3 '''Generate header file for nanopb from a ProtoBuf FileDescriptorSet.'''
4 nanopb_version = "nanopb-0.2.6-dev"
9 # Add some dummy imports to keep packaging tools happy.
10 import google, distutils.util # bbfreeze seems to need these
11 import pkg_resources # pyinstaller / protobuf 2.5 seem to need these
13 # Don't care, we will error out later if it is actually important.
17 import google.protobuf.text_format as text_format
18 import google.protobuf.descriptor_pb2 as descriptor
21 *************************************************************
22 *** Could not import the Google protobuf Python libraries ***
23 *** Try installing package 'python-protobuf' or similar. ***
24 *************************************************************
29 import proto.nanopb_pb2 as nanopb_pb2
30 import proto.plugin_pb2 as plugin_pb2
33 ********************************************************************
34 *** Failed to import the protocol definitions for generator. ***
35 *** You have to run 'make' in the nanopb/generator/proto folder. ***
36 ********************************************************************
40 # ---------------------------------------------------------------------------
41 # Generation of single fields
42 # ---------------------------------------------------------------------------
47 # Values are tuple (c type, pb type, encoded size)
48 FieldD = descriptor.FieldDescriptorProto
50 FieldD.TYPE_BOOL: ('bool', 'BOOL', 1),
51 FieldD.TYPE_DOUBLE: ('double', 'DOUBLE', 8),
52 FieldD.TYPE_FIXED32: ('uint32_t', 'FIXED32', 4),
53 FieldD.TYPE_FIXED64: ('uint64_t', 'FIXED64', 8),
54 FieldD.TYPE_FLOAT: ('float', 'FLOAT', 4),
55 FieldD.TYPE_INT32: ('int32_t', 'INT32', 10),
56 FieldD.TYPE_INT64: ('int64_t', 'INT64', 10),
57 FieldD.TYPE_SFIXED32: ('int32_t', 'SFIXED32', 4),
58 FieldD.TYPE_SFIXED64: ('int64_t', 'SFIXED64', 8),
59 FieldD.TYPE_SINT32: ('int32_t', 'SINT32', 5),
60 FieldD.TYPE_SINT64: ('int64_t', 'SINT64', 10),
61 FieldD.TYPE_UINT32: ('uint32_t', 'UINT32', 5),
62 FieldD.TYPE_UINT64: ('uint64_t', 'UINT64', 10)
66 '''Keeps a set of nested names and formats them to C identifier.'''
67 def __init__(self, parts = ()):
68 if isinstance(parts, Names):
70 self.parts = tuple(parts)
73 return '_'.join(self.parts)
75 def __add__(self, other):
76 if isinstance(other, (str, unicode)):
77 return Names(self.parts + (other,))
78 elif isinstance(other, tuple):
79 return Names(self.parts + other)
81 raise ValueError("Name parts should be of type str")
83 def __eq__(self, other):
84 return isinstance(other, Names) and self.parts == other.parts
86 def names_from_type_name(type_name):
87 '''Parse Names() from FieldDescriptorProto type_name'''
88 if type_name[0] != '.':
89 raise NotImplementedError("Lookup of non-absolute type names is not supported")
90 return Names(type_name[1:].split('.'))
92 def varint_max_size(max_value):
93 '''Returns the maximum number of bytes a varint can take when encoded.'''
94 for i in range(1, 11):
95 if (max_value >> (i * 7)) == 0:
97 raise ValueError("Value too large for varint: " + str(max_value))
99 assert varint_max_size(0) == 1
100 assert varint_max_size(127) == 1
101 assert varint_max_size(128) == 2
104 '''Class used to represent the encoded size of a field or a message.
105 Consists of a combination of symbolic sizes and integer sizes.'''
106 def __init__(self, value = 0, symbols = []):
107 if isinstance(value, (str, Names)):
108 symbols = [str(value)]
111 self.symbols = symbols
113 def __add__(self, other):
114 if isinstance(other, (int, long)):
115 return EncodedSize(self.value + other, self.symbols)
116 elif isinstance(other, (str, Names)):
117 return EncodedSize(self.value, self.symbols + [str(other)])
118 elif isinstance(other, EncodedSize):
119 return EncodedSize(self.value + other.value, self.symbols + other.symbols)
121 raise ValueError("Cannot add size: " + repr(other))
123 def __mul__(self, other):
124 if isinstance(other, (int, long)):
125 return EncodedSize(self.value * other, [str(other) + '*' + s for s in self.symbols])
127 raise ValueError("Cannot multiply size: " + repr(other))
131 return str(self.value)
133 return '(' + str(self.value) + ' + ' + ' + '.join(self.symbols) + ')'
135 def upperlimit(self):
142 def __init__(self, names, desc, enum_options):
143 '''desc is EnumDescriptorProto'''
145 self.options = enum_options
146 self.names = names + desc.name
148 if enum_options.long_names:
149 self.values = [(self.names + x.name, x.number) for x in desc.value]
151 self.values = [(names + x.name, x.number) for x in desc.value]
153 self.value_longnames = [self.names + x.name for x in desc.value]
156 result = 'typedef enum _%s {\n' % self.names
157 result += ',\n'.join([" %s = %d" % x for x in self.values])
158 result += '\n} %s;' % self.names
162 def __init__(self, struct_name, desc, field_options):
163 '''desc is FieldDescriptorProto'''
164 self.tag = desc.number
165 self.struct_name = struct_name
166 self.name = desc.name
169 self.max_count = None
174 # Parse field options
175 if field_options.HasField("max_size"):
176 self.max_size = field_options.max_size
178 if field_options.HasField("max_count"):
179 self.max_count = field_options.max_count
181 if desc.HasField('default_value'):
182 self.default = desc.default_value
184 # Check field rules, i.e. required/optional/repeated.
186 if desc.label == FieldD.LABEL_REQUIRED:
187 self.rules = 'REQUIRED'
188 elif desc.label == FieldD.LABEL_OPTIONAL:
189 self.rules = 'OPTIONAL'
190 elif desc.label == FieldD.LABEL_REPEATED:
191 self.rules = 'REPEATED'
192 if self.max_count is None:
193 can_be_static = False
195 self.array_decl = '[%d]' % self.max_count
197 raise NotImplementedError(desc.label)
199 # Check if the field can be implemented with static allocation
200 # i.e. whether the data size is known.
201 if desc.type == FieldD.TYPE_STRING and self.max_size is None:
202 can_be_static = False
204 if desc.type == FieldD.TYPE_BYTES and self.max_size is None:
205 can_be_static = False
207 # Decide how the field data will be allocated
208 if field_options.type == nanopb_pb2.FT_DEFAULT:
210 field_options.type = nanopb_pb2.FT_STATIC
212 field_options.type = nanopb_pb2.FT_CALLBACK
214 if field_options.type == nanopb_pb2.FT_STATIC and not can_be_static:
215 raise Exception("Field %s is defined as static, but max_size or "
216 "max_count is not given." % self.name)
218 if field_options.type == nanopb_pb2.FT_STATIC:
219 self.allocation = 'STATIC'
220 elif field_options.type == nanopb_pb2.FT_POINTER:
221 self.allocation = 'POINTER'
222 elif field_options.type == nanopb_pb2.FT_CALLBACK:
223 self.allocation = 'CALLBACK'
225 raise NotImplementedError(field_options.type)
227 # Decide the C data type to use in the struct.
228 if datatypes.has_key(desc.type):
229 self.ctype, self.pbtype, self.enc_size = datatypes[desc.type]
230 elif desc.type == FieldD.TYPE_ENUM:
232 self.ctype = names_from_type_name(desc.type_name)
233 if self.default is not None:
234 self.default = self.ctype + self.default
235 self.enc_size = 5 # protoc rejects enum values > 32 bits
236 elif desc.type == FieldD.TYPE_STRING:
237 self.pbtype = 'STRING'
239 if self.allocation == 'STATIC':
241 self.array_decl += '[%d]' % self.max_size
242 self.enc_size = varint_max_size(self.max_size) + self.max_size
243 elif desc.type == FieldD.TYPE_BYTES:
244 self.pbtype = 'BYTES'
245 if self.allocation == 'STATIC':
246 self.ctype = self.struct_name + self.name + 't'
247 self.enc_size = varint_max_size(self.max_size) + self.max_size
248 elif self.allocation == 'POINTER':
249 self.ctype = 'pb_bytes_ptr_t'
250 elif desc.type == FieldD.TYPE_MESSAGE:
251 self.pbtype = 'MESSAGE'
252 self.ctype = self.submsgname = names_from_type_name(desc.type_name)
253 self.enc_size = None # Needs to be filled in after the message type is available
255 raise NotImplementedError(desc.type)
257 def __cmp__(self, other):
258 return cmp(self.tag, other.tag)
262 if self.allocation == 'POINTER':
263 if self.rules == 'REPEATED':
264 result += ' size_t ' + self.name + '_count;\n'
266 if self.pbtype == 'MESSAGE':
267 # Use struct definition, so recursive submessages are possible
268 result += ' struct _%s *%s;' % (self.ctype, self.name)
269 elif self.rules == 'REPEATED' and self.pbtype == 'STRING':
270 # String arrays need to be defined as pointers to pointers
271 result += ' %s **%s;' % (self.ctype, self.name)
273 result += ' %s *%s;' % (self.ctype, self.name)
274 elif self.allocation == 'CALLBACK':
275 result += ' pb_callback_t %s;' % self.name
277 if self.rules == 'OPTIONAL' and self.allocation == 'STATIC':
278 result += ' bool has_' + self.name + ';\n'
279 elif self.rules == 'REPEATED' and self.allocation == 'STATIC':
280 result += ' size_t ' + self.name + '_count;\n'
281 result += ' %s %s%s;' % (self.ctype, self.name, self.array_decl)
285 '''Return definitions for any special types this field might need.'''
286 if self.pbtype == 'BYTES' and self.allocation == 'STATIC':
287 result = 'typedef struct {\n'
288 result += ' size_t size;\n'
289 result += ' uint8_t bytes[%d];\n' % self.max_size
290 result += '} %s;\n' % self.ctype
295 def default_decl(self, declaration_only = False):
296 '''Return definition for this field's default value.'''
297 if self.default is None:
300 ctype, default = self.ctype, self.default
303 if self.pbtype == 'STRING':
304 if self.allocation != 'STATIC':
305 return None # Not implemented
307 array_decl = '[%d]' % self.max_size
308 default = str(self.default).encode('string_escape')
309 default = default.replace('"', '\\"')
310 default = '"' + default + '"'
311 elif self.pbtype == 'BYTES':
312 if self.allocation != 'STATIC':
313 return None # Not implemented
315 data = self.default.decode('string_escape')
316 data = ['0x%02x' % ord(c) for c in data]
317 default = '{%d, {%s}}' % (len(data), ','.join(data))
318 elif self.pbtype in ['FIXED32', 'UINT32']:
320 elif self.pbtype in ['FIXED64', 'UINT64']:
322 elif self.pbtype in ['SFIXED64', 'INT64']:
326 return 'extern const %s %s_default%s;' % (ctype, self.struct_name + self.name, array_decl)
328 return 'const %s %s_default%s = %s;' % (ctype, self.struct_name + self.name, array_decl, default)
331 '''Return the #define for the tag number of this field.'''
332 identifier = '%s_%s_tag' % (self.struct_name, self.name)
333 return '#define %-40s %d\n' % (identifier, self.tag)
335 def pb_field_t(self, prev_field_name):
336 '''Return the pb_field_t initializer to use in the constant array.
337 prev_field_name is the name of the previous field or None.
339 result = ' PB_FIELD2(%3d, ' % self.tag
340 result += '%-8s, ' % self.pbtype
341 result += '%s, ' % self.rules
342 result += '%-8s, ' % self.allocation
343 result += '%s, ' % ("FIRST" if not prev_field_name else "OTHER")
344 result += '%s, ' % self.struct_name
345 result += '%s, ' % self.name
346 result += '%s, ' % (prev_field_name or self.name)
348 if self.pbtype == 'MESSAGE':
349 result += '&%s_fields)' % self.submsgname
350 elif self.default is None:
352 elif self.pbtype in ['BYTES', 'STRING'] and self.allocation != 'STATIC':
353 result += '0)' # Arbitrary size default values not implemented
355 result += '&%s_default)' % (self.struct_name + self.name)
359 def largest_field_value(self):
360 '''Determine if this field needs 16bit or 32bit pb_field_t structure to compile properly.
361 Returns numeric value or a C-expression for assert.'''
362 if self.pbtype == 'MESSAGE':
363 if self.rules == 'REPEATED' and self.allocation == 'STATIC':
364 return 'pb_membersize(%s, %s[0])' % (self.struct_name, self.name)
366 return 'pb_membersize(%s, %s)' % (self.struct_name, self.name)
368 return max(self.tag, self.max_size, self.max_count)
370 def encoded_size(self, allmsgs):
371 '''Return the maximum size that this field can take when encoded,
372 including the field tag. If the size cannot be determined, returns
375 if self.allocation != 'STATIC':
378 if self.pbtype == 'MESSAGE':
380 if msg.name == self.submsgname:
381 encsize = msg.encoded_size(allmsgs)
383 return None # Submessage size is indeterminate
385 # Include submessage length prefix
386 encsize += varint_max_size(encsize.upperlimit())
389 # Submessage cannot be found, this currently occurs when
390 # the submessage type is defined in a different file.
391 # Instead of direct numeric value, reference the size that
392 # has been #defined in the other file.
393 encsize = EncodedSize(self.submsgname + 'size')
395 # We will have to make a conservative assumption on the length
396 # prefix size, though.
399 elif self.enc_size is None:
400 raise RuntimeError("Could not determine encoded size for %s.%s"
401 % (self.struct_name, self.name))
403 encsize = EncodedSize(self.enc_size)
405 encsize += varint_max_size(self.tag << 3) # Tag + wire type
407 if self.rules == 'REPEATED':
408 # Decoders must be always able to handle unpacked arrays.
409 # Therefore we have to reserve space for it, even though
410 # we emit packed arrays ourselves.
411 encsize *= self.max_count
416 class ExtensionRange(Field):
417 def __init__(self, struct_name, range_start, field_options):
418 '''Implements a special pb_extension_t* field in an extensible message
419 structure. The range_start signifies the index at which the extensions
420 start. Not necessarily all tags above this are extensions, it is merely
421 a speed optimization.
423 self.tag = range_start
424 self.struct_name = struct_name
425 self.name = 'extensions'
426 self.pbtype = 'EXTENSION'
427 self.rules = 'OPTIONAL'
428 self.allocation = 'CALLBACK'
429 self.ctype = 'pb_extension_t'
436 return ' pb_extension_t *extensions;'
444 def encoded_size(self, allmsgs):
445 # We exclude extensions from the count, because they cannot be known
446 # until runtime. Other option would be to return None here, but this
447 # way the value remains useful if extensions are not used.
448 return EncodedSize(0)
450 class ExtensionField(Field):
451 def __init__(self, struct_name, desc, field_options):
452 self.fullname = struct_name + desc.name
453 self.extendee_name = names_from_type_name(desc.extendee)
454 Field.__init__(self, self.fullname + 'struct', desc, field_options)
456 if self.rules != 'OPTIONAL':
460 self.rules = 'OPTEXT'
463 '''Return the #define for the tag number of this field.'''
464 identifier = '%s_tag' % self.fullname
465 return '#define %-40s %d\n' % (identifier, self.tag)
467 def extension_decl(self):
468 '''Declaration of the extension type in the .pb.h file'''
470 msg = '/* Extension field %s was skipped because only "optional"\n' % self.fullname
471 msg +=' type of extension fields is currently supported. */\n'
474 return 'extern const pb_extension_type_t %s;\n' % self.fullname
476 def extension_def(self):
477 '''Definition of the extension type in the .pb.c file'''
482 result = 'typedef struct {\n'
484 result += '\n} %s;\n\n' % self.struct_name
485 result += ('static const pb_field_t %s_field = \n %s;\n\n' %
486 (self.fullname, self.pb_field_t(None)))
487 result += 'const pb_extension_type_t %s = {\n' % self.fullname
490 result += ' &%s_field\n' % self.fullname
495 # ---------------------------------------------------------------------------
496 # Generation of messages (structures)
497 # ---------------------------------------------------------------------------
501 def __init__(self, names, desc, message_options):
506 field_options = get_nanopb_suboptions(f, message_options, self.name + f.name)
507 if field_options.type != nanopb_pb2.FT_IGNORE:
508 self.fields.append(Field(self.name, f, field_options))
510 if len(desc.extension_range) > 0:
511 field_options = get_nanopb_suboptions(desc, message_options, self.name + 'extensions')
512 range_start = min([r.start for r in desc.extension_range])
513 if field_options.type != nanopb_pb2.FT_IGNORE:
514 self.fields.append(ExtensionRange(self.name, range_start, field_options))
516 self.packed = message_options.packed_struct
517 self.ordered_fields = self.fields[:]
518 self.ordered_fields.sort()
520 def get_dependencies(self):
521 '''Get list of type names that this structure refers to.'''
522 return [str(field.ctype) for field in self.fields]
525 result = 'typedef struct _%s {\n' % self.name
527 if not self.ordered_fields:
528 # Empty structs are not allowed in C standard.
529 # Therefore add a dummy field if an empty message occurs.
530 result += ' uint8_t dummy_field;'
532 result += '\n'.join([str(f) for f in self.ordered_fields])
536 result += ' pb_packed'
538 result += ' %s;' % self.name
541 result = 'PB_PACKED_STRUCT_START\n' + result
542 result += '\nPB_PACKED_STRUCT_END'
548 for field in self.fields:
549 types = field.types()
550 if types is not None:
551 result += types + '\n'
554 def default_decl(self, declaration_only = False):
556 for field in self.fields:
557 default = field.default_decl(declaration_only)
558 if default is not None:
559 result += default + '\n'
562 def fields_declaration(self):
563 result = 'extern const pb_field_t %s_fields[%d];' % (self.name, len(self.fields) + 1)
566 def fields_definition(self):
567 result = 'const pb_field_t %s_fields[%d] = {\n' % (self.name, len(self.fields) + 1)
570 for field in self.ordered_fields:
571 result += field.pb_field_t(prev)
575 result += ' PB_LAST_FIELD\n};'
578 def encoded_size(self, allmsgs):
579 '''Return the maximum size that this message can take when encoded.
580 If the size cannot be determined, returns None.
582 size = EncodedSize(0)
583 for field in self.fields:
584 fsize = field.encoded_size(allmsgs)
592 # ---------------------------------------------------------------------------
593 # Processing of entire .proto files
594 # ---------------------------------------------------------------------------
597 def iterate_messages(desc, names = Names()):
598 '''Recursively find all messages. For each, yield name, DescriptorProto.'''
599 if hasattr(desc, 'message_type'):
600 submsgs = desc.message_type
602 submsgs = desc.nested_type
604 for submsg in submsgs:
605 sub_names = names + submsg.name
606 yield sub_names, submsg
608 for x in iterate_messages(submsg, sub_names):
611 def iterate_extensions(desc, names = Names()):
612 '''Recursively find all extensions.
613 For each, yield name, FieldDescriptorProto.
615 for extension in desc.extension:
616 yield names, extension
618 for subname, subdesc in iterate_messages(desc, names):
619 for extension in subdesc.extension:
620 yield subname, extension
622 def parse_file(fdesc, file_options):
623 '''Takes a FileDescriptorProto and returns tuple (enums, messages, extensions).'''
630 base_name = Names(fdesc.package.split('.'))
634 for enum in fdesc.enum_type:
635 enum_options = get_nanopb_suboptions(enum, file_options, base_name + enum.name)
636 enums.append(Enum(base_name, enum, enum_options))
638 for names, message in iterate_messages(fdesc, base_name):
639 message_options = get_nanopb_suboptions(message, file_options, names)
640 messages.append(Message(names, message, message_options))
641 for enum in message.enum_type:
642 enum_options = get_nanopb_suboptions(enum, message_options, names + enum.name)
643 enums.append(Enum(names, enum, enum_options))
645 for names, extension in iterate_extensions(fdesc, base_name):
646 field_options = get_nanopb_suboptions(extension, file_options, names)
647 if field_options.type != nanopb_pb2.FT_IGNORE:
648 extensions.append(ExtensionField(names, extension, field_options))
650 # Fix field default values where enum short names are used.
652 if not enum.options.long_names:
653 for message in messages:
654 for field in message.fields:
655 if field.default in enum.value_longnames:
656 idx = enum.value_longnames.index(field.default)
657 field.default = enum.values[idx][0]
659 return enums, messages, extensions
663 From http://code.activestate.com/recipes/577413-topological-sort/
664 This function is under the MIT license.
666 for k, v in data.items():
667 v.discard(k) # Ignore self dependencies
668 extra_items_in_deps = reduce(set.union, data.values(), set()) - set(data.keys())
669 data.update(dict([(item, set()) for item in extra_items_in_deps]))
671 ordered = set(item for item,dep in data.items() if not dep)
674 for item in sorted(ordered):
676 data = dict([(item, (dep - ordered)) for item,dep in data.items()
677 if item not in ordered])
678 assert not data, "A cyclic dependency exists amongst %r" % data
680 def sort_dependencies(messages):
681 '''Sort a list of Messages based on dependencies.'''
684 for message in messages:
685 dependencies[str(message.name)] = set(message.get_dependencies())
686 message_by_name[str(message.name)] = message
688 for msgname in toposort2(dependencies):
689 if msgname in message_by_name:
690 yield message_by_name[msgname]
692 def make_identifier(headername):
693 '''Make #ifndef identifier that contains uppercase A-Z and digits 0-9'''
695 for c in headername.upper():
702 def generate_header(dependencies, headername, enums, messages, extensions, options):
703 '''Generate content for a header file.
704 Generates strings, which should be concatenated and stored to file.
707 yield '/* Automatically generated nanopb header */\n'
708 yield '/* Generated by %s at %s. */\n\n' % (nanopb_version, time.asctime())
710 symbol = make_identifier(headername)
711 yield '#ifndef _PB_%s_\n' % symbol
712 yield '#define _PB_%s_\n' % symbol
714 yield options.libformat % ('pb.h')
716 # no %s specified - use whatever was passed in as options.libformat
717 yield options.libformat
720 for dependency in dependencies:
721 noext = os.path.splitext(dependency)[0]
722 yield options.genformat % (noext + '.' + options.extension + '.h')
725 yield '#ifdef __cplusplus\n'
726 yield 'extern "C" {\n'
729 yield '/* Enum definitions */\n'
731 yield str(enum) + '\n\n'
733 yield '/* Struct definitions */\n'
734 for msg in sort_dependencies(messages):
736 yield str(msg) + '\n\n'
739 yield '/* Extensions */\n'
740 for extension in extensions:
741 yield extension.extension_decl()
744 yield '/* Default values for struct fields */\n'
746 yield msg.default_decl(True)
749 yield '/* Field tags (for use in manual encoding/decoding) */\n'
750 for msg in sort_dependencies(messages):
751 for field in msg.fields:
753 for extension in extensions:
754 yield extension.tags()
757 yield '/* Struct field encoding specification for nanopb */\n'
759 yield msg.fields_declaration() + '\n'
762 yield '/* Maximum encoded size of messages (where known) */\n'
764 msize = msg.encoded_size(messages)
765 if msize is not None:
766 identifier = '%s_size' % msg.name
767 yield '#define %-40s %s\n' % (identifier, msize)
770 yield '#ifdef __cplusplus\n'
771 yield '} /* extern "C" */\n'
777 def generate_source(headername, enums, messages, extensions, options):
778 '''Generate content for a source file.'''
780 yield '/* Automatically generated nanopb constant definitions */\n'
781 yield '/* Generated by %s at %s. */\n\n' % (nanopb_version, time.asctime())
782 yield options.genformat % (headername)
786 yield msg.default_decl(False)
791 yield msg.fields_definition() + '\n\n'
793 for ext in extensions:
794 yield ext.extension_def() + '\n'
796 # Add checks for numeric limits
798 count_required_fields = lambda m: len([f for f in msg.fields if f.rules == 'REQUIRED'])
799 largest_msg = max(messages, key = count_required_fields)
800 largest_count = count_required_fields(largest_msg)
801 if largest_count > 64:
802 yield '\n/* Check that missing required fields will be properly detected */\n'
803 yield '#if PB_MAX_REQUIRED_FIELDS < %d\n' % largest_count
804 yield '#error Properly detecting missing required fields in %s requires \\\n' % largest_msg.name
805 yield ' setting PB_MAX_REQUIRED_FIELDS to %d or more.\n' % largest_count
813 checks_msgnames.append(msg.name)
814 for field in msg.fields:
815 status = field.largest_field_value()
816 if isinstance(status, (str, unicode)):
817 checks.append(status)
820 worst_field = str(field.struct_name) + '.' + str(field.name)
822 if worst > 255 or checks:
823 yield '\n/* Check that field information fits in pb_field_t */\n'
825 if worst > 65535 or checks:
826 yield '#if !defined(PB_FIELD_32BIT)\n'
828 yield '#error Field descriptor for %s is too large. Define PB_FIELD_32BIT to fix this.\n' % worst_field
830 assertion = ' && '.join(str(c) + ' < 65536' for c in checks)
831 msgs = '_'.join(str(n) for n in checks_msgnames)
832 yield '/* If you get an error here, it means that you need to define PB_FIELD_32BIT\n'
833 yield ' * compile-time option. You can do that in pb.h or on compiler command line.\n'
835 yield ' * The reason you need to do this is that some of your messages contain tag\n'
836 yield ' * numbers or field sizes that are larger than what can fit in 8 or 16 bit\n'
837 yield ' * field descriptors.\n'
839 yield 'STATIC_ASSERT((%s), YOU_MUST_DEFINE_PB_FIELD_32BIT_FOR_MESSAGES_%s)\n'%(assertion,msgs)
843 yield '#if !defined(PB_FIELD_16BIT) && !defined(PB_FIELD_32BIT)\n'
845 yield '#error Field descriptor for %s is too large. Define PB_FIELD_16BIT to fix this.\n' % worst_field
847 assertion = ' && '.join(str(c) + ' < 256' for c in checks)
848 msgs = '_'.join(str(n) for n in checks_msgnames)
849 yield '/* If you get an error here, it means that you need to define PB_FIELD_16BIT\n'
850 yield ' * compile-time option. You can do that in pb.h or on compiler command line.\n'
852 yield ' * The reason you need to do this is that some of your messages contain tag\n'
853 yield ' * numbers or field sizes that are larger than what can fit in the default\n'
854 yield ' * 8 bit descriptors.\n'
856 yield 'STATIC_ASSERT((%s), YOU_MUST_DEFINE_PB_FIELD_16BIT_FOR_MESSAGES_%s)\n'%(assertion,msgs)
859 # Add check for sizeof(double)
862 for field in msg.fields:
863 if field.ctype == 'double':
868 yield '/* On some platforms (such as AVR), double is really float.\n'
869 yield ' * These are not directly supported by nanopb, but see example_avr_double.\n'
870 yield ' * To get rid of this error, remove any double fields from your .proto.\n'
872 yield 'STATIC_ASSERT(sizeof(double) == 8, DOUBLE_MUST_BE_8_BYTES)\n'
876 # ---------------------------------------------------------------------------
877 # Options parsing for the .proto files
878 # ---------------------------------------------------------------------------
880 from fnmatch import fnmatch
882 def read_options_file(infile):
883 '''Parse a separate options file to list:
884 [(namemask, options), ...]
889 if not line or line.startswith('//') or line.startswith('#'):
892 parts = line.split(None, 1)
893 opts = nanopb_pb2.NanoPBOptions()
894 text_format.Merge(parts[1], opts)
895 results.append((parts[0], opts))
900 '''Ugly global variables, should find a good way to pass these.'''
901 verbose_options = False
902 separate_options = []
903 matched_namemasks = set()
905 def get_nanopb_suboptions(subdesc, options, name):
906 '''Get copy of options, and merge information from subdesc.'''
907 new_options = nanopb_pb2.NanoPBOptions()
908 new_options.CopyFrom(options)
910 # Handle options defined in a separate file
911 dotname = '.'.join(name.parts)
912 for namemask, options in Globals.separate_options:
913 if fnmatch(dotname, namemask):
914 Globals.matched_namemasks.add(namemask)
915 new_options.MergeFrom(options)
917 # Handle options defined in .proto
918 if isinstance(subdesc.options, descriptor.FieldOptions):
919 ext_type = nanopb_pb2.nanopb
920 elif isinstance(subdesc.options, descriptor.FileOptions):
921 ext_type = nanopb_pb2.nanopb_fileopt
922 elif isinstance(subdesc.options, descriptor.MessageOptions):
923 ext_type = nanopb_pb2.nanopb_msgopt
924 elif isinstance(subdesc.options, descriptor.EnumOptions):
925 ext_type = nanopb_pb2.nanopb_enumopt
927 raise Exception("Unknown options type")
929 if subdesc.options.HasExtension(ext_type):
930 ext = subdesc.options.Extensions[ext_type]
931 new_options.MergeFrom(ext)
933 if Globals.verbose_options:
934 sys.stderr.write("Options for " + dotname + ": ")
935 sys.stderr.write(text_format.MessageToString(new_options) + "\n")
940 # ---------------------------------------------------------------------------
941 # Command line interface
942 # ---------------------------------------------------------------------------
946 from optparse import OptionParser
948 optparser = OptionParser(
949 usage = "Usage: nanopb_generator.py [options] file.pb ...",
950 epilog = "Compile file.pb from file.proto by: 'protoc -ofile.pb file.proto'. " +
951 "Output will be written to file.pb.h and file.pb.c.")
952 optparser.add_option("-x", dest="exclude", metavar="FILE", action="append", default=[],
953 help="Exclude file from generated #include list.")
954 optparser.add_option("-e", "--extension", dest="extension", metavar="EXTENSION", default="pb",
955 help="Set extension to use instead of 'pb' for generated files. [default: %default]")
956 optparser.add_option("-f", "--options-file", dest="options_file", metavar="FILE", default="%s.options",
957 help="Set name of a separate generator options file.")
958 optparser.add_option("-Q", "--generated-include-format", dest="genformat",
959 metavar="FORMAT", default='#include "%s"\n',
960 help="Set format string to use for including other .pb.h files. [default: %default]")
961 optparser.add_option("-L", "--library-include-format", dest="libformat",
962 metavar="FORMAT", default='#include <%s>\n',
963 help="Set format string to use for including the nanopb pb.h header. [default: %default]")
964 optparser.add_option("-q", "--quiet", dest="quiet", action="store_true", default=False,
965 help="Don't print anything except errors.")
966 optparser.add_option("-v", "--verbose", dest="verbose", action="store_true", default=False,
967 help="Print more information.")
968 optparser.add_option("-s", dest="settings", metavar="OPTION:VALUE", action="append", default=[],
969 help="Set generator option (max_size, max_count etc.).")
971 def process_file(filename, fdesc, options):
972 '''Process a single file.
973 filename: The full path to the .proto or .pb source file, as string.
974 fdesc: The loaded FileDescriptorSet, or None to read from the input file.
975 options: Command line options as they come from OptionsParser.
978 {'headername': Name of header file,
979 'headerdata': Data for the .h header file,
980 'sourcename': Name of the source code file,
981 'sourcedata': Data for the .c source code file
984 toplevel_options = nanopb_pb2.NanoPBOptions()
985 for s in options.settings:
986 text_format.Merge(s, toplevel_options)
989 data = open(filename, 'rb').read()
990 fdesc = descriptor.FileDescriptorSet.FromString(data).file[0]
992 # Check if there is a separate .options file
994 optfilename = options.options_file % os.path.splitext(filename)[0]
996 # No %s specified, use the filename as-is
997 optfilename = options.options_file
999 if os.path.isfile(optfilename):
1001 sys.stderr.write('Reading options from ' + optfilename + '\n')
1003 Globals.separate_options = read_options_file(open(optfilename, "rU"))
1005 Globals.separate_options = []
1006 Globals.matched_namemasks = set()
1009 file_options = get_nanopb_suboptions(fdesc, toplevel_options, Names([filename]))
1010 enums, messages, extensions = parse_file(fdesc, file_options)
1012 # Decide the file names
1013 noext = os.path.splitext(filename)[0]
1014 headername = noext + '.' + options.extension + '.h'
1015 sourcename = noext + '.' + options.extension + '.c'
1016 headerbasename = os.path.basename(headername)
1018 # List of .proto files that should not be included in the C header file
1019 # even if they are mentioned in the source .proto.
1020 excludes = ['nanopb.proto', 'google/protobuf/descriptor.proto'] + options.exclude
1021 dependencies = [d for d in fdesc.dependency if d not in excludes]
1023 headerdata = ''.join(generate_header(dependencies, headerbasename, enums,
1024 messages, extensions, options))
1026 sourcedata = ''.join(generate_source(headerbasename, enums,
1027 messages, extensions, options))
1029 # Check if there were any lines in .options that did not match a member
1030 unmatched = [n for n,o in Globals.separate_options if n not in Globals.matched_namemasks]
1031 if unmatched and not options.quiet:
1032 sys.stderr.write("Following patterns in " + optfilename + " did not match any fields: "
1033 + ', '.join(unmatched) + "\n")
1034 if not Globals.verbose_options:
1035 sys.stderr.write("Use protoc --nanopb-out=-v:. to see a list of the field names.\n")
1037 return {'headername': headername, 'headerdata': headerdata,
1038 'sourcename': sourcename, 'sourcedata': sourcedata}
1041 '''Main function when invoked directly from the command line.'''
1043 options, filenames = optparser.parse_args()
1046 optparser.print_help()
1050 options.verbose = False
1052 Globals.verbose_options = options.verbose
1054 for filename in filenames:
1055 results = process_file(filename, None, options)
1057 if not options.quiet:
1058 sys.stderr.write("Writing to " + results['headername'] + " and "
1059 + results['sourcename'] + "\n")
1061 open(results['headername'], 'w').write(results['headerdata'])
1062 open(results['sourcename'], 'w').write(results['sourcedata'])
1065 '''Main function when invoked as a protoc plugin.'''
1068 if sys.platform == "win32":
1070 # Set stdin and stdout to binary mode
1071 msvcrt.setmode(sys.stdin.fileno(), os.O_BINARY)
1072 msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
1074 data = sys.stdin.read()
1075 request = plugin_pb2.CodeGeneratorRequest.FromString(data)
1078 args = shlex.split(request.parameter)
1079 options, dummy = optparser.parse_args(args)
1081 Globals.verbose_options = options.verbose
1083 response = plugin_pb2.CodeGeneratorResponse()
1085 for filename in request.file_to_generate:
1086 for fdesc in request.proto_file:
1087 if fdesc.name == filename:
1088 results = process_file(filename, fdesc, options)
1090 f = response.file.add()
1091 f.name = results['headername']
1092 f.content = results['headerdata']
1094 f = response.file.add()
1095 f.name = results['sourcename']
1096 f.content = results['sourcedata']
1098 sys.stdout.write(response.SerializeToString())
1100 if __name__ == '__main__':
1101 # Check if we are running as a plugin under protoc
1102 if 'protoc-gen-' in sys.argv[0] or '--protoc-plugin' in sys.argv: