3 from __future__ import unicode_literals
5 '''Generate header file for nanopb from a ProtoBuf FileDescriptorSet.'''
6 nanopb_version = "nanopb-0.3.5-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',
77 # String types (for python 2 / python 3 compatibility)
79 strtypes = (unicode, str)
84 '''Keeps a set of nested names and formats them to C identifier.'''
85 def __init__(self, parts = ()):
86 if isinstance(parts, Names):
88 self.parts = tuple(parts)
91 return '_'.join(self.parts)
93 def __add__(self, other):
94 if isinstance(other, strtypes):
95 return Names(self.parts + (other,))
96 elif isinstance(other, tuple):
97 return Names(self.parts + other)
99 raise ValueError("Name parts should be of type str")
101 def __eq__(self, other):
102 return isinstance(other, Names) and self.parts == other.parts
104 def names_from_type_name(type_name):
105 '''Parse Names() from FieldDescriptorProto type_name'''
106 if type_name[0] != '.':
107 raise NotImplementedError("Lookup of non-absolute type names is not supported")
108 return Names(type_name[1:].split('.'))
110 def varint_max_size(max_value):
111 '''Returns the maximum number of bytes a varint can take when encoded.'''
113 max_value = 2**64 - max_value
114 for i in range(1, 11):
115 if (max_value >> (i * 7)) == 0:
117 raise ValueError("Value too large for varint: " + str(max_value))
119 assert varint_max_size(-1) == 10
120 assert varint_max_size(0) == 1
121 assert varint_max_size(127) == 1
122 assert varint_max_size(128) == 2
125 '''Class used to represent the encoded size of a field or a message.
126 Consists of a combination of symbolic sizes and integer sizes.'''
127 def __init__(self, value = 0, symbols = []):
128 if isinstance(value, strtypes + (Names,)):
129 symbols = [str(value)]
132 self.symbols = symbols
134 def __add__(self, other):
135 if isinstance(other, int):
136 return EncodedSize(self.value + other, self.symbols)
137 elif isinstance(other, strtypes + (Names,)):
138 return EncodedSize(self.value, self.symbols + [str(other)])
139 elif isinstance(other, EncodedSize):
140 return EncodedSize(self.value + other.value, self.symbols + other.symbols)
142 raise ValueError("Cannot add size: " + repr(other))
144 def __mul__(self, other):
145 if isinstance(other, int):
146 return EncodedSize(self.value * other, [str(other) + '*' + s for s in self.symbols])
148 raise ValueError("Cannot multiply size: " + repr(other))
152 return str(self.value)
154 return '(' + str(self.value) + ' + ' + ' + '.join(self.symbols) + ')'
156 def upperlimit(self):
163 def __init__(self, names, desc, enum_options):
164 '''desc is EnumDescriptorProto'''
166 self.options = enum_options
167 self.names = names + desc.name
169 if enum_options.long_names:
170 self.values = [(self.names + x.name, x.number) for x in desc.value]
172 self.values = [(names + x.name, x.number) for x in desc.value]
174 self.value_longnames = [self.names + x.name for x in desc.value]
175 self.packed = enum_options.packed_enum
177 def has_negative(self):
178 for n, v in self.values:
183 def encoded_size(self):
184 return max([varint_max_size(v) for n,v in self.values])
187 result = 'typedef enum _%s {\n' % self.names
188 result += ',\n'.join([" %s = %d" % x for x in self.values])
192 result += ' pb_packed'
194 result += ' %s;' % self.names
196 if not self.options.long_names:
197 # Define the long names always so that enum value references
198 # from other files work properly.
199 for i, x in enumerate(self.values):
200 result += '\n#define %s %s' % (self.value_longnames[i], x[0])
205 def __init__(self, worst = 0, checks = [], field_name = 'undefined'):
206 if isinstance(worst, list):
207 self.worst = max(i for i in worst if i is not None)
211 self.worst_field = field_name
214 def extend(self, extend, field_name = None):
215 self.worst = max(self.worst, extend.worst)
217 if self.worst == extend.worst:
218 self.worst_field = extend.worst_field
220 self.checks.extend(extend.checks)
223 def __init__(self, struct_name, desc, field_options):
224 '''desc is FieldDescriptorProto'''
225 self.tag = desc.number
226 self.struct_name = struct_name
227 self.union_name = None
228 self.name = desc.name
231 self.max_count = None
236 # Parse field options
237 if field_options.HasField("max_size"):
238 self.max_size = field_options.max_size
240 if field_options.HasField("max_count"):
241 self.max_count = field_options.max_count
243 if desc.HasField('default_value'):
244 self.default = desc.default_value
246 # Check field rules, i.e. required/optional/repeated.
248 if desc.label == FieldD.LABEL_REQUIRED:
249 self.rules = 'REQUIRED'
250 elif desc.label == FieldD.LABEL_OPTIONAL:
251 self.rules = 'OPTIONAL'
252 elif desc.label == FieldD.LABEL_REPEATED:
253 self.rules = 'REPEATED'
254 if self.max_count is None:
255 can_be_static = False
257 self.array_decl = '[%d]' % self.max_count
259 raise NotImplementedError(desc.label)
261 # Check if the field can be implemented with static allocation
262 # i.e. whether the data size is known.
263 if desc.type == FieldD.TYPE_STRING and self.max_size is None:
264 can_be_static = False
266 if desc.type == FieldD.TYPE_BYTES and self.max_size is None:
267 can_be_static = False
269 # Decide how the field data will be allocated
270 if field_options.type == nanopb_pb2.FT_DEFAULT:
272 field_options.type = nanopb_pb2.FT_STATIC
274 field_options.type = nanopb_pb2.FT_CALLBACK
276 if field_options.type == nanopb_pb2.FT_STATIC and not can_be_static:
277 raise Exception("Field %s is defined as static, but max_size or "
278 "max_count is not given." % self.name)
280 if field_options.type == nanopb_pb2.FT_STATIC:
281 self.allocation = 'STATIC'
282 elif field_options.type == nanopb_pb2.FT_POINTER:
283 self.allocation = 'POINTER'
284 elif field_options.type == nanopb_pb2.FT_CALLBACK:
285 self.allocation = 'CALLBACK'
287 raise NotImplementedError(field_options.type)
289 # Decide the C data type to use in the struct.
290 if desc.type in datatypes:
291 self.ctype, self.pbtype, self.enc_size, isa = datatypes[desc.type]
293 # Override the field size if user wants to use smaller integers
294 if isa and field_options.int_size != nanopb_pb2.IS_DEFAULT:
295 self.ctype = intsizes[field_options.int_size]
296 if desc.type == FieldD.TYPE_UINT32 or desc.type == FieldD.TYPE_UINT64:
297 self.ctype = 'u' + self.ctype;
298 elif desc.type == FieldD.TYPE_ENUM:
300 self.ctype = names_from_type_name(desc.type_name)
301 if self.default is not None:
302 self.default = self.ctype + self.default
303 self.enc_size = None # Needs to be filled in when enum values are known
304 elif desc.type == FieldD.TYPE_STRING:
305 self.pbtype = 'STRING'
307 if self.allocation == 'STATIC':
309 self.array_decl += '[%d]' % self.max_size
310 self.enc_size = varint_max_size(self.max_size) + self.max_size
311 elif desc.type == FieldD.TYPE_BYTES:
312 self.pbtype = 'BYTES'
313 if self.allocation == 'STATIC':
314 self.ctype = self.struct_name + self.name + 't'
315 self.enc_size = varint_max_size(self.max_size) + self.max_size
316 elif self.allocation == 'POINTER':
317 self.ctype = 'pb_bytes_array_t'
318 elif desc.type == FieldD.TYPE_MESSAGE:
319 self.pbtype = 'MESSAGE'
320 self.ctype = self.submsgname = names_from_type_name(desc.type_name)
321 self.enc_size = None # Needs to be filled in after the message type is available
323 raise NotImplementedError(desc.type)
325 def __lt__(self, other):
326 return self.tag < other.tag
330 if self.allocation == 'POINTER':
331 if self.rules == 'REPEATED':
332 result += ' pb_size_t ' + self.name + '_count;\n'
334 if self.pbtype == 'MESSAGE':
335 # Use struct definition, so recursive submessages are possible
336 result += ' struct _%s *%s;' % (self.ctype, self.name)
337 elif self.rules == 'REPEATED' and self.pbtype in ['STRING', 'BYTES']:
338 # String/bytes arrays need to be defined as pointers to pointers
339 result += ' %s **%s;' % (self.ctype, self.name)
341 result += ' %s *%s;' % (self.ctype, self.name)
342 elif self.allocation == 'CALLBACK':
343 result += ' pb_callback_t %s;' % self.name
345 if self.rules == 'OPTIONAL' and self.allocation == 'STATIC':
346 result += ' bool has_' + self.name + ';\n'
347 elif self.rules == 'REPEATED' and self.allocation == 'STATIC':
348 result += ' pb_size_t ' + self.name + '_count;\n'
349 result += ' %s %s%s;' % (self.ctype, self.name, self.array_decl)
353 '''Return definitions for any special types this field might need.'''
354 if self.pbtype == 'BYTES' and self.allocation == 'STATIC':
355 result = 'typedef PB_BYTES_ARRAY_T(%d) %s;\n' % (self.max_size, self.ctype)
360 def get_dependencies(self):
361 '''Get list of type names used by this field.'''
362 if self.allocation == 'STATIC':
363 return [str(self.ctype)]
367 def get_initializer(self, null_init, inner_init_only = False):
368 '''Return literal expression for this field's default value.
369 null_init: If True, initialize to a 0 value instead of default from .proto
370 inner_init_only: If True, exclude initialization for any count/has fields
374 if self.pbtype == 'MESSAGE':
376 inner_init = '%s_init_zero' % self.ctype
378 inner_init = '%s_init_default' % self.ctype
379 elif self.default is None or null_init:
380 if self.pbtype == 'STRING':
382 elif self.pbtype == 'BYTES':
383 inner_init = '{0, {0}}'
384 elif self.pbtype in ('ENUM', 'UENUM'):
385 inner_init = '(%s)0' % self.ctype
389 if self.pbtype == 'STRING':
390 inner_init = self.default.replace('"', '\\"')
391 inner_init = '"' + inner_init + '"'
392 elif self.pbtype == 'BYTES':
393 data = ['0x%02x' % ord(c) for c in self.default]
395 inner_init = '{0, {0}}'
397 inner_init = '{%d, {%s}}' % (len(data), ','.join(data))
398 elif self.pbtype in ['FIXED32', 'UINT32']:
399 inner_init = str(self.default) + 'u'
400 elif self.pbtype in ['FIXED64', 'UINT64']:
401 inner_init = str(self.default) + 'ull'
402 elif self.pbtype in ['SFIXED64', 'INT64']:
403 inner_init = str(self.default) + 'll'
405 inner_init = str(self.default)
411 if self.allocation == 'STATIC':
412 if self.rules == 'REPEATED':
414 outer_init += ', '.join([inner_init] * self.max_count)
416 elif self.rules == 'OPTIONAL':
417 outer_init = 'false, ' + inner_init
419 outer_init = inner_init
420 elif self.allocation == 'POINTER':
421 if self.rules == 'REPEATED':
422 outer_init = '0, NULL'
425 elif self.allocation == 'CALLBACK':
426 if self.pbtype == 'EXTENSION':
429 outer_init = '{{NULL}, NULL}'
433 def default_decl(self, declaration_only = False):
434 '''Return definition for this field's default value.'''
435 if self.default is None:
439 default = self.get_initializer(False, True)
442 if self.pbtype == 'STRING':
443 if self.allocation != 'STATIC':
444 return None # Not implemented
445 array_decl = '[%d]' % self.max_size
446 elif self.pbtype == 'BYTES':
447 if self.allocation != 'STATIC':
448 return None # Not implemented
451 return 'extern const %s %s_default%s;' % (ctype, self.struct_name + self.name, array_decl)
453 return 'const %s %s_default%s = %s;' % (ctype, self.struct_name + self.name, array_decl, default)
456 '''Return the #define for the tag number of this field.'''
457 identifier = '%s_%s_tag' % (self.struct_name, self.name)
458 return '#define %-40s %d\n' % (identifier, self.tag)
460 def pb_field_t(self, prev_field_name):
461 '''Return the pb_field_t initializer to use in the constant array.
462 prev_field_name is the name of the previous field or None.
465 if self.rules == 'ONEOF':
467 result = ' PB_ANONYMOUS_ONEOF_FIELD(%s, ' % self.union_name
469 result = ' PB_ONEOF_FIELD(%s, ' % self.union_name
471 result = ' PB_FIELD('
473 result += '%3d, ' % self.tag
474 result += '%-8s, ' % self.pbtype
475 result += '%s, ' % self.rules
476 result += '%-8s, ' % self.allocation
477 result += '%s, ' % ("FIRST" if not prev_field_name else "OTHER")
478 result += '%s, ' % self.struct_name
479 result += '%s, ' % self.name
480 result += '%s, ' % (prev_field_name or self.name)
482 if self.pbtype == 'MESSAGE':
483 result += '&%s_fields)' % self.submsgname
484 elif self.default is None:
486 elif self.pbtype in ['BYTES', 'STRING'] and self.allocation != 'STATIC':
487 result += '0)' # Arbitrary size default values not implemented
488 elif self.rules == 'OPTEXT':
489 result += '0)' # Default value for extensions is not implemented
491 result += '&%s_default)' % (self.struct_name + self.name)
495 def get_last_field_name(self):
498 def largest_field_value(self):
499 '''Determine if this field needs 16bit or 32bit pb_field_t structure to compile properly.
500 Returns numeric value or a C-expression for assert.'''
502 if self.pbtype == 'MESSAGE':
503 if self.rules == 'REPEATED' and self.allocation == 'STATIC':
504 check.append('pb_membersize(%s, %s[0])' % (self.struct_name, self.name))
505 elif self.rules == 'ONEOF':
507 check.append('pb_membersize(%s, %s)' % (self.struct_name, self.name))
509 check.append('pb_membersize(%s, %s.%s)' % (self.struct_name, self.union_name, self.name))
511 check.append('pb_membersize(%s, %s)' % (self.struct_name, self.name))
513 return FieldMaxSize([self.tag, self.max_size, self.max_count],
515 ('%s.%s' % (self.struct_name, self.name)))
517 def encoded_size(self, dependencies):
518 '''Return the maximum size that this field can take when encoded,
519 including the field tag. If the size cannot be determined, returns
522 if self.allocation != 'STATIC':
525 if self.pbtype == 'MESSAGE':
527 if str(self.submsgname) in dependencies:
528 submsg = dependencies[str(self.submsgname)]
529 encsize = submsg.encoded_size(dependencies)
530 if encsize is not None:
531 # Include submessage length prefix
532 encsize += varint_max_size(encsize.upperlimit())
535 # Submessage or its size cannot be found.
536 # This can occur if submessage is defined in different
537 # file, and it or its .options could not be found.
538 # Instead of direct numeric value, reference the size that
539 # has been #defined in the other file.
540 encsize = EncodedSize(self.submsgname + 'size')
542 # We will have to make a conservative assumption on the length
543 # prefix size, though.
546 elif self.pbtype in ['ENUM', 'UENUM']:
547 if str(self.ctype) in dependencies:
548 enumtype = dependencies[str(self.ctype)]
549 encsize = enumtype.encoded_size()
551 # Conservative assumption
554 elif self.enc_size is None:
555 raise RuntimeError("Could not determine encoded size for %s.%s"
556 % (self.struct_name, self.name))
558 encsize = EncodedSize(self.enc_size)
560 encsize += varint_max_size(self.tag << 3) # Tag + wire type
562 if self.rules == 'REPEATED':
563 # Decoders must be always able to handle unpacked arrays.
564 # Therefore we have to reserve space for it, even though
565 # we emit packed arrays ourselves.
566 encsize *= self.max_count
571 class ExtensionRange(Field):
572 def __init__(self, struct_name, range_start, field_options):
573 '''Implements a special pb_extension_t* field in an extensible message
574 structure. The range_start signifies the index at which the extensions
575 start. Not necessarily all tags above this are extensions, it is merely
576 a speed optimization.
578 self.tag = range_start
579 self.struct_name = struct_name
580 self.name = 'extensions'
581 self.pbtype = 'EXTENSION'
582 self.rules = 'OPTIONAL'
583 self.allocation = 'CALLBACK'
584 self.ctype = 'pb_extension_t'
591 return ' pb_extension_t *extensions;'
599 def encoded_size(self, dependencies):
600 # We exclude extensions from the count, because they cannot be known
601 # until runtime. Other option would be to return None here, but this
602 # way the value remains useful if extensions are not used.
603 return EncodedSize(0)
605 class ExtensionField(Field):
606 def __init__(self, struct_name, desc, field_options):
607 self.fullname = struct_name + desc.name
608 self.extendee_name = names_from_type_name(desc.extendee)
609 Field.__init__(self, self.fullname + 'struct', desc, field_options)
611 if self.rules != 'OPTIONAL':
615 self.rules = 'OPTEXT'
618 '''Return the #define for the tag number of this field.'''
619 identifier = '%s_tag' % self.fullname
620 return '#define %-40s %d\n' % (identifier, self.tag)
622 def extension_decl(self):
623 '''Declaration of the extension type in the .pb.h file'''
625 msg = '/* Extension field %s was skipped because only "optional"\n' % self.fullname
626 msg +=' type of extension fields is currently supported. */\n'
629 return ('extern const pb_extension_type_t %s; /* field type: %s */\n' %
630 (self.fullname, str(self).strip()))
632 def extension_def(self):
633 '''Definition of the extension type in the .pb.c file'''
638 result = 'typedef struct {\n'
640 result += '\n} %s;\n\n' % self.struct_name
641 result += ('static const pb_field_t %s_field = \n %s;\n\n' %
642 (self.fullname, self.pb_field_t(None)))
643 result += 'const pb_extension_type_t %s = {\n' % self.fullname
646 result += ' &%s_field\n' % self.fullname
651 # ---------------------------------------------------------------------------
652 # Generation of oneofs (unions)
653 # ---------------------------------------------------------------------------
656 def __init__(self, struct_name, oneof_desc):
657 self.struct_name = struct_name
658 self.name = oneof_desc.name
660 self.pbtype = 'oneof'
662 self.allocation = 'ONEOF'
665 self.anonymous = False
667 def add_field(self, field):
668 if field.allocation == 'CALLBACK':
669 raise Exception("Callback fields inside of oneof are not supported"
670 + " (field %s)" % field.name)
672 field.union_name = self.name
673 field.rules = 'ONEOF'
674 field.anonymous = self.anonymous
675 self.fields.append(field)
676 self.fields.sort(key = lambda f: f.tag)
678 # Sort by the lowest tag number inside union
679 self.tag = min([f.tag for f in self.fields])
684 result += ' pb_size_t which_' + self.name + ";\n"
685 result += ' union {\n'
686 for f in self.fields:
687 result += ' ' + str(f).replace('\n', '\n ') + '\n'
691 result += ' } ' + self.name + ';'
695 return ''.join([f.types() for f in self.fields])
697 def get_dependencies(self):
699 for f in self.fields:
700 deps += f.get_dependencies()
703 def get_initializer(self, null_init):
704 return '0, {' + self.fields[0].get_initializer(null_init) + '}'
706 def default_decl(self, declaration_only = False):
710 return ''.join([f.tags() for f in self.fields])
712 def pb_field_t(self, prev_field_name):
713 result = ',\n'.join([f.pb_field_t(prev_field_name) for f in self.fields])
716 def get_last_field_name(self):
718 return self.fields[-1].name
720 return self.name + '.' + self.fields[-1].name
722 def largest_field_value(self):
723 largest = FieldMaxSize()
724 for f in self.fields:
725 largest.extend(f.largest_field_value())
728 def encoded_size(self, dependencies):
729 largest = EncodedSize(0)
730 for f in self.fields:
731 size = f.encoded_size(dependencies)
735 return None # Cannot resolve maximum of symbols
736 elif size.value > largest.value:
741 # ---------------------------------------------------------------------------
742 # Generation of messages (structures)
743 # ---------------------------------------------------------------------------
747 def __init__(self, names, desc, message_options):
753 if message_options.msgid:
754 self.msgid = message_options.msgid
756 if hasattr(desc, 'oneof_decl'):
757 for i, f in enumerate(desc.oneof_decl):
758 oneof_options = get_nanopb_suboptions(desc, message_options, self.name + f.name)
759 if oneof_options.no_unions:
760 no_unions.append(i) # No union, but add fields normally
761 elif oneof_options.type == nanopb_pb2.FT_IGNORE:
762 pass # No union and skip fields also
764 oneof = OneOf(self.name, f)
765 if oneof_options.anonymous_oneof:
766 oneof.anonymous = True
767 self.oneofs[i] = oneof
768 self.fields.append(oneof)
771 field_options = get_nanopb_suboptions(f, message_options, self.name + f.name)
772 if field_options.type == nanopb_pb2.FT_IGNORE:
775 field = Field(self.name, f, field_options)
776 if (hasattr(f, 'oneof_index') and
777 f.HasField('oneof_index') and
778 f.oneof_index not in no_unions):
779 if f.oneof_index in self.oneofs:
780 self.oneofs[f.oneof_index].add_field(field)
782 self.fields.append(field)
784 if len(desc.extension_range) > 0:
785 field_options = get_nanopb_suboptions(desc, message_options, self.name + 'extensions')
786 range_start = min([r.start for r in desc.extension_range])
787 if field_options.type != nanopb_pb2.FT_IGNORE:
788 self.fields.append(ExtensionRange(self.name, range_start, field_options))
790 self.packed = message_options.packed_struct
791 self.ordered_fields = self.fields[:]
792 self.ordered_fields.sort()
794 def get_dependencies(self):
795 '''Get list of type names that this structure refers to.'''
797 for f in self.fields:
798 deps += f.get_dependencies()
802 result = 'typedef struct _%s {\n' % self.name
804 if not self.ordered_fields:
805 # Empty structs are not allowed in C standard.
806 # Therefore add a dummy field if an empty message occurs.
807 result += ' uint8_t dummy_field;'
809 result += '\n'.join([str(f) for f in self.ordered_fields])
813 result += ' pb_packed'
815 result += ' %s;' % self.name
818 result = 'PB_PACKED_STRUCT_START\n' + result
819 result += '\nPB_PACKED_STRUCT_END'
824 return ''.join([f.types() for f in self.fields])
826 def get_initializer(self, null_init):
827 if not self.ordered_fields:
831 for field in self.ordered_fields:
832 parts.append(field.get_initializer(null_init))
833 return '{' + ', '.join(parts) + '}'
835 def default_decl(self, declaration_only = False):
837 for field in self.fields:
838 default = field.default_decl(declaration_only)
839 if default is not None:
840 result += default + '\n'
843 def count_required_fields(self):
844 '''Returns number of required fields inside this message'''
846 for f in self.fields:
847 if not isinstance(f, OneOf):
848 if f.rules == 'REQUIRED':
852 def count_all_fields(self):
854 for f in self.fields:
855 if isinstance(f, OneOf):
856 count += len(f.fields)
861 def fields_declaration(self):
862 result = 'extern const pb_field_t %s_fields[%d];' % (self.name, self.count_all_fields() + 1)
865 def fields_definition(self):
866 result = 'const pb_field_t %s_fields[%d] = {\n' % (self.name, self.count_all_fields() + 1)
869 for field in self.ordered_fields:
870 result += field.pb_field_t(prev)
872 prev = field.get_last_field_name()
874 result += ' PB_LAST_FIELD\n};'
877 def encoded_size(self, dependencies):
878 '''Return the maximum size that this message can take when encoded.
879 If the size cannot be determined, returns None.
881 size = EncodedSize(0)
882 for field in self.fields:
883 fsize = field.encoded_size(dependencies)
891 # ---------------------------------------------------------------------------
892 # Processing of entire .proto files
893 # ---------------------------------------------------------------------------
895 def iterate_messages(desc, names = Names()):
896 '''Recursively find all messages. For each, yield name, DescriptorProto.'''
897 if hasattr(desc, 'message_type'):
898 submsgs = desc.message_type
900 submsgs = desc.nested_type
902 for submsg in submsgs:
903 sub_names = names + submsg.name
904 yield sub_names, submsg
906 for x in iterate_messages(submsg, sub_names):
909 def iterate_extensions(desc, names = Names()):
910 '''Recursively find all extensions.
911 For each, yield name, FieldDescriptorProto.
913 for extension in desc.extension:
914 yield names, extension
916 for subname, subdesc in iterate_messages(desc, names):
917 for extension in subdesc.extension:
918 yield subname, extension
922 From http://code.activestate.com/recipes/577413-topological-sort/
923 This function is under the MIT license.
925 for k, v in list(data.items()):
926 v.discard(k) # Ignore self dependencies
927 extra_items_in_deps = reduce(set.union, list(data.values()), set()) - set(data.keys())
928 data.update(dict([(item, set()) for item in extra_items_in_deps]))
930 ordered = set(item for item,dep in list(data.items()) if not dep)
933 for item in sorted(ordered):
935 data = dict([(item, (dep - ordered)) for item,dep in list(data.items())
936 if item not in ordered])
937 assert not data, "A cyclic dependency exists amongst %r" % data
939 def sort_dependencies(messages):
940 '''Sort a list of Messages based on dependencies.'''
943 for message in messages:
944 dependencies[str(message.name)] = set(message.get_dependencies())
945 message_by_name[str(message.name)] = message
947 for msgname in toposort2(dependencies):
948 if msgname in message_by_name:
949 yield message_by_name[msgname]
951 def make_identifier(headername):
952 '''Make #ifndef identifier that contains uppercase A-Z and digits 0-9'''
954 for c in headername.upper():
962 def __init__(self, fdesc, file_options):
963 '''Takes a FileDescriptorProto and parses it.'''
965 self.file_options = file_options
966 self.dependencies = {}
969 # Some of types used in this file probably come from the file itself.
970 # Thus it has implicit dependency on itself.
971 self.add_dependency(self)
978 if self.fdesc.package:
979 base_name = Names(self.fdesc.package.split('.'))
983 for enum in self.fdesc.enum_type:
984 enum_options = get_nanopb_suboptions(enum, self.file_options, base_name + enum.name)
985 self.enums.append(Enum(base_name, enum, enum_options))
987 for names, message in iterate_messages(self.fdesc, base_name):
988 message_options = get_nanopb_suboptions(message, self.file_options, names)
990 if message_options.skip_message:
993 self.messages.append(Message(names, message, message_options))
994 for enum in message.enum_type:
995 enum_options = get_nanopb_suboptions(enum, message_options, names + enum.name)
996 self.enums.append(Enum(names, enum, enum_options))
998 for names, extension in iterate_extensions(self.fdesc, base_name):
999 field_options = get_nanopb_suboptions(extension, self.file_options, names + extension.name)
1000 if field_options.type != nanopb_pb2.FT_IGNORE:
1001 self.extensions.append(ExtensionField(names, extension, field_options))
1003 def add_dependency(self, other):
1004 for enum in other.enums:
1005 self.dependencies[str(enum.names)] = enum
1007 for msg in other.messages:
1008 self.dependencies[str(msg.name)] = msg
1010 # Fix field default values where enum short names are used.
1011 for enum in other.enums:
1012 if not enum.options.long_names:
1013 for message in self.messages:
1014 for field in message.fields:
1015 if field.default in enum.value_longnames:
1016 idx = enum.value_longnames.index(field.default)
1017 field.default = enum.values[idx][0]
1019 # Fix field data types where enums have negative values.
1020 for enum in other.enums:
1021 if not enum.has_negative():
1022 for message in self.messages:
1023 for field in message.fields:
1024 if field.pbtype == 'ENUM' and field.ctype == enum.names:
1025 field.pbtype = 'UENUM'
1027 def generate_header(self, includes, headername, options):
1028 '''Generate content for a header file.
1029 Generates strings, which should be concatenated and stored to file.
1032 yield '/* Automatically generated nanopb header */\n'
1033 if options.notimestamp:
1034 yield '/* Generated by %s */\n\n' % (nanopb_version)
1036 yield '/* Generated by %s at %s. */\n\n' % (nanopb_version, time.asctime())
1038 symbol = make_identifier(headername)
1039 yield '#ifndef PB_%s_INCLUDED\n' % symbol
1040 yield '#define PB_%s_INCLUDED\n' % symbol
1042 yield options.libformat % ('pb.h')
1044 # no %s specified - use whatever was passed in as options.libformat
1045 yield options.libformat
1048 for incfile in includes:
1049 noext = os.path.splitext(incfile)[0]
1050 yield options.genformat % (noext + options.extension + '.h')
1053 yield '#if PB_PROTO_HEADER_VERSION != 30\n'
1054 yield '#error Regenerate this file with the current version of nanopb generator.\n'
1058 yield '#ifdef __cplusplus\n'
1059 yield 'extern "C" {\n'
1063 yield '/* Enum definitions */\n'
1064 for enum in self.enums:
1065 yield str(enum) + '\n\n'
1068 yield '/* Struct definitions */\n'
1069 for msg in sort_dependencies(self.messages):
1071 yield str(msg) + '\n\n'
1074 yield '/* Extensions */\n'
1075 for extension in self.extensions:
1076 yield extension.extension_decl()
1080 yield '/* Default values for struct fields */\n'
1081 for msg in self.messages:
1082 yield msg.default_decl(True)
1085 yield '/* Initializer values for message structs */\n'
1086 for msg in self.messages:
1087 identifier = '%s_init_default' % msg.name
1088 yield '#define %-40s %s\n' % (identifier, msg.get_initializer(False))
1089 for msg in self.messages:
1090 identifier = '%s_init_zero' % msg.name
1091 yield '#define %-40s %s\n' % (identifier, msg.get_initializer(True))
1094 yield '/* Field tags (for use in manual encoding/decoding) */\n'
1095 for msg in sort_dependencies(self.messages):
1096 for field in msg.fields:
1098 for extension in self.extensions:
1099 yield extension.tags()
1102 yield '/* Struct field encoding specification for nanopb */\n'
1103 for msg in self.messages:
1104 yield msg.fields_declaration() + '\n'
1107 yield '/* Maximum encoded size of messages (where known) */\n'
1108 for msg in self.messages:
1109 msize = msg.encoded_size(self.dependencies)
1110 if msize is not None:
1111 identifier = '%s_size' % msg.name
1112 yield '#define %-40s %s\n' % (identifier, msize)
1115 yield '/* Message IDs (where set with "msgid" option) */\n'
1117 yield '#ifdef PB_MSGID\n'
1118 for msg in self.messages:
1119 if hasattr(msg,'msgid'):
1120 yield '#define PB_MSG_%d %s\n' % (msg.msgid, msg.name)
1123 symbol = make_identifier(headername.split('.')[0])
1124 yield '#define %s_MESSAGES \\\n' % symbol
1126 for msg in self.messages:
1128 msize = msg.encoded_size(self.dependencies)
1129 if msize is not None:
1131 if hasattr(msg,'msgid'):
1132 yield '\tPB_MSG(%d,%s,%s) \\\n' % (msg.msgid, m, msg.name)
1135 for msg in self.messages:
1136 if hasattr(msg,'msgid'):
1137 yield '#define %s_msgid %d\n' % (msg.name, msg.msgid)
1142 yield '#ifdef __cplusplus\n'
1143 yield '} /* extern "C" */\n'
1149 def generate_source(self, headername, options):
1150 '''Generate content for a source file.'''
1152 yield '/* Automatically generated nanopb constant definitions */\n'
1153 if options.notimestamp:
1154 yield '/* Generated by %s */\n\n' % (nanopb_version)
1156 yield '/* Generated by %s at %s. */\n\n' % (nanopb_version, time.asctime())
1157 yield options.genformat % (headername)
1160 yield '#if PB_PROTO_HEADER_VERSION != 30\n'
1161 yield '#error Regenerate this file with the current version of nanopb generator.\n'
1165 for msg in self.messages:
1166 yield msg.default_decl(False)
1170 for msg in self.messages:
1171 yield msg.fields_definition() + '\n\n'
1173 for ext in self.extensions:
1174 yield ext.extension_def() + '\n'
1176 # Add checks for numeric limits
1178 largest_msg = max(self.messages, key = lambda m: m.count_required_fields())
1179 largest_count = largest_msg.count_required_fields()
1180 if largest_count > 64:
1181 yield '\n/* Check that missing required fields will be properly detected */\n'
1182 yield '#if PB_MAX_REQUIRED_FIELDS < %d\n' % largest_count
1183 yield '#error Properly detecting missing required fields in %s requires \\\n' % largest_msg.name
1184 yield ' setting PB_MAX_REQUIRED_FIELDS to %d or more.\n' % largest_count
1187 max_field = FieldMaxSize()
1188 checks_msgnames = []
1189 for msg in self.messages:
1190 checks_msgnames.append(msg.name)
1191 for field in msg.fields:
1192 max_field.extend(field.largest_field_value())
1194 worst = max_field.worst
1195 worst_field = max_field.worst_field
1196 checks = max_field.checks
1198 if worst > 255 or checks:
1199 yield '\n/* Check that field information fits in pb_field_t */\n'
1201 if worst > 65535 or checks:
1202 yield '#if !defined(PB_FIELD_32BIT)\n'
1204 yield '#error Field descriptor for %s is too large. Define PB_FIELD_32BIT to fix this.\n' % worst_field
1206 assertion = ' && '.join(str(c) + ' < 65536' for c in checks)
1207 msgs = '_'.join(str(n) for n in checks_msgnames)
1208 yield '/* If you get an error here, it means that you need to define PB_FIELD_32BIT\n'
1209 yield ' * compile-time option. You can do that in pb.h or on compiler command line.\n'
1211 yield ' * The reason you need to do this is that some of your messages contain tag\n'
1212 yield ' * numbers or field sizes that are larger than what can fit in 8 or 16 bit\n'
1213 yield ' * field descriptors.\n'
1215 yield 'PB_STATIC_ASSERT((%s), YOU_MUST_DEFINE_PB_FIELD_32BIT_FOR_MESSAGES_%s)\n'%(assertion,msgs)
1219 yield '#if !defined(PB_FIELD_16BIT) && !defined(PB_FIELD_32BIT)\n'
1221 yield '#error Field descriptor for %s is too large. Define PB_FIELD_16BIT to fix this.\n' % worst_field
1223 assertion = ' && '.join(str(c) + ' < 256' for c in checks)
1224 msgs = '_'.join(str(n) for n in checks_msgnames)
1225 yield '/* If you get an error here, it means that you need to define PB_FIELD_16BIT\n'
1226 yield ' * compile-time option. You can do that in pb.h or on compiler command line.\n'
1228 yield ' * The reason you need to do this is that some of your messages contain tag\n'
1229 yield ' * numbers or field sizes that are larger than what can fit in the default\n'
1230 yield ' * 8 bit descriptors.\n'
1232 yield 'PB_STATIC_ASSERT((%s), YOU_MUST_DEFINE_PB_FIELD_16BIT_FOR_MESSAGES_%s)\n'%(assertion,msgs)
1235 # Add check for sizeof(double)
1237 for msg in self.messages:
1238 for field in msg.fields:
1239 if field.ctype == 'double':
1244 yield '/* On some platforms (such as AVR), double is really float.\n'
1245 yield ' * These are not directly supported by nanopb, but see example_avr_double.\n'
1246 yield ' * To get rid of this error, remove any double fields from your .proto.\n'
1248 yield 'PB_STATIC_ASSERT(sizeof(double) == 8, DOUBLE_MUST_BE_8_BYTES)\n'
1252 # ---------------------------------------------------------------------------
1253 # Options parsing for the .proto files
1254 # ---------------------------------------------------------------------------
1256 from fnmatch import fnmatch
1258 def read_options_file(infile):
1259 '''Parse a separate options file to list:
1260 [(namemask, options), ...]
1263 data = infile.read()
1264 data = re.sub('/\*.*?\*/', '', data, flags = re.MULTILINE)
1265 data = re.sub('//.*?$', '', data, flags = re.MULTILINE)
1266 data = re.sub('#.*?$', '', data, flags = re.MULTILINE)
1267 for i, line in enumerate(data.split('\n')):
1272 parts = line.split(None, 1)
1275 sys.stderr.write("%s:%d: " % (infile.name, i + 1) +
1276 "Option lines should have space between field name and options. " +
1277 "Skipping line: '%s'\n" % line)
1280 opts = nanopb_pb2.NanoPBOptions()
1283 text_format.Merge(parts[1], opts)
1284 except Exception as e:
1285 sys.stderr.write("%s:%d: " % (infile.name, i + 1) +
1286 "Unparseable option line: '%s'. " % line +
1287 "Error: %s\n" % str(e))
1289 results.append((parts[0], opts))
1294 '''Ugly global variables, should find a good way to pass these.'''
1295 verbose_options = False
1296 separate_options = []
1297 matched_namemasks = set()
1299 def get_nanopb_suboptions(subdesc, options, name):
1300 '''Get copy of options, and merge information from subdesc.'''
1301 new_options = nanopb_pb2.NanoPBOptions()
1302 new_options.CopyFrom(options)
1304 # Handle options defined in a separate file
1305 dotname = '.'.join(name.parts)
1306 for namemask, options in Globals.separate_options:
1307 if fnmatch(dotname, namemask):
1308 Globals.matched_namemasks.add(namemask)
1309 new_options.MergeFrom(options)
1311 # Handle options defined in .proto
1312 if isinstance(subdesc.options, descriptor.FieldOptions):
1313 ext_type = nanopb_pb2.nanopb
1314 elif isinstance(subdesc.options, descriptor.FileOptions):
1315 ext_type = nanopb_pb2.nanopb_fileopt
1316 elif isinstance(subdesc.options, descriptor.MessageOptions):
1317 ext_type = nanopb_pb2.nanopb_msgopt
1318 elif isinstance(subdesc.options, descriptor.EnumOptions):
1319 ext_type = nanopb_pb2.nanopb_enumopt
1321 raise Exception("Unknown options type")
1323 if subdesc.options.HasExtension(ext_type):
1324 ext = subdesc.options.Extensions[ext_type]
1325 new_options.MergeFrom(ext)
1327 if Globals.verbose_options:
1328 sys.stderr.write("Options for " + dotname + ": ")
1329 sys.stderr.write(text_format.MessageToString(new_options) + "\n")
1334 # ---------------------------------------------------------------------------
1335 # Command line interface
1336 # ---------------------------------------------------------------------------
1340 from optparse import OptionParser
1342 optparser = OptionParser(
1343 usage = "Usage: nanopb_generator.py [options] file.pb ...",
1344 epilog = "Compile file.pb from file.proto by: 'protoc -ofile.pb file.proto'. " +
1345 "Output will be written to file.pb.h and file.pb.c.")
1346 optparser.add_option("-x", dest="exclude", metavar="FILE", action="append", default=[],
1347 help="Exclude file from generated #include list.")
1348 optparser.add_option("-e", "--extension", dest="extension", metavar="EXTENSION", default=".pb",
1349 help="Set extension to use instead of '.pb' for generated files. [default: %default]")
1350 optparser.add_option("-f", "--options-file", dest="options_file", metavar="FILE", default="%s.options",
1351 help="Set name of a separate generator options file.")
1352 optparser.add_option("-I", "--options-path", dest="options_path", metavar="DIR",
1353 action="append", default = [],
1354 help="Search for .options files additionally in this path")
1355 optparser.add_option("-Q", "--generated-include-format", dest="genformat",
1356 metavar="FORMAT", default='#include "%s"\n',
1357 help="Set format string to use for including other .pb.h files. [default: %default]")
1358 optparser.add_option("-L", "--library-include-format", dest="libformat",
1359 metavar="FORMAT", default='#include <%s>\n',
1360 help="Set format string to use for including the nanopb pb.h header. [default: %default]")
1361 optparser.add_option("-T", "--no-timestamp", dest="notimestamp", action="store_true", default=False,
1362 help="Don't add timestamp to .pb.h and .pb.c preambles")
1363 optparser.add_option("-q", "--quiet", dest="quiet", action="store_true", default=False,
1364 help="Don't print anything except errors.")
1365 optparser.add_option("-v", "--verbose", dest="verbose", action="store_true", default=False,
1366 help="Print more information.")
1367 optparser.add_option("-s", dest="settings", metavar="OPTION:VALUE", action="append", default=[],
1368 help="Set generator option (max_size, max_count etc.).")
1370 def parse_file(filename, fdesc, options):
1371 '''Parse a single file. Returns a ProtoFile instance.'''
1372 toplevel_options = nanopb_pb2.NanoPBOptions()
1373 for s in options.settings:
1374 text_format.Merge(s, toplevel_options)
1377 data = open(filename, 'rb').read()
1378 fdesc = descriptor.FileDescriptorSet.FromString(data).file[0]
1380 # Check if there is a separate .options file
1383 optfilename = options.options_file % os.path.splitext(filename)[0]
1385 # No %s specified, use the filename as-is
1386 optfilename = options.options_file
1389 paths = ['.'] + options.options_path
1391 if os.path.isfile(os.path.join(p, optfilename)):
1392 optfilename = os.path.join(p, optfilename)
1394 sys.stderr.write('Reading options from ' + optfilename + '\n')
1395 Globals.separate_options = read_options_file(open(optfilename, "rU"))
1398 # If we are given a full filename and it does not exist, give an error.
1399 # However, don't give error when we automatically look for .options file
1400 # with the same name as .proto.
1401 if options.verbose or had_abspath:
1402 sys.stderr.write('Options file not found: ' + optfilename + '\n')
1403 Globals.separate_options = []
1405 Globals.matched_namemasks = set()
1408 file_options = get_nanopb_suboptions(fdesc, toplevel_options, Names([filename]))
1409 f = ProtoFile(fdesc, file_options)
1410 f.optfilename = optfilename
1414 def process_file(filename, fdesc, options, other_files = {}):
1415 '''Process a single file.
1416 filename: The full path to the .proto or .pb source file, as string.
1417 fdesc: The loaded FileDescriptorSet, or None to read from the input file.
1418 options: Command line options as they come from OptionsParser.
1421 {'headername': Name of header file,
1422 'headerdata': Data for the .h header file,
1423 'sourcename': Name of the source code file,
1424 'sourcedata': Data for the .c source code file
1427 f = parse_file(filename, fdesc, options)
1429 # Provide dependencies if available
1430 for dep in f.fdesc.dependency:
1431 if dep in other_files:
1432 f.add_dependency(other_files[dep])
1434 # Decide the file names
1435 noext = os.path.splitext(filename)[0]
1436 headername = noext + options.extension + '.h'
1437 sourcename = noext + options.extension + '.c'
1438 headerbasename = os.path.basename(headername)
1440 # List of .proto files that should not be included in the C header file
1441 # even if they are mentioned in the source .proto.
1442 excludes = ['nanopb.proto', 'google/protobuf/descriptor.proto'] + options.exclude
1443 includes = [d for d in f.fdesc.dependency if d not in excludes]
1445 headerdata = ''.join(f.generate_header(includes, headerbasename, options))
1446 sourcedata = ''.join(f.generate_source(headerbasename, options))
1448 # Check if there were any lines in .options that did not match a member
1449 unmatched = [n for n,o in Globals.separate_options if n not in Globals.matched_namemasks]
1450 if unmatched and not options.quiet:
1451 sys.stderr.write("Following patterns in " + f.optfilename + " did not match any fields: "
1452 + ', '.join(unmatched) + "\n")
1453 if not Globals.verbose_options:
1454 sys.stderr.write("Use protoc --nanopb-out=-v:. to see a list of the field names.\n")
1456 return {'headername': headername, 'headerdata': headerdata,
1457 'sourcename': sourcename, 'sourcedata': sourcedata}
1460 '''Main function when invoked directly from the command line.'''
1462 options, filenames = optparser.parse_args()
1465 optparser.print_help()
1469 options.verbose = False
1471 Globals.verbose_options = options.verbose
1473 for filename in filenames:
1474 results = process_file(filename, None, options)
1476 if not options.quiet:
1477 sys.stderr.write("Writing to " + results['headername'] + " and "
1478 + results['sourcename'] + "\n")
1480 open(results['headername'], 'w').write(results['headerdata'])
1481 open(results['sourcename'], 'w').write(results['sourcedata'])
1484 '''Main function when invoked as a protoc plugin.'''
1487 if sys.platform == "win32":
1489 # Set stdin and stdout to binary mode
1490 msvcrt.setmode(sys.stdin.fileno(), os.O_BINARY)
1491 msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
1493 data = io.open(sys.stdin.fileno(), "rb").read()
1495 request = plugin_pb2.CodeGeneratorRequest.FromString(data)
1498 # Versions of Python prior to 2.7.3 do not support unicode
1499 # input to shlex.split(). Try to convert to str if possible.
1500 params = str(request.parameter)
1501 except UnicodeEncodeError:
1502 params = request.parameter
1505 args = shlex.split(params)
1506 options, dummy = optparser.parse_args(args)
1508 Globals.verbose_options = options.verbose
1510 response = plugin_pb2.CodeGeneratorResponse()
1512 # Google's protoc does not currently indicate the full path of proto files.
1513 # Instead always add the main file path to the search dirs, that works for
1516 options.options_path.append(os.path.dirname(request.file_to_generate[0]))
1518 # Process any include files first, in order to have them
1519 # available as dependencies
1521 for fdesc in request.proto_file:
1522 other_files[fdesc.name] = parse_file(fdesc.name, fdesc, options)
1524 for filename in request.file_to_generate:
1525 for fdesc in request.proto_file:
1526 if fdesc.name == filename:
1527 results = process_file(filename, fdesc, options, other_files)
1529 f = response.file.add()
1530 f.name = results['headername']
1531 f.content = results['headerdata']
1533 f = response.file.add()
1534 f.name = results['sourcename']
1535 f.content = results['sourcedata']
1537 io.open(sys.stdout.fileno(), "wb").write(response.SerializeToString())
1539 if __name__ == '__main__':
1540 # Check if we are running as a plugin under protoc
1541 if 'protoc-gen-' in sys.argv[0] or '--protoc-plugin' in sys.argv: