1 | """
|
2 | args.py - Flag, option, and arg parsing for the shell.
|
3 |
|
4 | All existing shells have their own flag parsing, rather than using libc.
|
5 |
|
6 | We have 3 types of flag parsing here:
|
7 |
|
8 | FlagSpecAndMore() -- e.g. for 'sh +u -o errexit' and 'set +u -o errexit'
|
9 | FlagSpec() -- for echo -en, read -t1.0, etc.
|
10 |
|
11 | Examples:
|
12 | set -opipefail # not allowed, space required
|
13 | read -t1.0 # allowed
|
14 |
|
15 | Things that getopt/optparse don't support:
|
16 |
|
17 | - accepts +o +n for 'set' and bin/osh
|
18 | - pushd and popd also uses +, although it's not an arg.
|
19 | - parses args -- well argparse is supposed to do this
|
20 | - maybe: integrate with usage
|
21 | - maybe: integrate with flags
|
22 |
|
23 | optparse:
|
24 | - has option groups (Go flag package has flagset)
|
25 |
|
26 | NOTES about builtins:
|
27 | - eval and echo implicitly join their args. We don't want that.
|
28 | - option strict-eval and strict-echo
|
29 | - bash is inconsistent about checking for extra args
|
30 | - exit 1 2 complains, but pushd /lib /bin just ignores second argument
|
31 | - it has a no_args() function that isn't called everywhere. It's not
|
32 | declarative.
|
33 |
|
34 | TODO:
|
35 | - Autogenerate help from help='' fields. Usage line like FlagSpec('echo [-en]')
|
36 |
|
37 | GNU notes:
|
38 |
|
39 | - Consider adding GNU-style option to interleave flags and args?
|
40 | - Not sure I like this.
|
41 | - GNU getopt has fuzzy matching for long flags. I think we should rely
|
42 | on good completion instead.
|
43 |
|
44 | Bash notes:
|
45 |
|
46 | bashgetopt.c codes:
|
47 | leading +: allow options
|
48 | : requires argument
|
49 | ; argument may be missing
|
50 | # numeric argument
|
51 |
|
52 | However I don't see these used anywhere! I only see ':' used.
|
53 | """
|
54 | from __future__ import print_function
|
55 |
|
56 | from _devbuild.gen.syntax_asdl import loc, loc_t, CompoundWord
|
57 | from _devbuild.gen.value_asdl import (value, value_e, value_t)
|
58 |
|
59 | from core.error import e_usage
|
60 | from frontend import match
|
61 | from mycpp import mops
|
62 | from mycpp.mylib import log, tagswitch, iteritems
|
63 |
|
64 | _ = log
|
65 |
|
66 | from typing import (cast, Tuple, Optional, Dict, List, Any, TYPE_CHECKING)
|
67 | if TYPE_CHECKING:
|
68 | from frontend import flag_spec
|
69 | OptChange = Tuple[str, bool]
|
70 |
|
71 | # TODO: Move to flag_spec? We use flag_type_t
|
72 | String = 1
|
73 | Int = 2
|
74 | Float = 3 # e.g. for read -t timeout value
|
75 | Bool = 4
|
76 |
|
77 |
|
78 | class _Attributes(object):
|
79 | """Object to hold flags.
|
80 |
|
81 | TODO: FlagSpec doesn't need this; only FlagSpecAndMore.
|
82 | """
|
83 |
|
84 | def __init__(self, defaults):
|
85 | # type: (Dict[str, value_t]) -> None
|
86 |
|
87 | # New style
|
88 | self.attrs = {} # type: Dict[str, value_t]
|
89 |
|
90 | self.opt_changes = [] # type: List[OptChange] # -o errexit +o nounset
|
91 | self.shopt_changes = [
|
92 | ] # type: List[OptChange] # -O nullglob +O nullglob
|
93 | self.show_options = False # 'set -o' without an argument
|
94 | self.actions = [] # type: List[str] # for compgen -A
|
95 | self.saw_double_dash = False # for set --
|
96 | for name, v in iteritems(defaults):
|
97 | self.Set(name, v)
|
98 |
|
99 | def SetTrue(self, name):
|
100 | # type: (str) -> None
|
101 | self.Set(name, value.Bool(True))
|
102 |
|
103 | def Set(self, name, val):
|
104 | # type: (str, value_t) -> None
|
105 |
|
106 | # debug-completion -> debug_completion
|
107 | name = name.replace('-', '_')
|
108 | self.attrs[name] = val
|
109 |
|
110 | if 0:
|
111 | # Backward compatibility!
|
112 | with tagswitch(val) as case:
|
113 | if case(value_e.Undef):
|
114 | py_val = None # type: Any
|
115 | elif case(value_e.Bool):
|
116 | py_val = cast(value.Bool, val).b
|
117 | elif case(value_e.Int):
|
118 | py_val = cast(value.Int, val).i
|
119 | elif case(value_e.Float):
|
120 | py_val = cast(value.Float, val).f
|
121 | elif case(value_e.Str):
|
122 | py_val = cast(value.Str, val).s
|
123 | else:
|
124 | raise AssertionError(val)
|
125 |
|
126 | setattr(self, name, py_val)
|
127 |
|
128 | def __repr__(self):
|
129 | # type: () -> str
|
130 | return '<_Attributes %s>' % self.__dict__
|
131 |
|
132 |
|
133 | class Reader(object):
|
134 | """Wrapper for argv.
|
135 |
|
136 | Modified by both the parsing loop and various actions.
|
137 |
|
138 | The caller of the flags parser can continue to use it after flag parsing is
|
139 | done to get args.
|
140 | """
|
141 |
|
142 | def __init__(self, argv, locs=None):
|
143 | # type: (List[str], Optional[List[CompoundWord]]) -> None
|
144 | self.argv = argv
|
145 | self.locs = locs
|
146 | self.n = len(argv)
|
147 | self.i = 0
|
148 |
|
149 | def __repr__(self):
|
150 | # type: () -> str
|
151 | return '<args.Reader %r %d>' % (self.argv, self.i)
|
152 |
|
153 | def Next(self):
|
154 | # type: () -> None
|
155 | """Advance."""
|
156 | self.i += 1
|
157 |
|
158 | def Peek(self):
|
159 | # type: () -> Optional[str]
|
160 | """Return the next token, or None if there are no more.
|
161 |
|
162 | None is your SENTINEL for parsing.
|
163 | """
|
164 | if self.i >= self.n:
|
165 | return None
|
166 | else:
|
167 | return self.argv[self.i]
|
168 |
|
169 | def Peek2(self):
|
170 | # type: () -> Tuple[Optional[str], loc_t]
|
171 | """Return the next token, or None if there are no more.
|
172 |
|
173 | None is your SENTINEL for parsing.
|
174 | """
|
175 | if self.i >= self.n:
|
176 | return None, loc.Missing
|
177 | else:
|
178 | return self.argv[self.i], self.locs[self.i]
|
179 |
|
180 | def ReadRequired(self, error_msg):
|
181 | # type: (str) -> str
|
182 | arg = self.Peek()
|
183 | if arg is None:
|
184 | # point at argv[0]
|
185 | e_usage(error_msg, self._FirstLocation())
|
186 | self.Next()
|
187 | return arg
|
188 |
|
189 | def ReadRequired2(self, error_msg):
|
190 | # type: (str) -> Tuple[str, loc_t]
|
191 | arg = self.Peek()
|
192 | if arg is None:
|
193 | # point at argv[0]
|
194 | e_usage(error_msg, self._FirstLocation())
|
195 | location = self.locs[self.i]
|
196 | self.Next()
|
197 | return arg, location
|
198 |
|
199 | def Rest(self):
|
200 | # type: () -> List[str]
|
201 | """Return the rest of the arguments."""
|
202 | return self.argv[self.i:]
|
203 |
|
204 | def Rest2(self):
|
205 | # type: () -> Tuple[List[str], List[CompoundWord]]
|
206 | """Return the rest of the arguments."""
|
207 | return self.argv[self.i:], self.locs[self.i:]
|
208 |
|
209 | def AtEnd(self):
|
210 | # type: () -> bool
|
211 | return self.i >= self.n # must be >= and not ==
|
212 |
|
213 | def Done(self):
|
214 | # type: () -> None
|
215 | if not self.AtEnd():
|
216 | e_usage('got too many arguments', self.Location())
|
217 |
|
218 | def _FirstLocation(self):
|
219 | # type: () -> loc_t
|
220 | if self.locs is not None and self.locs[0] is not None:
|
221 | return self.locs[0]
|
222 | else:
|
223 | return loc.Missing
|
224 |
|
225 | def Location(self):
|
226 | # type: () -> loc_t
|
227 | if self.locs is not None:
|
228 | if self.i == self.n:
|
229 | i = self.n - 1 # if the last arg is missing, point at the one before
|
230 | else:
|
231 | i = self.i
|
232 | if self.locs[i] is not None:
|
233 | return self.locs[i]
|
234 | else:
|
235 | return loc.Missing
|
236 | else:
|
237 | return loc.Missing
|
238 |
|
239 |
|
240 | class _Action(object):
|
241 | """What is done when a flag or option is detected."""
|
242 |
|
243 | def __init__(self):
|
244 | # type: () -> None
|
245 | """Empty constructor for mycpp."""
|
246 | pass
|
247 |
|
248 | def OnMatch(self, attached_arg, arg_r, out):
|
249 | # type: (Optional[str], Reader, _Attributes) -> bool
|
250 | """Called when the flag matches.
|
251 |
|
252 | Args:
|
253 | prefix: '-' or '+'
|
254 | suffix: ',' for -d,
|
255 | arg_r: Reader() (rename to Input or InputReader?)
|
256 | out: _Attributes() -- the thing we want to set
|
257 |
|
258 | Returns:
|
259 | True if flag parsing should be aborted.
|
260 | """
|
261 | raise NotImplementedError()
|
262 |
|
263 |
|
264 | class _ArgAction(_Action):
|
265 |
|
266 | def __init__(self, name, quit_parsing_flags, valid=None):
|
267 | # type: (str, bool, Optional[List[str]]) -> None
|
268 | """
|
269 | Args:
|
270 | quit_parsing_flags: Stop parsing args after this one. for sh -c.
|
271 | python -c behaves the same way.
|
272 | """
|
273 | self.name = name
|
274 | self.quit_parsing_flags = quit_parsing_flags
|
275 | self.valid = valid
|
276 |
|
277 | def _Value(self, arg, location):
|
278 | # type: (str, loc_t) -> value_t
|
279 | raise NotImplementedError()
|
280 |
|
281 | def OnMatch(self, attached_arg, arg_r, out):
|
282 | # type: (Optional[str], Reader, _Attributes) -> bool
|
283 | """Called when the flag matches."""
|
284 | if attached_arg is not None: # for the ',' in -d,
|
285 | arg = attached_arg
|
286 | else:
|
287 | arg_r.Next()
|
288 | arg = arg_r.Peek()
|
289 | if arg is None:
|
290 | e_usage('expected argument to %r' % ('-' + self.name),
|
291 | arg_r.Location())
|
292 |
|
293 | val = self._Value(arg, arg_r.Location())
|
294 | out.Set(self.name, val)
|
295 | return self.quit_parsing_flags
|
296 |
|
297 |
|
298 | class SetToInt(_ArgAction):
|
299 |
|
300 | def __init__(self, name):
|
301 | # type: (str) -> None
|
302 | # repeat defaults for C++ translation
|
303 | _ArgAction.__init__(self, name, False, valid=None)
|
304 |
|
305 | def _Value(self, arg, location):
|
306 | # type: (str, loc_t) -> value_t
|
307 | if match.LooksLikeInteger(arg):
|
308 | i = mops.FromStr(arg)
|
309 | else:
|
310 | e_usage(
|
311 | 'expected integer after %s, got %r' % ('-' + self.name, arg),
|
312 | location)
|
313 |
|
314 | # So far all our int values are > 0, so use -1 as the 'unset' value
|
315 | # corner case: this treats -0 as 0!
|
316 | if mops.Greater(mops.BigInt(0), i):
|
317 | e_usage('got invalid integer for %s: %s' % ('-' + self.name, arg),
|
318 | location)
|
319 | return value.Int(i)
|
320 |
|
321 |
|
322 | class SetToFloat(_ArgAction):
|
323 |
|
324 | def __init__(self, name):
|
325 | # type: (str) -> None
|
326 | # repeat defaults for C++ translation
|
327 | _ArgAction.__init__(self, name, False, valid=None)
|
328 |
|
329 | def _Value(self, arg, location):
|
330 | # type: (str, loc_t) -> value_t
|
331 | try:
|
332 | f = float(arg)
|
333 | except ValueError:
|
334 | e_usage(
|
335 | 'expected number after %r, got %r' % ('-' + self.name, arg),
|
336 | location)
|
337 | # So far all our float values are > 0, so use -1.0 as the 'unset' value
|
338 | # corner case: this treats -0.0 as 0.0!
|
339 | if f < 0:
|
340 | e_usage('got invalid float for %s: %s' % ('-' + self.name, arg),
|
341 | location)
|
342 | return value.Float(f)
|
343 |
|
344 |
|
345 | class SetToString(_ArgAction):
|
346 |
|
347 | def __init__(self, name, quit_parsing_flags, valid=None):
|
348 | # type: (str, bool, Optional[List[str]]) -> None
|
349 | _ArgAction.__init__(self, name, quit_parsing_flags, valid=valid)
|
350 |
|
351 | def _Value(self, arg, location):
|
352 | # type: (str, loc_t) -> value_t
|
353 | if self.valid is not None and arg not in self.valid:
|
354 | e_usage(
|
355 | 'got invalid argument %r to %r, expected one of: %s' %
|
356 | (arg, ('-' + self.name), '|'.join(self.valid)), location)
|
357 | return value.Str(arg)
|
358 |
|
359 |
|
360 | class SetAttachedBool(_Action):
|
361 |
|
362 | def __init__(self, name):
|
363 | # type: (str) -> None
|
364 | self.name = name
|
365 |
|
366 | def OnMatch(self, attached_arg, arg_r, out):
|
367 | # type: (Optional[str], Reader, _Attributes) -> bool
|
368 | """Called when the flag matches."""
|
369 |
|
370 | # TODO: Delete this part? Is this eqvuivalent to SetToTrue?
|
371 | #
|
372 | # We're not using Go-like --verbose=1, --verbose, or --verbose=0
|
373 | #
|
374 | # 'attached_arg' is also used for -t0 though, which is weird
|
375 |
|
376 | if attached_arg is not None: # '0' in --verbose=0
|
377 | if attached_arg in ('0', 'F', 'false',
|
378 | 'False'): # TODO: incorrect translation
|
379 | b = False
|
380 | elif attached_arg in ('1', 'T', 'true', 'Talse'):
|
381 | b = True
|
382 | else:
|
383 | e_usage(
|
384 | 'got invalid argument to boolean flag: %r' % attached_arg,
|
385 | loc.Missing)
|
386 | else:
|
387 | b = True
|
388 |
|
389 | out.Set(self.name, value.Bool(b))
|
390 | return False
|
391 |
|
392 |
|
393 | class SetToTrue(_Action):
|
394 |
|
395 | def __init__(self, name):
|
396 | # type: (str) -> None
|
397 | self.name = name
|
398 |
|
399 | def OnMatch(self, attached_arg, arg_r, out):
|
400 | # type: (Optional[str], Reader, _Attributes) -> bool
|
401 | """Called when the flag matches."""
|
402 | out.SetTrue(self.name)
|
403 | return False
|
404 |
|
405 |
|
406 | class SetOption(_Action):
|
407 | """Set an option to a boolean, for 'set +e'."""
|
408 |
|
409 | def __init__(self, name):
|
410 | # type: (str) -> None
|
411 | self.name = name
|
412 |
|
413 | def OnMatch(self, attached_arg, arg_r, out):
|
414 | # type: (Optional[str], Reader, _Attributes) -> bool
|
415 | """Called when the flag matches."""
|
416 | b = (attached_arg == '-')
|
417 | out.opt_changes.append((self.name, b))
|
418 | return False
|
419 |
|
420 |
|
421 | class SetNamedOption(_Action):
|
422 | """Set a named option to a boolean, for 'set +o errexit'."""
|
423 |
|
424 | def __init__(self, shopt=False):
|
425 | # type: (bool) -> None
|
426 | self.names = [] # type: List[str]
|
427 | self.shopt = shopt # is it sh -o (set) or sh -O (shopt)?
|
428 |
|
429 | def ArgName(self, name):
|
430 | # type: (str) -> None
|
431 | self.names.append(name)
|
432 |
|
433 | def OnMatch(self, attached_arg, arg_r, out):
|
434 | # type: (Optional[str], Reader, _Attributes) -> bool
|
435 | """Called when the flag matches."""
|
436 | b = (attached_arg == '-')
|
437 | #log('SetNamedOption %r %r %r', prefix, suffix, arg_r)
|
438 | arg_r.Next() # always advance
|
439 | arg = arg_r.Peek()
|
440 | if arg is None:
|
441 | # triggers on 'set -O' in addition to 'set -o' (meh OK)
|
442 | out.show_options = True
|
443 | return True # quit parsing
|
444 |
|
445 | attr_name = arg # Note: validation is done elsewhere
|
446 | if len(self.names) and attr_name not in self.names:
|
447 | e_usage('Invalid option %r' % arg, loc.Missing)
|
448 | changes = out.shopt_changes if self.shopt else out.opt_changes
|
449 | changes.append((attr_name, b))
|
450 | return False
|
451 |
|
452 |
|
453 | class SetAction(_Action):
|
454 | """For compgen -f."""
|
455 |
|
456 | def __init__(self, name):
|
457 | # type: (str) -> None
|
458 | self.name = name
|
459 |
|
460 | def OnMatch(self, attached_arg, arg_r, out):
|
461 | # type: (Optional[str], Reader, _Attributes) -> bool
|
462 | out.actions.append(self.name)
|
463 | return False
|
464 |
|
465 |
|
466 | class SetNamedAction(_Action):
|
467 | """For compgen -A file."""
|
468 |
|
469 | def __init__(self):
|
470 | # type: () -> None
|
471 | self.names = [] # type: List[str]
|
472 |
|
473 | def ArgName(self, name):
|
474 | # type: (str) -> None
|
475 | self.names.append(name)
|
476 |
|
477 | def OnMatch(self, attached_arg, arg_r, out):
|
478 | # type: (Optional[str], Reader, _Attributes) -> bool
|
479 | """Called when the flag matches."""
|
480 | arg_r.Next() # always advance
|
481 | arg = arg_r.Peek()
|
482 | if arg is None:
|
483 | e_usage('Expected argument for action', loc.Missing)
|
484 |
|
485 | attr_name = arg
|
486 | # Validate the option name against a list of valid names.
|
487 | if len(self.names) and attr_name not in self.names:
|
488 | e_usage('Invalid action name %r' % arg, loc.Missing)
|
489 | out.actions.append(attr_name)
|
490 | return False
|
491 |
|
492 |
|
493 | def Parse(spec, arg_r):
|
494 | # type: (flag_spec._FlagSpec, Reader) -> _Attributes
|
495 |
|
496 | # NOTE about -:
|
497 | # 'set -' ignores it, vs set
|
498 | # 'unset -' or 'export -' seems to treat it as a variable name
|
499 | out = _Attributes(spec.defaults)
|
500 |
|
501 | while not arg_r.AtEnd():
|
502 | arg = arg_r.Peek()
|
503 | if arg == '--':
|
504 | out.saw_double_dash = True
|
505 | arg_r.Next()
|
506 | break
|
507 |
|
508 | # Only accept -- if there are any long flags defined
|
509 | if len(spec.actions_long) and arg.startswith('--'):
|
510 | pos = arg.find('=', 2)
|
511 | if pos == -1:
|
512 | suffix = None # type: Optional[str]
|
513 | flag_name = arg[2:] # strip off --
|
514 | else:
|
515 | suffix = arg[pos + 1:]
|
516 | flag_name = arg[2:pos]
|
517 |
|
518 | action = spec.actions_long.get(flag_name)
|
519 | if action is None:
|
520 | e_usage('got invalid flag %r' % arg, arg_r.Location())
|
521 |
|
522 | action.OnMatch(suffix, arg_r, out)
|
523 | arg_r.Next()
|
524 | continue
|
525 |
|
526 | elif arg.startswith('-') and len(arg) > 1:
|
527 | n = len(arg)
|
528 | for i in xrange(1, n): # parse flag combos like -rx
|
529 | ch = arg[i]
|
530 |
|
531 | if ch == '0':
|
532 | ch = 'Z' # hack for read -0
|
533 |
|
534 | if ch in spec.plus_flags:
|
535 | out.Set(ch, value.Str('-'))
|
536 | continue
|
537 |
|
538 | if ch in spec.arity0: # e.g. read -r
|
539 | out.SetTrue(ch)
|
540 | continue
|
541 |
|
542 | if ch in spec.arity1: # e.g. read -t1.0
|
543 | action = spec.arity1[ch]
|
544 | # make sure we don't pass empty string for read -t
|
545 | attached_arg = arg[i + 1:] if i < n - 1 else None
|
546 | action.OnMatch(attached_arg, arg_r, out)
|
547 | break
|
548 |
|
549 | e_usage("doesn't accept flag %s" % ('-' + ch),
|
550 | arg_r.Location())
|
551 |
|
552 | arg_r.Next() # next arg
|
553 |
|
554 | # Only accept + if there are ANY options defined, e.g. for declare +rx.
|
555 | elif len(spec.plus_flags) and arg.startswith('+') and len(arg) > 1:
|
556 | n = len(arg)
|
557 | for i in xrange(1, n): # parse flag combos like -rx
|
558 | ch = arg[i]
|
559 | if ch in spec.plus_flags:
|
560 | out.Set(ch, value.Str('+'))
|
561 | continue
|
562 |
|
563 | e_usage("doesn't accept option %s" % ('+' + ch),
|
564 | arg_r.Location())
|
565 |
|
566 | arg_r.Next() # next arg
|
567 |
|
568 | else: # a regular arg
|
569 | break
|
570 |
|
571 | return out
|
572 |
|
573 |
|
574 | def ParseLikeEcho(spec, arg_r):
|
575 | # type: (flag_spec._FlagSpec, Reader) -> _Attributes
|
576 | """Echo is a special case. These work: echo -n echo -en.
|
577 |
|
578 | - But don't respect --
|
579 | - doesn't fail when an invalid flag is passed
|
580 | """
|
581 | out = _Attributes(spec.defaults)
|
582 |
|
583 | while not arg_r.AtEnd():
|
584 | arg = arg_r.Peek()
|
585 | chars = arg[1:]
|
586 | if arg.startswith('-') and len(chars):
|
587 | # Check if it looks like -en or not. TODO: could optimize this.
|
588 | done = False
|
589 | for c in chars:
|
590 | if c not in spec.arity0:
|
591 | done = True
|
592 | break
|
593 | if done:
|
594 | break
|
595 |
|
596 | for ch in chars:
|
597 | out.SetTrue(ch)
|
598 |
|
599 | else:
|
600 | break # Looks like an arg
|
601 |
|
602 | arg_r.Next() # next arg
|
603 |
|
604 | return out
|
605 |
|
606 |
|
607 | def ParseMore(spec, arg_r):
|
608 | # type: (flag_spec._FlagSpecAndMore, Reader) -> _Attributes
|
609 | """Return attributes and an index.
|
610 |
|
611 | Respects +, like set +eu
|
612 |
|
613 | We do NOT respect:
|
614 |
|
615 | WRONG: sh -cecho OK: sh -c echo
|
616 | WRONG: set -opipefail OK: set -o pipefail
|
617 |
|
618 | But we do accept these
|
619 |
|
620 | set -euo pipefail
|
621 | set -oeu pipefail
|
622 | set -oo pipefail errexit
|
623 | """
|
624 | out = _Attributes(spec.defaults)
|
625 |
|
626 | quit = False
|
627 | while not arg_r.AtEnd():
|
628 | arg = arg_r.Peek()
|
629 | if arg == '--':
|
630 | out.saw_double_dash = True
|
631 | arg_r.Next()
|
632 | break
|
633 |
|
634 | if arg.startswith('--'):
|
635 | action = spec.actions_long.get(arg[2:])
|
636 | if action is None:
|
637 | e_usage('got invalid flag %r' % arg, arg_r.Location())
|
638 |
|
639 | # Note: not parsing --foo=bar as attached_arg, as above
|
640 | action.OnMatch(None, arg_r, out)
|
641 | arg_r.Next()
|
642 | continue
|
643 |
|
644 | # corner case: sh +c is also accepted!
|
645 | if (arg.startswith('-') or arg.startswith('+')) and len(arg) > 1:
|
646 | # note: we're not handling sh -cecho (no space) as an argument
|
647 | # It complains about a missing argument
|
648 |
|
649 | char0 = arg[0]
|
650 |
|
651 | # TODO: set - - empty
|
652 | for ch in arg[1:]:
|
653 | #log('ch %r arg_r %s', ch, arg_r)
|
654 | action = spec.actions_short.get(ch)
|
655 | if action is None:
|
656 | e_usage('got invalid flag %r' % ('-' + ch),
|
657 | arg_r.Location())
|
658 |
|
659 | attached_arg = char0 if ch in spec.plus_flags else None
|
660 | quit = action.OnMatch(attached_arg, arg_r, out)
|
661 | arg_r.Next() # process the next flag
|
662 |
|
663 | if quit:
|
664 | break
|
665 | else:
|
666 | continue
|
667 |
|
668 | break # it's a regular arg
|
669 |
|
670 | return out
|