From 3959290bc77ae26772bc107128b0a4edd3930361 Mon Sep 17 00:00:00 2001 From: Petteri Aimonen Date: Sun, 31 Jul 2011 12:55:09 +0000 Subject: First version of header generator git-svn-id: https://svn.kapsi.fi/jpa/nanopb@950 e3a754e5-d11d-0410-8d38-ebb782a927b9 --- generator/nanopb_generator.py | 344 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 344 insertions(+) create mode 100644 generator/nanopb_generator.py (limited to 'generator/nanopb_generator.py') diff --git a/generator/nanopb_generator.py b/generator/nanopb_generator.py new file mode 100644 index 00000000..b182d01f --- /dev/null +++ b/generator/nanopb_generator.py @@ -0,0 +1,344 @@ +'''Generate header file for nanopb from a ProtoBuf FileDescriptorSet.''' + +import google.protobuf.descriptor_pb2 as descriptor +import nanopb_pb2 +import os.path + +# Values are tuple (c type, pb ltype) +FieldD = descriptor.FieldDescriptorProto +datatypes = { + FieldD.TYPE_BOOL: ('bool', 'PB_LTYPE_VARINT'), + FieldD.TYPE_DOUBLE: ('double', 'PB_LTYPE_FIXED'), + FieldD.TYPE_FIXED32: ('uint32_t', 'PB_LTYPE_FIXED'), + FieldD.TYPE_FIXED64: ('uint64_t', 'PB_LTYPE_FIXED'), + FieldD.TYPE_FLOAT: ('float', 'PB_LTYPE_FIXED'), + FieldD.TYPE_INT32: ('int32_t', 'PB_LTYPE_VARINT'), + FieldD.TYPE_INT64: ('int64_t', 'PB_LTYPE_VARINT'), + FieldD.TYPE_SFIXED32: ('int32_t', 'PB_LTYPE_FIXED'), + FieldD.TYPE_SFIXED64: ('int64_t', 'PB_LTYPE_FIXED'), + FieldD.TYPE_SINT32: ('int32_t', 'PB_LTYPE_SVARINT'), + FieldD.TYPE_SINT64: ('int64_t', 'PB_LTYPE_SVARINT'), + FieldD.TYPE_UINT32: ('uint32_t', 'PB_LTYPE_VARINT'), + FieldD.TYPE_UINT64: ('uint64_t', 'PB_LTYPE_VARINT') +} + +class Names: + '''Keeps a set of nested names and formats them to C identifier. + You can subclass this with your own implementation. + ''' + 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 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('.')) + +class Enum: + def __init__(self, names, desc): + '''desc is EnumDescriptorProto''' + self.names = names + desc.name + self.values = [(self.names + x.name, x.number) for x in desc.value] + + def __str__(self): + result = 'typedef enum {\n' + 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): + '''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 = "" + + # Parse nanopb-specific field options + if desc.options.HasExtension(nanopb_pb2.nanopb): + ext = desc.options.Extensions[nanopb_pb2.nanopb] + if ext.HasField("max_size"): + self.max_size = ext.max_size + if ext.HasField("max_count"): + self.max_count = ext.max_count + + if desc.HasField('default_value'): + self.default = desc.default_value + + # Decide HTYPE + # HTYPE is the high-order nibble of nanopb field description, + # defining whether value is required/optional/repeated. + is_callback = False + if desc.label == FieldD.LABEL_REQUIRED: + self.htype = 'PB_HTYPE_REQUIRED' + elif desc.label == FieldD.LABEL_OPTIONAL: + self.htype = 'PB_HTYPE_OPTIONAL' + elif desc.label == FieldD.LABEL_REPEATED: + if self.max_count is None: + is_callback = True + else: + self.htype = 'PB_HTYPE_ARRAY' + self.array_decl = '[%d]' % self.max_count + else: + raise NotImplementedError(desc.label) + + # Decide LTYPE and CTYPE + # LTYPE is the low-order nibble of nanopb field description, + # defining how to decode an individual value. + # CTYPE is the name of the c type to use in the struct. + if datatypes.has_key(desc.type): + self.ctype, self.ltype = datatypes[desc.type] + elif desc.type == FieldD.TYPE_ENUM: + self.ltype = 'PB_LTYPE_VARINT' + self.ctype = names_from_type_name(desc.type_name) + self.default = Names(self.ctype) + self.default + elif desc.type == FieldD.TYPE_STRING: + self.ltype = 'PB_LTYPE_STRING' + if self.max_size is None: + is_callback = True + else: + self.ctype = 'char' + self.array_decl += '[%d]' % self.max_size + elif desc.type == FieldD.TYPE_BYTES: + self.ltype = 'PB_LTYPE_BYTES' + if self.max_size is None: + is_callback = True + else: + self.ctype = 'PB_BYTES_ARRAY(%d)' % self.max_size + elif desc.type == FieldD.TYPE_MESSAGE: + self.ltype = 'PB_LTYPE_SUBMESSAGE' + self.ctype = names_from_type_name(desc.type_name) + else: + raise NotImplementedError(desc.type) + + if is_callback: + self.htype = 'PB_HTYPE_CALLBACK' + self.ctype = 'pb_callback_t' + self.array_decl = '' + + def __cmp__(self, other): + return cmp(self.tag, other.tag) + + def __str__(self): + if self.htype == 'PB_HTYPE_OPTIONAL': + result = ' bool has_' + self.name + ';\n' + elif self.htype == 'PB_HTYPE_ARRAY': + result = ' size_t ' + self.name + '_count;\n' + else: + result = '' + result += ' %s %s%s;' % (self.ctype, self.name, self.array_decl) + return result + + def default_decl(self): + '''Return definition for this field's default value.''' + if self.default is None: + return None + + if self.ltype == 'PB_LTYPE_STRING': + ctype = 'char' + if self.max_size is None: + array_decl = '[]' + else: + array_decl = '[%d]' % self.max_size + default = self.default.encode('string_escape') + default = default.replace('"', '\\"') + default = '"' + default + '"' + elif self.ltype == 'PB_LTYPE_BYTES': + data = self.default.decode('string_escape') + data = ['0x%02x' % ord(c) for c in data] + + if self.max_size is None: + ctype = 'PB_BYTES_ARRAY(%d)' % len(data) + else: + ctype = 'PB_BYTES_ARRAY(%d)' % self.max_size + + default = '{%d, {%s}}' % (len(data), ','.join(data)) + array_decl = '' + else: + ctype, default = self.ctype, self.default + array_decl = '' + + return 'const %s %s_default%s = %s;' % (ctype, self.struct_name + self.name, array_decl, default) + + 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 = ' {%d, ' % self.tag + result += self.htype + if self.ltype is not None: + result += ' | ' + self.ltype + result += ',\n' + + if prev_field_name is None: + result += ' offsetof(%s, %s),' % (self.struct_name, self.name) + else: + result += ' pb_delta(%s, %s, %s),' % (self.struct_name, self.name, prev_field_name) + + if self.htype == 'PB_HTYPE_OPTIONAL': + result += '\n pb_delta(%s, has_%s, %s),' % (self.struct_name, self.name, self.name) + elif self.htype == 'PB_HTYPE_ARRAY': + result += '\n pb_delta(%s, %s_count, %s),' % (self.struct_name, self.name, self.name) + else: + result += ' 0,' + + + if self.htype == 'PB_HTYPE_ARRAY': + result += '\n pb_membersize(%s, %s[0]),' % (self.struct_name, self.name) + result += ('\n pb_membersize(%s, %s) / pb_membersize(%s, %s[0]),' + % (self.struct_name, self.name, self.struct_name, self.name)) + else: + result += '\n pb_membersize(%s, %s),' % (self.struct_name, self.name) + result += ' 0,' + + if self.ltype == 'PB_LTYPE_SUBMESSAGE': + result += '\n &%s_fields}' % self.ctype + elif self.default is None or self.htype == 'PB_HTYPE_CALLBACK': + result += ' 0}' + else: + result += '\n &%s_default}' % (self.struct_name + self.name) + + return result + +class Message: + def __init__(self, names, desc): + self.name = names + self.fields = [Field(self.name, f) for f in desc.field] + self.ordered_fields = self.fields[:] + self.ordered_fields.sort() + + def __cmp__(self, other): + '''Sort messages so that submessages are declared before the message + that uses them. + ''' + if self.refers_to(other.name): + return 1 + elif other.refers_to(self.name): + return -1 + else: + return 0 + + def refers_to(self, name): + '''Returns True if this message uses the specified type as field type.''' + for field in self.fields: + if str(field.ctype) == str(name): + return True + return False + + def __str__(self): + result = 'typedef struct {\n' + result += '\n'.join([str(f) for f in self.fields]) + result += '\n} %s;' % self.name + return result + + def default_decl(self): + result = "" + for field in self.fields: + default = field.default_decl() + if default is not None: + result += default + '\n' + return result + + def pb_field_t(self): + result = 'const pb_field_t %s_fields[] = {\n' % self.name + + prev = None + for field in self.ordered_fields: + result += field.pb_field_t(prev) + result += ',\n\n' + prev = field.name + + result = result[:-3] + '\n};' + return result + +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 process_file(fdesc): + '''Takes a FileDescriptorProto and generate content for its header file. + Generates strings, which should be concatenated and stored to file. + ''' + + yield '/* Automatically generated nanopb header */\n' + yield '#include \n\n' + + enums = [] + messages = [] + + for enum in fdesc.enum_type: + enums.append(Enum(Names(), enum)) + + for names, message in iterate_messages(fdesc): + for enum in message.enum_type: + enums.append(Enum(names, enum)) + + messages.append(Message(names, message)) + + yield '/* Enum definitions */\n' + for enum in enums: + yield str(enum) + '\n\n' + + yield '/* Struct definitions */\n' + messages.sort() + for msg in messages: + yield str(msg) + '\n\n' + + yield '/* Default values for struct fields */\n' + for msg in messages: + yield msg.default_decl() + yield '\n' + + yield '/* Struct field encoding specification for nanopb */\n' + for msg in messages: + yield msg.pb_field_t() + '\n\n' + +if __name__ == '__main__': + import sys + import os.path + + if len(sys.argv) != 2: + print "Usage: " + sys.argv[0] + " file.pb" + print "where file.pb has been compiled from .proto by:" + print "protoc -ofile.pb file.proto" + print "Output fill be written to file.h" + sys.exit(1) + + data = open(sys.argv[1]).read() + fdesc = descriptor.FileDescriptorSet.FromString(data) + + destfile = os.path.splitext(sys.argv[1])[0] + '.h' + + print "Writing to " + destfile + + destfile = open(destfile, 'w') + + for part in process_file(fdesc.file[0]): + destfile.write(part) -- cgit 1.2.3-korg