-
Notifications
You must be signed in to change notification settings - Fork 204
/
sketch.py
executable file
·642 lines (524 loc) · 18.7 KB
/
sketch.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
#!/usr/bin/python
import os
import sys
import getopt
import re
import collections
# ================================================================
# o inclflds a,x,b
# o newflds '{$y:$x*$x, $z:$x/2, $n:-$z}'
# o greprecs '$x <= 2 && $y eq "zebra"'
#
# o tabular pretty-print
# o mean
# o sort
# absolute essentials:
# * RECORD-LEVEL:
# k include/exclude fields
# o new field as function of old
# o vertical pretty-print
# * STREAM-LEVEL:
# o include/exclude records
# o sort
# o summarizations: min, max, mean, count, sum, first, last
# o tabular pretty-print
# ================================================================
def usage():
print(
"Usage: %s [options] {modulator-spec} {zero or more filenames}"
% os.path.basename(sys.argv[0]),
file=sys.stderr,
)
msg = """
Options:
-R {rs} Input/output record separator
-F {fs} Input/output field separator
-P {ps} Input/output key-value-pair separator
-v {name=value} xxx needs more doc
--idkvp Input format is delimited by IRS,IFS,IPS
--odkvp Output format is delimited by IRS,IFS,IPS
--icsv Input format is delimited by IRS,IFS,IPS, with header line followed by data lines (e.g. CSV)
--ocsv Output format is delimited by IRS,IFS,IPS, with header line followed by data lines (e.g. CSV)
--inidx Input format is implicitly integer-indexed (awk-style)
--onidx Output format is implicitly integer-indexed (awk-style)
--ixtab Input format is transposed-tabular-pretty-print
--oxtab Output format is transposed-tabular-pretty-print
Modulator specs:
--cat
--tac
--cut
--cutx
--sortfields
--sortfieldsup
--sortfieldsdown
"""
print(msg, file=sys.stderr)
sys.exit(1)
# ----------------------------------------------------------------
def parse_command_line():
namespace = set_up_namespace()
rreader = None
rwriter = None
rmodulator = None
try:
optargs, non_option_args = getopt.getopt(
sys.argv[1:],
"R:F:P:v:h",
[
"help",
"idkvp",
"odkvp",
"icsv",
"ocsv",
"inidx",
"onidx",
"ixtab",
"oxtab",
"cat",
"tac",
"cut=",
"cutx=",
"sortfields",
"sortfieldsup",
"sortfieldsdown",
],
)
except getopt.GetoptError as e:
print(str(e))
usage()
sys.exit(1)
for opt, arg in optargs:
if opt == "-R":
rs = arg
namespace.put("ORS", namespace.put("IRS", rs))
elif opt == "-F":
fs = arg
namespace.put("OFS", namespace.put("IFS", fs))
elif opt == "-P":
ps = arg
namespace.put("OPS", namespace.put("IPS", ps))
elif opt == "-v":
kv = arg.split("=", 1)
namespace.put(kv[0], kv[1])
elif opt == "--idkvp":
rreader = RecordReaderDefault(
istream=sys.stdin,
namespace=namespace,
irs=namespace.get("IRS"),
ifs=namespace.get("IFS"),
ips=namespace.get("IPS"),
)
elif opt == "--odkvp":
rwriter = RecordWriterDefault(
ostream=sys.stdout,
ors=namespace.get("ORS"),
ofs=namespace.get("OFS"),
ops=namespace.get("OPS"),
)
elif opt == "--icsv":
rreader = RecordReaderHeaderFirst(
istream=sys.stdin,
namespace=namespace,
irs=namespace.get("IRS"),
ifs=namespace.get("IFS"),
)
elif opt == "--ocsv":
rwriter = RecordWriterHeaderFirst(
ostream=sys.stdout,
ors=namespace.get("ORS"),
ofs=namespace.get("OFS"),
)
elif opt == "--inidx":
rreader = RecordReaderIntegerIndexed(
istream=sys.stdin,
namespace=namespace,
irs=namespace.get("IRS"),
ifs=namespace.get("IFS"),
)
elif opt == "--onidx":
rwriter = RecordWriterIntegerIndexed(
ostream=sys.stdout,
ors=namespace.get("ORS"),
ofs=namespace.get("OFS"),
)
# elif opt == '--ixtab':
# pass
elif opt == "--oxtab":
rwriter = RecordWriterVerticallyTabulated(
ostream=sys.stdout
) # xxx args w/r/t/ RS/FS/PS?!?
elif opt == "--cat":
rmodulator = CatModulator()
elif opt == "--tac":
rmodulator = TacModulator()
elif opt == "--cut":
rmodulator = SelectFieldsModulator(arg.split(namespace.get("IFS")))
elif opt == "--cutx":
rmodulator = DeselectFieldsModulator(arg.split(namespace.get("IFS")))
elif opt == "--cutx":
rmodulator = DeselectFieldsModulator(arg.split(namespace.get("IFS")))
elif opt == "--sortfields":
rmodulator = SortFieldsInRecordModulator(True)
elif opt == "--sortfieldsup":
rmodulator = SortFieldsInRecordModulator(True)
elif opt == "--sortfieldsdown":
rmodulator = SortFieldsInRecordModulator(False)
elif opt == "--help":
usage()
else:
print('Unhandled option "%s".' % opt, file=sys.stderr)
sys.exit(1)
# xxx non_option_arg_count = len(non_option_args)
if rreader is None:
rreader = RecordReaderDefault(
istream=sys.stdin,
namespace=namespace,
irs=namespace.get("IRS"),
ifs=namespace.get("IFS"),
ips=namespace.get("IPS"),
)
if rwriter is None:
rwriter = RecordWriterDefault(
ostream=sys.stdout,
ors=namespace.get("ORS"),
ofs=namespace.get("OFS"),
ops=namespace.get("OPS"),
)
if rmodulator is None:
rmodulator = CatModulator()
return {
"namespace": namespace,
"rreader": rreader,
"rwriter": rwriter,
"rmodulator": rmodulator,
}
def main():
options = parse_command_line()
# parse ARGV:
# * --ifmt: dkvp,hdr1st,iidxed,align,xposealign
# * --ofmt: dkvp,hdr1st,iidxed,align,xposealign
# * which-control-language spec?!?
# * modulators/script ... this is the key decision area for language(s) design.
# * filenames
rreader = options["rreader"]
rmodulator = options["rmodulator"]
rwriter = options["rwriter"]
smodulator = StreamModulator()
smodulator.modulate(rreader, rmodulator, rwriter)
# ================================================================
class MillerNamespace:
def __init__(self):
self.mapping = {}
self.imapping = {}
def get(self, name):
return self.mapping[name]
def iget(self, name):
return self.imapping[name]
def put(self, name, value):
self.mapping[name] = value
return value
def iput(self, name, ivalue):
self.imapping[name] = ivalue
return ivalue
# ================================================================
class Record:
# kvs is list of pair-lists. (xxx: do tuples work too?)
def __init__(self, kvs=[]):
self.fields = collections.OrderedDict()
self.mput(kvs)
def put(self, k, v):
self.fields[k] = v
def mput(self, kvs):
for [k, v] in kvs:
self.fields[k] = v
def get(self, k):
return self.fields[k]
def has_key(self, k):
return k in self.fields.keys()
def get_field_names(self):
return self.fields.keys()
def get_pairs(self):
return self.fields.items()
def num_pairs(self):
return len(self.fields.items())
# xxx xref to record-formatter classes
def __str__(self):
return self.fields.__repr__
def __repr__(self):
return self.fields.__repr__
# ================================================================
# Each record is a sequence of fields delimited by FS, each of which is a
# key-value pair separated by PS.
class RecordReader:
def __init__(self, istream, namespace, irs, ifs, ips):
self.istream = istream
self.namespace = namespace
self.irs = irs
self.ifs = ifs
self.ips = ips
class RecordReaderDefault(RecordReader):
def __init__(self, istream, namespace, irs, ifs, ips):
RecordReader.__init__(self, istream, namespace, irs, ifs, ips)
def read(self):
line = self.istream.readline() # xxx use self.irs
if line == "":
return None
line = (
line.strip()
) # Remove leading/trailing whitespace including carriage return from readline().
fields = line.split(self.ifs)
kvs = [field.split(self.ips, 1) for field in fields]
record = Record(kvs)
self.namespace.iput("NF", record.num_pairs)
self.namespace.iput("NR", self.namespace.iget("NR") + 1)
# xxx stub
self.namespace.put("FILENAME", None)
self.namespace.iput("FNR", self.namespace.iget("FNR") + 1)
return record
# ----------------------------------------------------------------
# awk-style
class RecordReaderIntegerIndexed(RecordReader):
# xxx ctor with istream context?!? or independent of that?!? for cskv, no matter.
# csv reader of course needs context.
def __init__(self, istream, namespace, irs, ifs):
RecordReader.__init__(self, istream, namespace, irs, ifs, None)
def read(self):
# xxx use self.irs
line = self.istream.readline()
if line == "":
return None
line = (
line.strip()
) # Remove leading/trailing whitespace including carriage return from readline().
fields = re.split(self.ifs, line)
kvs = []
i = 1
for field in fields:
kvs.append([i, field])
i += 1
return Record(kvs)
# ----------------------------------------------------------------
# csv-style
class RecordReaderHeaderFirst(RecordReader):
def __init__(self, istream, namespace, irs, ifs):
RecordReader.__init__(self, istream, namespace, irs, ifs, None)
self.field_names = None
self.header_line = None
def read(self):
if not self.field_names:
header_line = self.istream.readline()
if header_line == "":
return None
# Remove leading/trailing whitespace including carriage return from readline().
header_line = header_line.strip()
self.field_names = header_line.split(self.ifs, -1)
self.header_line = header_line
data_line = self.istream.readline()
if data_line == "":
return None
# Remove leading/trailing whitespace including carriage return from readline().
data_line = data_line.strip()
field_values = data_line.split(self.ifs, -1)
if len(self.field_names) != len(field_values):
raise Exception(
'Header/data length mismatch: %d != %d in "%s" and "%s"'
% (
len(self.field_names),
len(field_values),
self.header_line,
data_line,
)
)
return Record(zip(self.field_names, field_values))
# ================================================================
# xxx ostream at ctor?? needs drain-at-end logic for prettyprint.
class RecordWriter:
def __init__(self, ostream, ors, ofs, ops):
self.ostream = ostream
self.ors = ors
self.ofs = ofs
self.ops = ops
class RecordWriterDefault(RecordWriter):
def __init__(self, ostream, ors, ofs, ops):
RecordWriter.__init__(self, ostream, ors, ofs, ops)
def write(self, record):
self.ostream.write(
self.ofs.join([str(k) + self.ops + str(v) for [k, v] in record.get_pairs()])
)
self.ostream.write("\n")
# ----------------------------------------------------------------
class RecordWriterHeaderFirst(RecordWriter):
def __init__(self, ostream, ors, ofs):
RecordWriter.__init__(self, ostream, ors, ofs, None)
self.field_names = None
def write(self, record):
data_string = self.ofs.join([str(v) for [k, v] in record.get_pairs()])
if self.field_names is None:
self.field_names = record.get_field_names()
header_string = self.ofs.join([str(k) for [k, v] in record.get_pairs()])
self.ostream.write(header_string)
self.ostream.write("\n")
self.ostream.write(data_string)
self.ostream.write("\n")
# ----------------------------------------------------------------
# xxx rename
class RecordWriterVerticallyTabulated(RecordWriter):
def __init__(self, ostream):
RecordWriter.__init__(self, ostream, None, None, None)
def write(self, record):
max_field_name_width = 1
field_names = record.get_field_names()
for field_name in field_names:
field_name_width = len(field_name)
if field_name_width > max_field_name_width:
max_field_name_width = field_name_width
lines = []
for field_name in field_names:
lines.append(
"%-*s %s" % (max_field_name_width, field_name, record.get(field_name))
)
self.ostream.write("\n".join(lines))
self.ostream.write("\n\n")
# ----------------------------------------------------------------
class RecordWriterIntegerIndexed:
def __init__(self, ostream, ors, ofs):
self.ostream = ostream
self.ors = ors
self.ofs = ofs
def write(self, record):
self.ostream.write(self.ofs.join([str(v) for [k, v] in record.get_pairs()]))
self.ostream.write("\n")
# ================================================================
class CatModulator:
def __init__(self):
pass
def modulate(self, record):
if record is None: # drain at end
return []
return [record]
class TacModulator:
def __init__(self):
self.records = []
def modulate(self, record):
if record is None: # drain at end
self.records.reverse()
rv = self.records
self.records = []
return rv
else:
self.records.append(record)
return []
class SelectFieldsModulator:
def __init__(self, field_names):
self.field_names = field_names
def modulate(self, record):
if record is None: # drain at end
return []
kvs = []
for field_name in self.field_names:
if record.has_key(field_name):
kvs.append((field_name, record.get(field_name)))
new_record = Record()
new_record.mput(kvs)
return [new_record]
# The field_names argument may be a list or hash-set -- as long as it supports
# the "in" operator as in "name in field_names".
# xxx to do: use a hash-set internally.
class DeselectFieldsModulator:
def __init__(self, field_names):
self.field_names = field_names
def modulate(self, record):
if record is None: # drain at end
return []
kvs = []
for field_name in record.get_field_names():
if field_name not in self.field_names:
kvs.append((field_name, record.get(field_name)))
new_record = Record()
new_record.mput(kvs)
return [new_record]
class SortFieldsInRecordModulator:
def __init__(self, do_ascending_sort=True):
self.do_ascending_sort = do_ascending_sort
def modulate(self, record):
if record is None: # drain at end
return []
kvs = []
sorted_field_names = sorted(record.get_field_names())
if not self.do_ascending_sort:
sorted_field_names.reverse() # xxx optimize
for field_name in sorted_field_names:
kvs.append((field_name, record.get(field_name)))
new_record = Record()
new_record.mput(kvs)
return [new_record]
class MeanKeeper:
def __init__(self):
self.sum = 0.0
self.count = 0
def put(self, x):
self.sum += x
self.count += 1
def get_sum(self):
return self.sum
def get_count(self):
return self.count
def get_mean(self):
# In IEEE-standard floating-point this would give NaN in the empty case.
# But Python throws an exception on divide by zero instead.
if self.count == 0:
return None
else:
return self.sum / self.count
class MeanModulator:
def __init__(self, collate_field_names, key_field_names=[]):
self.collate_field_names = collate_field_names
self.key_field_names = key_field_names
# map from key-field values to (map from collate-field names to MSCKeeper objects).
self.collate_outputs = {}
def modulate(self, record):
if record is not None: # drain at end
# xxx optimize
for value_field_name in self.collate_field_names:
if not record.has_key(value_field_name):
return []
for key_field_name in self.key_field_names:
if not record.has_key(key_field_name):
return []
collate_field_values = [
float(record.get(k)) for k in self.collate_field_names
]
key_string = ",".join([record.get(k) for k in self.key_field_names])
# xxx wip
return []
else:
# xxx stub
output_record = Record()
output_record.put("foo", "bar")
return [output_record]
# ================================================================
class StreamModulator:
def __init__(self):
pass
def modulate(self, rreader, rmodulator, rwriter):
while True:
in_record = rreader.read()
out_records = rmodulator.modulate(in_record)
for out_record in out_records:
rwriter.write(out_record)
if in_record is None:
break
# ================================================================
def set_up_namespace():
namespace = MillerNamespace()
namespace.put("ORS", namespace.put("IRS", "\n"))
namespace.put("OFS", namespace.put("IFS", ","))
namespace.put("OPS", namespace.put("IPS", "="))
# xxx CONVFMT
namespace.put("FILENAME", None)
namespace.iput("NF", None)
namespace.iput("NR", 0)
namespace.iput("FNR", 0)
return namespace
# ================================================================
main()