'
yield '#endif\n'
# Generate the message field definitions (PB_BIND() call)
for msg in self.messages:
yield msg.fields_definition(self.dependencies) + '\n\n'
# Generate pb_extension_type_t definitions if extensions are used in proto file
for ext in self.extensions:
yield ext.extension_def(self.dependencies) + '\n'
# Generate enum_name function if enum_to_string option is defined
for enum in self.enums:
yield enum.enum_to_string_definition() + '\n'
# Add checks for numeric limits
if self.messages:
largest_msg = max(self.messages, key = lambda m: m.count_required_fields())
largest_count = largest_msg.count_required_fields()
if largest_count > 64:
yield '\n/* Check that missing required fields will be properly detected */\n'
yield '#if PB_MAX_REQUIRED_FIELDS < %d\n' % largest_count
yield '#error Properly detecting missing required fields in %s requires \\\n' %
yield ' setting PB_MAX_REQUIRED_FIELDS to %d or more.\n' % largest_count
yield '#endif\n'
# Add check for sizeof(double)
has_double = False
for msg in self.messages:
for field in msg.all_fields():
if field.ctype == 'double':
has_double = True
if has_double:
yield '\n'
yield '#ifndef PB_CONVERT_DOUBLE_FLOAT\n'
yield '/* On some platforms (such as AVR), double is really float.\n'
yield ' * To be able to encode/decode double on these platforms, you need.\n'
yield ' * to define PB_CONVERT_DOUBLE_FLOAT in pb.h or compiler command line.\n'
yield ' */\n'
yield 'PB_STATIC_ASSERT(sizeof(double) == 8, DOUBLE_MUST_BE_8_BYTES)\n'
yield '#endif\n'
yield '\n'
if Globals.protoc_insertion_points:
yield '/* @@protoc_insertion_point(eof) */\n'
# ---------------------------------------------------------------------------
# Options parsing for the .proto files
# ---------------------------------------------------------------------------
from fnmatch import fnmatchcase
def read_options_file(infile):
'''Parse a separate options file to list:
[(namemask, options), ...]
results = []
data =
data = re.sub(r'/\*.*?\*/', '', data, flags = re.MULTILINE)
data = re.sub(r'//.*?$', '', data, flags = re.MULTILINE)
data = re.sub(r'#.*?$', '', data, flags = re.MULTILINE)
for i, line in enumerate(data.split('\n')):
line = line.strip()
if not line:
parts = line.split(None, 1)
if len(parts) < 2:
sys.stderr.write("%s:%d: " % (, i + 1) +
"Option lines should have space between field name and options. " +
"Skipping line: '%s'\n" % line)
opts = nanopb_pb2.NanoPBOptions()
text_format.Merge(parts[1], opts)
except Exception as e:
sys.stderr.write("%s:%d: " % (, i + 1) +
"Unparsable option line: '%s'. " % line +
"Error: %s\n" % str(e))
results.append((parts[0], opts))
return results
def get_nanopb_suboptions(subdesc, options, name):
'''Get copy of options, and merge information from subdesc.'''
new_options = nanopb_pb2.NanoPBOptions()
if hasattr(subdesc, 'syntax') and subdesc.syntax == "proto3":
new_options.proto3 = True
# Handle options defined in a separate file
dotname = '.'.join(
for namemask, options in Globals.separate_options:
if fnmatchcase(dotname, namemask):
# Handle options defined in .proto
if isinstance(subdesc.options, descriptor.FieldOptions):
ext_type = nanopb_pb2.nanopb
elif isinstance(subdesc.options, descriptor.FileOptions):
ext_type = nanopb_pb2.nanopb_fileopt
elif isinstance(subdesc.options, descriptor.MessageOptions):
ext_type = nanopb_pb2.nanopb_msgopt
elif isinstance(subdesc.options, descriptor.EnumOptions):
ext_type = nanopb_pb2.nanopb_enumopt
raise Exception("Unknown options type")
if subdesc.options.HasExtension(ext_type):
ext = subdesc.options.Extensions[ext_type]
if Globals.verbose_options:
sys.stderr.write("Options for " + dotname + ": ")
sys.stderr.write(text_format.MessageToString(new_options) + "\n")
return new_options
# ---------------------------------------------------------------------------
# Command line interface
# ---------------------------------------------------------------------------
import sys
import os.path
from optparse import OptionParser
optparser = OptionParser(
usage = "Usage: [options] file.pb ...",
epilog = "Compile file.pb from file.proto by: 'protoc -ofile.pb file.proto'. " +
"Output will be written to file.pb.h and file.pb.c.")
optparser.add_option("--version", dest="version", action="store_true",
help="Show version info and exit")
optparser.add_option("-x", dest="exclude", metavar="FILE", action="append", default=[],
help="Exclude file from generated #include list.")
optparser.add_option("-e", "--extension", dest="extension", metavar="EXTENSION", default=".pb",
help="Set extension to use instead of '.pb' for generated files. [default: %default]")
optparser.add_option("-H", "--header-extension", dest="header_extension", metavar="EXTENSION", default=".h",
help="Set extension to use for generated header files. [default: %default]")
optparser.add_option("-S", "--source-extension", dest="source_extension", metavar="EXTENSION", default=".c",
help="Set extension to use for generated source files. [default: %default]")
optparser.add_option("-f", "--options-file", dest="options_file", metavar="FILE", default="%s.options",
help="Set name of a separate generator options file.")
optparser.add_option("-I", "--options-path", "--proto-path", dest="options_path", metavar="DIR",
action="append", default = [],
help="Search path for .options and .proto files. Also determines relative paths for output directory structure.")
optparser.add_option("--error-on-unmatched", dest="error_on_unmatched", action="store_true", default=False,
help ="Stop generation if there are unmatched fields in options file")
optparser.add_option("--no-error-on-unmatched", dest="error_on_unmatched", action="store_false", default=False,
help ="Continue generation if there are unmatched fields in options file (default)")
optparser.add_option("-D", "--output-dir", dest="output_dir",
metavar="OUTPUTDIR", default=None,
help="Output directory of .pb.h and .pb.c files")
optparser.add_option("-Q", "--generated-include-format", dest="genformat",
metavar="FORMAT", default='#include "%s"',
help="Set format string to use for including other .pb.h files. Value can be 'quote', 'bracket' or a format string. [default: %default]")
optparser.add_option("-L", "--library-include-format", dest="libformat",
metavar="FORMAT", default='#include <%s>',
help="Set format string to use for including the nanopb pb.h header. Value can be 'quote', 'bracket' or a format string. [default: %default]")
optparser.add_option("--strip-path", dest="strip_path", action="store_true", default=False,
help="Strip directory path from #included .pb.h file name")
optparser.add_option("--no-strip-path", dest="strip_path", action="store_false",
help="Opposite of --strip-path (default since 0.4.0)")
optparser.add_option("--cpp-descriptors", action="store_true",
help="Generate C++ descriptors to lookup by type (e.g. pb_field_t for a message)")
optparser.add_option("-T", "--no-timestamp", dest="notimestamp", action="store_true", default=True,
help="Don't add timestamp to .pb.h and .pb.c preambles (default since 0.4.0)")
optparser.add_option("-t", "--timestamp", dest="notimestamp", action="store_false", default=True,
help="Add timestamp to .pb.h and .pb.c preambles")
optparser.add_option("-q", "--quiet", dest="quiet", action="store_true", default=False,
help="Don't print anything except errors.")
optparser.add_option("-v", "--verbose", dest="verbose", action="store_true", default=False,
help="Print more information.")
optparser.add_option("-s", dest="settings", metavar="OPTION:VALUE", action="append", default=[],
help="Set generator option (max_size, max_count etc.).")
optparser.add_option("--protoc-opt", dest="protoc_opts", action="append", default = [], metavar="OPTION",
help="Pass an option to protoc when compiling .proto files")
optparser.add_option("--protoc-insertion-points", dest="protoc_insertion_points", action="store_true", default=False,
help="Include insertion point comments in output for use by custom protoc plugins")
optparser.add_option("-C", "--c-style", dest="c_style", action="store_true", default=False,
help="Use C naming convention.")
def process_cmdline(args, is_plugin):
'''Process command line options. Returns list of options, filenames.'''
options, filenames = optparser.parse_args(args)
if options.version:
if is_plugin:
sys.stderr.write('%s\n' % (nanopb_version))
if not filenames and not is_plugin:
if options.quiet:
options.verbose = False
include_formats = {'quote': '#include "%s"', 'bracket': '#include <%s>'}
options.libformat = include_formats.get(options.libformat, options.libformat)
options.genformat = include_formats.get(options.genformat, options.genformat)
if options.c_style:
Globals.naming_style = NamingStyleC()
Globals.verbose_options = options.verbose
if options.verbose:
sys.stderr.write("Nanopb version %s\n" % nanopb_version)
sys.stderr.write('Google Python protobuf library imported from %s, version %s\n'
% (google.protobuf.__file__, google.protobuf.__version__))
return options, filenames
def parse_file(filename, fdesc, options):
'''Parse a single file. Returns a ProtoFile instance.'''
toplevel_options = nanopb_pb2.NanoPBOptions()
for s in options.settings:
if ':' not in s and '=' in s:
s = s.replace('=', ':')
text_format.Merge(s, toplevel_options)
if not fdesc:
data = open(filename, 'rb').read()
fdesc = descriptor.FileDescriptorSet.FromString(data).file[0]
# Check if there is a separate .options file
had_abspath = False
optfilename = options.options_file % os.path.splitext(filename)[0]
except TypeError:
# No %s specified, use the filename as-is
optfilename = options.options_file
had_abspath = True
paths = ['.'] + options.options_path
for p in paths:
if os.path.isfile(os.path.join(p, optfilename)):
optfilename = os.path.join(p, optfilename)
if options.verbose:
sys.stderr.write('Reading options from ' + optfilename + '\n')
Globals.separate_options = read_options_file(open(optfilename, 'r', encoding = 'utf-8'))
# If we are given a full filename and it does not exist, give an error.
# However, don't give error when we automatically look for .options file
# with the same name as .proto.
if options.verbose or had_abspath:
sys.stderr.write('Options file not found: ' + optfilename + '\n')
Globals.separate_options = []
Globals.matched_namemasks = set()
Globals.protoc_insertion_points = options.protoc_insertion_points
# Parse the file
file_options = get_nanopb_suboptions(fdesc, toplevel_options, Names([filename]))
f = ProtoFile(fdesc, file_options)
f.optfilename = optfilename
return f
def process_file(filename, fdesc, options, other_files = {}):
'''Process a single file.
filename: The full path to the .proto or .pb source file, as string.
fdesc: The loaded FileDescriptorSet, or None to read from the input file.
options: Command line options as they come from OptionsParser.
Returns a dict:
{'headername': Name of header file,
'headerdata': Data for the .h header file,
'sourcename': Name of the source code file,
'sourcedata': Data for the .c source code file
f = parse_file(filename, fdesc, options)
# Check the list of dependencies, and if they are available in other_files,
# add them to be considered for import resolving. Recursively add any files
# imported by the dependencies.
deps = list(f.fdesc.dependency)
while deps:
dep = deps.pop(0)
if dep in other_files:
deps += list(other_files[dep].fdesc.dependency)
# Decide the file names
noext = os.path.splitext(filename)[0]
headername = noext + options.extension + options.header_extension
sourcename = noext + options.extension + options.source_extension
if options.strip_path:
headerbasename = os.path.basename(headername)
headerbasename = headername
# List of .proto files that should not be included in the C header file
# even if they are mentioned in the source .proto.
excludes = ['nanopb.proto', 'google/protobuf/descriptor.proto'] + options.exclude + list(f.file_options.exclude)
includes = [d for d in f.fdesc.dependency if d not in excludes]
headerdata = ''.join(f.generate_header(includes, headerbasename, options))
sourcedata = ''.join(f.generate_source(headerbasename, options))
# Check if there were any lines in .options that did not match a member
unmatched = [n for n,o in Globals.separate_options if n not in Globals.matched_namemasks]
if unmatched:
if options.error_on_unmatched:
raise Exception("Following patterns in " + f.optfilename + " did not match any fields: "
+ ', '.join(unmatched));
elif not options.quiet:
sys.stderr.write("Following patterns in " + f.optfilename + " did not match any fields: "
+ ', '.join(unmatched) + "\n")
if not Globals.verbose_options:
sys.stderr.write("Use protoc --nanopb-out=-v:. to see a list of the field names.\n")
return {'headername': headername, 'headerdata': headerdata,
'sourcename': sourcename, 'sourcedata': sourcedata}
def main_cli():
'''Main function when invoked directly from the command line.'''
options, filenames = process_cmdline(sys.argv[1:], is_plugin = False)
if options.output_dir and not os.path.exists(options.output_dir):
sys.stderr.write("\noutput_dir does not exist: %s\n" % options.output_dir)
# Load .pb files into memory and compile any .proto files.
include_path = ['-I%s' % p for p in options.options_path]
all_fdescs = {}
out_fdescs = {}
for filename in filenames:
if filename.endswith(".proto"):
with TemporaryDirectory() as tmpdir:
tmpname = os.path.join(tmpdir, os.path.basename(filename) + ".pb")
args = ["protoc"] + include_path
args += options.protoc_opts
args += ['--include_imports', '--include_source_info', '-o' + tmpname, filename]
status = invoke_protoc(args)
if status != 0: sys.exit(status)
data = open(tmpname, 'rb').read()
data = open(filename, 'rb').read()
fdescs = descriptor.FileDescriptorSet.FromString(data).file
last_fdesc = fdescs[-1]
for fdesc in fdescs:
all_fdescs[] = fdesc
out_fdescs[] = last_fdesc
# Process any include files first, in order to have them
# available as dependencies
other_files = {}
for fdesc in all_fdescs.values():
other_files[] = parse_file(, fdesc, options)
# Then generate the headers / sources
for fdesc in out_fdescs.values():
results = process_file(, fdesc, options, other_files)
base_dir = options.output_dir or ''
to_write = [
(os.path.join(base_dir, results['headername']), results['headerdata']),
(os.path.join(base_dir, results['sourcename']), results['sourcedata']),
if not options.quiet:
paths = " and ".join([x[0] for x in to_write])
sys.stderr.write("Writing to %s\n" % paths)
for path, data in to_write:
dirname = os.path.dirname(path)
if dirname and not os.path.exists(dirname):
with open(path, 'w') as f:
def main_plugin():
'''Main function when invoked as a protoc plugin.'''
import io, sys
if sys.platform == "win32":
import os, msvcrt
# Set stdin and stdout to binary mode
msvcrt.setmode(sys.stdin.fileno(), os.O_BINARY)
msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
data =, "rb").read()
request = plugin_pb2.CodeGeneratorRequest.FromString(data)
# Versions of Python prior to 2.7.3 do not support unicode
# input to shlex.split(). Try to convert to str if possible.
params = str(request.parameter)
except UnicodeEncodeError:
params = request.parameter
if ',' not in params and ' -' in params:
# Nanopb has traditionally supported space as separator in options
args = shlex.split(params)
# Protoc separates options passed to plugins by comma
# This allows also giving --nanopb_opt option multiple times.
lex = shlex.shlex(params)
lex.whitespace_split = True
lex.whitespace = ','
lex.commenters = ''
args = list(lex)
optparser.usage = "protoc --nanopb_out=outdir [--nanopb_opt=option] ['--nanopb_opt=option with spaces'] file.proto"
optparser.epilog = "Output will be written to file.pb.h and file.pb.c."
if '-h' in args or '--help' in args:
# By default optparser prints help to stdout, which doesn't work for
# protoc plugins.
options, dummy = process_cmdline(args, is_plugin = True)
response = plugin_pb2.CodeGeneratorResponse()
# Google's protoc does not currently indicate the full path of proto files.
# Instead always add the main file path to the search dirs, that works for
# the common case.
import os.path
# Process any include files first, in order to have them
# available as dependencies
other_files = {}
for fdesc in request.proto_file:
other_files[] = parse_file(, fdesc, options)
for filename in request.file_to_generate:
for fdesc in request.proto_file:
if == filename:
results = process_file(filename, fdesc, options, other_files)
f = response.file.add() = results['headername']
f.content = results['headerdata']
f = response.file.add() = results['sourcename']
f.content = results['sourcedata']
if hasattr(plugin_pb2.CodeGeneratorResponse, "FEATURE_PROTO3_OPTIONAL"):
response.supported_features = plugin_pb2.CodeGeneratorResponse.FEATURE_PROTO3_OPTIONAL, "wb").write(response.SerializeToString())
if __name__ == '__main__':
# Check if we are running as a plugin under protoc
if 'protoc-gen-' in sys.argv[0] or '--protoc-plugin' in sys.argv: