#!@PYTHON@ # # This file is Copyright (c) 2010 by the GPSD project # BSD terms apply: see the file COPYING in the distribution root for details. # # Never hand-hack what you can generate... # # This code generates template declarations for AIS-JSON parsing from a # declarative specification of a JSON structure - and generates those # declarative specification from the Python format strings for # dumping the structures # import sys, getopt # # Here is the information that makes it all work - attribute, type, and # defult information for all fields. We can generate either a JSON # parser template spec or the C code for the correspondong dump functio # from this information. Doing it this way guarantees consistency. # ais_specs = ( { "initname" : "json_ais1", "header": "\tAIS_HEADER,", "structname": "ais->type1", "fieldmap":( # fieldname type default ('status', 'uinteger', '0'), ('turn', 'integer', 'AIS_TURN_NOT_AVAILABLE'), ('speed', 'uinteger', 'AIS_SPEED_NOT_AVAILABLE'), ('accuracy', 'boolean', 'false'), ('lon', 'integer', 'AIS_LON_NOT_AVAILABLE'), ('lat', 'integer', 'AIS_LAT_NOT_AVAILABLE'), ('course', 'uinteger', 'AIS_COURSE_NOT_AVAILABLE'), ('heading', 'uinteger', 'AIS_HEADING_NOT_AVAILABLE'), ('second', 'uinteger', 'AIS_SEC_NOT_AVAILABLE'), ('maneuver', 'uinteger', 'AIS_SEC_INOPERATIVE'), ('raim', 'boolean', 'false'), ('radio', 'uinteger', '0'), ), }, # Message types 2 and 3 duplicate 1 { "initname" : "json_ais4", "header": "\tAIS_HEADER,", "structname": "ais->type4", "fieldmap":( # fieldname type default ('timestamp', 'string', None), ('accuracy', 'boolean', "true"), ('lon', 'integer', "AIS_LON_NOT_AVAILABLE"), ('lat', 'integer', "AIS_LAT_NOT_AVAILABLE"), ('epfd', 'uinteger', "0"), ('raim', 'boolean', "false"), ('radio', 'uinteger', "0"), ), "stringbuffered":("timestamp",), }, { "initname" : "json_ais5", "header": "\tAIS_HEADER,", "structname": "ais->type5", "fieldmap":( # fieldname type default ('imo', 'uinteger', '0'), ('ais_version', 'uinteger', '0'), ('callsign', 'string', None), ('shipname', 'string', None), ('shiptype', 'uinteger', '0'), ('to_bow', 'uinteger', '0'), ('to_stern', 'uinteger', '0'), ('to_port', 'uinteger', '0'), ('to_starboard', 'uinteger', '0'), ('epfd', 'uinteger', '0'), ('eta', 'string', None), ('draught', 'uinteger', '0'), ('destination', 'string', None), ('dte', 'uinteger', '1'), ), "stringbuffered":("eta",), }, { "initname" : "json_ais6", "header": "\tAIS_HEADER,", "structname": "ais->type6", "fieldmap":( # fieldname type default ('seqno', 'uinteger', '0'), ('dest_mmsi', 'uinteger', '0'), ('retransmit', 'boolean', 'false'), ('dac', 'uinteger', '0'), ('fid', 'uinteger', '0'), ('data', 'string', None), ), "stringbuffered":("data",), }, { "initname" : "json_ais7", "header": "\tAIS_HEADER,", "structname": "ais->type7", "fieldmap":( # fieldname type default ('mmsi1', 'uinteger', '0'), ('mmsi2', 'uinteger', '0'), ('mmsi3', 'uinteger', '0'), ('mmsi4', 'uinteger', '0'), ), }, { "initname" : "json_ais8", "header": "\tAIS_HEADER,", "structname": "ais->type8", "fieldmap":( # fieldname type default ('dac', 'uinteger', '0'), ('fid', 'uinteger', '0'), ('data', 'string', None), ), "stringbuffered":("data",), }, { "initname" : "json_ais9", "header": "\tAIS_HEADER,", "structname": "ais->type9", "fieldmap":( # fieldname type default ('alt', 'uinteger', 'AIS_ALT_NOT_AVAILABLE'), ('speed', 'uinteger', 'AIS_SPEED_NOT_AVAILABLE'), ('accuracy', 'boolean', 'false'), ('lon', 'integer', 'AIS_LON_NOT_AVAILABLE'), ('lat', 'integer', 'AIS_LAT_NOT_AVAILABLE'), ('course', 'uinteger', 'AIS_COURSE_NOT_AVAILABLE'), ('second', 'uinteger', 'AIS_SEC_NOT_AVAILABLE'), ('regional', 'uinteger', '0'), ('dte', 'uinteger', '1'), ('raim', 'boolean', 'false'), ('radio', 'uinteger', '0'), ), }, { "initname" : "json_ais10", "header": "\tAIS_HEADER,", "structname": "ais->type10", "fieldmap":( # fieldname type default ('dest_mmsi', 'uinteger', '0'), ), }, # Message type 11 duplicates 4 { "initname" : "json_ais12", "header": "\tAIS_HEADER,", "structname": "ais->type12", "fieldmap":( # fieldname type default ('seqno', 'uinteger', '0'), ('dest_mmsi', 'uinteger', '0'), ('retransmit', 'boolean', '0'), ('text', 'string', None), ), }, # Message type 13 duplicates 7 { "initname" : "json_ais14", "header": "\tAIS_HEADER,", "structname": "ais->type14", "fieldmap":( # fieldname type default ('text', 'string', None), ), }, { "initname" : "json_ais15", "header": "\tAIS_HEADER,", "structname": "ais->type15", "fieldmap":( # fieldname type default ('mmsi1', 'uinteger', '0'), ('type1_1', 'uinteger', '0'), ('offset1_1', 'uinteger', '0'), ('type1_2', 'uinteger', '0'), ('offset1_2', 'uinteger', '0'), ('mmsi2', 'uinteger', '0'), ('type2_1', 'uinteger', '0'), ('offset2_1', 'uinteger', '0'), ), }, { "initname" : "json_ais16", "header": "\tAIS_HEADER,", "structname": "ais->type16", "fieldmap":( # fieldname type default ('mmsi1', 'uinteger', '0'), ('offset1', 'uinteger', '0'), ('increment1', 'uinteger', '0'), ('mmsi2', 'uinteger', '0'), ('offset2', 'uinteger', '0'), ('increment2', 'uinteger', '0'), ), }, { "initname" : "json_ais17", "header": "\tAIS_HEADER,", "structname": "ais->type17", "fieldmap":( # fieldname type default ('lon', 'integer', 'AIS_GNS_LON_NOT_AVAILABLE'), ('lat', 'integer', 'AIS_GNS_LAT_NOT_AVAILABLE'), ('data', 'string', None), ), "stringbuffered":("data",), }, { "initname" : "json_ais18", "header": "\tAIS_HEADER,", "structname": "ais->type18", "fieldmap":( # fieldname type default ('reserved', 'uinteger', '0'), ('speed', 'uinteger', 'AIS_SPEED_NOT_AVAILABLE'), ('accuracy', 'boolean', 'false'), ('lon', 'integer', 'AIS_LON_NOT_AVAILABLE'), ('lat', 'integer', 'AIS_LAT_NOT_AVAILABLE'), ('course', 'uinteger', 'AIS_COURSE_NOT_AVAILABLE'), ('heading', 'uinteger', 'AIS_HEADING_NOT_AVAILABLE'), ('second', 'uinteger', 'AIS_SEC_NOT_AVAILABLE'), ('regional', 'uinteger', '0'), ('cs', 'boolean', 'false'), ('display', 'boolean', 'false'), ('dsc', 'boolean', 'false'), ('band', 'boolean', 'false'), ('msg22', 'boolean', 'false'), ('raim', 'boolean', 'false'), ('radio', 'uinteger', '0'), ), }, { "initname" : "json_ais19", "header": "\tAIS_HEADER,", "structname": "ais->type19", "fieldmap":( # fieldname type default ('reserved', 'uinteger', '0'), ('speed', 'uinteger', 'AIS_SPEED_NOT_AVAILABLE'), ('accuracy', 'boolean', 'false'), ('lon', 'integer', 'AIS_LON_NOT_AVAILABLE'), ('lat', 'integer', 'AIS_LAT_NOT_AVAILABLE'), ('course', 'uinteger', 'AIS_COURSE_NOT_AVAILABLE'), ('heading', 'uinteger', 'AIS_HEADING_NOT_AVAILABLE'), ('second', 'uinteger', 'AIS_SEC_NOT_AVAILABLE'), ('regional', 'uinteger', '0'), ('shipname', 'string', None), ('shiptype', 'uinteger', '0'), ('to_bow', 'uinteger', '0'), ('to_stern', 'uinteger', '0'), ('to_port', 'uinteger', '0'), ('to_starboard', 'uinteger', '0'), ('epfd', 'uinteger', '0'), ('raim', 'boolean', 'false'), ('dte', 'uinteger', '1'), ('assigned', 'boolean', 'false'), ), }, { "initname" : "json_ais20", "header": "\tAIS_HEADER,", "structname": "ais->type20", "fieldmap":( # fieldname type default ('offset1', 'uinteger', '0'), ('number1', 'uinteger', '0'), ('timeout1', 'uinteger', '0'), ('increment1', 'uinteger', '0'), ('offset2', 'uinteger', '0'), ('number2', 'uinteger', '0'), ('timeout2', 'uinteger', '0'), ('increment2', 'uinteger', '0'), ('offset3', 'uinteger', '0'), ('number3', 'uinteger', '0'), ('timeout3', 'uinteger', '0'), ('increment3', 'uinteger', '0'), ('offset4', 'uinteger', '0'), ('number4', 'uinteger', '0'), ('timeout4', 'uinteger', '0'), ('increment4', 'uinteger', '0'), ), }, { "initname" : "json_ais21", "header": "\tAIS_HEADER,", "structname": "ais->type21", "fieldmap":( # fieldname type default ('aid_type', 'uinteger', '0'), ('name', 'string', None), ('accuracy', 'boolean', 'false'), ('lon', 'integer', 'AIS_LON_NOT_AVAILABLE'), ('lat', 'integer', 'AIS_LAT_NOT_AVAILABLE'), ('to_bow', 'uinteger', '0'), ('to_stern', 'uinteger', '0'), ('to_port', 'uinteger', '0'), ('to_starboard', 'uinteger', '0'), ('epfd', 'uinteger', '0'), ('second', 'uinteger', '0'), ('regional', 'uinteger', '0'), ('off_position', 'boolean', 'false'), ('raim', 'boolean', 'false'), ('virtual_aid', 'boolean', 'false'), ), }, { "initname" : "json_ais22", "header": "\tAIS_HEADER,", "structname": "ais->type22", "fieldmap":( # fieldname type default ('channel_a', 'uinteger', '0'), ('channel_b', 'uinteger', '0'), ('txrx', 'uinteger', '0'), ('power', 'boolean', 'false'), ('area.ne_lon', 'integer', 'AIS_GNS_LON_NOT_AVAILABLE'), ('area.ne_lat', 'integer', 'AIS_GNS_LAT_NOT_AVAILABLE'), ('area.sw_lon', 'integer', 'AIS_GNS_LON_NOT_AVAILABLE'), ('area.sw_lat', 'integer', 'AIS_GNS_LAT_NOT_AVAILABLE'), ('mmsi.dest1', 'uinteger', '0'), ('mmsi.dest2', 'uinteger', '0'), ('addressed', 'boolean', 'false'), ('band_a', 'boolean', 'false'), ('band_b', 'boolean', 'false'), ('zonesize', 'uinteger', '0'), ), }, { "initname" : "json_ais23", "header": "\tAIS_HEADER,", "structname": "ais->type23", "fieldmap":( # fieldname type default ('ne_lon', 'integer', 'AIS_GNS_LON_NOT_AVAILABLE'), ('ne_lat', 'integer', 'AIS_GNS_LAT_NOT_AVAILABLE'), ('sw_lon', 'integer', 'AIS_GNS_LON_NOT_AVAILABLE'), ('sw_lat', 'integer', 'AIS_GNS_LAT_NOT_AVAILABLE'), ('stationtype', 'uinteger', '0'), ('shiptype', 'uinteger', '0'), ('txrx', 'uinteger', '0'), ('interval', 'uinteger', '0'), ('quiet', 'uinteger', '0'), ), }, { "initname" : "json_ais24", "header": "\tAIS_HEADER,", "structname": "ais->type24", "fieldmap":( # fieldname type default ('shipname', 'string', None), # Part A ('shiptype', 'uinteger', '0'), # Part B ('vendorid', 'string', None), # Part B ('callsign', 'string', None), # Part B ('mothership_mmsi', 'uinteger', '0'), # Part B ('dim.to_bow', 'uinteger', '0'), # Part B ('dim.to_stern', 'uinteger', '0'), # Part B ('dim.to_port', 'uinteger', '0'), # Part B ('dim.to_starboard', 'uinteger', '0'), # Part B ), }, { "initname" : "json_ais25", "header": "\tAIS_HEADER,", "structname": "ais->type25", "fieldmap":( # fieldname type default ('addressed', 'boolean', 'false'), ('structured', 'boolean', 'false'), ('dest_mmsi', 'uinteger', '0'), ('app_id', 'uinteger', '0'), ('data', 'string', None), ), "stringbuffered":("data",), }, { "initname" : "json_ais26", "header": "\tAIS_HEADER,", "structname": "ais->type26", "fieldmap":( # fieldname type default ('addressed', 'boolean', 'false'), ('structured', 'boolean', 'false'), ('dest_mmsi', 'uinteger', '0'), ('app_id', 'uinteger', '0'), ('data', 'string', None), ('radio', 'uinteger', '0'), ), "stringbuffered":("data",), }, ) # Give this global the string spec you need to convert with -g # We do it this mildly odd way only because passing Python multiline # string literals on the command line is inconvenient. stringspec = "" # You should not need to modify anything below this line. def generate(spec): global outboard report = "" for (attr, itype, default) in spec["fieldmap"]: if attr in spec.get("stringbuffered", []): if attr not in outboard: report += " char %s[JSON_VAL_MAX+1];\n" % attr outboard.append(attr) report += " const struct json_attr_t %s[] = {\n" % spec["initname"] if "header" in spec: report += spec["header"] + "\n" for (attr, itype, default) in spec["fieldmap"]: structname = spec["structname"] if itype == "string": deref = "" else: deref = "&" if attr in spec.get("stringbuffered", []): target = attr else: target = structname + "." + attr if "." in attr: attr = attr[attr.rfind(".")+1:] report += '\t{"%s",%st_%s,%s.addr.%s = %s%s,\n' % \ (attr, " "*(14-len(attr)), itype, " "*(10-len(itype)), itype, deref, target) leader = " " * 39 if itype == "string": report += leader + ".len = sizeof(%s)},\n" % target else: report += leader + ".dflt.%s = %s},\n" % (itype, default) report += """\ {NULL} }; """ print report # No code for generating dump functions yet. # When we do this, remembeer that we have to suppress dump function # generation from any spec with a union dot in the field names; # those will have to be coded by hand. def string_to_specifier(strspec): "Compile a Python-style format string to an attribute-type fieldmap." # Map C and Python-type format letters to JSON parser datatypes fmtmap = { "d": "integer", "u": "uinteger", "f": "real", "s": "boolean", # Only booleans print as unquoted strings "\"": "string", } dftmap = { "integer": "0", "uinteger": "0", "real": "0.0", "string": None, "boolean": "false" } strspec = strspec.strip() if strspec[-1] == "}": strspec = strspec[:-1] else: print "Missing terminating }" sys.exit(1) print ' "fieldmap":(' for item in strspec.split(","): itype = fmtmap[item[-1]] attr = item[:item.find(":")] if attr[0] == '"': attr = attr[1:] if attr[-1] == '"': attr = attr[:-1] dflt = dftmap[itype] if dflt is not None: dflt = `dflt` print " ('%s',%s'%s',%s%s)," % (attr, " "*(14-len(attr)), itype, " "*(14-len(itype)), dflt) print " )" if __name__ == '__main__': try: # The --ais and --target= options are (required) placeho;lders. # In the future, this script will generate more different kinds # of code. (options, arguments) = getopt.getopt(sys.argv[1:], "g", ["ais", "target="]) except getopt.GetoptError, msg: print "jsongen.py: " + str(msg) raise SystemExit, 1 specify = False spec = None target = None for (switch, val) in options: if switch == '-g': specify = True elif switch == '--ais': spec = ais_specs elif switch == '--target': target = val if not specify and (not target or not spec): print "jsongen.py: must specify type and target." sys,exit(1) if specify: string_to_specifier(stringspec) else: print """/* * This is code generated by jsongen.py. Do not hand-hack it! */ /*@ -fullinitblock */ """ outboard = [] for description in spec: generate(description) print """ /*@ +fullinitblock */ /* Generated code ends. */ """ # The following sets edit modes for GNU EMACS # Local Variables: # mode:python # End: