'''Generate header file for nanopb from a ProtoBuf FileDescriptorSet.'''
-nanopb_version = "0.2.0-dev"
+nanopb_version = "nanopb-0.2.1-dev"
try:
import google.protobuf.descriptor_pb2 as descriptor
+ import google.protobuf.text_format as text_format
except:
print
print "*************************************************************"
}
class Names:
- '''Keeps a set of nested names and formats them to C identifier.
- You can subclass this with your own implementation.
- '''
+ '''Keeps a set of nested names and formats them to C identifier.'''
def __init__(self, parts = ()):
if isinstance(parts, Names):
parts = parts.parts
self.fields = []
for f in desc.field:
- field_options = get_nanopb_suboptions(f, message_options)
+ 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))
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}'
base_name = Names()
for enum in fdesc.enum_type:
- enum_options = get_nanopb_suboptions(enum, file_options)
+ 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)
+ 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)
+ enum_options = get_nanopb_suboptions(enum, message_options, names + enum.name)
enums.append(Enum(names, enum, enum_options))
# Fix field default values where enum short names are used.
result += '_'
return result
-def generate_header(dependencies, headername, enums, messages):
+def generate_header(dependencies, headername, enums, messages, options):
'''Generate content for a header file.
Generates strings, which should be concatenated and stored to file.
'''
symbol = make_identifier(headername)
yield '#ifndef _PB_%s_\n' % symbol
yield '#define _PB_%s_\n' % symbol
- yield '#include <pb.h>\n\n'
+ yield options.libformat % ('pb.h')
+ yield '\n'
for dependency in dependencies:
noext = os.path.splitext(dependency)[0]
- yield '#include "%s.pb.h"\n' % noext
-
+ yield options.genformat % (noext + '.' + options.extension + '.h')
+ yield '\n'
+
yield '#ifdef __cplusplus\n'
yield 'extern "C" {\n'
yield '#endif\n\n'
for msg in messages:
yield msg.fields_declaration() + '\n'
+ yield '\n#ifdef __cplusplus\n'
+ yield '} /* extern "C" */\n'
+ yield '#endif\n'
+
+ # End of header
+ yield '\n#endif\n'
+
+def generate_source(headername, enums, messages):
+ '''Generate content for a source file.'''
+
+ yield '/* Automatically generated nanopb constant definitions */\n'
+ 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'
+
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)
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#ifdef __cplusplus\n'
- yield '} /* extern "C" */\n'
- yield '#endif\n'
-
- # End of header
- yield '\n#endif\n'
+ yield '\n'
-def generate_source(headername, enums, messages):
- '''Generate content for a source file.'''
+# ---------------------------------------------------------------------------
+# 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 = []
+
+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)
- yield '/* Automatically generated nanopb constant definitions */\n'
- yield '/* Generated by %s at %s. */\n\n' % (nanopb_version, time.asctime())
- yield '#include "%s"\n\n' % headername
+ # Handle options defined in a separate file
+ dotname = '.'.join(name.parts)
+ for namemask, options in Globals.separate_options:
+ if fnmatch(dotname, namemask):
+ new_options.MergeFrom(options)
- for msg in messages:
- yield msg.default_decl(False)
+ # 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")
- yield '\n\n'
+ if subdesc.options.HasExtension(ext_type):
+ ext = subdesc.options.Extensions[ext_type]
+ new_options.MergeFrom(ext)
- for msg in messages:
- yield msg.fields_definition() + '\n\n'
-
+ if Globals.verbose_options:
+ print "Options for " + dotname + ":"
+ print text_format.MessageToString(new_options)
+
+ return new_options
# ---------------------------------------------------------------------------
import sys
import os.path
from optparse import OptionParser
-import google.protobuf.text_format as text_format
optparser = OptionParser(
usage = "Usage: nanopb_generator.py [options] file.pb ...",
"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("-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,
optparser.add_option("-s", dest="settings", metavar="OPTION:VALUE", action="append", default=[],
help="Set generator option (max_size, max_count etc.).")
-def get_nanopb_suboptions(subdesc, options):
- '''Get copy of options, and merge information from subdesc.'''
- new_options = nanopb_pb2.NanoPBOptions()
- new_options.CopyFrom(options)
-
- 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)
-
- return new_options
-
def process(filenames, options):
'''Process the files given on the command line.'''
if options.quiet:
options.verbose = False
+
+ Globals.verbose_options = options.verbose
toplevel_options = nanopb_pb2.NanoPBOptions()
for s in options.settings:
data = open(filename, 'rb').read()
fdesc = descriptor.FileDescriptorSet.FromString(data)
- file_options = get_nanopb_suboptions(fdesc.file[0], toplevel_options)
+ # Check if any separate options are specified
+ optfilename = options.options_file % os.path.splitext(filename)[0]
if options.verbose:
- print "Options for " + filename + ":"
- print text_format.MessageToString(file_options)
+ print 'Reading options from ' + optfilename
+
+ if os.path.isfile(optfilename):
+ Globals.separate_options = read_options_file(open(optfilename, "rU"))
+ else:
+ Globals.separate_options = []
+ # Parse the file
+ file_options = get_nanopb_suboptions(fdesc.file[0], toplevel_options, Names([filename]))
enums, messages = parse_file(fdesc.file[0], file_options)
noext = os.path.splitext(filename)[0]
- headername = noext + '.pb.h'
- sourcename = noext + '.pb.c'
+ headername = noext + '.' + options.extension + '.h'
+ sourcename = noext + '.' + options.extension + '.c'
headerbasename = os.path.basename(headername)
if not options.quiet:
dependencies = [d for d in fdesc.file[0].dependency if d not in excludes]
header = open(headername, 'w')
- for part in generate_header(dependencies, headerbasename, enums, messages):
+ for part in generate_header(dependencies, headerbasename, enums, messages, options):
header.write(part)
source = open(sourcename, 'w')