3 from __future__ import unicode_literals
5 '''Generate header file for nanopb from a ProtoBuf FileDescriptorSet.'''
6 nanopb_version = "nanopb-0.3.4-dev"
10 from functools import reduce
13 # Add some dummy imports to keep packaging tools happy.
14 import google, distutils.util # bbfreeze seems to need these
15 import pkg_resources # pyinstaller / protobuf 2.5 seem to need these
17 # Don't care, we will error out later if it is actually important.
21 import google.protobuf.text_format as text_format
22 import google.protobuf.descriptor_pb2 as descriptor
25 *************************************************************
26 *** Could not import the Google protobuf Python libraries ***
27 *** Try installing package 'python-protobuf' or similar. ***
28 *************************************************************
33 import proto.nanopb_pb2 as nanopb_pb2
34 import proto.plugin_pb2 as plugin_pb2
37 ********************************************************************
38 *** Failed to import the protocol definitions for generator. ***
39 *** You have to run 'make' in the nanopb/generator/proto folder. ***
40 ********************************************************************
44 # ---------------------------------------------------------------------------
45 # Generation of single fields
46 # ---------------------------------------------------------------------------
51 # Values are tuple (c type, pb type, encoded size, int_size_allowed)
52 FieldD = descriptor.FieldDescriptorProto
54 FieldD.TYPE_BOOL: ('bool', 'BOOL', 1, False),
55 FieldD.TYPE_DOUBLE: ('double', 'DOUBLE', 8, False),
56 FieldD.TYPE_FIXED32: ('uint32_t', 'FIXED32', 4, False),
57 FieldD.TYPE_FIXED64: ('uint64_t', 'FIXED64', 8, False),
58 FieldD.TYPE_FLOAT: ('float', 'FLOAT', 4, False),
59 FieldD.TYPE_INT32: ('int32_t', 'INT32', 10, True),
60 FieldD.TYPE_INT64: ('int64_t', 'INT64', 10, True),
61 FieldD.TYPE_SFIXED32: ('int32_t', 'SFIXED32', 4, False),
62 FieldD.TYPE_SFIXED64: ('int64_t', 'SFIXED64', 8, False),
63 FieldD.TYPE_SINT32: ('int32_t', 'SINT32', 5, True),
64 FieldD.TYPE_SINT64: ('int64_t', 'SINT64', 10, True),
65 FieldD.TYPE_UINT32: ('uint32_t', 'UINT32', 5, True),
66 FieldD.TYPE_UINT64: ('uint64_t', 'UINT64', 10, True)
69 # Integer size overrides (from .proto settings)
71 nanopb_pb2.IS_8: 'int8_t',
72 nanopb_pb2.IS_16: 'int16_t',
73 nanopb_pb2.IS_32: 'int32_t',
74 nanopb_pb2.IS_64: 'int64_t',
78 '''Keeps a set of nested names and formats them to C identifier.'''
79 def __init__(self, parts = ()):
80 if isinstance(parts, Names):
82 self.parts = tuple(parts)
85 return '_'.join(self.parts)
87 def __add__(self, other):
88 if isinstance(other, str):
89 return Names(self.parts + (other,))
90 elif isinstance(other, tuple):
91 return Names(self.parts + other)
93 raise ValueError("Name parts should be of type str")
95 def __eq__(self, other):
96 return isinstance(other, Names) and self.parts == other.parts
98 def names_from_type_name(type_name):
99 '''Parse Names() from FieldDescriptorProto type_name'''
100 if type_name[0] != '.':
101 raise NotImplementedError("Lookup of non-absolute type names is not supported")
102 return Names(type_name[1:].split('.'))
104 def varint_max_size(max_value):
105 '''Returns the maximum number of bytes a varint can take when encoded.'''
107 max_value = 2**64 - max_value
108 for i in range(1, 11):
109 if (max_value >> (i * 7)) == 0:
111 raise ValueError("Value too large for varint: " + str(max_value))
113 assert varint_max_size(-1) == 10
114 assert varint_max_size(0) == 1
115 assert varint_max_size(127) == 1
116 assert varint_max_size(128) == 2
119 '''Class used to represent the encoded size of a field or a message.
120 Consists of a combination of symbolic sizes and integer sizes.'''
121 def __init__(self, value = 0, symbols = []):
122 if isinstance(value, (str, Names)):
123 symbols = [str(value)]
126 self.symbols = symbols
128 def __add__(self, other):
129 if isinstance(other, int):
130 return EncodedSize(self.value + other, self.symbols)
131 elif isinstance(other, (str, Names)):
132 return EncodedSize(self.value, self.symbols + [str(other)])
133 elif isinstance(other, EncodedSize):
134 return EncodedSize(self.value + other.value, self.symbols + other.symbols)
136 raise ValueError("Cannot add size: " + repr(other))
138 def __mul__(self, other):
139 if isinstance(other, int):
140 return EncodedSize(self.value * other, [str(other) + '*' + s for s in self.symbols])
142 raise ValueError("Cannot multiply size: " + repr(other))
146 return str(self.value)
148 return '(' + str(self.value) + ' + ' + ' + '.join(self.symbols) + ')'
150 def upperlimit(self):
157 def __init__(self, names, desc, enum_options):
158 '''desc is EnumDescriptorProto'''
160 self.options = enum_options
161 self.names = names + desc.name
163 if enum_options.long_names:
164 self.values = [(self.names + x.name, x.number) for x in desc.value]
166 self.values = [(names + x.name, x.number) for x in desc.value]
168 self.value_longnames = [self.names + x.name for x in desc.value]
169 self.packed = enum_options.packed_enum
171 def has_negative(self):
172 for n, v in self.values:
177 def encoded_size(self):
178 return max([varint_max_size(v) for n,v in self.values])
181 result = 'typedef enum _%s {\n' % self.names
182 result += ',\n'.join([" %s = %d" % x for x in self.values])
186 result += ' pb_packed'
188 result += ' %s;' % self.names
190 if not self.options.long_names:
191 # Define the long names always so that enum value references
192 # from other files work properly.
193 for i, x in enumerate(self.values):
194 result += '\n#define %s %s' % (self.value_longnames[i], x[0])
199 def __init__(self, worst = 0, checks = [], field_name = 'undefined'):
200 if isinstance(worst, list):
201 self.worst = max(i for i in worst if i is not None)
205 self.worst_field = field_name
208 def extend(self, extend, field_name = None):
209 self.worst = max(self.worst, extend.worst)
211 if self.worst == extend.worst:
212 self.worst_field = extend.worst_field
214 self.checks.extend(extend.checks)
217 def __init__(self, struct_name, desc, field_options):
218 '''desc is FieldDescriptorProto'''
219 self.tag = desc.number
220 self.struct_name = struct_name
221 self.union_name = None
222 self.name = desc.name
225 self.max_count = None
230 # Parse field options
231 if field_options.HasField("max_size"):
232 self.max_size = field_options.max_size
234 if field_options.HasField("max_count"):
235 self.max_count = field_options.max_count
237 if desc.HasField('default_value'):
238 self.default = desc.default_value
240 # Check field rules, i.e. required/optional/repeated.
242 if desc.label == FieldD.LABEL_REQUIRED:
243 self.rules = 'REQUIRED'
244 elif desc.label == FieldD.LABEL_OPTIONAL:
245 self.rules = 'OPTIONAL'
246 elif desc.label == FieldD.LABEL_REPEATED:
247 self.rules = 'REPEATED'
248 if self.max_count is None:
249 can_be_static = False
251 self.array_decl = '[%d]' % self.max_count
253 raise NotImplementedError(desc.label)
255 # Check if the field can be implemented with static allocation
256 # i.e. whether the data size is known.
257 if desc.type == FieldD.TYPE_STRING and self.max_size is None:
258 can_be_static = False
260 if desc.type == FieldD.TYPE_BYTES and self.max_size is None:
261 can_be_static = False
263 # Decide how the field data will be allocated
264 if field_options.type == nanopb_pb2.FT_DEFAULT:
266 field_options.type = nanopb_pb2.FT_STATIC
268 field_options.type = nanopb_pb2.FT_CALLBACK
270 if field_options.type == nanopb_pb2.FT_STATIC and not can_be_static:
271 raise Exception("Field %s is defined as static, but max_size or "
272 "max_count is not given." % self.name)
274 if field_options.type == nanopb_pb2.FT_STATIC:
275 self.allocation = 'STATIC'
276 elif field_options.type == nanopb_pb2.FT_POINTER:
277 self.allocation = 'POINTER'
278 elif field_options.type == nanopb_pb2.FT_CALLBACK:
279 self.allocation = 'CALLBACK'
281 raise NotImplementedError(field_options.type)
283 # Decide the C data type to use in the struct.
284 if desc.type in datatypes:
285 self.ctype, self.pbtype, self.enc_size, isa = datatypes[desc.type]
287 # Override the field size if user wants to use smaller integers
288 if isa and field_options.int_size != nanopb_pb2.IS_DEFAULT:
289 self.ctype = intsizes[field_options.int_size]
290 if desc.type == FieldD.TYPE_UINT32 or desc.type == FieldD.TYPE_UINT64:
291 self.ctype = 'u' + self.ctype;
292 elif desc.type == FieldD.TYPE_ENUM:
294 self.ctype = names_from_type_name(desc.type_name)
295 if self.default is not None:
296 self.default = self.ctype + self.default
297 self.enc_size = None # Needs to be filled in when enum values are known
298 elif desc.type == FieldD.TYPE_STRING:
299 self.pbtype = 'STRING'
301 if self.allocation == 'STATIC':
303 self.array_decl += '[%d]' % self.max_size
304 self.enc_size = varint_max_size(self.max_size) + self.max_size
305 elif desc.type == FieldD.TYPE_BYTES:
306 self.pbtype = 'BYTES'
307 if self.allocation == 'STATIC':
308 self.ctype = self.struct_name + self.name + 't'
309 self.enc_size = varint_max_size(self.max_size) + self.max_size
310 elif self.allocation == 'POINTER':
311 self.ctype = 'pb_bytes_array_t'
312 elif desc.type == FieldD.TYPE_MESSAGE:
313 self.pbtype = 'MESSAGE'
314 self.ctype = self.submsgname = names_from_type_name(desc.type_name)
315 self.enc_size = None # Needs to be filled in after the message type is available
317 raise NotImplementedError(desc.type)
319 def __lt__(self, other):
320 return self.tag < other.tag
324 if self.allocation == 'POINTER':
325 if self.rules == 'REPEATED':
326 result += ' pb_size_t ' + self.name + '_count;\n'
328 if self.pbtype == 'MESSAGE':
329 # Use struct definition, so recursive submessages are possible
330 result += ' struct _%s *%s;' % (self.ctype, self.name)
331 elif self.rules == 'REPEATED' and self.pbtype in ['STRING', 'BYTES']:
332 # String/bytes arrays need to be defined as pointers to pointers
333 result += ' %s **%s;' % (self.ctype, self.name)
335 result += ' %s *%s;' % (self.ctype, self.name)
336 elif self.allocation == 'CALLBACK':
337 result += ' pb_callback_t %s;' % self.name
339 if self.rules == 'OPTIONAL' and self.allocation == 'STATIC':
340 result += ' bool has_' + self.name + ';\n'
341 elif self.rules == 'REPEATED' and self.allocation == 'STATIC':
342 result += ' pb_size_t ' + self.name + '_count;\n'
343 result += ' %s %s%s;' % (self.ctype, self.name, self.array_decl)
347 '''Return definitions for any special types this field might need.'''
348 if self.pbtype == 'BYTES' and self.allocation == 'STATIC':
349 result = 'typedef PB_BYTES_ARRAY_T(%d) %s;\n' % (self.max_size, self.ctype)
354 def get_dependencies(self):
355 '''Get list of type names used by this field.'''
356 if self.allocation == 'STATIC':
357 return [str(self.ctype)]
361 def get_initializer(self, null_init, inner_init_only = False):
362 '''Return literal expression for this field's default value.
363 null_init: If True, initialize to a 0 value instead of default from .proto
364 inner_init_only: If True, exclude initialization for any count/has fields
368 if self.pbtype == 'MESSAGE':
370 inner_init = '%s_init_zero' % self.ctype
372 inner_init = '%s_init_default' % self.ctype
373 elif self.default is None or null_init:
374 if self.pbtype == 'STRING':
376 elif self.pbtype == 'BYTES':
377 inner_init = '{0, {0}}'
378 elif self.pbtype in ('ENUM', 'UENUM'):
379 inner_init = '(%s)0' % self.ctype
383 if self.pbtype == 'STRING':
384 inner_init = self.default.replace('"', '\\"')
385 inner_init = '"' + inner_init + '"'
386 elif self.pbtype == 'BYTES':
387 data = ['0x%02x' % ord(c) for c in self.default]
389 inner_init = '{0, {0}}'
391 inner_init = '{%d, {%s}}' % (len(data), ','.join(data))
392 elif self.pbtype in ['FIXED32', 'UINT32']:
393 inner_init = str(self.default) + 'u'
394 elif self.pbtype in ['FIXED64', 'UINT64']:
395 inner_init = str(self.default) + 'ull'
396 elif self.pbtype in ['SFIXED64', 'INT64']:
397 inner_init = str(self.default) + 'll'
399 inner_init = str(self.default)
405 if self.allocation == 'STATIC':
406 if self.rules == 'REPEATED':
408 outer_init += ', '.join([inner_init] * self.max_count)
410 elif self.rules == 'OPTIONAL':
411 outer_init = 'false, ' + inner_init
413 outer_init = inner_init
414 elif self.allocation == 'POINTER':
415 if self.rules == 'REPEATED':
416 outer_init = '0, NULL'
419 elif self.allocation == 'CALLBACK':
420 if self.pbtype == 'EXTENSION':
423 outer_init = '{{NULL}, NULL}'
427 def default_decl(self, declaration_only = False):
428 '''Return definition for this field's default value.'''
429 if self.default is None:
433 default = self.get_initializer(False, True)
436 if self.pbtype == 'STRING':
437 if self.allocation != 'STATIC':
438 return None # Not implemented
439 array_decl = '[%d]' % self.max_size
440 elif self.pbtype == 'BYTES':
441 if self.allocation != 'STATIC':
442 return None # Not implemented
445 return 'extern const %s %s_default%s;' % (ctype, self.struct_name + self.name, array_decl)
447 return 'const %s %s_default%s = %s;' % (ctype, self.struct_name + self.name, array_decl, default)
450 '''Return the #define for the tag number of this field.'''
451 identifier = '%s_%s_tag' % (self.struct_name, self.name)
452 return '#define %-40s %d\n' % (identifier, self.tag)
454 def pb_field_t(self, prev_field_name):
455 '''Return the pb_field_t initializer to use in the constant array.
456 prev_field_name is the name of the previous field or None.
459 if self.rules == 'ONEOF':
460 result = ' PB_ONEOF_FIELD(%s, ' % self.union_name
462 result = ' PB_FIELD('
464 result += '%3d, ' % self.tag
465 result += '%-8s, ' % self.pbtype
466 result += '%s, ' % self.rules
467 result += '%-8s, ' % self.allocation
468 result += '%s, ' % ("FIRST" if not prev_field_name else "OTHER")
469 result += '%s, ' % self.struct_name
470 result += '%s, ' % self.name
471 result += '%s, ' % (prev_field_name or self.name)
473 if self.pbtype == 'MESSAGE':
474 result += '&%s_fields)' % self.submsgname
475 elif self.default is None:
477 elif self.pbtype in ['BYTES', 'STRING'] and self.allocation != 'STATIC':
478 result += '0)' # Arbitrary size default values not implemented
479 elif self.rules == 'OPTEXT':
480 result += '0)' # Default value for extensions is not implemented
482 result += '&%s_default)' % (self.struct_name + self.name)
486 def largest_field_value(self):
487 '''Determine if this field needs 16bit or 32bit pb_field_t structure to compile properly.
488 Returns numeric value or a C-expression for assert.'''
490 if self.pbtype == 'MESSAGE':
491 if self.rules == 'REPEATED' and self.allocation == 'STATIC':
492 check.append('pb_membersize(%s, %s[0])' % (self.struct_name, self.name))
493 elif self.rules == 'ONEOF':
494 check.append('pb_membersize(%s, %s.%s)' % (self.struct_name, self.union_name, self.name))
496 check.append('pb_membersize(%s, %s)' % (self.struct_name, self.name))
498 return FieldMaxSize([self.tag, self.max_size, self.max_count],
500 ('%s.%s' % (self.struct_name, self.name)))
502 def encoded_size(self, dependencies):
503 '''Return the maximum size that this field can take when encoded,
504 including the field tag. If the size cannot be determined, returns
507 if self.allocation != 'STATIC':
510 if self.pbtype == 'MESSAGE':
511 if str(self.submsgname) in dependencies:
512 submsg = dependencies[str(self.submsgname)]
513 encsize = submsg.encoded_size(dependencies)
515 return None # Submessage size is indeterminate
517 # Include submessage length prefix
518 encsize += varint_max_size(encsize.upperlimit())
520 # Submessage cannot be found, this currently occurs when
521 # the submessage type is defined in a different file and
522 # not using the protoc plugin.
523 # Instead of direct numeric value, reference the size that
524 # has been #defined in the other file.
525 encsize = EncodedSize(self.submsgname + 'size')
527 # We will have to make a conservative assumption on the length
528 # prefix size, though.
531 elif self.pbtype in ['ENUM', 'UENUM']:
532 if str(self.ctype) in dependencies:
533 enumtype = dependencies[str(self.ctype)]
534 encsize = enumtype.encoded_size()
536 # Conservative assumption
539 elif self.enc_size is None:
540 raise RuntimeError("Could not determine encoded size for %s.%s"
541 % (self.struct_name, self.name))
543 encsize = EncodedSize(self.enc_size)
545 encsize += varint_max_size(self.tag << 3) # Tag + wire type
547 if self.rules == 'REPEATED':
548 # Decoders must be always able to handle unpacked arrays.
549 # Therefore we have to reserve space for it, even though
550 # we emit packed arrays ourselves.
551 encsize *= self.max_count
556 class ExtensionRange(Field):
557 def __init__(self, struct_name, range_start, field_options):
558 '''Implements a special pb_extension_t* field in an extensible message
559 structure. The range_start signifies the index at which the extensions
560 start. Not necessarily all tags above this are extensions, it is merely
561 a speed optimization.
563 self.tag = range_start
564 self.struct_name = struct_name
565 self.name = 'extensions'
566 self.pbtype = 'EXTENSION'
567 self.rules = 'OPTIONAL'
568 self.allocation = 'CALLBACK'
569 self.ctype = 'pb_extension_t'
576 return ' pb_extension_t *extensions;'
584 def encoded_size(self, dependencies):
585 # We exclude extensions from the count, because they cannot be known
586 # until runtime. Other option would be to return None here, but this
587 # way the value remains useful if extensions are not used.
588 return EncodedSize(0)
590 class ExtensionField(Field):
591 def __init__(self, struct_name, desc, field_options):
592 self.fullname = struct_name + desc.name
593 self.extendee_name = names_from_type_name(desc.extendee)
594 Field.__init__(self, self.fullname + 'struct', desc, field_options)
596 if self.rules != 'OPTIONAL':
600 self.rules = 'OPTEXT'
603 '''Return the #define for the tag number of this field.'''
604 identifier = '%s_tag' % self.fullname
605 return '#define %-40s %d\n' % (identifier, self.tag)
607 def extension_decl(self):
608 '''Declaration of the extension type in the .pb.h file'''
610 msg = '/* Extension field %s was skipped because only "optional"\n' % self.fullname
611 msg +=' type of extension fields is currently supported. */\n'
614 return ('extern const pb_extension_type_t %s; /* field type: %s */\n' %
615 (self.fullname, str(self).strip()))
617 def extension_def(self):
618 '''Definition of the extension type in the .pb.c file'''
623 result = 'typedef struct {\n'
625 result += '\n} %s;\n\n' % self.struct_name
626 result += ('static const pb_field_t %s_field = \n %s;\n\n' %
627 (self.fullname, self.pb_field_t(None)))
628 result += 'const pb_extension_type_t %s = {\n' % self.fullname
631 result += ' &%s_field\n' % self.fullname
636 # ---------------------------------------------------------------------------
637 # Generation of oneofs (unions)
638 # ---------------------------------------------------------------------------
641 def __init__(self, struct_name, oneof_desc):
642 self.struct_name = struct_name
643 self.name = oneof_desc.name
645 self.pbtype = 'oneof'
647 self.allocation = 'ONEOF'
651 def add_field(self, field):
652 if field.allocation == 'CALLBACK':
653 raise Exception("Callback fields inside of oneof are not supported"
654 + " (field %s)" % field.name)
656 field.union_name = self.name
657 field.rules = 'ONEOF'
658 self.fields.append(field)
659 self.fields.sort(key = lambda f: f.tag)
661 # Sort by the lowest tag number inside union
662 self.tag = min([f.tag for f in self.fields])
667 result += ' pb_size_t which_' + self.name + ";\n"
668 result += ' union {\n'
669 for f in self.fields:
670 result += ' ' + str(f).replace('\n', '\n ') + '\n'
671 result += ' } ' + self.name + ';'
675 return ''.join([f.types() for f in self.fields])
677 def get_dependencies(self):
679 for f in self.fields:
680 deps += f.get_dependencies()
683 def get_initializer(self, null_init):
684 return '0, {' + self.fields[0].get_initializer(null_init) + '}'
686 def default_decl(self, declaration_only = False):
690 return '\n'.join([f.tags() for f in self.fields])
692 def pb_field_t(self, prev_field_name):
693 result = ',\n'.join([f.pb_field_t(prev_field_name) for f in self.fields])
696 def largest_field_value(self):
697 largest = FieldMaxSize()
698 for f in self.fields:
699 largest.extend(f.largest_field_value())
702 def encoded_size(self, dependencies):
703 largest = EncodedSize(0)
704 for f in self.fields:
705 size = f.encoded_size(dependencies)
709 return None # Cannot resolve maximum of symbols
710 elif size.value > largest.value:
715 # ---------------------------------------------------------------------------
716 # Generation of messages (structures)
717 # ---------------------------------------------------------------------------
721 def __init__(self, names, desc, message_options):
727 if message_options.msgid:
728 self.msgid = message_options.msgid
730 if hasattr(desc, 'oneof_decl'):
731 for i, f in enumerate(desc.oneof_decl):
732 oneof_options = get_nanopb_suboptions(desc, message_options, self.name + f.name)
733 if oneof_options.no_unions:
734 no_unions.append(i) # No union, but add fields normally
735 elif oneof_options.type == nanopb_pb2.FT_IGNORE:
736 pass # No union and skip fields also
738 oneof = OneOf(self.name, f)
739 self.oneofs[i] = oneof
740 self.fields.append(oneof)
743 field_options = get_nanopb_suboptions(f, message_options, self.name + f.name)
744 if field_options.type == nanopb_pb2.FT_IGNORE:
747 field = Field(self.name, f, field_options)
748 if (hasattr(f, 'oneof_index') and
749 f.HasField('oneof_index') and
750 f.oneof_index not in no_unions):
751 if f.oneof_index in self.oneofs:
752 self.oneofs[f.oneof_index].add_field(field)
754 self.fields.append(field)
756 if len(desc.extension_range) > 0:
757 field_options = get_nanopb_suboptions(desc, message_options, self.name + 'extensions')
758 range_start = min([r.start for r in desc.extension_range])
759 if field_options.type != nanopb_pb2.FT_IGNORE:
760 self.fields.append(ExtensionRange(self.name, range_start, field_options))
762 self.packed = message_options.packed_struct
763 self.ordered_fields = self.fields[:]
764 self.ordered_fields.sort()
766 def get_dependencies(self):
767 '''Get list of type names that this structure refers to.'''
769 for f in self.fields:
770 deps += f.get_dependencies()
774 result = 'typedef struct _%s {\n' % self.name
776 if not self.ordered_fields:
777 # Empty structs are not allowed in C standard.
778 # Therefore add a dummy field if an empty message occurs.
779 result += ' uint8_t dummy_field;'
781 result += '\n'.join([str(f) for f in self.ordered_fields])
785 result += ' pb_packed'
787 result += ' %s;' % self.name
790 result = 'PB_PACKED_STRUCT_START\n' + result
791 result += '\nPB_PACKED_STRUCT_END'
796 return ''.join([f.types() for f in self.fields])
798 def get_initializer(self, null_init):
799 if not self.ordered_fields:
803 for field in self.ordered_fields:
804 parts.append(field.get_initializer(null_init))
805 return '{' + ', '.join(parts) + '}'
807 def default_decl(self, declaration_only = False):
809 for field in self.fields:
810 default = field.default_decl(declaration_only)
811 if default is not None:
812 result += default + '\n'
815 def count_required_fields(self):
816 '''Returns number of required fields inside this message'''
818 for f in self.fields:
819 if not isinstance(f, OneOf):
820 if f.rules == 'REQUIRED':
824 def count_all_fields(self):
826 for f in self.fields:
827 if isinstance(f, OneOf):
828 count += len(f.fields)
833 def fields_declaration(self):
834 result = 'extern const pb_field_t %s_fields[%d];' % (self.name, self.count_all_fields() + 1)
837 def fields_definition(self):
838 result = 'const pb_field_t %s_fields[%d] = {\n' % (self.name, self.count_all_fields() + 1)
841 for field in self.ordered_fields:
842 result += field.pb_field_t(prev)
844 if isinstance(field, OneOf):
845 prev = field.name + '.' + field.fields[-1].name
849 result += ' PB_LAST_FIELD\n};'
852 def encoded_size(self, dependencies):
853 '''Return the maximum size that this message can take when encoded.
854 If the size cannot be determined, returns None.
856 size = EncodedSize(0)
857 for field in self.fields:
858 fsize = field.encoded_size(dependencies)
866 # ---------------------------------------------------------------------------
867 # Processing of entire .proto files
868 # ---------------------------------------------------------------------------
870 def iterate_messages(desc, names = Names()):
871 '''Recursively find all messages. For each, yield name, DescriptorProto.'''
872 if hasattr(desc, 'message_type'):
873 submsgs = desc.message_type
875 submsgs = desc.nested_type
877 for submsg in submsgs:
878 sub_names = names + submsg.name
879 yield sub_names, submsg
881 for x in iterate_messages(submsg, sub_names):
884 def iterate_extensions(desc, names = Names()):
885 '''Recursively find all extensions.
886 For each, yield name, FieldDescriptorProto.
888 for extension in desc.extension:
889 yield names, extension
891 for subname, subdesc in iterate_messages(desc, names):
892 for extension in subdesc.extension:
893 yield subname, extension
897 From http://code.activestate.com/recipes/577413-topological-sort/
898 This function is under the MIT license.
900 for k, v in list(data.items()):
901 v.discard(k) # Ignore self dependencies
902 extra_items_in_deps = reduce(set.union, list(data.values()), set()) - set(data.keys())
903 data.update(dict([(item, set()) for item in extra_items_in_deps]))
905 ordered = set(item for item,dep in list(data.items()) if not dep)
908 for item in sorted(ordered):
910 data = dict([(item, (dep - ordered)) for item,dep in list(data.items())
911 if item not in ordered])
912 assert not data, "A cyclic dependency exists amongst %r" % data
914 def sort_dependencies(messages):
915 '''Sort a list of Messages based on dependencies.'''
918 for message in messages:
919 dependencies[str(message.name)] = set(message.get_dependencies())
920 message_by_name[str(message.name)] = message
922 for msgname in toposort2(dependencies):
923 if msgname in message_by_name:
924 yield message_by_name[msgname]
926 def make_identifier(headername):
927 '''Make #ifndef identifier that contains uppercase A-Z and digits 0-9'''
929 for c in headername.upper():
937 def __init__(self, fdesc, file_options):
938 '''Takes a FileDescriptorProto and parses it.'''
940 self.file_options = file_options
941 self.dependencies = {}
944 # Some of types used in this file probably come from the file itself.
945 # Thus it has implicit dependency on itself.
946 self.add_dependency(self)
953 if self.fdesc.package:
954 base_name = Names(self.fdesc.package.split('.'))
958 for enum in self.fdesc.enum_type:
959 enum_options = get_nanopb_suboptions(enum, self.file_options, base_name + enum.name)
960 self.enums.append(Enum(base_name, enum, enum_options))
962 for names, message in iterate_messages(self.fdesc, base_name):
963 message_options = get_nanopb_suboptions(message, self.file_options, names)
965 if message_options.skip_message:
968 self.messages.append(Message(names, message, message_options))
969 for enum in message.enum_type:
970 enum_options = get_nanopb_suboptions(enum, message_options, names + enum.name)
971 self.enums.append(Enum(names, enum, enum_options))
973 for names, extension in iterate_extensions(self.fdesc, base_name):
974 field_options = get_nanopb_suboptions(extension, self.file_options, names + extension.name)
975 if field_options.type != nanopb_pb2.FT_IGNORE:
976 self.extensions.append(ExtensionField(names, extension, field_options))
978 def add_dependency(self, other):
979 for enum in other.enums:
980 self.dependencies[str(enum.names)] = enum
982 for msg in other.messages:
983 self.dependencies[str(msg.name)] = msg
985 # Fix field default values where enum short names are used.
986 for enum in other.enums:
987 if not enum.options.long_names:
988 for message in self.messages:
989 for field in message.fields:
990 if field.default in enum.value_longnames:
991 idx = enum.value_longnames.index(field.default)
992 field.default = enum.values[idx][0]
994 # Fix field data types where enums have negative values.
995 for enum in other.enums:
996 if not enum.has_negative():
997 for message in self.messages:
998 for field in message.fields:
999 if field.pbtype == 'ENUM' and field.ctype == enum.names:
1000 field.pbtype = 'UENUM'
1002 def generate_header(self, includes, headername, options):
1003 '''Generate content for a header file.
1004 Generates strings, which should be concatenated and stored to file.
1007 yield '/* Automatically generated nanopb header */\n'
1008 if options.notimestamp:
1009 yield '/* Generated by %s */\n\n' % (nanopb_version)
1011 yield '/* Generated by %s at %s. */\n\n' % (nanopb_version, time.asctime())
1013 symbol = make_identifier(headername)
1014 yield '#ifndef PB_%s_INCLUDED\n' % symbol
1015 yield '#define PB_%s_INCLUDED\n' % symbol
1017 yield options.libformat % ('pb.h')
1019 # no %s specified - use whatever was passed in as options.libformat
1020 yield options.libformat
1023 for incfile in includes:
1024 noext = os.path.splitext(incfile)[0]
1025 yield options.genformat % (noext + options.extension + '.h')
1028 yield '#if PB_PROTO_HEADER_VERSION != 30\n'
1029 yield '#error Regenerate this file with the current version of nanopb generator.\n'
1033 yield '#ifdef __cplusplus\n'
1034 yield 'extern "C" {\n'
1038 yield '/* Enum definitions */\n'
1039 for enum in self.enums:
1040 yield str(enum) + '\n\n'
1043 yield '/* Struct definitions */\n'
1044 for msg in sort_dependencies(self.messages):
1046 yield str(msg) + '\n\n'
1049 yield '/* Extensions */\n'
1050 for extension in self.extensions:
1051 yield extension.extension_decl()
1055 yield '/* Default values for struct fields */\n'
1056 for msg in self.messages:
1057 yield msg.default_decl(True)
1060 yield '/* Initializer values for message structs */\n'
1061 for msg in self.messages:
1062 identifier = '%s_init_default' % msg.name
1063 yield '#define %-40s %s\n' % (identifier, msg.get_initializer(False))
1064 for msg in self.messages:
1065 identifier = '%s_init_zero' % msg.name
1066 yield '#define %-40s %s\n' % (identifier, msg.get_initializer(True))
1069 yield '/* Field tags (for use in manual encoding/decoding) */\n'
1070 for msg in sort_dependencies(self.messages):
1071 for field in msg.fields:
1073 for extension in self.extensions:
1074 yield extension.tags()
1077 yield '/* Struct field encoding specification for nanopb */\n'
1078 for msg in self.messages:
1079 yield msg.fields_declaration() + '\n'
1082 yield '/* Maximum encoded size of messages (where known) */\n'
1083 for msg in self.messages:
1084 msize = msg.encoded_size(self.dependencies)
1085 if msize is not None:
1086 identifier = '%s_size' % msg.name
1087 yield '#define %-40s %s\n' % (identifier, msize)
1090 yield '/* Message IDs (where set with "msgid" option) */\n'
1092 yield '#ifdef PB_MSGID\n'
1093 for msg in self.messages:
1094 if hasattr(msg,'msgid'):
1095 yield '#define PB_MSG_%d %s\n' % (msg.msgid, msg.name)
1098 symbol = make_identifier(headername.split('.')[0])
1099 yield '#define %s_MESSAGES \\\n' % symbol
1101 for msg in self.messages:
1103 msize = msg.encoded_size(self.dependencies)
1104 if msize is not None:
1106 if hasattr(msg,'msgid'):
1107 yield '\tPB_MSG(%d,%s,%s) \\\n' % (msg.msgid, m, msg.name)
1110 for msg in self.messages:
1111 if hasattr(msg,'msgid'):
1112 yield '#define %s_msgid %d\n' % (msg.name, msg.msgid)
1117 yield '#ifdef __cplusplus\n'
1118 yield '} /* extern "C" */\n'
1124 def generate_source(self, headername, options):
1125 '''Generate content for a source file.'''
1127 yield '/* Automatically generated nanopb constant definitions */\n'
1128 if options.notimestamp:
1129 yield '/* Generated by %s */\n\n' % (nanopb_version)
1131 yield '/* Generated by %s at %s. */\n\n' % (nanopb_version, time.asctime())
1132 yield options.genformat % (headername)
1135 yield '#if PB_PROTO_HEADER_VERSION != 30\n'
1136 yield '#error Regenerate this file with the current version of nanopb generator.\n'
1140 for msg in self.messages:
1141 yield msg.default_decl(False)
1145 for msg in self.messages:
1146 yield msg.fields_definition() + '\n\n'
1148 for ext in self.extensions:
1149 yield ext.extension_def() + '\n'
1151 # Add checks for numeric limits
1153 largest_msg = max(self.messages, key = lambda m: m.count_required_fields())
1154 largest_count = largest_msg.count_required_fields()
1155 if largest_count > 64:
1156 yield '\n/* Check that missing required fields will be properly detected */\n'
1157 yield '#if PB_MAX_REQUIRED_FIELDS < %d\n' % largest_count
1158 yield '#error Properly detecting missing required fields in %s requires \\\n' % largest_msg.name
1159 yield ' setting PB_MAX_REQUIRED_FIELDS to %d or more.\n' % largest_count
1162 max_field = FieldMaxSize()
1163 checks_msgnames = []
1164 for msg in self.messages:
1165 checks_msgnames.append(msg.name)
1166 for field in msg.fields:
1167 max_field.extend(field.largest_field_value())
1169 worst = max_field.worst
1170 worst_field = max_field.worst_field
1171 checks = max_field.checks
1173 if worst > 255 or checks:
1174 yield '\n/* Check that field information fits in pb_field_t */\n'
1176 if worst > 65535 or checks:
1177 yield '#if !defined(PB_FIELD_32BIT)\n'
1179 yield '#error Field descriptor for %s is too large. Define PB_FIELD_32BIT to fix this.\n' % worst_field
1181 assertion = ' && '.join(str(c) + ' < 65536' for c in checks)
1182 msgs = '_'.join(str(n) for n in checks_msgnames)
1183 yield '/* If you get an error here, it means that you need to define PB_FIELD_32BIT\n'
1184 yield ' * compile-time option. You can do that in pb.h or on compiler command line.\n'
1186 yield ' * The reason you need to do this is that some of your messages contain tag\n'
1187 yield ' * numbers or field sizes that are larger than what can fit in 8 or 16 bit\n'
1188 yield ' * field descriptors.\n'
1190 yield 'PB_STATIC_ASSERT((%s), YOU_MUST_DEFINE_PB_FIELD_32BIT_FOR_MESSAGES_%s)\n'%(assertion,msgs)
1194 yield '#if !defined(PB_FIELD_16BIT) && !defined(PB_FIELD_32BIT)\n'
1196 yield '#error Field descriptor for %s is too large. Define PB_FIELD_16BIT to fix this.\n' % worst_field
1198 assertion = ' && '.join(str(c) + ' < 256' for c in checks)
1199 msgs = '_'.join(str(n) for n in checks_msgnames)
1200 yield '/* If you get an error here, it means that you need to define PB_FIELD_16BIT\n'
1201 yield ' * compile-time option. You can do that in pb.h or on compiler command line.\n'
1203 yield ' * The reason you need to do this is that some of your messages contain tag\n'
1204 yield ' * numbers or field sizes that are larger than what can fit in the default\n'
1205 yield ' * 8 bit descriptors.\n'
1207 yield 'PB_STATIC_ASSERT((%s), YOU_MUST_DEFINE_PB_FIELD_16BIT_FOR_MESSAGES_%s)\n'%(assertion,msgs)
1210 # Add check for sizeof(double)
1212 for msg in self.messages:
1213 for field in msg.fields:
1214 if field.ctype == 'double':
1219 yield '/* On some platforms (such as AVR), double is really float.\n'
1220 yield ' * These are not directly supported by nanopb, but see example_avr_double.\n'
1221 yield ' * To get rid of this error, remove any double fields from your .proto.\n'
1223 yield 'PB_STATIC_ASSERT(sizeof(double) == 8, DOUBLE_MUST_BE_8_BYTES)\n'
1227 # ---------------------------------------------------------------------------
1228 # Options parsing for the .proto files
1229 # ---------------------------------------------------------------------------
1231 from fnmatch import fnmatch
1233 def read_options_file(infile):
1234 '''Parse a separate options file to list:
1235 [(namemask, options), ...]
1238 data = infile.read()
1239 data = re.sub('/\*.*?\*/', '', data, flags = re.MULTILINE)
1240 data = re.sub('//.*?$', '', data, flags = re.MULTILINE)
1241 data = re.sub('#.*?$', '', data, flags = re.MULTILINE)
1242 for i, line in enumerate(data.split('\n')):
1247 parts = line.split(None, 1)
1250 sys.stderr.write("%s:%d: " % (infile.name, i + 1) +
1251 "Option lines should have space between field name and options. " +
1252 "Skipping line: '%s'\n" % line)
1255 opts = nanopb_pb2.NanoPBOptions()
1258 text_format.Merge(parts[1], opts)
1259 except Exception as e:
1260 sys.stderr.write("%s:%d: " % (infile.name, i + 1) +
1261 "Unparseable option line: '%s'. " % line +
1262 "Error: %s\n" % str(e))
1264 results.append((parts[0], opts))
1269 '''Ugly global variables, should find a good way to pass these.'''
1270 verbose_options = False
1271 separate_options = []
1272 matched_namemasks = set()
1274 def get_nanopb_suboptions(subdesc, options, name):
1275 '''Get copy of options, and merge information from subdesc.'''
1276 new_options = nanopb_pb2.NanoPBOptions()
1277 new_options.CopyFrom(options)
1279 # Handle options defined in a separate file
1280 dotname = '.'.join(name.parts)
1281 for namemask, options in Globals.separate_options:
1282 if fnmatch(dotname, namemask):
1283 Globals.matched_namemasks.add(namemask)
1284 new_options.MergeFrom(options)
1286 # Handle options defined in .proto
1287 if isinstance(subdesc.options, descriptor.FieldOptions):
1288 ext_type = nanopb_pb2.nanopb
1289 elif isinstance(subdesc.options, descriptor.FileOptions):
1290 ext_type = nanopb_pb2.nanopb_fileopt
1291 elif isinstance(subdesc.options, descriptor.MessageOptions):
1292 ext_type = nanopb_pb2.nanopb_msgopt
1293 elif isinstance(subdesc.options, descriptor.EnumOptions):
1294 ext_type = nanopb_pb2.nanopb_enumopt
1296 raise Exception("Unknown options type")
1298 if subdesc.options.HasExtension(ext_type):
1299 ext = subdesc.options.Extensions[ext_type]
1300 new_options.MergeFrom(ext)
1302 if Globals.verbose_options:
1303 sys.stderr.write("Options for " + dotname + ": ")
1304 sys.stderr.write(text_format.MessageToString(new_options) + "\n")
1309 # ---------------------------------------------------------------------------
1310 # Command line interface
1311 # ---------------------------------------------------------------------------
1315 from optparse import OptionParser
1317 optparser = OptionParser(
1318 usage = "Usage: nanopb_generator.py [options] file.pb ...",
1319 epilog = "Compile file.pb from file.proto by: 'protoc -ofile.pb file.proto'. " +
1320 "Output will be written to file.pb.h and file.pb.c.")
1321 optparser.add_option("-x", dest="exclude", metavar="FILE", action="append", default=[],
1322 help="Exclude file from generated #include list.")
1323 optparser.add_option("-e", "--extension", dest="extension", metavar="EXTENSION", default=".pb",
1324 help="Set extension to use instead of '.pb' for generated files. [default: %default]")
1325 optparser.add_option("-f", "--options-file", dest="options_file", metavar="FILE", default="%s.options",
1326 help="Set name of a separate generator options file.")
1327 optparser.add_option("-I", "--options-path", dest="options_path", metavar="DIR",
1328 action="append", default = [],
1329 help="Search for .options files additionally in this path")
1330 optparser.add_option("-Q", "--generated-include-format", dest="genformat",
1331 metavar="FORMAT", default='#include "%s"\n',
1332 help="Set format string to use for including other .pb.h files. [default: %default]")
1333 optparser.add_option("-L", "--library-include-format", dest="libformat",
1334 metavar="FORMAT", default='#include <%s>\n',
1335 help="Set format string to use for including the nanopb pb.h header. [default: %default]")
1336 optparser.add_option("-T", "--no-timestamp", dest="notimestamp", action="store_true", default=False,
1337 help="Don't add timestamp to .pb.h and .pb.c preambles")
1338 optparser.add_option("-q", "--quiet", dest="quiet", action="store_true", default=False,
1339 help="Don't print anything except errors.")
1340 optparser.add_option("-v", "--verbose", dest="verbose", action="store_true", default=False,
1341 help="Print more information.")
1342 optparser.add_option("-s", dest="settings", metavar="OPTION:VALUE", action="append", default=[],
1343 help="Set generator option (max_size, max_count etc.).")
1345 def parse_file(filename, fdesc, options):
1346 '''Parse a single file. Returns a ProtoFile instance.'''
1347 toplevel_options = nanopb_pb2.NanoPBOptions()
1348 for s in options.settings:
1349 text_format.Merge(s, toplevel_options)
1352 data = open(filename, 'rb').read()
1353 fdesc = descriptor.FileDescriptorSet.FromString(data).file[0]
1355 # Check if there is a separate .options file
1358 optfilename = options.options_file % os.path.splitext(filename)[0]
1360 # No %s specified, use the filename as-is
1361 optfilename = options.options_file
1364 paths = ['.'] + options.options_path
1366 if os.path.isfile(os.path.join(p, optfilename)):
1367 optfilename = os.path.join(p, optfilename)
1369 sys.stderr.write('Reading options from ' + optfilename + '\n')
1370 Globals.separate_options = read_options_file(open(optfilename, "rU"))
1373 # If we are given a full filename and it does not exist, give an error.
1374 # However, don't give error when we automatically look for .options file
1375 # with the same name as .proto.
1376 if options.verbose or had_abspath:
1377 sys.stderr.write('Options file not found: ' + optfilename + '\n')
1378 Globals.separate_options = []
1380 Globals.matched_namemasks = set()
1383 file_options = get_nanopb_suboptions(fdesc, toplevel_options, Names([filename]))
1384 f = ProtoFile(fdesc, file_options)
1385 f.optfilename = optfilename
1389 def process_file(filename, fdesc, options, other_files = {}):
1390 '''Process a single file.
1391 filename: The full path to the .proto or .pb source file, as string.
1392 fdesc: The loaded FileDescriptorSet, or None to read from the input file.
1393 options: Command line options as they come from OptionsParser.
1396 {'headername': Name of header file,
1397 'headerdata': Data for the .h header file,
1398 'sourcename': Name of the source code file,
1399 'sourcedata': Data for the .c source code file
1402 f = parse_file(filename, fdesc, options)
1404 # Provide dependencies if available
1405 for dep in f.fdesc.dependency:
1406 if dep in other_files:
1407 f.add_dependency(other_files[dep])
1409 # Decide the file names
1410 noext = os.path.splitext(filename)[0]
1411 headername = noext + options.extension + '.h'
1412 sourcename = noext + options.extension + '.c'
1413 headerbasename = os.path.basename(headername)
1415 # List of .proto files that should not be included in the C header file
1416 # even if they are mentioned in the source .proto.
1417 excludes = ['nanopb.proto', 'google/protobuf/descriptor.proto'] + options.exclude
1418 includes = [d for d in f.fdesc.dependency if d not in excludes]
1420 headerdata = ''.join(f.generate_header(includes, headerbasename, options))
1421 sourcedata = ''.join(f.generate_source(headerbasename, options))
1423 # Check if there were any lines in .options that did not match a member
1424 unmatched = [n for n,o in Globals.separate_options if n not in Globals.matched_namemasks]
1425 if unmatched and not options.quiet:
1426 sys.stderr.write("Following patterns in " + f.optfilename + " did not match any fields: "
1427 + ', '.join(unmatched) + "\n")
1428 if not Globals.verbose_options:
1429 sys.stderr.write("Use protoc --nanopb-out=-v:. to see a list of the field names.\n")
1431 return {'headername': headername, 'headerdata': headerdata,
1432 'sourcename': sourcename, 'sourcedata': sourcedata}
1435 '''Main function when invoked directly from the command line.'''
1437 options, filenames = optparser.parse_args()
1440 optparser.print_help()
1444 options.verbose = False
1446 Globals.verbose_options = options.verbose
1448 for filename in filenames:
1449 results = process_file(filename, None, options)
1451 if not options.quiet:
1452 sys.stderr.write("Writing to " + results['headername'] + " and "
1453 + results['sourcename'] + "\n")
1455 open(results['headername'], 'w').write(results['headerdata'])
1456 open(results['sourcename'], 'w').write(results['sourcedata'])
1459 '''Main function when invoked as a protoc plugin.'''
1462 if sys.platform == "win32":
1464 # Set stdin and stdout to binary mode
1465 msvcrt.setmode(sys.stdin.fileno(), os.O_BINARY)
1466 msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
1468 data = io.open(sys.stdin.fileno(), "rb").read()
1470 request = plugin_pb2.CodeGeneratorRequest.FromString(data)
1473 # Versions of Python prior to 2.7.3 do not support unicode
1474 # input to shlex.split(). Try to convert to str if possible.
1475 params = str(request.parameter)
1476 except UnicodeEncodeError:
1477 params = request.parameter
1480 args = shlex.split(params)
1481 options, dummy = optparser.parse_args(args)
1483 Globals.verbose_options = options.verbose
1485 response = plugin_pb2.CodeGeneratorResponse()
1487 # Google's protoc does not currently indicate the full path of proto files.
1488 # Instead always add the main file path to the search dirs, that works for
1491 options.options_path.append(os.path.dirname(request.file_to_generate[0]))
1493 # Process any include files first, in order to have them
1494 # available as dependencies
1496 for fdesc in request.proto_file:
1497 other_files[fdesc.name] = parse_file(fdesc.name, fdesc, options)
1499 for filename in request.file_to_generate:
1500 for fdesc in request.proto_file:
1501 if fdesc.name == filename:
1502 results = process_file(filename, fdesc, options, other_files)
1504 f = response.file.add()
1505 f.name = results['headername']
1506 f.content = results['headerdata']
1508 f = response.file.add()
1509 f.name = results['sourcename']
1510 f.content = results['sourcedata']
1512 io.open(sys.stdout.fileno(), "wb").write(response.SerializeToString())
1514 if __name__ == '__main__':
1515 # Check if we are running as a plugin under protoc
1516 if 'protoc-gen-' in sys.argv[0] or '--protoc-plugin' in sys.argv: