#!/usr/bin/python '''Generate header file for nanopb from a ProtoBuf FileDescriptorSet.''' nanopb_version = "nanopb-0.2.8-dev" import sys try: # Add some dummy imports to keep packaging tools happy. import google, distutils.util # bbfreeze seems to need these import pkg_resources # pyinstaller / protobuf 2.5 seem to need these except: # Don't care, we will error out later if it is actually important. pass try: import google.protobuf.text_format as text_format import google.protobuf.descriptor_pb2 as descriptor except: sys.stderr.write(''' ************************************************************* *** Could not import the Google protobuf Python libraries *** *** Try installing package 'python-protobuf' or similar. *** ************************************************************* ''' + '\n') raise try: import proto.nanopb_pb2 as nanopb_pb2 import proto.plugin_pb2 as plugin_pb2 except: sys.stderr.write(''' ******************************************************************** *** Failed to import the protocol definitions for generator. *** *** You have to run 'make' in the nanopb/generator/proto folder. *** ******************************************************************** ''' + '\n') raise # --------------------------------------------------------------------------- # Generation of single fields # --------------------------------------------------------------------------- import time import os.path # Values are tuple (c type, pb type, encoded size) FieldD = descriptor.FieldDescriptorProto datatypes = { FieldD.TYPE_BOOL: ('bool', 'BOOL', 1), FieldD.TYPE_DOUBLE: ('double', 'DOUBLE', 8), FieldD.TYPE_FIXED32: ('uint32_t', 'FIXED32', 4), FieldD.TYPE_FIXED64: ('uint64_t', 'FIXED64', 8), FieldD.TYPE_FLOAT: ('float', 'FLOAT', 4), FieldD.TYPE_INT32: ('int32_t', 'INT32', 10), FieldD.TYPE_INT64: ('int64_t', 'INT64', 10), FieldD.TYPE_SFIXED32: ('int32_t', 'SFIXED32', 4), FieldD.TYPE_SFIXED64: ('int64_t', 'SFIXED64', 8), FieldD.TYPE_SINT32: ('int32_t', 'SINT32', 5), FieldD.TYPE_SINT64: ('int64_t', 'SINT64', 10), FieldD.TYPE_UINT32: ('uint32_t', 'UINT32', 5), FieldD.TYPE_UINT64: ('uint64_t', 'UINT64', 10) } class Names: '''Keeps a set of nested names and formats them to C identifier.''' def __init__(self, parts = ()): if isinstance(parts, Names): parts = parts.parts self.parts = tuple(parts) def __str__(self): return '_'.join(self.parts) def __add__(self, other): if isinstance(other, (str, unicode)): return Names(self.parts + (other,)) elif isinstance(other, tuple): return Names(self.parts + other) else: raise ValueError("Name parts should be of type str") def __eq__(self, other): return isinstance(other, Names) and self.parts == other.parts def names_from_type_name(type_name): '''Parse Names() from FieldDescriptorProto type_name''' if type_name[0] != '.': raise NotImplementedError("Lookup of non-absolute type names is not supported") return Names(type_name[1:].split('.')) def varint_max_size(max_value): '''Returns the maximum number of bytes a varint can take when encoded.''' for i in range(1, 11): if (max_value >> (i * 7)) == 0: return i raise ValueError("Value too large for varint: " + str(max_value)) assert varint_max_size(0) == 1 assert varint_max_size(127) == 1 assert varint_max_size(128) == 2 class EncodedSize: '''Class used to represent the encoded size of a field or a message. Consists of a combination of symbolic sizes and integer sizes.''' def __init__(self, value = 0, symbols = []): if isinstance(value, (str, Names)): symbols = [str(value)] value = 0 self.value = value self.symbols = symbols def __add__(self, other): if isinstance(other, (int, long)): return EncodedSize(self.value + other, self.symbols) elif isinstance(other, (str, Names)): return EncodedSize(self.value, self.symbols + [str(other)]) elif isinstance(other, EncodedSize): return EncodedSize(self.value + other.value, self.symbols + other.symbols) else: raise ValueError("Cannot add size: " + repr(other)) def __mul__(self, other): if isinstance(other, (int, long)): return EncodedSize(self.value * other, [str(other) + '*' + s for s in self.symbols]) else: raise ValueError("Cannot multiply size: " + repr(other)) def __str__(self): if not self.symbols: return str(self.value) else: return '(' + str(self.value) + ' + ' + ' + '.join(self.symbols) + ')' def upperlimit(self): if not self.symbols: return self.value else: return 2**32 - 1 class Enum: def __init__(self, names, desc, enum_options): '''desc is EnumDescriptorProto''' self.options = enum_options self.names = names + desc.name if enum_options.long_names: self.values = [(self.names + x.name, x.number) for x in desc.value] else: self.values = [(names + x.name, x.number) for x in desc.value] self.value_longnames = [self.names + x.name for x in desc.value] def __str__(self): result = 'typedef enum _%s {\n' % self.names result += ',\n'.join([" %s = %d" % x for x in self.values]) result += '\n} %s;' % self.names return result class Field: def __init__(self, struct_name, desc, field_options): '''desc is FieldDescriptorProto''' self.tag = desc.number self.struct_name = struct_name self.name = desc.name self.default = None self.max_size = None self.max_count = None self.array_decl = "" self.enc_size = None self.ctype = None # Parse field options if field_options.HasField("max_size"): self.max_size = field_options.max_size if field_options.HasField("max_count"): self.max_count = field_options.max_count if desc.HasField('default_value'): self.default = desc.default_value # Check field rules, i.e. required/optional/repeated. can_be_static = True if desc.label == FieldD.LABEL_REQUIRED: self.rules = 'REQUIRED' elif desc.label == FieldD.LABEL_OPTIONAL: self.rules = 'OPTIONAL' elif desc.label == FieldD.LABEL_REPEATED: self.rules = 'REPEATED' if self.max_count is None: can_be_static = False else: self.array_decl = '[%d]' % self.max_count else: raise NotImplementedError(desc.label) # Check if the field can be implemented with static allocation # i.e. whether the data size is known. if desc.type == FieldD.TYPE_STRING and self.max_size is None: can_be_static = False if desc.type == FieldD.TYPE_BYTES and self.max_size is None: can_be_static = False # Decide how the field data will be allocated if field_options.type == nanopb_pb2.FT_DEFAULT: if can_be_static: field_options.type = nanopb_pb2.FT_STATIC else: field_options.type = nanopb_pb2.FT_CALLBACK if field_options.type == nanopb_pb2.FT_STATIC and not can_be_static: raise Exception("Field %s is defined as static, but max_size or " "max_count is not given." % self.name) if field_options.type == nanopb_pb2.FT_STATIC: self.allocation = 'STATIC' elif field_options.type == nanopb_pb2.FT_POINTER: self.allocation = 'POINTER' elif field_options.type == nanopb_pb2.FT_CALLBACK: self.allocation = 'CALLBACK' else: raise NotImplementedError(field_options.type) # Decide the C data type to use in the struct. if datatypes.has_key(desc.type): self.ctype, self.pbtype, self.enc_size = datatypes[desc.type] elif desc.type == FieldD.TYPE_ENUM: self.pbtype = 'ENUM' self.ctype = names_from_type_name(desc.type_name) if self.default is not None: self.default = self.ctype + self.default self.enc_size = 5 # protoc rejects enum values > 32 bits elif desc.type == FieldD.TYPE_STRING: self.pbtype = 'STRING' self.ctype = 'char' if self.allocation == 'STATIC': self.ctype = 'char' self.array_decl += '[%d]' % self.max_size self.enc_size = varint_max_size(self.max_size) + self.max_size elif desc.type == FieldD.TYPE_BYTES: self.pbtype = 'BYTES' if self.allocation == 'STATIC': self.ctype = self.struct_name + self.name + 't' self.enc_size = varint_max_size(self.max_size) + self.max_size elif self.allocation == 'POINTER': self.ctype = 'pb_bytes_array_t' elif desc.type == FieldD.TYPE_MESSAGE: self.pbtype = 'MESSAGE' self.ctype = self.submsgname = names_from_type_name(desc.type_name) self.enc_size = None # Needs to be filled in after the message type is available else: raise NotImplementedError(desc.type) def __cmp__(self, other): return cmp(self.tag, other.tag) def __str__(self): result = '' if self.allocation == 'POINTER': if self.rules == 'REPEATED': result += ' size_t ' + self.name + '_count;\n' if self.pbtype == 'MESSAGE': # Use struct definition, so recursive submessages are possible result += ' struct _%s *%s;' % (self.ctype, self.name) elif self.rules == 'REPEATED' and self.pbtype in ['STRING', 'BYTES']: # String/bytes arrays need to be defined as pointers to pointers result += ' %s **%s;' % (self.ctype, self.name) else: result += ' %s *%s;' % (self.ctype, self.name) elif self.allocation == 'CALLBACK': result += ' pb_callback_t %s;' % self.name else: if self.rules == 'OPTIONAL' and self.allocation == 'STATIC': result += ' bool has_' + self.name + ';\n' elif self.rules == 'REPEATED' and self.allocation == 'STATIC': result += ' size_t ' + self.name + '_count;\n' result += ' %s %s%s;' % (self.ctype, self.name, self.array_decl) return result def types(self): '''Return definitions for any special types this field might need.''' if self.pbtype == 'BYTES' and self.allocation == 'STATIC': result = 'typedef struct {\n' result += ' size_t size;\n' result += ' uint8_t bytes[%d];\n' % self.max_size result += '} %s;\n' % self.ctype else: result = None return result def default_decl(self, declaration_only = False): '''Return definition for this field's default value.''' if self.default is None: return None ctype, default = self.ctype, self.default array_decl = '' if self.pbtype == 'STRING': if self.allocation != 'STATIC': return None # Not implemented array_decl = '[%d]' % self.max_size default = str(self.default).encode('string_escape') default = default.replace('"', '\\"') default = '"' + default + '"' elif self.pbtype == 'BYTES': if self.allocation != 'STATIC': return None # Not implemented data = self.default.decode('string_escape') data = ['0x%02x' % ord(c) for c in data] default = '{%d, {%s}}' % (len(data), ','.join(data)) elif self.pbtype in ['FIXED32', 'UINT32']: default += 'u' elif self.pbtype in ['FIXED64', 'UINT64']: default += 'ull' elif self.pbtype in ['SFIXED64', 'INT64']: default += 'll' if declaration_only: return 'extern const %s %s_default%s;' % (ctype, self.struct_name + self.name, array_decl) else: return 'const %s %s_default%s = %s;' % (ctype, self.struct_name + self.name, array_decl, default) def tags(self): '''Return the #define for the tag number of this field.''' identifier = '%s_%s_tag' % (self.struct_name, self.name) return '#define %-40s %d\n' % (identifier, self.tag) def pb_field_t(self, prev_field_name): '''Return the pb_field_t initializer to use in the constant array. prev_field_name is the name of the previous field or None. ''' result = ' PB_FIELD2(%3d, ' % self.tag result += '%-8s, ' % self.pbtype result += '%s, ' % self.rules result += '%-8s, ' % self.allocation result += '%s, ' % ("FIRST" if not prev_field_name else "OTHER") result += '%s, ' % self.struct_name result += '%s, ' % self.name result += '%s, ' % (prev_field_name or self.name) if self.pbtype == 'MESSAGE': result += '&%s_fields)' % self.submsgname elif self.default is None: result += '0)' elif self.pbtype in ['BYTES', 'STRING'] and self.allocation != 'STATIC': result += '0)' # Arbitrary size default values not implemented elif self.rules == 'OPTEXT': result += '0)' # Default value for extensions is not implemented else: result += '&%s_default)' % (self.struct_name + self.name) return result def largest_field_value(self): '''Determine if this field needs 16bit or 32bit pb_field_t structure to compile properly. Returns numeric value or a C-expression for assert.''' if self.pbtype == 'MESSAGE': if self.rules == 'REPEATED' and self.allocation == 'STATIC': return 'pb_membersize(%s, %s[0])' % (self.struct_name, self.name) else: return 'pb_membersize(%s, %s)' % (self.struct_name, self.name) return max(self.tag, self.max_size, self.max_count) def encoded_size(self, allmsgs): '''Return the maximum size that this field can take when encoded, including the field tag. If the size cannot be determined, returns None.''' if self.allocation != 'STATIC': return None if self.pbtype == 'MESSAGE': for msg in allmsgs: if msg.name == self.submsgname: encsize = msg.encoded_size(allmsgs) if encsize is None: return None # Submessage size is indeterminate # Include submessage length prefix encsize += varint_max_size(encsize.upperlimit()) break else: # Submessage cannot be found, this currently occurs when # the submessage type is defined in a different file. # Instead of direct numeric value, reference the size that # has been #defined in the other file. encsize = EncodedSize(self.submsgname + 'size') # We will have to make a conservative assumption on the length # prefix size, though. encsize += 5 elif self.enc_size is None: raise RuntimeError("Could not determine encoded size for %s.%s" % (self.struct_name, self.name)) else: encsize = EncodedSize(self.enc_size) encsize += varint_max_size(self.tag << 3) # Tag + wire type if self.rules == 'REPEATED': # Decoders must be always able to handle unpacked arrays. # Therefore we have to reserve space for it, even though # we emit packed arrays ourselves. encsize *= self.max_count return encsize class ExtensionRange(Field): def __init__(self, struct_name, range_start, field_options): '''Implements a special pb_extension_t* field in an extensible message structure. The range_start signifies the index at which the extensions start. Not necessarily all tags above this are extensions, it is merely a speed optimization. ''' self.tag = range_start self.struct_name = struct_name self.name = 'extensions' self.pbtype = 'EXTENSION' self.rules = 'OPTIONAL' self.allocation = 'CALLBACK' self.ctype = 'pb_extension_t' self.array_decl = '' self.default = None self.max_size = 0 self.max_count = 0 def __str__(self): return ' pb_extension_t *extensions;' def types(self): return None def tags(self): return '' def encoded_size(self, allmsgs): # We exclude extensions from the count, because they cannot be known # until runtime. Other option would be to return None here, but this # way the value remains useful if extensions are not used. return EncodedSize(0) class ExtensionField(Field): def __init__(self, struct_name, desc, field_options): self.fullname = struct_name + desc.name self.extendee_name = names_from_type_name(desc.extendee) Field.__init__(self, self.fullname + 'struct', desc, field_options) if self.rules != 'OPTIONAL': self.skip = True else: self.skip = False self.rules = 'OPTEXT' def tags(self): '''Return the #define for the tag number of this field.''' identifier = '%s_tag' % self.fullname return '#define %-40s %d\n' % (identifier, self.tag) def extension_decl(self): '''Declaration of the extension type in the .pb.h file''' if self.skip: msg = '/* Extension field %s was skipped because only "optional"\n' % self.fullname msg +=' type of extension fields is currently supported. */\n' return msg return 'extern const pb_extension_type_t %s;\n' % self.fullname def extension_def(self): '''Definition of the extension type in the .pb.c file''' if self.skip: return '' result = 'typedef struct {\n' result += str(self) result += '\n} %s;\n\n' % self.struct_name result += ('static const pb_field_t %s_field = \n %s;\n\n' % (self.fullname, self.pb_field_t(None))) result += 'const pb_extension_type_t %s = {\n' % self.fullname result += ' NULL,\n' result += ' NULL,\n' result += ' &%s_field\n' % self.fullname result += '};\n' return result # --------------------------------------------------------------------------- # Generation of messages (structures) # --------------------------------------------------------------------------- class Message: def __init__(self, names, desc, message_options): self.name = names self.fields = [] for f in desc.field: field_options = get_nanopb_suboptions(f, message_options, self.name + f.name) if field_options.type != nanopb_pb2.FT_IGNORE: self.fields.append(Field(self.name, f, field_options)) if len(desc.extension_range) > 0: field_options = get_nanopb_suboptions(desc, message_options, self.name + 'extensions') range_start = min([r.start for r in desc.extension_range]) if field_options.type != nanopb_pb2.FT_IGNORE: self.fields.append(ExtensionRange(self.name, range_start, field_options)) self.packed = message_options.packed_struct self.ordered_fields = self.fields[:] self.ordered_fields.sort() def get_dependencies(self): '''Get list of type names that this structure refers to.''' return [str(field.ctype) for field in self.fields] def __str__(self): result = 'typedef struct _%s {\n' % self.name if not self.ordered_fields: # Empty structs are not allowed in C standard. # Therefore add a dummy field if an empty message occurs. result += ' uint8_t dummy_field;' result += '\n'.join([str(f) for f in self.ordered_fields]) result += '\n}' if self.packed: result += ' pb_packed' result += ' %s;' % self.name if self.packed: result = 'PB_PACKED_STRUCT_START\n' + result result += '\nPB_PACKED_STRUCT_END' return result def types(self): result = "" for field in self.fields: types = field.types() if types is not None: result += types + '\n' return result def default_decl(self, declaration_only = False): result = "" for field in self.fields: default = field.default_decl(declaration_only) if default is not None: result += default + '\n' return result def fields_declaration(self): result = 'extern const pb_field_t %s_fields[%d];' % (self.name, len(self.fields) + 1) return result def fields_definition(self): result = 'const pb_field_t %s_fields[%d] = {\n' % (self.name, len(self.fields) + 1) prev = None for field in self.ordered_fields: result += field.pb_field_t(prev) result += ',\n' prev = field.name result += ' PB_LAST_FIELD\n};' return result def encoded_size(self, allmsgs): '''Return the maximum size that this message can take when encoded. If the size cannot be determined, returns None. ''' size = EncodedSize(0) for field in self.fields: fsize = field.encoded_size(allmsgs) if fsize is None: return None size += fsize return size # --------------------------------------------------------------------------- # Processing of entire .proto files # --------------------------------------------------------------------------- def iterate_messages(desc, names = Names()): '''Recursively find all messages. For each, yield name, DescriptorProto.''' if hasattr(desc, 'message_type'): submsgs = desc.message_type else: submsgs = desc.nested_type for submsg in submsgs: sub_names = names + submsg.name yield sub_names, submsg for x in iterate_messages(submsg, sub_names): yield x def iterate_extensions(desc, names = Names()): '''Recursively find all extensions. For each, yield name, FieldDescriptorProto. ''' for extension in desc.extension: yield names, extension for subname, subdesc in iterate_messages(desc, names): for extension in subdesc.extension: yield subname, extension def parse_file(fdesc, file_options): '''Takes a FileDescriptorProto and returns tuple (enums, messages, extensions).''' enums = [] messages = [] extensions = [] if fdesc.package: base_name = Names(fdesc.package.split('.')) else: base_name = Names() for enum in fdesc.enum_type: enum_options = get_nanopb_suboptions(enum, file_options, base_name + enum.name) enums.append(Enum(base_name, enum, enum_options)) for names, message in iterate_messages(fdesc, base_name): message_options = get_nanopb_suboptions(message, file_options, names) messages.append(Message(names, message, message_options)) for enum in message.enum_type: enum_options = get_nanopb_suboptions(enum, message_options, names + enum.name) enums.append(Enum(names, enum, enum_options)) for names, extension in iterate_extensions(fdesc, base_name): field_options = get_nanopb_suboptions(extension, file_options, names) if field_options.type != nanopb_pb2.FT_IGNORE: extensions.append(ExtensionField(names, extension, field_options)) # Fix field default values where enum short names are used. for enum in enums: if not enum.options.long_names: for message in messages: for field in message.fields: if field.default in enum.value_longnames: idx = enum.value_longnames.index(field.default) field.default = enum.values[idx][0] return enums, messages, extensions def toposort2(data): '''Topological sort. From http://code.activestate.com/recipes/577413-topological-sort/ This function is under the MIT license. ''' for k, v in data.items(): v.discard(k) # Ignore self dependencies extra_items_in_deps = reduce(set.union, data.values(), set()) - set(data.keys()) data.update(dict([(item, set()) for item in extra_items_in_deps])) while True: ordered = set(item for item,dep in data.items() if not dep) if not ordered: break for item in sorted(ordered): yield item data = dict([(item, (dep - ordered)) for item,dep in data.items() if item not in ordered]) assert not data, "A cyclic dependency exists amongst %r" % data def sort_dependencies(messages): '''Sort a list of Messages based on dependencies.''' dependencies = {} message_by_name = {} for message in messages: dependencies[str(message.name)] = set(message.get_dependencies()) message_by_name[str(message.name)] = message for msgname in toposort2(dependencies): if msgname in message_by_name: yield message_by_name[msgname] def make_identifier(headername): '''Make #ifndef identifier that contains uppercase A-Z and digits 0-9''' result = "" for c in headername.upper(): if c.isalnum(): result += c else: result += '_' return result def generate_header(dependencies, headername, enums, messages, extensions, options): '''Generate content for a header file. Generates strings, which should be concatenated and stored to file. ''' yield '/* Automatically generated nanopb header */\n' if options.notimestamp: yield '/* Generated by %s */\n\n' % (nanopb_version) else: yield '/* Generated by %s at %s. */\n\n' % (nanopb_version, time.asctime()) symbol = make_identifier(headername) yield '#ifndef _PB_%s_\n' % symbol yield '#define _PB_%s_\n' % symbol try: yield options.libformat % ('pb.h') except TypeError: # no %s specified - use whatever was passed in as options.libformat yield options.libformat yield '\n' for dependency in dependencies: noext = os.path.splitext(dependency)[0] yield options.genformat % (noext + '.' + options.extension + '.h') yield '\n' yield '#ifdef __cplusplus\n' yield 'extern "C" {\n' yield '#endif\n\n' yield '/* Enum definitions */\n' for enum in enums: yield str(enum) + '\n\n' yield '/* Struct definitions */\n' for msg in sort_dependencies(messages): yield msg.types() yield str(msg) + '\n\n' if extensions: yield '/* Extensions */\n' for extension in extensions: yield extension.extension_decl() yield '\n' yield '/* Default values for struct fields */\n' for msg in messages: yield msg.default_decl(True) yield '\n' yield '/* Field tags (for use in manual encoding/decoding) */\n' for msg in sort_dependencies(messages): for field in msg.fields: yield field.tags() for extension in extensions: yield extension.tags() yield '\n' yield '/* Struct field encoding specification for nanopb */\n' for msg in messages: yield msg.fields_declaration() + '\n' yield '\n' yield '/* Maximum encoded size of messages (where known) */\n' for msg in messages: msize = msg.encoded_size(messages) if msize is not None: identifier = '%s_size' % msg.name yield '#define %-40s %s\n' % (identifier, msize) yield '\n' yield '#ifdef __cplusplus\n' yield '} /* extern "C" */\n' yield '#endif\n' # End of header yield '\n#endif\n' def generate_source(headername, enums, messages, extensions, options): '''Generate content for a source file.''' yield '/* Automatically generated nanopb constant definitions */\n' if options.notimestamp: yield '/* Generated by %s */\n\n' % (nanopb_version) else: yield '/* Generated by %s at %s. */\n\n' % (nanopb_version, time.asctime()) yield options.genformat % (headername) yield '\n' for msg in messages: yield msg.default_decl(False) yield '\n\n' for msg in messages: yield msg.fields_definition() + '\n\n' for ext in extensions: yield ext.extension_def() + '\n' # Add checks for numeric limits if messages: count_required_fields = lambda m: len([f for f in msg.fields if f.rules == 'REQUIRED']) largest_msg = max(messages, key = count_required_fields) largest_count = count_required_fields(largest_msg) if largest_count > 64: yield '\n/* Check that missing required fields will be properly detected */\n' yield '#if PB_MAX_REQUIRED_FIELDS < %d\n' % largest_count yield '#error Properly detecting missing required fields in %s requires \\\n' % largest_msg.name yield ' setting PB_MAX_REQUIRED_FIELDS to %d or more.\n' % largest_count yield '#endif\n' worst = 0 worst_field = '' checks = [] checks_msgnames = [] for msg in messages: checks_msgnames.append(msg.name) for field in msg.fields: status = field.largest_field_value() if isinstance(status, (str, unicode)): checks.append(status) elif status > worst: worst = status worst_field = str(field.struct_name) + '.' + str(field.name) if worst > 255 or checks: yield '\n/* Check that field information fits in pb_field_t */\n' if worst > 65535 or checks: yield '#if !defined(PB_FIELD_32BIT)\n' if worst > 65535: yield '#error Field descriptor for %s is too large. Define PB_FIELD_32BIT to fix this.\n' % worst_field else: assertion = ' && '.join(str(c) + ' < 65536' for c in checks) msgs = '_'.join(str(n) for n in checks_msgnames) yield '/* If you get an error here, it means that you need to define PB_FIELD_32BIT\n' yield ' * compile-time option. You can do that in pb.h or on compiler command line.\n' yield ' * \n' yield ' * The reason you need to do this is that some of your messages contain tag\n' yield ' * numbers or field sizes that are larger than what can fit in 8 or 16 bit\n' yield ' * field descriptors.\n' yield ' */\n' yield 'STATIC_ASSERT((%s), YOU_MUST_DEFINE_PB_FIELD_32BIT_FOR_MESSAGES_%s)\n'%(assertion,msgs) yield '#endif\n\n' if worst < 65536: yield '#if !defined(PB_FIELD_16BIT) && !defined(PB_FIELD_32BIT)\n' if worst > 255: yield '#error Field descriptor for %s is too large. Define PB_FIELD_16BIT to fix this.\n' % worst_field else: assertion = ' && '.join(str(c) + ' < 256' for c in checks) msgs = '_'.join(str(n) for n in checks_msgnames) yield '/* If you get an error here, it means that you need to define PB_FIELD_16BIT\n' yield ' * compile-time option. You can do that in pb.h or on compiler command line.\n' yield ' * \n' yield ' * The reason you need to do this is that some of your messages contain tag\n' yield ' * numbers or field sizes that are larger than what can fit in the default\n' yield ' * 8 bit descriptors.\n' yield ' */\n' yield 'STATIC_ASSERT((%s), YOU_MUST_DEFINE_PB_FIELD_16BIT_FOR_MESSAGES_%s)\n'%(assertion,msgs) yield '#endif\n\n' # Add check for sizeof(double) has_double = False for msg in messages: for field in msg.fields: if field.ctype == 'double': has_double = True if has_double: yield '\n' yield '/* On some platforms (such as AVR), double is really float.\n' yield ' * These are not directly supported by nanopb, but see example_avr_double.\n' yield ' * To get rid of this error, remove any double fields from your .proto.\n' yield ' */\n' yield 'STATIC_ASSERT(sizeof(double) == 8, DOUBLE_MUST_BE_8_BYTES)\n' yield '\n' # --------------------------------------------------------------------------- # Options parsing for the .proto files # --------------------------------------------------------------------------- from fnmatch import fnmatch def read_options_file(infile): '''Parse a separate options file to list: [(namemask, options), ...] ''' results = [] for line in infile: line = line.strip() if not line or line.startswith('//') or line.startswith('#'): continue parts = line.split(None, 1) opts = nanopb_pb2.NanoPBOptions() text_format.Merge(parts[1], opts) results.append((parts[0], opts)) return results class Globals: '''Ugly global variables, should find a good way to pass these.''' verbose_options = False separate_options = [] matched_namemasks = set() def get_nanopb_suboptions(subdesc, options, name): '''Get copy of options, and merge information from subdesc.''' new_options = nanopb_pb2.NanoPBOptions() new_options.CopyFrom(options) # Handle options defined in a separate file dotname = '.'.join(name.parts) for namemask, options in Globals.separate_options: if fnmatch(dotname, namemask): Globals.matched_namemasks.add(namemask) new_options.MergeFrom(options) # Handle options defined in .proto if isinstance(subdesc.options, descriptor.FieldOptions): ext_type = nanopb_pb2.nanopb elif isinstance(subdesc.options, descriptor.FileOptions): ext_type = nanopb_pb2.nanopb_fileopt elif isinstance(subdesc.options, descriptor.MessageOptions): ext_type = nanopb_pb2.nanopb_msgopt elif isinstance(subdesc.options, descriptor.EnumOptions): ext_type = nanopb_pb2.nanopb_enumopt else: raise Exception("Unknown options type") if subdesc.options.HasExtension(ext_type): ext = subdesc.options.Extensions[ext_type] new_options.MergeFrom(ext) if Globals.verbose_options: sys.stderr.write("Options for " + dotname + ": ") sys.stderr.write(text_format.MessageToString(new_options) + "\n") return new_options # --------------------------------------------------------------------------- # Command line interface # --------------------------------------------------------------------------- import sys import os.path from optparse import OptionParser optparser = OptionParser( usage = "Usage: nanopb_generator.py [options] file.pb ...", epilog = "Compile file.pb from file.proto by: 'protoc -ofile.pb file.proto'. " + "Output will be written to file.pb.h and file.pb.c.") optparser.add_option("-x", dest="exclude", metavar="FILE", action="append", default=[], help="Exclude file from generated #include list.") optparser.add_option("-e", "--extension", dest="extension", metavar="EXTENSION", default="pb", help="Set extension to use instead of 'pb' for generated files. [default: %default]") optparser.add_option("-f", "--options-file", dest="options_file", metavar="FILE", default="%s.options", help="Set name of a separate generator options file.") optparser.add_option("-Q", "--generated-include-format", dest="genformat", metavar="FORMAT", default='#include "%s"\n', help="Set format string to use for including other .pb.h files. [default: %default]") optparser.add_option("-L", "--library-include-format", dest="libformat", metavar="FORMAT", default='#include <%s>\n', help="Set format string to use for including the nanopb pb.h header. [default: %default]") optparser.add_option("-T", "--no-timestamp", dest="notimestamp", action="store_true", default=False, help="Don't add timestamp to .pb.h and .pb.c preambles") optparser.add_option("-q", "--quiet", dest="quiet", action="store_true", default=False, help="Don't print anything except errors.") optparser.add_option("-v", "--verbose", dest="verbose", action="store_true", default=False, help="Print more information.") optparser.add_option("-s", dest="settings", metavar="OPTION:VALUE", action="append", default=[], help="Set generator option (max_size, max_count etc.).") def process_file(filename, fdesc, options): '''Process a single file. filename: The full path to the .proto or .pb source file, as string. fdesc: The loaded FileDescriptorSet, or None to read from the input file. options: Command line options as they come from OptionsParser. Returns a dict: {'headername': Name of header file, 'headerdata': Data for the .h header file, 'sourcename': Name of the source code file, 'sourcedata': Data for the .c source code file } ''' toplevel_options = nanopb_pb2.NanoPBOptions() for s in options.settings: text_format.Merge(s, toplevel_options) if not fdesc: data = open(filename, 'rb').read() fdesc = descriptor.FileDescriptorSet.FromString(data).file[0] # Check if there is a separate .options file try: optfilename = options.options_file % os.path.splitext(filename)[0] except TypeError: # No %s specified, use the filename as-is optfilename = options.options_file if os.path.isfile(optfilename): if options.verbose: sys.stderr.write('Reading options from ' + optfilename + '\n') Globals.separate_options = read_options_file(open(optfilename, "rU")) else: Globals.separate_options = [] Globals.matched_namemasks = set() # Parse the file file_options = get_nanopb_suboptions(fdesc, toplevel_options, Names([filename])) enums, messages, extensions = parse_file(fdesc, file_options) # Decide the file names noext = os.path.splitext(filename)[0] headername = noext + '.' + options.extension + '.h' sourcename = noext + '.' + options.extension + '.c' headerbasename = os.path.basename(headername) # List of .proto files that should not be included in the C header file # even if they are mentioned in the source .proto. excludes = ['nanopb.proto', 'google/protobuf/descriptor.proto'] + options.exclude dependencies = [d for d in fdesc.dependency if d not in excludes] headerdata = ''.join(generate_header(dependencies, headerbasename, enums, messages, extensions, options)) sourcedata = ''.join(generate_source(headerbasename, enums, messages, extensions, options)) # Check if there were any lines in .options that did not match a member unmatched = [n for n,o in Globals.separate_options if n not in Globals.matched_namemasks] if unmatched and not options.quiet: sys.stderr.write("Following patterns in " + optfilename + " did not match any fields: " + ', '.join(unmatched) + "\n") if not Globals.verbose_options: sys.stderr.write("Use protoc --nanopb-out=-v:. to see a list of the field names.\n") return {'headername': headername, 'headerdata': headerdata, 'sourcename': sourcename, 'sourcedata': sourcedata} def main_cli(): '''Main function when invoked directly from the command line.''' options, filenames = optparser.parse_args() if not filenames: optparser.print_help() sys.exit(1) if options.quiet: options.verbose = False Globals.verbose_options = options.verbose for filename in filenames: results = process_file(filename, None, options) if not options.quiet: sys.stderr.write("Writing to " + results['headername'] + " and " + results['sourcename'] + "\n") open(results['headername'], 'w').write(results['headerdata']) open(results['sourcename'], 'w').write(results['sourcedata']) def main_plugin(): '''Main function when invoked as a protoc plugin.''' import sys if sys.platform == "win32": import os, msvcrt # Set stdin and stdout to binary mode msvcrt.setmode(sys.stdin.fileno(), os.O_BINARY) msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY) data = sys.stdin.read() request = plugin_pb2.CodeGeneratorRequest.FromString(data) import shlex args = shlex.split(request.parameter) options, dummy = optparser.parse_args(args) Globals.verbose_options = options.verbose response = plugin_pb2.CodeGeneratorResponse() for filename in request.file_to_generate: for fdesc in request.proto_file: if fdesc.name == filename: results = process_file(filename, fdesc, options) f = response.file.add() f.name = results['headername'] f.content = results['headerdata'] f = response.file.add() f.name = results['sourcename'] f.content = results['sourcedata'] sys.stdout.write(response.SerializeToString()) if __name__ == '__main__': # Check if we are running as a plugin under protoc if 'protoc-gen-' in sys.argv[0] or '--protoc-plugin' in sys.argv: main_plugin() else: main_cli()