| 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 |
|
| 109 | # similar hack to avoid C++ keyword in frontend/flag_gen.py
|
| 110 | if name == 'extern':
|
| 111 | name = 'extern_'
|
| 112 |
|
| 113 | self.attrs[name] = val
|
| 114 |
|
| 115 | if 0:
|
| 116 | # Backward compatibility!
|
| 117 | with tagswitch(val) as case:
|
| 118 | if case(value_e.Undef):
|
| 119 | py_val = None # type: Any
|
| 120 | elif case(value_e.Bool):
|
| 121 | py_val = cast(value.Bool, val).b
|
| 122 | elif case(value_e.Int):
|
| 123 | py_val = cast(value.Int, val).i
|
| 124 | elif case(value_e.Float):
|
| 125 | py_val = cast(value.Float, val).f
|
| 126 | elif case(value_e.Str):
|
| 127 | py_val = cast(value.Str, val).s
|
| 128 | else:
|
| 129 | raise AssertionError(val)
|
| 130 |
|
| 131 | setattr(self, name, py_val)
|
| 132 |
|
| 133 | def __repr__(self):
|
| 134 | # type: () -> str
|
| 135 | return '<_Attributes %s>' % self.__dict__
|
| 136 |
|
| 137 |
|
| 138 | class Reader(object):
|
| 139 | """Wrapper for argv.
|
| 140 |
|
| 141 | Modified by both the parsing loop and various actions.
|
| 142 |
|
| 143 | The caller of the flags parser can continue to use it after flag parsing is
|
| 144 | done to get args.
|
| 145 | """
|
| 146 |
|
| 147 | def __init__(self, argv, locs=None):
|
| 148 | # type: (List[str], Optional[List[CompoundWord]]) -> None
|
| 149 | self.argv = argv
|
| 150 | self.locs = locs
|
| 151 | self.n = len(argv)
|
| 152 | self.i = 0
|
| 153 |
|
| 154 | def __repr__(self):
|
| 155 | # type: () -> str
|
| 156 | return '<args.Reader %r %d>' % (self.argv, self.i)
|
| 157 |
|
| 158 | def Next(self):
|
| 159 | # type: () -> None
|
| 160 | """Advance."""
|
| 161 | self.i += 1
|
| 162 |
|
| 163 | def Peek(self):
|
| 164 | # type: () -> Optional[str]
|
| 165 | """Return the next token, or None if there are no more.
|
| 166 |
|
| 167 | None is your SENTINEL for parsing.
|
| 168 | """
|
| 169 | if self.i >= self.n:
|
| 170 | return None
|
| 171 | else:
|
| 172 | return self.argv[self.i]
|
| 173 |
|
| 174 | def Peek2(self):
|
| 175 | # type: () -> Tuple[Optional[str], loc_t]
|
| 176 | """Return the next token, or None if there are no more.
|
| 177 |
|
| 178 | None is your SENTINEL for parsing.
|
| 179 | """
|
| 180 | if self.i >= self.n:
|
| 181 | return None, loc.Missing
|
| 182 | else:
|
| 183 | return self.argv[self.i], self.locs[self.i]
|
| 184 |
|
| 185 | def ReadRequired(self, error_msg):
|
| 186 | # type: (str) -> str
|
| 187 | arg = self.Peek()
|
| 188 | if arg is None:
|
| 189 | # point at argv[0]
|
| 190 | e_usage(error_msg, self._FirstLocation())
|
| 191 | self.Next()
|
| 192 | return arg
|
| 193 |
|
| 194 | def ReadRequired2(self, error_msg):
|
| 195 | # type: (str) -> Tuple[str, loc_t]
|
| 196 | arg = self.Peek()
|
| 197 | if arg is None:
|
| 198 | # point at argv[0]
|
| 199 | e_usage(error_msg, self._FirstLocation())
|
| 200 | location = self.locs[self.i]
|
| 201 | self.Next()
|
| 202 | return arg, location
|
| 203 |
|
| 204 | def Rest(self):
|
| 205 | # type: () -> List[str]
|
| 206 | """Return the rest of the arguments."""
|
| 207 | return self.argv[self.i:]
|
| 208 |
|
| 209 | def Rest2(self):
|
| 210 | # type: () -> Tuple[List[str], List[CompoundWord]]
|
| 211 | """Return the rest of the arguments."""
|
| 212 | return self.argv[self.i:], self.locs[self.i:]
|
| 213 |
|
| 214 | def AtEnd(self):
|
| 215 | # type: () -> bool
|
| 216 | return self.i >= self.n # must be >= and not ==
|
| 217 |
|
| 218 | def Done(self):
|
| 219 | # type: () -> None
|
| 220 | if not self.AtEnd():
|
| 221 | e_usage('got too many arguments', self.Location())
|
| 222 |
|
| 223 | def _FirstLocation(self):
|
| 224 | # type: () -> loc_t
|
| 225 | if self.locs is not None and self.locs[0] is not None:
|
| 226 | return self.locs[0]
|
| 227 | else:
|
| 228 | return loc.Missing
|
| 229 |
|
| 230 | def Location(self):
|
| 231 | # type: () -> loc_t
|
| 232 | if self.locs is not None:
|
| 233 | if self.i == self.n:
|
| 234 | i = self.n - 1 # if the last arg is missing, point at the one before
|
| 235 | else:
|
| 236 | i = self.i
|
| 237 | if self.locs[i] is not None:
|
| 238 | return self.locs[i]
|
| 239 | else:
|
| 240 | return loc.Missing
|
| 241 | else:
|
| 242 | return loc.Missing
|
| 243 |
|
| 244 |
|
| 245 | class _Action(object):
|
| 246 | """What is done when a flag or option is detected."""
|
| 247 |
|
| 248 | def __init__(self):
|
| 249 | # type: () -> None
|
| 250 | """Empty constructor for mycpp."""
|
| 251 | pass
|
| 252 |
|
| 253 | def OnMatch(self, attached_arg, arg_r, out):
|
| 254 | # type: (Optional[str], Reader, _Attributes) -> bool
|
| 255 | """Called when the flag matches.
|
| 256 |
|
| 257 | Args:
|
| 258 | prefix: '-' or '+'
|
| 259 | suffix: ',' for -d,
|
| 260 | arg_r: Reader() (rename to Input or InputReader?)
|
| 261 | out: _Attributes() -- the thing we want to set
|
| 262 |
|
| 263 | Returns:
|
| 264 | True if flag parsing should be aborted.
|
| 265 | """
|
| 266 | raise NotImplementedError()
|
| 267 |
|
| 268 |
|
| 269 | class _ArgAction(_Action):
|
| 270 |
|
| 271 | def __init__(self, name, quit_parsing_flags, valid=None):
|
| 272 | # type: (str, bool, Optional[List[str]]) -> None
|
| 273 | """
|
| 274 | Args:
|
| 275 | quit_parsing_flags: Stop parsing args after this one. for sh -c.
|
| 276 | python -c behaves the same way.
|
| 277 | """
|
| 278 | self.name = name
|
| 279 | self.quit_parsing_flags = quit_parsing_flags
|
| 280 | self.valid = valid
|
| 281 |
|
| 282 | def _Value(self, arg, location):
|
| 283 | # type: (str, loc_t) -> value_t
|
| 284 | raise NotImplementedError()
|
| 285 |
|
| 286 | def OnMatch(self, attached_arg, arg_r, out):
|
| 287 | # type: (Optional[str], Reader, _Attributes) -> bool
|
| 288 | """Called when the flag matches."""
|
| 289 | if attached_arg is not None: # for the ',' in -d,
|
| 290 | arg = attached_arg
|
| 291 | else:
|
| 292 | arg_r.Next()
|
| 293 | arg = arg_r.Peek()
|
| 294 | if arg is None:
|
| 295 | e_usage('expected argument to %r' % ('-' + self.name),
|
| 296 | arg_r.Location())
|
| 297 |
|
| 298 | val = self._Value(arg, arg_r.Location())
|
| 299 | out.Set(self.name, val)
|
| 300 | return self.quit_parsing_flags
|
| 301 |
|
| 302 |
|
| 303 | class SetToInt(_ArgAction):
|
| 304 |
|
| 305 | def __init__(self, name):
|
| 306 | # type: (str) -> None
|
| 307 | # repeat defaults for C++ translation
|
| 308 | _ArgAction.__init__(self, name, False, valid=None)
|
| 309 |
|
| 310 | def _Value(self, arg, location):
|
| 311 | # type: (str, loc_t) -> value_t
|
| 312 | if match.LooksLikeInteger(arg):
|
| 313 | i = mops.FromStr(arg)
|
| 314 | else:
|
| 315 | e_usage(
|
| 316 | 'expected integer after %s, got %r' % ('-' + self.name, arg),
|
| 317 | location)
|
| 318 |
|
| 319 | # So far all our int values are > 0, so use -1 as the 'unset' value
|
| 320 | # corner case: this treats -0 as 0!
|
| 321 | if mops.Greater(mops.BigInt(0), i):
|
| 322 | e_usage('got invalid integer for %s: %s' % ('-' + self.name, arg),
|
| 323 | location)
|
| 324 | return value.Int(i)
|
| 325 |
|
| 326 |
|
| 327 | class SetToFloat(_ArgAction):
|
| 328 |
|
| 329 | def __init__(self, name):
|
| 330 | # type: (str) -> None
|
| 331 | # repeat defaults for C++ translation
|
| 332 | _ArgAction.__init__(self, name, False, valid=None)
|
| 333 |
|
| 334 | def _Value(self, arg, location):
|
| 335 | # type: (str, loc_t) -> value_t
|
| 336 | try:
|
| 337 | f = float(arg)
|
| 338 | except ValueError:
|
| 339 | e_usage(
|
| 340 | 'expected number after %r, got %r' % ('-' + self.name, arg),
|
| 341 | location)
|
| 342 | # So far all our float values are > 0, so use -1.0 as the 'unset' value
|
| 343 | # corner case: this treats -0.0 as 0.0!
|
| 344 | if f < 0:
|
| 345 | e_usage('got invalid float for %s: %s' % ('-' + self.name, arg),
|
| 346 | location)
|
| 347 | return value.Float(f)
|
| 348 |
|
| 349 |
|
| 350 | class SetToString(_ArgAction):
|
| 351 |
|
| 352 | def __init__(self, name, quit_parsing_flags, valid=None):
|
| 353 | # type: (str, bool, Optional[List[str]]) -> None
|
| 354 | _ArgAction.__init__(self, name, quit_parsing_flags, valid=valid)
|
| 355 |
|
| 356 | def _Value(self, arg, location):
|
| 357 | # type: (str, loc_t) -> value_t
|
| 358 | if self.valid is not None and arg not in self.valid:
|
| 359 | e_usage(
|
| 360 | 'got invalid argument %r to %r, expected one of: %s' %
|
| 361 | (arg, ('-' + self.name), '|'.join(self.valid)), location)
|
| 362 | return value.Str(arg)
|
| 363 |
|
| 364 |
|
| 365 | class SetAttachedBool(_Action):
|
| 366 |
|
| 367 | def __init__(self, name):
|
| 368 | # type: (str) -> None
|
| 369 | self.name = name
|
| 370 |
|
| 371 | def OnMatch(self, attached_arg, arg_r, out):
|
| 372 | # type: (Optional[str], Reader, _Attributes) -> bool
|
| 373 | """Called when the flag matches."""
|
| 374 |
|
| 375 | # TODO: Delete this part? Is this eqvuivalent to SetToTrue?
|
| 376 | #
|
| 377 | # We're not using Go-like --verbose=1, --verbose, or --verbose=0
|
| 378 | #
|
| 379 | # 'attached_arg' is also used for -t0 though, which is weird
|
| 380 |
|
| 381 | if attached_arg is not None: # '0' in --verbose=0
|
| 382 | if attached_arg in ('0', 'F', 'false',
|
| 383 | 'False'): # TODO: incorrect translation
|
| 384 | b = False
|
| 385 | elif attached_arg in ('1', 'T', 'true', 'Talse'):
|
| 386 | b = True
|
| 387 | else:
|
| 388 | e_usage(
|
| 389 | 'got invalid argument to boolean flag: %r' % attached_arg,
|
| 390 | loc.Missing)
|
| 391 | else:
|
| 392 | b = True
|
| 393 |
|
| 394 | out.Set(self.name, value.Bool(b))
|
| 395 | return False
|
| 396 |
|
| 397 |
|
| 398 | class SetToTrue(_Action):
|
| 399 |
|
| 400 | def __init__(self, name):
|
| 401 | # type: (str) -> None
|
| 402 | self.name = name
|
| 403 |
|
| 404 | def OnMatch(self, attached_arg, arg_r, out):
|
| 405 | # type: (Optional[str], Reader, _Attributes) -> bool
|
| 406 | """Called when the flag matches."""
|
| 407 | out.SetTrue(self.name)
|
| 408 | return False
|
| 409 |
|
| 410 |
|
| 411 | class SetOption(_Action):
|
| 412 | """Set an option to a boolean, for 'set +e'."""
|
| 413 |
|
| 414 | def __init__(self, name):
|
| 415 | # type: (str) -> None
|
| 416 | self.name = name
|
| 417 |
|
| 418 | def OnMatch(self, attached_arg, arg_r, out):
|
| 419 | # type: (Optional[str], Reader, _Attributes) -> bool
|
| 420 | """Called when the flag matches."""
|
| 421 | b = (attached_arg == '-')
|
| 422 | out.opt_changes.append((self.name, b))
|
| 423 | return False
|
| 424 |
|
| 425 |
|
| 426 | class SetNamedOption(_Action):
|
| 427 | """Set a named option to a boolean, for 'set +o errexit'."""
|
| 428 |
|
| 429 | def __init__(self, shopt=False):
|
| 430 | # type: (bool) -> None
|
| 431 | self.names = [] # type: List[str]
|
| 432 | self.shopt = shopt # is it sh -o (set) or sh -O (shopt)?
|
| 433 |
|
| 434 | def ArgName(self, name):
|
| 435 | # type: (str) -> None
|
| 436 | self.names.append(name)
|
| 437 |
|
| 438 | def OnMatch(self, attached_arg, arg_r, out):
|
| 439 | # type: (Optional[str], Reader, _Attributes) -> bool
|
| 440 | """Called when the flag matches."""
|
| 441 | b = (attached_arg == '-')
|
| 442 | #log('SetNamedOption %r %r %r', prefix, suffix, arg_r)
|
| 443 | arg_r.Next() # always advance
|
| 444 | arg = arg_r.Peek()
|
| 445 | if arg is None:
|
| 446 | # triggers on 'set -O' in addition to 'set -o' (meh OK)
|
| 447 | out.show_options = True
|
| 448 | return True # quit parsing
|
| 449 |
|
| 450 | attr_name = arg # Note: validation is done elsewhere
|
| 451 | if len(self.names) and attr_name not in self.names:
|
| 452 | e_usage('Invalid option %r' % arg, loc.Missing)
|
| 453 | changes = out.shopt_changes if self.shopt else out.opt_changes
|
| 454 | changes.append((attr_name, b))
|
| 455 | return False
|
| 456 |
|
| 457 |
|
| 458 | class SetAction(_Action):
|
| 459 | """For compgen -f."""
|
| 460 |
|
| 461 | def __init__(self, name):
|
| 462 | # type: (str) -> None
|
| 463 | self.name = name
|
| 464 |
|
| 465 | def OnMatch(self, attached_arg, arg_r, out):
|
| 466 | # type: (Optional[str], Reader, _Attributes) -> bool
|
| 467 | out.actions.append(self.name)
|
| 468 | return False
|
| 469 |
|
| 470 |
|
| 471 | class SetNamedAction(_Action):
|
| 472 | """For compgen -A file."""
|
| 473 |
|
| 474 | def __init__(self):
|
| 475 | # type: () -> None
|
| 476 | self.names = [] # type: List[str]
|
| 477 |
|
| 478 | def ArgName(self, name):
|
| 479 | # type: (str) -> None
|
| 480 | self.names.append(name)
|
| 481 |
|
| 482 | def OnMatch(self, attached_arg, arg_r, out):
|
| 483 | # type: (Optional[str], Reader, _Attributes) -> bool
|
| 484 | """Called when the flag matches."""
|
| 485 | arg_r.Next() # always advance
|
| 486 | arg = arg_r.Peek()
|
| 487 | if arg is None:
|
| 488 | e_usage('Expected argument for action', loc.Missing)
|
| 489 |
|
| 490 | attr_name = arg
|
| 491 | # Validate the option name against a list of valid names.
|
| 492 | if len(self.names) and attr_name not in self.names:
|
| 493 | e_usage('Invalid action name %r' % arg, loc.Missing)
|
| 494 | out.actions.append(attr_name)
|
| 495 | return False
|
| 496 |
|
| 497 |
|
| 498 | def Parse(spec, arg_r):
|
| 499 | # type: (flag_spec._FlagSpec, Reader) -> _Attributes
|
| 500 |
|
| 501 | # NOTE about -:
|
| 502 | # 'set -' ignores it, vs set
|
| 503 | # 'unset -' or 'export -' seems to treat it as a variable name
|
| 504 | out = _Attributes(spec.defaults)
|
| 505 |
|
| 506 | while not arg_r.AtEnd():
|
| 507 | arg = arg_r.Peek()
|
| 508 | if arg == '--':
|
| 509 | out.saw_double_dash = True
|
| 510 | arg_r.Next()
|
| 511 | break
|
| 512 |
|
| 513 | # Only accept -- if there are any long flags defined
|
| 514 | if len(spec.actions_long) and arg.startswith('--'):
|
| 515 | pos = arg.find('=', 2)
|
| 516 | if pos == -1:
|
| 517 | suffix = None # type: Optional[str]
|
| 518 | flag_name = arg[2:] # strip off --
|
| 519 | else:
|
| 520 | suffix = arg[pos + 1:]
|
| 521 | flag_name = arg[2:pos]
|
| 522 |
|
| 523 | action = spec.actions_long.get(flag_name)
|
| 524 | if action is None:
|
| 525 | e_usage('got invalid flag %r' % arg, arg_r.Location())
|
| 526 |
|
| 527 | action.OnMatch(suffix, arg_r, out)
|
| 528 | arg_r.Next()
|
| 529 | continue
|
| 530 |
|
| 531 | elif arg.startswith('-') and len(arg) > 1:
|
| 532 | n = len(arg)
|
| 533 | for i in xrange(1, n): # parse flag combos like -rx
|
| 534 | ch = arg[i]
|
| 535 |
|
| 536 | if ch == '0':
|
| 537 | ch = 'Z' # hack for read -0
|
| 538 |
|
| 539 | if ch in spec.plus_flags:
|
| 540 | out.Set(ch, value.Str('-'))
|
| 541 | continue
|
| 542 |
|
| 543 | if ch in spec.arity0: # e.g. read -r
|
| 544 | out.SetTrue(ch)
|
| 545 | continue
|
| 546 |
|
| 547 | if ch in spec.arity1: # e.g. read -t1.0
|
| 548 | action = spec.arity1[ch]
|
| 549 | # make sure we don't pass empty string for read -t
|
| 550 | attached_arg = arg[i + 1:] if i < n - 1 else None
|
| 551 | action.OnMatch(attached_arg, arg_r, out)
|
| 552 | break
|
| 553 |
|
| 554 | e_usage("doesn't accept flag %s" % ('-' + ch),
|
| 555 | arg_r.Location())
|
| 556 |
|
| 557 | arg_r.Next() # next arg
|
| 558 |
|
| 559 | # Only accept + if there are ANY options defined, e.g. for declare +rx.
|
| 560 | elif len(spec.plus_flags) and arg.startswith('+') and len(arg) > 1:
|
| 561 | n = len(arg)
|
| 562 | for i in xrange(1, n): # parse flag combos like -rx
|
| 563 | ch = arg[i]
|
| 564 | if ch in spec.plus_flags:
|
| 565 | out.Set(ch, value.Str('+'))
|
| 566 | continue
|
| 567 |
|
| 568 | e_usage("doesn't accept option %s" % ('+' + ch),
|
| 569 | arg_r.Location())
|
| 570 |
|
| 571 | arg_r.Next() # next arg
|
| 572 |
|
| 573 | else: # a regular arg
|
| 574 | break
|
| 575 |
|
| 576 | return out
|
| 577 |
|
| 578 |
|
| 579 | def ParseLikeEcho(spec, arg_r):
|
| 580 | # type: (flag_spec._FlagSpec, Reader) -> _Attributes
|
| 581 | """Echo is a special case. These work: echo -n echo -en.
|
| 582 |
|
| 583 | - But don't respect --
|
| 584 | - doesn't fail when an invalid flag is passed
|
| 585 | """
|
| 586 | out = _Attributes(spec.defaults)
|
| 587 |
|
| 588 | while not arg_r.AtEnd():
|
| 589 | arg = arg_r.Peek()
|
| 590 | chars = arg[1:]
|
| 591 | if arg.startswith('-') and len(chars):
|
| 592 | # Check if it looks like -en or not. TODO: could optimize this.
|
| 593 | done = False
|
| 594 | for c in chars:
|
| 595 | if c not in spec.arity0:
|
| 596 | done = True
|
| 597 | break
|
| 598 | if done:
|
| 599 | break
|
| 600 |
|
| 601 | for ch in chars:
|
| 602 | out.SetTrue(ch)
|
| 603 |
|
| 604 | else:
|
| 605 | break # Looks like an arg
|
| 606 |
|
| 607 | arg_r.Next() # next arg
|
| 608 |
|
| 609 | return out
|
| 610 |
|
| 611 |
|
| 612 | def ParseMore(spec, arg_r):
|
| 613 | # type: (flag_spec._FlagSpecAndMore, Reader) -> _Attributes
|
| 614 | """Return attributes and an index.
|
| 615 |
|
| 616 | Respects +, like set +eu
|
| 617 |
|
| 618 | We do NOT respect:
|
| 619 |
|
| 620 | WRONG: sh -cecho OK: sh -c echo
|
| 621 | WRONG: set -opipefail OK: set -o pipefail
|
| 622 |
|
| 623 | But we do accept these
|
| 624 |
|
| 625 | set -euo pipefail
|
| 626 | set -oeu pipefail
|
| 627 | set -oo pipefail errexit
|
| 628 | """
|
| 629 | out = _Attributes(spec.defaults)
|
| 630 |
|
| 631 | quit = False
|
| 632 | while not arg_r.AtEnd():
|
| 633 | arg = arg_r.Peek()
|
| 634 | if arg == '--':
|
| 635 | out.saw_double_dash = True
|
| 636 | arg_r.Next()
|
| 637 | break
|
| 638 |
|
| 639 | if arg.startswith('--'):
|
| 640 | action = spec.actions_long.get(arg[2:])
|
| 641 | if action is None:
|
| 642 | e_usage('got invalid flag %r' % arg, arg_r.Location())
|
| 643 |
|
| 644 | # Note: not parsing --foo=bar as attached_arg, as above
|
| 645 | action.OnMatch(None, arg_r, out)
|
| 646 | arg_r.Next()
|
| 647 | continue
|
| 648 |
|
| 649 | # corner case: sh +c is also accepted!
|
| 650 | if (arg.startswith('-') or arg.startswith('+')) and len(arg) > 1:
|
| 651 | # note: we're not handling sh -cecho (no space) as an argument
|
| 652 | # It complains about a missing argument
|
| 653 |
|
| 654 | char0 = arg[0]
|
| 655 |
|
| 656 | # TODO: set - - empty
|
| 657 | for ch in arg[1:]:
|
| 658 | #log('ch %r arg_r %s', ch, arg_r)
|
| 659 | action = spec.actions_short.get(ch)
|
| 660 | if action is None:
|
| 661 | e_usage('got invalid flag %r' % ('-' + ch),
|
| 662 | arg_r.Location())
|
| 663 |
|
| 664 | attached_arg = char0 if ch in spec.plus_flags else None
|
| 665 | quit = action.OnMatch(attached_arg, arg_r, out)
|
| 666 | arg_r.Next() # process the next flag
|
| 667 |
|
| 668 | if quit:
|
| 669 | break
|
| 670 | else:
|
| 671 | continue
|
| 672 |
|
| 673 | break # it's a regular arg
|
| 674 |
|
| 675 | return out
|