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#!/usr/bin/env python
#
# Never hand-hack what you can generate...
#
# This code senerate template declarations for AIS-JSON parsing from a
# declarative specification of a JSON structure - and generate those
# declarative specification from the Python format strings for
# dumping the structures
#
import sys, getopt
# Make shared field names to data types
typemap = {
# AIS fields
"raim":"boolean",
"accuracy":"boolean",
"timestamp":"string",
}
# Map C and Python-type format letters to JSON parser datatypes
fmtmap = {
"d": "integer",
"u": "uinteger",
"f": "real",
"a": "string",
}
ais_specs = (
("json_ais4", "\tAIS_HEADER,", "ais->type4",
"\"timestamp\":\"%4u:%02u:%02uT%02u:%02u:%02uZ\","\
"\"accuracy\":%s,\"lon\":%d,\"lat\":%d,"\
"\"epfd\":%u,\"raim\":%s,\"radio\":%d}\r\n"
),
)
def generate(initname, header, structname, specifier):
specifier = specifier.strip()
if specifier[-1] == "}":
specifier = specifier[:-1]
else:
print "Missing terminating }"
sys.exit(1)
print " const struct json_attr_t %s[] = {" % initname
if header:
print header
for item in specifier.split(","):
if "timestamp" in item:
(attr, itype) = ("timestamp", "string")
else:
itype = None
(attr, fmt) = item.split(":")
if attr[0] == '"':
attr = attr[1:]
if attr[-1] == '"':
attr = attr[:-1]
if attr in typemap:
itype = typemap[attr]
if fmt[-1] in fmtmap:
itype = fmtmap[fmt[-1]]
if itype == "string":
deref = ""
else:
deref = "&"
print '\t{"%s",%s%s,%s.addr.%s = %s%s.%s,' % \
(attr, " "*(12-len(attr)),itype, " "*(12-len(itype)), itype, deref, structname, attr)
leader = " " * 37
if itype == "string":
print leader + ".maxlen = sizeof(%s.%s)}," % (structname, attr)
elif itype == "boolean":
print leader + ".dflt.boolean = false},"
elif itype == "real":
print leader + ".dflt.real = 0.0},"
else:
print leader + ".dflt.%s = 0}," % itype
print """\
{NULL},
};
"""
if __name__ == '__main__':
for description in ais_specs:
generate(initname=description[0],
header=description[1],
structname=description[2],
specifier=description[3])
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