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import codecs
import getopt
import sys
import time
import rdflib
from rdflib.util import guess_format
def _help():
sys.stderr.write(
"""
program.py [-f <format>] [-o <output>] [files...]
Read RDF files given on STDOUT - does something to the resulting graph
If no files are given, read from stdin
-o specifies file for output, if not given stdout is used
-f specifies parser to use, if not given it is guessed from extension
"""
)
def main(target, _help=_help, options="", stdin=True):
"""
A main function for tools that read RDF from files given on commandline
or from STDIN (if stdin parameter is true)
"""
args, files = getopt.getopt(sys.argv[1:], "hf:o:" + options)
dargs = dict(args)
if "-h" in dargs:
_help()
sys.exit(-1)
g = rdflib.Graph()
if "-f" in dargs:
f = dargs["-f"]
else:
f = None
if "-o" in dargs:
sys.stderr.write("Output to %s\n" % dargs["-o"])
out = codecs.open(dargs["-o"], "w", "utf-8")
else:
out = sys.stdout
start = time.time()
if len(files) == 0 and stdin:
sys.stderr.write("Reading from stdin as %s..." % f)
g.parse(sys.stdin, format=f)
sys.stderr.write("[done]\n")
else:
size = 0
for x in files:
if f is None:
f = guess_format(x)
start1 = time.time()
sys.stderr.write("Loading %s as %s... " % (x, f))
g.parse(x, format=f)
sys.stderr.write(
"done.\t(%d triples\t%.2f seconds)\n"
% (len(g) - size, time.time() - start1)
)
size = len(g)
sys.stderr.write(
"Loaded a total of %d triples in %.2f seconds.\n"
% (len(g), time.time() - start)
)
target(g, out, args)
|
